TPS2000B Series Digital Storage Oscilloscopes Service Manual

Transcription

1 xx ZZZ TPS2000B Series Digital Storage Oscilloscopes Service Manual *P *

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3 xx ZZZ TPS2000B Series Digital Storage Oscilloscopes Service Manual This document supports firmware version 1.00 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service

4 Copyright Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved. TEKTRONIX and TEK are registered trademarks of Tektronix, Inc. Contacting Tektronix Tektronix, Inc SW Karl Braun Drive P.O. Box 500 Beaverton, OR USA For product information, sales, service, and technical support: In North America, call Worldwide, visit to find contacts in your area.

5 Table of Contents General Safety Summary... Service Safety Summary... Preface... Products... Related Manuals... Probe Safety... v vii ix ix ix x Specifications Specifications Signal Acquisition System Time Base System Triggering System Display Batteries External DC Input External Interfaces Mechanical Characteristics Environmental Performance Operating Information Operating Information Theory of Operation Theory of Operation Acquisition Board Power Supply and Battery System Display Module Front Panel Performance Verification Performance Verification Required Equipment Test Record Self Test Self Calibration Check DC Gain Accuracy Check DC Measurement Accuracy TPS2000B Series Digital Storage Oscilloscopes Service Manual i

6 Table of Contents Check Bandwidth Check Sample Rate and Delay Time Accuracy Check Edge Trigger Sensitivity Check External Edge Trigger Sensitivity Adjustment Procedures Adjustment Procedures Required Equipment Adjustment Procedure Maintenance Diagrams Maintenance Preparation Preventing ESD Inspection and Cleaning Removal and Installation Procedures Rear Case Fan I/O Board Acquisition Board Display Adapter Board Front-Panel Knob Front Case Front-Panel Board Display Module Compact Flash Board Keypad Troubleshooting Troubleshooting Tree Lithium-Ion Battery Maintenance Repackaging Instructions Diagrams Replaceable Parts Replaceable Parts Parts Ordering Information Using the Replaceable Parts List ii TPS2000B Series Digital Storage Oscilloscopes Service Manual

7 List of Figures Figure 3-1: TPS2000B Series module-level block diagram. Remove CH3 and CH4 for a 2-channel version Figure 5-1: Adjustment setups Figure 6-1: Removing and installing the rear case Figure 6-2: Modules accessed from the rear of the oscilloscope Figure 6-3: Using a screwdriver to remove the Acquisition board Figure 6-4: Removing the BNC cover, shell, and retaining nuts Figure 6-5: Removing the front case Figure 6-6: Removing the Front-Panel module Figure 6-7: Removing the Display module Figure 6-8: Removing and installing the keypad Figure 6-9: Oscilloscope troubleshooting tree (page 1 of 4) Figure 6-10: Oscilloscope troubleshooting tree (page 2 of 4) Figure 6-11: Oscilloscope troubleshooting tree (page 3 of 4) Figure 6-12: Oscilloscope troubleshooting tree (page 4 of 4) Figure 7-1: TPS2000B Series block diagram Figure 8-1: Exploded view diagram TPS2000B Series Digital Storage Oscilloscopes Service Manual iii

8 Table of Contents List of Tables Table 1-1: Signal acquisition system Table 1-2: Time base system Table 1-3: Triggering system Table 1-4: Display Table 1-5: Batteries Table 1-6: External DC input Table 1-7: External interfaces Table 1-8: Mechanical characteristics Table 1-9: Environmental performance Table 4-1: Required equipment Table 4-2: Test record Table 5-1: Required equipment Table 5-2: Adjustments (steps are for 4-CH models only) Table 6-1: Internal inspection checklist Table 6-2: List of error codes Table 8-1: Parts list column descriptions Table 8-2: Replaceable parts list iv TPS2000B Series Digital Storage Oscilloscopes Service Manual

9 General Safety Summary General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. While using this product, you may need to access other parts of a larger system. Read the safety sections of the other component manuals for warnings and cautions related to operating the system. To Avoid Fire or Personal Injury Use proper power cord. Use only the power cord specified for this product and certified for the country of use. Connect and disconnect properly. Do not connect or disconnect probes or test leads while they are connected to a voltage source. Connect and disconnect properly. Connect the probe output to the measurement instrument before connecting the probe to the circuit under test. Connect the probe reference lead to the circuit under test before connecting the probe input. Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument. Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product. Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal. Do not operate without covers. Do not operate this product with covers or panels removed. Do not operate with suspected failures. If you suspect that there is damage to this product, have it inspected by qualified service personnel. Avoid exposed circuitry. Do not touch exposed connections and components when power is present. Replace batteries properly. Replace batteries only with the specified type and rating. Recharge batteries properly. Recharge batteries for the recommended charge cycle only. Use proper AC adapter. Use only the AC adapter specified for this product. Wear eye protection. Wear eye protection if exposure to high-intensity rays or laser radiation exists. TPS2000B Series Digital Storage Oscilloscopes Service Manual v

10 General Safety Summary Do not operate in wet/damp conditions. Do not operate in an explosive atmosphere. Keep product surfaces clean and dry. Provide proper ventilation. Refer to the manual's installation instructions for details on installing the product so it has proper ventilation. TermsinThisManual These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property. Symbols and Terms on the Product These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the marking. WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. The following symbol(s) may appear on the product: vi TPS2000B Series Digital Storage Oscilloscopes Service Manual

11 Service Safety Summary Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present. Disconnect Power. To avoid electric shock, switch off the instrument power, then disconnect the power cord from the mains power. UseCareWhenServicingWithPowerOn. Dangerousvoltagesorcurrentsmay exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components. To avoid electric shock, do not touch exposed connections. TPS2000B Series Digital Storage Oscilloscopes Service Manual vii

12 Service Safety Summary viii TPS2000B Series Digital Storage Oscilloscopes Service Manual

13 Preface This service manual for the TPS2000B Series Digital Storage Oscilloscopes provides instructions to verify the performance of, calibrate, troubleshoot, and repair the oscilloscopes to the module level. Unless noted otherwise, the term "oscilloscope" refers to all of the models in the TPS2000B Series. Products This manual covers the following products: TPS2012B Digital Storage Oscilloscope TPS2014B Digital Storage Oscilloscope TPS2024B Digital Storage Oscilloscope Related Manuals These manuals contain additional documentation for the oscilloscopes. They are available at Language User manual part number English XX French XX 1 Italian XX 1 German XX 1 Spanish XX 1 Japanese XX 1 Portuguese XX 1 Simplified Chinese XX 1 Traditional Chinese XX 1 Korean XX 1 Russian XX 1 1 These manuals contain a language overlay for the front-panel controls. Programmer manual part number XX TPS2000B Series Digital Storage Oscilloscopes Service Manual ix

14 Preface Probe Safety A guard around the probe body provides a finger barrier for protection from electric shock. WARNING. To avoid electric shock when using the probe, keep fingers behind the guard on the probe body, and do not touch metallic portions of the probe head while it is connected to a voltage source. Connect the probe output to the oscilloscope before connecting the probe to the circuit under test. Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument. x TPS2000B Series Digital Storage Oscilloscopes Service Manual

15 Specifications

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17 Specifications These specifications apply to all TPS2000B Series oscilloscopes. To verify that an oscilloscope meets specifications, it must first meet the following conditions: The oscilloscope must have been operating continuously for twenty minutes within the specified operating temperature range. (See Table 1-9.) You must perform the Do Self Cal operation, accessible through the Utility menu, if the operating temperature changes by more than 5 C. The oscilloscope must be within the factory calibration interval of one year. The V/div specifications apply with the probe calibration set to 1X probe mode. Specifications begin in the following table. All specifications are guaranteed unless noted "typical." Specifications that are marked with the symbol are checked in the Performance Verification section. Signal Acquisition System Table 1-1: Signal acquisition system Characteristic Number of Input Channels Input Coupling Input Impedance, DC Coupled Maximum Input Voltage (between Signal and Reference at input BNC) 1 Maximum Float Voltage Number of Digitized Bits Description Two (TPS2012B) or four (TPS2014B, TPS2024B) identical channels, digitized simultaneously DC, AC, or GND AC coupling connects a capacitor in series with the input circuitry. The DC input impedance becomes very high, since capacitance is in series with all paths to ground. Ground coupling mode provides a reference waveform derived from the values identified during SPC. This reference waveform shows visually where signal reference (ground) is expected to be. 1 MΩ ±2%inparallelwith20pF±3pF Overvoltage Category CAT I and CAT II Maximum Voltage 300 V RMS CAT III 150 V RMS At front panel connector, 300 V RMS ; derate at 20 db/decade above 100 khz to 13 V peak AC at 3 MHz and above. All inputs are rated 300 V CAT II, signal to floating common. Derate at 20 db/decade above 100 khz to 13 V peak AC at 3 MHz and above. For nonsinusoidal waveforms, peak value must be less than 450 V. Excursion above 300 V should be less than 100 ms duration. RMS signal level, including any DC component removed through AC coupling, must be limited to 300 V. If these values are exceeded, damage to the oscilloscope may result. Refer to the Overvoltage Category description. (See Table 1-9 on page 1-9.) Rated 600 V RMS CAT II. Between instrument common (chassis) and BNC shell. Using rated connectors or accessories. 8-bit resolution (except when set to 2 mv/div), each channel sampled simultaneously. TPS2000B Series Digital Storage Oscilloscopes Service Manual 1 1

18 Specifications Table 1-1: Signal acquisition system (cont.) Characteristic Supported Voltage Probe Attenuation Factors Supported Current Probe Scales Acquisition Modes DC Gain Accuracy DC Measurement Accuracy, Average Acquisition Mode DC Voltage Measurement Repeatability, Average Acquisition Mode Analog Bandwidth Analog Bandwidth in Sample and Average modes at BNC or with probe set to 10X, DC Coupled, typical Analog Bandwidth in Peak Detect mode (50 s/div to 5 ms/div), DC coupled, typical Lower Frequency Limit, AC Coupled Description 1X, 10X, 20X, 50X, 100X, 500X, 1000X This adjusts the display scale factor of the instrument to accommodate various probe types. Accuracy of the probe used must be added to the accuracy specifications of instrument. The Tektronix probe Interface is not provided, so the user must adjust the setting to match the probe characteristics. 1 mv/ma, 5 mv/ma, 1 mv/a, 10 mv/a, 20 mv/a, 50 mv/a, 100 mv/a, 200 mv/a This adjusts the display scale factor of the instrument to accommodate various probe types. Accuracy of the probe used must be added to the accuracy specifications of instrument. The Tektronix probe Interface is not provided, so the user must adjust the setting to match the probe characteristics. Sample, Peak Detect, and Average Envelope mode not provided ±3% for Sample or Average acquisition mode, 5 V/div to 10 mv/div ±4% for Sample or Average acquisition mode, 5 mv/div and 2 mv/div Measurement Type Average of 16 waveforms with vertical position at zero Average o f 16 waveforms with vertical position not at zero Accuracy ±(3% reading div + 1 mv) ±[3% (reading + vertical position) + 1% of vertical position div] Add 2 mv for settings from 2 mv/div to 200 mv/div Add 50 mv for settings from >200 mv/div to 5 V/div Change in measured volts between any two averages of 16 waveforms acquired under the same setup and ambient conditions. (3% of reading div) Defined in Section 4.6 of IEEE std The difference between the upper and lower frequencies, at which the amplitude response, as seen in the data record, is (-3 db) of the response seen in the data record at the specified reference frequency. Specified only 3 db point, does not include in-band response. TPS2012B and TPS2014B TPS2024B DC to 100 MHz for all V/div settings with bandwidth limit at full. DC to 75 MHz for all V/div settings with bandwidth limit at full. 10 Hz at BNC 1 Hz when using a 10X passive probe DC to 200 MHz for all V/div settings 5 mv and above, for operating temperatures from 0 C to 40 C. DC to 180 MHz for all V/div settings 5 mv/div and above, for operating temperatures from 40 C to 50 C 1 2 TPS2000B Series Digital Storage Oscilloscopes Service Manual

19 Specifications Table 1-1: Signal acquisition system (cont.) Characteristic Rise Time at BNC, typical Peak Detect Response Vertical Position Range Vertical Position Accuracy Single Channel Common Mode Rejection, typical Channel-Channel Common Mode Rejection Ratio, typical Channel-to-Channel Crosstalk Waveform acquisition Rate, typical Description TPS2012B and TPS2014B <3.5ns TPS2024B <2.1ns Rise time is generally calculated from the following formula: Rise time in ns = 350 / Bandwidth in MHz Captures 50% or greater amplitude of pulses 12 ns wide typical (50 s/div to 5 μs/div) in the center 8 vertical divisions 2 mv/div to 200 mv/div, ±1.8 V >200 mv/div to 5 V/div, ± 45 V 2 mv/div to 200 mv/div, ±(1% selected value +0.1 div + 2 mv) within the range ±1.8 V >200 mv/div to 5 V/div, ±(1% selected value +0.1 div + 50 mv) within the range ±45 V Greater than 1000:1 up to 50 MHz, derated to 400:1 at 200 MHz Sine wave with VOLTS/DIV setting at 5 mv. Signal applied between the channel (signal and signal reference) and chassis. Ratio of the acquired signal amplitude to the amplitude of the signal. 100:1 at 60 Hz, reducing to 10:1 with 50 MHz sine wave, with equal volts/div and coupling settings on each channel. With the same signal applied to each channel, this is the ratio of the acquired signal amplitude to the amplitude of the MATH difference waveform, CH1 CH2, CH2 CH1, CH3 CH4, or CH4 CH3. TPS2012B and TPS2014B TPS2024B 50 MHz: 100:1 100 MHz: 100:1 Measured on one channel, with test signal applied between signal and common of the other channel, and with the same VOLTS/DIV and coupling settings on each channel. Up to 180 waveforms per second, per channel (Sample acquisition mode, no measurements) 1 The maximum peak-to-peak voltage that can be displayed is 40 V p-p with 1x attenuation. Time Base System Table 1-2: Time base system Characteristic Sample Rate Range Waveform Interpolation Record Length Seconds/Division Range Sample Rate and Delay Time Accuracy Description TPS2012B and TPS2014B TPS2024B 5S/sto1GS/s 5S/sto2GS/s (sin x)/x Waveform interpolation is activated for sweep speeds of 100 ns/div and faster samples for each channel TPS2012B and TPS2014B TPS2024B 5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence 2.5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence ±50 ppm over any 1 mstimeinterval TPS2000B Series Digital Storage Oscilloscopes Service Manual 1 3

20 Specifications Table1-2: Timebasesystem(cont.) Characteristic Position Range Delta Time Measurement Accuracy (Full Bandwidth) Description 2.5ns/divto10ns/div: (-4div s/div)to20ms 25 ns/div to 100 ms/div: (-4 div s/div) to 50 ms 250 μs/div to 10 s/div: (-4 div s/div) to 50 s 25 s/div to 50 s/div: (-4 div s/div) to 250 s Conditions Accuracy Single-shot, sample mode ±(1 sample interval ppm reading +0.6ns) >16 averages ±(1 sample interval ppm reading +0.4ns) The limits apply for signals having amplitude > 5 divisions, slew rate at the measurement points of > 2.0 divisions/ns, and acquired > 10 mv/div. Sample interval is the time between the samples in the waveform record. Triggering System Table 1-3: Triggering system Characteristic Holdoff Range External Trigger Input Impedance External Trigger Maximum Input Voltage External Trigger Maximum Float Voltage Description 500 ns to 10 s The ability to set large values of Holdoff is limited by the difficulty in adjusting the Holdoff at Sec/Div settings less than 100 ms/div. This is because Holdoff cannot be set in Scan Mode, which begins at 100 ms/div when Trigger Mode is AUTO. By adjusting Trigger Mode to NORMAL, the Scan Mode operation is turned off, and Holdoff can be adjusted at larger Sec/Div settings. 1M±2%inparallelwith20pF±3pF 300 V RMS CAT 1 and CAT II 150 V RMS CAT III At front panel connector, signal input to BNC shell, 300 V RMS ; derate at 20 db/decade above 100 khz to 13 V peak AC at 3 MHz and above. Based upon sinusoidal or DC input signal. For nonsinusoidal waveforms, peak value must be less than 420 V. Excursion above 300 V should be less than 100 ms duration. RMS signal level must be limited to 300 V. If these values are exceeded, damage to the instrument may result. Input is rated 300 V CAT II, signal to floating common. Rated 600 V CAT II. Instrument chassis is normally considered to be at earth ground. Between instrument chassis and BNC shell 1 4 TPS2000B Series Digital Storage Oscilloscopes Service Manual

21 Specifications Table 1-3: Triggering system (cont.) Characteristic Trigger Sensitivity, Edge Trigger Type. DC Coupled Trigger Sensitivity, Edge Trigger Type, typical SET LEVEL TO 50%, typical Trigger Level Range Description Trigger Source All products TSP2012B TPS2014B TSP2024B EXT EXT/5 EXT/10 Sensitivity 1 div from DC to 10 MHz 1.5 div from 10 MHz to 100 MHz 1.5 div from 10 MHz to 100 MHz 2 div from 100 MHz to 200 MHz 1V p-p from 50 Hz to 100 MHz 2V p-p from 100 MHz to 200 MHz 5X the value of EXT 10X the value of EXT The minimum signal levels required for stable edge triggering of an acquisition when the trigger Source is DC coupled. A stable trigger is one that results in a uniform, regular visual display, triggered on the selected slope. The trigger point must not switch between opposite slopes on the waveform, and the display must not roll across the screen on successive acquisitions. Trigger Frequency Readout typically stabilizes at 25% more signal than generates a stable visual display. At 5 mv/div, 50% additional signal is typically required. Coupling AC NOISE REJ HF REJ Sensitivity Same as DC-coupled limits from 50 Hz and above Reduces the DC-coupled trigger sensitivity by 2 times for greater than 10 mv/div to 5 V/div Same as the DC-coupled limit from DC to 7 khz, attenuates signals above 80 khz LF REJ Same as the DC-coupled limits for frequencies above 300 khz, attenuates signals below 300 khz Operates with input signals equal to or greater than 50 Hz Using a 10 M probe will not affect the operation of this function. Source Range CH1, CH2, CH3 2, CH4 2 EXT EXT/5 EXT/10 ±8 divisions from center of screen ±4 V ±20 V ±35 V The adjustable resolution for Trigger Level is 0.02 division for Ch1 or Ch2 source, (and Ch3, Ch4 for the TPS2014B, TPS2024B) 20 mv for Ext source 100 mv for Ext/5 source 200 mv for Ext/10 source TPS2000B Series Digital Storage Oscilloscopes Service Manual 1 5

22 Specifications Table 1-3: Triggering system (cont.) Characteristic Trigger Level Accuracy, typical Default Settings, Video Trigger Signal Formats and Field Rates, Video Trigger Type Sensitivity, Video Trigger Type, typical Pulse Width Trigger Pulse Width Trigger modes Pulse Width Trigger Point Pulse Width Range Pulse Width Resolution Equal Guard Band Not Equal Guard Band Trigger Frequency Counter Readout Resolution Accuracy, typical Description Accuracies are for signals having rise and fall times 20 ns Source Internal EXT EXT/5 EXT/10 Accuracy ±(0.2div+5mV)within±4divisions from center screen having rise and fall times of >20 ns. ±(6% of setting mv) for signals less than ±2 V ±(6% of setting mv) for signals less than ±10 V ±(6% of setting + 1 V) for signals less than ±20 V A sine wave with 20 ns rise time corresponds to about 18 MHz. Coupling is AC and Auto except for a single sequence acquisition Supports NTSC, PAL, and SECAM broadcast systems for any field or any line Composite video signal Source Internal EXT EXT/5 EXT/10 Range Peak-to-peak amplitude of 2 div 1 V of composite video 5 V of composite video 10 V of composite video A 2 division composite video signal will have a 0.6 division sync tip. Trigger when < (Less than), > (Greater than), = (Equal), or (Not Equal) Positive pulse or Negative pulse Equal: The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level. Not Equal: If the pulse is narrower than the specified width, the trigger point is the trailing edge. Otherwise, the oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width. Less than: The trigger point is the trailing edge. Greater than (also called time-out trigger): The oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width. Selectable from 33 ns to 10 s 16.5 ns or 1 part per thousand, whichever is larger t > 330 ns: ±5% guard band < ±(5.1% ns) t 330 ns: guard band = ±16.5 ns t > 330 ns: ±5% guard band < ±(5.1% ns) 165 ns < t 330 ns: guard band = ns ±33 ns t 165 ns: guard band = ±16.5 ns 6 digits ±51 ppm including all frequency reference errors and ±1 count errors 1 6 TPS2000B Series Digital Storage Oscilloscopes Service Manual

23 Specifications Table 1-3: Triggering system (cont.) Characteristic Frequency Range Signal Source 1 Available only on 4-channel oscilloscopes. 2 TPS2024B only. Description AC coupled, 10 Hz minimum to rated bandwidth. Pulse Width/ Edge Trigger: all available trigger sources. Frequency Counter measures trigger source at all times, including when the oscilloscope acquisition is halted due to changes in the run status, or acquisition of a single shot event has completed. Pulse Width Trigger: The oscilloscope counts pulses of significant magnitude inside the 250 ms measurement window that qualify as triggerable events, such as narrow pulses in a PWM pulse train if set to < mode and the width is set to a relatively small time. Edge Trigger: The oscilloscope counts all edges of sufficient magnitude and correct polarity. Video Trigger: The Frequency Counter does not operate. Display Table 1-4: Display Characteristic Type Resolution Brightness, typical Backlight Intensity 1 Available through the display menu. Description 11.5 cm (W) x 8.64 cm (H), cm diagonal, ¼ VGA, active TFT color liquid crystal display (LCD) with color characters/waveforms on a black background. Surface anti-glare (3H) treatment 320 horizontal by 240 vertical pixels 400 typical, 320cd/m 2 min. Three strings of 5 LEDs in series. Variable minimum is V. 1 Variable maximum is V. 1 Typical current is 25 ma for each of the three strings. Batteries Table 1-5: Batteries Characteristic Real-Time Clock Battery Real-Time Clock Battery Li Ion Battery Packs Description The battery maintains time-of-day information when the oscilloscope is powered off. The battery is sized to provide 5 years of service life. The estimated time that the clock will remain powered from the battery is 5 years. Environmental conditions, especially humidity, affect the number. The battery is not user-replaceable. TPS2000B Series Digital Storage Oscilloscopes Service Manual 1 7

24 Specifications Table 1-5: Batteries (cont.) Characteristic Type Nominal Capacity Battery Life Charge time, nominal Description System supports 2 type NI2040 Li Ion Battery Packs 6600 mah 5.5 hours per battery, 2 channel models 4.5 hours per battery, 4 channel models 300 charge/discharge cycles. Battery will still have 80% of rated capacity after 300 charge cycles. Instrument nonoperating: 4.5 hours Instrument operating: 6.5 hours External DC Input Table 1-6: External DC input Characteristic Voltage Current consumption Connector type Description 15 V, ±1 V The input is not protected from the electrically harsh automobile electrical system. Operation from a vehicle requires a specifically designed external power supply. Typical Power draw from External DC input: 2 channel models, charging a battery: 21 W 2 channel models, no battery: 13 W 4 channel models, charging a battery: 30 W 4 channel models, no battery: 18 W Charging only, instrument OFF: 28 W Maximum power draw from AC line by AC Adapter, 36 watts 2.5 mm male. Use a mating connector with a 2.5 mm barrel hole. Center conductor: positive Outer conductor: negative External Interfaces Table 1-7: External interfaces Characteristic Interfaces for data communication and probe compensation Probe Compensator output voltage, typical Probe Compensator output frequency, typical Description RS-232, Parallel port, Compact flash, Probe compensation 5 V p-p, ±10% into 1 MΩ load 1kHz 1 8 TPS2000B Series Digital Storage Oscilloscopes Service Manual

25 Specifications Mechanical Characteristics Table 1-8: Mechanical characteristics Characteristic Weight, approximate Dimensions, without front protective cover Dimensions, with front protective cover Cooling method Description Instrument only 2.7kg(6.0lbs) 1 battery installed 3.2kg(7.0lbs) 2 batteries installed 3.7kg(8.0lbs) Height 161 mm (6.33 in) Width 336 mm (13.24 in) Depth 130 mm (5.1 in) Height 164 mm (6.45 in) Width 347 mm (13.65 in) Depth 135 mm (5.3 in) Temperature controlled fan. Intake vents on the bottom; exhaust on the right side. Environmental Performance Table 1-9: Environmental performance Characteristic Temperature Humidity Description Operating 1 Nonoperating 1 0 C to 50 C (32 F to 122 F), with 5 C/minute maximum gradient, noncondensing, up to 3000 altitude. Operating 2 Nonoperating 2 5% to 90% relative humidity (%RH) at up to +30 C (86 F ) 5% to 60% relative humidity (%RH) at up to +50 C (122 F) -40 C to +71 C (-40 F to F), with 5 C/minute maximum gradient. 5% to 90% relative humidity (%RH) at up to +30 C (86 F) 3 5% to 60% relative humidity (%RH) between +30 C (86 F) and +71 C (160 F) noncondensing. 3 Altitude, Operating and Nonoperating 3,000 m (10,000 ft) Altitude is limited by possible damage to the LCD at higher altitudes. This damage is independent of operation. Pollution Degree 2 Random Vibration Operating Nonoperating Mechanical Shock, operating g RMS from 5 Hz to 500 Hz, 10 minutes on each axis, 3 axes (30 minutes total) g RMS from 5 Hz to 500 Hz, 10 minutes on each axis, 3 axes (30 minutes total). Half-sine mechanical shocks, 50 g peak amplitude, 11 ms duration, 3 drops in each direction of each axis (18 total) 1 Charge battery packs between 0 C and 45 C (32 F to 113 F). Charging battery packs outside this range can damage cells or cause them to leak. 2 Battery packs are rated to operate between -10 C and +50 C (-14 F and +122 F) with less than 80% relative humidity. Operating outside this range can cause damage. Battery discharge capacity drops significantly at temperatures below 0 C (32 F) and above 45 C (113 F). 3 Max wet bulb. 4 With one battery pack installed. TPS2000B Series Digital Storage Oscilloscopes Service Manual 1 9

26 Specifications 1 10 TPS2000B Series Digital Storage Oscilloscopes Service Manual

27 Operating Information

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29 Operating Information For information on installing and operating your TPS2000B Series Digital Storage Oscilloscope, refer to the TPS2000B Series Digital Storage Oscilloscope User Manual. (Seepage ix, Related Manuals.) TPS2000B Series Digital Storage Oscilloscopes Service Manual 2 1

30 Operating Information 2 2 TPS2000B Series Digital Storage Oscilloscopes Service Manual

31 Theory of Operation

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33 Theory of Operation This section describes the electrical operation of the TPS2000B Series oscilloscopes to the module level. It describes the basic operation of each functional circuit block shown in the following figure. Figure 3-1: TPS2000B Series module-level block diagram. Remove CH3 and CH4 for a 2-channel version TPS2000B Series Digital Storage Oscilloscopes Service Manual 3 1

34 Theory of Operation Acquisition Board The Acquisition board of the TPS2000B Series four-channel oscilloscope is essentially a dual, two-channel oscilloscope tied together through a common microprocessor, and some special interconnects. This allows the combining of the display and trigger systems. The focus of this Acquisition board discussion is on the two-channel system, with differences noted as necessary. At a minimum, the Acquisition board contains the following components: Attenuators ASIC amplifier Isolation circuit Digitizer-trigger system ASIC Signal-processing/display/system services ASIC RAM FLASH ROM Microprocessor Internal peripheral interface Power supplies For a four-channel oscilloscope, the attenuators and ASICs are duplicated. Most of the other aspects of the circuitry are the same as for the two-channel oscilloscope. Acquisition System Signals from the CH 1, CH 2, and other input connectors pass through attenuators and anac-couplingswitchtotheamplifier ASIC. The EXT TRIG input uses an abbreviated version of this path, without some of the attenuator settings and the AC coupling switch. The amplifier ASIC contains buffers and variable gain amplifiers, as well as filters that provide 20 MHz bandwidth limiting. The task of the amplifier ASIC is to convert from a 1 MΩ single-ended environment in the input to a much lower impedance differential (and thus less noise-sensitive) environment for the isolation and acquisition process. The amplifier ASIC assures that the input signal is amplified to approximately the correct level to allow the fullest possible use of the isolation circuit and digitizer. The isolation circuit uses a modulation clock to transfer the input signal across the isolation boundary via an isolation transformer. The input signal is demodulated and sent to the acquisition ASIC. Control of the amplifier ASIC across the isolation boundary is provided by an optocoupler. Power is provided to each amplifier ASIC and associated circuits by an isolated switching power supply, dedicated to each channel. 3 2 TPS2000B Series Digital Storage Oscilloscopes Service Manual

35 Theory of Operation Each acquisition ASIC contains samplers and peak detectors, an amplifier, an A/D converter, and the trigger logic. The digitized waveform samples are transferred to the processing and display ASIC. In four-channel systems, the two acquisition ASICs are interconnected so that a trigger on one ASIC can produce a trigger on the other. The processor system adds the microprocessor and FLASH ROM to the processing and display system. The processor system interprets the front-panel control changes detected by the display ASIC, provides control parameters based upon user setting requests, computes waveform measurements, and manages the internal and external peripherals. Saved setups, waveforms, and calibration constants are stored in nonvolatile memory (NVRAM). The processor system shares DRAM with the display system. Processing and Display System The processing and display system consists of the display ASIC, DRAM, and system oscillator. Digitized acquisition samples are received by the display ASIC and stored in DRAM. Once data are received by the display ASIC, various corrections are applied, display rasterization is performed, and the waveform is placed into a display buffer. At the same time, the waveform is being read from the display buffers and written to the LCD. Additional circuitry in the display ASIC supports scanning of the front panel, provides DRAM refresh, processes the clock, and performs various memory mapping tasks required by all elementary microprocessor-based systems. In a four-channel system, the two display ASICs are interconnected so that one ASIC may provide display information for the second. The processing and display system handles some of the computational tasks. Other tasks are performed by the processor system. Since all array processing is performed in the processing and display system, no computations can be performed that involve data from two different channel sets. Thus, subtracting channel 3 data from channel 2 is prohibited. Probe Compensation The PROBE COMP and ground terminals are provided for probe adjustment. Acquisition Board Power The IO board supplies the Acquisition board with 5.0, 3.0, 3.3, and 15 V DC.These sources are used directly or as sources for other converters on the Acquisition board. The Acquisition board supplies 35 volts used for series-strings of LEDs on the front panel for button illumination. TPS2000B Series Digital Storage Oscilloscopes Service Manual 3 3

36 Theory of Operation Power Supply and Battery System The IO board accepts the power input for the oscilloscope from either a 15 V DC external supply or from one of two internal Lithium-Ion battery packs. The battery packs are SMBus compliant and user replaceable. A microcontroller manages the routing of power from the DC input and the two battery packs. It also manages the charging of batteries and communication to the Acquisition board. The instrument cooling fan is powered by the IO board. The fan can be switched on and off, having its voltage varied by signals from the Acquisition board. Power for the LCD Backlight Inverter board is supplied by the IO board. A dimming voltage, derived from a PWM pulse train and RC low-pass filter, controls the brightness of the backlight. RS-232 and Parallel port signals are passed from the Acquisition board through the IO board to their rear-mounted connectors. Display Module The Liquid Crystal Display pattern consists of 320 columns with 3 subcolumns and 240 rows, and has associated drivers and a backlight. Front Panel Two-Channel Oscilloscopes All switches, position encoders, and LEDs are mounted on the Front Panel board of the two-channel oscilloscope. Additionally, an IC on this board provides buffering and multiplexing of switch signals for the Acquisition board. (Two signals and a sense line are provided by the Acquisition board to support the front panel.) One of these signals resets the scan, and a second clocks the scan to the next position. The sense line receives the current state of the selected switch or encoder position. For the encoders, some amount of debouncing occurs inside the front-panel IC. All key debouncing is handled in the display ASIC on the Acquisition board. Four-Channel Oscilloscopes The Front Panel board for four-channel oscilloscopes is effectively two front panels in parallel. The left side of the board is largely handled by the display ASIC for channels 1 and 2. The right side of the board is handled by the channel 3 and 4 ASIC. Separate front-panel ICs support these data paths. 3 4 TPS2000B Series Digital Storage Oscilloscopes Service Manual

37 Theory of Operation LEDs The front panel contains three LEDs that light to indicate when the Save or Autorange controls, or the multipurpose knob are active. In addition, most buttons have an LED behind them for illumination in low-light conditions. Button illumination can be turned off in the Utility menu. Internal Peripherals The Acquisition board includes an FPGA that manages communication between the microprocessor and the internal program memory (FLASH), RTC (Real-Time Clock), battery system, and temperature sensor. The temperature sensor is used for fan control. External Peripherals The Acquisition board FPGA also manages communication between the microprocessor and external RS-232 port, Printer Port, and Compact FLASH Card. TPS2000B Series Digital Storage Oscilloscopes Service Manual 3 5

38 Theory of Operation 3 6 TPS2000B Series Digital Storage Oscilloscopes Service Manual

39 Performance Verification

40

41 Performance Verification This section contains performance verification procedures for the specifications marked with the symbol. The following equipment, or a suitable equivalent, is required to complete these procedures. Required Equipment Table 4-1: Required equipment Description Minimum requirements Examples DC Voltage Source Leveled Sine Wave Generator Time Mark Generator 17.5mVto7V, ±0.5% accuracy 50 khz and 200 MHz, ±3% amplitude accuracy 10 ms period, ±10 ppm accuracy Fluke 9100 Universal Calibration System with Oscilloscope Calibration Module (Option 250) Fluke 5500A Multi-product Calibrator with Oscilloscope Calibration Option (Option 5500A-SC) 50Ω BNC Cable BNC male to BNC male, 1 m (36 in) long Tektronix part number XX 50Ω BNC Cable BNC male to BNC male, 25 cm (10 in) long Tektronix part number XX 50Ω Feedthrough Termination Dual Banana to BNC Adapter BNC male and female connectors Tektronix part number XX Banana plugs to BNC female Tektronix part number Splitter, Power Frequency range: DC to 4 GHz. Tracking: >2.0% Tektronix part number XX TPS2000B Series Digital Storage Oscilloscopes Service Manual 4 1

42 Performance Verification Test Record Table 4-2: Test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: RH %: Technician: Test Passed Failed Self Test Oscilloscope tests Low limit Test result High limit Channel 1 DC Gain Accuracy Channel 2 DC Gain Accuracy Channel 3 DC Gain Accuracy Channel 4 DC Gain Accuracy Channel 1 DC Measurement Accuracy 5mV/div 33.6 mv 36.4 mv 200 mv/div V V 2V/div V V 5mV/div 33.6 mv 36.4 mv 200 mv/div V V 2V/div V V 5mV/div 33.6 mv 36.4 mv 200 mv/div V V 2V/div V V 5mV/div 33.6 mv 36.4 mv 200 mv/div V V 2V/div V V 5mV/div Vertical Position = mv mv Vertical Position = 17.6 mv 31.3 mv 38.7 mv 200 mv/div 2V/div 5mV/div Vertical Position = mv 742 mv Vertical Position = 704 mv 1.33 V 1.47 V Vertical Position = V V Vertical Position = 7.04 V V V Vertical Position = mv mv Vertical Position = 17.6 mv 38.7 V 31.3 V 200 mv/div 2V/div Vertical Position = mv 658 mv Vertical Position = 704 mv 1.47 V 1.33 V Vertical Position = V V Vertical Position = 7.04 V V V V pos V neg 4 2 TPS2000B Series Digital Storage Oscilloscopes Service Manual

43 Performance Verification Oscilloscope tests Low limit Test result High limit Channel 2 DC Measurement Accuracy 5 mv/div V pos Vertical Position = mv mv Vertical Position = 17.6 mv 31.3 mv 38.7 mv 200 mv/div 2V/div Vertical Position = mv 742 mv Vertical Position = 704 mv 1.33 V 1.47 V Vertical Position = V V Vertical Position = 7.04 V V V Channel 3 DC Measurement Accuracy 5 mv/div V neg Vertical Position = mv mv Vertical Position = 17.6 mv 38.7 V 31.3 V 200 mv/div Vertical Position = mv 658 mv Vertical Position = 704 mv 1.47 V 1.33 V 2V/div Vertical Position = V V Vertical Position = 7.04 V V V 5 mv/div V pos Vertical Position = mv mv Vertical Position = 17.6 mv 31.3 mv 38.7 mv 200 mv/div Vertical Position = mv 742 mv Vertical Position = 704 mv 1.33 V 1.47 V 2 V/div Vertical Position = V V Vertical Position = 7.04 V V V 5 mv/div V neg Vertical Position = mv mv Vertical Position = 17.6 mv 38.7 V 31.3 V 200 mv/div Vertical Position = mv 658 mv Vertical Position = 704 mv 1.47 V 1.33 V 2V/div Vertical Position = V V Vertical Position = 7.04 V V V TPS2000B Series Digital Storage Oscilloscopes Service Manual 4 3

44 Performance Verification Oscilloscope tests Low limit Test result High limit Channel 4 DC Measurement Accuracy 5mV/div Vertical Position = mv mv Vertical Position = 17.6 mv 31.3 mv 38.7 mv 200 mv/div 2V/div 5mV/div Vertical Position = mv 742 mv Vertical Position = 704 mv 1.33 V 1.47 V Vertical Position = V V Vertical Position = 7.04 V V V Vertical Position = mv mv Vertical Position = 17.6 mv 38.7 V 31.3 V 200 mv/div 2V/div Vertical Position = mv 658 mv Vertical Position = 704 mv 1.47 V 1.33 V Vertical Position = V V Vertical Position = 7.04 V V V Channel 1 Bandwidth 2.12 V Channel 2 Bandwidth 2.12 V Channel 3 Bandwidth V Channel 4 Bandwidth V Sample Rate and Delay Time Accuracy -2 divs +2 divs Channel 1 Edge Trigger Sensitivity Stable trigger Channel 2 Edge Trigger Sensitivity Stable trigger Channel 3 Edge Trigger Sensitivity 1 Stable trigger Channel 4 Edge Trigger Sensitivity 1 Stable trigger External Edge Trigger Sensitivity Stable trigger 1 Channels 3 and 4 are only on four channel oscilloscopes. V pos V neg 4 4 TPS2000B Series Digital Storage Oscilloscopes Service Manual

45 Performance Verification Performance Verification Procedures Before beginning these procedures, two conditions must be met: The oscilloscope must have been operating continuously for twenty minutes within the operating temperature range specified in the environmental specifications. (See Table 1-9 on page 1-9.) You must perform the following Self Calibration operation. If the ambient temperature changes by more than 5 C, you must perform the Self Calibration operation again. The time required to complete the entire procedure is approximately one hour. WARNING. Some procedures use hazardous voltages. To prevent electrical shock, always set voltage source outputs to 0 V before making or changing any interconnections. Self Test This internal procedure is automatically performed every time the oscilloscope is powered on. No test equipment or hookups are required. Verify that no error messages are displayed before continuing with this procedure. Self Calibration The self calibration routine lets you quickly optimize the oscilloscope signal path for maximum measurement accuracy. You can run the routine at any time, but you should always run the routine if the ambient temperature changes by 5 C or more. 1. Remove signals from all channels. 2. Push the UTILITY button and select the Do Self Cal option to start the calibration. This routine can take up to five minutes to complete. 3. Verify that instrument passed self-calibration. Check DC Gain Accuracy This test checks the DC gain accuracy of all input channels. 1. Set the DC voltage source output level to 0V. 2. Set up the oscilloscope using the following steps: Press menu button Select menu option Select setting DEFAULT SETUP Channel 1 Voltage Probe 1X ACQUIRE Average 64 MEASURE Source Channel 1 Type Mean 3. As shown in the following figure, connect the oscilloscope channel to be tested to the DC voltage source. TPS2000B Series Digital Storage Oscilloscopes Service Manual 4 5

46 Performance Verification 4. For each VOLTS/DIV setting listed in the following table, perform the following steps: a. Set the DC voltage source output level to the positive voltage listed and record the mean measurement as V pos. b. Reverse the polarity of the DC voltage source and record the mean measurement as V neg. c. Calculate V diff =V pos -V neg and compare V diff to the accuracy limits in the table. DC voltage source VOLTS/DIV setting output levels Accuracy limits for V diff 5 mv/div mv, mv 33.6 mv to 36.4 mv 200 mv/div +700 mv, -700 mv V to V 2V/div V, V V to V 5. Set DC voltage source output level to 0V. 6. Disconnect the test setup. 7. Repeat steps 1 through 6 until all input channels have been checked (CH1 and CH2 for a two-channel model; CH1, CH2, CH3, and CH4 for a four-channel model.) Check DC Measurement Accuracy This test checks the DC measurement accuracy of all input channels. 1. Set the DC voltage source output level to 0V. 2. Set up the oscilloscope using the following steps: Press menu button Select menu option Select setting DEFAULT SETUP Channel 1 Voltage Probe 1X ACQUIRE Average 64 MEASURE Source Channel 1 Type Mean 4 6 TPS2000B Series Digital Storage Oscilloscopes Service Manual

47 Performance Verification 3. As shown in the following figure, connect the oscilloscope channel selected in the table to the DC voltage source. 4. Record DC Measurement Accuracy with Vertical Position set to 0V a. Ensure that the Vertical Position is set to zero. b. Set the DC voltage source output level to the positive voltage listed in the following table and record the mean measurement in the test record as V pos with Vertical Position at zero. c. Set the DC voltage source output level to the negative voltage listed in the following table and record the mean measurement in the test record as V neg with Vertical Position at zero. d. Repeat for all settings in the table and ensure that all readings are within the limits given in the Test Record. DC voltage source output levels when Vertical Position is set to 0V Volts/div setting V pos V neg 5 mv/div mv 17.6 mv 200 mv/div +720 mv 720 mv 2V/div +7.2 V 7.2 V 5. Record DC Measurement Accuracy with Vertical Position not set to 0V a. Set the Vertical Position to 1 (positive voltage) 2 and record the mean measurement in the test record as V pos with Vertical Position not zero. b. Set the Vertical Position to (negative voltage) 2 and record the mean measurement in the test record as V neg with Vertical Position not zero. c. Repeat for all settings in the table and ensure that all readings are within the limits given in the Test Record. TPS2000B Series Digital Storage Oscilloscopes Service Manual 4 7

48 Performance Verification DC voltage source output levels When Vertical Position is not set to OV Volts/div setting V pos V neg 5 mv/div +35 mv 35 mv 200 mv/div +1.4 V 1.4 mv 2V/div V 14.4 V 7. Set DC voltage source output level to 0V. 8. Disconnect the test setup. 9. Repeat steps 1 through 8 until all input channels have been checked (CH1 and CH2 for a two-channel model; CH1, CH2, CH3, and CH4 for a four-channel model.) Check Bandwidth This test checks the bandwidth of all input channels. 1. Set up the oscilloscope using the following steps: Press menu button Select menu option Select setting DEFAULT SETUP Channel 1 Voltage Probe 1X ACQUIRE Average 16 TRIGGER Coupling Noise MEASURE Source Channel 1 Type Pk-Pk 2. As shown in the following figure, connect the oscilloscope channel selected in the table to the leveled sine wave generator. 3. Set the oscilloscope VOLTS/DIV to 500 mv/div. 4. Set the oscilloscope SEC/DIV to 10 ms/div. 5. Set the leveled sine wave generator frequency to 50 khz. 4 8 TPS2000B Series Digital Storage Oscilloscopes Service Manual

49 Performance Verification 6. Set the leveled sine wave generator output level so the peak-to-peak measurement is between 2.98 V and 3.02 V. 7. Set the leveled sine wave generator frequency to: 100 MHz if you are checking a TPS2012B/2014B. 200 MHz if you are checking a TPS2024B, 180 MHz for operating temperaturesfrom40 Cto50 C. 8. Set the oscilloscope SEC/DIV to 10 ns/div. 9. Check that the peak-to-peak measurement is 2.12 V. 10. Disconnect the test setup. 11. Repeat steps 1 through 10 until all input channels have been checked. Check Sample Rate and Delay Time Accuracy This test checks the time base accuracy. 1. Set up the oscilloscope using the following steps: Press menu button Select menu option Select setting DEFAULT SETUP Channel 1 Voltage Probe 1X 2. Connect the oscilloscope to the time mark generator as shown in the following figure. 4. Set the time mark generator period to 10 ms. 5. Set the oscilloscope VOLTS/DIV to 500 mv/div. 6. Set the oscilloscope Main SEC/DIV to 1ms/div. 7. Press SET LEVEL TO 50%. 8. Use the vertical POSITION control to center the test signal on screen. 9. Use the horizontal POSITION control to set the position to ms. 10. Set the oscilloscope SEC/DIV to 250 ns/div. TPS2000B Series Digital Storage Oscilloscopes Service Manual 4 9