Model 900. Tunable Active Filter Instruments

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1 Model 9 Single Channel- Certified Description Frequency Devices Model 9 instruments furnish the user with a 4 or -pole low-pass or high-pass instrument that has a field replaceable filter module and is tunable by front panel controls. The controls allow the user to select a corner frequency between.1hz and 49.9kHz with a resolution of 1:499 for each of the four selectable ranges. The instrument exhibits an input impedance of 1 MΩ shunted by 47pF to a single ended signal source. When configured in the differential mode, the instrument has a common mode rejection ratio (CMRR) which exceeds 6dB; in this mode the instrument presents an input impedance of MΩ shunted by 47pF to a double ended single source. Front panel gain control also enables the operator to select a gain factor of,, or db. Standard operational features include: 1) Plug-in Filter Module ) djustable Frequency Control 3) Differential Input mplifiers 4) djustable Gain Control ) Off-set djustment 6) Bypass Control 7) BNC Connectors for Signal I/O n optional battery powered version (9B)is available and is particularly well suited to applications requiring isolation from an electrically noisy primary power source. Compact size and manual rotary switch front panel controls make 9 instruments a popular, cost effective, easy-to-use solution for signal conditioning applications in the following areas: nti-aliasing Filters Biomedical/Biotechnology pplications Data Recording/Playback Data Smoothing EKG/EEG Signal Filtering FDM/PCM Signal Filtering Medical Research Industrial Process Control Seismic nalysis Vibration nalysis Tunable ctive Filter Instruments Chassis: C Standard C powered chassis 9B C powered, with battery powered option vailable Low-Pass Models: Page 9L4B 4-pole, Butterworth L4L 4-pole, Bessel LB -pole Butterworth LL -pole, Bessel LE -pole, elliptic, 1.77, db LEY -pole, elliptic,., db LD -pole, constant delay, db LD -pole, constant delay, db vailable High-Pass Models: Page 9H4B 4-pole, Butterworth HB -pole, Butterworth HE -pole, elliptic, 1.77, db HEY -pole, elliptic,., db General Specifications: Ordering information

2 Model 9 BLOCK DIGRM Tunable ctive Filter Instruments GIN (db) INPUT db db db -B + OUT DIFF MP -POLE TUNBLE FILTER OUTPUT MP B OFFSET OFFSET NULLED TYPICL DJUSTMENT FUNCTION CORNER FREQUENCY TUNING BYPSS TYPICL FRONT PNEL BNC CONNECTOR 1 CORNER FREQUENCY HZ MULTIPLIER FRONT PNEL 9

3 Model 9L4B 9L4L 9LB 9LL Product Specifications Transfer Function 4-Pole, 4-Pole, -Pole, -Pole, Butterworth Bessel Butterworth Bessel Model 9 4 & -Pole Low-Pass Filters Range fc,.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz Theoretical Transfer ppendix ppendix ppendix ppendix Characteristics Page 7 Page Page 9 Page 4 Tuning Resolution 1 part in part in part in part in 499 within each decade within each decade within each decade within each decade Passband Ripple. db. db. db. db (theoretical) DC Voltage Gain ±. db max. ±. db max. ±. db max. ±. db max. (non-inverting) ±.1 db typ. ±.1 db typ. ±.1 db typ. ±.1 db typ. Stopband ttenuation 4 db/octave 4 db/octave 4 db/octave 4 db/octave Cutoff Frequency fc ± % max. fc ± % max. fc ± % max. fc ± % max. ccuracy ± % max. ± % max. ± % max. ± % max. ±.% typ. ±.% typ. ±.% typ. ±.% typ. Stability ±.% / C max. ±.% / C max. ±.% / C max. ±.% / C max. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. mplitude -3dB -3dB - 3 db - 3 db Phase Filter ttenuation.67 db. fc 1.6 db. fc.1 db. fc 1.91 db. fc (theoretical) 3.1 db 1. fc 3.1 db 1. fc 3.1 db 1. fc 3.1 db 1. fc 3. db.37 fc 3. db 3. fc 6. db.37 fc 6. db 4. fc 4. db 3.16 fc 4. db 4.7 fc. db 3.16 fc. db 6.7 fc Total Harmonic < - 9 db typ. < - 9 db typ. < - 9 db typ. < - 9 db typ. 1 khz Wide Band Noise µvrms typ µvrms typ µvrms typ. µvrms typ. ( Hz - MHz) Narrow Band Noise µvrms typ. µvrms typ. µvrms typ. µvrms typ. ( Hz - khz) 3

4 Model 9LE 9LEY 9LD 9LD Product Specifications Model 9 -Pole Low-Pass Filters Transfer Function -Pole, 6 zero, -Pole, 6 zero -Pole, 6 zero -Pole, 6 zero, Elliptic Elliptic Constant Delay Constant Delay Range fc, fr.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz Theoretical Transfer ppendix ppendix ppendix ppendix Characteristics Page 4 Page Page 1 Page Tuning Resolution 1 part in part in part in part in 499 within each decade within each decade within each decade within each decade Passband Ripple ±.3 db -. db.1 db.1 db (theoretical) DC Voltage Gain ±. db max. ±. db max. ±. db max. ±. db max. (non-inverting) ±.1 db typ. ±.1 db typ. ±.1 db typ. ±.1 db typ. Stopband ttenuation - db typ. - db typ. - db typ. - db typ. Cutoff Frequency fr ± % max. fr ± % max. fc ± % max. fc ± % max. ccuracy ± % max. ± % max. ± % max. ± % max. ±.% typ. ±.% typ. ±.% typ. ±.% typ. Stability ±.% / C max. ±.% / C max. ±.% / C max. ±.% / C max. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. mplitude -.3 db -. db - 3 db - 3 db Phase Filter ttenuation.3 db 1. fr. db 1. fr 3.1 db 1. fc 3.1 db 1. fc (theoretical) 3.1 db 1.13 fr 3.1 db 1.6 fr 6. db 3. fc. db 4.4 fc 6. db 1.67 fr. db 1.3 fr. db 3.7 fc. db. fc. db 1.77 fr. db. fr Total Harmonic < - 9 db typ. < - db typ. < - 9 db typ. < - db typ. 1 khz Wide Band Noise µvrms typ. µvrms typ. µvrms typ. µvrms typ. ( Hz - MHz) Narrow Band Noise 7 µvrms typ. 7 µvrms typ. µvrms typ. µvrms typ. ( Hz - khz) 4

5 Model 9H4B 9HB 9HE 9HEY Product Specifications Model 9 4 & -Pole High-Pass Filters Transfer Function 4-Pole -Pole -Pole, 6 zero -Pole, 6 zero Butterworth Butterworth Elliptic Elliptic Range fc, fr.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz.1 Hz to 49.9 khz Theoretical Transfer ppendix ppendix ppendix ppendix Characteristics Page 7 Page 9 Page 37 Page 3 Tuning Resolution 1 part in part in part in part in 499 within each decade within each decade within each decade within each decade Passband Ripple. db. db ±.3 db -. db (theoretical) Voltage Gain ±. db to khz ±. db to khz ±. db to khz max. ±. db to khz max. (non-inverting) ±. db to 1 khz ±. db to 1 khz ±. db to 1 khz typ. ±. db to 1 khz typ. Power Bandwidth 1 khz 1 khz 1 khz 1 khz Stopband ttenuation 4 db/octave 4 db/octave - db typ. - db typ. Cutoff Frequency fc ± % max. fc ± % max. fr ± % max. fr ± % max. ccuracy ± % max. ± % max. ± % max. ± % max. ±.% typ. ±.% typ. ±.% typ. ±.% typ. Stability ±.% / C max. ±.% / C max. ±.1% / C max. ±.% / C max. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. ±.1% / C typ. mplitude - 3 db - 3 db -.3 db -. db Phase Filter ttenuation 4 db.31 fc db.31 fc db.6 fr db. fr (theoretical) 3 db.4 fc 6 db.4 fc 6. db.6 fr. db. fr 3.1 db 1. fc 3.1 db 1. fc 3.1 db. fr 3.1 db.94 fr. db. fc. db. fc.3 db 1. fr.3 db 1. fr. db. fr. db. fr Total Harmonic < - db typ. < - db typ. < - db typ. < - db typ. Distortion Wide Band Noise 4 µvrms typ. 4 µvrms typ. 4 µvrms typ. µvrms typ. ( Hz - MHz) Narrow Band Noise µvrms typ. µvrms typ. µvrms typ. 1 µvrms typ. ( Hz - khz)

6 Location of Front Panel Terminals and Controls Model 9 Location of Front Panel Terminals and Controls B C D E F G H J POWER CORNER FREQUENCY HZ MULTIPLIER CTIVE FILTER GIN BYPSS INPUT (DB) ON OFF IN OUT -B 9 OFFSET + OUT B. POWER ON/OFF Switch: two position toggle switch that interrupts/completes the internal DC power circuit and resets the battery protection circuit. K L M N O E. CORNER FREQUENCY Selector Switch (-9): This ten position rotary switch selects the 1 s digit of the desired corner frequency between and 9, in discrete increments of 1. K. OFFSET djust: This adjustment is intended to zero the offset that results from the instruments own circuitry and does not provide for wide range offset to remove dc input signals. B. POWER Status Lamp: This red LED indicates whether or not the power to the analog filter circuitry of a Model 9 instrument is correct. With the POWER switch in the ON position the LED glows continuously if the internal DC power levels are correct, flashes for low DC power levels, and goes off for grossly improper DC power levels. See power lamp status, page 14. C. CORNER FREQUENCY Selector Switch (-4): This five position rotary switch selects the s digit value of the corner frequency designator. The switch selectable values are,,, 3, and 4 in five discrete steps. D. CORNER FREQUENCY Selector Switch (-9): This ten position rotary switch selects the s digit of the desired corner frequency between and 9, in discrete increments of. F. MULTIPLIER Selector Switch: This four position rotary switch multiplies by a factor of either.1, 1,, or, the aggregate value set on the three CORNER FREQUENCY selector switches. (C, D & E). G. GIN Switch: This three position toggle switch selects an overall filter gain of either,, or db. H. BYPSS Switch: OUT and IN setting of this two position toggle switch routes the input signal to the internal low-pass filter or around it, respectively. For either case, the GIN switch remains operational. J. INPUT Switch: This three position toggle configures the instrument for either differential inputs (-B), a singleended input (), or input nulling ( ) which grounds both the () and (B) input terminals. L. GROUND ( ) Terminal: This Banana type test jack provides neat and secure access to the internal ground. This terminal is a convenient junction for grounding external system and measurement instrumentation and/or apparatus. M. OUT Terminal: This terminal is a female BNC connector. The shield on the BNC is internally connected to the instrument ground. N & O. () and (B) Input Terminals: This pair of shielded, female BNC connectors accept signal inputs () and (B). The instrument applies a noninverting gain to input () and an equal but opposite inverting gain to input (B) while the GIN switch sets the magnitude of differential gain to either,, or db. The BNC shields have been internally connected to the instrument ground. 6

7 Model 9 Location of Rear Panel Terminals and Controls Controls and Terminals P Q FUSE 3/16 V SELECT 1V V NOM VDC NOM FREQ - 6 HZ - 6 HZ S MODEL No. 9_L SERIL No. 67 R 1 MDE IN U.S.. /31/94 VOLTGE SELECTOR P. IDENTIFICTION LBEL: This label identifies the filter type, serial number and date of manufacture. Q. POWER designation: This label identifies operating power limits and fuse requirements of the instrument. POWER Lamp Status R. POWER CONNECTION: Denotes plug and fuse location. S. VOLTGE Selector Switch: This two position switch determines the operating voltage (1 Vac or Vac). t time of shipment, the voltage select switch is preset in the 1 Vac position. For Vac operation, this switch must be rotated to the Vac position. Filter Replacement Instructions: POWER SOURCE LMP STTUS C POWER LINE INTERNL BTTERY ON Operating Normally Operating Normally Line and internal voltages are correct Sufficient battery charge FLSHING Possible Causes: Possible Causes: Low C line voltage Batteries near exhaustion Fault external causing power overload Internal instrument fault (approximately 3 minutes of operation remain OFF Possible Causes: Possible Causes: POWER Switch off POWER Switch off Momentary power line drop-out Internal protection circuit tripped protection circuit.* tripped.* Open line fuse *Reset by cycling POWER Switch off then on. Steps to Follow: 1. Unplug (disconnect from Power) instrument.. Turn chassis over. 3. With black instrument supports facing up, remove mounting screws. 4. Holding cover in place, turn unit to up-right position and remove top cover.. Locate black filter module and carefully remove from channel board. 6. Match replacement filter module pin locations with insertion holes in channel board and gently insert replacement module. 7. Replace instrument top cover, carefully turn over and install instrument supports and screws. 7

8 Model 9 Operation and pplication Guide Lines Initial Setup Select desired operating voltage 1 Vac or Vac. See note "S" page 14. Set the POWER ON/OFF Switch to ON. continuously lit POWER status lamp denotes proper internal dc voltages, an essential indication for battery powered models. llow the instrument a three minute warm-up period to achieve thermal equilibrium. To perform initial adjustment and/or operational testing, set the remaining front panel controls as follows: a) The three base CORNER FREQUENCY switches and the MULTIPLIER to the desired corner frequency... b) The OFFSET control to approximately mid-range... c) The GIN switch to the desired value... d) The BYPSS switch to OUT... e) The INPUT switch to ground ( )... Connect a dc-coupled oscilloscope, of vertical sensitivity mv/cm or better, or a digital voltmeter (DVM) to the instrument front panel BNC connector labeled OUT. Circuit model illustrating relationship between filter's differential input amplifier and external signal and error sources. INPUT SIGNL ND NOISE VOLTGE SOURCES V CM V V B R S SIGNL COMMON R SB COUPLED POWER LINE NOISE VOLTGE SIGNL COMMON V P * B * (+) ( ) db db db R + CM+ R DIFF D MP - R CM- Vs DIFFERENTIL INPUT MPLIFIER COM ( ) (+) +Vs C POWER SUPPLY OR INTERNL BTTERIES Set the OFFSET control for a zero-volt reading on the scope. Subsequent changes of CORNER FREQUENCY, GIN or BYPSS control settings will introduce a small dc output offset which should be zeroed for critical applications. Leaving all other controls unchanged, set the Input Switch to (-B) and apply a Vdc signal simultaneously to input BNCs () and (B). The voltage measured at the OUT BNC should be -=OVdc. This completes preliminary test and adjustment. Corner Frequency Selection To select a corner frequency, simply set the three CORNER FREQUENCY switches and the MULTIPLIER switch for the desired numerical value. The CORNER FREQUENCY switch weighings follow standard decimal positional convention. * GIN = K FILTER/ BYPSS OUTPUT MPLIFER Vo = K(V - VB) + Vcm/CMRR : WHERE K = 1, ND FOR GIN SETTINGS OF, ND db RESPECTIVELY. SEE TEXT FOR REMINING TERMS. * DENOTES FRONT PNEL CCESS * OUT The C, D and E switches combined can select base corner frequency values ranging from 1 to 499 Hz in 1Hz steps, with switch weighings as just described. The accuracy of the corner frequency is improved by selecting the largest possible base frequency and down scaling by the MULTIPLIER. The greatest accuracy is obtained with the largest base 4, and the.1x MULTIPLIER switch 4 setting. Relative accuracy of selected 4 Hz actual corner frequency for different multiplier switch settings. BSE FREQ X MULT. RELTIVE msd Isd TUNING C D E F CCURCY 4.1X GRETEST 4 1X LESS 4 X LEST The instrument utilizes a differential input amplifier to reject prevalent forms of electrical interference, while presenting desirable input characteristics to the signal source requiring filtering. The differential Input The differential input configuration is ideal for measuring the difference between two values rather than the values themselves. Bridge circuits utilizing strain gages, thermocouples and a variety of other types of transducers generate differential full scale output voltages in the order of millivolts that are often superimposed upon volt-level reference and noise values. The importance of CMRR In actual system environments, each signal and power return conductor can generate an interference voltage proportional to the net conductor resistance and the electrical current level. ny such interference voltages appear as common mode signals to the amplifier, and are rejected as such.

9 Model 9 Specifications (@ C and rated Power Input) Input Characteristics Input Impedance: Differential Single Ended Input Voltage: Linear Differential* Max Safe Differential Max Safe Common Mode Bias Current Common Mode Rejection Ratio with kω Source Unbalance and db Gain MΩ Shunted by 47pF 1 MΩ Shunted by 47pF V p-p (Gain Set at db) ny Continuous Value between +/-V ny Continuous Value between +/-V 17p max.; 3p typ. > 6dB, dc to khz CMRR db Common Mode Rejection Ratio vs. Frequency Vin = Vp-p CMRR = log Vout Vin FILTER in B in Vout Vin Output Characteristics Full Power Bandwidth** Maximum Output Voltage Short Circuit Output Current Output Protection Output Impedance Offset Voltage Power Supply C Line Operation: Power dc to 6kHz V p-p for R L = Ω V p-p for R L = kω +/- m continuous +/- m without damage Short Circuit to Ground Only Ω djustable to Zero at Front Panel (Range +/-mv dc) Watts max. Voltage Frequency Range-Rear Panel: 1 V to /6Hz V to Hz Fuse 3/16 mp VOLTS p-p K RMS LOD CURRENT K K 1M M FREQUENCY HZ Output Voltage Swing vs. Load Resistance OUTPUT VOLTGE SWING vs. LOD RESISTNCE 1K K k LOD Ω Voltage Noise vs. Frequency LOD CURRENT m 1x -4 Battery Operation (Optional) Time for full Charge 14 to 16 C Battery Life pprox. Charge-Discharge Cycles Battery Charger utomatic Uninterruptible Charge Status Indicator-Front Panel 3 Status Levels Battery Operation 9 hours typ. (See graph) Temperature Operating Temperature: With Batteries + C to + C C Line C to + C Storage Temperature - C to +7 C Mechanical Dimensions Weight with Battery without Battery Case Material Color 3."H x."w x 9.3"D.9cmH x 1.9cmW x 3.6cmD 4. lbs;.4 kgs. 3. lbs; 1.9 kgs BS plastic PC Bone * Signal plus common mode voltage cannot exceed V peak for a linear output. ** Output characteristics of input amp with filter by-passed. 9 dbv/ HZ (dbv = 1VRMS) TIME (HRS) BTTERY OPERTION NO SHIELDING Battery Life vs. Load Resistance FILTER INPUT VOLTGE 1Vp-p Vp-p Vp-p C LINE OPERTED f c BTTERY OPERTION SHIELDED ENCLOSURE 1K K K FREQUENCY HZ V in = 1KHZ Sine - f >>f T = C c in NOTE: THE TIME SCLE IS PLOTTED FROM THE TIME WHEN THE POWER INDICTOR FLSHES. THE FILTER CN BE OPERTED BOUT NOTHER 3 MIN. T REDUCED SIGNL. V/ HZ 1K K k LOD Ω 1x - 1x -6 1x -7

10 Model 9 Specification ( C and Vs ± 1 Vdc) Model 9 INSTRUMENT ORDERING GUIDE. CHSSIS 1. 9C Standard C powered chassis 1. 9B C powered, with battery powered option 1 FILTER TRNSFER FUNCTIONS VILBLE,4 B. LOW-PSS BUTTERWORTH 1. 9L4B 4-pole Butterworth. 9LB -pole Butterworth BESSEL 3. 9L4L 4-pole Bessel 4. 9LL -pole Bessel ELLIPTIC. 9LE -pole elliptic, 1.77, db 6. 9LEY -pole elliptic,., db CONSTNT DELY 7. 9LD -pole constant delay, db. 9LD -pole constant delay, db Pin-Out and Package Data Ordering Information C. HIGH-PSS BUTTERWORTH 1. 9H4B 4-pole Butterworth. 9HB -pole Butterworth ELLIPTIC 3. 9HE -pole elliptic, 1.77, db 4. 9HEY -pole elliptic,., db To order, simply specify the chassis style and filter model number that incorporates the desired features. Ordering Information Filter Type L - Low-Pass H - High-Pass Chassis Style 1 C - Standard C Power B - C Powered, with Battery Power Option 9C/9LL Transfer Function 3 B - Butterworth L - Bessel D - constant delay (-db) D - constant delay (-db) E - elliptic 1.77 (-db) EY - elliptic. (-db) No. of Poles 4 NOTE: 1. See page 14, Item S - Voltage Select Switch: t time of shipment, voltage select switch is preset in the 1 Vac position. For Vac operation, this switch must be rotated to the Vac position.. Individual filter modules can be purchased for field replacement. 3. ll models tunable from.1 Hz to 49.9 khz. 4. See page for Filter Replacement Instructions. We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements, recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright. IN-9-

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