AE Agricultural Customer Services Play-by-Play Tekscope Manual

Transcription

1 AE Agricultural Customer Services Play-by-Play Tekscope Manual TABLE OF CONTENTS I. Definitions II. Waveform Properties 1 III. Scientific Notation... 2 IV. Transient Levels of Concern a. ASAE Paper Number Graph. 3 b. Conservative Table of Interpreted Values of Reinemann s Graph... 3 c. Behavioral Response for 5% Most Sensitive Cows. 3 V. TEKSCOPE settings as suggested for Ag Rep Play-by-Play 6 Store a setting as USER 2 6 Overview of Steps 1. RESET to factory default 6 2. VERTICAL 7 3. HORIZOTAL 9 4. TRIGGER 10 MENUS 11 Save current setup 12 Recall current setup 13 Capturing a transient event 14 Display and Hold a transient on the Screen 14 Saving Waveform displayed on the Screen 15 Recall a Saved Waveform 16 Transferring a Waveform to computer from Tekscope using Waveform Manager 17 Auto Range 22

2 Voltage Introduction The Tekscope is a hand held digital oscilloscope. It is intended to be used to measure both the power line frequency and higher frequency components of steady state and transient voltages that may be present in the cow contact area. Definitions Waveform: The path traced by the voltage and plotted as a function of time. Instantaneous Value: The magnitude of the waveform a any instant in time. The magnitude is obtained from the vertical axis. This value can be obtained from interpreting it from the volts/div setting or use of the cursors function of the Tekscope. Periodic Waveform: A waveform that continually repeats itself in regular intervals. ie: 60Hz contribution in the cow contact area. Period (T): The time between regular intervals. Cycle: The portion of a waveform contained in one period. Frequency (f): The number of cycles in one second measured in Hertz (Hz). Figure mS/div 500mV/div One period (T) Time 1Hz (Hertz) = 1c/s (cycle per second) T = 1/f or f =1/T T = one period measured in seconds f = frequency measured in Hertz Example

3 2 One period at 60Hz 16.67ms 1/60Hz.01667s and 1/.01667s 60Hz Note: For a clean sine wave, the AC rms value of the waveform is the peak value divided by the square root of 2. In Figure 1 the maximum value (or peak value) of the waveform is 0.707V the ACrms value is 0.50V Scientific Notation Prefix Abbreviation Power of 10 Nano n = 10-9 Micro = 10-6 Milli m = 10-3 Kilo k 1000 = 10 3 Mega M = 10 6 Giga G =10 9 If one has a unit with a prefix and wishes to remove the prefix (ie: millisecond to seconds), multiply by the power of 10. To add a prefix to a unit (ie: volts to millivolts), divide by the power of 10. Examples 0.026V (volts).026 X mV (millivolts) 16.67ms (milliseconds) X s (seconds)

4 Voltage (Zero to Peak) 500 Ohm Cow Contact 3 TRANSIENT LEVELS OF CONCERN The following table is interpreted from ASAE Paper Number Effects of Frequency and Duration on the Sensitivity of Dairy Cows to Transient Voltages by Reinamann etal. Phase Duration 600 Hz = 835 sec 6,000 Hz = 83.5 sec 60,000 Hz = 8.35 sec Phase duration is the time between zero crossings Phase Duration Tp ( sec) Threshold Voltage* Vt (Peak V) Threshold Current It (Peak ma) < *Across 500 resistor 10,000 1,000 Behavioral response for 5% most sensitive cows, sine waves muzzle to hooves exposure Fencers 1 cycle Biphasic 1 cycle Monophasic Multi Cycle Phase Duration (microseconds) = time between zero crossings Reinemann (Reinemann 2002)

5 4 Overview of Steps Goal: Want to have a common setting that can be recalled by any ag rep for comparison to other reps measurements. Listed is an overview of what this setup will provide: This basic setup will provide a 20 second rolling view on the Tekscope. o The Tekscope will detect single pulses as low as 2 Microseconds but will not identify duration without changing the time on the horizontal axis. Triggering will not be needed for the 20 second view but will be needed when set at or below 200ms SEC/DIV on horizontal axis. If the capture of a specific event is desired, just decrease the Horizontal SEC/DIV to 200ms or less and use RUN/STOP button to reset trigger (no change of Acquire is necessary). TEKSCOPE settings as suggested for Ag Rep Italic is what you need to change SAVE/RECALL Step 1 Recall Factory Setup Step 2 OK Recall Setup Step 3 VERTICAL Changes below. If not listed, the factory setting is same. Display CH1 and turn all other waveforms off. MENU Coupling = AC Change from DC to AC Invert = Off Bandwidth = Full Position = 0 div Probe type = 1x Change from 10x to 1x with toggle Set VOLTS/DIV = 2V Change HORIZONTAL Set SEC/DIV to 2 S Change MENU Time Base = Main Trigger Position = 10% Change from 50% to 10% TRIGGER MENU Type = Edge Source = Ch 1 Coupling = DC Slope = positive Mode = Auto & Holdoff MENUS: ACQUIRE Mode = Pk Detect Change to Pk Detect Stop After Single Sequence Change to Stop After Single Sequence

6 5 MENUS: MEAS Select Measurement for Ch 1 Pk-Pk OK Select Measurement Change Change MENUS: SAVE/RECALL Step 1 Save Current Setup Step 2 To Setup 2 user Step 3 OK Save Group Step 4 TO RECALL this setting can be recalled by: SAVE/RECALL Recall Saved Setup Recall Setup 2 user If the capture of a specific event is desired, just decrease the Horizontal SEC/DIV to 200ms or less (no change of Acquire is necessary), and adjust the trigger level.

7 6 Play-by-Play Store a setting as user 2 Overview of Steps: Reset to factory default (If you want to save your own settings, save to user 3). Change settings to common set up for VERTICAL, HORIZONTAL, TRIGGER, and MENUS. Save settings so that setup can be recalled at any time. 1. RESET to factory default SAVE/RECALL Step 1 Recall Factory Setup Step 2 OK Recall Setup Step 3 TRIGGER LEVEL Pushing CLEAR MENU will clear the display of the settings being changed. Italic is what you need to change from the factory setting to set up user 2

8 7 2. VERTICAL- Changes below. If not listed, the factory setting is same. Set VOLTS/DIV = 2V Change Display CH1 and turn all other waveforms off. 3) CH1 on screen 2) Turn on CH1 1) Turn off WAVEFORM

9 MENU Coupling = AC Change from DC to AC Invert = Off Bandwidth = Full Position = 0 div Probe type = 1x Change from 10x to 1x with toggle 8

10 9 3. HORIZONTAL Set SEC/DIV to 2 S Change MENU Time Base = Main Trigger Position = 10%

11 10 4. TRIGGER MENU Type = Edge Source = Ch 1 Coupling = DC Slope = positive Mode = Auto & Holdoff Trigger level can be adjusted and appears as arrow on screen and a number in lower right corner of scope display.

12 11 MENUS ACQUIRE o Mode = Pk Detect Change to Pk Detect o Stop After Single Sequence Change to Stop After Single Sequence \

13 12 SAVE/RECALL o Save Current Setup o To Setup 2 user o OK Save Group Changes user #

14 13 TO RECALL this setting can be recalled by: SAVE/RECALL Recall Saved Setup Recall Setup 2 user Press RUN/STOP HOLD button to start scoll.

15 14 If the capture of a specific event is desired, just decrease the Horizontal SEC/DIV to 200ms or less (no change of Acquire is necessary), and adjust the trigger level. Display and Hold a transient on the Screen TRIGGER Set the TRIGGER LEVEL (the arrow on the right side of the screen) slightly above or below the steady state waveform. MENU Type = Edge Source = Ch 1 Coupling = DC Slope = positive Mode = Auto & Holdoff MENUS: ACQUIRE Mode = Pk Detect Stop After = Single Sequence Previously set Press the HOLD button until RUN: appears in the Status Line. When the input voltage exceeds the trigger level a new waveform will appear on the display, and Hold: will appear in the Status Line. Repeat this procedure until an acceptable waveform is obtained.

16 15 Save Waveform Displayed on the Screen MENU: SAVE/RECALL Save Ch 1 = (an open waveform memory location 1-10; use +/- to change the memory location). Note the Location, Date, and Time when waveform was captured. OK Save Waveform, OK Overwrite Waveform (if want to do this) Waveform is captured as shown below: Save CH 1 Pick # of waveform saved Toggle # using TOGGLE switch OK overwrite waveform WAVEFORM OFF button will clear screen

17 16 Recall a Saved Waveform MENU: SAVE/RECALL Recall Saved Waveform = (From Wfm 1-10; use =/- to change the memory location). Note: Waveforms stored from CH 1 are recalled with REF A, and waveforms stored from CH 2 are recalled with REF B. OK Recall Waveform

18 17 Transferring a Waveform to computer from Tekscope using Waveform Manager Start Waveform Manager Open New Document under File

19 18 Choose TRANSFER WAVEFORMS Edit, then Waveform Window Properties (Ctrl+E)

20 19 Delete {WfmLbl} - {DateStamp /d} and type in Farmname Date Time of Capture Location File title appears Transfer Waveform from Scope

21 20 Tranfer Waveform that you have displayed Waveform is tranfered

22 File, Save Document As. Browse to find folder to save in, name file, and save. 21

23 AUTO RANGE This button will allow the Scope to automatically pick the VERTICAL and HORIZONTAL voltage and time settings. 22