Tektronix TAS 475 - Figure 4-14: Trigger Sensitivity Test Setup Three

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Performance Tests
21. Press the TRIGGER MENU button and set MODE to Trig After .
22. Press the SET LEVEL TO 50% button and confirm a stable delayed
sweep display.
23. Set
SLOPE to Falling.
24. Press the SET LEVEL TO 50% button and confirm a stable delayed
sweep display.
25. Press the HORIZONTAL MENU button and set DELAY to Off.
High Frequency - The following steps check trigger sensitivity at
150 MHz (TAS 475) or 250 MHz (TAS 485).
1. Remove the 1 OX attenuator from the test setup. Reconnect as shown in
Figure 4-14.
Sine Wave Generator
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Precision Cable J '" 50 Q Termination
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Figure 4-14: Trigger Sensitivity Test Setup Three
2. Set the sine wave generator frequency as follows:
• TAS 475 -150 MHz
• TAS 485 - 250 MHz
3. Press the MAG button.
4. Set the volts/div scale to 50 mV.
5. Adjust the sine wave generator amplitude as follows:
• TAS 475 - adjust for a one division display
• TAS 485 - adjust for a 1.5 division display
6. Press the SET LEVEL TO 50% button and confirm a stable display.
7. Set SLOPE to Rising.
8. Press the SET LEVEL TO 50% button and confirm a stable display.
9. Press the MAIN/DELAY SELECT button (selecting delay).
10. Press the SET LEVEL TO 50% button and confirm a stable delayed
sweep display (see the following note) .
TAS 475 and TAS 485 Service Manual
4-27
Scan by Zenith