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TDS 684A, TDS 744A, & TDS 784A Service Manual
4–59
Check output
Figure 4–20: Measurement of Main Trigger Out Limits
d. Check Delayed Trigger output against limits: See Figure 4–20.
H Move the precision 50 W cable from the rear-panel Main Trigger
Output BNC to the rear-panel Delayed Trigger Output BNC.
H CHECK that the Ch2 High readout is ≥1.0 volt and that the Ch2
Low readout ≤0.25 volts.
H Enter high and low voltages on test record.
H Press the side-menu button W to select the 1 MW setting.
H Press CLEAR MENU.
H CHECK that the Ch2 High readout is ≥2.5 volts and that the Ch2
Low readout is ≤0.7 volts.
H Enter high and low voltages on test record.
3. Confirm CH 3 output is within limits for gain:
a. Measure gain:
H Move the precision 50 W cable from the rear-panel DELAYED
TRIGGER OUTPUT BNC to the rear-panel SIGNAL OUT BNC.
H Push TRIGGER MENU.