3. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (time range≥1 μs):
a. Set upper and lower limits that ensure triggering at 250 kHz:
■
Touch Upper Limit. Use the keypad to set the upper limit to 4 μs.
■
Touch Lower Limit. Use the keypad to set the lower limit to 500 ns.
b. Display the test signal:
■
< 4 GHz models: Set the Horizontal Scale to 5 μs.
■
≥ 4 GHz models: Set the Horizontal Scale to 4 μs.
■
Set the Vertical Scale to 100 mV.
■
Set the output of the sine wave generator for a 250 kHz, five-division
sine wave on screen. Set the Vertical Scale to 20 mV (the waveform
will overdrive the display).
■
Press PUSH-SET 50%.
c. Check against limits: Do the following subparts in the order listed.
■
≥ 4 GHz models: Press the multipurpose knobs until Fine is on.
■
Use the multipurpose knob to increase the Lower Limit readout
until triggering is lost.
■
CHECK that the Lower Limit readout, after the instrument stops
triggering, is within the following limits:
Model Limit
< 4 GHz models 1.9 μs to 2.1 μs, inclusive
≥ 4 GHz models 1.9 μs to 2.1 μs, inclusive
■
Enter the time on the test record.
■
Use the keypad to return the Lower Limit to 500 ns and reestablish
triggering.
■
Touch Upper Limit; then use the multipurpose knob to slowly
decrease the Upper Limit readout until triggering stops.
■
CHECK that the Upper Limit readout, after the instrument loses
triggering, is within the following limits:
Model Limit
< 4 GHz models 1.9 μs to 2.1 μs, inclusive
≥ 4 GHz models 1.9 μs to 2.1 μs, inclusive
■
Enter the time on the test record.
4. Disconnect the hookup: Disconnect the equipment from the instrument.
Performance verification (MSO/DPO70000C, MSO/DPO70000DX, and DPO7000C series)
256 MSO70000C/DX, DPO70000C/DX, DPO7000C, MSO5000/B, DPO5000/B Series