Performance Tests
4-68
TDS7104 & TDS7054 Service Manual
H Enter the time on the test record.
3. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (time range >520 ns):
a. Set upper and lower limits that ensure triggering at 250 kHz:
H Touch Upper Limit. Use the keyboard to set the upper limit to 4 s.
H Touch Lower Limit. Use the keypad to set the lower limit to 500 ns.
b. Display the test signal:
H Set the Horizontal SCALE to 4 s.
H 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).
H Press PUSH TO SET LEVEL 50%.
c. Check against limits: Do the following subparts in the order listed.
H Use the multipurpose knob to increase the Lower Limit readout
until triggering is lost.
H CHECK that the Lower Limit readout, after the oscilloscope stops
triggering, is within 1.9 sto2.1s, inclusive.
H Enter the time on the test record.
H Use the keypad to return the Lower Limit to 500 ns and reestablish
triggering.
H Touch Upper Limit; then use the multipurpose knob to slowly
decrease the Upper Limit readout until triggering stops.
H CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 1.9 sto2.1s, inclusive.
H Enter the time on the test record.
4. Disconnect the hookup: Disconnect the cable from the generator output at
the input connector of CH 1.
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