Performance Tests
4- 100
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
Set upper
and lower
limits that
ensure
triggering.
Then change
limits until
triggering
stops.
Figure 4- 26: Measurement of time accuracy for pulse and glitch triggering
2. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (1 ns < time range >1 s):
a. Set upper and lower limits that ensure triggering at 100 MHz: See
Figure 4--26.
H Press the front-panel ADVANCED button and select the AEvent
tab; then pull down on Trigger Type and select width triggering.
H Pull down P ulse Width and select Inside limits.
H Touch Upper Limit. Use the keyboard to set the upper limit to
10 ns.
H Touch Lower Limit. Use the keypad to set the lower limit to 2 ns.
b. Display the test signal:
H Set the Horizontal SCALE to 20 ns.
H Set the output of the sine wave generator for a 100 MHz,
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 While doing the following subparts, monitor the display (it will stop
acquiring) and the front-panel light TRIG’D (it will extinguish) to
determine when triggering is lost.
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