Performance Tests
TDS7104 & TDS7054 Service Manual
4-67
Set upper and lower
limits that ensure
triggering. Then
change limits until
triggering stops.
Figure 4- 30: Measurement of time accuracy for pulse and glit ch triggering
H Touch the Trig When button and select Inside limits.
H Touch Upper Limit and use the keyboard to set the upper limit to
10 ns: press 10, then n,andENTER.
H Touch Lower Limit and use the keypad to set the lower limit to
2ns.
d. Change limits until triggering stops:
H Press PUSH TO SET 50%.
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.
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 loses
triggering, is within 3.5 ns to 6.5 ns, inclusive.
H Enter the time on the test record.
H Use the keypad to return the Lower Limit to 2 ns and reestablish
triggering.
H Touch Upper Limit; then use the multipurpose knob to slowly
decrease the Upper Limit readout until triggering is lost.
H CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 3.5 ns to 6.5 ns, inclusive.
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