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Performance Tests
4–50
TDS 684A, TDS 744A, & TDS 784A Service Manual
c. Read results (Check against limits): See Figure 4–16.
H CHECK that the Level readout in the main menu is within 9.863 V
to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
H Press the main-menu button Slope; then press the side-menu button
for negative slope. See icon at left. Repeat substep b.
H CHECK that the Level readout in the main menu is within 9.863 V
to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to
10.1147 V, inclusive, for the TDS 7XXA.
H Enter voltage on test record.
Set DC calibration generator
to equal offset (+10 V).
2
Set vertical position to –3 divs.
Set vertical offset to +10 volts.
1
Read results.
3
Figure 4–16: Measurement of Trigger-Level Accuracy
3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold
accuracy:
a. Select the Delayed time base: