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Performance Tests
4–62
TDS 684A, TDS 744A, & TDS 784A Service Manual
H Select 128 averages.
2. Confirm that the Probe Compensator signal is within limits for frequency:
a. Measure the frequency of the probe compensation signal:
H Press MEASURE; then press the main-menu button Select
Measrmnt for Ch1.
H Repeatedly press the side-menu button –more– until Frequency
appears in the side menu (its icon is shown at the left). Press the
side-menu button Frequency.
b. Check against limits:
H CHECK that the CH 1 Freq readout is within 950 Hz to 1.050 kHz,
inclusive. See Figure 4–22.
H Enter frequency on test record.
H Press MEASURE; then press the main-menu button Remove
Measrmnt for Ch1. Press the side–menu Measurement 1.
Figure 4–22: Measurement of Probe Compensator Frequency
c. Save the probe compensation signal in reference memory: