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5.7.5 Sinewave Generator Checks
Check the MB-board circuits that supply the test
signals to the OUT, as follows.
1. Perform the zeroing procedure (both open
circuit and short circuit), as described in para-
graph 5.9.2 of the recalibration procedure.
2. Make the following test setup and keyboard
selections.
[FUNCTION] - MEASURE
[DISPLAY] - VALUE
[MEASURE RATE] - SLOW
[MEASURE MODE] - CONT.
[EQUIVALENT CIRCUIT] – SERIES
3. Install a 10 kilohm resistor as the DUT.
4. Use an oscilloscope to verify that the signal
at the right-hand end of the DUT in the test
fixture is a sine wave, as follows . (For scope
ground return, connect to the ground plane
on the circuit board or via a 6-32 screw to
the tapped hole in the left-hand end of the
test fixture.)
Frequency: 1 kHz,
Amplitude: approx 1.5 Vpk-pk,
Table 5-4: Detector (standard) resistor range switching checks
Service and Maintenance
Table 5-3: Source range switching checks
5.7.6 Front End Amplifiers and
Switches
If a discrepancy is found, check similarly at the R-Std
signal check point - as described in Table 5-4. The
signal should be the same as listed in step 4 above for
U59 pin 14, for the particular DUT and range.
1693 RLC Digibridge
129
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