Agilent Technologies 1153A, Руководство пользователя и обслуживания

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29
Service
Probe troubleshooting
5
Repeat steps 3 and 4 with the probe connected to the test board in the position
shown in the figure below (signal to - input).
If the probe output cable is unterminated, or the coax is open, the output signal will be
about twice the amplitude of the input signal.
Figure 3-2
Signal to - input
6
Connect the probe to the test board in the differential mode position shown in
the figure below (signal to both inputs).
Figure 3-3
Signal to both input
7
Check for zero output at the solder connection where the probe cable attaches
to the probe pc board.
8
If any of the signals observed in step 3 through 7 are incorrect, check the power
supply voltages from the Infiniium oscilloscope. Refer to “To check probe
power outputs” in the Troubleshooting chapter of the service guide for the
Infiniium oscilloscope.
9
If these power supply voltages from the Infiniium oscilloscope are correct,
repair the probe by replacing the probe pc assembly A1 (refer to the
Replaceable Parts table).
10
If the output at the solder connection where the probe cable attaches to the
probe pc board is correct but the output to the Infiniium oscilloscope is not
correct, repair the probe by replacing the probe cable assembly W1 (refer to
the Replaceable Parts table).