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Troubleshooting
Troubleshooting
Use the following paragraphs to assist in troubleshooting problems with the 1141A/1142A
Differential Probe.
Probe Troubleshooting
To troubleshoot the probe:
1
Apply a known signal to the input of the probe.
2 Check for an identical output at the output coax to the cable. This connection
is the one soldered to the PC board. If the probe output cable is not terminated,
or the coax is open, the output signal will be about twice the amplitude of the
input signal.
3 If the signal is incorrect, check the power supply voltages from the 1142A Probe
Control and Power Module. Use the cable diagram on the next page.
4 Troubleshoot the cable with an ohmmeter. Use the cable diagram on the next
page.
Probe Control and Power Module
Troubleshooting
The circuitry consists of simple power supplies, operational amplifiers, and TTL. Use
conventional troubleshooting techniques. A complete parts list, component locator, and
schematics are provided later in this chapter.