HP 437B - POWER SENSOR DETECTION CIRCUITRY TROUBLESHOOTING

HP 437B
Service Sheet BD1
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10 ms/DIV
Figure 8-12. A4TP14 Ramp End Waveform
Service Sheet A4c Troubleshooting
23. Set the oscilloscope’s vertical sensitivity to 5.0V/div.
24. Repeat Steps 12 through 16 of the Analog Board Functional
Verification procedure (checking the RECORDER OUTPUT signal).
25. Repeat Steps 18 through 22 of the Analog Board Functional
Verification procedure (checking the POWER REF signal).
Power Sensor Detection Circuitry Troubleshooting
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The following steps need to be performed only if the Power Meter indicates
Note {2
sensor problems. For example:
a. The Power Meter displays "NO SENSOR" when a sensor is attached.
b. The Power Meter does not display "NO SENSOR" when a sensor is not
attached.
c. The Power Meter displays "2 SENSOR ERR" when only one sensor or
no sensor is attached (Option 002 or 003 only).
d. The Power Meter is operating in the wrong power range for the
attached sensor.
1. Connect the oscilloscope to A4TP18.
8-238 SERVICE