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08481-90049
HP 8481A/82A/83A
Figure 5. Operational Amplifier
The troubleshooting information is intended to first isolate the Power
Sensor or power meter as the defective component. When the Power
Sensor is isolated, troubleshooting information is intended to identify
A1 Bulkhead Assembly or A2 Input Amplifier Assembly as the defective
component.
Before you open the Power Sensor to continue with the troubleshooting
procedures, try the subsitution method of elimination. Use another
Hewlett-Packard power meter, known to be in good operating condition,
with the suspected power sensor and cable. If the same problem occurs
with the "known good" power meter, substitute a "known good" power
sensor cable.
Troubleshooting should be performed with the Power Sensor opened,
the printed circuit board exposed. See "Disassembly" close to the end
of this manual.
When a failed assembly has been identified, go to "Repair" directly
following "Troubleshooting".
Troubleshooting
Excessive power will damage the thermocouples.
Caution
«
Power Meter
To ensure the power meter is providing the correct 220 Hz signal, check
the following levels of the square wave with an oscilloscope.
At the white-black wire: —0.05 ±0.05 Vdc (top of square wave).
At the white-brown wire: —9.0 Vdc (bottom of square wave).
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