MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
5
482A21 and 482A22 Troubleshooting Guide
Problem
Test/Solution
Unit does not appear to be powered
up/ No meter movement.
- Power switch in the on position.
- Test ‘sensor’ excitation current. Measure the current on the ‘sensor’ input
BNC from the center conductor to the shell. Adjust ‘Iadj’ (rear panel) with
screwdriver turning both clockwise and counterclockwise. Reference section
‘Setting the Constant Current.’
- Make sure the bias monitor channel select matches the channel of interest.
Output signal seems to drift.
- Make sure the input impedance of the readout device, scope or data
acquisition system is approximately 1 MΩ.
Low frequency response not meeting
specification
or
amplitude
is
attenuated.
- The input impedance of the readout device may be too low. May need to use a
buffered signal conditioner, for example 482C16.
Meter does not seem to show sensor
bias voltage.
- Match the channel select with channel of interest.
- Measure the sensor bias while the sensor is attached to the unit. This requires
a ‘T’ connector to allow both the sensor and the measuring device to be
attached. If problem persists, return for repair.
MANUAL NUMBER: 19179
MANUAL REVISION:
ECO NUMBER:
