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Analog Output
Testing
Thermo Fisher Scientific
The analog outputs should be tested if the concentration value on the front
panel display disagrees with the analog outputs. To check the analog
outputs, you connect a meter to an analog output channel (voltage or
current) and compare the meter reading with the output value displayed on
the Test Analog Outputs screen.
Equipment Required:
Multimeter
Use the following procedure to test the analog outputs.
1. Connect a meter to the channel to be tested. Figure 7–12 shows the
analog output pins and Table 7–4 identifies the associated channels.
2. From the Main Menu, press
>
to scroll to Test Analog Outputs, and press
The Test Analog Outputs screen displays.
3. Press
to scroll to the desired channel corresponding to the rear
panel terminal pins where the meter is connected, and press
The Set Analog Outputs screen displays.
4. Press
to set the output to zero.
The Output Set To line displays Zero.
5. Check that the meter is displaying a zero value. If the meter reading
differs by more than one percent, the analog outputs should be
adjusted. Refer to the "Analog Output Calibration" procedure that
follows.
6. Press
to set the output to full scale.
The Output Set To line displays Full Scale.
7. Check that the meter is displaying the full scale value. If the meter
reading differs by more than one percent, the analog outputs should be
adjusted. Refer to the "Analog Output Calibration" procedure that
follows.
8. Press
to reset the analog outputs to normal.
to scroll to Diagnostics, press
Model 43i Trace Level-Enhanced Instruction Manual
Servicing
Analog Output Testing
.
.
7-21
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Troubleshooting
