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Analog Output Testing
Thermo Fisher Scientific
6. Reinstall the mass flow controllers.
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.
analog output pins and
2. From the Main Menu, press
>
to scroll to Test Analog Outputs, and press
The Test Analog Outputs screen appears.
3. Press
to scroll to the channel corresponding to the rear panel
terminal pins where the meter is connected, and press
The Set Analog Outputs screen appears.
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.
Figure 7-7
Table 7-4
identifies the associated channels.
to scroll to Diagnostics, press
Model 146i Instruction Manual
Servicing
Analog Output Testing
shows the
.
.
7-19
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Troubleshooting
