Thermo Scientific 5028i Instruction Manual page 202

Servicing
Analog Output Testing
Analog Output Testing
7-18 Model 5028i Instruction Manual
e. Cal Vac Pressure Span by entering the actual value from the
reference manometer.
f. Press to save value.
4. Pres/Vacuum Calibration of Channel B has the same process as
Channel A. Need to notice that the manometer should connect to
the ΔPB ports on the rear panel.
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, connect a meter to an analog output channel (voltage
or current) and compare the meter reading with the output value set 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, choose Diagnostics > Test Analog Outputs.
The Test Analog Outputs screen appears.
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 appears.
4. Press to set the output to zero.
The Output Set To line displays Zero.
5. Check that the meter is displaying the zero value. If the meter
reading differs by more than one percent of the full-scale output,
the analog outputs should be adjusted. Refer to the
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 a full-scale value. If the meter
reading differs by more than one percent of the full-scale output,
the analog outputs should be adjusted. Refer to the
Calibration" procedure that follows.
8. Press to reset the analog outputs to normal.
Table 7–4 identifies the associated channels.
Figure 7–9 shows the
"Analog Output
"Analog Output
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