Thermo Scientific 5028i, Instruction Manual

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Servicing
Analog Output Testing
7-18 Model 5028
i
Instruction Manual Thermo Fisher Scientific
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.
Figure 7–9 shows the
analog output pins and Table 7–4 identifies the associated channels.
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 “ 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 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 “ Analog Output
Calibration ” procedure that follows.
8. Press to reset the analog outputs to normal.
Analog Output Testing