Servicing
Analog Output Adjustment
Thermo Electron Corporation Model 48i Instruction Manual 7-29
7. 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 Adjustment” procedure that
follows.
Analog Output
Adjustment
Use the following procedure to adjust the analog voltage outputs if a meter
reading in the “Analog Output Testing” procedure differed by more than
one percent.
1. Connect a meter to the channel to be adjusted. Figure 7-14 shows the
analog output pins and Table 7-3 identifies the associated channels.
2. From the Main Menu, press to scroll to Service > press >
to scroll to Analog Output Calibration > and press .
The Analog Output Cal screen displays
If the Service Mode is not displayed on the Main Menu, use the
following procedure to display it.
a. At the Main Menu, press to scroll to Instrument Controls >
press > to scroll to Service Mode > and press .
The Service Mode screen displays.
b. Press to toggle the Service Mode to ON.
c. Press > to return to the Main Menu.
d. Continue the procedure at Step 2.
3. At the Analog Output Cal screen, press to scroll to the channel
(Voltage Channel 1-6) corresponding to the rear panel terminal pin
where the meter is connected, then press .
The Analog Output Cal: screen displays.
4. With the cursor at Calibrate Zero, press .
The Analog Output Cal: line displays Zero
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