Thermo Scientific 42i Instruction Manual page 214

Servicing
Analog Input Calibration
Analog Input
Calibration
Calibrating the Input
Channels to Zero Volts
Calibrating the Input
Channels to Full-Scale
7-30 Model 42i Instruction Manual
Use the following procedures to calibrate the analog inputs after replacing
the optional I/O expansion board. These procedures include selecting
analog input channels, calibrating them to zero volts, and then calibrating
them to full-scale using a known voltage source.
Use the following procedure to calibrate the input channels to zero volts.
1. From the Main Menu, press
to scroll to Analog Input Calibration, and press
2. The Analog Input Cal screen displays.
Note If Service Mode is not displayed, refer to
Mode" on page 7-4, then return to the beginning of this step.
3. At the Analog Input Cal screen, press
press .
4. With the cursor at Calibrate Zero, press
The screen displays the input voltage for the selected channel.
5. Make sure that nothing is connected to the channel input pins and
press to calibrate the input voltage on the selected channel to
zero volts.
The screen displays 0.00 V as the voltage setting.
6. Press >
repeat Steps 2 through 4 to calibrate other input channels to zero as
necessary.
7. Continue with the
procedure that follows.
Use the following procedure to calibrate the input channels to full scale by
applying a known voltage to the channels.
to scroll to Service, press
to return to the Analog Input Cal screen and
"Calibrating the Input Channels to
.
"Accessing the Service
▲
to scroll to a channel, and
.
Full-Scale"
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