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Servicing
Ambient Temperature Calibration
Ambient Temperature
Calibration
7-32
Model 48i Trace Level-Enhanced Instruction Manual
Use the following procedure to calibrate the ambient internal temperature
for the instrument.
Equipment Required:
Calibrated thermometer or 10K ohm ±1% resistor
WARNING The service procedures in this manual are restricted to qualified
service representatives.
If the equipment is operated in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.
▲
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground antistatic wrist strap must
be worn while handling any internal component.
1. Remove the instrument cover.
2. Tape the thermistor
Note Since the thermistors are interchangeable to an accuracy of ±0.2 °C,
and have a value of 10K ohms at 25 °C, an alternate procedure is to
connect an accurately known 10K resistor to the thermistor input (AMB
TEMP) on the measurement interface board, and enter the temperature
reading.
▲
A 1 °C change corresponds to a ±5% change in resistance, thus this
alternative procedure can be quite accurate as a check; however, it clearly is
not NIST traceable.
▲
3. From the Main Menu, press
to scroll to Temperature Calibration > and press
The Calibrate Ambient Temperature menu appears.
Note If Service Mode is not displayed, refer to
Mode" on page 7-3, then return to the beginning of this step.
▲
(Figure
7–3) to a calibrated thermometer.
to scroll to Service > press
▲
.
"Accessing the Service
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Thermo Fisher Scientific
>
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