User guide

Heater Voltage Switch - To be used only when changing the input voltage.
(See Section 6.2 for instructions on changing the input voltage.)
NOTE: The input voltage and heater voltage switch settings should al
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ways be the same value.
Serial Port - A DB-9 male connector is present for interfacing the calibrator to
a computer or terminal with serial RS-232 communications.
Fan - The fan inside the calibrator runs continuously when the unit is being op
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erated to provide cooling for the instrument. It has two speeds, a slow speed for
control operation and a faster speed for rapid cooling. Slots at the top and
around the two corners of the calibrator are provided for airflow. The area
around the calibrator must be kept clear to allow adequate ventilation. The air
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flow is directed upward and can be extremely hot.
5.2
Front Panel
Figure 3 on page 16.
Controller Display - The digital display is an important part of the temperature
controller because it not only displays set and actual temperatures but also vari
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ous calibrator functions, settings, and constants. The display shows tempera
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tures in units according to the selected scale °C or °F.
9141 Dry-well Calibrator
User’s Guide
16
Figure 3 9141 Front Panel