9150
User's Guide
6-2
Heater Voltage Switch - To be used only when changing the input voltage. (See
Section 7.2 for instructions.)
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
operated to provide cooling for the instrument. Slots at the top and sides of the
calibrator are provided for airflow. The area around the calibrator must be kept
clear to allow adequate ventilation. The airflow is directed upward and can be
extremely hot.
6.2 Front
Panel
The front panel consists of the controller display and the controller keypad as
shown in Figure 2.
fig-2.eps
Figure 2. Front Panel
Controller Display - The digital display is an important part of the temperature
controller because it not only displays set and actual temperatures but also dis-
plays various calibrator functions, settings, and constants. The display shows
temperatures in units according to the selected scale °C or °F.
Controller Keypad - The four button keypad allows easy setting of the set-point
temperature. The control buttons (SET, DOWN, UP, and EXIT) are used to set
the calibrator temperature set-point, access and set other operating parameters,
and access and set calibration parameters.
Setting the control temperature is done directly in degrees of the current scale. It
can be set to one-tenth of a degree Celsius or Fahrenheit.
The functions of the buttons are as follows:
SET – Used to display the next parameter in the menu and to store parameters
to the displayed value.
DOWN – Used to decrement the displayed value of parameters.
UP – Used to increment the displayed value.
EXIT – Used to exit from a menu. When EXIT is pressed any changes made to
the displayed value are ignored.
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