Cryo-con Model 24C Front Panel Operation
Temperature Displays
A typical Input Channel Temperature Display is shown on this page. It consists of the
input channel designator, a Temperature reading and the current temperature units.
The temperature, a seven-character field, is affected by the Display Resolution setting
in the System menu. This setting may be 1, 2, 3 or Full. Settings of 1, 2, or 3 indicate
the number of digits to the right of the decimal point to display whereas the Full
setting causes the display to be left justified in order to show the maximum number of
significant digits possible.
The Display Resolution setting does not affect the internal accuracy of arithmetic
operations. It is generally used to eliminate the
display of unnecessary digits that are beyond the
sensor’s actual resolution.
If the Input Channel has been disabled, a blank
display is shown.
Temperature units are selected in the individual
input channel setup menus, ChA , ChB , ChC or
ChD. Temperature Units may be K, C or F.
When Sensor Units (S) is selected, the raw input
readings are exhibited. These will be in Volts or
Ohms.
Sensor Fault Display
A sensor fault condition is identified by a temperature display of seven dash (-)
characters as shown here. The sensor is open, disconnected
or shorted.
Temperature Out of Range Display
If a temperature reading is within the measurement range of the instrument but is not
within the specified Sensor Calibration Curve, a display of
seven dot (.) characters is shown.
i Note: In some cases, there will be an erratic temperature
display when no sensor is connected. This is not an error condition.
The high input impedance of the controller’s input preamplifier
causes erratic voltage values when left unconnected. If an input is
left unconnected, the sensor type should be set to type "None",
which turns the input off.
47
K Kelvin
C Celsius
F Fahrenheit
Ohms
V Volts
Table 16: Temperature Units
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