Cryo-con Model 24C Front Panel Menu Operation
Temperature Units Enumeration, Default: K
The Temperature Units field (line 1) assigns the units used to display temperature for
the input channel. Options are K for Kelvin, C for Celsius, F for Fahrenheit and S for
sensor units. Note that if the S option is selected, the actual sensor units will be
displayed when the field is deselected. Available sensor units are V for Volts and for
Ohms.
Use the + or 0 key to scroll through all of the options. When the desired units are
displayed, press the Enter key to make the selection. The display will now show the
current temperature with the new units.
Sensor Type Selection Enumeration
Line 2 selects the Sensor type for the input channel. When this field is selected, the
scroll keys are used to scroll through all of the available sensor types. Factory
installed sensors appear first and then user sensors. For a list of both factory and
user sensors, refer to Appendix A.
New user sensor types and calibration curves are added using the Sensors menu.
Setting a Temperature Alarm
The Alarm lines are used to setup alarm conditions. The Model 24C allows alarm
conditions to be assigned independently to any of the input channels.
High temperature and low temperature alarms may be entered and enabled. Note
that a user selected dead-band is applied to the assertion of high and low
temperature alarms.
Alarm conditions are indicated on the front panel by the Alarm LED and various
display fields. They are also reported via the remote interfaces.
When the audible alarm is enabled, a high-pitched buzzer will sound when an alarm
condition is asserted.
The Model 24C supports latched alarms. These are alarms that remain asserted even
after the condition that caused the alarm has been cleared. To clear a latched alarm,
first press Alarm to view the Alarm Status Display and then press the Home key to
clear.
Input Channel Statistics
The Model 24C continuously tracks temperature history on each input channel. The
Input Statistics shown in this menu provides a summary of that history.
The channel history is reset whenever the channel is initialized and can also be reset
by pressing the Enter key while the cursor is on any of the statistics lines.
The Accum line shows the length of time that the channel history has been
accumulating. It is in units of Minutes.
The Minimum and Maximum temperature lines show the temperatures from during
the accumulation time. Values are shown in the currently selected display units.
S2 is the temperature variance, which is computed as standard deviation squared.
The M and b fields display the slope and the offset of the LMS best-fit straight line to
the temperature history data.
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