Cryo-con Model 24C
Front Panel Menu Operation
Display Time Constant
Enumeration, Default: 2 Seconds
The
Display TC
field is used to set the display time-constant. This is an enumeration
field that sets the time constant used for all temperature displays. Choices are 0.5,
1.0, 2.0, 4.0, 8.0, 16.0, 32.0 and 64 Seconds.
The time-constant selected is applied to all channels and is used to smooth data in
noisy environments. The filtering only applies to displayed data; it is not used by the
control loops.
Display Resolution
Enumeration, Default: 3
The Display Resolution line (
Display Res
) is used to set the temperature resolution of
the front panel display. Settings of 1, 2 or 3 will fix the number of digits to the right of
the decimal point to the specified value. A setting of FULL will left-justify the display to
show maximum resolution possible.
Note that the Display Resolution setting only formats the display as a user
convenience. The internal resolution of the Model 24C is not affected by this setting.
Synchronous Filter Configuration
Numeric Entry Default: 7
The Synchronous Filter is used to subtract synchronous noise from the input channel.
An example of synchronous noise is the thermal signature of a cryocooler.
The default value of 7 taps is used for a line-frequency synchronous cryocooler.
Values go from 1 (off) to 25 taps with 25 corresponding to 2.5 seconds of filtering.
This is an advanced setup function. Unless you are familiar with the synchronous
noise source that you are trying to remove, leave this field at its default value of 7.
When the number of taps is changed, the control loops will have to be re-tuned
because this filter affects the PID values.
AC Line Frequency Selection
Enumeration, Default: 60Hz
Select the AC power line frequency. Choices are 50 or 60 Hz. This function only
affects the operation of the Synchronous Filter described above.
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