Lake Shore Model 331 Temperature Controller User’s Manual
5.3.5
SoftCal Calibration Curve Creation
Once the calibration data points have been obtained, you may create a SoftCal calibration. This
example illustrates SoftCal of a DT-470 Diode. Press the
Curve Entry
key. Press the
s
or
t
key
until you see the following display.
Select With °®
SoftCal
Press the
Enter
key. You can press the
Escape
key anytime during this routine to return to the
normal display.
Select for Scal °®
DT-470
Use the
s
or
t
key to cycle through the sensor type you wish to SoftCal: DT-470, PT-100, and
PT-1000. Once the sensor type is selected, press the
Enter
key. You will see the following message.
Select Write to °®
Curve 21 User
NOTE:
The copy routine allows you to overwrite an existing user curve. Please ensure the
curve number you are writing to is correct before proceeding with curve copy.
Use the
s
or
t
key to select the user curve location where the SoftCal curve will be stored. You can
choose any of the user curve locations, 21 thru 41. Press the
Enter
key. You will see the following
message.
Serial #
0123456789
Use the numerical keypad to enter the applicable sensor serial number; to a maximum of 10 digits.
For this example, we will enter 0123456789. Press the
Enter
key.
Point 1
+1.62999v 04.1800½
NOTE:
If Point 1 is not being used, press the
Enter
key with both settings at their default
value and advance to Point 2.
Use the numerical keypad to enter the measured data point at or near the boiling point of helium
(4.2 K). Temperatures outside the range of 2
–
10 K are not permitted. The message “Invalid Point.
Please Reenter” is displayed if either point is outside the acceptable range. For this example, we will
enter 1.62999. Press the
Enter
key. The cursor will jump to the temperature reading. Again use
numerical keypad to enter the temperature the measurement was taken at. For this example, we will
enter 4.18 K. Press the
Enter
key.
Point 2
+1.02111v 77.0000½
5-10
Advanced Operation
