Lake Shore Model 331 Temperature Controller User’s Manual
4.4.2 Diode Sensor Input Setup – 1 mA Excitation Current
As an alternative to the standard diode input configuration listed above, the user may select 1 mA
excitation while the input configuration matches the diode input setup as detailed in Table 4-1. Input
ranges are fixed to 0
– 2.5 V and 0 – 7.5 V.
To access the alternative setup, the diode current must be set to 1 mA. Press and hold the Input
Setup
key for 10 seconds to display the screen shown as follows:
Select for InputA °®
Diode Current 1mA
Use the s or t key to toggle between 10 µA and 1 mA to select the diode current for Input A. 1 mA
must be selected for the special sensor input to be available for Input A. Press the
Enter key.
Select for InputB °®
Diode Current 1mA
Use the s or t key to toggle between 10 µA and 1 mA to select the diode current for Input B. 1 mA
must be selected for the special sensor input to be available for Input B. Press the
Enter key.
To setup the diode input using 1 mA excitation, press the Input Setup key. The first screen appears
as follows.
Select With °®
Input Setup Input A
Use the s or t key to toggle between Input A and B. Press the Enter key.
Select for InputA °®
Type 2.5V, 1mA
Use the s or t key to cycle through the sensor types shown in Table 4-1, with “2.5V, 1mA” and
“7.5V, 1mA” being the relevant choices. Press the
Enter key. Proceed to Paragraph 4.5.1 to select a
temperature curve or press the
Escape key to return to the normal display.
4-8 Operation
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