Lake Shore Model 331 Temperature Controller User’s Manual
5.2.1 Edit
Curve
The Edit Curve operation is used to enter a new curve or edit an existing user curve. Only user
curves (21 to 41) can be changed. Standard curves can only be viewed with the edit operation.
Entering the identification parameters associated with the curve is as important as entering the
breakpoints. Curve header parameters are listed in Table 5-1. Typical parameters for common
sensors are listed in Table 5-2. Read this section completely and gather all necessary data before
beginning the process.
NOTE:
If the curve you wish to enter has similar parameters to an existing curve, first
copy the similar curve (as described in Paragraph 5.2.3) to a new location, then
edit the curve to the desired parameters.
To enter a new user curve or edit an existing user curve, press the
Curve Entry
key. Press the
s
or
t
key until you see the following display.
Select With °®
Edit Curve
Press the
Enter
key. Press the
Escape
key anytime during this routine to return to the normal
display.
Select for Edit °®
Curve 21 User
Use the
s
or
t
key to cycle through the various curves. Curve numbers 21 thru 41 are used to copy
or create new curves. You can also view (but not modify) the standard curve numbers 01 thru 20 from
here. For this example, we will enter a new curve in location 21. Press the
Enter
key.
Enter for Curve 21
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.
Select for Curv21 °®
Curve Format V/K
Use the
s
or
t
key to cycle through the curve formats: V/K,
Ω
/K, log
Ω
/K, mV/K, where V/K = volts
per kelvin,
Ω
/K = ohms per kelvin, log
Ω
/K = logarithm of the resistance per kelvin, and mV/K =
millivolts per kelvin. For this example, we will select V/K. Press the
Enter
key.
Enter for Curve 21
SP Limit 475.00½
Use the numerical keypad to enter a setpoint limit (in kelvin) appropriate for the sensor being used.
For this example, we will enter 475.00K. Press the
Enter
key.
View for Curve 21
Temp Coeff Positive
5-4
Advanced Operation
