Lake Shore Model 325 Temperature Controller User’s Manual
5-4 Advanced Operation
Edit Curve (Continued)
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.
Use the s or t key to cycle through the curve formats: V/K, /K, log /K, mV/K, where V/K = volts per kelvin,
/K = ohms per kelvin, log /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.
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.
The temperature coefficient (positive or negative) of the curve is displayed. The coefficient is calculated from the first
two points of the curve and cannot be changed. Press the Enter key.
Now that the curve identification parameters are entered, it is time to enter curve breakpoints.
The cursor initially blinks on the curve breakpoint number. When the cursor is in this position, use the s or t key to
scroll through the breakpoints in the curve. Press the Enter key to modify the current breakpoint. Use the numerical
keypad to enter the applicable sensor value. For this example, we will enter 0.09062V, then press the Enter key. The
cursor will jump to the temperature reading. Again use numerical keypad to enter the applicable temperature in kelvin.
For this example, we will enter 475.0K. Press the Enter key.
Use the numerical keypad to enter the remaining voltage and temperature points. After entering the final point in the
curve, press the Enter key, then the Escape key. You will return to the normal display.
To add a new breakpoint to an existing curve, go to the end of the curve data and enter the new sensor reading and
temperature. Press the Enter key, then the Escape key. The new point is automatically put into its proper place in
breakpoint sequence.
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