Lake Shore Model 325 Temperature Controller User’s Manual
Operation
4-7
Diode Sensor Input Setup
– 1 mA Excitation Current (Continued)
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 Section 4.5.1 to select a temperature curve or press the
Escape
key
to return to the normal display.
4.4.3
Resistor Sensor Input Setup
Resistor sensors include the Platinum, Rhodium-Iron, and various NTC RTD sensors (e.g., Cernox, Rox, Thermox)
detailed in Table 4-1. More detailed specifications are provided in Table 1-2. Input range is fixed to type of sensor. The
excitation current applied by the Model 325 is determined by the user selection of Negative Temperature Coefficient
(NTC) = 10 µA or Positive Temperature Coefficient (PTC) = 1 mA.
To setup a resistor sensor input, 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 NTC RTD
Use the
s
or
t
key to cycle through the sensor types shown in Table 4-1, with “100
Plat/250,” “100
Plat/500,”
“1000
Plat,” and “NTC RTD” being the relevant choices. Press the
Enter
key.
Содержание 325
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