Lake Shore Model 325 Temperature Controller User’s Manual
4-2 Operation
Keypad Definitions (Continued)
P Allows manual adjustment of the Proportional control parameter for the currently selected loop. Refer
to Section 4.8.1.
I Allows manual adjustment of the Integral control parameter for the currently selected loop. Refer to
Section 4.8.2.
D Allows manual adjustment of the Derivative control parameter for the currently selected loop. Refer to
Section 4.8.3.
Manual Heater Allows adjustment of the Manual Heater Power setting. Refer to Section 4.8.4.
Input Setup Allows selection of sensor input type and curve. Refer to Section 4.4 for sensor input setup and Section
4.5 for curve selection.
Curve Entry Allows entry of up to fifteen 200-point CalCurves or user curves and SoftCal. Refer to Chapter 5 –
Advanced Operation, Section 5.2 Front Panel Curve Entry Operations.
Display Format Allows the user to configure the display and select the units or other source of the readings. Refer to
Sections 4.1.4 and 4.3.
Remote/Local Sets remote or local operation: Remote refers to operation is via IEEE-488 Interface; Local refers to
operation via the front panel. Refer to Section 4.16.
Interface Sets the baud rate of the serial interface and IEEE-488 address and terminators. Refer to Section 4.17.
s Serves two functions: chooses between parameters during setting operations and to increment a
numerical parameter value.
t Serves two functions: chooses between parameters during setting operations and decrements numerical
parameter value.
Escape Terminates a setting function without changing the existing parameter value. Press and hold to reset
instrument to default values. Refer to Section 4.18.
Enter Completes setting functions and returns to normal operation. Press and hold to lock or unlock keypad.
Refer to Section 4.15.
0 – 9, +/–, . Used for entry of numeric data. Includes a key to toggle plus (+) or minus (–), and a key for entry of a
decimal point. Refer to Section 4.1.3.
4.1.2 Annunciators
Display annunciators are listed as follows:
A or A ... Sensor Input A
B or B .... Sensor Input B
S ............ Setpoint
K......... Temperature in kelvin
C ......... Temperature in degrees Celsius
V......... Sensor units of volts
.......... Sensor units of ohms
mV ....... Sensor units of millivolts
R .......... Remote
If a displayed sensor input channel is being used to control the currently selected Loop, the display annunciator for that
sensor input will be underlined. Refer to Section 4.4.
4.1.3 General Keypad Operation
There are three basic keypad operations: Direct Operation, Setting Selection, and Data Entry.
Direct Operation. The key function occurs as soon as the key is pressed, e.g., Loop, Heater Off, and Remote/Local.
Setting Selection. Allows the user to select from a list of values. During a selection sequence the s or t key are used to
select a parameter value. After a selection is made the Enter key is pressed to make the change and advance to the next
setting, or the Escape key is pressed to return to the normal display without changing the present setting. The instrument
retains any values entered prior to pressing the Escape key. Some selections are made immediately after pressing a
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