Lake Shore Model 331 Temperature Controller User’s Manual
Keypad Definitions (Continued)
Control Setup
Allows selection of control input, setpoint units, closed or open loop control mode,
power up enable, display of heater output units, setpoint ramp enable, and ramp
rate for the currently selected loop. Refer to Paragraph 4.7 for control setup and
Paragraph 4.12 for ramp feature.
Setpoint
Allows entry of control setpoint for the currently selected loop. Refer to Paragraph
4.11. A discussion of the ramp feature is provided in Paragraph 4.12.
Zone Settings
Allows entry of up to 10 temperature control zones of customer-entered PID
settings and Heater Ranges for the currently selected loop. Refer to Paragraph
4.10.
PID/MHP
Allows manual adjustment of control parameters Proportional, Integral, and
Derivative, or Manual Heater Power (MHP) output for the currently selected loop.
Refer to Paragraph 4.8.
Input Setup
Allows selection of sensor input type and curve. Refer to Paragraph 4.4 for sensor
input setup and Paragraph 4.5 for curve selection.
Curve Entry
Allows entry of up to twenty 200-point CalCurves or user curves and SoftCal.
Refer to Chapter 5 – Advanced Operation, Paragraph 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 Paragraphs 4.1.4 and 4.3. Press and hold to set display
brightness. Refer to Paragraph 4.18.
Math
Allows the user to configure the math features: Max/Min, linear equation, and filter.
Press twice to reset the stored Max/Min readings. Refer to Paragraph 4.14.
Alarm
Allows the user to configure both the alarms and relays (331S Only). Refer to
Paragraph 4.15.
Analog Output
Allows the user to configure the analog output feature. Also used to assign the
analog output to Loop 2 control output thus enabling Loop 2 (331S Only). Refer to
Paragraph 4.16.
Remote/Local
Sets remote or local operation: Remote refers to operation is via IEEE-488
Interface (Model 331S only); Local refers to operation via the front panel. Refer to
Paragraph 4.19.
Interface
Sets the Baud rate of the serial interface and IEEE-488 address and terminators
(331S Only). Refer to Paragraph 4.20.
s
Serves two functions: chooses between parameters during setting operations and
to increment a numerical parameter values.
t
Serves two functions: chooses between parameters during setting operations and
decrements numerical parameter values.
Escape
Terminates a setting function without changing the existing parameter value. Press
and hold to reset instrument to default values. Refer to Paragraph 4.21.
Enter
Completes setting functions and returns to normal operation. Press and hold to
lock or unlock keypad. Refer to Paragraph 4.17.
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 Paragraph 4.1.3.
4-2
Operation
