Lake Shore Model 332 Temperature Controller User’s Manual
3.4.4 Power
Switch
The power switch is part of the line input assembly on the rear panel of the Model 332 and turns line
power to the instrument On and Off. When the circle is depressed, power is Off. When the line is
depressed, power is On.
3.5
DIODE/RESISTOR SENSOR INPUTS
This paragraph details how to connect diode and resistor sensors to the Model 332 inputs. Refer to
Paragraph 4.4 to configure the inputs. The optional thermocouple input is described in Paragraph 3.6.
3.5.1
Sensor Input Connector and Pinout
The input connectors are 6-pin DIN 45322 sockets. The sensor output pins are defined in Figure 3-3.
Two mating connectors (6-pin DIN plugs) are included in the connector kit shipped with the
instrument. These are common connectors, so additional mating connectors can be purchased
from local electronics suppliers. They can also be ordered from Lake Shore (P/N G-106-233).
NOTE:
Pin 3 should not be used for new installations. However, to match existing Model 330
or Model 340 connector wiring, the definition of Pin 3 may be changed with a jumper.
See Figure 8-7 for jumper location.
To provide compatibility with sensor input connectors that have been wired for either Lake Shore
Model 330 or 340 Temperature Controllers, Jumper 4 (for Input A) and Jumper 7 (for Input B) are
used to select the function of Pin 3 of the connectors. The Model 330 provides a constant 1 mA
sensor excitation current on Pin 3 and 10 µA current on Pin 5. The Model 340 provides both 1 mA
and 10 µA excitation current on Pin 5 and connects Pin 3 to sensor ground reference. If the sensor
being used is wired for use with a Model 330, the jumper must be placed in the 330 position (factory
default). This provides the output current selected via the front panel input setup function on both Pins
5 and 3. If the sensor is wired for use with a Model 340, the jumper must be placed in the 340 position
which provides output current on Pin 5 only and connects Pin 3 to sensor ground reference.
I+
I
V
V+
!
Pin Symbol
Description
1 I–
–
Current
2 V–
–
Voltage
3 !
+1 mA – Model 330 Configuration
Shield – Model 340 Configuration
4 V+
+
Voltage
5 I+
+
Current
6 None
Shield
Figure 3-3. Diode/Resistor Input Connector
3.5.2
Sensor Lead Cable
The sensor lead cable used outside the cooling system can be much different from what is used
inside. Between the instrument and vacuum shroud, error and noise pick up need to be minimized,
not heat leak. Larger conductor, 22 to 28 AWG stranded copper wire is recommended because it has
low resistance yet remains flexible when several wires are bundled in a cable. The arrangement of
wires in a cable is also important. For best results, voltage leads, V+ and V– should be twisted
together and current leads I+ and I– should be twisted together. The twisted pairs of voltage and
current leads should then be covered with a braided or foil shield which is connected to the shield pin
3-4
Installation
