Lake Shore Model 332 Temperature Controller User’s Manual
4.16 ANALOG
OUTPUT
When Control Loop 2 is not being used, its output can be configured as an analog voltage output. When
properly configured the Model 332 has a single analog output on Pins 7 and 8 of the terminal block at
the rear of the instrument. It is normally used to send a voltage proportional to temperature to a strip
chart recorder or separate data acquisition system. The output can also be manually controlled as a
voltage source for any other application. Refer to paragraph 8.7 to configure the output hardware.
The analog output is a variable DC voltage source that can vary from –10 V to +10 V. The voltage is
generated by a 16-bit D/A converter. It is highly recommended that the analog output be configured for
1 W maximum output. When configured for 1 W the following specifications apply. The resolution of the
analog output is 0.3 mV or 0.003% of full scale. The output source impedance is 0.01
Ω
. The output
can source up to 100 mA of current providing a maximum of 1 W of power. It can drive a resistive load
of no less than 100
Ω
. The output is short protected so the instrument is not harmed if the heater
resistance is too small. It is not recommended because the additional load on instrument power
supplies causes noise on internal circuits.
The analog output may also be configured to supply 10 W maximum output. In this configuration the
output specifications are the same as the loop 2 output specifications.
The analog output has four modes of operation: Off, Input, Manual, and Loop 2. If you select Off, the
analog output is set to 0 volts and you are returned to the normal display. Once a mode is selected, the
parameters associated with that mode follow on setting screens.
4.16.1 Analog Output In Input Mode
In Input mode, the analog output will track the input according to scaling parameters entered by the
user. Press the
Analog Output
key.
Select with °®
Analog Out Input A
Press the
s
or
t
key until Input A is showing. Press the
Enter
key.
Select for AnOut °®
Source Temp K
Press the
s
or
t
key to cycle through the data source units: Temp K, Temp C, Sensor, or Linear,
where K = kelvin, C = Celsius, Sensor = volts (V) or ohms (
Ω
), and Linear = MX+B or M(X+B) (refer
to Paragraph 4.14.2). For this example, choose Temp K. Press the
Enter
key.
Select for AnOut °®
Bipolar Mode On
Press the
s
or
t
key to toggle between Bipolar Mode On or Off.
4-32
Operation
