The Model 332 is discontinued. Please consider the Model 335.

Model 332 Specifications

Input specifications

 Sensor temperature coefficient Input range Excitation currentDisplay resolution Measurement resolution Electronic accuracy Electronic control stability12
Diodenegative0 V to 2.5 V 10 µA ±0.05%14, 15100 µV10 µV±80 µV ±0.005% of rdg ±20 µV
negative0 V to 7.5 V10 µA ±0.05%14, 15100 µV20 µV±80 µV ±0.005% of rdg±40 µV
PTC RTD positive0 Ω to 250 Ω1 mA16 10 mΩ2 mΩ±0.0040 ±0.01% of rdg±4 mΩ
positive0 Ω to 500 Ω1 mA1610 mΩ2 mΩ±0.0040 ±0.01% of rdg±4 mΩ
positive0 Ω to 5000 Ω1 mA16100 mΩ20 mΩ±0.0040 ±0.02% of rdg±40 mΩ
NTC RTD negative0 Ω to 75 Ω1 mA161 mΩ0.3 mΩ + 0.000% of rdg±0.001 Ω ±0.04% of rdg±0.6 mΩ
negative0 Ω to 750 Ω100 µA1610 mΩ3 mΩ + 0.001% of rdg±0.01 Ω ±0.04% of rdg±6 Ω ±0.002% of rdg
negative0 Ω to 7500 Ω10 µA16100 mΩ20 mΩ + 0.001% of rdg ±0.1 Ω ±0.04% of rdg±40 mΩ ±0.002% of rdg
negative0 Ω to 75000 Ω1 µA161 Ω0.15 Ω + 0.003% of rdg ±1.0 Ω ±0.04% of rdg±0.3 Ω ±0.006% of rdg
Thermocouple positive±25 mVNA1 µV0.4 µV±1 µV ±0.05% of rdg17 0.8 µV
positive±50 mVNA1 µV0.4 µV±1 µV ±0.05% of rdg17 0.8 µV

13 Control stability of the electronics only, in an ideal thermal system
14 Current source error has negligible effect on measurement accuracy
15 Diode input excitation current can be set to 1 mA — refer to the Model 331 user manual for details
16 Current source error is removed during calibration
17 Accuracy specification does not include errors from room temperature compensation


Number of inputs2
Input configurationEach input is factory configured as either diode/RTD or thermocouples
IsolationSensor inputs optically isolated from other circuits but not from each other
A/D resolution 24-bit
Input accuracySensor dependent — refer to Input Specifications table
Measurement resolutionSensor dependent — refer to Input Specifications table
Maximum update rate10 readings per s on each input with the following exceptions: 5 readings per s when configured as 75 kΩ NTC RTD with reversal on, 5 readings per s on input A when configured as thermocouple
AutorangeAutomatically selects appropriate NTC RTD range
User curvesRoom for 20 200-point CalCurves™ or user curves
SoftCal™Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves accuracy of platinum RTDs to ±0.25 K from 70 K to 325 K; stored as user curves
MathMaximum and minimum, and linear equation (Mx + B) or M(x + B)
Filter Averages 2 to 64 input readings

Sensor input configuration

Measurement type 4-lead differential 2-lead, room temperature compensated
ExcitationConstant current with current reversal for RTDs NA
Supported sensors Diodes: Silicon, GaAlAs RTDs: 100 Ω Platinum, 1000 Ω Platinum, Germanium, Carbon-Glass, Cernox®, and Rox™Most thermocouple types
Standard curves DT-470, DT-500D, DT-670, PT-100, PT-1000, RX-102A, RX-202AType E, Type K, Type T AuFe 0.07% vs. Cr, AuFe 0.03% vs Cr
Input connector 6-pin DIN Ceramic isothermal block


Control loops 2
Control type Closed-loop digital PID with manual heater output or open loop
TuningAutotune (one loop at a time), manual PID, zones
Control stabilitySensor dependent — to 2× measurement resolution (in an ideal thermal system)
PID control settings 
Proportional (gain) 0 to 1000 with 0.1 setting resolution
Integral (reset) 1 to 1000 (1000 per s) with 0.1 setting resolution
Derivative (rate) 1% to 200% with 1% setting resolution
Manual output 0% to 100% with 0.001% setting resolution
Zone control 10 temperature zones with P, I, D, manual heater out, and heater range
Setpoint ramping  0.1 K per min to 100 K per min
Safety limits Curve temperature, power up heater off, and short-circuit protection

Heater output

 Loop 1 Loop 2
Heater output type Variable DC current source Variable DC voltage source
Heater output D/A resolution 18-bit16-bit
Max heater power 50 W 10 W
Max heater output current 1 A 1 A
Heater output compliance50 V 10 V
Heater source impedance N/A0.1 Ω maximum
Heater output ranges 3 decade steps in power 1
Heater load type ResistiveResistive
Heater load range 10 Ω to 100 Ω recommended 10 Ω minimum
Heater load for max power 50 Ω10 Ω
Heater noise (<1 kHz) RMS 50 µV + 0.017% of output voltage <0.3 mV
IsolationOptical isolation between output and other circuits None
Heater connector Dual banana Detachable terminal block

Loop 1 full scale heater power at typical resistance

Heater resistanceHeater rangeHeater power
10 Ω Low100 mW
Med1 W
High10 W
25 Ω Low250 mW
Med2.5 W
High25 W
50 Ω Low500 mW
Med5 W
High50 W

Front panel

Display2 line by 20 character, 9 mm character height, vacuum fluorescent display
Number of readingdisplays 1 to 4
Display units K, ºC, V, mV and Ω
Reading source Temperature, sensor units, max, min, and linear equation
Display update rateAll readings twice per s
Temp display resolution0.001º from 0º to 99.999º, 0.01º from 100º to 999.99º, 0.1º above 1000º
Sensor units display resolution Sensor dependent to 5 digits
Other displays Setpoint, heater range, and heater output (user selected)
Setpoint setting resolution  Same as display resolution(actual resolution is sensor dependent)
Heater output display Numerical or graphical display in percent of full scale for power or current
Heater output resolution 1% numeric or 2% graphical
Display annunciators Control input, remote, alarm, tuning, ramp, max, min, and linear
Keypad20 full-travel keys, numeric and specific functions
Front panel features Front panel curve entry, display brightness control, and keypad lock-out


IEEE-488.2 interface

FeaturesSH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate To 10 readings per s on each point
Software SupportLabVIEW™ driver

Serial interface

Electrical format RS-232C
Max baud rate 9600 baud
Connector9-pin D-sub
Reading rate To 10 readings per s on each input (at 9600 baud)
Special interface features Model 330 command emulation mode


Number 4: high and low for each input
Data source Temperature, sensor units, and linear equation
SettingsSource, high setpoint, low setpoint, deadband, latching or non-latching, and audible on/off
ActuatorsDisplay, annunciator, beeper, and relays


Number 2
Contacts Normally open (NO), normally closed (NC), and (C) common
Contact Rating 30 VDC at 5 A
Operation Activate relays on high, low or both alarms for either input or manual
ConnectorDetachable terminal block

Analog voltage outputs

when not used as control loop 2 output)
Scale User selected
Update rate 10 readings per s
Data source Temperature, sensor units, and linear equation
Settings Input, source, top of scale, bottom of scale, or manual
Range ±10 V
Resolution 0.3 mV
Accuracy±2.5 mV
Max output power 1 W (jumper selected)
Min load resistance 100 Ω (short-circuit protected)
Source impedance 0.01 Ω


Ambient temp range 15 °C to 35 °C at rated accuracy, 10 ºC to 40 ºC at reduced accuracy
Power requirements100, 120, 220, 240 VAC (+6%, -10%), 50 or 60 Hz, 150 VA
Size216 mm W × 89 mm H × 368 mm D (8.5 in × 3.5 in × 14.5 in), half rack
Weight4.8 kg (10.5 lb)
Approval CE mark

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