1
Section 1
General Information
1.1 Introduction
Two controllers, the Model 325 and 350, provide superior temperature
stability and a wide range of power outputs. Each has a fast settling,
hybrid P-I control loop that delivers a low noise, bipolar current output in
three operating modes: 1) constant R (thermistor), 2) constant T (IC
sensors), or 3) constant I
TE
. A user adjustable I
TE
current limit setting
unconditionally protects the TE modules from damage by excessive drive
current independent of the operating mode. The Model 300 Series is
compatible with thermistors, and AD590 and LM335 Series IC temperature
sensors. Temperature readings (°C) are displayed when using one of these
IC sensors. Model 325 AN and 350 AN include an Analog Interface allowing
remote instrument control and monitoring of display levels.
1.2 Specifications
Model 325 Model 350
Model 325AN Model 350AN
Output
Output Type Bipolar, constant current source Bipolar, constant current source
Control Loop Type Hybrid P-I Hybrid P-I
Maximum Current ±2.5 Amps ±5 Amps
Compliance Voltage >6 Volts >10 Volts
Available Output Power 15 Watts 50 Watts
Current Limit
Range 0 to 2.5 Amps 0 to 5 Amps
Accuracy ±10 mA ±20 mA
Ripple/Noise (rms) < 1 mA < 2 mA
Stability
Short Term (10 to 30 min.) 0.005 °C 0.005 °C
Long Term (24 hour period) 0.01 °C 0.01 °C
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