Lakeshore 331S - Heater Output; Loop 1 Full Scale Heater Power at Typical Resistance

Lake Shore Model 331 Temperature Controller User’s Manual
Specifications (Continued)
Control
Control loops Two on 331S, one on 331E
Control type Closed loop digital PID with manual heater output, or open loop
Tuning Autotune (one loop at a time), PID, PID zones
Control stability Sensor dependent – to 2× measurement resolution
(in an ideal thermal system)
PID control parameters
Proportional (gain) 0 to 1000 with 0.1 setting resolution
Integral (reset) 1 to 1000 (1000/s) with 0.1 setting resolution
Derivative (rate) 1 to 200% with 1% resolution
Manual output 0 to 100% with 0.01% setting resolution
Zone control 10 temperature zones with P, I, D, manual heater out, and heater range
Setpoint ramping 0.1 K/min to 100 K/min
Safety limits Curve temperature, power up heater off, short circuit protection
Table 1-5. Heater Output
Loop 1 Loop 2
Heater output type Variable DC current source Variable DC voltage source
Heater output D/A resolution 18-bit 16-bit
Max heater power 50 W 1 W
Max heater output current 1 A 0.1 A
Heater output compliance 50 V 10 V
Heater output ranges 3 decade steps in power 1
Heater load type Resistive Resistive
Heater load range
10 Ω to 100 Ω recommended 100 Ω minimum
Heater load for max power
50 Ω 100 Ω
Heater noise (<1 kHz) RMS 50 µV + 0.01% of output voltage <0.3 mV
Isolation
Optical isolation between output and
other circuits
None
Heater connector Dual banana Detachable terminal block
Table 1-6. Loop 1 Full Scale Heater Power at Typical Resistance
Heater Resistance Heater Range Heater Power
10 Ω
Low
Med
High
100 mW
1 W
10 W
25 Ω
Low
Med
High
250 mW
2.5 W
25 W
50 Ω
Low
Med
High
500 mW
5 W
50 W
Introduction 1-7