Lake Shore Model 231 User’s Manual
1-4
Introduction
Table 1-2. Model 231P Input Specifications
Thermometry:
Number of Inputs: One input
Measurement Type: Four-lead differential
Sensor Type: Platinum
Sensor Temp. Coefficient: Positive
Sensor Units: Ohm (
)
Input Range: 0
–
312
Sensor Excitation: 500 µA ±0.02% DC current
Update Rate: 5 readings per second.
CalCurve Storage: 1 curve, loaded in PROM at factory.
Example Lake Shore Sensor: PT-103
Temperature Range: 14 K
–
873 K with PT-103
Standard Curve: DIN 43760
Typical Sensor Sensitivity: 0.19
/K @ 30 K
0.42
/K @ 77.35 K
0.39
/K @ 300 K
0.34
/K typical up to 800 K
Measurement Resolution:
Sensor Units: 4.8 m
Temp. Equivalence:
22 mK at 30 K
11 mK at 77.35 K
13 mK at 300 K
14 mK typical up to 800 K
Measurement Accuracy:
Sensor Units: Ohms (
)
Temp. Accuracy:
±0.2 K at 30 K
±0.15 K at 77.35 K
±0.3 K at 300 K
±0.7 K typical up to 800 K
Measurement Temperature Coefficient:
Sensor Units: 0.002% of voltage reading per °C
Temp. Equivalence:
0.4 mK/°C at 30 K
1 mK/°C at 77.35 K
6 mK/°C at 300 K
18 mK/°C at 800 K
Magnetic Field Use:
Up to 19 teslas for T > 30 K.
Summary of Contents for 231
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