Lakeshore 332 - Page 16

Lake Shore Model 332 Temperature Controller User’s Manual
Table 1-2. Model 332 Typical Sensor Performance Chart (Continued)
Sensor Type
Germanium
GR-200A-1500
Germanium
GR-200A-250
Cernox™
CX-1070
Cernox™
CX-1050
Cernox™
CX-1030
Temperature Coefficient Negative Negative Negative Negative Negative
Input Range AutoRange AutoRange AutoRange AutoRange AutoRange
Sensor Excitation*
(Constant Current)
75 mV max
4 ranges from 75 Ω -
75 kΩ
75 mV max
4 ranges from 75 Ω -
75 kΩ
75 mV max
4 ranges from 75 Ω -
75 kΩ
75 mV max
4 ranges from 75 Ω -
75 kΩ
75 mV max
4 ranges from 75 Ω -
75 kΩ
Display Resolution (Sensor Units) 5 digits 5 digits 5 digits 5 digits 5 digits
Example Lake Shore Sensor
GR-200A-1500
with1.4D calibration
GR-200A-250 with
0.3D calibration
CX-1070-SD with
1.4L calibration
CX-1050-SD with
1.4L calibration
CX-1030-SD with
1.4L calibration
Standard Sensor Curve
Requires calibrated
sensor
Requires calibrated
sensor
Requires calibrated
sensor
Requires calibrated
sensor
Requires calibrated
sensor
Typical Sensor Sensitivity
†
–64200 Ω/K at 1.4 K
–668 Ω/K at 4.2 K
–0.078Ω/K at 77 K
–8450 Ω/K at 1 K
–68.9 Ω/K at 4.2 K
–0.054 Ω/K at 77 K
–17600 Ω/K at 4.2 K
–-969 Ω/K at 10 K
–8.26 Ω/K at 77 K
–0.419 Ω/K at 300 K
–-42800 Ω/K at 2 K
–2290 Ω/K at 4.2 K
–2.15 Ω/K at 77 K
–0.131 Ω/K at 300 K
–-8670 Ω/K at 1.4 K
–138 Ω/K at 4.2 K
–-.828 Ω/K at 77 K
–0.067 Ω/K at 300 K
Measurement Resolution:
Sensor Units
Temperature Equivalence
A
uto Range
see Table 1-3
<10 µK at 1.4 K
4
30 µK at 4.2 K
3
3.8 mK at 77 K
1
A
uto Range
see Table 1-3
<10 µK at 1 K
3
40 µK at 4.2 K
2
5.5 mK at 77 K
1
A
uto Range
see Table 1-3
<10 µK at 4.2 K
4
<100 µK at 10 K
3
3.6 mK at 77 K
2
7.2 mK at 300 K
2
A
uto Range
see Table 1-3
<10 µK at 2 K
4
<10 µK at 4.2 K
3
1.2 mK at 77 K
2
2.3 mK at 300 K
1
A
uto Range
see Table 1-3
<10 µK at 1.4 K
3
20 µK at 4.2 K
2
3.6 mK at 77 K
2
4.5 mK at 300 K
1
Electronic Accuracy:
Sensor Units
Temperature Equivalents
Auto Range
see Table 1-3
±0.2 mK at 1.4 K
4
±1 mK at 4.2 K
3
±38 mK at 77 K
1
Auto Range
see Table 1-3
±0.2 mK at 1 K
3
±2 mK at 4.2 K
2
±47 mK at 77 K
1
Auto Range
see Table 1-3
±1 mK at 4.2 K
4
±3 mK at 10 K
3
±28 mK at 77 K
2
±128 mK at 300 K
2
Auto Range
see Table 1-3
±0.3 mK at 2 K
4
±1 mK at 4.2 K
3
±30 mK at 77 K
2
±130 mK at 300 K
1
Auto Range
see Table 1-3
±0.2 mK at 1 K
3
±2 mK at 4.2 K
2
±57 mK at 77 K
2
±224 mK at 300 K
1
Temperature Accuracy including
electronic accuracy, CalCurve
and calibrated sensor
±6 mK at 1.4 K
4
±6 mK at 4.2 K
3
±128 mK at 77 K
1
±6 mK at 1 K
3
±7 mK at 4.2 K
2
±137 mK at 77 K
1
±7 mK at 4.2 K
4
±11 mK at 10 K
3
±78 mK at 77 K
2
±268 mK at 300 K
2
±6 mK at 2 K
4
±7 mK at 4.2 K
3
±80 mK at 77 K
2
±270 mK at 300 K
1
±6 mK at 1.4 K
3
±8 mK at 4.2 K
2
±107 mK at 77 K
2
±364 mK at 300 K
1
Control Stability:
Sensor Units
Temperature Equivalence
±80 mΩ
±20 µK at 1.4 K
4
±60 µK at 4.2 K
3
±7.6 mK at 77 K
1
±80 mΩ
±20 µK at 1 K
3
±80 µK at 4.2 K
2
±11 mK at 77 K
1
±80 mΩ
±20 mK at 4.2 K
4
±7.2 mK at 77 K
2
±14.4 mK at 300 K
2
±80 mΩ
±8 µK at 2 K
4
±20 µK at 4.2 K
3
±2.4 mK at 77 K
2
±4.58 mK at 300 K
1
±80 mΩ
±20 µK at 1.4 K
3
±40 µK at 4.2 K
3
±7.2 mK at 77 K
3
±9 mK at 300 K
3
Magnetic Field Use
Not Recommended Not Recommended
Recommended for
T > 2 K & B ≤ 19 T
Recommended for
T > 2 K & B ≤ 19 T
Recommended for
T > 2 K & B ≤ 19 T
* Current reversal eliminates thermal EMF voltage errors for resistor sensors.
†
Typical sensor sensitivities were taken from representative calibrations for the sensor listed.
NOTES:
1 NTC RTD Range 75 Ω
2 NTC RTD Range 750 Ω
3 NTC RTD Range 7500 Ω
4 NTC RTD Range 75000 Ω
1-6 Introduction