Lakeshore 332 - Appendix C - Handling of Liquid Helium and Nitrogen; Appendix D - Curve Tables; Silicon Diode Sensor Calibrations and Calcurve; Appendix B - Temperature Scales

Lake Shore Model 332 Temperature Controller User’s Manual
Band
2 K* -
100 K
100 K -
305 K
305 K -
375 K
11 ±0.25 K ±0.5 K ±1.0 K
11A ±0.25 K ±1% of Temp.
12 ±0.5 K ±1.0 K ±2.0 K
12A ±0.5 K ±1% of Temp.
13 ±1 K ±1% of Temp.
Lake Shore Silicon Diode
Temperature Sensor
Standard
SoftCal
Calibration
Precision
Calibration
Standard sensors are interchange-
able within published tolerance
bands. Below is a list of Standard
Curve 10 DT-470 Tolerance
(Accuracy) Bands.
A Lake Shore SoftCal applies only to
Silicon Diodes. A 2-point SoftCal
takes data points at 77.35 K and
305 K. A 3-point SoftCal takes data
points at 4.2 K, 77.35 K, and 305 K.
Lake Shore precision calibrates
most sensor types by taking up to
99 data points concentrated in
areas of interest. Typical silicon
diode calibration accuracy is listed
below.
A CalCurve can be generated
for either SoftCal or the
Precision Calibration:
CalCurve
Regarding accuracy, there are
3 things that can be done with
a temperature sensor:
8001-332
8000 8002-05-332
Factory installs a NOVRAM
with CalCurve breakpoint
pairs loaded in it.
Users download CalCurve
breakpoint pairs in ACSII format
from a floppy disk.
Users install a NOVRAM
with CalCurve breakpoint
pairs loaded in it.
To increase accuracy, perform a
SoftCal with the controller and
sensor. After sensor calibration, the
custom sensor curve replaces the
standard Curve 10.
* Temperatures down to 1.4 K only with
a Precision Calibrated Sensor.
User calculates break-
points and manually enters
data into the controller
Enter voltages at the 2 or 3 data
points into SoftCal capable
controllers. A calibration report
comes with the sensor.
±1.0 K 2 K to <30 K
±0.25 K 30 K to <60 K
±0.15 K 60 K to <345 K
±0.25 K 345 K to <375 K
±1.0 K 375 K to 475 K
Typical 2-Point Accuracy
±0.5 K 2 K to <30 K
±0.25 K 30 K to <60 K
±0.15 K 60 K to <345 K
±0.25 K 345 K to <375 K
±1.0 K 375 K to 475 K
Typical 3-Point Accuracy
A curve is fitted to these points.
A detailed report including Raw
Temperature Data, Polynomial
Fits, and Interpolation Tables
comes with the sensor.
<10 K 12 mK 20 mK
10 K 12 mK 20 mK
20 K 15 mK 25 mK
30 K 25 mK 45 mK
50 K 30 mK 55 mK
100 K 25 mK 50 mK
300 K 25 mK 50 mK
340 K  100 mK
480 K  100 mK
Temp. Typical Maximum
- or -
C-332-2-1.eps
Figure 2-1. Silicon Diode Sensor Calibrations and CalCurve
2-4 Cooling System Design