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4-3
V
REF
= (T
J
+ 273.15)
×
0.0002
7. Read the voltage across the output of OUT A (Model
2001 #2). Compare the measured and calculated voltag-
es. If they differ by more than 72
µ
V (0.36
°
C), perform
the calibration procedure of paragraph 4.4.1.
Table 4-1
Verification and calibration equipment
Description
Model or part
Specifications
Applications
DMM*
Keithley Model 2001
20
Ω
, 72ppm
200k
Ω
, 90ppm
200mV, 37ppm
Path resistance
Calibration
Reference junction, calibration
Electrometer w/voltage source
Keithley Model 6517
20pA, 200pA; 1.6%
200V source; 0.05%
Offset current, path isolation
Sensitive Digital Voltmeter
Keithley Model 182
3mV; 60ppm
Contact potential
Triax cable (unterminated)
Keithley Model 237-
ALG-2
—
Offset current
Low thermal cable (untermi-
nated)
Keithley Model 1484
—
Contact potential
Thermistor probe
Thermometrics Series
CSP A207A
±
0.005
°
C accuracy
Reference junction, calibration
Reference thermometer
—
±
0.01
°
C w/thermistor
Reference junction, calibration
Distilled water ice bath
(Dewar flask or Thermos)
—
±
0.1
°
C
Calibration
#22 AWG solid copper wire
—
—
Path resistance
#22 AWG Teflon-insulated
stranded wire
—
—
Path isolation
* Two DMMs are required for thermistor calibration method and reference junction test.
4. Coat the probe with a thermally conductive compound,
and insert it into the 0.110” hole marked “CAL” on the
Model 2001-TCSCAN printed circuit board.
5. Use the Model 2001 #1 front panel CHAN key to close
Channel 1.
6. Take a reading from the reference thermometer (T
J
). Use
the following equation to calculate the equivalent refer-
ence junction output voltage (V
REF
):
Содержание 2001-TCSCAN
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