Calibration; Calibration With Thermistor Probe - Keithley 2001-TCSCAN Instruction Manual

Service Information
Model 237-ALG Triax Cable
Banana Cable
Input Common
Ground
Link
Removed
Figure 4-6
Connections for HI and LO terminal to chassis ground isolation tests
4.4

Calibration

There are two calibration procedures given here. The first
procedure establishes the specified accuracy of the Model
2001-TCSCAN card with a calibrated thermistor probe mon-
itoring the temperature of the isothermal block. The second
procedure establishes an ice-point reference for a piece of
thermocouple wire from the spool intended for a Model
2001-TCSCAN application.
Both calibration procedures should be performed at an ambi-
ent temperature of 23 ° C ± 3 ° C, and a relative humidity of less
than 70%.
It is recommended that the Model 2001-
TCSCAN be calibrated in the same Model
4-10
HI
(Red)
HI
LO
V-Source
Model 6517
Banana Cable (one
end unterminated)
Model 2001
Chassis Ground
NOTE
REF
Channel 1
JCN
HI
Channel 2
LO
Channel 3-4
HI
Channel 5
LO
HI
Channel 6
LO
Channel 7-9
HI
Channel 10
LO
Model 2001-TCSCAN
2001 Multimeter being used for normal
applications.
4.4.1

Calibration with thermistor probe

This procedure requires a calibrated thermistor probe (Ther-
mometrics Series CSP A207A or equivalent). The test can be
automated with a bus controller.
Bench reset conditions are assumed for the Model 2001. In
general, the procedure has the followings steps:
1. Set the Model 2001 Multimeter to the 200k Ω range.
(The short circuit current is 7 µ A. Due to the self-heating
effects of the thermistor probe at higher current, do not
HI
LO
HI
LO
4-Pole 2-Pole
OUT A
OUT B