Keithley 2001-TCSCAN - 4.4 Calibration

Service Information
4-10
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%.
NOTE
It is recommended that the Model 2001-
TCSCAN be calibrated in the same Model
HI
LO
Channel 2
HI
LO
Channel 3-4
Channel 5
HI
LO
Channel 6
HI
LO
Channel 7-9
Channel 10
HI
LO
OUT A
OUT B
HI
LO
2-Pole
4-Pole
Model 2001-TCSCAN
Model 2001
Chassis Ground
REF
JCN
Channel 1
HI
Model 6517
Input
(Red)
Banana Cable
Common
V-Source
HI
LO
Ground
Link
Removed
Model 237-ALG Triax Cable
Banana Cable (one
end unterminated)
Figure 4-6
Connections for HI and LO terminal to chassis ground isolation tests
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