VTI Instruments Corp.
102
EX1200A Triggering
Curve fitting constants used by the DMM for supported thermistor types:
Constant
2252
Ω at 25
°C
(Series 44004)
5000
Ω at 25
°C
(Series 44007)
10
kΩ at 25
°C
(Series 44006)
A
0.0014733
0.0012880
0.0010295
B
0.0002372
0.0002356
0.0002391
C
1.074 x 10
-7
9.557 x 10
-8
1.568 x 10
-7
T
ABLE
4-12:
T
HERMISTOR
C
URVE
F
ITTING
C
ONSTANTS
Connecting to the DMM
Any thermistor can be connected to the front panel terminals of the DMM using suitable
connectors. Though this method is not preferred in fixed installation, this can be used to quickly
make readings, and troubleshoot field wiring. Since thermistors is a bilateral resistive device, there
are no polarity restrictions.
DMM Front Panel
Sense HI
Input HI
Input LO
Sense LO
Thermistor
F
IGURE
4-20:
DMM/T
HERMISTOR
C
ONNECTIONS
Summary of Contents for Ametek EX1200A Series
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