VTI Instruments Metek EX1202 User Manual page 98

VTI Instruments Corp.
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.
If the thermistors are connected to a multiplexer card, the wiring is similar to that of a 2-wire
voltage measurement without the polarity constraints, as the thermistors are bilateral passive
devices.
98
(Series 44004)
A 0.0014733
B 0.0002372
-7
C 1.074 x 10
T 4-12: T
ABLE HERMISTOR
Sense HI
Input HI
Input LO
Sense LO
DMM Front Panel
F 4-20: DMM/T
IGURE
DMM Backplane
Multiplexer Cards
EX1200 Mainframe
F 4-21: T
IGURE HERMISTOR
(Series 44007)
0.0012880
0.0002356
-8
9.557 x 10
C F C
URVE ITTING ONSTANTS
Thermistor
C
HERMISTOR ONNECTIONS
CH 1
CH 2
CH n
EX1200
C DMM B
ONNECTIONS VIA
Basic EX1200 DMM Operation
(Series 44006)
0.0010295
0.0002391
-7
1.568 x 10
Thermsitors
US