4.15-8 Section 4: Using the Model 9100: RTD Temperature Function
Final Width = 215mm
4.15.4.6 2-Wire Connection
If it is deemed absolutely necessary to use a two wire connection, the 9100 should be
informed by de-selecting '
4 WIRE'. As illustrated in Fig.4.15.3, the 9100 will then
permanently short Hi to Hi Sense, and Lo to Lo Sense, so that at least the internal
protection circuitry is compensated. Measurements made by the UUT will, of course, still
include the resistance of the two interconnecting leads. Do not use 2-wire connections
when '
4 WIRE
' is selected on the 9100.
I
R
Hi Lo
Model 9100
Virtual R
T
Gain
Control
Total
Resistance
Demand
G
R
IN
R
SET
R
STD
0V 0V
I
R
V
R
Lead-Impedance Compensation Bridge
Resistance
Calculation
Resistance-
Temperature
Conversion
and Display
Voltage
Measurement
Pseudo
Constant
Current
Source
V
R
°C
Com
Sense Hi Sense Lo
I
R
UUT
Temperature
Selection and
Conversion to
Resistance
Fig. 4.15.3 Model 9100 2-Wire Configuration for
RTD Temperature Function
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