4.8-8 Section 4: Using the Model 9100: Conductance Function
Final Width = 215mm
4.8.5.4 Configuration for Conductance Function in the 9100
The 9100 uses 'Active Impedance' technology to output a 'Virtual Conductance' (
G
T
).
The method relies on the UUT having a form of measurement illustrated by Fig. 4.8.1.
The 9100 will produce a DC voltage (
V
G
) in response to a DC current (I
G
) being sourced
from the UUT. The value of the voltage is derived electronically from the value of I
G
multiplied by the Total Conductance Demand value (G
T
) set on the display (including the
variation due to offset and deviation settings): V
G
= I
G
x (1/G
T
).
The effect is that of placing a conductance of value
G
T
(Virtual Conductance) between
the front panel Hi and Lo terminals of the 9100. The method is shown in Fig. 4.8.2.
Fig. 4.8.2 9100 Configuration for Conductance Function
I
G
Hi Lo
Model 9100
Virtual G
T
Gain
Control
Total
Conductance
Demand
g
R
IN
R
SET
R
STD
0V 0V
I
G
V
G
Lead-Impedance Compensation Bridge
Voltage
Measurement
Conductance
Calculation
and Display
Pseudo
Constant
Current
Source
V
G
Ω
Com
Sense Hi Sense Lo
I
R
UUT
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