
Chapter 4
48
Figure 9: Connecting Differential Voltage Inputs (Shown for Channel 0)
with and without Input Bias Return Resistors
Note that since they measure the difference between the signals at the high (+) and low (
−
)
inputs, differential connections usually cancel any common-mode voltages, leaving only the
signal. However, if you are using a grounded signal source and ground loop problems arise,
connect the differential signals to the DT730 or DT730-T screw terminal panel as shown in
Figure 10
, using an input bias return resistor if the external ground signal is floating. In this
case, make sure that the low side of the signal (
−
) is connected to ground at the signal source,
not at the DT730 or DT730-T screw terminal panel, and do not tie the two grounds together.
DT730
or
DT730-T
Panel
Floating
Signal
Source
+
-
TB100
TB99
TB36
Analog In 0
Analog In 0
Return
Analog Ground
R
b
R
s
TB36
Analog In 0
Return
Analog In 0
Analog Ground
R
v
R
s
Bridge
+
-
DC Supply
Use resistor R1 to connect
the low side of channel 0 to
analog ground.
A)
B)
DT730
or
DT730-T
Panel
TB100
TB99
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Содержание DT3000 Series
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Страница 147: ...Appendix C 146 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 155: ...Index 154 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...