Wiring Signals
43
6
6
6
6
6
6
6
6
6
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 DT9820 Series function module
as shown in
. In this case, make sure that the low side of the
signal (
−
) is connected to ground at the signal source, not at the
DT9820 Series function module, and do not tie the two grounds
together.
Figure 7: Connecting Differential Voltage Inputs from a Grounded Signal
Source (Shown for Subsystem 0)
Grounded
Signal
Source
+
-
Analog In 0
E
s
Signal Source
Ground V
g1
STP9820 Screw Terminal Panel
It is recommended that you software-select
10 k
Ω
of resistance to connect the low side of
channel 0 to analog ground (a physical resistor
is not required). Refer to
for more
information.
TB1, 1
TB1, 3
.
.
.
TB1, 2
Analog In 0 Return
Analog Ground
Summary of Contents for DT9820 Series
Page 1: ...DT9820 Series UM 18219 B Getting Started Manual...
Page 20: ...Chapter 2 12...
