Data Translation DT300 Series, Руководство по началу работы

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Chapter 5
50
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 STP300 screw terminal panel as
shown in
Figure 10 . In this case, make sure that the low side of the
signal (
−
) is connected to ground at the signal source, not at the
STP300 screw terminal panel, and do not tie the two grounds
together.
Figure 10: Connecting Differential Voltage Inputs from a Grounded Signal
Source (Shown for Channel 0)
TB18
Grounded
Signal
Source
+
-
TB1
TB2
Analog In 0
Analog In 0
Return
E
s
Signal Source
Ground V
g1
STP300 Panel
Resistor R1 should be installed for bias return
in case the external ground is floating.
R1
Analog Ground