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15
Getting Started
3
3.4 CONNECTING SENSOR INPUTS
Figures 3-6
shows excitation supplied from the meter’s internal supply
(50 mA maximum) Select 5, 10, or 12 volt excitation at DIP switch.
Figure 3-6. Meter-powered Bridge Input
Figures 3-7
shows the connections required for an externally-powered bridge input: the
external supply is brought to the meter’s buffer circuits to permit ratiometric readings.
Set S1 DIP switch for external excitation for
Figure 3-7
and
3-8
.
Figure 3-7. Externally-powered Bridge Input
-
E
+
E
+
20mA
+
R
+
24
+
S
-
S
-
R
1
2
3
4
5
6
7
8
+
-
TB2
Connections with “typical wire colors”
+E = Positive Excitation (red)
-E = Negative Excitation (black)
+S = Positive Signal Input (green)
-S = Negative Signal Input (white)
Connections with “typical wire colors”
+E = Positive Excitation (red)
-E = Negative Excitation (black)
+S = Positive Signal Input (green)
-S = Negative Signal Input (white)
TB2
-
E
+
E
+
EX
-
EX
+
20mA
+
R
+
24
+
S
-
S
-
R
1
2
3
4
5
6
7
8
+
-
Summary of Contents for DP25B-S
Page 10: ...Notes viii...