Excitation And Measurement Sequence For 4 Wire Full Bridge - Campbell Measurement and Control Module CR10 Operator's Manual

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FIGURE 13.5-2. Excitation and Measurement Sequence for 4 Wire Full Bridge
TABLE 13.5-1. Comparison of Bridge Measurement Instructions
Instr. # Circuit
4
DC Half Bridge The delay parameter
5
AC Half Bridge Rapid reversal of
6
4 Wire
Full Bridge
Description
allows the user entered
settling time com-
pensate for capacitance
in long lead lengths. No
polarity reversal. One
single-ended measure-
ment. Measured
voltage output.
excitation polarity for
ion depolarization.
One single-ended
measurement at each
excitation polarity.
Ratiometric output.
One differential
measurement at each
excitation polarity.
Ratiometric output.
SECTION 13. CR10 MEASUREMENTS
Instr. # Circuit
7
3 Wire
Half Bridge
8
Differential
Measurement
with Excitation
9
6 Wire
Full Bridge
or 4 Wire
Half Bridge
Description
Compensates for lead
wire resistance,
assuming resistance is
same in both wires.
Two single-ended
measurements at each
excitation polarity.
Ratiometric output.
Makes a differential
measurement without
reversing excitation
polarity. Used for fast
measurements on load
cells, PRTs etc.
Resolution and
common mode rejection
worse than 6 if used
with delay = 0.
Measured voltage
output.
Compensates for lead
wire resistance. Two
differential measure-
ments at each
excitation polarity.
Ratiometric output.
13-19

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