Campbell Scientific CR23X Micrologger User Manual
Page 222
SECTION 13. CR23X MEASUREMENTS
13-22
FIGURE 13.5-2. Excitation and Measurement Sequence for 4 Wire Full Bridge
TABLE 13.5-1. Comparison of Bridge Measurement Instructions
Instr. Circuit
Description
4
DC Half Bridge User entered settling time allows compensation for capacitance in long lead
lengths. No polarity reversal. One single-ended measurement. Measured
voltage output.
5
AC Half Bridge Rapid reversal of excitation polarity for ion depolarization. One single-ended
measurement at each excitation polarity. Ratiometric output.
6
4 Wire
Slightly lower noise than 9. One differential measurement at each excitation
Full Bridge
polarity. Ratiometric output.
7
3 Wire
Compensates for lead wire resistance, assuming resistance is same in both
Half Bridge
wires. Two single-ended measurements at each excitation polarity. Ratiometric
output.
8
Differential
Makes a differential measurement without reversing excitation polarity or
Measurement switching inputs. Used for fast measurements on load cells, PRTs etc.
with Excitation Resolution and common mode rejection worse than 6 if used with delay=0.
Measured voltage output.
9
6 Wire
Compensates for lead wire resistance. Two differential measurements at each
Full Bridge
excitation polarity. Ratiometric output.
or 4 Wire
Half Bridge