Campbell AM16B, Product Manual, Page: 29 / 42

Appendix B. Example Programs
B-4
B.2 Differential Voltage Measurement
FIGURE B-2 shows a typical connection for differential voltage
measurements. Using this method, a datalogger can make up to 32 differential
voltage measurements through a multiplexer. See CRBasic Example B-3 ,
CRBasic Example B-4 , and TABLE B-2 for related programs and wiring
diagram, or use Short Cut to create your own.
FIGURE B-2. Typical differential voltage measurement connection
Notice that these programs use arrays for multipliers and offsets. This allows
you to adjust multipliers and offsets for each sensor individually. For example,
in this program the third multiplier, 8 , and the third offset, 9 , would be applied
to the third measurement, DiffV(3) .
TABLE B-2. Wiring for Differential Voltage Measurements CRBasic Example
CR1000X
CR300 AM16/32B in 2X32 Mode
Sensors
Control and
COM Terminals
Measurement Terminals
1H 1H COM ODD H H High signal
1L 1L COM ODD L L Low signal
⏚ ( Signal Ground ) ⏚ ( Signal Ground )
COM
Shield
12V SW12V 12V
G G G
C1 C1 CLK
C2 C2 RES
CRBasic Example B-3 is a CR300-series program. With minor adjustments,
this program can be used with the CR1000X series, CR6 series, CR800 series,
CR1000, or CR3000. The AM16/32B must be in 2x32 mode.