18.1.2 Differential measurements
A differential measurement measures the difference in voltage between two input terminals. For
example, DIFF channel 1 is comprised of terminals 1H and 1L, with 1H as high and 1L as low. For
more information, see Wiring panel and terminal functions(p. 8). The differential configuration is
used with the following CRBasic instructions:
l
VoltDiff()
l
BrFull()
l
BrFull6W()
l
BrHalf4W()
l
TCDiff()
For more information on voltage measurements, see Improving voltage measurement quality(p.
189) and Analog measurement specifications(p. 243).
18.2 Current-loop measurements
Terminals SE1 and SE2 can be configured to make analog current measurements using the
CurrentSE() instruction. Current is measured across the 100 Ω resistor with 140 Ω total
resistance to ground. The following image shows a simplified schematic of a current
measurement.
Use a CURS100 terminal input module when an application needs more than 2 current inputs or
measurements. For detailed instructions, see http://www.campbellsci.com/curs100 .
18. Measurements92
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