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. Measurements92
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