Differential Measurements; Current-Loop Measurements - Campbell CR300 Series Product Manual

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
used with the following CRBasic instructions:
VoltDiff()
l
BrFull()
l
BrFull6W()
l
BrHalf4W()
l
TCDiff()
l
For more information on voltage measurements, see
189) and Analog measurement

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
Wiring panel and terminal
specifications (p. 243).
functions (p. 8). The differential configuration is
Improving voltage measurement
http://www.campbellsci.com/curs100
quality (p.
.
18. Measurements 92