Single-Ended Measurements; Differential Measurements - Campbell CR300 Series Product Manual

ground. A differential measurement measures the high signal with reference to the low signal.
Each configuration has a purpose, but the differential configuration is usually preferred.
In general, use the smallest input range that accommodates the full-scale output of the sensor.
This results in the best measurement accuracy and resolution (see
specifications (p. 187) for more information).
A set overhead reduces the chance of overrange. Overrange limits are available in the
specifications. The data logger indicates a measurement overrange by returning a NAN for the
measurement.
WARNING:
Sustained voltages in excess of -6 V or +9 V (SE1, SE2), ±17 V (SE3 to SE6) applied to
terminals configured for analog input will damage CR300 series circuitry.

14.1.1 Single-ended measurements

A single-ended measurement measures the difference in voltage between the terminal
configured for single-ended input and the reference ground. For example, single-ended channel
1 is comprised of terminals SE 1 and
information, see Wiring panel and terminal functions
used with the following CRBasic instructions:
VoltSE()
l
BrHalf()
l
BrHalf3W()
l
TCSE()
l
Therm107()
l
Therm108()
l
Therm109()
l
See the CRBasic Editor help for detailed instruction information and program examples:
https://help.campbellsci.com/crbasic/cr300/.

14.1.2 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
is used with the following CRBasic instructions:
VoltDiff()
l
BrFull()
l
. Single-ended terminals are labeled in blue. For more
Wiring panel and terminal functions
Analog measurement
(p. 5). The single-ended configuration is
(p. 5). The differential configuration
14. Measurements 69