Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 463)

Appendix A. CRBasic Programming Instructions
463
BrHalf3W
Measures ratio of R
s
/ R
f
of a three‐wire half‐bridge.
Syntax
BrHalf3W(Dest, Reps, Range, SEChan, Vx/ExChan, MeasPEx, ExmV,
RevEx, SettlingTime, Integ, Mult, Offset)
BrHalf4W
Measures ratio of R
s
/ R
f
of a four‐wire half‐bridge.
Syntax
BrHalf4W(Dest, Reps, Range1, Range2, DiffChan, Vx/ExChan,
MeasPEx, ExmV, RevEx, RevDiff, SettlingTime, Integ, Mult,
Offset)
A.5.5 Excitation
ExciteV
This instruction sets the specified switched‐voltage excitation channel to the
voltage specified.
Syntax
ExciteV(Vx/ExChan, ExmV, XDelay)
SW12
Sets a switched 12‐Vdc terminal high or low.
Syntax
SW12(State)
A.5.6 Pulse and Frequency
Read More! See Pulse
(p. 297).
Note Pull-up resistors are required when using digital I/O (control) ports for
pulse input (see Pulse Input on Digital I/O Channels C1 - C4
(p. 301)
).
PeriodAvg
Measures the period of a signal on any single‐ended voltage input channel.
Syntax
PeriodAvg(Dest, Reps, Range, SEChan, Threshold, PAOption,
Cycles, Timeout, Mult, Offset)
PulseCount
Measures number or frequency of voltages pulses on a pulse channel.
Syntax
PulseCount(Dest, Reps, PChan, PConfig, POption, Mult, Offset)
VibratingWire
The VibratingWire instruction is used to measure a vibrating wire sensor with a
swept frequency (from low to high).
Syntax
VibratingWire(Dest, Reps, Range, SEChan, Vx/ExChan,
StartFreq, EndFreq, TSweep, Steps, DelMeas, NumCycles,
DelReps, Multiplier, Offset)