Campbell CR850 - Excitation; Pulse and Frequency

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)