Campbell Scientific CR3000 CR3000 Micrologger - Page 495

Appendix A. CRBasic Programming Instructions SDMTrigger Synchronize when SDM measurements on all SDM devices are made. Syntax SDMTrigger SDMX50 Allows individual multiplexer switches to be activated independently of the TDR100 instruction. Syntax SDMX50(SDMAddress, Channel) TDR100 Directly measures TDR probes connected to the TDR100 or via an SDMX50. Syntax TDR100(Dest, SDMAddress, Option, Mux/ProbeSelect, WaveAvg, Vp, Points, CableLength, WindowLength, ProbeLength, ProbeOffset, Mult, Offset) TimedControl Allows a sequence of fixed values and durations to be controlled by the SDM task sequencer enabling SDM‐CD16x control events to occur at a precise time. See the appendix Relay Drivers (p. 565). Syntax TimedControl(Size, SyncInterval, IntervalUnits, DefaultValue, CurrentIndex, Source, ClockOption A.6 Processing and Math Instructions A.6.1 Mathematical Operators Note Program declaration AngleDegrees() (see Program Declarations (p. 475) ) sets math functions to use degrees instead of radians. A.6.2 Arithmetic Operators Table 119. Arithmetic Operators Symbol Name Notes Result is always promoted to a float (p. 147) to avoid problems that may occur when raising an integer to a negative power. However, loss of precision occurs if result is > 24 bits. For example: (46340 ^ 2) will yield 2,147,395,584 (not precisely correct) ^ Raise to power whereas, (46340 * 46340) will yield 2,147,395,600 (precisely correct) Simply use repeated multiplications instead of ^ operators when full 32-bit precision is required. Same functionality as PWR() (p. 500) instruction. * Multiply / Divide Use INTDV() (p. 500) to retain 32-bit precision 495