I`m tested system for dynamical geotechnical monitoring.
Used 8 Geokon Inc. VW tilt sensors Model 6350, connected through CDM-VW305 to CR6 datalogger.
The system works perfectly. Even in the alarm event mode.
I want to expand the system's capabilities, by connecting three additional VW sensors to the CR6 U terminals.
Typically CRBasic main program for CDM-VW305 are:
...
BeginProg
Scan(50,msec,500,0) '20 Hz/50msec scan rate
PanelTemp (PTemp_C,250)
Battery (BattV)
CDM_VW300Dynamic(CPI_ADDR,Freq(),Diag())
If TimeIntoInterval (0,1,Sec) Then
CDM_VW300Static(CPI_ADDR, Result(),Temp(),DynStdDev()
CallTable tableSTATIC
EndIf
NextScan
EndProg
Typically CRBasic sequence, for U terminals reading in VW mode, are:
If TimeIntoInterval (0,10,Sec) Then
VibratingWire(VW1(),0,U1,1400,3500,1,0.01,"",50,A,B,C)
VibratingWire(VW2(),0,U5,1400,3500,1,0.01,"",50,A,B,C)
VibratingWire(VW3(),0,U9,1400,3500,1,0.01,"",50,A,B,C)
Tilt1 = 2.111E-6*Hertz1^2-0.0
Tilt2 = 2.153E-6*Hertz2^2-0.0
Tilt3 = 2.000E-6*Hertz3^2-0.0
CallTable tableExtSTATIC
EndIf
Question:
How to integrate this sequence to main program, if instruction`s CDM_VW300Dynamic and CDM_VW300Static not support SubScan and SlowSequence ?
Gintaris
Geoprojektas Ltd.
Lithuania
Gintaris,
Thank you for posting this to the forum.
Currently the CR6 cannot make static vibrating wire measurements while performing dynamic vibrating wire measurements. The time required to make the static vibrating wire measurement conflicts with the fast mainscan running in pipeline mode.
We do intend for both measurements to function within a CR6 program and will try to have this operational in the next CR6 Operating System release.
The static vibrating wire measurements will be required to run in the Slow Sequence Scan.
The current work-around would be to use another CDM-VW305 operating in the 1-Second static mode to measure the additional vibrating wire sensors.
Regards,
Mike
Thanks Mike,
I'm asking the same for Geokon Inc. and Campbell UK boy`s.
The solution was the same. Negative.
But your answer - the most accurate.
Thank you.
Despite this - CR6+CDM-VW305 - brillliant set.
Respect CSI!
Gintaris
Geoprojektas Ltd.
Lithuania