Campbell CR800 Series, Руководство оператора

Страница: 236 / 598

Section 7. Installation
236
Dwell Burst Measurement
'This program makes 1735 measurements of two single-ended channels at
'2000 Hz. Sample pattern is 1,1,1..., pause, 2,2,2..., pause.
'Measurement cycle is repeated every 2 Sec. The following programming features are
'key to making this application work:
'--PipelineMode.enabled.
'--Dash (-) placed before channel number.
'--Measurement count per channel set with VoltSE() Count= 1735 .
'--Measurement speed set with VoltSE() SampleInterval (µs)=500 .
'--Scan() BufferOption increased to 5.
'NOTES:
'--Sampling occurs at the beginning of the Scan() interval.
'--All measurements for one channel are placed in a single large variable array.
'--The large array is stored in a single long record in the data table.
'--The exact sampling interval is calculated as follows:
' SampleTime = 1.085069 * INT((SampleInterval / 1.085069) + 0.5)
'--At scan interval=2 s, CR800 processing is not fast enough to keep up with the
' 93750 Hz measurements. The result is that the CR800 skips every other scan to
' catch up. If no skipped scans is wanted more than maximum speed, make adjustments
' to the program. For example, set Scan() Interval=3.
PipeLineMode
Public DwellBurstSE1(1735)
Public DwellBurstSE2(1735)
DataTable (DwellBurstSEData,1,-1)
Sample (1735,DwellBurstSE1(),FP2)
Sample (1735,DwellBurstSE2(),FP2)
EndTable
BeginProg
'Scan(Interval,Units,BufferOption,Count)
Scan (2,Sec,5,0)
'VoltSE(Dest,Count,Range,-SEChan,MeasOff,SampleInterval (µs), Integ ,Mult,Offset)
VoltSe (DwellBurstSE1(),1735,mV2_5,-1,False,500,100,1.0,0)
VoltSe (DwellBurstSE2(),1735,mV2_5,-2,False,500,100,1.0,0)
CallTable DwellBurstSEData
NextScan
EndProg
200