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Campbell Scientific CR3000 CR3000 Micrologger - Page 238
Measurement Rate: 101 to 600 Hz
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Section 7. Installation BeginProg Scan(1,Sec,0,0)'
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Section 7.
Installation
238
BeginProg
Scan
(1,Sec,0,0)
'<<<<Measurement rate is determined by Interval and Units
VoltSe
(FastSE(),1,mV2_5,1,False,100,250,1.0,0)
CallTable
FastSETable
NextScan
EndProg
By modifying the
Interval
,
Units
,
and Buffers
arguments,
VoltSE()
can be
executed at 100 Hz at 100% duty cycle.
The following program measures 16
analog input channels at 100 Hz.
Table 36.
CRBasic EXAMPLE. Measuring VoltSE() at 100 Hz
PipeLineMode
'<<<<Pipeline mode ensures precise timing of measurements.
Public
FastSE(16)
DataTable
(FastSETable,1,-1)
Sample
(16,FastSE(),FP2)
EndTable
BeginProg
Scan
(10,mSec,10,0)
'<<<<Measurement rate is determined by Interval, Units, and Buffers
VoltSe
(FastSE(),16,mV2_5,1,False,100,250,1.0,0)
CallTable
FastSETable
NextScan
EndProg
7.8.12.2 Measurement Rate: 101 to 600 Hz
To measure at rates between 100 and 600 Hz, the
SubScan()
/
NextSubScan
instruction pair is added.
Measurements over 100 Hz do not do not have 100%
duty cycle, but are accomplished through measurement bursts.
Each burst lasts
for some fraction of the scan interval.
During the remainder of the scan interval,
the CR3000 processor catches up on overhead tasks and processes data stored in
the buffers.
For example, the CR3000 can be programmed to measure
VoltSE()
on 8 channels at 200 Hz with a 95% duty cycle as follows:
Table 37.
Measuring VoltSE() at 200 Hz
PipeLineMode
'<<<<Pipeline mode ensures precise timing of measurements.
Public
BurstSE(8)
DataTable
(BurstSETable,1,-1)
Sample
(8,BurstSE(),FP2)
EndTable
BeginProg
Scan
(1,Sec,10,0)
'<<<<Buffers added
SubScan
(5,mSec,190)
'<<<<Interval, Units, and Count determine speed and number of measurements
VoltSe
(BurstSE(),8,mV2_5,1,False,100,250,1.0,0)
CallTable
BurstSETable
NextSubScan
NextScan
EndProg