Specifications

Section 3. CR3000 Measurement Details
3.3.2 Measuring the Necessary Settling Time
The CR3000 can measure the time required for a particular sensor/cable
configuration to settle. This is done by making a number of measurements
with different settling times. Looking at the series of measurements it is
possible to see the settling of the sensor signal.
The following example demonstrates measuring the settling time for a
differential voltage measurement. If you are not yet familiar with CR3000
programming, you may want to read Section 4 before trying to follow the
example.
The series of measurements on the sensor is made with separate measurements
for each settling time.
Before the program to measure the settling time is run, the sensor with the
cable that will be used in the installation needs to be connected and the sensor
needs to be stabilized. If the sensed value is changing rapidly it will be
difficult to separate the settling time from true changes in the value measured.
The following program measures the settling time on a full bridge pressure
transducer.
'CR3000 Series Datalogger
'Program to measure the settling time of a sensor
'measured with a differential voltage measurement
Public PT(20) 'Variable to hold the measurements
DataTable (Settle,True,100)
Sample (20,PT(),IEEE4)
EndTable
BeginProg
Scan (1,Sec,3,0)
BrFull (PT(1),1,mV20,1,Vx1,1,2500,True ,True ,100,250,1.0,0)
BrFull (PT(2),1,mV20,1,Vx1,1,2500,True ,True ,200,250,1.0,0)
BrFull (PT(3),1,mV20,1,Vx1,1,2500,True ,True ,300,250,1.0,0)
BrFull (PT(4),1,mV20,1,Vx1,1,2500,True ,True ,400,250,1.0,0)
BrFull (PT(5),1,mV20,1,Vx1,1,2500,True ,True ,500,250,1.0,0)
BrFull (PT(6),1,mV20,1,Vx1,1,2500,True ,True ,600,250,1.0,0)
BrFull (PT(7),1,mV20,1,Vx1,1,2500,True ,True ,700,250,1.0,0)
BrFull (PT(8),1,mV20,1,Vx1,1,2500,True ,True ,800,250,1.0,0)
BrFull (PT(9),1,mV20,1,Vx1,1,2500,True ,True ,900,250,1.0,0)
BrFull (PT(10),1,mV20,1,Vx1,1,2500,True ,True ,1000,250,1.0,0)
BrFull (PT(11),1,mV20,1,Vx1,1,2500,True ,True ,1100,250,1.0,0)
BrFull (PT(12),1,mV20,1,Vx1,1,2500,True ,True ,1200,250,1.0,0)
BrFull (PT(13),1,mV20,1,Vx1,1,2500,True ,True ,1300,250,1.0,0)
BrFull (PT(14),1,mV20,1,Vx1,1,2500,True ,True ,1400,250,1.0,0)
BrFull (PT(15),1,mV20,1,Vx1,1,2500,True ,True ,1500,250,1.0,0)
BrFull (PT(16),1,mV20,1,Vx1,1,2500,True ,True ,1600,250,1.0,0)
BrFull (PT(17),1,mV20,1,Vx1,1,2500,True ,True ,1700,250,1.0,0)
BrFull (PT(18),1,mV20,1,Vx1,1,2500,True ,True ,1800,250,1.0,0)
BrFull (PT(19),1,mV20,1,Vx1,1,2500,True ,True ,1900,250,1.0,0)
BrFull (PT(20),1,mV20,1,Vx1,1,2500,True ,True ,2000,250,1.0,0)
CallTable Settle
NextScan
EndProg
3-7