Download Campbell CSIOPC Specifications

Section 11. Programming Resource Library
chamber. The following procedure zeros the RH sensor to obtain the
calibration report shown.
Calibration Report for Air RH Sensor
Initial Calibration
1 Month Calibration
mV Output
1000
1050
Desiccated Chamber
0%
0%
Multiplier
.05 % / mV
.05 % / mV
Offset
-50 %
-52.5 %
Reading
%
0%
Send the program in EXAMPLE 11.1-1 to the CR1000. To simulate the RH
sensor, place a jumper wire between channels EX1 and SE8 (4L).
Using the CR1000KD keyboard or software numeric monitor, change the value
in variable CalibMode to 1 to start calibration. When CalibMode increments to
6, calibration is complete.
Change the mV variable to 1050, then repeat the calibration to see how drift is
easily zeroed.
EXAMPLE 11.1-1. FieldCal zeroing demonstration program.
'Jumper EX1 to SE8(4L) to simulate a sensor
Public mV
Public KnownRH
Public CalMode
'Excitation mV Output
'Known Relative Humidity
'Calibration Trigger
Public Multiplier
Public Offset
Public RH
'Multiplier (Starts at .05 mg / liter / mV, does not change)
'Offset (Starts at zero, not changed)
'Measured Relative Humidity
'Data Storage Output of Calibration Data -- stored whenever a calibration occurs
DataTable(CalHist,NewFieldCal,200)
SampleFieldCal
EndTable
11-4