Specifications

Section 11. Programming Resource Library
11-4
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
sens
or, 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 'Excitation mV Output
Public KnownRH 'Known Relative Humidity
Public CalMode 'Calibration Trigger
Public Multiplier 'Multiplier (Starts at .05 mg / liter / mV, does not change)
Public Offset 'Offset (Starts at zero, not changed)
Public RH 'Measured Relative Humidity
'Data Storage Output of Calibration Data -- stored whenever a calibration occurs
DataTable(CalHist,NewFieldCal,200)
SampleFieldCal
EndTable