MKIII OPERATOR'S MANUAL
108
Enter 'y' if you want to update the calibration value; type 'n' if you feel the test was unsatisfactory
for any reason or if the value hasn't changed. A timestamped calibration record will be printed:
AZ STEPS/REV = 14675 AT HH:MM:SS
The Azimuth Tracker then returns to the solar azimuth and the previously displayed menu will
appear.
THE HUMIDITY SENSOR TEST
The Honeywell HIH-3605-A-CP sensor is a monolithic IC humidity sensor that provides a
proportional voltage output to relative humidity. The sensor is buffered by an Op Amp and the
output is connected to one of the analog input channels of the A/D converter. A temperature sensor
is located near the humidity sensor to provide temperature compensation for the device. The two
measured values, relative humidity and temperature allow the absolute humidity to be calculated.
The humidity sensor is supplied with a sensor specific data printout. The values of the data printout
are entered into a formula, which calculates the moisture content inside the instrument.
The Calibration confirmation test consists of placing the sensor in a sealed container with a variety
of water saturated salts that result in known, and accurate, RH values.
NaCl solution is 75.3%; the measured RH using the above formulas is 75.7%
MgCl
2
solution is 32.8%; the measured RH using the above formulas is 32.6%
LiCl solution is 11.3%; the measured RH using the above formulas is 12.3%
Dry N2 is 0%; the measured RH using the above formulas is 0.07%
These results show that the sensor is well within the range of its specifications
Method:
Attach the data printout from the humidity sensor container to this document.
Enter the values of origin and slope into the configuration file of the instrument.
Confirm normal operation of the instrument through the use of the routines TE and AP. Refer to the
operators manual for specific use of these routines.
Model: IH-3605B
Channel: 189
File 98080318
Wafer: thunder
MRP: thunder
Pin 3: +5 VOLTS PRECISION SUPPLY
Pin 2: E+ SIGNAL OUTPUT
Pin 1: NEGATIVE or POWER COMMON
HYCAL Sensing Products
Linear output for 2% RH accy @25C:
Honeywell Inc.
Zero offset = 0.868 V
9C Founders Blvd
Slope = 28.981 mV / %RH
El Paso TX 79906
RH = (Vout – 0.868) / 0.290
Calculated Values at 5V:
Radiometric response for 0 to 100%RH:
Vout @0%=0.868 @75.3%=3.050 Vout = Vsupply * (0.1736 to 0.7533)
NaCl solution is 75.3%, the measured relative humidity is %
MgCl
2
solution is 32.8%, the measured relative humidity is %
LiCl solution is 11.3%, the measured relative humidity using is %
Dry nitrogen solution is 0%, the measured relative humidity is %
APPENDIX F FACTORY TESTS
Summary of Contents for Brewer Mk III
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