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16-10-200716-10-2007
MKIV OPERATOR’S MANUAL
97
This report indicates that at 19:01:12 (C.U.T.: Co-ordinated Universal Time, also known as GMT), a
maximum spectral-matching correlation coefficient of 0‘987 was obtained for an (interpolated)
mercury calibration point of 298.47. The operational setting of the micrometer is arrived at by
subtracting the 'offset' retrieved from the instrument Constants File (the offset is 12 in this case)
from 298.47, then truncating the result. 9540 is the peak count across all 24 observation points.
The micrometer is automatically repositioned to the operational point (step #286 in this case), and
the test ends.
Should the interpolated calibration point fall outside the [147.00..149.99] acceptance range, the
micrometer is automatically repositioned at the truncated calibration minus the offset and the test is
repeated until the interpolated calibration point lies between 147 and 150. A sample printout for an
HG test which converged in two iterations is shown below (the offset for this instrument is 10 steps):
BREWER TEMP = 26 C ( 3.52 V)
103409 ( .9919 ) HG CALD AT STEP # 296.1 SET TO STEP # 286 60871
103651 ( .9927 ) HG CALD AT STEP # 287.0 SET TO STEP # 286 61019
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%
MgCl
2
solution is 32.8%
LiCl solution is 11.3%
Dry N
2
is 0%
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
APPENDIX F FACTORY TESTS
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