38
Capricorn II Plus User Manual
2.
Alternating Display: By moving the Temperature/Humidity Display switch to the
"alternating" position, the displaywill alternate between the temperature and
humidity every four seconds.
3.
Sensor Indicator Display: Two LED lights to the right of the Temperature
display on the front panel indicate which reading ("temperature" or "humidity")
is being displayed.
4.
Units of Measure: Relative Humidity is displayed as a unit-less percentage, %
RH.
5.
Display Resolution: Normal operating resolution is 1% RH. To display relative
humidity with 0.1% RH resolution, move the Mode switch on the back panel to
the "calibrate" position.
Note: When the unit is in the "calibrate" mode, the averaging will not be performed.
The humidity display may appear unstable as a result of the lack of averaging.
C. BAROMETRIC PRESSURE
The barometric pressure measuring range is from at least 27.00 inches of mercury
(Hg) to 32.00 inches in 0.01 increments. The range in Millibars is 914 to 1084 in 1
mbar steps. The accuracy is 0.15% or better from 29 to 31 in. Hg (982 to 1050
mbar) at an ambient temperature of between 64
o
and 82
o
F (18
o
and 28
o
C.)
Each digit in the Barometric Pressure display has varying levels of importance. For
example, 29.96 in. Hg. would read:
Digit Number
1
2
3
4
Sample Reading
2
9
9
6
Digit 1 is significant, but relatively unchanging in the measurement of barometric
pressure. This digit will display a reading of either 2 or 3. Digits 2 and 3 are the most
meaningful in indicating weather activity. A change in either of these digits indicates
that a “high” or a “low” pressure weather system may be passing through the area
with a resulting effect on local weather conditions. Digit 4 is more interesting than
important. It can change due to slight variations in pressure caused by the opening
and closing of doors or windows, or the operation of fans and air conditioners.
Frequent changes in the fourth digit are usually related to changes in the immediate
environment. Slow changes are usually a true indicator of barometric pressure
variations.
Note that the rate and direction of change are normally more significant than the
actual barometric pressure level itself.
During each measuring cycle, the Capricorn II Plus will read the barometric pressure
eight times, compute the average, and update the Barometric Pressure display. The
display update will occur approximately every 12 seconds.
1.
Inches of Hg Display: For a continuous display of barometric pressure in
