OptiCal User’s Manual
Michell Instruments
23
APPLICATION SOFTWARE
5
APPLICATION SOFTWARE
The application software is an interface to the OptiCal. It provides a display of the
measured and calculated parameters, system status, charting and logging, statistical
information and a facility to view and change the system parameters. To set up the
Digital Communications refer to Section 3.4.1.
NOTE: Communication with the software is only possible when the unit is in
REMOTE Mode
(see Section 4.1).
5.1 Virtual
Hygrometer
The
Virtual Hygrometer
window provides a display for the instrument by showing the
measured parameters and status.
Figure 20
Virtual Hygrometer Window
The
Humidity
display has the ability to show dew point (°C/°F), %RH, gm
-3
, gkg
-1
,
∆
(t – t
dp
) or a
W
by clicking on the
Change Units
button. Selecting one of these options
will show the measured or calculated value, but will not change the Channel 1 mA
output of the instrument, as this can only be done via the Parameter Setup window
(see Section 5.3). When the software is executed, it will default to the present setting
of Channel 1 mA output. The ambient temperature is constantly shown in the lower
display.
NOTE: The
humidity
display will blink if the dew point is higher than
the temperature, e.g. during DCC. This is normal and not a fault.
Mirror Condition
indicates the amount of signal received back from the mirror, which
includes both the level of moisture and contamination on the mirror surface. In
DCC
mode this display will only show the amount of mirror contamination and, if greater
than 80% after a
DCC
, an optics alarm condition will initiate.
Instrument status is shown via the
fi
ve colored indicators. In
DCC
(initiated automatically
or by the
DCC Initiate
button), both the
DCC
and
Hold
indicators will illuminate
showing the
DCC
status and the hold on Channel 1 mA output. When the
DCC
period
ends, the
DCC
indicator will turn off leaving only the
Hold
indicator illuminated until the
system enters the measurement phase. The
Fault
indicator will illuminate after a
DCC
if cleaning of the mirror surface is required. Refer to Section 4.2 for details of mirror
cleaning.
