Optidew Reference Instrument; Optidew Display; Selecting Which 'Screen' To View On The Display - Michell Instruments OptiCal User Manual

OPTIDEW
4

OPTIDEW REFERENCE INSTRUMENT

The OptiCal is supplied with an integrated Optidew chilled mirror reference instrument
to provide a fundamental and traceable reference measurement of the humidity within
the chamber, while being totally independent from the controlling relative humidity
probe. The advantage of this technique is to isolate the control of the chamber from
the control system of the chilled mirror sensor to provide a fast responding and highly
stable system.
4.1

Optidew Display

The Optidew reference has an integral VFD (Vacuum Fluorescent Display) mounted on
the front panel of the OptiCal instrument. To the right of the display is a single multi-
function button which enables the user to select between the Optidew's two modes of
operation and scroll through the measured and calculated parameters such as ambient
temperature or relative humidity, and indications of system status. The mode can be
either
LOCAL
as temperature and relative humidity are displayed on the VFD screen. In
Mode the display is inactive and the RS232 output is enabled and available via the 9 pin
RS232 communication connector.
Start-up banner
When power is applied to the OptiCal, the Optidew reference display will initially show
test characters for approximately 0.5 seconds, after which the start-up banner will be
displayed for approximately 7 seconds. The instrument will start up in
which case the display is active and the RS232 output is not available.
Remote Mode for communication with a PC
On start-up, the Optidew reference is automatically in
has stopped showing the start-up banner it is possible to change between the two modes
by simply holding down the
In Mode the display will show
REMOTE
with a PC via the RS232 port is possible.
Mode
LOCAL
Mode
REMOTE
4.1.1

Selecting Which 'Screen' to View on the Display

After the start-up banner has ended, the display will show Screen 1. This displays
the status of the Optidew chilled mirror reference instrument, i.e. DCC and ambient
temperature. To scroll to Screen 2 - fi rmly but momentarily press the multifunction
button. It is not possible to view any other screens until the
complete. Note that there may be a small delay before the display changes to the next
screen - this is normal. After the
All eight screens can now be accessed by depressing the multi-function button.
16
or . In
REMOTE LOCAL
DISPLAY CONTROL
rh 49.9 %
t 10.0 °C
* REMOTE MODE *
DATA HOLD
OptiCal User's Manual
Mode the integral display is active and data such
LOCAL
button for approximately 7 seconds.
, indicating that communication
REMOTE MODE
period has fi nished, Screen 3 will appear.
97079 Issue 9.2, March 2016
REMOTE
Mode in
LOCAL
Mode. Once the display
period is
DATA HOLD