OPHIR vega User Manual page 28

For thermal and photodiode sensors in power mode, the
analog output is continually updated 15 times per second
with the latest power measurement. For thermal sensors
in single shot energy mode, the analog output can be
configured to be held fixed until the next pulse triggers or
to be released when ready to measure the next pulse. For
pyroelectric sensors, the analog output is updated at up
to 10 times per second with the latest pulse
3.5.4. Clock Settings
The Vega is equipped with a real time clock which will
show the date and time. This clock will also allow the
Vega to query the sensor attached and notify you if the
sensor is due for calibration.
To set the clock, select "Date" and enter. First select the
month with the up/down navigation keys, then move to
the date with the right/left navigation keys and so on.
Save and enter. Do the same with the time.
3.5.5. Zero Adjustments
In the Vega, all adjustments, including zeroing internal
circuits, are done from the software. This ensures simple
and accurate realignment. It is recommended to re-zero
the Vega every 2 months for best performance. The
simple zeroing procedure follows.
1. If a sensor is connected, disconnect the sensor, turn
off the instrument then back on again so the Vega
can identify that no sensor is connected. "Head
Disconnected" will be displayed.
2. Let the Vega run for at least 30 seconds before
performing zero adjustment.
3. Press "Zero".
4. Make sure the instrument is not in an electrically
noisy environment and is undisturbed. Press "Start"
and wait for message, "ZEROING COMPLETED". Now
press "Save" and the new zero will be saved. Press
"Exit" to return to the main screen.
27
energy.