4.5. Energy or Average Power Measurement
Warning:
Do not exceed maximum sensor limits for power, energy, power density
and energy density as listed in tables 5 and 6 in section 10.2 of the manual,
Sensor Specifications. Otherwise, there is a risk of damaging the absorber.
With the pyroelectric sensor, you have been supplied a test slide with the
same coating as on your pyroelectric detector. You can also obtain this slide
from your dealer. You should use this slide to test the damage threshold with
your laser pulses. If the slide shows damage, then either enlarge your beam
or lower the laser energy until damage is no longer seen.
4.6. To choose Energy or Average Power Measurement
To switch from the main energy measurement screen to power measurement,
press “Power”. To switch from the main power measurement screen to energy
measurement, press “Energy”.
V
ega Quick Refer
ence
VEGA
Quick Reference
Ophir Optronics Solutions LTD.
Science Based Industry Park P.O.B. 45021, Jerusalem 9145001, Israel
Phone +972-2-5484444
https://www.ophiropt.com/photonics
rev 1.84-3/17.Feb.19/be Ophir P/N 1J06048
1
Getting Started
The Vega is equipped with “soft keys”. That is, the functions of
the keys change as indicated by the legend above each key. It
is also equipped with 4 navigation keys and a round enter key in
the center.
To connect sensor to the Vega meter:
Insert the 15 pin D type connector of the measuring sensor
cable into the socket marked “Head Input” on the rear panel of
the Vega meter.
To switch the Vega on:
Briefly press the on/off switch (bottom-most key). The unit will
switch on, and the display will appear. Note that the sensor
must be plugged in before the unit is switched on. The backlight
for the Vega’s LCD can be configured to toggle between full
and partial illumination. Similarly, the keypad lighting can be
configured to toggle between on and off. This toggling will be
performed by briefly pressing the on/off switch after the Vega
has been switched on. To switch the Vega off, press the on/off
switch and hold it for ~ 3 seconds until the display blanks.
If you wish to save the current Vega configuration, use the
“Configure” function. (See section 2.3.2.).
To set the display modes:
1. Disconnect the sensor and switch off then on again. “Head
Disconnected” will appear.
2. Select “Display Mode” and enter. Choose the desired mode,
press save.
The Vega will now be in this display mode for
all sensors.
3. Select “Date” and press the enter button. Using the
navigation keys set to the correct date. Press save.
4. Select “Time” and enter. Using the navigation keys, set to
the correct time. Press save.
5. For adjusting RS232 baud rate and An. Output voltage see
the main manual.
4
Pyroelectric or Photodiode Energy Sensors
4.1. Zeroing Instrument against Sensor
For most accurate calibration, you should zero the pyroelectric sensor
against the Vega it is being used with. Proceed as follows:
Make sure the sensor is in a quiet environment and not subject to pulsed
radiation. Plug sensor into Vega and turn on. Press “Menu”, select “Zero”
and enter. Press “Start”. When “ZEROING COMPLETED” appears, press
“Save”.
4.2. Changing Chosen Wavelengths (metallic type only)
1. Select “Laser” and Enter.
2. Select the wavelength you wish to use and enter. To save this
wavelength as the startup default, press “Save” before exiting.
3. To modify one of the wavelengths, select the closest wavelength and
press the right navigation key.
4. Using the up/down keys to change the numbers and the right/left keys
to move to the next number, modify to the wavelength you want.
5. When finished, press “Save” and exit. If you only want a temporary
change, exit without “Save”.
4.3. To Set Type of Laser Being Used
From main measurement screen, select “Laser” and enter. Choose the
desired laser type or wavelength. To save this as the startup wavelength,
press “Save” before exiting.
4.4. Setting Startup Configuration
1. Turn on the Vega with the sensor connected, select “Menu” and Enter.
Select “Configure”.
2. With the navigation keys select “Startup Mode”, select “Power” or
“Energy” as the startup mode. Press the Enter key to exit.
3. With the navigation keys select “Display Mode”. Press the Enter
key and select the type of screen you wish to start up with. Press
“Save” and exit. If you do not want to save this as the startup mode
but only change for now, exit without save. (This choice is saved in
the instrument and not the sensor so the Vega will start up from the
screen selected for all sensors).
4. Select “Energy Range”, press Enter and choose the manual energy
range you wish to be the default.
5. Select “Average” to select the average power period over or select the
default, “NONE”.
6. If the sensor is a diffuser sensor, set diffuser to IN or OUT.
7. Select “Max Pulse Len” and choose the shortest pulse length setting
that is longer than your laser’s pulse length.
Warning:
Incorrect readings will result if pulse length is not set up correctly.
8. Select “Laser” and select the laser type you wish to be the default.
9. Press “Save” to save all present settings then “Exit” to get back to the
main measurement screen.
Note:
Some sensors have only the long pulse setting for all pulse lengths.
In that case N/A appears. For further details on configuration see Sections
6.2 and 6.3 of the manual.
