Gentec-EO UNO - Manual (Page 9)

UNO User’s Manual Revision – 6.1 8
Gentec Electro – Optics, Inc. All rights reserved
4- Slide the latch to the left to lock the connector into place.
5- Switch the UNO ON using the I/O key. The UNO displays the current wavelength for a moment
before displaying measurements. If this wavelength is not the wavelength of the laser, go to
step 6, otherwise proceed to step 7.
6- Select the proper wavelength using the λ up and λ down control keys. Then press the Save λ
control key to store the wavelength in non-volatile memory and return to the measurement
mode.
Adjusting the zero (steps 7 to 11)
7- Remove the detector’s protective cover.
Put the detector into the laser beam path. The entire laser beam must be within the sensor
aperture. Do not exceed maximum specified densities, energies or powers. For the most
accurate measurement, spread the beam across 60% to 80% of the sensor area. Leave it
there until the detector has reached its equilibrium temperature.
8- Block off laser radiation to the detector.
The power read by the UNO when no laser beam is incident on the detector may not be
exactly zero. This is because the detector is not thermally stabilized OR there was a heat
source in the detector’s field of view when you turned on the UNO, OR from the internal
electronic offset of the UNO.
9- To reset the zero, wait until the reading has stabilized and press the Zero button on the front
panel. The UNO will display “ZEro“ for a moment and then return to the normal measurement.
You are now ready to make an accurate measurement. Pressing the Zero button again will
not undo the zero; it will re-do it.
10- When you select ATT you must enter a wavelength and then press Save λ to exit.
11- Apply the laser beam to the detector. The laser must be CW for photodetectors.
Notes:
• Refer to the specific power detector documentation for complete installation and
operating instructions.
• The power detectors are thermal sensors sensitive to temperature variations.
For high-precision measurements, it is recommended to:
• Allow the power detector’s temperature to stabilize before zeroing the UNO.
• Do not touch the detector itself when handling the power detector. Touch only the stand.
• Avoid forced airflow or drafts around the detector.