TUNER User’s Manual Revision 4.2 12
Gentec Electro – Optics, Inc. All rights reserved
2 Getting Started
This section contains important information concerning the installation and operation of the TUNER.
The TUNER is delivered ready to use. Just install the 4 AA batteries, insert a compatible detector
head in the Probe Input Jack (#3 in Figure 1-2) and press the I/O key.
2.1 Power measurement procedure
1- Install the power detector on its optical stand.
2- First, slide the connector latch to the right to unlock the connector.
3- Turn the TUNER off and connect a power detector head to the TUNER using the PROBE
INPUT JACK (see Fig. 1-2). It is recommended to turn the TUNER off before connecting a
new head in order to prevent any loss of information from the detector head’s EEPROM.
4- Slide the latch to the left to lock the connector into place.
5- Switch the TUNER ON using the I/O key. The TUNER 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 8.
6- Select the proper wavelength using the Display control key to go to the wavelength display
mode, then the Range ▲ / Range ▼ control keys to select the wavelength. The TUNER
automatically stores the wavelength selection in non-volatile memory when the TUNER is set
back to the measurement display mode, so it returns to this same wavelength when it is turned
on again.
7- Return to the measurement mode by pressing the Display control key twice.
Adjusting the zero (steps 8 to 11)
8- Remove the detector’s protective cover.
9- Put the detector into the laser beam path. The entire laser beam must be within the sensor
aperture. Do not exceed maximum specified power densities. 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.
10- Block off laser radiation to the detector.
The power read by the TUNER 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 TUNER, OR the internal
electronic offset of the TUNER is not zero.
11- To reset the zero, wait until the reading has stabilized and press the Zero control key on the
front panel for at least 2 seconds. The TUNER will display “----“ for a moment and then return
to the normal measurement display. You are now ready to make an accurate measurement.
12- Apply the laser beam to the detector.
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 TUNER.
• Do not touch the detector itself when handling the power detector. Touch only the stand.
• Avoid forced airflow or drafts around the detector.
(14 pages)
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