Electro-Optics Technology, Inc.
3340 Parkland Ct. Traverse City, MI 49686 USA
(231)935-4044
׀
(800)697-6782
׀
׀
www.eotech.com
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B.
Mount the detector to an optical stand by the mounting holes on the bottom of the detector housing.
C.
Adjust the voltage of the oscilloscope to 100mV/division before connecting the detector. On models
with >3V bias supply, the signal may be large enough to damage the oscilloscope if this is not done.
D.
Connect the detector to the oscilloscope using a 50Ω coaxial cable that one meter or less.
E.
Use the 50Ω termination input of the oscilloscope. If the oscilloscope does not have a 50Ω input,
connect the coaxial cable to a 50Ω terminator and connect this to the oscilloscope’s 1MΩ input.
F.
After being certain that the damage threshold of the detector is not exceeded, place the detector in
the center of the laser beam.
III.
Troubleshooting
A.
No signal is seen the first time the detector is used.
1.
Be certain that the signal is not high off scale on the oscilloscope.
2.
Is the wavelength of the laser within the spectral range of the detector?
3.
Has a 50Ω termination input been used?
4.
Try moving the detector within the laser beam.
5.
Is there enough light (see sensitivity spec on the data sheet) incident on the detector to generate a
signal?
B.
A signal has been previously obtained, but not currently.
1.
Try steps listed under A.
2.
Inspect the active area of the
photodiode
for any signs of damage.
3.
Try a higher input termination on the oscilloscope, but remember to return to 50Ω if this does not
work.
4.
Test the power supply:
a.
Units with internal batteries will typically operate for several years, but operation with CW
or high rep rate lasers can drain the batteries much faster.
If a load is present at the output,
current will be drawn from the batteries, so disconnect the
BNC
when not in use.
Remove top cover to replace the 3V lithium cells with Duracell Model DL2430, positive side
down.
b.
Units with an external power supply should at least receive the voltage that is printed on the
plug.
