Electro-Optics Technology, Inc.
Electro-Optics Technology, Inc. | 3340 Parkland Ct. Traverse City, MI 49686 USA
eotech.com | sales@eotech.com | 231.935.4044
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II. Operation of your EOT Amplified Photodetector
A. Caution: Eye safety precautions must be followed when utilizing any equipment used
in the vicinity of laser beams. Laser beams may reflect from the surface of the
detector or the optical mount and caution must be exercised.
B. Mount the detector to an optical stand by the mounting holes on the bottom of the
detector housing. An 8/32 nylon standoff is included to isolate the detector from the
optical stand if noise is generated due to grounding through the stand.
C. Adjust the voltage of the oscilloscope to 100 mV/division before connecting the
detector.
D. Connect the detector to the oscilloscope using a 50 Ω coaxial cable that one meter or
less.
E. Use the 50 Ω termination input of the oscilloscope. If the oscilloscope does not have a
50 Ω input, connect the coaxial cable to a 50 Ω terminator and connect this to the
oscilloscope’s 1 MΩ input.
F. When possible, use a scatterplate (white paper works) to integrate the laser beam.
Focus on the active area only if you need increased sensitivity.
G. If the full bandwidth of the detector is not needed, use low-pass, bandpass, or high-
pass filters to remove excess noise.
III. Troubleshooting
A. No signal is seen the first time the detector is used.
1. Is the AC power supply plugged in?
2. Is the detector terminated into 50 Ω at the oscilloscope?
3. Is the wavelength of the laser within the spectral range of the detector?
4. Is the signal high off the scale on the oscilloscope?
5. Inspect the diode for possible damage.
6. If increasing the incident power does not result in a higher voltage output, the
detector is probably saturated. Check the photodetector’s data sheet for the
Maximum Linear Rating specification.
7. Are all the connectors securely in place?
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