Electro-Optics Technology, Inc.
3340 Parkland Ct. Traverse City, MI 49686 USA
(231)935-4044 ׀ (800)697-6782 ׀ sales@eotech.com ׀ 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. Clean the end of the fiber ferrule and connect to the laser.
D. Connect the detector to the oscilloscope using a coaxial cable designed for 10GHz operation. The
DC Monitor cable can be a general purpose cable.
E. Use the 50Ω termination input of the oscilloscope.
F. Connect the DC Monitor to a high impedance device, such as a multimeter. Set the device to
millivolts or volts. The output of the DC Monitor converts the average photodiode current to a
voltage output of 1mV/uA. The DC Monitor output has an offset voltage of less than 70mV.
G. Note that the external power supply is a 5VDC regulated supply with a positive center pin. Using a
supply other than 5VDC could damage the detector.
H. After being certain that the damage threshold of the detector is not exceeded, turn on the laser.
III. Troubleshooting
A. No signal is seen the first time the detector is used.
1. Is the power switch on? Is the external power supply connected?
2. Is your signal a CW signal? If so, there will not be a signal output present because the detector is
AC coupled. There would be an output from the DC Monitor.
3. Be certain that the signal is not high off scale on the oscilloscope.
4. Is the wavelength of the laser within the spectral range of the detector?
5. Has a 50Ω termination input been used?
6. Make sure the fiber radius is greater than 1 inch. Inspect fiber for damage.
7. Check the end of the fiber ferrule for cleanliness or damage.
8. 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. Recheck if the voltage is present at the external power supply plug.
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