GaP Biased Detector
Chapter 6: Troubleshooting
Rev A, December 27, 2017
Page
11
Chapter 6 Troubleshooting
Problem
Suggested Solutions
There is no signal response.
Verify that the power is switched on and all
connections are secure.
Verify the proper terminating resistor is installed if
using a Voltage measurement device.
Verify that the optical signal wavelength is within
the specified wavelength range.
Verify that the optical signal is illuminating the
detector active area.
Connect the DET to an oscilloscope without a
terminating resistor installed. Most general
purpose oscilloscopes will have a 1 M
Ω
input
impedance. For visible detectors, point the
detector toward a fluorescent light and verify
that a 60 Hz (50 Hz outside the US) signal
appears on the scope. If so the device should
be operating properly and the problem may be
with the light source or alignment.
There is an AC signal present
when the unit is turned off.
The detector has an AC path to ground even with
the switch in the OFF position. It is normal to
see an output response to an AC signal with
the switch in this state. However, because the
detector is unbiased, operation in this mode is
not recommended.
The output appears AC coupled
with long rise times and the
power switch ON.
This is usually an indication that the battery level is
low and needs to be changed. See the Battery
Check and Replacement Section.
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