DET08CFC(/M)
Page 15
Rev B, April 29, 2015
Chapter 7 Troubleshooting
Problem
Suggested Solutions
There is no signal response or
response is slower than
expected.
Verify that the battery is inserted and has
sufficient power (>9 V)
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 detector to an oscilloscope without a
terminating resistor installed. Most general
purpose oscilloscopes will have a 10 M
Ω
input
impedance. 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 Battery
Replacement Section for more details.
Skewed Rise and Fall Times
Check to see if the battery voltage is 9 V or
greater. Make sure you are not saturating the
detector as this can lead to permanent damage.
