4-3
IM AQ1200-01EN
Measuring Optical Pulses
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Index
App
4.2 Performing Averaged Measurements
In averaged measurements, the data that is acquired from each pulse is averaged and displayed. By
performing averaged measurements, you can improve the signal-to-noise (S/N) ratio.
This is effective when you want to detect faint events that are buried in noise.
WARNING
During measurement, the AQ1200 optical pulse output port transmits light, so do not remove
the optical fiber that is connected to this port. Visual impairment may occur if the light enters
the eye.
Procedure
Starting and Stopping Measurements
1.
Using the
rotary knob
and
ENTER
, select
OTDR
.
2.
Press
AVG
to start the measurement and display the measured waveform on the screen. The
soft key menu switches to the averaged measurement menu. During measurement, a value
that indicates the progress of the averaging is displayed. When the averaging completes as per
the conditions that you have specified, the measurement finishes automatically. If you press
AVG again during an averaged measurement, the measurement will stop.
During measurement, a mark appears on the display to indicate that the laser light is on.
Press to configure marker settings.
(See section 6.1.)
Waveform display screen
(See section 5.1.)
Explanation
Averaged Measurement
A progress bar is displayed during averaged measurement. When the measurement finishes, the
progress bar stops automatically. If you set Avg Duration to Auto, the duration to average over is
displayed at the top of the screen. If you specify a setting other than Auto, a value that indicates the
progress is displayed.When the measurement completes correctly, 100% is displayed. The time that
the measurement takes to complete varies depending on settings such as the distance range and the
average count.
If you are using markers to perform an averaged measurement, when the measurement completes
correctly (100%), the AQ1200 automatically closes the marker measurement screen.
If Event Auto Search is set to Auto, the event search screen is displayed when the measurement
completes correctly.
Progress bar at 71%
Duration to average over
You can configure the AQ1200 to automatically save measured data when an averaged measurement
completes. For the setup procedure, see section 3.5.
