Fluke DTX-1800 Technical Reference Handbook page 207

Setting
Averaging The averaging time sets the number of measurements averaged together to create the final trace.
Time Longer times reduce noise on the trace which increases dynamic range and accuracy and reveals more
details, such as smaller non-reflective events. Shorter times decrease test time, but produce a noisier
trace with less dynamic range and decreased visibility of events.
Auto: Adjusts the test parameters for a typical test time of 15 seconds per wavelength. This setting is
used for Auto OTDR mode and is the default for Manual OTDR mode.
Auto Test Time: Adjusts the test parameters for a typical test time of 5 seconds per wavelength. This
setting speeds up testing but provides less accuracy and increased deadzones.
Auto Deadzone: Adjusts the test parameters to minimize deadzones, which reveals more detail in and
around reflective events. This usually takes longer than testing with Auto or Auto Test Time selected.
Testing with Auto, Auto Test Time, or Auto Deadzone selected can take up to 3 minutes per
wavelength, depending on the fiber's characteristics.
Manual time selections: Lets you set the test time to 15 seconds, 30 seconds, 1 minute, or 3 minutes per
wavelength. The tester adjusts the test parameters to meet the selected time.
Table 7-5. Manual OTDR Settings (cont.)
Description and Selection Guidelines
Using the OTDR Module
Using Manual OTDR Mode
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