OptoTest OP940-SW, Инструкция по эксплуатации

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OP940-SW
Front Panel Operation
Scan Mode
Scan mode creates OTDR-style scans as a means of diagnosing problems with insertion
loss and return loss reference and measurement. The unit can perform an individual scan
or continuously scan a distance of 20m at a time. This mode is not intended to be used
for measurement, or high-precision OTDR fault-finding, but as a tool that operators can
use in diagnosing roughly where problematic reflections are located to expedite resolution
of technical difficulties.
On the Scan Mode screen, the operator will notice a pair of horizontal and vertical axes.
The vertical axis indicates the size of the reflection while the horizontal axis indicates the
distance of the reflection from the front panel. The horizontal axis is marked in increments
of 1 meter with labels every 5 meters.
Parallel to the vertical axis are two markers: one to indicate the location of the front panel
and another to indicate the location of the on-screen cursor. The front panel marker will
always be at 0.0m and can be useful as a “landmark” for the operator.
In Scan Mode, the operator can control several unique options such as the pulse intensity
and gain setting of the return loss module. By adjusting the pulse intensity from Low to
High, the operator will be able to view reflections in the range of about 30dB to 80dB
rather than the range of 10dB to 30dB which Low mode covers.
The gain setting determines how sensitive the return loss meter will be when scanning.
The higher the number of the gain setting, the more sensitive the meter is to detect smaller
reflections. This means that a large reflection will saturate the meter in a higher gain setting
and a smaller reflection may not show up at all on a lower gain setting.
This mode also allows users to manually define reflection positions for use in RL
measurements on other operation screens.
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