PAGE 14
Trace View Description
Unit of Measure
The Distance Unit of Measurement is available in Kilometer (Km), Kilo feet (Kf) or Miles (Mi). To set the Unit of Measurement,
change the unit in the test parameters.
Zoom
There are six Zoom Levels: 1x, 2x, 4x, 8x, 16x and 32x. To change the Zoom Level, tap the Zoom button on the screen. It will cycle
through the six levels. When viewing the Trace at a Zoom Level other than 1x, the active cursor is centers on the Trace Display.
When the cursor moves, the Trace moves and the cursor will remain centered.
Cursor Movement
The Active Cursor displays as a solid line and the Inactive Cursor as a dashed line. Tap the A/B button on the screen to toggle
between the two cursors to set the Active Cursor. The active cursor will snap to the position tapped on the screen, or use the
right and left arrow indicators showing in Figure 8.8 to make fine adjustments.
Dual Trace Mode
Dual trace mode is used to view and compare two traces. Both traces must be of the same range setting. To utilize the dual trace
feature, begin a new test (Auto or Custom) as normal and when selecting the desired wavelength, choose both of the available
options. Proceed to enter the rest of the test parameters as desired and then begin the test. The two wavelength tests will run
consecutively after one another. After the first completes, the second test will run.
Dual test results are only visible in the trace view screen. When viewing the trace, the first wavelength is overlaid on top of the
second wavelength trace results (in light gray). Users can swap between the two wavelengths results by tapping the wavelength
text in the bottom right corner.
Fig 8.9
EVL
B
RUN
EVL
B
RUN
Trace View Loss Measurements
2-Point Loss
2-Point Loss Measurements calculate the difference in vertical height between where the A and B cursors cross the fiber trace.
The information is located on the Trace View Screen within the A-B section of the Trace Information as shown in Fig. 8.8. It is a
quick method of checking the loss between any two points on the fiber optic link.
The 2-Point Loss Method is designed for use in noisy environments when it is difficult to attain an 4-point area that lays flat on
the backscatter before and after the cursor. It takes an average of the selected points before and after the Active Cursor and uses
the average to estimate the Event Loss. Although it is an estimation, the method may be more accurate than using the 4-Point /
LSA Loss Method in noisy environments.
