OTDR Series e-Manual, D07-00-076P-RevC00 Page 84 of 107
Modifying events:
1. Ensure the Trace menu is active and the Event table is shown on the screen.
2. Use the left/right arrows to highlight the necessary event in the Event Table. Press the
Modify button on the right sidebar. A marker with two small markers will appear on the
trace. When markers and measurement is performed, click the Accept button on the right
sidebar.
• Span Begin – Position marker at end of the Launch fiber and press the green Span
Begin button to set the beginning of fiber under test.
• Span End - Position marker at end of the fiber under test and press the green Span
End (if launch box is used).
• Markers - Brings marker onto the visible area of the display.
• Modify - Changes the display to allow the user to make manual adjustments to the
event table and reanalyze.
7.5 Measure Mode
There are several methods available to manually measure fiber characteristics. Prior to
performing manual measurements, it is important you become familiar with the Markers and
Zooming capabilities of the unit.
7.5.1 Markers Controls
7.5.1.1 Marker Operation
Markers are provided to measure distances accurately. Depending on measurement mode and
viewing window, one or more markers are at the User’s disposal. The Markers can be moved
using the touchscreen or using the left/right buttons on the rubber keypad (not available on
MTTplus or FX150).
The Markers display the following:
• Distance from the start of the trace to Marker “A”
• Distance from the start of the trace to Marker “B”
• Distance in between Marker “A” and Marker “B”
Note: As you move the Markers, the distance information updates automatically.
The active Marker is depicted by two small arrows pointing inwards at the base of the Marker
The Marker is divided into a thick (bottom) and thin (top) line. To move Marker A or Marker B
individually, select and drag the Marker on the thin portion of the marker. To move both
Markers together, select and drag any Marker on the thick portion of the line.
If the Markers appear off screen, use the Markers button on the right side bar to bring and
display the Markers on screen.
If a marker is moved too close to another, both will move together to ensure minimal distance
between them.
The markers can be moved separately as well as in pair (or 5 markers simultaneously in the
LSA attenuation measuring mode).
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