man_digiflex_com_en_02_5.doc 37
3.8.7 Mode IFL
This mode (Intermittend Fault Location) is for detecting faults which occur
only intermittent. After this mode has been activated, reflection
measurements are permanently carried out and displayed on top of each
other on the screen. The range of differences (envelope) between the
maxima of the individual reflection tests is filled up. We recommend to use
an external power supply when performing a long-term test.
Press key Mode and set the rotary encoder to IFL to activate this mode.
Press key Start to conclude testing, the display reads
top left. Pressing
key Start one more time starts another test run; the display
reads top
left.
Fig. 12
3.8.8 Distance depending Amplitude correction
Due to the attenuating characteristics of each cable, any signal is more and
more attenuated the longer the distance to the point where the reflection
takes place. If in a cable there are two points of fault of identical size which
are at a certain distance from one another, the echo by the more distant
fault will be noticeably smaller than that by the nearer fault. It may even
happen that due to the attenuation of the cable a strong fault at a long
distance is displayed with a smaller echo amplitude than a small fault from
near-by fault the echo of which is scarcely attenuated. This may lead to
misinterpretations.
The
Digiflex Com has a distance-dependent amplitude correction mode
(amplitude correction) which allows echos of identical size to be displayed
with identical echo amplitude irrespective of their distance to the
Digiflex
Com
. This makes the assessment of reflectograms much easier. Press 2nd
Gain to activate amplitude correction; use the rotary encoder to set the
amplitude correction factor.
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