28 man_digiflex_com_en_02_5.doc
3.6 Main Menu
Main Menu will appear automatically after the Digiflex Com has been
switched on. In this menu measurements are taken employing the device
settings that were in effect when the device was used last time. Most
functions of
Digiflex Com can be started directly from menu Measurement
by means of the keys or rotary encoder as described in section 3.3.
3.7 Compensation of Initial Reflection
Use key Comp and the rotary encoder to adjust compensation such that
the initial reflection is suppressed on the display. In principle this
adjustment should be made in order to provide for optimum matching of the
Digiflex Com to the impedance of the respective cable so as to be able to
detect and locate a fault at close range, i.e. at a distance of up to 10
meters.
When a faultless pair of conductors of the same type of cable as the faulty
one is available and when it is connect to sockets L2, the impedance of the
faultless cable is used for reference in mode Diff. In this case
compensation is not operational and matching is guaranteed. Use
compensation when no faultless pair of conductors is available. Switch to
mode L1 or L2 according to the socket pair used and select display mode
”DUAL”. Set cursor to distance zero and adjust compensation such that the
upper image of the reflectogram is displayed as a horizontal line, if
possible, and the initial reflection shown in the lower window of the display
shows as small as possible. For facilitating the setting procedure, first set
gain to 0 dB for coarse balancing and then increase it for doing the fine
adjustment.
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