© 2006 Wohler Technologies Inc. ALL rights reserved
10
VMDA Series User Manual P/N 821115 Rev-C.5
9 Phase Indication LEDs
The phase indication LEDs offer immediate verification of phase (polarity) relationships in stereo or mono
sources. There are three LEDs; the two smaller LEDs on top and bottom show instantaneous (fast) phase
relationships in the signal, while the center (and larger) LED will indicate the
average
phase condition. The
small top, or in-phase, LED (FAST-IN) glows (or blinks) green when signals are in phase. The small bottom , or
out-of-phase, LED (FAST-OUT) glows (or blinks) amber for out of phase signals. The large center LED (AVG)
indicates the average phase condition by glowing green for in-phase conditions, or red for out-of-phase conditions.
In general, it is sufficient to regard the center LED (average phase condition) as adequate for proper phase
monitoring. While it is normal for stereo signals to contain some intermittant instanateous out-of-phase and in-
phase conditions (small LEDs), a steady red glow of the larger center LED almost always indicates an out-of-
phase alarm condition.
FRONT PANEL CONTROLS AND INDICATORS (Cont.)
(Continued)
