Audio Developments AD146 - Manual (Page 27)

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The meters are to broadcast specification with switchable functions; PPM and VU
movements are available to choice.
The upper meter (1) reads battery status BATT (11), A and C output levels and
monitor 1 left-output level.
The lower meter (2) reads B and D output levels and
monitor 1 right-output level. The monitor 1 signal will be the one (or mix) selected on
the monitor module.
LED (10) illuminates when the mixer is switched ON. Should the internal DC voltage
fall below the safe operating level, this LED will flash.
Meter illumination is available via switch (14).
Line-up tone may be selected between 1kHz and 10kHz via switch (17). Tone will be
continuous on A, B, C, D unless interrupted tone is selected (18); in which case tone
will be continuous on A and/or C but will appear in 3 second bursts on B and/or D for
identification of the right-hand signal path. When tone is selected to A & B (3) and/or
C & D (20), it will replace any other signal on those outputs.
A matrix amplifier may be switched into the A/B pair of outputs (4) and the C/D pair of
outputs (19). See M-S NOTES for further information.
Limiters may be switched into A and B outputs (6) with their actions being monitored
by LEDs (7). LINK (5) links the pair of limiters for parallel tracking when A and B are
used as a stereo-output pair. Similar limiters are provided for C and D outputs. Limiter
threshold is set at the factory to PPM6 (+8dBm) as standard.
A, B, C, D output faders by Penny & Giles (8), (9), (24), (25) are calibrated at the top
of their travel to PPM4 with a line-output level of 0dBm. (Fader ganging clips are
available for stereo use.)
(NOTE: Metering of main outputs is performed at the input of the output transformers.
Metering of monitor 1 is pre monitor-output potentiometer.)