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2.1.6 The Meter Bridge
The 24, 32 and 40 channel versions of the PM1800
each are equipped with a total of 13 VU meters. Due to
its compact size, the 16 channel version has just 10
meters, though it still is capable of displaying the level
of the same 20 circuits as the larger console main-
frames, thanks to selector switches. The Stereo L & В
meters on all models are extra large, and always dis-
play the stereo output, whereas the other meters are
standard size and most can be switched to multiple
sources. Each meter is illuminated, has true VU bal-
listics to indicate approximate loudness. In addition, the
Stereo L & R meters each include a red "PEAK" LED
which responds to instantaneous levels that are beyond
the scale of the meter. The PEAK LED turns on 10 dB
below the clipping point. Assuming the meter is moni-
toring an output with + 24 dBm maximum output ca-
pability, the PEAK LED will turn on when the instanta-
neous level reaches + 14 dBm. Since the standard VU
meter scale goes only to +3 VU (which is +7 dBm),
the PEAK LED turns on when the level is 7 dB above
maximum meter scale. Bear in mind, however, that a
brief transient that may cause the PEAK LED to flash
on may be too fast for the meter needle to respond. it
is not unusual with plucked or percussive instruments,
for example, for the peak level to be 20 to 30 dB above
the average level.
Since there are 3 fewer meters on the 16-channel
version, it utilizes 3-position switch banks over six of
its meters, as contrasted to the 2-position switch banks
on the larger consoles. Rather than duplicate the dis-
cussion of what each switch does on each console
model, we are simply providing a discussion of each
different type of meter switch. The accompanying il-
lustrations (Figures 2-6 and 2-7) show where the
switches are physically located.
NOTE:
The nomenclature at the bottom edge of the meter
bridge refers not to meter functions, but instead serves
to label the console's modules.
73. GROUP 1-8
The eight meters with this function monitor corre-
spondingly numbered GROUP OUTputs. (The GROUP
8 meter on the 16-channel mainframe has no other
functions associated with it.) As shipped, the signal is
derived after the GROUP MASTER Fader and GROUP
OUT ON/off switch. The meter feed can be internally
jumpered to be derived from a point just before the
GROUP OUT ON/off switch. Refer to the OPTIONAL
FUNCTIONS section of this manual.
74. AUX1-6
The six meters with this function monitor corre-
spondingly numbered AUX SEND outputs after the Aux
Send Master LEVEL control and ON/OFF switch.
75. MATRIX 1 -4
The four meters with this function monitor corre-
spondingly numbered MATRIX outputs after the MA-
TRIX MASTER level control and ON/OFF switch.
76. CUEL&R
The pair of meters with this function monitor the left
and right Cue outputs.
77. OSC OUT
This meter displays the signal at the Oscillator output
connector. it DOES NOT necessarily show when the
oscillator is turned on and applying signal to the console
busses; it only enables you to monitor a signal if the
oscillator is on AND the OSC OUT is switched on [50].
78. STEREO (L & R)
These two larger meters monitor the left and right
sides of the STEREO OUTputs.
2-18
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