18
THE LEVEL METER
The sensitivity of the “OUTPUT LEVEL“-dis-
play is individually adjustabel and therefore
indicated in dBr (relative).
The level meter is designed as a sector of a
circle consisting of 16 LEDs vaulting over the
“GAIN FINE”-control.
The display law is semi-logarithmic with 3 dB
gaps between –36 … -12 dBr, 2 dB gaps
between –12 … -4 dBr and 1 dB gaps between
–4 … 0 dBr.
The range from –36 … -8 dB consitst of green
LEDs, while the range from –6 … -2 dBr is
displayed by yellow LEDs. The LEDs for –1
dBr and 0 dBr are red.
The full-wave peak detector (PPM) accurately
controls the display at DIN specifications, with
a rise time of <10 milliseconds and 1,5
seconds release time for a 20 dB level change.
Behind the drilling denoted "METER-ADJUST"
on the front panel, a trimmer accessible with a
small screwdriver is provided for display range
adjustment.
NOTE:
The standard factory setting is +15
dBu output level for a 0 dBr display.
THE CLIP INDICATOR
The red “CLIP”-LED is situated near to the
“GAIN-COARSE”-control.
It starts flashing at about +20 dBu and thus
reliably warns against internal overload. The
trigger is fixed and may not be altered.
THE OUTPUTS
In its standard version, the MIC AMP F355 is
equipped with two electronically balanced
output per channel.
All outputs are equipped with XLR sockets and
situated on the rear panel.
XLR wiring corresponds to international
standards with
- Pin 1 = ground,
- Pin 2 = + (in phase) and
- Pin 3 = - (out of phase).
NOTE:
In case of unbalanced termination
neither the positiv nor the negative
phase may be tied to ground. To
prevent unwanted distortion, the not
used output pin should remain open.
In case of unbalanced termination the
output level is reduced by 6 dB !
THE OPERATION
(1 of 2 Modules)
