Lab.gruppen C Series C 10 4X, Руководство по эксплуатации, Страница: 23 / 33

C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual
23
7.7.2 Level adjust
Step Attenuation
1 (Min) -Inf. dB
2 -Inf. dB
3 -50 dB
4 -40 dB
5 -35 dB
6 -21.5 dB
7 -17.3 dB
8 -14.7 dB
9 -12.9 dB
10 -11.4 dB
11 -10.0 dB
12 -8.7 dB
13 -7.4 dB
14 -6.0 dB
15 -4.5 dB
16 -2.7 dB
17 -0.6 dB
18 -0.3 dB
19 -0.1 dB
20 0 dB
21 (Max) 0 dB
Figure 12: Potentiometer operation range in logarithmic
steps
Level adjust potentiometers (one per channel) are
located behind the removable dust filter cover on the
amplifier’s front panel. With the dust filter cover in
place it is not possible to adjust the level settings.
The potentiometer’s operational range is 0 dB to
-Infinity in 21 steps. Attenuation is logarithmic, with
12 o’clock position being -10 dB. See the above table
for full attenuation increment information.
Use fingers or a screwdriver to adjust the potenti-
ometers.
It is not possible to adjust the individual
channel attenuation from the NomadLink
network or elsewhere on the amplifier.
7.7.3 Mute indication
Individual channel Mute is indicated by illumination of
the two yellow LEDs at the top of the channel’s LED
bargraph. If both LEDs are illuminated and all other
indications are normal, then the channel has been
muted by a command from the NLB 60E front panel
or the DeviceControl application. Otherwise, a Mute
could indicate a fault condition. (See below.)
7.7.4 Performance, Warning and fault
indicators
Power on/off •
(green) indicates that mains power
is switched on.
NomadLink •
(blue) indicates that the network
is connected. The NomadLink LED will light up
even before the mains power is connected and
switched on as it takes phantom power from the
NomadLink network cable.
Bridge mode •
(yellow) indicates if two chan-
nels are bridged using the DIP-switch on the
rear panel.
CPL, •
Current Peak Limiter (orange), when flashing
indicates the maximum possible current draw
has been reached.
CPL, •
Current Peak Limiter (orange), when constant
indicates excessive current draw caused by a
short circuit on the output or very low operational
impedance. When detected, the output will mute
for 6 seconds before re-measuring the output
impedance. This will continue until the short
circuit is removed. CPL remains constant orange
in a fault condition only when an input signal is
present.
Temperature •
(yellow) warning is indicated by a
flashing LED. If the amplifier goes into thermal
protect (output muted) the LED illuminates
constant yellow.
Vhf, •
Very High Frequency protection (yellow),
indicates that potentially harmful continuous high
frequencies have been detected on the input
signal. The output is muted.
PAL •
, Power Average Limiter (red), indicates
that the amplifier is limiting because the power
supply and/or the mains-inlet fuse has reached
maximum capability.
hardware fault •
is indicated when both the CPL
and VHF indicators light up simultaneously. The
amplifier requires servicing before being placed
back in operation.
OPERATION AND PERFORMANCE 7