AudioControl SA-3051, Руководство по эксплуатации

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SA-3051/SA-3052
Front and Rear Panel Features
Figure 2.1. SA-3051/SA-3052 Front Panel with digital SPL readout
Front Panel
lED D
iSplay
The left portion of the display shows the one-third octave energy content of the input signal from 25 Hz
to 20kHz. Each column within the display represents one one-third octave band. The band centers are
marked on the bottom of the screen.
The right-hand end of the display indicates the setting of the
D
B
switch, and consequently the amount of
change in the input signal that each LED on the left- hand side of the display represents.
The far right portion of the display indicates the sound pressure level (SPL), relative to the settings of the
D
B
switch and control.
p
owEr
S
witCh
Depressing the
p
owEr
switch to the right turns the SA-3051/SA-3052 on. Pressing it to the left turns it
off.
l
ow
B
att
/p
owEr
lED
The
l
ow
B
att
/p
owEr
indicator illuminates solid green during normal operation of the
SA-3052. When operating the SA-3052 on the optional internal rechargeable batteries, a flashing green
LED indicates that the batteries need recharging. Once the Low Batt LED has begun flashing, there is ap -
proximately ½ hour of battery life remaining.
The SA-3052 has a sense circuit that prevents operation of the instrument below critical battery cell volt-
age. This prevents total battery discharge, which shortens the cell life.
To continue operation, the SA-3052 may be operated from the AC power line. The batteries may be re-
charged by plugging the SA-3052 into a suitable source of AC power, with the front panel
p
owEr
switch
set to the
o
ff
position for a period of 9 to 10 hours. The power LED will glow red while the batteries are
charging and flash occasionally when fully charged. The minimum recharge time from the voltage-cutout
state is around 2 hours, which will then operate the instrument for around one hour. Completely recharg-
ing the batteries from a discharged state (instrument dead) requires 9 to 10 hours (2 times the discharge
time).
SPL
Momentarily pressing the
Spl
push-button switch toggles the
SPL
bargraph at the right side of the
display window on and off. Pressing and holding the
SPL
push-button activates the full-screen digital
SPL
display. Momentarily pressing the
SPL
switch again restores normal analyzer operation. The associ-
ated LED indicator indicates the status of the SPL switch. The SPL bargraph display scaling is always
4 dB/step, regardless of the setting of the dB switch. The SPL switch works regardless of the setting of
the
r
ECall
/r
ta
switch. This means that you can switch the
SPL
bargraph on and off even with a stored
display.
Features
2-1