AudioControl SA-3052A, Operation Manual

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SA-3052A Owner’s Manual
2-2
®
Chapter 2 - SA-3055 Front and Rear Panel Features
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 associated LED indicator indicates the status of the
SPL switch. The SPL bargraph display scaling is always 4 dB/step, regardless of the set-
ting 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.
D
ispLay
s
pEED
The display speed push-button switch is located underneath the SPL switch and to the
left of the f
ast
, M
ED
and s
Low
LEDs.
The lighted LEDs to the right of the switch indicate the response time of the display.
Press the button to change the decay time of the display. The Fast setting is optimized for
looking at transients in conjunction with peak hold, the Med setting is useful for program
monitoring, and the Slow setting averages 20 samples over a ½ second period. This works
well for measurements using pink noise. A fourth display speed is a 20 second time aver-
age. It is indicated by the s
Low
LED flashing. During the first 20 seconds as the average
is accumulating, the
Slow
LED will flash 2 times per second. Once the accumulator is full,
the flashing will slow down to 1 flash per second.
M
EMory
The SA-3052A can store up to six different frequency response curves (including
the SPL bar graph display) in its internal non-volatile memory. These memories are stored
at the highest resolution of the SA-3052A, so you can scale the display with the
D
B/s
tEp
switch during memory recall. Any combination of the memories can also be averaged.
Look in the Operation section of this manual for further information.
An internal back-up battery maintains the contents of the memory for periods of up
to one year, even with the AC power supply disconnected. This feature allows the unit to
“remember” a standard curve that may be recalled each time that the SA-3052A is used.
p
ink
n
oisE
The internal pink-noise generator is an accurate, digital, laboratory-grade test source.
The pink noise output is accurate throughout the measurement range to within 0.25dB.
The maximum output provided at the ¼” tip-sleeve phone jack is 1 volt into a 600
load (unbalanced, ring and sleeve grounded), or 150 mW into a 4 ohm load.
The signal level at this connector is controlled by the knob to its immediate left.
The pink noise generator has sufficient output to drive virtually any speaker or cross -
over directly.
D
B p
Er
s
tEp
This switch sets the resolution of the spectrum analyzer portion of the display. The setting
represents the value of each LED in the display. Thus, a setting of 1dB per step causes
each LED in the display to represent a 1dB change. At this setting, the overall range of the
display is 9dB. At the 4-dB-per-step setting, each LED in the display represents a change of
4dB, with a 36dB overall display range.
When using the SA-3052A for sound system equalization, start with the 4 dB/step