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SA-3051/SA-3052 Operation Manual

iSplay

pEED

The display speed push-button switch is located underneath the SPL switch and to the left of the

aSt

and

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, the Med set-

ting 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 average.

It is indicated by the

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.

Emory

The SA-3051/SA-3052 can store up to six different frequency response curves (including the SPL dis-

play) in its internal non-volatile memory. These memories are stored at the highest resolution of the SA-

3051/SA-3052, so you can scale the display with the

B/S

tEp

switch during memory recall. Any com-

bination 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-3051/SA-3052 is used.

ink

oiSE

The internal pink-noise generator is an accurate, digital, laboratory-grade test source. The pink noise out-

put 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 crossover directly.

B p

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 rep-

resent 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-3051/SA-3052 for sound system equalization, start with the 4 dB/step setting and

progressively decrease the setting of the

B p

tEp

switch as the equalization process progresses. For

program monitoring, the 4dB position works well because it displays the widest dynamic range.
Memorized response curves are always stored at 1-dB-per-step-resolution, regardless of the setting of the

front panel switch. You can select whatever resolution you wish for a stored display when it is displayed

and know that it is accurate. The same holds true for displays dumped to the printer output.

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