Procedure for measuring an electrical signal:
1. Enter the Settings menu and change the in-
put source to “Line” and measurement unit to
either “dBu”, “dBV” or “voltage,” as required.
2. You may also want to adjust the response time,
weighting, octave and peak hold properties.
3. Send a signal into the PAA3X’s XLR input
jack. The wiring should be as follows:
Pin 2 – Hot, Pin 3 – Cold, Pin 1 – Ground
4. Select the “RUN/STOP” icon to start the RTA.
5. You can read the level of any individual
frequency or all frequencies simultane-
ously. Scroll down until the RTA screen is
highlighted and hit enter. You can then scroll
through the numerous frequencies onscreen
to get a clearer picture of each frequency’s
signal properties. This information is found
on the top left-hand corner of the display.
6. Take a snapshot of the screen at any time
by hitting the snapshot button. These will be
saved to an inserted FAT-32 formatted micro
SD card.
EQ Setting
Also included within the PAA3X is an EQ setting
function. Selecting this option within the Settings
menu will allow you monitor the suggested
equalizer band settings – updated in real time.
With perfect equalizer settings, ideally the EQ
Setting function would display a at line with no
suggested frequency adjustments. This will allow
for great quality audio with little potential for feed-
back and other issues. The EQ setting function
shows a maximum of ±15dB of boost and cut.
EQ Setting Function
Reverb Time (RT60)
The RT60 function gives the decay time of any
signal. The decay time is the time that it takes
for a signal to diminish 60 dB below the original
sound. This can be done with entirely no ltering
(at weighting) or with ltering imposed (A, B or
C weighting). The RT60 calculations are made
with no frequency ltering active, meaning the
reverb time will be calculated for all frequencies,
20 Hz to 20 kHz.
Working out the average of many dierent RT60
readings from around a room allows users to get
an idea as to how much absorption or reection
of audio the room provides. Depending on your
needs, you may wish to have a high or low RT60
measurement. For example, for public speaking,
an RT60 measurement of less than 1 second is
preferable, as to have a clear, concise voice pro-
jected to the audience. With choirs or instrumental
music, an RT60 measurement of greater than 1.5
seconds may be appropriate.
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