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Operating the D1500
Adjusting the RTA parameters
Before you get started using the RTA function, press and
hold the RTA switch for about two seconds and take no-
tice of the parameters that can be adjusted while using
the RTA.You'll notice that the SOURCE, GAIN, DETECT,
INTEG,WEIGHT, REF, RES, HOLD and FREQ are all illumi-
nated indicating that the parameters can be edited.
SOURCE
The D1500 can analyze an audio signal from its Left
and Right inputs or from the Mic input when con-
nected to a measurement microphone. The SOURCE
switch allows you to select one of the three input
configurations; LEFT, RIGHT, or LEFT + RIGHT.
If you want to measure a mono signal from either the
LEFT or RIGHT inputs select LEFT or RIGHT respec-
tively.
If you want to measure the response curve from a
stereo source select LEFT + RIGHT.
For measuring room response using a test micro-
phone select MIC from the Global menu as described
in section "Selecting the input" on the previous page.
"Selecting the input" on the previous page.
"Selecting the input"
Note: The D1500 can also analyze a digital audio sig-
nal when fitted with the optional DIO1 digital input
and output interface card.
GAIN
The GAIN control is used to set the reference point of
the RTA display. You can slide the scale of the RTA dis-
play using the GAIN. Once you confirm that you have
set the correct operating level for your line or mic
input (using the GLOBAL set up and the main input
meter), you can adjust the GAIN so the RTA response
is in a good range with most of the readings averag-
ing halfway up the display. The D1500's GAIN
control offers a wide range of control covering from
0 dB to 120 dB. Press the GAIN switch and use the
Data Wheel to adjust the level either up or down .
DETECT
The D1500 RTA can respond using both PEAK and
RMS detection. The detection algorithm determines
the speed, or ballistics at which the RTA reacts to
the incoming signal. When set to PEAK the RTA will
respond quickly to the absolute highest level. When
RMS is selected, the RTA uses root mean square av-
eraging which will cause the meters to react slower.
To set the detection mode, press the DETECT switch
and use the Data Wheel to select either PEAK or
RMS.
INTEG – INTEGRATION
The speed at which the D1500 LED meters respond
can be adjusted using the INTEGRATION parameter.
The INTEGRATION time can be set in a range from
15 milliseconds, all the way to 20 seconds.
WEIGHT
The D1500 lets you apply audio industry standard
equalization curve filters to the input of the RTA.
You can select A, B, C or D filter curves or NONE if
you choose. To select the input filter curve, press the
WEIGHT switch and use the DATA Wheel to select
the desired filter curve.
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