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REF - REFERENCE LEVEL
Sets the LCD display reference level for use with the
ANALYZE mode.
RES – RESOLUTION
The D1500 RTA LED meter's can be software set to
display different ranges of level using the RESOLU-
TION parameter. For many applications, you'll want
to set the LED meters to operate with a resolution of
6dB, where each LED in the meter represents 6dB of
change. For a fine look, you can set the resolution to .5
dB, where each LED represents .5 dB of change. To set
the resolution, press the RES switch and use the Data
Wheel to select 0.5dB, 1dB, 2dB, 3dB or 6dB per LED.
HOLD
The D1500 incorporates a HOLD feature that lets you
monitor the maximum level of each band. The HOLD
parameter has three modes OFF, ON, and AUTO. When
set to HOLD is set to ON, the LED representing the
highest level of each frequency band will stay lit so
that frequency band's maximum level can be easily
recognized. When HOLD is set to AUTO, the maximum
level is frozen on the display, then it will fall down
again very slowly. No peak LED is displayed when
HOLD is set to OFF
FREQ – FREQUENCY
The D1500 is easy to use, and you can make precise
audio measurements as you get deeper into the pow-
er of the unit. You can actually change the frequency
range of the LED display allowing you to microscope
down on certain frequencies. For example, you can
set the FREQUENCY to be read at the standard 20 Hz
to 20 kHz, or (for example) you can set the entire LED
display to read from 1k to 1.6k dividing that range by
31 smaller bands.
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9
Operating the D1500
Using the ANALYZE Mode
Before you get started using the ANALYZE mode, press and
hold the ANALYZE switch for about two seconds and take
notice of the parameters that can be adjusted while using the
ANALYZE mode.You'll notice that the GAIN, RES, and HOLD
are illuminated indicating that these parameters can be
edited.
The ANALYZE mode lets you take a snap shot of the
frequency response curve, at a particular instant in
time, and freeze it into memory for a closer look.
When using the ANALYZE mode, you can use the
parameters GAIN, RESOLUTION and HOLD. These
parameters will be set in the same values as they-
were set for RTA mode, however if you need to adjust
them you can do so in ANALYZE mode by simply
pressing the associated parameter switch.
• Select an input source from either the MIC or line
inputs and play some program material through
your sound system.
• With the microphone or line connected, press the
RTA mode switch to get a reading.
• Now, at the place in the program material where
you want to make your measurement, press
ANALYZE to freeze the response curve.
• At this point, you can use the Data Wheel to scroll
through the various frequency bands and get an
exact reading on their levels, relative to the level
set in the RTA mode.
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