9/29/09 AUD (Optional) 13-7
The check menu (accessed by pressing the check key c
while this display is active) provides the setting choices
shown in the next two screen shots.
SLM+RTA Live Check Menu The SLM+RTA Live check menu items are:
• Graph -Allows control over the resolution and scaling of
the spectrum graph.
• Gain -Changes the gain setting of the instrument.
Generally use 0dB gain for levels at 70dB SPL and
above, and 30dB gain for levels less than 70dB SPL. The
Auto Gain Control (AGC) function of the linearity
displays step between 0 and 30 dB gain, if the gain
setting is something other than 0 or 30 the AGC function
is inhibited.
• RTA Detector -This setting controls the rate of change
of RTA filter output, Slow or Fast, which provides 1
second or 1/8th second exponential time constants,
respectively.
• Bandwidth -The fractional octave bandwidth of 1/1 or 1/
3 are selected with this setting.
• RTA Weighting -This setting selects either A, C or Flat
frequency weighting as a filter prior to fractional octave
filtering.
To measure the level in dB (re. 20 micro Pascals), place the
cursor on the frequency of interest and read the frequency
and value on the left hand side of the screen. Levels must be
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