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0611 RM500SL User’s Guide Version 2.8 Page 49
9.7 Manual control procedure
FastFacts 9.7: Manual control procedure
9.8 Sound level meter using manual control
FastFacts 9.8: Sound level meter using manual control
Manual control displays the reference microphone SPL, the coupler microphone
SPL, their difference in dB (gain) and coupler microphone signal distortion at any
selected 1/12
th
octave frequency and at a selected input level from 40 to 90 dB (in
5 dB steps) and at 0 dB (off).
1) Press <Tests>, then highlight and
<PICK> [Manual control].
2) Highlight and <PICK> the Level
window, then highlight and <PICK> the
desired stimulus level from the drop-
down list.
3) Highlight and <PICK> the Frequency
window, then highlight and <PICK> the
desired frequency from the drop-down
list. (Distortion measurement data is
available only from 200-4000 Hz.)
4) Highlight and <PICK> [Start test] to
start the test. [Start test] changes to
[Stop Test]. To stop the measurement,
highlight and <PICK> [Stop test]. You
may change Level and Frequency
without stopping the test.
When set for a stimulus level of 0 dB (off), the Manual control mode allows the
RM500SL to be used as a sound level meter. Sound at the HIT reference
microphone and the coupler microphone may be analyzed by 1/12
th
octave, A-
weighted or C-weighted filters. A and C-weighted measurements are limited to
frequencies above 100 Hz and the averaging time and update rate are 384 ms.
1) Press <Tests>, then highlight and <PICK> [Manual control].
2) Highlight and <PICK> the Level window, then highlight and <PICK> 0 dB
stimulus level from the drop-down list.
3) Highlight and <PICK> the Filter window, then highlight and <PICK> 1/12
th
octave, A-weighted, or C-weighted from the drop-down list.
4) For 1/12
th
octave filter, highlight and <PICK> the Frequency window, then
highlight and <PICK> the desired frequency from the drop-down list.
5) Highlight and <PICK> [Start test] to start the test. [Start test] changes to [Stop
Test]. To stop the measurement, highlight and <PICK> [Stop test]. You may
change Level and Frequency without stopping the test.
NOTE: A microphone extension cable (VA-130) is available from Audioscan.
Standard audio extension cables should not be used. They will substantially
increase noise levels.