User guide

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CHAPTER 7
Using SIM 3
7.13.4.1. Verify Polarity — Processor
1. Select the Delay Finder measurement. Select the Processor view. Select Settings >
Delay Finder Settings and set the Averages to Accumulate. Set the Generator to Noise.
2. Acquire the polarity value, by selecting Data > Store DataGroup. Store and name your
measurement.
NOTE: A positive-going impulse indicates a non-inverting path between the
two measurement points.
7.13.4.2. Verify Polarity — Speaker
1. Select the Delay Finder measurement. Select the Room view. Select Settings > Delay
Finder Settings and set the Averages to Accumulate. Set the Generator to Noise.
TIP: Make sure that the measurement microphone is close enough and on axis
with the loudspeaker being measured so that you are assured to be measuring
that particular loudspeaker.
2. Acquire the polarity value, by selecting Store DataGroup from the Data menu. Store and
name your measurement.
7.13.5. Verify Coverage
The Verify Coverage measurement is used to determine the coverage angles of the
loudspeaker or group of loudspeakers in a particular selected branch. This is the step-by-
step procedure as presented in SIM 3.
NOTE: The purpose of Verify Coverage is to find where the coverage pattern
falls off (the nominal value is the 6-dB down point), especially at mid and
high frequencies, as an aid in properly aiming the loudspeakers and in using multiple
loudspeakers to evenly cover a larger audience area.
Select Method — Single Microphone (the first measurement will be taken and then the mic
will be moved). Dual Microphone (placing both mics and using the SIM 3 switcher capability
to select each one).