MR-PRO controls vibration shakers
The
Minirator MR-PRO generates low frequency sine signals 1 – 10 Hz. These
test signals are typically utilized for driving a vibration source or
for calibration of vibration transducers. The 1 – 10 Hz wave files are
a free download for all Minirator customers.
 Vibration
transducers and –shakers operate typically in the frequency range from
1 Hz to 20 kHz. With the recently introduced new set of wave files,
including 1 – 10 Hz sine signals, the Minirator MR-PRO perfectly suits
vibration- and seismic applications, such as calibrating vibration
transducers and driving shakers.
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AL1 in Action on Amsterdam Airport
A
new fire- and evacuation system has been installed at Amsterdam Airport
in Netherlands. After completed installation, the new system with a
total of 15.000 test points required detailed pre-testing for official
approval. The NTI Acoustilyzer proofed to be right choice for fast and
accurate speech intelligibility measurements.
The
system has been provided by ATH techniek b.v., containing Dynacord
Processors and about 10.000 speakers. The company "Team Projects"
received the contract to test the speech intelligibility of the new
fire- and evacuation system trough out the terminals.
Peter van de Geer, project manager of Team Projects reports: "The
airport authorities allowed us to test the 10.000 speakers and
slow-hoop horns only during nights, as the terminals had to be empty,
thus the time schedule was very tight. The test results had to be
provided within 4 weeks only. Imagine we had to do about 5.000
measurements, we measured the whole airport area, including baggage
halls, corridors, terminals, parkings etc., with a measurement grid of
about 5 by 5 meters. But our experience with the fast STI-PA
measurement of the NTI Acoustilyzer gave us confidence to successfully
complete the project."
The
STI-PA measurement had to be carried out very quickly. The TeamProjects
Audio engineers used the NTI STI-PA CD, fed the test signal into the
system, measured the speech intelligibility at the various 15.000 test
points, and recorded the test results directly into the internal
Acoustilyzer memory on-site. A round-a-clock project: Measurements in
the night and analyzing / reporting in daytime. Following the local
regulations the minimum speech intelligibility is 0.5 STI, but various
test positions didn't met this limit, thus Team Projects recommended
further acoustical improvements increasing the intelligibility above
the 0.5 mark. |
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Team Projects has tested 10.000 speakers at 15.000 testpoints using the Acoustilyzer AL1
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After completed successful testing the new fire- and evacuation system was ready for the airport authorities.
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Minirator – More than just a signal generator
Terry
Nelson tested the Minirator MR-PRO for the Line Up magazine, the
Journal of the Institute of Broadcast Sound. He used the MR-PRO to
install sound systems in meeting rooms and inspect and repair his audio
equipments.
 “I tested with the Minirator MR-PRO three microphone inputs on my DJ mixer”, reports Terry Nelson in his review, “To
my great surprise I found them unbalanced! The MR-PRO measurement
functions are excellent for fault testing, such as short circuits,
defective cabling and balanced system verifications”.
Terry Nelson summarizes the review with: “The
NTI Minirator MR-PRO proved itself extremely useful in the field, and a
detailed investigation has shown that it has a lot of possibilities. On
that basis, I would recommend it as a “must have” item for your test
kit. Used in conjunction with the other NTI instruments, the scope for
measurement widens considerably, but as a stand-alone unit it remains a
vital ingredient. Highly recommended”.
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