minstruments workshop 13. march 08, frankfurt the new generation of audio signal generators
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Minstruments Workshop13. March 08, Frankfurt
The New Generation OfAudio Signal Generators
PLS 2008 Minstruments Workshop 2
New Signal Generators
Minirator MR-PRO Digirator DR2Minirator MR2
Available now!
PLS 2008 Minstruments Workshop 3
Index
1st Part: Analog Audio Minirator MR-PRO New Firmware and Accessories Distributed Speaker Systems, 100V Applications MR-PRO and AL1
2nd Part: Digital Audio Introduction Digirator DR2 Dolby Surround System Setup
PLS 2008 Minstruments Workshop 4
Analog Audio
PLS 2008 Minstruments Workshop 5
Introducing Minirator MR-PRO
Generator Functions:
Sine, White / Pink Noise, Sweep,
Chirp, Delay, Polarity
WAVE File Playback
- STI-PA, voice messages
- Sounds of music instruments
Additional new wave files
- Band-limited 1/3 octave pink noise
- Square waves
PLS 2008 Minstruments Workshop 6
New MR-PRO Firmware V2.01
New Generator Features:
Fine Volt adjustments (e.g. "100 mV")
Configuration files may be renamed
when connected as a mass storage
device to a PC
PLS 2008 Minstruments Workshop 7
New Minirator Accessory
Minirator -40dB Adapter
Attenuator for high quality microphone level
signals (increases signal-noise ratio)
Applicable for MR2 and MR-PRO.
The MR-PRO specifications are
- Output level range: -80 .. +18 dBu
- Residual distortion (internal noise): -96 dBu
-> minimum S/N ratio @ -80dBu = 16dB
Minirator
-40dB Adapter
PLS 2008 Minstruments Workshop 8
Application for -40dB Adapter
Output level = -60 dBu
S/N ratio = 26 dBu
Adjusted level = -20 dBu
Actual output level after
-40dB Adapter= -60 dBu
S/N ratio = 66 dBu
+ =
PLS 2008 Minstruments Workshop 9
MR-PRO Measurements
Measurement Functions:
Phantom Power
Balance Indication
New: Detailed XLR Cable Tester
New: Impedance + Phase
New: Apparent Power + Phase
PLS 2008 Minstruments Workshop 10
MR-PRO Measurements MR-PRO measures Phantom Power Phantom Power should be 48V +/-
10%.
Application:Checking inputs of mixing console.
Channel 1: Phantom Power
is 42.6V instead of 48VMixing console
PLS 2008 Minstruments Workshop 11
MR-PRO Measurements
Minirator MR-PRO measures Balance Impedance
Application:Checking inputs of mixing
console.
Channel 1: ok Channel 2: defectiveMixing console with defective channel 2
PLS 2008 Minstruments Workshop 12
New MR-PRO Firmware V2.01
New Features:
Detailed cable test fault information
Impedance measurement screen with
- Impedance + Phase
- Apparent Power + Phase
Faster impedance measurement
PLS 2008 Minstruments Workshop 13
Detailed Cable Test
Works perfectly on open ended cables
XLR Out XLR In
Cable2
1
3
MR
-PR
O
R3 = 2k
R2 = 1k
MR-PRO Remote Plug
Detailed XLR-cable test fault information
PLS 2008 Minstruments Workshop 14
Impedance Measurements
Minirator MR-PRO V2.01 measures
Impedance Phase
XLR Out
2
1
3
MR-PRO C = 56 nF
R = 10 kohm
Applications Frequency crossovers Electronic circuits
PLS 2008 Minstruments Workshop 15
Impedance Measurements Tailored for testing 100V systems Measurement frequency selectable 30 Hz … 10 kHz Replaces common impedance meters
e.g. TOA ZM104 (320$) or Goldline ZM01, RCS ZS-2, Sennheiser
PLS 2008 Minstruments Workshop 16
Distributed Systems, 100V
100 Volt Amplifier
max. 100 Volt
Distributed speaker system
2 W 2 W 2 W
PLS 2008 Minstruments Workshop 17
Distributed Systems, 100V Advantage: 100V technology reduces line loses at long distances from
amplifier to speaker. The SPL of each single speaker can be adjusted
at the speaker. The amplifier output level is 100V at maximum load.
70V systems:
- Power consumption of speaker is only 50% compared to 100V
- SPL reduced by 3dB
50V systems:
- Power consumption of speaker is only 25% of 100V
- SPL reduced by 6dB
PLS 2008 Minstruments Workshop 18
Impedance Measurements
MR-PRO Firmware V2.01 offers Impedance measurement with
- Apparent Power + Phase
MR-PRO measurement unit VA
Watt [W]
VoltAmpere [V
A]
PLS 2008 Minstruments Workshop 19
100V Loudspeaker Systems
Always disconnect the 100V
amplifier for impedance / power
measurement with MR-PRO!
100 Volt Amplifier
PLS 2008 Minstruments Workshop 20
100V Loudspeaker Systems
100V Speaker System
Power rating: 2 W, typically @ 1kHz
Transformer impedance = 5 kohm
MR-PRO measures
Accurate Impedance = 5.2 kohm
Phase = 13° inductive
Power ~ 2 VA
(calculated by P = U2/R = 100V2/5200)
PLS 2008 Minstruments Workshop 21
100V Loudspeaker Systems
100V Speaker System
Power rating: 2 W
Transformer impedance = 5 kohm
Power ~ 6 VA
max. 100 Volt
2 W 2 W 2 W
PLS 2008 Minstruments Workshop 22
100V Loudspeaker Systems
Sample problems onsite:
Speakers not connected
Speakers wrongly connected or other
electric devices connected
Connection to wrong transformer
taping, e.g. 1W instead of 2W
only 2 of 3 speakers
connected
one speaker wrongly
terminated, 1W instead of 2W
PLS 2008 Minstruments Workshop 23
100V Loudspeaker Systems
Sample problems onsite:
Short Circuits
Mains Power Supply, use accessory
“MR-PRO 70/100V Protection”
Other external voltages, such as fire
alarm devices connected
Bad connection cables
short circuit of
speaker terminals
PLS 2008 Minstruments Workshop 24
100V Loudspeaker Systems
Sample problems onsite:
Vibration and environment noise in the
speaker area effects speaker impedance.
Solution:
The MR-PRO impedance measurement
includes appropriate technology for
stable readings in noisy environments.
MR-PRO features
stable impedance reading
PLS 2008 Minstruments Workshop 25
100V Loudspeaker Systems
Line 2
Line 1
wrongly connected
max. 100 Volt
PLS 2008 Minstruments Workshop 26
New MR-PRO Accessory
MR-PRO 70/100V Protection
Protects Minirator MR-PRO against
accidentally applied voltages during
impedance or power testing at distributed
70V/100V speaker systems.
PLS 2008 Minstruments Workshop 27
Application of 100V Protection
MR-PRO is specified with
max. input level = 60 VDC.
During operation of speaker
system the line level is up to 100V.
100V Protection
(adapter with fuses)
100 Volt Amplifier
max. 100 Volt
PLS 2008 Minstruments Workshop 28
Application Minirator with Acoustilyzer
High-resolution Frequency Response
PLS 2008 Minstruments Workshop 29
High-res Frequency Response High-resolution frequency
response up to 0.7Hz steps
Audio Amplifier
MR-PRO with
Chirp Signal
Acoustics measured
by Acoustilyzer AL1
FFT mode - LEQ
PLS 2008 Minstruments Workshop 30
High-res Frequency ResponseHigh-resolution frequency response up to 0.7Hz steps:
MR-PRO Chirp Signal: Set start, - stop frequency and time Acoustilyzer AL1 FFT-Mode: Set LEQ and Range and
resolution
MR-PRO
Chirp Signal on
PLS 2008 Minstruments Workshop 31
Application Minirator with Acoustilyzer
Reverberation Time RT60 with 1/3rd octave resolution
PLS 2008 Minstruments Workshop 32
RT60 in 1/3 Octave Resolution The Acoustilyzer measures basically reverberation time
RT60 in 8 octave bands in the range from 63 Hz – 8 kHz.
RT60 Time
AL1 measures RT60 in
octave resolutionReverberation time RT60
PLS 2008 Minstruments Workshop 33
RT60 in 1/3 Octave Resolution New test signals extend the RT60 measurement to 1/3
octave resolution.
PLS 2008 Minstruments Workshop 34
RT60 in 1/3 Octave ResolutionMR-PRO offers additional test signals for extended 1/3 octave
resolution.
How to do: Load 1/3 octave pink noise test signals on MR-PRO
Test1_1/3_low: pink noise spectra of the 1/3 octave bands100Hz, 200Hz, 400Hz, 800Hz, 1.6kHz, 3.15kHz
Test2_1/3_mid: pink noise spectra of the 1/3 octave bands125Hz, 250Hz, 500Hz, 1.0kHz, 2.0kHz, 4.0kHz
Test3_1/3_hi: pink noise spectra of the 1/3 octave bands:160Hz, 315Hz, 630Hz, 1.25kHz, 2.5kHz, 5.0kHz
PLS 2008 Minstruments Workshop 35
RT60 in 1/3 Octave Resolution Reverberation Time RT60
with 1/3rd octave resolution
MR-PRO with
1/3 octave Pink Noise
Signal
Acoustilyzer AL1
measures RT60
Audio Amplifier
PLS 2008 Minstruments Workshop 36
RT60 in 1/3 Octave Resolution
Carry out individual RT60 measurements and load test results into automated Excel-sheet.0.000
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Band ( Hz)
RT60, 1/3 low RT60, 1/3 mid RT60, 1/3 hi
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RT60, 1/3 low RT60, 1/3 mid RT60, 1/3 hi
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Band ( Hz)
RT60, 1/3 low RT60, 1/3 mid RT60, 1/3 hi
Test 1:
Test 2:
Test 3:
PLS 2008 Minstruments Workshop 37
Summary
PLS 2008 Minstruments Workshop 38
Acoustic Set Pro
Minirator MR-PRO Acoustilyzer AL1 MiniSPL Cable Test Plug Mains Power Adapter MR-
PRO Adapter -20dB Minstruments Case
PLS 2008 Minstruments Workshop 40
Digital Audio Set
Digirator DR2 Digilyzer DL1 with MiniLINK Mains Power Adapter DR2 Mains Power Adapter DL1 DR2 Transformers AES3id DL1 Transformers AES3id Minstruments Case
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