minstruments workshop 13. march 08, frankfurt the new generation of audio signal generators

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!


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


Analog Audio


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


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


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


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

+ =


MR-PRO Measurements

Measurement Functions:

Phantom Power

Balance Indication

New: Detailed XLR Cable Tester

New: Impedance + Phase

New: Apparent Power + Phase


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


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


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


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


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


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


Distributed Systems, 100V

100 Volt Amplifier

max. 100 Volt

Distributed speaker system

2 W 2 W 2 W


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


Impedance Measurements

MR-PRO Firmware V2.01 offers Impedance measurement with

- Apparent Power + Phase

MR-PRO measurement unit VA

Watt [W]

VoltAmpere [V

A]


100V Loudspeaker Systems

Always disconnect the 100V

amplifier for impedance / power

measurement with MR-PRO!

100 Volt Amplifier



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)



100V Speaker System

Power rating: 2 W

Transformer impedance = 5 kohm

Power ~ 6 VA

max. 100 Volt

2 W 2 W 2 W



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




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




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



Line 2

Line 1

wrongly connected

max. 100 Volt


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.


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


Application Minirator with Acoustilyzer

High-resolution Frequency Response


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


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


Application Minirator with Acoustilyzer

Reverberation Time RT60 with 1/3rd octave resolution


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


RT60 in 1/3 Octave Resolution New test signals extend the RT60 measurement to 1/3

octave resolution.


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


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


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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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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RT60, 1/3 low RT60, 1/3 mid RT60, 1/3 hi

Test 1:

Test 2:

Test 3:


Summary


Acoustic Set Pro

Minirator MR-PRO Acoustilyzer AL1 MiniSPL Cable Test Plug Mains Power Adapter MR-

PRO Adapter -20dB Minstruments Case


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

minstruments workshop 13. march 08, frankfurt the new generation of audio signal generators

Documents

w slide

accessory mrpro

applications mrpro

phase slide

db slide

mrpro specifications

mrpro c

mrpro r3