Audix MPAB3 User Manual Download Page 3

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page 3 of 15

21016 SMU1-MPAB3 V1.3.doc

Models Covered

This user manual covers the following equipment

•

SMU1 (570.005.005) Single Button Paging Microphone

•

MPAB3 (570.005.007) Microphone Pre Amplifier

Technical Support

In the unlikely event of you having problems with your SMU 1 please contact

our Technical Support.

Audix Systems

Station Road

Wenden

Saffron Walden

CB11 4LG

Tel +44 (0)1799 540888

Fax +44 (0)1799 541618

Website

www.tycosafetyproducts-europe.com

www.audixsystems.co.uk

Summary of Contents for MPAB3

Page 1: ...page 1 of 15 21016 SMU1 MPAB3 V1 3 doc Single Button Microphone Unit SMU1 Incorporating Microphone Pre Amplifier MPAB3 User Manual V1 3 ...

Page 2: ... manual contains information that is correct to the best of Audix Systems knowledge It is intended to be a guide and should be used as such It should not be considered as a sole source of technical instruction replacing good technical judgement since all possible situations cannot be anticipated If there are any doubts as to exact installation configuration and or use call Audix Systems at 44 0 17...

Page 3: ...ing Microphone MPAB3 570 005 007 Microphone Pre Amplifier Technical Support In the unlikely event of you having problems with your SMU 1 please contact our Technical Support Audix Systems Station Road Wenden Saffron Walden CB11 4LG Tel 44 0 1799 540888 Fax 44 0 1799 541618 Website www tycosafetyproducts europe com www audixsystems co uk ...

Page 4: ...ting instructions 7 MPAB3 microphone preamplifier 8 SMU1 Specification 9 MPAB3 Specifications 9 Installation Instructions 10 Wiring 10 Fixed Installation Cable types 10 Setting Up 11 SMU1 Connection DetailsMPAB3 Connector pin outs and Jumper settings 11 MPAB3 Connector pin outs and Jumper settings 12 Connection Deatils 13 Safety Considerations 14 D718 MPAB3 Pre Amplifier Board 15 ...

Page 5: ...mpressor effectively operates over the top of the AGC to reduce the dynamic range of the gain adjusted signal The reason for this approach rather than just having a simple compressor is to reduce the amount of crackle and distortion of the signal to improve overall intelligibility of the speech signal The compressor operates normally with an attack time of around 10ms and a release time of 200ms w...

Page 6: ... of the circuitry in the system However to avoid audible signal pick up from the microphone in its non active state additional gain reduction is applied in this state which is switched out when the microphone is required A digitally synthesized 20kHz monitor tone for the Audix Systems FMS is injected directly at the microphone head with innovative circuitry able to detect open or short circuit fai...

Page 7: ...t the user is to press and hold the Speak button Until this point announcer has had no effect on the PA system A rapidly flashing green LED by the Speak button indicates that the pre announce chime is active and the announcer should wait until this green LED stays solidly on This is the Speak now indication Whilst holding the Speak button the announcer should then talk steadily and clearly into th...

Page 8: ...he box is fitted with glands It is the responsibility of the installer to ensure the cables are glanded correctly MIC MPAB RACK Terminations Dimensions of line amplifier boxes are approximately 200mm X 130mm X 50mm The unit is connected to the PA system via a four pair cable Belden 8778 equivalent Pair 1 The unit is powered from a nominal 24V D C supply Pair 2 PTT control Out Pair 3 Audio output f...

Page 9: ...s MPAB3 Specifications Power supply voltage range 15 30V DC Supply current typical 55mA 24V Audio output nominal 0dBu Audio output max 10dBu Output impedance 50 ohms Load impedance 600ohms Distortion T H D 0 05 Signal to Noise ratio Pre announcement chimes 2 or 3 tone Microphone gain trim range Preset Surveillance tone Frequency 20kHz Surveillance tone Level Adjustable Surveillance tone stability ...

Page 10: ...types depending on the environment and the length of the cable run In any case the cable should be individually screened pairs with an over all screen which must be earthed Fixed Installation Cable types Care should be taken when installing microphone cabling with respect to other power cables and systems likely to cause interference e g Mains cabling Motors etc In its normal operational mode the ...

Page 11: ...tem to adjust the volume of the microphone Do not adjust the mic pre set gain control which has been factory set to match the characteristics of the microphone and will not normally be adjusted on site The chime switch will be set to select the required chime It is also used to adjust the chime volume after the mic volume has set on the PA system To turn the chime off completely select Position 0 ...

Page 12: ...on Active Low Fit J5 J3 Fit Ptt Operation Active High Omit J5 Omit Normal Operation J4 Fit Permanently Enable Pre Amplifier Omit Ptt Operation Active High Fit J3 J5 Fit Ptt Operation Active Low Omit J3 Omit Power Off J6 Fit Power On Omit A1 A1 J7 Fit A1 SCREEN MPAB3 Trim Pot Settings VR1 Distortion Trim Do Not Adjust VR2 Set 20kHz Level VR3 Set Chime Level VR4 Set Threshold for Limiter VR5 Microph...

Page 13: ...page 13 of 15 21016 SMU1 MPAB3 V1 3 doc Connection Details ...

Page 14: ... system and the SMU1 Do not disconnect the cable from the product whilst the Voice Alarm system is powered Do not operate in wet or damp conditions or expose to dripping or splashing Do not operate in an Explosive Atmosphere This product may be incorporated into a Monitored Voice Alarm system If so to tamper with any of the setting of the SMU1 unit may cause a Fault Condition warning on the Voice ...

Page 15: ...page 15 of 15 21016 SMU1 MPAB3 V1 3 doc D718 MPAB3 Pre Amplifier Board ...

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