G.R.A.S. 12HM Manuale utente

Instruction Manual

Power Module Type 12HM

Skovlytoften 33, 2840 Holte, Denmark

www.gras.dk [email protected]

SOUND & VIBRATION

G R A S

...

Revision 05 12 2012

Power Module

Type 12HM

G.R.A.S. Sound & Vibration

CONTENTS

1. Introduction and Description ......................................3

1.1 Polarization Voltage ................................................3

1.2 PreamplierVoltageSupplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Input/Output ......................................................3

1.4 PowerSupply .....................................................4

2. External Features ................................................5

2.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Rear Panel .......................................................6

3. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 PowerSupply .....................................................8

3.2 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Based on Channel Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Pistonphone .............................................................8

3.3 Measurements ....................................................8

4. Service and Repair ..............................................10

5. Specications ..................................................11

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 4

Fig. 1.1 Power Module Type 12HM

1. Introduction and Description

TheG.R.A.S.PowerModuleType12HM(Fig.1.1)isa10-channelpowersupplyforthefollow-

ingtypesofG.R.A.S.preampliersandmicrophoneswhenmakinglow-noisemeasurements:

• 1-inchPreamplierType26HFwith1-inchMicrophoneType40EH

• ½-inchPreamplierType26HHwith½-inchMicrophoneType40AH

Withthese,sound-powermeasurentsoflow-noiseproducts,suchasdiskdrives,canbemade

underanechoicand/orsemi-anechoicconditionsaccordingtoIEC3745:1977.

TheType12HMprovides:

• polarizationvoltages(200V)for10condensermicrophones

• voltagesupplies(±15V)forpowering10microphonepreampliers

• individualresponsesetting,PressureorFreeeld,foreachchannel

• individualgainadjustmentof±3dBforeachchannel

1.1 Polarization Voltage

Polarizationvoltagesof200Varesuppliedviathe7-pinLEMOEGA3071Bsocketsonthefront

panel.

1.2 PreamplierVoltageSupplies

Preampliervoltagesuppliesof±15Varesuppliedviathe7-pinLEMOEGA3071Bsocketson

the front panel.

1.3 Input/Output

EachchanneloftheType12HMhasa7-pinLEMOEGA3071BinputsocketfortheG.R.A.S.

microphonepreampliersmentionedabove,viz.Types26HF,and26HH.Fig.2.3showsthe

wiringdiagramofthisinputsocket.

TheoutputofeachchannelisavailableviaastandardBNCsocketfordirectusewithanalyzers,

voltmeters,oscilloscopesetc.

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 5

1.4 Power Supply

TheType12HMcanrunfromanominalmains/linesupplyofeither:

• 115VACor

• 230VAC

Avoltagetapisprovidedontherearpanelforselectingoneortheother.Ondelivery,itissetto

230 V AC.

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 6

2. External Features

2.1 Front Panel

2.1.1 Power Switch

See Fig. 2.1.

• Power OnLED(green)

ThegreenLEDlightsupwhenevertheunitisswitchedonviatheOn/Off(I/0)toggle

switch.

• Mains/linetoggleswitchOn/Off(I/0)

Formains/lineACsupply.Power OnLEDilluminatedwhenpowerisswitchedon.

Fig. 2.1 On/Off (I/0)switch on front panel

2.1.2 Channel Details

Front-paneldetailsforeachchannelareasshowninFig.2.2.

• Pressure or Freeeldswitch

Forselectingafrequencyresponsecorrespondingtoeitherpressure-microphoneopera-

tionorfree-eldmicrophoneoperation:

Pressure-toselecttheoutputofthecompensatinglter(inthepreamplier)whichgives

thesystemalinearpressure-frequencyresponse.

Free Field-toselecttheoutputofthecompensatinglter(inthepreamplier)whichgives

thesystemalinearfree-eldfrequencyresponseat0°incidence.

• OverloadwarningLED

Lightsinstantaneouslyandonlywhilethereisanoverload;synchronisedwiththeoneon

thepreamplier(Type26HForType26HH).

• Level Adjustmentswitchandpotentiometer

On-enablesthelevel-adjustmentpotentiometer;useasmallscrewdriveronthepotenti-

ometertoadjustthegaininsignallevel(±3dB)

Off-disablesthelevel-adjustmentpotentiometer.

Ineithercase,thesignallevelwillalreadyhavebeenraisedby20dBbythepreamplierto

yieldanominalsystemsensitivityof:

• 1.1V/Pawiththe1-inchpreamplierandmicrophone,or

• 0.9V/Pawiththe½-inchpreamplierandmicrophone

• PreamplierInput

7-pinLEMOEGA3071Binputsocketformicrophonepreamplier.Wiringdiagramshown

in Fig. 2.3

• Ouput

BNCsocketfortheoutputsignaleitherviasignalconditioningordirectlyfromthemicro-

phonepreamplier.

Mains/lineOn/Off

toggleswitch

Power on

LED(green)

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 7

2.2 Rear Panel

Therearpanelhasthefollowingfeatures(seeFig.2.4)

• AC Mains 50 - 60 Hz, 35 VA

Inputsocketformains/lineACpowersupply.Centrepinisearth/ground.

• Fuse

Pull-outfuseboxfortwofuses,oneactive(innermost)andonespare.Fuserating:

315mA(Slow)for115VACmains/linesupply,or

160mA(Slow)for230VACmains/linesupply

• Mains Voltage Selector

VoltagetapformatchingtheType12HMtotheavailableACpowersupplyvoltage,select.

• 230foranACmains/linepowersupplyofnominally230VAC,or

• 115foranACmains/linepowersupplyofnominally115VAC

Fig. 2.3 7-pin LEMO EGA 307 1B input socket (exter-

nal view)

Fig. 2.2 Front-panel details for each channel of the Power Module Type 12HM

Leveladjustmentpotenti-

ometer;enabledwhenlevel

adjustmentisswitchedOn

Preamplierinput

OverloadLED(instantaneous)

Responsesettingswitch

Leveladjustmentswitch

Output

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 8

Fig. 2.4 Rear panel of the Power Module Type 12HM

ACMains/lineinputsocket

50-60Hz35VA Mains Voltage

Selector:

230 V AC or

115 V AC

Pull-outfusebox,for2fuses,

1active(innermost);1spare

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 9

3. Operation

Note:thischapterassumesthattheType12HMisbeingusedwitheitherofthefollowing

G.R.A.S.preampliers(nootherscanbeused):

• 1-inchPreamplierType26HFwith1-inchMicrophoneType40EH

• ½-inchPreamplierType26HHwith½-inchMicrophoneType40AH

3.1 Power Supply

BeforeconnectingtheType12HMtoanACmains/linesupplyandswithcingiton,makesure

the Mains Voltage Selectorontherearpanel(seeFig.2.4)matchesthelocalACvoltage

supply.Select:

• 230foranACmains/linepowersupplyofnominally230VAC,or

• 115foranACmains/linepowersupplyofnominally115VAC

Checkalsothatthecorrectfuseisinplaceandnotblown(seeFig.2.4).

3.2 Calibration

3.2.1 Based on Channel Sensitivity

SincethemicrophonesignalisampliedinthePreamplierby20dB,thenominalsensitivityat

theoutputofthechannelinquestioncorrespondsto:

• 1.1V/Pawiththe1-inchpreamplierandmicrophone,or

• 0.9V/Pawiththe½-inchpreamplierandmicrophone

Correspondingly(ifLevel AdjustisswithchedOff-seeFig.2.2),whenthemeasuredRMS

outputvoltagefromthechannelis1.1Vor0.9V,themicrophoneinquestionisbeingsubjected

to94dBre.20μPa.

Basedonthisinformation,proceedasfollows:

1. Connectthechanneloutputtotheanalyzertobeusedandswitchbothunitson.

2. Adjusttheanalyzertoindicate94dBre.20μPaforanRMSinputofSvolts;whereSis the

sensitivity(1.1V/Paor0.9V/Pa,seeabove)ofthechannelinquestion.

3.2.2 Pistonphone

AG.R.A.S.PistonphoneType42AAttedwithaG.R.A.S.CouplerRA0090canbeusedtopro-

duce94dBre.20μPaonamicrophone.

Note:aPistonphonettedwithanormal1-inchcoupler(RA0023)cannotbeusedbecausethis

willoverloadthechannelwithalevelof114dBre.20μPa.

Proceedasfollows:

1. Connectthechanneloutputtotheanalyzertobeusedandswitchbothunitson.

2. UnscrewandremovethenormalcouplerofthePistonphone.

3. ScrewtheCouplerRA0090tothePistonphone,seeFig.3.1.

4. InsertthemicrophoneofthechannelinquestionintheCouplerasshowninFig.3.2and

switchthePistonphoneon.Note:fora½-inchmicrophone,usetheadapterGR0619sup-

pliedwiththeCouplerRA0090.

5. Adjusttheanalyzertoindicate94dBre.20μPa.

3.3 Measurements

1. Connectthepreamplier(withmicrophone)totheLEMOEGAinputofthechannelinques-

tion.

2. Connecttheoutputfromthechanneltoananalyzer

G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 10

3. Switchonbothunits

4. Calibratethesetupviaoneofthemethodsdescribedinsection3.2.

5. SelectwhichmicrophoneoperationtouseviatheswitchonthefrontpanelmarkedPres-

sure/Free Field(seeFig.2.2).

Atthispointyoucanmakeyourmeasurementsbutkeepaneyeontherelevantoverloadwarn-

ingLEDs(oneonthefrontpanelforeachchannelandoneonthepreamplier)toavoidover-

loadingthesystemandinvalidatingthemeasurements.

Fig. 3.1 Pistonphone without its normal coupler and ready to accept the

Coupler RA0090

Fig. 3.2  Pistonphone tted with Coupler RA0090 and the microphone 

inserted into the Coupler

Indice

Altri manuali G.R.A.S. Unità di controllo

G.R.A.S.

G.R.A.S. 12AR Manuale utente

Manuali Unità di controllo popolari di altre marche

Festo

Festo Compact Performance CP-FB6-E Manuale elenco delle parti

Elo TouchSystems

Elo TouchSystems DMS-SA19P-EXTME Manuale utente

JS Automation

JS Automation MPC3034A Manuale utente

JAUDT

JAUDT SW GII 6406 Series Guida rapida

Spektrum

Spektrum Air Module System Manuale utente

BOC Edwards

BOC Edwards Q Series Manuale utente

KHADAS

KHADAS BT Magic Manuale utente

Etherma

Etherma eNEXHO-IL Manuale utente

PMFoundations

PMFoundations Attenuverter Manuale utente

GEA

GEA VARIVENT Manuale utente

Walther Systemtechnik

Walther Systemtechnik VMS-05 Manuale utente

Altronix

Altronix LINQ8PD Istruzioni per il montaggio

Eaton

Eaton Powerware Series Manuale utente

WAGO

WAGO 750-407/040-000 Manuale utente

Sony

Sony CCU-590 Manuale utente

Graco

Graco 25D614 Manuale utente

Task Force Tips

Task Force Tips YE-RF-900 Manuale di programmazione

Shini

Shini SPV-U Series Manuale utente