G.R.A.S. 12HM Manuel utilisateur

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

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