GRAS 12AB Manuale utente

Instruction Manual

12AB 2-Channel Power Module for

GRAS Intensity Probes

LI0113 – 12 February 2008

CONTENTS

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

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

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

1.3 PowerSupplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Input/Output ......................................................4

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

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

2.2 Rear Panel .......................................................7

3. Internal Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Battery Pack ......................................................8

3.2 User-servicableSwitches ............................................8

4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 BatteriesandExternalPower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 PolarizationVoltageandPreamplierVoltage ............................9

5. Service and Repair ..............................................10

6. Specications ..................................................11

Intensity Power Module Type 12AB - Page 3

Fig. 1.1 Intensity Power Module Type 12AB

* FactorysettingsforusewithGRASSoundIntensityProbetype50AIversionB

1. Introduction and Description

TheG.R.A.S.IntensityPowerModuleType12AB(Fig.1.1)isatwo-channelpowersupplyfor

usewithversionsB,CandDoftheG.R.A.S.SoundIntensityProbeType50AI.

TheType12ABisbuiltintoasturdyanodizedaluminiumcabinetandcanbepoweredeitherby

internalstandardbatteriesoranexternalDCsupply(12V-18V),e.g.amains/lineadapter.

AblockdiagramofitsmaincomponentsisshowninFig.1.2.

1.1 Polarization Voltage

Thepolarizationvoltagecanbesettoeither0Vor200Vviaaninternalswitch(seesection3.2).

Theseare:

• 200V*—forusewithType50AI,or

• 0V—forprepolarizedmicrophones

1.2 PreamplierVoltageSupplies

Thepreampliervoltagesupplycanbesettoeither28VDCor120VDCviaaninternalswitch

(seesection3.2).Theseare:

• 120V*—formaximumdynamicrange,or

• 28V—forminimumpowerconsumption

1.3 Power Supplies

TheType12ABcanrunoninternalbatterieswithabatterylifeofapproximately10hoursusing

G.R.A.S.preampliers,orfromanexternalpowersupplyof12-18VDC,e.g.aG.R.A.S.

mains/lineadapterAB0002(Europe)/AB0003(USA).

Intensity Power Module Type 12AB - Page 4

Fig. 1.2 Block diagram of the Type 12AB

1.4 Input/Output

Theinputisa12-pinLEMOsocketonthefrontpanelwhichiswiredup(seeFig.2.3)forthe

G.R.A.S.SoundIntensityProbeType50AIversionsB,CandD.Thisinputisalsoconnectedto

the9-pinD-subconnectorinorderto:

a) Transmitthestate(pressed/notpressed)ofthetwopush-buttonsonthehandleoftheType

50AI

Whenpressed:

thebluebuttontransmitsDSR

thegreybuttontransmitsCTS

b) SignaltheresponsesviathetwoLEDsalsoonthehandleoftheType50AI

Whenlit:

theredLEDissignallingRTS

thewhiteLEDissignallingDTR

Bysuitablyprogrammingthecomputer’ssoftware,measurementsanddataacquisitioncanbe

controlledinteractivelyviathesepush-buttonsandLEDs.

ViatwostandardBNCconnectors(AandB)onthefrontpannel,theprobe’stwooutputsignals

areavailable,DC-decoupledforusewithanalyzers,voltmeters,oscilloscopesetc.

Signal input A

Signal output A

Signal input B

Polarization

voltage

200V

Preamplifier

supply

120V

Preamplifier

supply

28V

0 V

Signal output B

RS 232 lines

AC AC

Intensity Power Module Type 12AB - Page 5

2. External Features

2.1 Front Panel

Thefrontpanelhasthefollowingfeatures(seeFig.2.1)

• Powerswitchandbattery-levelmeter.

Ifthepowersupplyiscorrect,thebattery-levelmeterwillpointtothegreenzone.Ifitpoints

totheredzone,eitherthebatteriesarelowandshouldbechanged(seesection3.1)orthe

externalDCsupplyvoltageistoolow.

• Intensity-probe’sOutputChannels(AOUT B).

BNCsocketsfortheintensityprobe’soutputsignals,takendirectlyfromthePROBE IN

connectorandsucceedinglyDC-decoupled.SeealsoblockdiagraminFig.1.2.

• RS232socket(RS - 232).

9-pinD-subconnectorforfacilitatinginteractiveremotecontrolofintensitymeasurements.

WiringdiagramshowninFig.2.2

• Probeinputsocket(PROBE IN).

12-pinLEMOinputconnectorforthetwomicrophonepreampliersoftheintensityprobe

aswellastheRS232linesforitspushbuttonsandLEDs.Wiringdiagramshownin

Fig. 2.3.

Fig. 2.1 Front panel of the Intensity Power Module Type 12AB

Battery-levelmeter

OputCh.B

Probeinput

12-pinLEMOsocket

Power,On/Offtoggleswitch

OutputCh.A

RS232

9-pinD-subconnector

Intensity Power Module Type 12AB - Page 6

Note:RS - 232andPROBE INareinterconnectedasfollows:

Line    RS - 232 PROBE IN

  DataTerminalReady Pin4   Pin12

  DataSetReady  Pin6   Pin9

  RequestToSend  Pin7   Pin11

  ClearToSend  Pin8   Pin10

Fig. 2.3 12-pin LEMO female socket 1B (external

view). The four inner pins are connected to

the socket shown in Fig. 2.2

Fig. 2.2 9-pin female D-sub connector socket for con-

necting directly to an RS232 computer port

(external view)

Intensity Power Module Type 12AB - Page 7

Fig. 2.4 Rear panel of the Intensity Power Module Type 12AB

2.2 Rear Panel

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

• Twist/releaseholderfor315mA(Slow).

• Inputsocketforanexternalpowersupplyof12 - 18 V DC;centrepin+terminal.Theuseof

anexternalpowersupplyautomaticallydisablespowerfromthebatteries.

• Lockingscrew

Unscrewtoremovebaseplateandgainaccesstointernalsettingswitches.

Fuse315mA(Slow)

Inputforexternalpowersupply

12-18VDC

Lockingscrewfor

baseplate

Intensity Power Module Type 12AB - Page 8

3. Internal Features

Note:switchtheType12ABoffanddisconnectitfromanyexternalpowersupplybeforeremov-

ingthebaseplateforanyreason.Afterwardsreplacethebaseplate.

Thebatterypackanduser-servicableswitchesarecontainedwithinthecabinetoftheType

12AB.Togainaccesstothese,rstremovetheknurledlockingscrew(seeFig.2.4)andslide

thebaseplateoff.

Fig. 3.1 Showing the battery pack of the

Intensity Power Module Type

12AB

3.1 Battery Pack

Takeoutthebatterytray(Fig.3.1)andreplaceallthebatteries(10xLR6(AA)standardalkaline

cells),makingsurethatthepolarityisasindicatedonthebatterytray.

3.2 User-servicable Switches

The(internal)user-servicableslideswitchesareshowninFig.3.2.

• Preampliersupplyselectpairofswitches:

- Polarization voltage2-positionswitch(applicabletobothchannels)selects:

0 V  forprepolarized(electret)microphones

or 200 V forexternally-polarizedmicrophones

- Supply voltage2-positionswitch(applicabletobothchannels)selects:

120 V formaximumdynamicrange

or 28 V forminimumpowerconsumption

Fig. 3.2 Showing the internal switches of the

Intensity Power Module Type 12AB

Polarizationvoltage

• 0 V

• 200 V

Supplyvoltage

• 120 V

• 28 V

Note:

SwitchofftheIntensityPower

Modulebeforechangingany

preamplierpowersettings

Intensity Power Module Type 12AB - Page 9

4. Operation

4.1 Batteries and External Power

TheType12ABcanbepoweredeitherbyinternalbatteries(Fig.3.1)orfromanexternalpower

supplyviatheDCinputontherearpanel(Fig.2.4).Ifanexternalpowersupplyisused,thebat-

terieswithintheunitwillbeautomaticallydisconnected.Externalpowershouldbe12-18VDC,

e.g.fromaG.R.A.S.mains/lineadapterAB0002(Europe)/AB0003(USA).

WhenevertheType12ABisswitchedon,thebattery-levelmeteronthefrontpanel(Fig.2.1)

shouldalwayspointtothegreenzonetoensurecorrectoperation.Ifitpointstotheredzone,

eitherthebatteriesarelowandshouldbechanged(seesection3.1)ortheexternalDCsupply

voltageistoolow.

4.2 PolarizationVoltageandPreamplierSupplyVoltage

Polarizationvoltagecanbeswitchedfrom200Vto0V(seesection3.2).Use200Vforstandard

externally-polarizedcondensermicrophones,and0Vforprepolarized(electret)microphones.

Preampliersupplyvoltagecanbeswitchedfrom28Vor120V.Use28Vforminimisingpower

consumption,itisalsosufcientformostapplicationsbutlimitsthedynamicrangeofthemicro-

phonepreampliersusedwiththeType12AB.Use120Vtoutilisethefulldynamicrangeofthe

microphonepreamplier.InthiscasethedynamicrangewillbedeterminedbytheType12AB.

Intensity Power Module Type 12AB - Page 10

5. Service and Repair

Repairsshouldbecarriedoutonlybyqualiedpersonal.TheIntensityPowerModuleType

12ABshouldnotbedismantledwithpoweronbecauseofhigh-voltagecircuits.

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