Kenwood VT-172 Manuel utilisateur

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JAPAN

NOISE

METER

VT-172

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

KENWOOD

CONTENTS

GENERAL3

FEATURES

3.SPECIFICATIONS4

4.CONTROLSANDINDICATORS7

5.OPERATION10

6.PRECAUTION11

7.MAINTENANCE12

8.ADJUSTMENT. 13

9.APPENDIX16

-2-

GENERAL

The

Noisemeterisanhigh-sensitiveelectronicvoltmeter

havinga maximumsensitivityof10M/fullscale.Its

widefrequencyrangecovers

from

10Hzto500kHz(1mV

~300V)

andthefivetypesofweightingareselectable.

Inaddition,DINor

CCIR

quasi-peakoraverage

detection

with

RMSdisplayisselectable,making

possibleS/Nandnoisemeasurementsinaccordance

with

IS-A,

DIN

NOISE,

DINAUDIO,

CCIR

and

CCIR/

ARM

standards.

The

unitsarealsoprovided

with

anoverloadindicator,

10dBrangerelativereferenceadjustmentandACand

outputs.

10#Vfullscalemaximumsensitivity

with

0.2/^V

graduated

scale

formeasurementsdownto-120dB.

b.Buttonselectionof

JIS-A,

DIN

NOISE,

DINAUDIO,

CCIR

and

CCIR/ARM

weightingfiltersmake

possiblenoisemeasurementsandS/Nmeasurements

inaccordance

with

a varietyofstandards.

addition

toaveragedetectionandRMSdisplay,

DINand

CCIR

semi-peakdetection

with

RMS

displayisavailableformeasurementsinaccordance

with

thosestandards.

ACOUTandDCOUTterminalsareprovidedto

facilitatewaveformobservation,recordingof

measured

valuesoruseofthe

unit

asanamplifier.

A relativereferenceadjustment

from

0 10dB

makes

possiblerelativemeasurementsofsignals

with

respecttoanarbitrarilysetreferencelevel,

particularlyusefulinS/Nmeasurement.

f.Anoverloadindicationpreventsmeasurementerrors

caused

distortion

notdetectedbytheoperator

byviewingthemeterlevelforuse

with

the

weightingfilters.

FEATURES

-3-

3.SPECIFICATIONS

-4-

[Voltmeter

Section]

Voltage

ranges: > 10/A/-300V(10/A//30/<V/100M//

300M//1mV/3mV/10mV/30mV/

100mV/300mV/1V/3V /10V/30V/

100V/300V)fullscale

dB: -120~+50dB(0dB=1V)

dBm: -120~+52dBm(0dBm= 1mW/600O)

Displayaccuracy:

With

average

detection

FLAT

mode:

10#Vand30/A/ranges:

within

±5%offullscale

100/xV—300Vranges:

within

±3%

offullscale

With

quasi-peak

detection

and

DIN

NOISE,

DINAUDIOor

CCIR

weighting

filter:

W/AV

range:

within

±7%of

fullscale

30/tV~3G0V

ranges:

within

±5%

offullscale

Frequencyresponse:

With

average

detection

andRMS

display

10/iVrange:20Hz~10kHz±5%

10Hz~30kHz±10%

30/A/—300/A/ranges:

20Hz~20kHz±5%

10Hz~100kHz±10%

1mV~300Vranges:

20Hz~100kHz±3%

15Hz~300kHz±5%

10Hz~500kHz±10%

With

quasi-peak

detection

and

RMS

display

10/iVrange:30Hz~15kHz±5%

20Hz~20kHz±10%

10Hz~30kHz±20%

30/A/—300Vranges:

30Hz~20kHz±5%

20Hz-50kHz±10%

10Hz~100kHz±20%

input

impedance: 1MO±5%

Parallelcapacitance:

50pFor

less

-5-

Overloadvoltagelevel: 10/A/—300/A/ranges:

10Vrms,DC500V

1mV~300mVranges:

80Vrms

500V(DC+ACpeak)

1V—300V

ranges:

500V(DC+ACpeak)

Relative

referenceadjustment:

0~approx.-12dB

Over

level: Lightsuporflickerswhena

signalofmorethan+15dBfor

maximumvalueisapplied.

This

indicates

that

thereisa

possibilityoferroneous

indication

duetoover

input

whena level

weighting

filter

used.

Residual

noise: Average

detection

10AV

range

input

shorted,

Input

equalityvalue

Below1.5M/rms(1.0/iVrmsTYP.)

30/iVrange,

input

shorted,

Input

equalityvalue

Below5/iVs(3.0/A/rmsTYP.)

Peak

detection

10/A/

range

input

shorted,

Input

equalityvalue

Below2.0/iVrms(1.0/iVrmsTYP.)

30M/range

input

shorted,

Input

equalityvalue

Below5/iVrms(3.0/A/rmsTYP.)

Stability:

Within

±0.5%offullscalefor

10%

linevoltagefluctuation.

[AmplifierSection]

AMPLIFIER

Gain

: Approx.100dB

Output

voltage: 1Vrms± 10%

Output

resistance: 800O± 10%

Distortion

: Below1%offullscaleat1kHz

This

distortion

isdeterminedby

theS/Nfortheranges10M/~

300/W

S/N

With

respecttofullscale:

1mV~300Vranges:40dB

minimum

300/^V

range:30dB

minimum

10U«Vrange:25dB

minimum

30MArange:20dB

minimum

*~'Vrange:16.5dB

minimum

Frequency

response: 1mV~300Vranges:

10Hz~500kHz

within

±3dB

30/A/—300M/

ranges:

10Hz~150kHz

within

±3dB

10/iVrange:

10Hz~30kHz

within

±3dB

OUTPUT

AMPLIFER

Output

voltage: 1V±10%forfullscale

Output

resistance: 600O±10%

Frequency

response: Approxthesameasthemeter

indication.

[Environmental]

coefficient: 0.08%/°Cor

less

(at

1mVrangeormore)

Operatingtemperatureand

humidity

for

within

specification: 15~35°C,80%RHmaximum.

Full

operatingrange: 0~50°C,80%RHmaximum.

[PowerSupplySection]

Supplyvoltage:

100/117/220/240VAC

±10%

(Max. 250VAC)50/60Hz

Power

consumption: Approx.15W

[Dimensions]

Width

128mm,Height190(214)mm

^Depth285(315)mm

(

) dinsionsincludeprotrusions

from thebasic

case.

[Weight]

4.6kg

[Accessories]

Powercard1

Input

cable(CA-41)1

Instructionmanual............1

-6~

4.CONTROLSANDINDICATORS

FRONT

PANEL

POWER

(ONj>l/OFF* ) Switch

powerswitch.

®PowerLamp

IndicatestheVT-172ispoweredup.Lightswhen

POWER

isdepressed.

RANGE

SelectorSwitch

Attenuatorselectorswitch.16positionsin10dB

steps.

Toprevent

excessive

inputs,thisswitchis

startedinthehighest,300Vrangeandgradually

workeddownrangetoprovideaneasilyreadable

meterdeflection.

®INPUT

Juck

BNC

signal

input

connector.

RELATIVE

REFControland© UNCALLamp

Sensitivityadjustmentanduncalibratedannunciator.

than10dBofadjustmentispossible.When

the

control

isturned

fully

clockwise,thesetrange

calibrated.This

control

canbeusedtoadjust

themetertoanappropriatelevelforrelative

measurements.

- Whennotsetat

fully

clockwisethe

UNCAL

lamplightstowarntheoperator.

Fig.

1 Frontpanelview

-7-

OVERLEVEL

Lamp

Whenusingweightingfilterstheeffectofthe

filter

istomask

from

theoperatorthepresence

ofanexcessively

high

input

level.Thus

distortion

andtheresultingerrorscanoccur

without

the

operatorbeingawareofthiscondition.Toprevent

thisthe

OVERLEVEL

warninglampalertsthe

operatorwhenthe

input

levelgoes+15dBabove

the

full

seal

level

(OdB).

AVERAGE/PEAK

Switch

This

switchisusedtoselectthedetectionmethod.

Inthereleased

position

averagedetectionand

RMS

displayareineffect.Depressingtheswitch

selects

eitherDINor

CCIR

quasi-peakdetection

andRMSdisplayofthesignallevel.When

CCIR/

ARM

isselectedthedetection

method

isauto-

maticallyswitchedtoaveragedetectionandRMS

displayregardlessofthe

position

ofthisswitch.

WEIGHT

Switch

group

This

six

position

selectionswitch

group

allows

selectionofoneof

FLAT

JIS-A,

DIN

NOISE,

DINAUDIO,

CCIR

CCIR/ARM

weighted

response.

Selectionofthe

FLAT

position

turns

the

unit

into

a widebandACvoltmeter.Ifno

button

isdepressed,themodeisautomatically

CCIR/ARM.

JIS-A

Used

fornoiselevelmeasurementsinaccordance

with

JSS:C1502A,

JIS"C5551A,

IEC-A,

and

IHF-A

standards.

DIN

NOISE

;

Used

fornoiselevelmeasurementsinaccordance

with

DINstandard45405.

DINAUDIO: "

Used

for1QHz~2.0kHz:.audiolevelmeasurementsin

accordance

with

DINstandard45405.

CCIR

Used

formeasurementsofnoiselevelinaccordance

with

CCIR

standards..

CCIR/ARM

Used

fornoiselevelmeasurementsinaccordance

with

CCIR/ARM

standards.

This

measuringequipmentisrecommendedby

DolbyLaboratorie.

Whenthe

CCIR/ARM

filter

isused,average

detectionisusedregardlessofthe

AVERAGE/

PEAK

switch.

-8~

The

appropriate

AVERAGE/PEAK

switchsettings

thevariousfiltersare:

for.

Filter

AVERAGE PEAK

JIS-A

DIN

NOISE

-o

DINAUDIO o o

CCIR

-o

CCIR/ARM

METER

Zero-adjustTrimmer

Fig.

2 Rearpanelview

»9-

REAR

PANEL

©AC

OUTPUT

Juck

This

output

isusedforwaveformobservationor

forusedoftheVT-172asanamplifier.

OUTPUT

Juck

This

output

isusedforrecording

off-line

measured

values.

®GNDTerminal

Groundconnection.

©AC

POWER

Connector

This

isACpower

input

connector.Usethepower

cordprovided

with

the

unit.

LINE

VOLTAGE

Selector

Set

the

plug

ofthisselectortothelocalline

voltage(100/117/220/240VAC).

FUSE

HoWer

Use

a screwdrivertoopenthisholderfor

replacementofthefuseofspecifiedrating.

For

100or117V: 0.5A

For

220or240V: 0.3A

5.OPERATION

Checkthemechanicalzeroingofthemeter.

Connectthesignalcableto

INPUT

Setthe

RANGE

switch® tothe300Vrange.

Connectthepowercordandpressthe

POWER

switchto

turn

the

unit

ON.TheredLED©

should

light

indicatingthe

unit

isreadyforuse.

Input

thesignaltobemeasuredandifnecessary

graduallyswitchtolower(moresensitive)ranges

until

easy

toreadmeterdeflectionisobtained.

USING

RELATIVE

REF

makemeasurements

with

respecttosomearbitrary

referencelevel,

input

thesignaltobeusedasthe

referencelevelanduse

RELATIVE

REF© to

obtain

OdB

meterdeflection

without

changingthe

RELATIVE

REF

settingmeasurementofothersignalscanbemade

andreaddirectlyoffthedB

scale

indB

with

respect

tothereferencelevel.

The

adjustmentrangeofthe

RELATIVE

REF

control

from

0 to-12dB(negativeonly)sotosetOdBfor

signalunderOdBswitchingdownrangemustbedone.

-10-

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