Kenwood VT-175 Manual de usuario

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INPAN

KENWOOD

CHANNELACVOLTMETER

VT-175

INSTRUCTIONMANUAL

KENWOOD

CORPORATION

CONTENTS

GENERAL3

FEATURES

SPECIFICATIONS

FUNCTIONAL

CONTROLS6

OPERATION8

6.APPLICATIONS10

MAINTENANCE13

8.ALIGNMENT14

9.CAUTIONSFORUSE••16

-2-

GENERAL

FEATURES

The

Model

VT-175

isdual-channelelectronicvoltmeter

sets

havingtwoindependentACvoltmetersina single

cabinet.Two-pointermeterallows

easy

dualmeasurements

andinter-channelcomparisons.

MODEL

VT-175

iswideband,highsensitivevoltmeterfor

use

anywherevoltagemeasurementsaremade,

with

remotecontrol

unit.

Theeasy-to-usevoltmeterprovides

frequencyresponseaswideas5Hzto

MHz,measurable

range

from

1mVto300V,and

input

impedanceof

10MO.

Twopowersourcecircuits,positiveandnegative,

are

providedforverystableDCbiasandrecover

from

anyoverloadina veryshorttime.

b.Small-sizedcompactconstructionis

easy

tocarry

andlarge-sizedtwo-pointermeteris

easy

toread.

Four-scaledialplateandredandblackpointers

allowquick,andaccuratevoltagereading.

Numberofadjustingtrimmersareminimized

with

amplifiersthatarepreciselycalculatedinopen

loop

gains

andarenegativefeedbacked

through

metal-

film

resistorsasaccurateas1%

Amplifiercharacteristicsthereforeare

from

secular

change.

Inputimpedanceisashighas10MOonallranges

anditsparallelcapacitance

less

than45pF

f.IndirectattenuatorswitchingbyrelayandFET

(field-effecttransistor)switchprovideshigher

reliability,signal-to-noiseratio,andinter-channel

crosstalk

thanmostpreviousdirectmethodofrotary

switch.

-3-

RangescanberemotelyselectedusingtheRT-61

(option).

h.Twochannelrange

setting

canbemadeeither

individually

together

(ininterlockedmanner).

i.A

ground

mode

selectormay

float

measuringcircuit

aboveground.

3.SPECIFICATIONS

[Meter

Section]

Measurablevoltages:

mV-300Vin12ranges:

mV,3mV,10mV,30mVr100mV,

300mV,1V,3 V,10V,30V,100Vand

300V.

full

scales.

dB:

-80~+50dB(0dB= 1V).

dBm: -80~+52dBm(0dBm=

mW,600n).

Error

Within

± 3%of

full

scaleat1kHz.

Frequencyresponse: ± 10%at5Hz—

MHz,

±5%at10Hz-500kHzand

±3%at20Hz-200kHzas

±2%

at30Hz~100kHz

referencedto

kHzresponse.

Input

impedance: 10MO±5%,

with

less

than

45pF

parallelcapacitance.

Durable

input

voltage:500V(DC+ACpeak)

at1V—300Vrange

100V(DC+AC

peak)

at1mV~300mVrange

Stability: Within±0.5%of

full

scale

fori

10%

linevoltage

fluctuation.

-4-

-5-

Residual

voltage:

Less

than

20^V

with

input

shorted

mVrange-

Crosstalk,Individual:

Less

than

-80dB

with

other

input

terminated

with

600O

Inetrlock:

Less

than

-50dB

with

other

input

terminated

with

600O.

[Amplifier

Section]

Gain

: Approx.60dB.

Output

voltage: 1Vrms(Full

scale)

±20%

Output

impedance:600X1+20%

Distortion

Less

than

1%at

full

scale.

(Rated

bysignal-to-noise

ratio

mVand

ranges.)

Signal-to-noise

ratio:

Over40dBat

full

scale.

Frequencyresponse:

Within

± 3dBat5 Hz—500kHz

[Environmental]

Coefficient:± 0.08%/°C

Temperature

(within

specification): 10~40°C

(full

operation):

0~50°C

Relative

humidity

Less

than

80%

[PowerSupplySection]

Line

voltage: 100,120,220VAC+ 10%,

216- 250VAC,50/60Hz

Powerconsumption:Approx.7W

[Dimensions]Wx190(212)Hx238(268)Dmm.

Values

in( ) includeprotrusions.

[Net

weight]

3 kg

[Accessories

]

Powercable:

pc.

Input

cable: BNCcord,2pes.

Replacementfuse: 0.3A2pes.

0.5A 2pes.

Instruction

manual:

copy.

4.FUNCTIONALCONTROLS FrontPanel(seeFigure1)

Figure

1 - FrontPanelView

REFER-

ENCED.

IDENTIFICA-

TION

DESCRIPTION

® Power-onindicator

(LED)

on-off

switch

RANGE-CH

1/2

Channel

1 and2 atten-

uatorselector

INPUT

Channel

input

connector

CH2

SELECTOR

Individual-interlock

rangesettingselector

CH2

INPUT

Channel

input

connector

RANGE-CH

Channel

2 attenuator

selector

GND

MODE Negative

input

floating

switch

® Meterzero-adjust

trimmer

•CH1(left),CH2(right}

-6-

RearPanel(seeFigure2)

Figure2 - RearPanelView

REFERE-

NCE

No.

IDENTSFSCA-

.TION

DESCRIPTION

® GND

Casing

grounding

post

CH2

OUTPUT Channel2

monitor

output

connector

® Line

voltage

selector

andfuse

holder

® Power

Gable

connector

CH1

OUTP' Channel1

monitor

output

connector

CONT.

INPUT Remote

control

mounting

hole

_7_

5.OPERATION

•Set-up

(1)

Press

the

ON/OFF

Pushswitch©in.ThePower-on

indicator®,a

light-emitting

diode,will

light,

indicat-

ingthatpowerhasbeenapplied.

(2)

Plugthesignalcalbes

into

theCH1

INPUT

andCH2

INPUT

connectors® and© .

(3)

CH2SELECTOR©,

with

theswitch

released(JH),

takes

singlemodeinwhich

Ranges

andCH2 are

changedoverugingAttenuatorsCH1/2©andCH2®,

respectively.'

. ' •

Withtheswitchpressed

(-—-),

the

SELECTOR

takes

interlockmodeinwhich

both

Ranges

andCH2

are

simultane-ouslychangedoverusingAttenuator

1/2®.Intheinterlookmode,AttenuatorCH2®

nolongeroperabletoselecta

Range.

Select

eithersingleorinterlookmodeaccordingto

yourparticularmeasurement.

(4)

Setthe

RANGE-CH

1/2selector©andthe

RANGE-

CH2

selector® to"300V/TomeasureanACvoltage

superimposedona DCvoltage,besuretosetthe

selectors

tothepositionsbeforeconnectingthecables

topointstobemeasured.rerwise,theDCvoltage

causes

a highsurge,whichcouldburnvoltmeter.

(5)

GNDMODE®iseffected

with

theswitchreleased

(•)r

inwhich

both

andCH2areconnectedto

thegroundingterminalofthecasing,takingGND

state,

with

theswitchpressed(-•».),thegroundingof

andCH2isfloatedto

OPEN

stateinwhich

youmovetheearth

point

tothesignalsourceside.

NormallyusethedeviceintheGNDstate.

(6)

Connectthecablestopointstobemeasure.

(7)

Turntheselectors® and© forproperranges

until

each

Meterpointerswitngsoverone

third

ofthe

fullscale.

(8)

OUTPUTS

CH2@ andCH

@ provide

output

signals

byamplifying

input

signalsinsuch

degreeasthesignalamplitudeofa meterfull-

scale

becomes1 Vrmsnomatterwhichrangeisset.

(9)

Read

theMeter.

-8-

(1)

Voltage

Scales

See

Figures

There

aretwoblackvoltage

scales

: a

scale

graduated0 to10anda

scale

RANGE

selector® isat"1V,forexample,the

division10onthe

scale

® indicates1V.Atthe"300

mV"position,thedivision3 onthe

scale

® indicates

300

mV.Similarly,theother

RANGE

selectorpositions

showtheir

full

scale

values.

(2)

Scale

Ingeneral,thedBvaluesareexpressedindBVwhich

unit

referencedbyOdBequalto1 V.Thedivision

atthe

scale

® correspondsto0 dBonthedB

scale,

whichisa voltage

ratio

scale.

Sincethe

RANGE

selectorhas12rangepositionsinstepsof10dB,the

voltage

ratio

of1 mVto300Vis110dBattenuation.

Assume

a referencevoltagelevelonthe

scale

® be

with

the

RANGE

selectorat"1V,"a givenvoltage

can

bereadaslowas-60dB(1mV)by

turning

the

selectordownward.Further,asthe

scale

A allows

readingto—20dB(0.1mV),youcancontinuously

measure

thevoltage

ratio

high

as-80dB(0.1mV

to1V).Thereadof-80dBmeansa signal-to-noise

ratio

ofaround10dB.Also,thedB

scale

allows

continuousmeasuringupto+50dB(1to300V)by

turning

theselectorupward.

(3)

dBm

Scale

Ingeneral,voltmetershavea referenceleveldivision

ofOdBmequalto0.775V(1mWpower)inducedacross

800Oresistanceload.Therefore,thedBm

scale

available

tomeasurea powerlevelreferencedto0

dBm,

with

theimpedanceofthegivenpowercircuit

being60012pureresistance.Wheremeasuredacross

specific

resistanceloads,forexample,10kO,other

thanthe600Oload,thelevelsaresometimes

expressed

indBs.

Figure

3 - Meter

Scale

Graduation

™9-

•HowtoUseRemoteControl 6.APPLICATIONS

The

RT-61option,a remarkablefeatureofthe

VT-175,

providesa remotecontrolcapability.Tousetheoption,

removethe

case

andtherear-panelblindplate,install

theconnectorsuppliedwiththe

RT-61,

thenplugthe

RT-61

into

the16-pinconnectoronthe

circuit

board.

Fordetails,refertotheRT-61Instruction

Manual.

The

basic

useofyourvoltmeteristomeasuresinusoidal

wave

voltagesasanACvoltmeter.Inaddition,it

providesa widevarietyofapplicationsasdescribed

below.

AmplifierGainMeasurement

Voltmeteriscapableofmeasuringanamplifiergain,

whichisa signalmagnificationfrom

point

A toB in

Figure

4 witha signalgeneratorconnectedtotheamplifier

input.IfthemeasuredsignallevelsatpointsA andB

are

a andb dB,respectively,thenthegainis(b-a)dB.

Figure

4 - AmplifierGainMeasurement

Also

themethodisapplicableformeasuringanopen

loop

gainofeachamplifiercircuitwiththenegative-

feedback

signal

leaves

applied.Further,themethodc

beusedformeasi"thefrequencyresponsesofgiv

SIGNAL

GENERATOR

-10-

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