Boonton 92A Manual de usuario

MODELS

92A/92AB

PROGRAMMABLE

MiLLIVOLTMETER

92A/AB

b-1271

BOONTON

ELECTRONICS

CORPORATION

Route

287

Smith

Road

Parsippany,

07054

ifcjooMTor^i

MItLIVOLTMETER

9009

MODEL

JliiAfi

CHAR6E

MODEL

92AB

BATTERY

OPERATED

MiLLiVOLTMETER

CHAPTER

NTRODUCTION

GENERAL

The

Model

Series

Millivoltmeter

provides

accurate

readout

measure¬

ments

from

the

low

radio

frequencies

the

gigahertz

region,

over

voltage

range

200

volts.

programmable,

solid-state

instrument

high

sensitivity

and

occuracy,

characterized

high

input

impedance

(see

Figs.

and

2),

excellent

sta¬

bility,

and

low

noise.

The

Model

exhibits

true

rms

response

for

input

signals

millivolts,

gradually

approaching

peak-to-peak

above

this

level.

The

meter,

however,

cali¬

brated

rms

above

this

region.

Input

and

output

connections

for

externa!

control

and

readout

are

provided

22-pin

card-edge

connector

the

rear

the

instrument.

linear

output,

whose

level

proportional

the

input

voltage,

also

provided

rear

connector.

This

may

used

drive

recorder,

remote

indicator,

other

analog

devices.

The

offers

convenient

and

accurate

means

for

making

wide

variety

mea¬

surements.

Typical

uses

this

instrument

include:

transistor

testing

the

instrument

may

used

measure

f^.,

and

other

transistor

parameters.

VSWR

and

return

loss

measurement

using

the

Model

Series

with

bridge

methods,

directional

couplers,

and

adjustable

slotted

lines.

Gain

and

loss

measurements

wide-bond

amplifiers,

including

such

de¬

sign

characteristics

stage

gain,

flatness

the

pass

band,

upper

cut-off

corner

frequency,

negative

feedback

factors,

and

other

parameters.

Proper

adjustment

tuned

circuits

narrow-band

amplifiers.

92A/AB

0-1170

The

adjustment^

measurement

performance,

and

evaluation

filter

parameters.

Measurement

vswr

return

loss

and

attenuation

attenuators.

Measurement

output

levels

signal

generators,

adjustment

baluns,

harmonic

distortion

signals,

and

adjustment

circuits

for

minimum

voltage

(null)

maximum

voltage

(peak).

The

Model

available

several

optional

configurations

with

basic

accu¬

racy

rdg.

fs.

The

standard

features

the

instrument

are:

Remote

programmability

Measures

from

200

3V*

from

kHz

GHz.

True

rms

response

mV**

Convenient

push-button

ranging.

analog

output.

High

input

resistance,

low

input

capacitance.

Overload

protection

400

Vdc

Vac.

VSWR

less

than

=15

1.2

GHz.

300V,

700

MHz,

with

accessory

100:1

divider.

3V,

700

MHz,

with

accessory

100:1

divider.

Thecharacteristicsof

the

instrument

include:

high

reliability,

fast

warm-up

min-

ute),

long

intervals

between

calibrations,

plug-in

boards

for

ease

servicing

modifying,

lightweight,

and

other

advantages

sol

id-stage

design.

EQUIPMENT

DESCRIPTION

The

Model

basically

programmable

analog

instrument

with

linear

out¬

put.

available

with

full

range

options

and

accessories

described

Chap¬

ter

II.

Input

range

programming

external

contact

closure

PNP

transistors

ground

standard.

The

instrument

sensitive,

accurate,

sturdily

constructed,

and

protected

against

overoads.

will

perform

overextended

periods

time

without

failure

need

for

recalibration.

packaged

acompact

oench

instrument

that

can

easily

mounted

standard

19-inch

rack

using

optional

rack-mounting

kit.

92A/AB

a-1170

Important

Input

and

accuracy

specifications

ere

reproduced

reference

piate

fastened

the

exterior

top

cover

the

instrument.

Clips

for

holding

out-of-use

ac¬

cessories

are

provided

the

rear

the

instrument.

Calibration

instructions

are

re¬

produced

the

underside

the

top

cover

the

instrument.

Standard

accessories

supplied

with

the

Model

Series

include

one

each

the

toi

lowing:

Model

91-12F

Probe

with

low-noise

cable

and

connector.

Model

-8B

50-ohm

BNC

adapter.

Model

91-13B

Probe

Tip

(removeable)

with

grounding

clip

lead,

complete

kit

probe

accessories

available

optional

equipment.

Including

storage

case

with

space

for

the

Model

91-12F

Probe

and

the

other

standard

ac¬

cessories.

1,2.1

Frequency

Capability

Thecalibrated

frequency

range

the

Model

extends

from

kHz

GHz

with

uncalibrated

response

beyond

GHz.

Relative

accuracy

above

GHz

typically

±0.5

dB.

instnl^nTfor

standard

accessory

with

the

3*2

voltage

measurements

600

MHz.

correction

curve

fFia-

'ociuded

for

frequencies

above

SOM^Hz.

For

higher-frequency

measurtrnents

Adloter^ir^^"

volfage

measurements

the

optional

accessor^

Model

9i-i4A

Tee

Adapter,

recommended,

designed

comoensate

for

fhp

and

present

good

vswr

(better

than

.15)

upTo

u^^

junction

with

the

Model

5A50-ohm

load

for

terminated

voltage

Lesure^

1.2.2

Voltage

Capability

The

Model

has

eight

ranges,

from

millivolt

full

scale

volts

full

scale,

arranged

1-3-10

sequence.

attenuator

attachments

are

required

for

measure-

ments

volts.

While

this

range

ample

for

most

voltage

measurements,

the

capability

the

instrument

can

increased

300

volts

(up

700

MHz)

using

the

optional

accessory.

Model

91-7C

100:1

Voltage

Divider.

Use

the

100:1

Volt¬

age

Divider

also

increases

the

input

resistance

the

Model

91-4C

Probe

fac¬

tor

greater

than

100.

92A/AB

a-1170

o2„3

True

RMS

Response

The

Model

provides

true

rms

response

for

signal

inputs

below

approximately

millivolts

(below

volts,

700

MHz,

with

the

Model

91-7C

100:1

Voltage

Divider).

the

input

level

increases,

the

waveform

response

gradually

approaches

peak-to-peak,

calibrated

the

Indicator

rms.

Thus,

addition

making

precise

sinusoidal

voltage

measurements

all

levels,

the

instrument

measures

non-sinusoidal

asymmetrical

signals

within

the

rms

region

without

loss

accuracy.

.2.4

Low

Noise

The

Model

has

been

designed

and

constructed

hold

noise

from

all

sources

minimum.

The

probe

cable

special

low-noise

design;

vigorous

flexing

causes

only

momentary,

minor

deflections

the

most

sensitive

range.

The

Model

91-12F

Probe

not

sensitive

shock

vibration;

even

sharp

tapping

the

probe

barrel

causes

visible

deflection

any

range.

Amplification

takes

place

Hz,

reducing

susceptibility

any

line-frequency-related

fields.

unique

circuit

reduces

the

low-level

noise

origin¬

ating

from

the

mechanical

chopper

and

renders

the

instrument

immune

changes

chopper

performance

that

could

occur

with

the

passage

time.

.2.5

Minimal

Zero

Adjuslment

Zero

adjustment

not

required

the

upper

five

sensitivity

ranges

the

Model

92.

For

measurements

the

lower

three

ranges,

the

ZERO

control

set

the

most

sensitive

range

before

operation.

This

control

balances

out

small

thermal

voltages

the

probe

elements

and,

once

adjusted,

requires

only

infrequent

checking

during

the

course

subsequent

measurements.

92A/AB

q-1170

1.2o6

Output

The

provides

linear

output

whose

current

capability

into

1000

ohms

extremely

stable^

When

used

part

automatic

test

system,

the

fast

re¬

sponse

the

instrument's

output

input

step

function

allows

tests

per

unit

time.

For

system

external

requirements,

all

input

and

output

connections

for

the

are

made

the

card-edge

connector

the

rear

the

instrument.

(See

Figure

for

receptacle

connections.)

CHAPTER

Voltage

Range:

Full

Scale

Voltage

Range:

dBm

Range;

Frequency

Range:

Accuracy:

300

2CK)

pVto

300mV*

Meter:

Meter

Unrest;

range

only)

92A/AB

a-1170

SPECIFICATIONS

200

|jV

(300V

700

MHz

with

accessory

00:1

voltage

divider)..

Voltage

sensitivity

100

pV.

10,30,

100,

300,

1000,

and

3000

mV.

-60

+23

dBm

(463

dBm

700

MHz

with

optional

accessory.

Model

91-7C

100:1

Voltage

Divider).

kHz

GHz

(uncalibrated

response

approximately

GHz),

plus

rdg

kHz

150

MHz

700

MHz

GHz

*Below

mV,

add

4-1/2

inch

taut-band

Two

linear

voltage

scales

0.05

per

division

10;

0.1

per

division

One

logarithmic

dBm

scale

-10

43;

0.2

per

division

max.

Indicated

Voltage

Unrest

Above

600

300

600

300

Power:

RFI:

Temperature:

Waveform

Response:

Crest

Factor:

Input

Impedance:

VSWR:

Power

Sensitivity:

Output:

Dimensions:

92A:

115

230

±10%,

400

Hz.

92AB:

115

230

±10%,

400

Hz,

and

two

18-voit

chargeable

batteries

There

detectable

radiated

conducted

leakage

from

instru¬

ment

probe.

accordance

with

ANSI

(ASA)

Spec.

39.7

Temperature

Range

Temperature

Influence

Instrument

Probe

Ref.

21°

25°

Normal,

18°

30°

Severe,

10°

40°

±1%

rdg

±1%

rdg

±4%

rdg

True

rms

response

for

input

levels

(3V

700

MHz

with

100:1

Voltage

Divider),

with

transition

peak-to-peak

(cali¬

brated

rms)

higher

levels.

420

depending

upon

input

level

(see

Table

11).

See

Figures

and

Less

than

,15

1.2

GHz

(Return

Loss

greater

than

dB).

See

Figures

and

200

pW,

minimum

detectable

power

ohms.

Vdc

proportional

input

voltage*

Source

resistance

kO;

deliver

into

lood.

Full

scale

Input

step

func¬

tion

response

time

less

than

100ms

30mV

3Vfs

ranges,

in¬

creasing

sec.

the

range.

5.2"

(without

rubber

feet),

8.3"W

(1/2

standard

inch

rack

module)

11.5"

(132

211

292

mm).

92A/AB

0-1170

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