Boonton 92BD Bedienungsanleitung

BOONTON

INSTRUCTION

MANUAL

MODEL

928D

PROGRAMMABLE

MILLIVOLTMETER

b-877

INSTRUCTION

MANUAL

MODEL

928D

PROGRAMMABLE

MILLIVOLTMETER

b-877

TEL:

201-887-5110

TWX:

710-986-8241

ROUTE

287

SMITH

ROAD

PARSIPPANY,

N.J.

07054

USA

TABLE

CONTENTS

CHAPTER

GENERAL

INFORMATION

1.1

GENERAL

1 0 2 EQUIPMENT DESCRIPTION

1 0 2 0 1

Wide

Frequency

Range

1.2.2

Wide

Voltage

Range

1.2.3

True

RMS

Response

1o2.4

Low

Noise

1.2.5

Minimal

Zero

Adjustment

1.2.6

BCD

Output

1.2.7

Analog

Output

II.

SPECIFICATIONS

III

o OPERATION

3.1

INSTALLATION

3.1.1

Operating

Controls

and

Indicators

3.2

OPERATING

PROCEDURES

3.2.1

Initial

Operating

Procedure

3.3

OPERATING

NOTES

3.3.1

Overload

Limits

3.3.2

Connection

for

Measurements

Below

100

MHz

3.3.3

Connection

for

Measurements

Above

100

MHz

3.3.4

Low-Level

Measurement

3.3.5

Over/Under

Range

Indication

3.3.6

Making

the

Zero

Adjustment

3.3.7

Signal

Overload

Range

3.3.8

Temperature

Effects

3.3.9

Hum,

Noise,

and

Spurious

Pickup

3.4

LINEAR

OUTPUT

3.5

LOW-FREQUENCY

MEASUREMENTS

92BD

b-877

PAGE

TABLE

CONTENTS

(CONTINUED)

CHAPTER

306

CORRECTION

CURVES

FOR

ACTUAL

VOLTAGE

OUTPUT

3.7

CORRECTION

CURVE

FOR

MODEL

91-BB

3.8

CORRECTION

CURVE

FOR

MODEL

91-14A

IVo

THEORY

4o1

GENERAL

10 1 RF

Probe

4.1.2

Attenuator

and

Amplifiers

4.1.3

Synchronous

Detector

4.1.4

Shaping

Amplifier

4o1o5

Digital

Control

4 0

106

Analog/Digital

Converter

4o1.

Chopper-Driver

Circuits

1o8

Power

Supply

4o1o9

Programming

MAINTENANCE

5.1

PERIODIC CALIBRATION

5.2

PRECAUTIONS

WHEN

CHECKING

CALIBRATION

5o3

CALIBRATION

CHECK

5.4

CALIBRATION

PROCEDURE

5.5

TROUBLESHOOTING

PROCEDURE

5,5.1

Cover

Removal

92BD

b-877

5.5.2

Chopper

Replacement

5.5.3

Voltage

and

Resistance

Tests

5,5.4

Test

Points

5.5.5

Replacement

Probes

5,5,6

Probe

Tests

PAGE

TABLE

CONTENTS

(CONTINUED)

CHAPTER

VI,

INTERFACE

INFORMATION

6.1

PROGRAMMING

INPUTS

6.1.1

Input

Characteristics

6.1.2

Input

Pull-Up

6.1.3

Triggering

6.2

DATA

OUTPUTS

6.2,1

Output

Characteristics

6.2.2

Analog

Output

6.3

WAVEFORMS

6.3.1

Encode

Trigger

6.3.2

Data

Output

Timing

6.4

AUTORANGING

CHARACTERISTICS

SCHEMATICS

Amplifier

Chopper

Driver

Shaping

Amplifier

Autorange

Digital

Control

Counter

Board

A/D

Converter

Display

Board

92-8A

92-9A

830581

Sheet

830581

Sheet

830456

Sheet

830483

830581

Sheet

830546

Sheet

830546

Sheet

830546

Sheet

830650

830900

CHARTS

AND

DRAWINGS

FIGURE

Input

Resistance

Probe

Function

Input

Level

and

Frequency

Input

Capacitance

vs.

Input

Level

Model

91-12F

Probe

(Measured

MHz)

Typical

VSWR

Model

91-12F

Probe

with

Model

92-8B

50 n

Adapter

Typical

VSWR

Model

91-12F

Probe

with

Model

91-14A

Type

Tee

Adapter

and

91-15A

Termination

92BD

b-877

iii

PAGE

Endpapers

PAGE

CHARTS

AND

DRAWINGS

(CONTINUED)

FIGURE

Method

for

making

low-inductance

connections

test

signal

point

directly

the

probe

Assembly

Model

91-14A

Type

Tee

Adapter

Down-Scale

correction

Curves,

Recorder

Output

Model

91-SB

Adapter

correction

curve

Model

91-14A

Type

Tee

Adapter

Correction

Curve

Model

92BD

Block

Diagram

Frequency

Response

Test

Setup

Swept

Frequency

Response

Test

Setup

Calibration

Instructions

External

Connections

TABLE

NO.

Required

Accessories

Crest

Factors

TABLES

Model

Series

Controls

and

Indicators

Connection

Recommendations

TABLE

REPLACEABLE

PARTS

92BD

b-877

using

PAGE

GENERAL

INFORMATION

1.1

GENERAL

One

the

Model

Series

Millivoltmeters,

the

Model

92BD

provides

digital

readout

measurements

from

the

low

radio

frequencies

the

gigahertz

region,

over

voltage

range

200

µV

volts.

programmable,

solid-state

instrument

high

sensitivity

and

accuracy.

The

Model

92BD

exhibits

true

rms

response

for

input

signals

millivolts,

gradually

approaching

peak-to-peak

above

this

level.

The

digital

voltmeter,

however,

calibrated

rms

above

this

region.

The

instrument

characterized

high

input

impedance

(see

Figures

and

2),

excellent

stability,

and

low

noise.

small

edgewise

panel

meter,

calibrated

dBm,

included;

this

necessary

for

zeroing

the

instrument

(the

digital

display

blanks

out

below

200

µV),

and

will

also

serve

for

comparative

measurements

acceptable

accuracy.

binary

coded

decimal

(BCD)

output

provided

rear

connector,

permitting

the

92BD

integrated

systems

for

driving

printers,

tape

card

punches,

data

control

units,

and

simi-

lar

interfacing

data

equipment.

part

system,

the

92BD

also

programmed

and

controlled

externally

needed.

linear

output,

whose

level

proportional

the

input

voltage,

also

provided

rear

connector.

This

may

used

drive

recorder,

remote

indicator,

other

analog

devices.

The

92BD

offers

convenient

and

accurate

means

for

making

wide

variety

measurements.

Typical

uses

this

instrument

would

include:

transistor

testing

the

instrument

may

used

measure$,

ft'

and

other

transistor

parameters.

VSWR

and

return

loss

measurements

using

the

Model

Series

with

bridge

methods,

directional

couplers,

and

adjustable

slotted

lines.

92BD

b-877

Gain

and

loss

measurements

wide-band

amplifiers,

including

such

design

characteristics

stage

gain,

flatness

the

pass

band,

upper

cutoff

corner

frequency,

negative

feedback

factors,

and

other

parameters.

Proper

adjustment

tuned

circuits

narrow-band

amplifiers.

The

adjustment,

measurement

performance,

and

evaluation

parameters

filters.

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

92BD

available

several

optional

configurations

with

basic

accuracy

rdg.

fs.

The

standard

features

the

instrument

are:

Programmable

(logic

level).

Measures

from

200

µV

from

10 kHz

1.2

GHz.

True

rms

response

30 mV**·

Convenient

push-button

ranging.

BCD

digital

output

plus

analog

output.

High

input

resistance,

low

input

capacitance.

Overload

protection

400

Vdc,

Vac.

VSWR

less

than

1.15

1.2

GHz.

*To 300 V,

700

MHz,

with

accessory

100:1

divider.

**To 3 V,

700

MHz,

with

accessory

100:1

divider.

The

characteristics

the

instrument

include:

high

reliability,

fast

warm-up

minute),

long

intervals

between

calibrations,

plug-in

boards

for

ease

servicing,

light

weight,

and

other

advantages

solid-state

design.

1.2

EQUIPMENT

DESCRIPTION

The

Model

92BD

basically

programmable

analog

instrument

with

digital

readout.

available

with

full

range

options

and

accessories

described

Chapter

II.

Input

range

programming

logic

level

command

standard.

The

instrument

sensitive,

accurate,

sturdily

constructed,

and

protected

against

overloads.

will

perform

over

extended

periods

time

without

failure

need

for

recalibration.

92BD

b-877

packaged

compact

bench

instrument

that

can

easily

mounted

standard

19-inch

rack

using

inexpensive

hardware

kit.

Important

input

and

accuracy

specifications

are

reproduced

reference

plate

fastened

the

exterior

top

cover

the

instrument.

Clips

for

holding

out-of-use

accessories

are

provided

the

rear

the

instrument.

Calibration

instructions

are

reproduced

the

underside

the

top

cover

the

instrument.

Standard

accessories

supplied

with

the

Model

Series

include

one

each

the

following:

Model

91-12F

Probe

with

low-noise

cable

and

connector.

Model

92-8B

50-ohm

BNC

adapter.

Model

91-13B

Probe

Tip

(removable)

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

accessories.

1.2.1

Wide

Frequency

Range

The

calibrated

frequency

range

the

Model

92BD

extends

from

10 kHz

1.2

GHz,

with

uncali-

brated

response

beyond

8 GHz.

Relative

accuracy

above

1.2

GHz

typically

±0.5

dB.

Model

91-8B

50-ohm

BNC

Adapter

supplied

standard

accessory

with

the

instrument

for

50-ohm

voltage

measurements

600

MHz. A

correction

curve

(Figure

SA)

included

for

fre-

quencies

above

MHz.

For

higher

frequency

measurements

and

for

through-line

voltage

measure-

ments

the

optional

accessory,

Model

91-14A

Tee

Adapter,

recommended.

designed

compen-

sate

for

the

probe

capacitance

and

present

good

vswr

(better

than

1.15)

1.2

GHz.

may

used

conjunction

with

the

Model

91-15A

SO-ohm

load

for

terminated

voltage

measurements.

coaxial

line

its

insertion

loss

low;

however,

chart

(Figure

8B)

supplied

showing

loss

vs.

frequency.

See

Figure

for

typical

vswr.

optional

accessory,

the

Model

91-4C

Probe,

has

frequency

range

1 kHz

250

MHz

for

lower

frequency

applications.

1.2.2

Wide

Voltage

Range

The

Model

92BD

has

eight

ranges,

from

millivolt

full

scale

volts

full

scale,

arranged

1-3-10

sequence.

attenuator

attachments

are

required

for

measurements

volts.

While

this

range

ample

for

most

voltage

measurements,

the

capability

the

instrument

can

in-

creased

300

volts

(up

700

MHz)

using

the

optional

accessory,

Model

91-7C

100:1

Voltage

92BD

b-877

Divider.

Use

the

100:1

Voltage

Divider

also

increases

the

input

resistance

the

Model

91-4C

Probe

factor

greater

than

100.

1.2.3

True

RMS

Response

The Model

92BD

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

in-

strument

measures

non-sinusoidal

asymmetrical

signals

within

therms

region

without

loss

accuracy.

1.2.4

Low

Noise

The Model

92BD

has

been

designed

and

constructed

hold

noise

from

all

sources

a 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

94 Hz,

reducing

susceptibility

any

line-frequency-

fields.

unique

circuit

reduces

the

low-level

noise

originating

from

the

mechanical

chopper

and

renders

the

instrument

immune

changes

chopper

performance

that

could

occur

with

the

passage

time.

1.2.5

Minimal

Zero

Adjustment

Zero

adjustment

not

required

the

upper

five

ranges

the

Model 92BD.

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.

1.2.6

BCD

Output

The Model

92BD

provides

serialized

binary

coded

decimal

output

(4-line,

for

connection

external

system.

When

the

92BD

integral

part

system

configuration,

may

remotely

controlled

and

triggered

automatically

synchronism

with

some

system

event.

For

systems

external

requirements,

all

input

and

output

connections

for

the

92BD

are

made

the

card-edge

connector

the

rear

the

instrument.

See

Figure

for

receptacle

connections.

92BD

b-877

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