Brüel & Kjær 2007 Guía del usuario

Instructions

and

Applications

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Heterodyne Voltmeter

Type 2007

A portable, mains

battery operated

instrument with voltage ranges

from

fA-

V to 100 V, covering

the

100 kHz to

305

MHz frequency

ranges

for

carrier

modulation

measurements on AM

signals.

Features include a peak

diode

detector

for

TV measurements,

manual

remote voltage controlled

frequency tuning, a

built

in loud-

speaker

for

easy signal identification

and

self

contained rechargeable

batteries and charger.

HETERODYNE VOLTMETER TYPE 2007

August 1972

CONTENTS

INTRODUCTION

......................................

CONTROLS

...............

..........................

2.1. Measurement Probe and Probe Accessories

..........

2.2.

Front

Panel

2007

...........................

2.3.

Rear

Panel

2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. OPERATION

.........................................

3.1. Preliminary

...............

Operation Using Mains

Line Voltage Supply

.....

Operation Using the

Built-in

Battery Supply

.......

3.2. Reference Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3. RF Carrier Voltage Measurements . . . . . . . . . . . . . . . 18

3.4.

Modulation

Measurements

....................

Using Heterodyne

Voltmeter

Type

2007

..........

Using Heterodyne

Voltmeter

Type

2007

with

Measuring

Amplifier

.......................

3.5.

Distortion

Measurements

...

..................

. 22

3.6.

Use

Remote Tuning and Ext. Batt. Socket

.......

Remote Frequency Tuning

.....................

Operation Using

External Battery

.............

Carrier Detector

Output

. . . . . . . . . . . . . . . . . . . . . . .

Output

.................................

4. DESCRIPTION

..................................

....

4.1. Measurement Probe

..........................

4.2. Heterodyne

Voltmeter

........................

Input

Section

...............................

Frequency Selective Section . . . . . . . . . . . . . . . . . . . . 32

Detection and

Amplification

.......

.........

Power Supply

...............................

APPLICATIONS

......................................

5.1. Antenna

Distribution

Systems

..................

Signal Strength

and

Transmission

Loss

............

Cross-Talk

........

........................

IntermoduIation

Distort

ion . . . . . . . . . . . . . . . . . . . .

Amplifier

Sensitivity

Mains Noise

..............

5.2. Antenna Measurements

........................

Use

a Field Strength Meter . . . . . . . . . . . . . . . . . . .

Directivity

Receiving Antennas

...............

5.3. Checking

Output

a Signal Generator

...........

5.4. Measurement

Output

Impedance

..............

5.5.

Automatic

Recording

Modulation Response

......

SPECIFICATIONS

.....................................

INTRODUCTION

The Heterodyne

Voltmeter

Type 2007

a portable, completely self-

contained, precision instrument, designed

for

voltage, frequency and

modulation measurements on radio frequency signals.

basically a high

quality

super heterodyne receiver

with

detector and FM discriminator

for

measurements on amplitude and

frequency modulated signals

and

apeak diode detector

for

measurements

signals. The heterodyne section

the instrument features voltage

controlled

tuning

over eight frequency

ranges

covering

100kHz

305 MHz, plus selectable wide and narrow measurement bandwidths

±100kHz

and±

1.25 kHz respectively. Tuning may be carried

out

using the

instrument's course and fine

tuning

controls

regulate

internal voltage,

may

accomplished remotely using

external voltage. The tuned-in

frequency

indicated on a frequency meter, which

for

measurements

also provided

with

interchangeable meter

scales

on which American and

European

channels

are

indicated.

The

output

section

the 2007

a quasi

RMS

voltmeter which

for

carrier measurements

has

voltage sensitivities ranging

from

100

Volt

full

scale.

For

modulation measurements the meter

calibrated in

modulation percentage (0

80%)

for

amplitude modulated signals and

frequency deviation

80kHz)

for

frequency modulated signals.

Unlike

conventional instruments

this

type

the 2007

need

only

calibrated at one frequency

for

which

built-in

27 MHz reference signal

provided. Once calibration

has

been applied

valid at all

other

frequencies in the measurement range

the 2007.

The power supply

the 2007

completely self contained.

may

operated

from

either

a mains supply

from

five rechargeable nickel

cadmium cells which

are

built-in

along

with

a battery charger. When

fully

charged the

built-in

batteries

will

give

about

8 hours

continuous

operation before recharging

necessary.

The accuracy and

portability

the 2007

will

make

especially useful

for

measurements, alignment

trouble

shooting on a wide variety

radio

and

communications equipment, including transmitting and receiving

antennas. Its high selectivity, and good image and

rejection also makes

ideal

for

distortion

measurements.

CONTROLS

2.1. MEASUREMENT PROBE

AND

PROBE ACCESSORIES

;;;;;;;

50Q

BNC

Termination

(RZ 0006)

BNC

Connector

(JP

0029)

liiiiiiiiiiiiQ

Blunt

Nose

Test Prod

(JL 0029)

Needle Nose

Test Prod

(UR

0124)

,,.•.

;

--:-

;

~·

;

iiii

···-

60 dB

Attenuator

Blunt

Nose

(ZF 0003) Test Prod

(JL 0029)

Fig.2.1. Measurement Probe andprobe accessories

the

2007

MEASUREMENT

PROBE:

The Measurement Probe ZC 0009 con-

tains a high

input

impedance field

effect

transistor preamplifier

prevent load-

ing

the measurement source. The

input

the preamplifier

via a screw

thread

termination

on the body

the

probe and accepts the

range

probe

accessories shown in Fig.2.1.

allow

in situ measurements

carried

out

electronic apparatus the

output

the probe

via a 1.2 metre long screen-

cable, terminated

with

a BNC out-

put,

which

directly

fits

the PROBE

INPUTsocket

the 2007.

60 dB

ATTENUATOR:

TERMINATION:

WARNING.

The maximum

input

volt·

age

which may

handled

the

Measurement Probe

100

for

signal

frequencies ranging

from

100kHz

305 MHz, whilst at 50

60Hz

250

Volts

and at

500 V.

The

Attenuator

ZF 0003

for

attenuation

the

input

signal

the

Measurement Probe, thereby changing

the maximum

input

voltages marked

around the

VOLTAGE

RANGE switch

the 2007

from

Volts. The

input

the attenuator

a screw thread

termination which accepts the

range

probe accessories shown in Fig.2.1. The

attenuator push fits

onto

the

·body

the Measurement Probe when the screw

thread

input

termination

has

been

fitted

with

Blunt

Nose

Test Prod Type

0029

(see

Fig.2.1 ).

This

a 50 Q BNC Termination which

screws

directly

onto

the

input

the

Measurement Probe and the

Attenuator.

used

match the

input

the probe

Attenuator

50 Q measurement source.

WARNING.

When

usi~g

the 50 Q

Termination, the maximum

input

volt·

age

limited

3.5 Volts. This should

not

exceeded

the Termination

will

damaged.

22.

FRONT PANEL OF 2007

Input

Bandwidth

'!!'

-------._-Light

,.-------Frequen

cy Range

Tuning

Ref.

Voltage

Fig.2.2.

Front

panel

the

2007

AND

MODULATION

METER: A moving coil indicating meter

with

mirror

back

avoid parallax errors.

The meter

has

five

scales,

the functions

which

are

follows:

Voltage

scales.

These

are

situated

immediately above the

mirror

on the

meter. They

are

used

for

voltage

mea-

surements on

signals applied

the

input

the Measurement Probe when

the carrier modes

the METER and LS

switch

are

used.

scale. This

situated immediately

below the

mirror

and

used

in conjunc-

tion

with

the voltage

scales

when the

"carrier''

modes

the METER

AND

switch

are

employed. The

scale

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