Marconi Instruments TF 2502 Manuale utente

TF-2502-Marconi-1.jpg

R.P.

11/78/E

Instruction Manual

No.

2.502

for

R.F.

Power

Meter

2502

•

rechnic~O

LLI::Jitcations

1969

MARCONI

INSTRUMENTS

LIMITED

ST. ALBANS HERTFORDSHIRE

ENGLAND

2502

lb-

11/74

Contents

Chapter 1 GENERAL

INFORMATION

Introduction

Data

summary

Accessories

Chapter 2 OPERATION

2. 1

General

...

2.2

Controls

·.

2.3

Connections

2.4.

Measurement

precautions

2.5

Making

power

measurements

2.6

Remote

operation

2. 7

Determination

modulation

depth

Decibel conversion

table

Chapter 3 TECHNICAL DESCRIPTION

3. 1

Circuit

analysis

...

3. 2

Detector

unit

Terminating

load

Chapter 4

MAINTENANCE

4. 1

General

. . . 15

Removal

and

replacement

components

. . . 16

Removal

terminating

load

and

detector

unit

Removal

monitor

front

panel16

Chapter 5 CALIBRATION

5. 1

Apparatus

required

5. 2

Preliminary

checks

5. 3

Standing

wave

ratio

5. 4

Calibration

accuracy

f. . 18

5. 5

Calibration

accuracy

f. 19

Chapter 6 REPLACEABLE PARTS

Introduction

and

ordering

Chapter 7 CIRCUIT DIAGRAMS

Circuit

notes

...

Fig.

Circuit

diagram

2502 (1)

General

information

1.1

INTRODUCTION

2502

a 50 Q

absorption

power

meter

for

measurements

from

1 GHz

ranges

of 3

Wand

10 W

full-scale.

one of a

series

similar

instru-

ments

having

different

power

ranges.

The

design

based

thin-film

and

microwave

techniques

and

employs

thermocouple

detector

series

with a

terminating

load.

Incident

power

sampled

tbe

detector

and

the

resultant

displayed

meter

calibrated

terms

totalincident

power.

This

method

gives

reading

true

mean

power

irrespective

waveform

and

makes

the

instrument

particularly

suitable

for

measurim:;

the

output

a.m.

pulse

transmitters.

socket

provided

allow

the

demodulated

signal

monitored

headphones

oscilloRcope.

The

disadvantage

the

long

time

constant

inherent

thennocouple

meter

overcome

the

provision

auxiliary

fast

response

diode

detector

with a

separate

small

meter.

This

allows

you

quickly

tune

source

under

test

for

maximum

output

before

measuring

its

power

level

the

main

meter.

Fig.

1.1

R.F.

Power

Meter

2502

(1)

The

instrument

consists

three

separable

items

detector

unit,

monitor

unit

and

terminating

load

and

requires

neither

batteries

nor

mains

supply.

Fig.

1.2

Terminating

load

8544

1.2 DATA SUMMARY

Frequency

range:

Power

ranges:

Accuracy:

Input

impedance:

V.S.W.R.:

Overload

capacity:

Detector

characteristics:

Output

facility:

Temperature

range:

Dimensions

and

weight:

Fig.

1.3

Detector

Unit

8723/2

GHz.

Wand

full-scale.

±5%

full-scale.

50 Q

via

type

socket.

Better

than

1:1.

20%

continuously.

50%

for

periods

(1)

Calibrated

thermocouple

giving

approximately

linear

power

scale.

(2)

Uncalibrated

fast

response

diode

detector

operating

down

MHz.

Jack

provided

for

monitoring

modulation.

+10

octo

+35

oc.

Height

1/8

(130

mm)

Width

5/8

(219

mm)

Depth

3/4

(121

mm)

Weight

3lb

(1.

4 kg)

2502 (1a)

1.3

ACCESSORIES

Supplied

Type

free

plug,

code

23443-708;

for

input.

Telephone

plug,

code

23421-610;

for

modulation

output.

Knurled

retaining

ring,

code

33265

-309R,

for

securing

input

connector

during

transit.

2502

(1) 5

Operation

2.1

GENERAL

The

power

meter

has

dual

readout

facilities

- a

large

meter

directly

calibrated

mean

power

and

small

meter

with

arbitrary

calibration

for

use

fast

response

tuning

indicator.

2.2

CONTROLS

MARCONI INSTRUMENTS

IJD

Fig.

2.1

Layout

controls

Type

N input

socket

accepts

inputs

60 V

peak.

Thermocouple

meter

shows

mean

power

load.

Near

linear

scales

0 to 3 W

and

10 W

are

selected

Range

switch.

Power

range

switch

selects

3 W

10 W

full-scale

WATTS

meter.

0 DIODE

DETECTOR

meter

provides

fast

response

tuning

indication

for

the

source

under

test.

Operates

down

5 MHz.

Scale

arbitrarily

engraved

from

100.

Sensitivity

control

adjusts

the

gain

the

diode

detector.

The

crescent

symbol

indicates

that

sensitivity

increases

clockwise.

6 2502

(1)

0 INSERT

PROBE

control

adjusts

the

input

the

diode

detector.

0 MOD OUT

jack

accepts

2-pole

telephone

plug

for

connection

oscilloscope

high

impedance

headphones

monitor

amplitude

modulation.

2.3

CONNECTIONS

0·223~

:!:

·009"

Fig.

2.2

Cross

section

type N

connector

(male)

showing

critical

dimension

knurled

retaining

ring

fitted

the

type N

connector

prevent

movement

the

detector

unit

during

transit.

Before

using

the

power

meter,

unscrew

this

ring

and

pull

off

the

plastic

cap

from

the

connector.

Keep

both

these

items

for

re-use

the

instrument

has

transported.

!cAUTION

I When

making

connection

the

input

socket

important

use

the

free

type

connector

supplied

accessory.

another

type N

connector

used

then

essential

ensure

good

reliable

mating.

achieve

this

the

inner

contact

depth,

the

distance

from

the

shoulder

the

interface

shown

Fig.

2. 2,

must

0.223

±0.009

(5.92

±0.23

mm)

conforming

Spec.

MIL-C-71B.

Type

numbers

coaxial

cables

suitable

for

use

with

the

plug

are

follows:

United

Kingdom:

Amphenol

No.

82-312

Joint

Services

5935-99-943-4155.

United

States:

Military

No.

UG-1185/U.

NOTE:

prevent

accidental

interchange

parts

with

those

other

instruments

the

series,

the

following

items

the

Power

Meter

2502

are

colour

coded

YELLOW.

addition

identification

labels,

bearing

the

same

serial

number,

are

fitted

each

the

units

which

make

the

complete

instrument.

(a)

The

plastic

cover

the

detector

unit.

2502 (1a) 7

(b)

The

catch

the

terminating

load.

(c)

The

plug

and

socket

the

cable

joining

thedetector

unit

and

the

monitor.

2.4

MEASUREMENT

PRECAUTIONS

When

malting

measurement,

the

following

points

should

borne

mind:

Ideally,

the

impedance

presented

the

power

meter

transmitter

under

test

should

purely

resistive.

practice,

the

power

meter

impedance

will,

inevitably,

include

small

reactive

component

which

will

reflected

back

into

the

transmitter

tuned

output

circuit,

partially

detuning

it.

order

obtain

true

measure

the

power

output

capabilities

transmitter,

its

output

stage

should

always

tuned

produce

maximum

indication

the

power

meter.

circumstances

where

the

power

meter

required

for

use

merely

terminating

device,

better

make

connection

directly

the

terminating

load

this

presents

particularly

high

quality

resistive

termination

having

about

04.

remove

the

load

for

this

purpose

see

Sect.

Because

the

time

lag

thermocouple

heating,

and

the

low

resistance

the

meter

circuit,

wait

a few

seconds

before

reading

the

power.

The

peak

voltage

that

can

applied

the

power

meter

limited

the

in-

line

detector

insulation;

this

rated

withstand

60 V

peak,

which

exceeds

the

peak

voltage

a 100%

sine

wave

amplitude

modulated

signal

10 W

mean

power.

the

event

long-term

storage

conditions

extreme

humidity,

check

calibration

before

use

(refer

Sect.

5. 4).

necessary,

dry

out

placing

the

power

meter

oven (+50

°C

to +70 °C)

for

least

one

hour.

2.5

MAKING

POWER

MEASUREMENTS

make

power

measurement

proceed

follows:

Set

the

Range

switch

suit

the

expected

power

level

the

source.

this

unknown,

use

the 10 W

position

precaution.

Turn

the

INSERT

PROBE

and

Sensitivity

controls

fully

counter-clockwise.

Connect

the

source

under

test

the

Input

socket

and

note

the

reading

the

DETECTOR

meter.

Bring

this

reading

about

half

scale

turning

the

Sensi-

tivity

control.

this

insufficient,

turn

the

INSERT

PROBE

control

clockwise.

NOTE:

the

probe

inserted

too

far,

the

instrument

may

increase.

not

insert

until

the

Sensitivity

control

maximum.

8 2502 (1a)

Tune

the

source

under

test

for

maximum

reading

the

DETECTOR

meter.

the

probe

was

inserted

(3)

above,

turn

the

INSERT

PROBE

control

back

its

fully

counter-clockwise

position.

Then

read

the

power

the

source

the

WATTS

meter.

2.6

REMOTE

OPERATION

the

power

meter

has

connected

directly

the

power

source

may

inconvenient

read

operate

the

instrument.

so,

may

better

use

with

the

detector

unit

and

load

detached

from

the

monitor

unit.

this,

pull

out

the

INSERT

PROBE

knob

disengage

the

dog

clutch,

depress

the

catch

the

ternunating

load

and

withdraw

the

load

and

detector

assembly

far

the

interconnecting

lead

will

allow.

Operation

the

same

Sect.

2. 5

except

that

probe

insertion

controlled

directly

the

slotted

knob

the

detector

unit.

2.7

DETERMINATION

MODULATION

DEPTH

The

depth

amplitude

modulation

signal

having a

sinusoidal

envelope

can

determined

follows:

Measure

the

output

power

the

source

under

test

with the

signal

unmodulated.

Let

this

reading

watts.

Modulate

the

signal

and

again

measure

the

output

power.

Let

this

reading

watts.

Calculate

the

modulation

depth.

This

can

evaluated

since

and

the

%modulation,

are

2502 (1a)

pm p c

(1 +

2)·

.................... (1)

Indice

Altri manuali Marconi Instruments Strumento di misura

Marconi Instruments

Marconi Instruments TF 2337A Manuale utente

Marconi Instruments

Marconi Instruments 933D Manuale utente

Marconi Instruments

Marconi Instruments 2382 Manuale utente

Marconi Instruments

Marconi Instruments tf2603 Manuale utente

Marconi Instruments

Marconi Instruments TF 2005R Manuale utente

Manuali Strumento di misura popolari di altre marche

Suaoki

Suaoki D40 Manuale utente

Elster

Elster BK-G1.6 Manuale utente

Endress+Hauser

Endress+Hauser Deltabar FMD71 Manuale

Duratool

Duratool D03128 Manuale utente

Vega

Vega VEGAPULS 65 Manuale utente

Tonghui

Tonghui TH2618B Manuale utente

Tenmars

Tenmars TM-801 Manuale utente

MSR

MSR 145 Manuale utente

TPS

TPS WP-82 Manuale utente

ELMETRON

ELMETRON CP-511 Manuale utente

PCB Piezotronics

PCB Piezotronics 003C30 Manuale utente

Tenma

Tenma 72-10465 Manuale utente

Endress+Hauser

Endress+Hauser Proline Promag 50 Specifiche tecniche

Siemens

Siemens SITRANS F Coriolis FCT030 Manuale elenco delle parti

KLINGER

KLINGER CMF V Series Manuale utente

EXFO

EXFO FTB-2 Manuale operativo e di manutenzione

Keysight

Keysight M8290A Manuale utente

ADTEK

ADTEK MW-5 Manuale utente