communications lab manual

Printed in Canada

|3026866000511H~

Analog CommunicationsVolume 1

Instrumentation

Student Manual26866-00

Printed in Canada

|3026866000511H~

Analog CommunicationsVolume 1

Instrumentation

Student Manual26866-00

AB

ANALOG COMMUNICATIONSVOLUME 1

INSTRUMENTATION

bythe Staff

ofLab-Volt Ltd.

Copyright © 1990 Lab-Volt Ltd.

All rights reserved. No part of this publication may be reproduced,in any form or by any means, without the prior written permissionof Lab-Volt Quebec Ltd.

Legal Deposit – Fourth Trimester 1984

ISBN 2-89289-044-6

FOURTH EDITION, JUNE 1987

Printed in CanadaNovember 2005

Performing the Communications CoursewareUsing the Latest Versions of the Dual Function Generator

and True RMS Voltmeter / Power Meter

XI

A. Dual Function Generator, Model 9402-00 versus Model 9402-10

Completion of the exercises in this manual requires a Lab-Volt Dual FunctionGenerator, Model 9402-00 or 9402-10. These two models provide the same signals,but have different front panel controls. The manipulations in the hands-on exercisesof the Communications courseware have been written for the Model 9402-00 DualFunction Generator. If you perform the exercises using the Model 9402-10 DualFunction Generator, please take note of the following differences between the frontpanel controls of these two models of the Dual Function Generator (refer to Figures1 and 2 which show the front panels of the two models).

1. The display of the Model 9402-10 Dual Function Generator not only indicatesthe frequency of the signal produced by channel A or B (as on theModel 9402-00 Dual Function Generator), but also various settings related tothis channel.

2. The A and B channel-selection push buttons on Model 9402-00 are replacedwith a single A/B selection push button on Model 9402-10. The A/B selectionpush button allows selection between channels A and B of the Dual FunctionGenerator. The other channel is selected whenever the A/B button isdepressed. The function, frequency range, and attenuator settings of theselected channel are indicated in the display of the Model 9402-10 DualFunction Generator. When displayed, these settings can be modified using theFUNCTION, FREQUENCY RANGE, and ATTENUATOR push buttons

3. The sine-wave, square-wave, triangle-wave, sawtooth-wave, and pulseFUNCTION selection push buttons of channels A and B on Model 9402-00 arereplaced with a single FUNCTION selection push button on Model 9402-10, thatis common to both channels. The FUNCTION selection button is used inconjunction with the A/B channel selection push button to select the function ofeach channel. The function selected is indicated by a symbol in the display ofthe Model 9402-10 Dual Function Generator.

4. The 100-Hz, 1-kHz, 10-kHz, and 100-kHz FREQUENCY RANGE selection pushbuttons of channels A and B on Model 9402-00 are replaced with a singleFREQUENCY RANGE selection push button on Model 9402-10, that iscommon to both channels. The FREQUENCY RANGE selection button is usedin conjunction with the A/B channel selection push button to select thefrequency range of each channel. The frequency range selected is indicated inthe display of the Model 9402-10 Dual Function Generator.

5. The 0-dB, 20-dB, and 40-dB ATTENUATOR selection push buttons ofchannels A and B on Model 9402-00 are replaced with a single ATTENUATORselection push button on Model 9402-10, that is common to both channels. TheATTENUATOR selection button is used in conjunction with the A/B channelselection push button to select the attenuator of each channel. The attenuatorselected is indicated in the display of the Model 9402-10 Dual FunctionGenerator.

Performing the Communications CoursewareUsing the Latest Versions of the Dual Function Generator

and True RMS Voltmeter / Power Meter

XII

A

FUNCTION

B

A

B

MAX.MIN.

OUTPUTS

POWER

40

B

A

AHz

kHz

SYNC. / TTLOUTPUTS

A

HzFREQUENCY RANGE

FREQUENCY MODULATION

B

B

0

B

DEVIATION

BMAX.MIN.

INPUT

10 k1 k100

B

100 k

(CHANNEL A)A A A

ATTENUATORdB

MAX.MIN.

20

FREQUENCY

DUAL FUNCTION GENERATOR9402-00OUTPUT FREQUENCY

OUTPUT LEVEL

6. The control knobs used to set the durations of the pulse signals of channels Aand B are referred to as the PULSE DURATION control knobs on theModel 9402-10 Dual Function Generator.

7. Independent FREQUENCY and OUTPUT LEVEL control knobs for channels Aand B are still provided. However, their positions on the front panel havechanged.

8. When the frequency is set to 100.00 kHz or more, the display on theModel 9402-10 Dual Function Generator does not flash as is the case on theModel 9402-00 Dual Function Generator.

Figure 1. Front panel of the Dual Function Generator, Model 9402-00.

Performing the Communications CoursewareUsing the Latest Versions of the Dual Function Generator

and True RMS Voltmeter / Power Meter

XIII

DUAL FUNCTION GENERATOR9402-10

DURATION

B

A

B

AFREQUENCY

PULSE

MIN. MAX.

MIN. MAX.

MIN. MAX.

OUTPUT

A A

B B

FREQUENCY RANGE

ATTENUATORFUNCTION

A/B

POWER

LEVEL

(OUTPUT A)FREQUENCY MODULATION

DEVIATIONINPUT

OUTPUTSSYNC. / TTLOUTPUTS

B

A

SELECTS BETWEEN THESINE-WAVE, SQUARE-WAVE,

TRIANGLE-WAVE, SAWTOOTH-WAVEAND PULSE FUNCTIONS A OR B

CHANNELSELECTS

AND SETTINGS ASSOCIATEDWITH THE SELECTED CHANNEL

DISPLAYS THE FREQUENCYSELECTS BETWEENTHE 100-Hz, 1-kHz,

10-kHz, AND 100-kHzFREQUENCY RANGES

SELECTS BETWEENTHE 0-dB, 20-dB,

AND 40-dBATTENUATORS

CONTROLKNOBS

FREQUENCYDURATION

PULSE

CONTROLKNOBS

(CHANNELS A AND B) (CHANNELS A AND B)

CONTROLKNOBS

LEVELOUTPUT

(CHANNEL A)

DEVIATIONCONTROL KNOB

MODULATIONFREQUENCY

Figure 2. Front panel of the Dual Function Generator, Model 9402-10.

Performing the Communications CoursewareUsing the Latest Versions of the Dual Function Generator

and True RMS Voltmeter / Power Meter

XIV

SCALECHANGE

dBm

dBm27 7 13 33

RANGEmV

10 100V

1 10

MODEVOLTINPUT

1 Mæ

TRUE RMS VOLTMETER / POWER METER

[ 0 dBm = 1mW in 50 æ ]

9404-00

POWER

53

100

ZERO ADJUST

B. True RMS Voltmeter / Power Meter, Model 9404-00 versus Model 9404-10

Completion of the exercises in this manual requires a Lab-Volt True RMSVoltmeter / Power Meter, Model 9404-00 or 9404-10. These two models are verysimilar except for a few minor changes. The manipulations in the hands-onexercises of the Communications courseware have been written for theModel 9404-00 True RMS Voltmeter / Power Meter. If you perform the exercisesusing the Model 9404-10 True RMS Voltmeter / Power Meter, please take note ofthe following differences between these two models of the True RMS Voltmeter /Power Meter (refer to Figures 3 and 4 which show the front panels of the twomodels).

1. The 100 V (+53 dBm) range on the Model 9404-00 True RMS Voltmeter /Power Meter is not available on the Model 9404-10, True RMS Voltmeter /Power Meter. This range is not required to complete the hand-on exercises inthis manual.

2. A ZERO ADJUST knob is provided on the Model 9404-00 True RMS Voltmeter /Power Meter to manually zero the unit before taking measurements. There isno ZERO ADJUST knob on the Model 9404-10 True RMS Voltmeter / PowerMeter, because zero adjustment is performed automatically by the unit. An LEDon the front panel of the Model 9404-10 True RMS Voltmeter / Power Meterlights up whenever zero adjustment is performed.

Figure 3. Front Panel of the True RMS Voltmeter / Power Meter, Model 9404-00.

Performing the Communications CoursewareUsing the Latest Versions of the Dual Function Generator

and True RMS Voltmeter / Power Meter

XV

SCALECHANGE

ADJUSTINGZERO

POWER (dBm)

dBm27 7 13 33

RANGEmV

10 100V

1 10

MODEVOLTAGE (V)INPUT

1 Mæ

TRUE RMS VOLTMETER / POWER METER

[ 0 dBm = 1mW in 50 æ ]

9404-10

POWER

THE MAXIMUM RANGE IS10 V (+33 dBm) INSTEAD

OF 100 V (+53 dBm)LIGHTS UP WHENEVER ZERO

BY THE UNIT. THIS LED

ADJUSTMENT IS PERFORMED.

ZERO ADJUSTMENT IS NOWPERFORMED AUTOMATICALLY

Figure 4. Front Panel of the True RMS Voltmeter / Power Meter, Model 9404-10.

XVI

XVII

XVIII

ANALOG COMMUNICATIONS –VOLUME 1INSTRUMENTATION26866-00First Edition: June 1987Printed: November 2005

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