HP 4935A Service manual

Download

Errata

4935A Operating & Service Manual

04935-90029

November 1966

Title & Document Type:

Manual Part Number:

Revision Date:

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that HewlettPackard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A.

About this Manual

We’ve added this manual to the Agilent website in an effort to help you support your product. This manual provides the best information we could find. It may be incomplete or contain dated information, and the scan quality may not be idea l. If we find a better copy in the future, we will add it to the Agilent website.

Support for Your Product

Agilent no longer sells or supports this product. You will find any other available product information on the Agilent Test & Measurement website:

www.tm.agilent.com

Search for the model number of this product, and the resulting product page will guide you to any available information. Our service centers may be able to perform calibration if no repair parts are needed, but no other support from Agilent is available.

Operating and Service Manual

HP 4935A

Transmission Impairment

Measuring Set

Serial Numbers

This manual applies to instruments with serial numbers prefixed:

:2846A

5070

Centennial Blvd., P.O. Box

Manual Part No: 04935-90029 Microfiche Part No: 0493598804

Co./Colorado

7050,

Telecommunications Division 1987

Colorado Springs, Colorado 80933

Printed Nov.

Printed in U.S.A.

1966

Warnirlgs/(:autions

[

WARNING

SAFETY GROUNDING

Model

4YXA

If this instrument is to be energized via an autotransformer

for voltage reduction, make sure the common terminal is

connected to the earthed pole of the power source.

BEFORE SWITCHING ON THIS INSTRUMENT, the

protective earth terrninals of this instrument must be

connected to the protective conductor of the (mains)

power cord. The rnains plug shall only be inserted in a

socket outlet provided with a protective earth contact. The

protective extension cord (power cable) without a protective conductor (grounding).

Make sure that only fuses with the required rated current and of the specified type (normal blow, time delay, etc.) are used for replacement. The use of repaired fuses and the short-circuiting of fuse holders must be avoided.

Whenever It is likely that the protection offered by fuses has been impaired, the instrument must be made inoperative and be secured against any unintended operation.

actlon

must not be negated by use of an

Any interruption of the protective (grounding) conductor (inside or outside the instrument) or disconnecting the protective earth terminal can

dangerous. Intentional interruption is prohibited.

make this instrument

HIGH VOLTAGE

Any adjustment, maintenance, and repair of the opened instrument under voltage should be avoided as much as possible and, when inevitable, should be carried out only by

a skilled person who is aware of the hazard involved.

Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of

SUPPlY.

Adjustments and service described herein are performed with power supplied to the instrument while protective covers are removed. Energy available at many points, if contacted, result in personal injury.

LINE VOLTAGE

BEFORE SWITCHING ON THIS INSTRUMENT, make

sure instrument requirements match the voltage of the

power source.

GROUNDING

BEFORE SWITCHING ON THIS INSTRUMENT, ensure that all devices connected to this instrument are connected to the protective (earth) ground.

BEFORE SWITCHING ON THIS INSTRUMENT, ensure that the line power (mains) plug is connected to a three-conductor line power outlet that has a protective

(earth) ground. (Grounding one conductor of a

conductor outlet is not sufficient.)

two-

Model

&%A

IEC Symbols

IEC SYMBOLS

The

follownq IS rl 1151

are normally be placed on removable parts likely to be detached or lost.

---

applwd adlacent

of key I EC symbols used by Hewlett-Packard. All symbols

to the device

lnstrucf~on

apparatus

the

wth thlssymbol (IEC 348;16a).

Termnal dewces

may be dangerous when those

volrdge

Earth

earth

348.18a).

AC current

DC current

AC or DC current (I EC 1 17-l. symbol No.

pletely or partly omitted if there II no ambiguity. If the hatching is shall be

Ampere

Volt

Voltampere (I

Watt (I EC 1174, symbol No.

Manual symbol: If necessary. to preserve the

from damage !t IS necessary for the user to refer to

mstruct~on

dewces

shall be marked

exceeds 1 KV: The flash shall be red

Termunals. If

termmal 1s

modlfled.

for example, by

(IEC

fIEC

Frame or chaws

omated,

thrcker (I

(IEC

lltC

1174. symbol No. 357).

requur~ng

the symbol. They shall not

manual, then shall the apparatus be marked

fad from the

the use of this symbol for the

not

permttted

117-l. symbol No.

connection.

the line representing the

1174, symbol No. 356).

EC 1174, symbol No. 358).

connecting

117.1,

symbol No. 87).

~ntertor

wth

bang

The

3601.

National

by live voltages that

to or

dlsconnectlng

the flash shown when the

Standards, it may

placed

irwde

3).

2).

8).

hatchmg

may be com-

frame

from

(IEC 348;lEc).

protectwe

circle (IEC

or chassis

addltlon

in HP Automatic Test System Manuals.

Warnings, cautions and notes.

to which each apples but notes may precede or follow applicable text depending on the

material

procedural steps nor shall they be numbered. When a

consists

of shall not be repeated above each paragraph. If it is ever necessary to precede a paragraph by both a appear m the sequence as noted, namely.

I”

the text shall be short and concise and be used to emphasize important and

critical mstructtons.

Hertz

(IEC

1174.

symbol

No. 365).

Contactor, normally closed. In order to the symbol for a horizontal (as drawn here) lines should be at least equal to the length of those

the following

two

correctly

loss of life.

An operating procedure, strictly observed, could result tn damage to, or

destruction of,

NOTE: An operating procedure,

describes

(All) Warmngs

to be

highllghted. Warnings, cautions,

or more paragraphs, the

warmng

and a note, or a

operating

procedure,

followed, could result

eqwpment.

is essential to

hIghlIght.

lines (IEC 117-3,

the use of

practtce.

practw,

capacitor.

the

deance

symbol No. 215.21.

Warmngs.

Cautions and Notes used

and

caut!ons

shall precede the text

and notes shall not

heading

warnings. cautions,

warmng,

WARNING, CAUTION, NOTE,

caution

and a note, etc. they shall

etc.

which. If

III

personal injury or

etc. which, if not

condmon,

etc.

avold

confusion with between the

contan

caution, or note

notes. Such inserts

not

whwzh

VAh

Watthour (I

Voltamperehour (IEC

EC 1174, symbol No.

361).

1174, symbol No. 362).

-health

hazards precaution data.

factors, in the environment or use of the

,tppropriate

precautionary requirements shall be

(All)

When hazardous chemicals or adverse health

equipment

cannot be eliminated,

mcluded.

iii/(iv blank)

Model 4935A Table of Contents

TABLE OF

Section Title

I. GENERAL INFORMATION

l-l. Introduction.. ................................................... l-l

l-3. General l-5. Instrument Identification..

l-7. Specifications.. .................................................

l-9.

Safety

Related Manuals............................................. l-4

1-12.

1-14. User Repair.. ...................................................

1-16.

Options

1-19.

Warranty.. ......................................................

1-21.

Recommended Test Equipment.. .................

l-23. Battery Operation

l-26. Charging the Batteries.. ...........................

l-29. Operating Temperature.. .........................

II. INSTALLATION

2-l. Introduction.. ..................................................

2-3. Initial Inspection.. ..........................................

2-6. Preparation for Use.......................................

2-7. Power Requirements.. ...................................

2-9. Line Voltage Selection..

2-11. Power Cable.. .................................................

2-13. Operating Environment.. ..............................

2-16. Storage 2-17.

Instrument Packaging ................................... .2-2

2-19.

III. OPERATION

3-l. Introduction....................................................

3-3. Self Check.......................................................

3-5. Error

3-7. Operating 3-9. Measurements

3-10. Measurement Principles ............................... .3-17

3-12. Input-Output 3-19. Level and Frequency Measurements..

1000

3-21. 3-24. Frequency Shift

3-26. Attenuation Distortion.. ................................

3-30. SF Skip ............................................................

Message Circuit Noise Measurements..

3-32.

3.40. Noise Measurements.....................................

3-42. Noise-with-Tone (Notched Noise) 3-45. Signal-to

Description.. ..................................... l-l

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

Considerations..

and Accessories..

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

.............................. l-4

(0pt.s 001 &

003) ..........

................................. 2-l

and

Shipment.. .................................

Environment..

Messages..

........................................... .2-2

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

Instructions

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

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

Switching ................................ .3-17

Hz Loss.. ................................................

.............................................. .3-18

...............3-22

Noise Measurement.. .................... .3-22

........

....

C:ONTENTS

Page Section Title

3-48. Signal Frequency Interference .................... .3-24

3-52. Impulse Noise.. .............................................. .3-24

3-55. Noise-to-Ground Measurement..

l-1

l-l

.1-4

l-4

..l-

4 l-4 l-6 l-6 l-6

.2-l .2-l .2-l .2-l

.2-2 .2-2 .2-2

.3-l .3-l .3-l

.3-6 .3-7

.3-18 .3-18

.3-18 .3-19

..3-19

.3-22

3-59. Peak-to-Average Ratio

IV. PERFORMANCE TESTS

4-l. Introduction ...................................................

4-3. Equipment Required.. ..................................

4-5. Test

Record

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

4-7. Self Check ......................................................

4-9. Performance Verification.. ...........................

4-12. Performance Tests........................................

4-13. Transmitter Flatness at + 4-14. Transmitter 4-15. Receiver Accuracy at t

& -4OdBm..

4-16. Autorange Test........................................

4-17. Filter Tests.. 4-18.

Impulse Noise DAC Test.. .....................

4-19. Count Limit Test.. ...................................

4-20.

Termination Impedance 4-21. Hold Tone Dropout Detector 4-22. 4-23. Distortion 4-24. P/AR

Hold Circuit Test

Test

Test..

4-25. Noise-to-Ground(Std. dc Opt. 001).

V. ADJUSTMENTS/CALIBRATIONS

5-l. Introduction ...................................................

5-3.

Safety

Considerations.. .................................

5-5. Equipment 5-6. Instrument 5-9. Adjustment

Required.. ..................................

Access..

Locations...................................

5-11. Adjustments.. .................................................

5-13. t

5V,

Supply

14V,

and

Adjustments

5-14. Output Level & Transmit

Monitor

Loop Adjustments.. .................

5-15. Receiver Adjustments...................................

5-17. Notch Filter Adjustments.............................

5-18. Al3 P/AR Filter and Latch

Adjustments(0pt.s

5-19. Hold Circuit Adjustments.. ....................

Measurement.........3-2

Flatness at

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

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

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

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

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

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

-14V

Power

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

001&003). ...................

................ .3-25

10dBm..

-40dBm..

1ldBm

Test..

Test........4-19

........

..........

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

......

Page

.4-l .4-l .4-l .4-l .4-l .4-2 .4-2 .4-4

.4-8 .4-10 .4-11 .4-14

.4-16

.4-17

.4-20

.4-21

.4-25

.4-26

.5-l .5-l .5-l .5-l

.5-l .5-2

.5-3

.5-4

.5-5

.5-7

.5-8

.5-9

Table of Contents Model

4935A

TABLE OF CONTENTS

Section

VI. REPLACEABLE PARTS

6-l. Introduction..

6-3. Replaceable Parts List.. ...............................

6-5. Ordering Information ...................................

VII. MANUAL CHANGES

7-1. Introduction ....................................................

7-3. Manual Changes.. ..........................................

7-6. Manual Change Instructions.......................... 7-l

VIII. SERVICE

8-l. General Information ....................................

8-8. How Measurements are Made 8-10. Level

8-13. Noise.. ......................................................... 8-4

8-16. Noise-with-Tone ......................................

8-19. Signal-to-Noise.. .......................................

8-22. Impulse Noise ..........................................

8-26. Noise-to-Ground (Std & Opt. 001). 8-29. Peak-to-Average Ratio: P/AR

(0pt.s

8-32. Frequency Measurement.. ............................

8-34. Level

Measurement..

8-38. How to Compute Frequency and Level

Measurement .................................................

8-39. Level Calculation Example.. ...................

8-42. Control Theory of Operation.......................

8-44. MicroprocessortoInstrument.. ................... .8-11

8-45.

System

8-48. InstrumenttoMicroprocessor.. ................... .8-12

8-51. Operator to Microprocessor ........................ .8-12

8-52. 8-54.

Keyboard Interrupt.. ................................ .8-12

Receiver Impedance

8-57. MicroprocessortoOperator.. ......................

8-58. Displays..................................................... .8-13

8-60.

InstrumenttoOperator ................................ .8-13

8-62. Monitor Amp ........................................... .8-13

8-64. Beep Generator ....................................... .8-13

8-66. OperatortoInstrument ................................ .8-13

8-68. Miscellaneous Circuitry................................ .8-13

8-73. Receiver Theory of Operation..................... .8-15

8-76.

I/O

Termination ..............................................

Title Page Section Title

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

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

and

Frequency.. .............................

......

002&003) ....................................

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

Latches.........................................

Switches..

.............. .8-12

Switching/Hold Circuits/

.6-l

..6- 1

.6-l

.7-l .7-l

..8- 1

.8-3 .8-4

.8-4

.8-5

.8-5 .8-6

.a-6

.8-6

.8-7

.8-8

.8-11

.8-H

.8-13

.a-16

(cord)

Page

8-80. Input Select/Notch Filter/

25dBAmp.. ............................................. .8-17

8-85.

8-97. Level Detectors ....................................... .8-19

8-100.

8-102.

8-104.

811.3.

8-126. Power Supply Theory....................................

8-128. AC Line Supplies ....................................

8-131. Regulators.. ..............................................

8-139. Charger Board Theory of Operation..

8-141. Battery Charging.. ...................................

8-144. Power Source Selection.. ........................

8-146. Relay Drive Circuitry.. ............................

8-148. Inhibit Circuit ........................................... 8-26

8-153. Maintenance ..................................................

8-1.55.

8- 157.

8-159. Component Replacement ......................

8-164. Soldering ..................................................

8-166

8-168. Disassembly .................................................... 8-29

8-169.

8-171.

8-173. Switchboard/Front Panel Removal..

8-175. Transmitter Board Removal.. ...................... .8-30

8-177. Reassembly.. ..................................................

8-179. Power Supply Troubleshooting.. .................

8-181. Minimum Core Troubleshooting................

8-183. Procedure .................................................. 8-35

8-186. Display Troubleshooting.. ......................

8-189. Control Troubleshooting..............................

8-190.

8-192. Control and Counting Section

8-194. Transmitter Troubleshooting ......................

8-196.

8-200.

8-202.

8-204. Filter and Signal Select Circuitry..

8-207. 8-210.

8-212. Receiver Troubleshooting............................

Noise Filter Circuitry.. ............................ .8-17

Impulse Noise Detectors.. ...................... .8-19

Transmitter .................................................... .8-19

Test Signal

Generation Method..

..........

.8-20

Circuit Description.. ................................ .8-21

.8-23 .8-23

.8-24

........

.8-25 .8-26 .8-26

.8-26

.8-28

Periodic Maintenance.. ........................... .8-28

Failure Maintenance.. .............................

.8-28

.8-28 .8-28

Cleaning.. ..................................................

Remove Case.. .........................................

.8-28

.8-29

Receiver Board/Shield Plate/

Battery Charger Board Disassembly..

........

..........

.8-29 .8-30

.8-31 .8-33 .8-34

.8-36

Troubleshoot

Interrupt Circuitry.. .................................

Keyscan/

.8-36

Troubleshooting.. .......................................... .8-36

.8-37

Transmit Clock Generator.. ...................

.8-37

Transmitter Signature Analysis

Procedure.. ...............................................

Digital-to-Analog Conversion ...............

Output Amplifier.. ...................................

Transmit Monitor.. ..................................

........

.8-37

.8-39

.8-40

.8-42

.8-43

Model 4935A

Table of Contents

TABLE OF CONTENTS

Section Title Page Section Title Page

8-217. 8-219.

8-222.

8-225.

8-227. 8-229.

8-232.

8-233.

8-235.

8-237.

8-239.

8-242.

8-246. Noise Filters ...................................................

8-248. Autorange ................................................. .8-49

8-250. Detector Troubleshooting.. ....................

8-252. Impulse Noise Circuitry.. ..............................

82.54.

8-255. Procedure .................................................

8-257.

Setup..........................................................

Overall Transmit Monitor

Transmit Monitor Signal ........................

Noise Filter.. .............................................

Simplified Autorange Check.. ................

Detector Select.........................................

Inputs from Front Panel/ Notch Filter/ 25dB Amp/Tone

Dropout Signal Path.. ..............................

Setup..........................................................

Input Transformer.. .................................

Noise-to-Ground Input Path

(Noise-to-Ground Units Tone Dropout

Notch Filter ..............................................

Charger Board Troubleshooting .................

Charge Circuitry/Charge

Inhibit Circuitry .......................................

Signal

Test

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

only)

............... .8-48

Path...................... .8-49

.8-44 .8-44

.8-45

.8-45 .8-46 .8-47

.8-47

.8-48

.8-49

.8-50

.8-52

8-259. Relay Drive Circuitry,

Low Voltage Inhibit Circuitry.. .............

8-261.

8-263. Delay and Relay Drive Circuitry.. 8-265. AC and Low Voltage Inhibit

8-267. Service Aids ...................................................

8-268. Service Selection of Input/

8-270.

8-272. Service Selection of Noise Filters

8-274. Procedure .................................................

8-276. Service Selection of Autorange

8-278. Procedure ................................................. .8-58

8-279. Hand Selection of

8-282. Hand Selection of C57 and 8-283.

Inhibit Circuitry AC and

Low Voltage.. ...........................................

Troubleshooting ......................................

Notch

Filter/25dB

Procedure.. ...............................................

Hand.. ........................................................

Gain for Service.............................................

(A3C57

for Desired Frequency

FiIters:

and

Response of Each Stage.. ................

Amp.. .............................

AX57

and

A3C160

for P/AR Units)

Response..

A3C160

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

Cl60..

.........

........

.8-53

.8-54 .8-54

.8-55 .8-57

.8-57 .8-57

.8-58 .8-58

.8-58

.8-59 .8-60 .8-60

vii

Table of

Contents

Model 4935A

LIST OF ILLUSTRATIONS

Section

l-l.

Model

4935A Transmission Impairment

Measuring

Title Page Section

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

Set

.1-O

l-2. Charge Acceptance at Various

Tempcraturcs..

2-l.

Lint

Voltage Selection.. ................................

3-l. Front and

Connectors/indicators..

3-2.

Measurements

3-3. Input-Output Switching

3-4. Level and Frequency Mcasurcments.. ........

3-5. Message Circuit Noise

3-6. C-Mcssagc Weighting Characteristic.. ........

3-7. 3

kHz

Flat Weighting Characteristic..

................................................ l-6

Rear

Panel Controls/

................................ .3-2

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

................................. 3-17

Measurements

......

.........

.2-l

.3-6

.3-18

..3-19

.3-20

3-8. Program Weighted liltcr.. ............................. .3-21

3-9.

kHz

3-10.

Flat Filter ..........................................

SOkBit Filter.

................................................... .3-22

.3-21

3-11. C-Message Weighting with Notch

Characteristic.. ............................................... .3-23

3-12. Signal-to-Noise Measurement ..................... .3-23

3-13. Impulse Noise Waveform

Rcprcscntation..

3-14. Noise-to-Ground

Circuit Noise

............................................. .3-24

Message

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

.3-2.5

3-15. P/AR Transmit Signal Frcqucncy

Spectrum.. ....................................................... .3-26

3-16. P/AR Transmit Signal

Envelope..

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

.3-26

4-l. Transmitter Flatness Test

at + 10

4-2.

Transmitter

-40 dBm

4-3. Reccivcr Test at + 11

and

-40 4-4. Autorangc 4-5. Filter 4-6. Impulse Noise 4-7. Count Limit 4-8.

Termination

4-9. Hold

4-10. Hold 4-11. Distortion 4-12. -40

dBm

4-13. Filter Circuits .................................................

4-14. P/AR Test.. ....................................................

.................................................... .4-2

dBm

Flatness Test

...................................................... .4-4

dBm

................................................... .4-8

Test

.............................................. .4-10

Tests..

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

DAC

Test

............................. .4-14

Test

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

Impedance Test.. ..................... .4-17

Tone (Xrcuit

Dropout

‘Test..

Test

Detector Test..

......................................... .4-20

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

...........

Distortion Test.. ............................. .4-22

.4-11

.4-16

.4-19

.4-23 .4-25

4-15. Noise-to-Ground Test.. ................................. .4-26

4-21

Title Page

5-1. Output Level and Transmit Monitor

Loop Adjustments..

5-2. Receiver

Adjustments...................................

5-3. Hold Circuit Adjustments..

6-l. Exploded View Case and Covers..

6-2. Exploded

View

6-3. Exploded View Battery Option..

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

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

...............6-4

Assemblies and Cables..

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

7-l. A2 Switch Board Component Locator..

....

.5-4 .5-5

.5-9

..6- 5

.6-7

..7-10

7-2. A5 Charger Board Component Locator.....7-14

7-3. Partial A5 Charger Board Schematic..

.......

.7-14

7-4. Al4 Transmitter Board Component

Locator ........................................................... .7-15

7-5. Partial A4 and Al4 Schematic ...................... 7-16

7-6. Al4 P/AR Transmitter Board

Component Locator.. ....................................

7-7. A4 Transmitter Board

Locator

........................................................... .7-17

Component

7-8. Partial Power Supply Schematic.. ................

.7-16

.7-18

7-9. Al3 P/AR Receiver Board Component

Locator ........................................................... .7-19

7-10. A3 Receiver Board Component

Locator ........................................................... .7-20

7-11.

A3 Receiver Board Schematic

(Sheet

of 2) ................................................. .7-21

7-12. A3 Receiver Board Schematic

(Sheet 2 of 2) ................................................. .7-23

7-13. Al3 P/AR Receiver Board Component

Locator

........................................................... .7-25

7-14. A3 Receiver Board Component

Locator

........................................................... .7-26

7-15. A3 Receiver Board Schematic

Diagram (Partial). .........................................

.7-27

7-16. A4 Transmitter Board Component

Locator ........................................................... .7-28

7-17. Al4 Transmitter Board Component

Locator

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

.7-28

7-18. A4 Transmitter Board Schematic

Diagram

......................................................... .7-29

7-19. Al4 Transmitter Board Schematic

Diagram (Partial). ......................................... .7-30

7-20. Al4 Transmitter Board Schematic

Diagram (Partial). ......................................... .7-30

.......

........

.7-32 .7-33

7-21. A2 Switchboard Component Locator.. 7-22. A2 Switchboard Schematic Diagram.. 7-23. A3 Receiver Board

Component

. . .

Model 4935A

Table of Contents

LIST OF ILLUSTRATIONS

Section Title Page Section

Locator.. .......................................................... .7-34

7-24. Al3 Receiver Board Component

Locator.. ..........................................................

7-25. Receiver Board Schematic

Diagram (Sheet1of 2) ................................. .7-36

7-26. Receiver Board Schematic

Diagram (Sheet 2 of 2) ................................. .7-37

7-27. A4 Transmitter Board Component

Locator.. .......................................................... .7-38

.7-35

8-19. P/AR Signal Frequency Spectrum ..............8-41

8-20. P/AR Transmit Signal Envelope................

8-21. 20 Hz Waveform ...........................................

8-22. Transmit Monitor Test Output ...................

8-23. 4935A Signal

8-24. Al Front Panel Schematic Diagram............8-69

8-25. A2 Switchboard Component Locator.. 8-26. A2 Switchboard Schematic Diagram.. 8-27. A3 Receiver Board Component

7-28. Al4 Transmitter Board Component

Locator

............................................................ .7-39

8-28. Al3 Receiver Board Component

7-29. A4 Transmitter Board Schematic

Diagram (Sheet 1 of 2) ................................. .7-40

8-29. A3 Receiver Board Schematic

7-30. A4 Transmitter Board Schematic

Diagram (Sheet 2 of 2)

7-31. A5 Charger Board Component

7-32. A5 Charger Board Schematic

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

Locator......7-4

Diagram.......7-4

8-l. 4935A Main Block Diagram.. .......................

.7-41

.8-l

8-30. A3 Receiver Board Schematic

8-31. A3 Receiver Board Schematic

8-32. A3 Receiver Board Schematic

8-2. Voltage-to-Frequency Conversion

Characteristics ................................................. 8-7

8-33. A4 Transmitter Board Component

8-3. Voltage-to-Frequency Conversion

output .............................................................

.8-8

8-34. Al4 Transmitter Board Component

8-4. Frequency and Level Measurement

Timing.. ...........................................................

.8-9

8-35. A4 Transmitter Board Schematic

8-5. Control Circuitry Block Diagram................ .8-11

8-6. Receiver Block Diagram.. .............................

8-7. Switchboard Block Diagram ........................

8-8. Input-Output Switching ................................

.8-14

.8-15 .8-16

8-36. A4 Transmitter Board Schematic

8-37. A4 Transmitter Board Schematic

8-9. Filter Block Diagram .................................... .8-17

8-10. Autorange Block Diagram ........................... .8-18

8-38. A4 Transmitter Board Schematic

8-11. Stair-Step Sinewave.. ..................................... .8-20

8-12. Transmitter Block Diagram ......................... .8-21

8-13. Power Supply Block Diagram.. ....................

.8-23

8-14. Charger Board Block Diagram.. .................. .8-25

8-17. Instrument Troubleshooting ........................

8-18. Stair-Step Sinewave.. .....................................

.8-32

.8-39

8-39. A4 Transmitter Board Schematic

8-40.

8-41. A5 Charger Board Schematic Diagram......8-9 1

Title Page

.8-42 .8-43 .8-44

Flow

Block Diagram.. ...........

Locator ...........................................................

Diagram (Sheet1of 4). ................................

Diagram (Sheet 2 of 4).................................

Diagram (Sheet3of 4).................................

Diagram (Sheet 4 of4). ................................

.......

........

.8-67

.8-70 .8-71

.8-72

.8-73

.8-75

.8-77

.8-79

Locator ........................................................... .8-80

Diagram (Sheet1of 5)................................. .8-81

Diagram (Sheet2of 5). ................................

Diagram (Sheet3of 5).................................

Diagram (Sheet 4 of 5). ................................

Diagram (Sheet5of 5). ................................

.8-83

.8-85

.8-87

.8-89

A5 Charger Board Component Locator....,890

Table of Contents

LIST OF TABLES

Model

4935A

Table

l-l. l-2. l-3.

2-l.

4-1. 4-2. 4-3. 4-4. 4-5.

4-6. 4-7. 4-8.

4-9. 4-10. 4-11. 4-12. 4-13. 4-14.

4-15. 4-16.

6-l.

6-2.

6-3.

Title Page Table

Specificalions..

Recommended

................................................. l-2

Test

Equipment.. ................. l-5

List of Parts Used for Performance Tests

................................................................. l-5

HP Plug

Transmitter Flatness

Transmitter Flatnessat-40 dBm..

Styles..

............................................... 2-3

at +

dBm

............... .4-3

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

.4-5

Abbreviated Transmitter Flatness................4-7

Receiver

Accuracy Test

Table ..................... .4-9

Abbreviated Receiver Accuracy Test

Table.. ..................................................... .4-9

Autorange

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

Test

.4-10

C-Message Filter Test................................... .4-11

kHz

Filter Test............................................ .4-12

khz flat Filter Test.. .................................. .4-12

Program Filter Test....................................... .4-12

kBit

Filter Test.. ........................................ .4-13

Test..

Notch Filter Impulse Noise Filter Circuit

.......................................... .4-13

DAC Test ............................. .4-15

Parts List.. ............................... .4-23

Abbreviated Distortion Test ........................ .4-24

P/AR Filter

Responses

................................ .4-25

Reference Designation and Abbreviations

Manufacturer

Replaceable

................................................. .6-2

Code List

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

Parts.. ........................................

.6-8

.6-9

Title Page

7-l. Manual Changes.. ..........................................

8-l. Measurements 8-2. Noise Amplification..

Summary.. ............................

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

.7-l

.8-3

8-5

8-3. Reference Signatures.. .................................. .8-38

8-4.

Wideband

8-5. 5

kHz

8-6. Output Select MUX.. ....................................

8-7. Transmit Monitor Test.................................

8-8.

A3UlB

8-9. TP3 Voltages

S-10.

Hand Selection of Noise Filters ..................

8-11. Autorange 8-12. Hand Selection of C57 and 8-13. 4935A C-Message 8-14. 4935A 3 8-15. 4935A

Filter Response ...........................

Low Pass Filter Response

.................8-40

Voltages ...........................................

................................................. .8-51

States........................................... .8-59

Cl60..

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

Filter..

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

kHz

Filter.. ...................................... .8-61

kHz

Filter...................................... .8-61

S-40

.8-41 .8-43 .8-51

.8-58

.8-60 .8-61

8-16. 4935A Program Filter.. ................................. .8-61

8-17. 4935A 50 8-18. 4935A

kBit

Filter.. .................................... .8-62

Notch

Filter.. ...................................... .8-62

8-19. 4935A P/AR Filter ....................................... .8-62

8-20. 4935A 150 8-21. 4935A 110 8-22. Bell 8-23. Bell 410093kHz 8-24. Bell 4100915kHz 8-25. Bell 41009 8-26. Bell 41009 8-27. Bell 41009 8-28. Bell 41009 Notch

kHz

Low Pass Filter ..................

kHz

Low Pass Filter

C-Message Filter.. ......................

41009

Filter.................................

Filter.. .............................

Program Filter.. .......................... .8-64

kBit

Filter.. ............................. .8-65

P/AR Filter ................................

Filter.. ...............................

.8-62

.................. .8-63

.8-63 .8-64 .8-64

.8-65 .8-65

/(xi blank)

(hctral Inii,rmi,ti~,,,

Model 4935A

Figure f-1.

Model

4935A f

ransnhdon

Impairment

Measuring set

Model 4935A. t

General Information

SECTION I

GENERAL INFORMATION

l-l.

1-2.

the HI’ Model

49XA

following information:

INTRODUCTION

This Operating and Service manual contains information to install, operate, maintain, and service

49:{5A

Transmission Impairment Measuring Set (TIMS). Figure 1-l shows the HP Model

with cover and power cord. The manual is divided into eight major sections which provide the

SECTION I. GENERAL INFORMATION. Provides identification, specifications, related manuals, and user-repair information.

SECTION II. INSTALLATION. Contains unpacking and inspection information, power requirements, packaging, and storage instructions.

SECTION III. OPERATION. Includes an explanation of controls, connectors, indicators, and an automatic self check procedure. Describes measurement principles and front panel instructions for

making each measurement.

SFCTION

instrument’s performance is in accordance with the specifications. SECTION V. ADJUSTMENTS. Provides adjustment and calibration procedures. SECTION VI.

replaceable parts.

SEXTION

instruments with earlier serial numbers.

IV. PERFORMANCE TESTS. C’xtves

REPLACEARLE

VII. MANUAL CHANGES. C

PARTS. Lists and identifies the instrument assemblies and

ams

test procedures required to verify that the

information to backdate the manual fort

SECTION VIII. SERVICE. Includes theory of operation, troubleshooting procedures, flowcharts, component locators, and schematic diagrams.

1-3.

l-4.

data and voice impairments. The frequency range over which measurements are made is 20 Hz to 110 kHz, in steps of I, 10, 100, 1000, or 10,000 Hz. There are four permanently stored, fixed frequencies -404, 1004,

2804. and

1-5.

l-6. A IO character serial number (OOOOAOOOOO) is inscribed on the rear panel. The first four digits and the letter are the serial prefix. The serial prefix will change only if changes are made to the instrument; a Manual Change Sheet will be included with the manuals of any instruments affected. form the serial suffix which is unique to each instrument.

1-7.

l-8. Instrument specifications are listed in Table I -1.

GENERAL DESCRIPTION

HI’ Model

271:s

49XA

is a Transmission Impairment Measuring Set (TIMS) which measures wideband

Hz. Any other four frequencies may be temporarily assigned and stored by the user.

INSTRUMENT IDENTIFICATION

Thelast

SPECIFICATIONS

five numbers

l-l

Table l-l. Specifications

Model

49:EA

TRANSMITTER

Frequency

Frequency Range . . . . . . . . .

Resolution Accuracy

20-99,999

100-l 10

Store and Recall Functions SK Skip . . . At power up skips a band from 2450-2750 HZ

Frequencies . . . . . At power up Fl is 404 HZ

Level

Range . . . . . . . . . . . . . . . .-40 to

Resolution . . . . . . . . . . . . . . . . . . . . . 0.1

Flatness . . . . . . . . . . . . . . . . . _ . . . . . . . _ (in

z+13

+im

g;+1;

kHz

20 200

-40

10 Hz

FREQUENCY, Hz

15k

f .005%

t .012%

60k 85k

.20

Hz to 110

of output frequency 20-9.999 Hz 1 Hz of output frequency 10-110

F2 is 1004 Hz F3 is 2804 Hz

F4 is 2713 Hz

kHz

+13 dl3m

dB)

IOk

RECEIVER Frequency

Frequency Range.. . . . . . . . . . . .

Resolution Accuracy

kHz

Level Range .

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (in

Q---40

K.s

.._........................

20 50 200

z-+13

10 Hz

FREQUENCY (Hz)

15k

.20

60k

Hz to 110

kO.5

-6Oto+13dBm

85k

3-60

kHz

Hz Hz

dl3)

IOk

Distortion: (in dB from fundamental)

(Includes harmonics, spurious and background noise within a filter with a 3 dB bandwidth of 4 is greater.)

FREQUENCY (Hz)

30 Hz

At 1004 Hz, 0 65 dB down from the fundamental.

Message Circuit Noise Transmitter is quiet terminated

100 Hz 4k

dBm,

THD using a 4

kHz

or 4

f0,

kHz

filter is more than

whichever

IlOk

Receiver accuracy not specified below 500 Hz when using 13562 termination.

At 1004

Cross talk:

octave above 4

Message Circuit Noise

Range (@

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Accuracy . . . . . . . . . . . . .

Filters . . . . . . . . . . .

kHz

accuracy is fO.l dB from -20 to

>78 dB

6OOa

13516 lower limit is 7 dB higher

isolation @ 4

kHz.

and

9OOn)

. . . . . . . . . . .O to 100

. . .+ 1 dB from IO to 100

.C-Message, 3

+I3 dBm.

kHz,

decreasing 6 dB per

+2 dB

from 0 to IO

kHz

Flat, 15

Program, 50

kHz

dBrn

dBrn dBrn

Flat,

kBit

Specifications describe the instrument’s warranted performance. Supplemental characteristics shown in shaded areas or in italics are intended to provide information useful in applying the instrument by giving typical, but non-warranted performance parameters.

Model

4935A

General Information

Table l-l.

TRANSMITTER Noise with Tone

Frequency . . . . . . . . . . . . . . 1004 Hz fixed tone

(For other specifications, see Level and Frequency)

Signal-to-Noise Ratio

Frequency . . . . . . . . . . . . . . . . 1004 Hz fixed tone

(For other specifications, see Level and Frequency)

3-Level

Impulse Noise

Frequency . . . .

(For other specifications, see Level and Frequency)

Noise-to-Ground

Transmitter is quiet terminated

P/AR (Optional)

Frequency . . Signal spectrum is a complex pulse train of

Level Range . . . . . . . . . . . . . . . . . . . . .-40 to 0

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

.1004

Hz fixed tone or quiet terminated

depending on filter selection

16 frequencies between 140 Hz and 3890 Hz.

SpecificatilJns

dBm

(Continued)

RECEIVER

Noise with Tone

Notch Filter. .....

Range (@ 600R and

Accuracy .................?I dB from 20 to 100

(For other specifications, refer to Message Circuit Noise)

Signal-to-Noise Ratio Signal Level Range

Ratio Range

Resolution .................................

3-Level

Impulse Noise

Level Range

Notch Filter. ................... .See Noise with Tone

Threshold Ranges (@

Low .............................

Mid

High : : : :....

Loss of Holding Tone Indication

Threshold Accuracy (above 40

Count Timer ............... 5,

Count Range ............... O-9999 for each threshold

Count Rate

Noise-to-Ground

Range (@ 600R and

Resolution Accuracy

P/AR (Optional)

P/AR Range. .................. .O to 120 P/AR units

Resolution ........................... 1 P/AR unit

Accuracy (from 30 to 110 P/AR units) ...+2 P/AR units

Level Range Resolution

.................................. 1

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

>50 dB

900R)

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

........................... IO to 45

....................... .-40 to

.4 dB

above Low to a maximum of 109

.8 dB

above Low to a maximum of 109

............................. 8per sec.

....................... .-40 to +3

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

rejection from 995 to 1025 HZ

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

*2 dB

from 10 to 20

.-40 to +I 3

6OOfi)

............ Minus sign

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

dBrnl

15,60

min. or non-stop

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

9OOfi)

IO-100

.30

to 109

.50

to 130

dBrn dBrn dBrn

dBm

.I dB

+I3 dBm

dBrn dBrn dBrn

+ 1

dBrn

+I .5 dl3

dBm

.I dB

Temperature Range:

Operating . . . . . . . . . . . . . . 0°C to 50°C

with batteries

Storage . . . . . . . . . .

with batteries

Warm up time @ 20°C for stated accuracy . . . . . . . . .5 min.

Dimensions .I 1.2 x 25.9 x 28.6 cm (4.4 x 10.2 x 11.25 in.)

Weight . . . . .

OPTIONS

001

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

002 Adds P/AR measurement in place of Norse-to-Ground

003 . . . . . . . . . . . . .

ACCESSORIES:

15513A . . . . . . . . . Test cord w/31 0 male at both ends

18132A 18134A

18161 A

.5.0

kg (11 Ibs.), 6.5 kg (14 Ibs.) with battery

. . . . . . . . . . . . . . . . . . . 19” rack mount adapter

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

. . . . . . . . . . . . . . . . . . . . . , . . . . . . .

O°C

-20°C

-2O’C

Adds rechargeable battery pack

Adds both battery pack and P/AR

Deletes Noise-to-Ground

Soft pack carrying case

(32’F

40°C (32OF

75’C (-4OF

45’C (-4’F

Ladder bracket

to 122°F)

104OF)

167OF)

to 113°F)

I-3

(;cnt~r:tl Inf’orm;rtIotl

1-9. SAFETY CONSIDERATIONS

1-12. RELATED MANUALS

1:;

( lI)t.ritting int’t~rtnation

summariztd

on it

t,arcl

the instrumt~nt t‘ovtsr.

l-14. USER REPAIR

I I

.-I.1 ntctrnal rthpairs tcl thta

c,ont;it.t thus tlta;lrtsst

It~u,l~~tt-~‘at,kartl Sales antI Servit,ta Of’fit~,

instrument should

1-16. OPTIONS AND ACCESSORIES

()I)( eon 002: Adds 1’ Al< (I’ta;ik! Avrragts Ratio) mr;lsurt~mrnt

t)rl dents by ;tuthoriztd rtbpair shops

listed at

the r(‘ar

of’ this manual.

Plato

of’

only.

I~orassistant~t~,

Nois+to-(;round

1 -4

I -%(I.

Itlstrumr~nt

warranty is as

listctl

thth insidtx of’ the f’ront c’ovt’r. Hattc~ry

1-21. RECOMMENDED TEST EQUIPMENT

l-22.

m;,y tit) llS~‘(l

tit~t~~~rnmc~ntlt~tl ttsst tquipmt~nt

listed

‘I’whlt~

l-2. Equipment with

warranty is 90 days

quivnlcnt

characteristics

Model

4935A

Table

INSTRUMENT

AC CALIBRATOR OUTPUT LEVEL 1 mV TO 1 OV

OSCILLOSCOPE

SYNTHESIZER OUTPUT LEVEL 1 mV TO 1 OV HP 3325A FUNCTION GEIcERATOR FREQUENCY: 20Hz TO 110kHz

MULTIMETER AC AND DC FUNCTIONS

DIGITAL MULTIMETER DUAL OUTPUT POWER

SUPPLY

1 DC CURRENT: 1 AMF’ MAX

1-2.

CRITICAL SPECIFICATIONS

FREQUENCY: 20Hz TO 11 OkHz

ACCURACY

15MHz BANDWIDTH

A VS B CAPABILITY

ACCURACY 0.1% @

AC VOLTS: 1V MIN. TO

DC VOLTS: .l V TO 1 BALANCED INPUT

+12AND-12@OTO0.2A

Recommended Test Equipment

O.l%@>7mV

>7mV

1OOOV

OOOV

MODEL

RECOMMENDEDIUSE* FLUKE 5200A

OR EQUIVALENT

HP 1740A

H P3455A

HP 3466A

HP 6234A

PAT

P,T

PAT

DUAL RANGE DC POWER SUPPLY

AUDIO ANALYZER

COUNTER RANGE: AC COUPLED 30Hz

*P = PERFORMANCE TESTS A = ADJUSTMENTS

Table 1-3. List of Parts Used for Performance Tests

PART NUMBER

(IF APPLICABLE)

0698-7364 0698-7408 0698-6344

11095A

1250-0781

1251-3757

0493560014

OdOVdc @

INPUT VOLTAGE RANGE

50mV-300V

BANDWIDTH 500kHz FILTER 3OkHz

100MHz

SENSITIVITY: 1 OmV TO 1 OOMHz

135ohm 1% RESISTOR

6000hm 1% RESISTOR

900ohm

TERMINATION, 6000hm BNC-TO-BNC BNC-TEE FEMALE BNC TO TYPE 310 POMONA NO. 2798 OR EQUIVALENT

BNC TO DUAL BANANA JACK POMONA NO. 1296

DUAL BANANA COMPONENT CARRIER POMONA NO. 1 DIAGNOSTIC SERVICE KIT

0 TO

0.2A HP 6218A

DESCRIPTION

1% RESISTOR

HP 8903A

HP 5315A

T = TROUBLESHOOTING

PAT

330-ST

General Information Model

497’,A

l-23.

l-24. Nickel-Cadmium batteries enable the 4935A to be used in areas removed from AC power.

Typical operating time

BATTERY OPERATION (Options 001 and 003)

is2.5

hrs when fully charged.

The batteries are trickle-charged whenever the

instrument is connected to an AC source and the POWER switch is in STBY.

1 -EL

Regular discharge-charge cycles are recommended to maintain battery capacity. The instrument

should be operated until batteries are discharged (instrument stops working) then recharged, at least every

30 days. Normal recharge time is about 17 hours. Typical battery life under normal operating conditions

should he at least 100 charge-discharge cycles.

l-26.

l-27.

Charging the Batteries

The internal battery pack consists of three rechargeable battery packs

(+6V, +156V,

and

-156V).

These provide typically 2.5 hours of continuous use without recharging. To recharge the battery packs, connect

the HP 4935A to an AC power source and press the power switch to STBY. Normal recharge time is about 17 hours.

I-28. greater charge capacity if charged between the

60-70’s

The batteries may be charged at temperatures between 5°C and

5’C

charge

acceptance

falls off’

and 25°C

as shown in Figure

1-2.

(41°F

For example, a cell charged at 45°C accepts about

and

4O’C

(41°F and

77’F).

At temperatures above 25°C

104”F),

but have

of its rated capacity. Temperatures below 5°C cause pressure to build up within the cell as it is

charged, which could result in venting of the cell. This results in a permanent degradation of the battery

capacity due to loss of electrolyte.

l-29. Operating Temperature

I-30.

between

Normal operating temperature of the I-IP 4935A with batteries (options

-2OOC

and

+40°C.

However, there will be a loss of capacity when operating at the extremes. At low

001

and 003) should be

temperatures, the batteries cannot fully discharge even if they were fully charged at room temperature. At high temperatures this same effect take

place

to a lesser degree, in addition to the problem of charge acceptance

previously mentioned.

100% EFFICIENCY

CHARGE INPUT (% OF NOMINAL CAPACITY) -

0 2 4

CHARGING TIME IN HOURS

40 80 120 160 200

O.IC

CHARGE RATE

12 14 16 18

- O.lC

CHARGE RATE

l-6

Figure 1-2. Charge

Acceptance at Various Temperatures

SECTION II

INSTALLATION

Installation

2-l.

2-2.

antI storagcb

2-3.

2-4.

INTRODUCTION

This section contains information on initial inspection, preparation

and shipment. Table 2-l shows all power cords available.

for

use, power requirements

INITIAL INSPECTION

Inspect the shipping container for damage. I“ the container or cushioning material is damaged, keep it. Check the contents of the shipment for completeness, then check the unit mechanically and electrically. Refer to Section IV for electrical checks.

2-5.

officbe

If the unit is mechanically damaged or fails electrical tests, notify the carrier and the nearest HP

(listed at the rear of this manual). Hewlett-Packard will arrange for repair or replacement of the

instrument without waiting for claim settlement.

2-6.

PREPARATION FOR USE

Before connecting this instrument to an AC power source, be sure that the rear panel line module is set to the

2-7.

2-8.

voltage is

POWER

This instrument requires a power source of 100, 120, 220, or 240

installedk.BiAmp

REOlJlk’lENTS

single phase. Power consumption is no more than 25

szme

voltage as the AC

for 120

so_urce

Vac<&Q@Amp

(I A. SC

Vat.

and that the correct fuse for that AC

for 220

Vat).

Vat. +5’%-lo%,

48 to 66 Hz

2-9.

2-10.

120

LINE VOLTAGE SELECTION

Figure 2-1 provides instructions for line

Vat

operation.

voltasje

selection. Card and fuse are factory installed for

PROCEDURE

1. Slide cover door to left (the line power cord must be disconnected).

2. Rotate FUSE PULL to left. Remove the fuse.

3. Remove the PC board by pulling it out. Select operating voltage by positioning PC board to show the desired voltage on top-left side,

4. Reinsert the PC board.

Operatang

shown In module window.

voltage

5. Rotate FUSE-PULL back into normal position and reinsert fuse. Use caution to select correct fuse value.

Figure 2-1. Line Voltage Selection

2-1

Installation

2-11. POWER CABLE

Any interruption of the protective (grounding) conductor (inside or outside the instrument) or disconnecting the protective earth terminal can make this instrumenl dangerous. Intentional interruption is prohibited.

Model

49:&A

2-12.

threewIre ac

This instrument is supplied with a three-wire power cable. When connected to an appropriate

power receptacle, the cable grounds the instrument chassis.

2-13. OPERATING ENVIRONMENT

2-14.

+122”F).

2-15. R.H. @ 40°C. However, the instrument should be protected from temperature extremes which cause

condensat.ion

TEMPERATURE. The instrument may be operated in temperatures from 0” to 50°C (32°F to

Temperature for battery unit operation is 0” to

HUMIDITY. The instrument may be operated in environments with humidity from 5% to 95%

within the instrument.

40°C

(32°F to 103°F).

2-16. STORAGE AND SHIPMENT 2-17. ENVIRONMENT

2-18.

2-19.

2-20.

obtained through Hewlett-Packard sales and service offices listed at the rear of this manual. If the

instrument. is returned to HP for repair, attach a tag listing the type of service or repair needed. Include return address, model number, option number (if applicable) and complete serial number. Also, mark the container ”FRAGILE” to ensure careful handling. In any letters, refer to the instrument by model number,

option number (if applicable) and complete serial number.

The 49:15A

Temperature:

Humidity: 90% R.H. @ 65°C

(all options) may be stored and shipped within the following environmental limits:

-20°C to

(-4OF

t45”C

+113”F)

Do not store or ship where temperature extremes will

cause condensation within the instrument.

INSTRUMENT PACKAGING

ORIGINAL PACKAGING. Containers and packing material used in factory packaging can be

2-2

Z-2 I.

materials:

2-22. please complete one of the blue tags located at the back of this manual and attach it to the instrument.

OTHER PACKAGING. Use these general instructions for packaging with commercially available

Wrap the instrument in heavy paper or plastic. If shipping to an HP Sales or Service Office, include a tag listing type of service needed, return address, model number, option number (if applicable) and complete serial number.

Use a strong shipping container such as a double-wall carton with 275 Ibs. burst test.

Use a layer of shock absorbing material, 70-100 mm (3-4 in.) thick. This provides a firm cushion and prevents movement inside the container. Protect the front panel with cardboard or the front cover.

Seal

the carton securely and mark it “FRAGILE” to ensure careful handling.

‘I’A(;GING

FOR SERVICE. If the instrument is being returned to Hewlett-Packard for service,

Installation

Table 2-1. HP

Stralghr ‘NEMA5 15P Straight ‘NEMA5 15P

Plus Stvles

Black

For Use

In Country

United

Kingdom.

Cyprus

Nlgerla

Australea

New Zealand

East and Europe, Saudi

Arabta

Umted

Canada. Japan

Wesl

Egypt.

Africa. lndla

unpolarlred in

many natIons

Stares

llOOV

81202104 3

8120.0698 6

8120 1957 2 8120 2956 3 90’

8120 1860 6

250V

-i

250V 8120-4600

8120.4211

Straight ‘SEVlOl

1959 24507

Type 12

Slralght ‘NEMAG 15P

Straight ‘DHCK 1117

Straight ‘CEE22 \/I

6yslerns Cablner use’

8 StralrJhl BS 5461SABS

7 90”

Taiwan

164

79 79

Gray

Gray Gray

Black Black

Swtrerland

United States Canada

Denmark

‘Part number shown for plug IS

lncludlng

E Earth Ground. L

plug

Lone

Industry ldentlfler

Neutral

for

pluq

only

Num xr

shown for cable IS HP Part Number for complete cable

2-t3/(2-4

blank)

Operation

SECTION

III

OPERATION

3-1.

:3-z.

c-odes ( Err-c,otlrs).

self’ check prc,cedurrs necessarv.

3-3.

:1-4.

major circuits are checked and any problems are identified. Self check does not specifications. instrument to pass any self check procedure indicate? a malfunction that can possibly affect other

mr:asurrmc~nt.s.

3-5. ERROR MESSAGES

3-6.

through thr filters. 0 through 6 indicate there are problems during self check. Errors 7 and 8 highlight problems during a

particbular measurc~mc~nt. FREI$UF:N(‘Y. &en measuremrnts indic,ativc

INTRODUCTION

This section contains information on front and re jr panel features, self check procedures, and error

Also covered are the principles of operation for all measurements. If any of the automatic

fail

acceptable

limits as specified in the checks, then adjustment or repair may be

SELF CHECK

The

self check procedures are performed automatically at power-up by the instrument. Most of the

verif.y

performance

I’rrformance

hthn

the

measurement. Other indications of errors during measurement are described by the particular

After startup self-check, the instrument automatically goes into Transmit Mode,

affected hy the displayed errors. Errors 0 t

of a system level failure more than a filter failure.

checks verify that the instrument meets published specifications. Failure of the

4!4:ki,A

is powered up, the instrument automatically transmits a signal into its receiver

The

signal is checked after each filter, to verify that it is within acceptable limits. Errors

if error messages occur, the instrument continues to operate correctly except for those

Trough 5

(Err O-Err 5) followed by Error 6 (Err 6) is

IXVEI,

I)15pla> otl F:rrors arc’:

F1rr

I*;rrl ~~ b.rr

I.:rrS

Krr

Err

Krr

6 Error in

l+Zrr

Krr

‘I’c~st signal cannot h(x measurt~d thrclugh C-Mt~ssagc~ ‘I’c~sl

‘I&t

‘I’tast

Test ‘I’esl

Err 0.

Received

‘I’ONE

IMPULSE NOISE threshold is

rctc&e impedanchtr

signal

c,a~~trot h(a mclasurc,d

signal cannot

signal

signal signal

cannot hc measurc>d thrclugh

cannot

c-annot

I,EVEI2 FREQIJENCY

1004

11~

or SIGNAL

RCVL2:

filter.

through 3

hc‘ mcxasurrd

he measured

be measured through P/AR filter. If not a P/AR unit refer to

tone is below -16

‘1’0

NOISE.

as follows:

13512 60012 90012 107 d Hrn

through 15

thrc.+$

signal path.

sct1

too high. Thr

kHz

flat

kHz

Program filter.

kHit

dBm

or above

116

dHrn lippclr

109 dBrn

filt~~r.

flat

filter.

upper

filtclr.

+13 dBm

Limit

NOISE:

limit varies with the

WITH

3-l

Model

4935A

Figure 3-1. Front and Rear Panel Controls/Connectors/Indicators

Model

49XiA

Operation

CONTROLS, CONNECTORS AND

INDIC.ATORS

Power Cord Module. Accepts power cord supplied with instrument. Contains line fuse and PC board for selecting line voltage (see Section II, paragraph 2-9 for procedure to select line voltage).

(WARNINGI

Always connect power cord to a proper y grounded

Do not connect more than 200VDC signal to terminals.

POWER button. Switches power to front panel

bvhen

in ON position. In STBY position power is

3-wire

power outlet.

still applied to some circuits. If unit has battery option there will still be power available to some

internal circuits even in STBY position.

NOR and REV switches. NOR switch depressed connects the left 310 jack to the transmitter and

the right 310 jack to the receiver. REV switch depressed connects the left 310 jack to the receiver and the right 310 jack to the transmitter. Both switches out simultaneously or depressed simultaneously internally loops the transmitter to the receiver.

DIAL Binding Posts. Handset can be connected to binding posts to dial-up a line through the 310

lacks.

SET UP Switches.

TRMT.

13512,

60012, 90012:

Provides terminating impedance to match the lines’ characteristic

impedance.

DIAL: Disconnects TRMT-RCV 310 jack from the transmitter and connects the TRMT-RCV 310

jack to the DIAL binding posts.

HOLD: Connects the hold circuits to the TRMT-RCV 310 jacks to hold dial-up lines.

RCV.

13512, 60011, 90012: Provides terminating impedance to match the lines’ characteristic impedance.

[(I~(;:

Connects the RCV-TRMT

:310

jack through

high

impedance when the

49:I5A

bridges

the circuit under test instead of terminating the line.

HOLD: Connects the receive-hold-circuits to the RCV-TRMT 310 jack to hold the dial-up lines.

I)ISI’lAY

(:orrcspondinu 131)

SF SKII’

designatrd

c,n

dial-up lines. Operates only in

I,EVEI,

measurements will be made in dB relative to this reference. DR

light.

Key. TKMT-RCV. Selects either the transmitted or the received

will

light.

Key. Prevents the transmitter from transmitting within

+I50

signal

to be displayed.

(300

Hz band) of a

frequency. This feature eliminates accidental disconnection by SF signaling units

LEVEL FREI$UENCY. I>EI)

ZERO Key. Sets a 0 dH reference in KCV

“-”

(minus) dH reading indicates levels higher than the reference level per the telephone

IXVEI, FREQIJENCY

will light when key is pressed.

mode. All subsequent

LED

in center of front panel will

industry convention.

STEEP

UP, STEP DOWN, + and

FREQUENCY: (-

~-f

selects the position of digit to be increased or decreased. Lighted cursor

--f

Keys. In TRMT Mode (right display) and LEVEL

indicates one-of-five digit positions. Digit value is incremented by pressing STEP UP and

decremented by pressing STEP DOWN. Holding the STEP UP or STEP DOWN key depressed

causes the actions to

Figure

3-I.

reneat.

Front and Rear Panel Controls/Connectors/Indicators (Continued)

Operation

1TRCV

Mode (left display) and IMPULSE NOISE;

or + selects the position of the threshold

digit to be increased or decreased. Lighted cursor indicates one-of-two digit positions. Digit value is

inc.remented d&-n

by pressing STEP UP and decremented by pressing STEP DOWN. THRESH LED,

and LOW(SET) LED will be on.

Model

4935A

10.

11.

12.

MEASUREMENT Section.

MK4S

Key. Selects measurement to be made. Lighted LED indicates selected measurement. For

detailed measurement information of each mode see Figure 3-3. Measurement modes are:

LEVEL

FREQUENCY (Blue)

NOISE

NOISE WITH TONE

SIGNAL TO NOISE

IMPULSE NOISE

N( )ISE TO GKOIINIl

(Standard units and option 001)

P/AR (Options 002, 003)

FILTER Section.

1’1

~‘I’KR~‘STOKK

wrighting-filter on right display to he stored for recall using the

used

change

Key. Selects desired weighting filter for Noise Measurements. Selected

I,EI)

will light. In

IXVEI, FKEQIJENC~Y

Fl, E’2, F:J,

the STORE function enables frequencies

or P4 keys. The STORE function is also

the SF SKIP Frequency.

IMPULSE NOISE Section.

Impulse-Noise controls are used in KCV and in conjunction with the MEASUREMENT section IMPULSE NOISE mode. Four keys control this section:

PERIOD/Fl-404

DlSPLAY/F2-1004

START

STOP/

RESET/F3-2804

F4-2713

PERIOD: Sets the instrument timer for the impulse noise test (5 MIN, 15 MIN, 60 MIN or NON-STOP). Also provides the

Fl-404

Hz preprogrammed frequency for LEVEL FREQUENCY

Mode.

DISPLAY: Changes the display through each of the threshold values and their impulse noise

counts then displays the TIMER setting selected by the PERIOD key. Also provides the

I-Ix

preprogrammed frequency for LEVEL FREQUENCY Mode.

F2-1004

START/RESET: Starts the impulse noise test and resets the count to zero for every threshold. Also provides the

F3-2804

Hz preprogrammed frequency for LEVEL FREQUENCY Mode.

STOP: Stops the impulse noise test but retains the displayed count values. Also provides the

F4-2713

Hz preprogrammed frequency for LEVEL FREQUENCY Mode.

Figure 3-1. Front and Rear Panel Controls/Connectors/Indicators (Continued)

Model

49:l:iA

Operation

13.

14.

OUTPUT LEVEL Control

Adjusts the transmitter output level

continuou;ly

displayed on left display.

MONITOR VOLUME Control and Speaker.

Permits adjustable volume for listening to the

Figure 3-I. Front and Rear Panel

Controlv/Connectors/Indicators

-40

dBm

from

cirl:uit

under test or to the Test Set Transmitter.

+13 dBm.

(Continued)

Output level is

Operation

3-7. OPERATING INSTRUCTIONS

Model

4935A

:I-H.

I:inurc :<-2

lists the various measurement modes available. A brief Power On and Set

preccdcs the* dctailcd explanation. accompanvinfi text.

POWER ON and SET UP

A.C. POWER

(‘onncct power

p;rragraph

Press POWER button ON. The 4935A will automatically do a self check of the transmitter, the filters, and the

BATTERY POWER (Optional)

Press POWER button ON with no power cord connected. When switching between battery and A C power cycle the POWER button from STBY to ON again.

cord to the rear line module on which the correct

2-9 of Installation section

Always connect power cord to a properly grounded 3-wire power outlet.

LEDs.

For operator protection during battery operation, connect

terminal on the rear panel to earth ground.

IJp

procedure

Each measurement mode is explained with a drawing and

line

voltage has been selected. See

for

procedure to

select line

voltages.

the

chassis

SET UP

Impedance

NOTE: Proper care in charging and discharging

NiCad

batteries can dramatically improve their

lives. Consult Section I of this manual for recommended procedures.

Connect circuit to 310 jacks. Do not connect more than

BOOVDC

or 10 Vrms at 60 Hz to these

jacks.

I’rcss

the

NOR button to connect the left 310 jack to the transmitter and

theright 810

jack to the

recf:iver.

reverse the direction of the test press the REV button IN

Press the TRMT impedance button 12 that matches the impedance of the circuit on the TRMT side.

Press the RCV impedance button $1 that matches the impedance of the circuit on the RCV side. If the test set is to be used in the bridged mode press the BRG button also. This means that in the bridged mode two RCV Setup buttons will be pressed in - the correct circuit impedance and the

BRG button. Note: Do not leave the BRG button IN while the instrument is actually terminating

the circuit as it will cause a 6 dB error.

Figure 3-2. Measurements

Operation

3-9.

MEASUREMENTS

LEVEL AND FREQUENCY-TRANSMITTER

f’.

Use

MEAS

key to select LEVEL FREQUENCY.

Press

I)ISPLAY-TKMT

can be read in

the

key to display the transmitted signal. TRMT light is ON.

left display and frequency in the right.

I,rvel

If SF signalling units are used on the circuit under test, press SF SKIP key to turn on SF SKIP. When the light is on the transmitter is blanked from 2450 Hz to 2750 Hz or

?150

Hz around a stored SF SKIP frequency. SF SKIP frequency is preset at 2600

IIz

(Skip will be 2600 Hz -t 150 Hz). The SF SKIP center frequency can be changed by putting the desired skip frequency into the transmitted frequency display. Then press the to disconnect the transmit side of

the

STORE:

key and the SF SKIP key. He sure

line from the test set first to avoid dropping the

circuit during the storage procedure.

Turn OUTPUT

IXVEI,. I)ATA IXVEI, sign

indicates the level is >

Use the STEP UP and STEP DOWN keys to set the desired frequency or press

1,EVEL

knob to adjust

is usually

I:( dR

tl:{ dHm.

A - sign indicates the level is < -40

the

level of the transmitted signal to

below the transmission level point

(TI,P).

dHm.

Fl,

I)ATA

A +

F2, F3 or F4 to recall any stored frequency. Holding a finger on either the STEP UP or STEP DOWN keys causes the transmitter to sweep.

STORE and and F4 when the

KECALI,

49315A

Frequencies. There are 4 frequencies stored in locations

Fl, F2, F3

is turned on. Fl is 404 Hz, F2 is 1004 Hz, F3 is 2804 Hz and F4 is 271 X Hz. To store other frequencies set the desired frequency in the transmitted frequency display, press the STORE key and press whichever location key,

Fl, F2, F:%,

or F4 that is

desired as the storage location.

Figure 3-2. Measurements (Continued)

Operation

LEVEL AND FREQUENCY-RECEIVER

Model

49315A

Use

MEAS

key to select LEVEL FREQUENCY.

Press

I)ISPI,AY

Read the

A -sign indicates received level is < -78

LEVEL ZERO - For attenuation distortion measurements press LEVEL ZERO key to set the received level at 0 this point. Pressing the LEVEL ZERO key a second time reverts the level to absolute units

(dBm)

the reference level per the telephone industry convention.

key to display the

RCV

level in the left display. A t sign indicates the received signal is

dB.

instead of relative units

reckeived

All subsequent level measurements will be made relative to

signal.

dRm.

(dB).

A negative reading indicates levels higher than

The

RCV

light

will come ON

:,+I 3 dRm.

Figure 3-2. Measurements (Continued)

NOISE -TRANSMITTER

Operation

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on.

Press

There will be no values displayed because in this configuration the transmitter is turned off and a quiet termination is supplied to the TRMT jack.

NOISE - RECEIVER

C’.

Press DISPLAY TRMT-RCV key to display the received signal. RCV light will be on.

Press

Press FILTER key to select the desired filter.

Read the

underrange (<0

MEAS

key to select NOISE.

MEAS

key to select NOISE.

dBrn

noise level in the left display. A

dBrn).

“-”

in the left display indicates

Figure 3-2. Measurements (Continued)

Operation

4935A TRANSMISSION TEST SET

HEWLETT .

PACK,aRD

NOISE WITH TONE - TRANSMITTER

n THRLSH

Model

4935A

1,.

(‘.

Press

MEAS

key to select NOISE WITH TONE.

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on

and 1004 Hz should be in right display.

Turn

OUTPIJ’I’

1 :I dl3

below the transmission level point).

XVEI,

NOISE WITH TONE - RECEIVER

Press

MEAS

key to select NOISE WITH TONE.

Press DISPLAY TRMT-RCV key to display the received signal. RCV light will be on.

Read

dBrn

in left display.

Note: Err ‘7 in the right display indicates the received 1004 Hz tone has dropped below

-46

dBm

or exceeded

knob to adjust 1004 Hz signal to data level in left display (usually

+13 dBm.

:3-10

Figure 3-2. Measurements (Continued)

SIGNAL TO NOISE - TRANSMITTER

Operation

AAAAA

Press

MEAS

key to select SIGNAL TO NOISE.

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on.

Turn OUTPUT LEVEL knob to adjust 1004 Hz signal to data level (usually 13 dB below the transmission level point).

SIGNAL TO NOISE - RECEIVER

Press

MEAS

key to select SIGNAL TO NOISE.

Press DISPLAY TRMT-RCV key to display the received signal. RCV light will be on.

Read the Signal to Noise ratio as dB in the right display. The received level is displayed in the left display.

Note: Err 7 indicates the received 1004 Hz tone has dropped below -46

+13 dBm.

dBm

or exceeded

Figure 3-2. Measurements (Continued)

3-11

Model

49):2X

4935A TRANSMISSION

HlIWLETT

. PACKARD

TEST

SET

[----I

POWE

IMPULSE NOISE - TRANSMITTER

Press

MEAS

key to select IMPULSE NOISE.

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on.

Press FILTER key to select the same filter as the receiver will use. Although the transmitted signal is not affected by the filter, selecting either the 15 PROGRAM or 50 tone.

kBit

kHz

FLAT,

filter will quiet terminate the transmitter instead of sending a hold

‘l‘urn

OIJTPIJT

transmission level point).

LEVEL knob to adjust the level to data level (usually 13 dH below

Figure 3-2. Measurements (Continued)

Operation

4935A TRANSMISSION TEST SET

IMPULSE NOISE - RECEIVER

(‘.

Press

MEAS

key to select IMPULSE NOISE.

Press DISPLAY TRMT-RCV key to display the received signal. RCV light will be on.

Press FILTER key to select the appropriate filter.

OUTPUT

Use STEP UP, STEP DOWN and f- + keys to adjust the level of the LOW threshold shown in the left display. The LOW threshold may be set at any value between 30 and

109

dBrn @ 6OOIl.

Note: Err 8 indicates the threshold is set out of limits. See paragraph 3-6 for limits.

C’.

Press PERIOD key to set the time of the test to 5 MIN, 15 MIN, 60 MIN or NON-STOP.

Press START-RESET key to start the test. The CNTNG LED by the right display will go

on to indicate that the test is in progress. Note that you can see how many counts have

been accumulated at each threshold by pressing DISPLAY key. When NON-STOP is selected, STOP must be pressed to stop counting.

The left display shows threshold or minutes; the right display shows the number

for the threshold selected.

Note: The 1010 Hz notch filter is automatically used when the C Message or 3

kHz

flat filter is selected, it

is not used for the other filters.

Note: A minus sign in the counts display indicates that the tone has dropped below -46 1

set

during the test. Tone dropout could cause invalid count totals.

dBm

for more than

ofcounts

Figure 3-2. Measurements (Continued)

3-13

Opwatiofr

4935A

TRANSMISSION TEST SET

Model 4935A

NOISE TO GROUND - TRANSMITTER (STANDARD UNIT and Option 001)

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on.

Press

MEAS

key to select NOISE-TO-GROUND which provides a quiet termination to the

TRMT jack.

NOISE TO GROUND - RECEIVER (STANDARD UNIT and Option 001)

For valid NOISE-TO-GROUND measurements the test set must be properly grounded. Connect the rear panel chassis ground post to a known good ground.

I).

Press DISPLAY TRMT-RCV KEY to display the received signal. RCV light will be on.

Press

MEAS

key to select NOISE-TO-GROUND.

Use FILTER key to select the desired filter.

Read

dBrn

noise level in the left display.

Figure 3-2. Measurements (Continued)

4935A

&I HEWLETT

TRANSMISSION TEST SET

PACKARD

Operation

OTHRESH

P/AR - TRANSMITTER (Option 002 and 003)

P/AR - RECEIVER (Option 002 and 003)

DIAL

(‘.

Press DISPLAY TRMT-RCV key to display the transmitted signal. TRMT light will be on.

Press

IJse

P/AR is +3

Press DISPLAY TRMT-RCV key to display the received signal. RCV light will be on.

Press

Read P/AR units in right display.

MEAS

key to select P/AR.

OUTPUT LEVEL knob to adjust signal level to data level. Maximum output for

dBm.

MEAS

key to select P/AR.

Figure 3-2. Measurements (Continued)

OperatilJn

I)IAI,

and

HOI,11 (WET I)IAI,-III’

DIAL AND HOLD PROCEDURES

and 2 two-wire circuits)

Model

4935A

The ,19:irjA has the r~xamplr:

pr0c~t~dur.c~

7. If

For 2 two-wire circuits, follow preceding steps 1 through 6 for the first side, then:

is as follows:

Connect circuit to left 310 jack.

Push NOR switch to connect TRMT side to left jack.

Conriect the

Push TRMT DIAL switch. Use the butt-in to dial the remote end of the circuit.

After

Push

testing.

the 4935A is designated the receive set, press RCV HOLD switch and then push REV switch to

connect RCV side to left 310 jack.

Push RCV HOLD switch.

Push REV switch to transfer the transmit side.

Push TRMT DIAL switch. Use the butt-in to dial-up the other end.

capability to hold wet dial-up lines (lines where the central office provides battery. For

)])I); I)irect I)istance I)ialing

butt-in handset to the DIAL binding posts.

the circuit is answered, push the TRMT HOLD switch to hold the circuit.

the

TRMT DIAL switch again to release it. This disengages the dial circuitry and allows

network). Dialing can be accomplished with a butt-in. The

After the circuit is answered, push the TRMT HOLD switch to hold this circuit.

Release TRMT DIAL switch by pushing it again.

Figure 3-2. Measurements (Continued)

Operation

3-10.

:1-I I.

paragraphs.

transmissicjn.

MEASUREMENT PRINCIPLES

‘I’hc~ principlrs for

Includrd

making mcasuromcnts with the

arc explanations of the

measurcmcnts

and

4Y:GA

are described in the following

the effects

of certain parameters on data

3-12. INPUT-OUTPUT SWITCHING

:i-I :I.

Pressing in the

simultanc~ously

illustratt~cl t)y I’igurch :L‘(.

:1-14.

I)ist.anc~c~ Ijialing:) test signal

:<-I;,. impcdanc’e st,lec-ted obta intd.

:I-l(i.

internal termination provides a resistive load which matches the impedance of the is button.

‘I’ho

TKMT and

NOR

button selects the transmit function for the left

performs the receive function. If the REV button is pressed in, the opposite is true as

I’rc*ssing the

without physically changing thr test

‘I’hcs

input and output

‘I’h(h

receive input may he internally terminated or bridged across the circuit under test. The

terminatcbd clxternally,

‘I’hta

bridged

two

circuits.

must match the impedance of the circuit under test, or erroneous measurements will be

mode

IICV

310 jacks provide

IIOI,I)

buttons allows

IJsrd

with the

impcdanccbs

the internal termination is switched out of the circuit by pressing in the

provides a high impedance receive input

NOK

connrction

the 49:GA

and

KI?V huttons

cables

are the standard values of’ I

between thr

to simultaneously hold two

this prrmits changing

and potentially dropping the circuits.

(LTeatrr

49335A

:I10

:S;i, 600,

than 50

and

the

circuit under test.

jack. The right

I)I)T) (Tlirrct

the

direction

900

ohms.

line

under test. If

kohms).

310

jack

ofthe

The 49335A

41X15A

the

line

HKG

-RANSMIT/REcEIVE

JACKS

1310

111

LEFT

JACK

TIP

RING

LEFT

DIAL

TRMT

I I

RIGHT

JACK

RIGHT

TRMT

t-Z&

IIMP:~CE~

RCV

IMPEDANCE

SELECT

TRMT IMPEDANCE

FROM TRMT

OUTPUT

I I

RCV

BRIDGE

1 1NOlSETO6

XFMR

l-l

Figure 3-3. Input-Output Switching

Operation

Model

493EA

:;-17.

tlal:ltl(.tad lint, induc~tancx~,

:i-lH. itIt lilcl ii,untiset

‘I’hcb ,Il):IT,A

t~l~~ctrically

shunt

‘1’0 ;~llow

dialing, talking, and listening on

terminals (binding posts).

input and output circuits are

capacitancca,

symmetrical;

and

the

two sides of’

leakage-tc,-Krounti.

balanced

thca

circuit under test,

3-19. LEVEL AND FREQUENCY MEASUREMENTS

::-“(I.

voic,cs c~h;~nnc~l, usc~l for :%I1 of theses

‘1%.

IXVKI,

(VARIABLE FREQUENCY

VARIABLE POWER)

TRMT

f+XEI~IJF:NC’Y

1000 f Is loss, frequency

functions.

+pm...+

TIMS

measurement identifies

shif’ts,

and attenuation distortion.

TELEPHONE CIRCUIT

)-.. ______-~

to match standard voice channel lines. A

the

line

have

equal series resistance,

th(,

lineman may plug his handset

the

amplitude versus frequency response of’ a

The

setup as shown in

dBm

RCV

Figure :3-4

TIMS

series

Figure 3-4. Level and Frequency Measurements

3-21. 1000 Hz LOSS

:j-22. The

transmitted data

:1-x1.

circuits. This 4 Hz offset avoids measurement errors caused by test frequencies which are submultiples of

t.hr H kHz “Rarrier”

reason.

1000 Hz loss measurement, determines the point-to-point loss (or gain) of a 1000 Hz test tone

over

a voice channel. To make this measurement, a 1004 Hz test frequency is transmitted at the

level.

At the receiving

The

wakeup transmit frequency is actually

49335A,

the received loss or gain is measured (in

100’1

Hz (not 1000 Hz), to prevent errors over certain

sampling rate. The other preset frequencies

dHm).

F,,

F.,,

and F, are offset for the same

3-24. FREQUENCY SHIFT

3-26. ATTENUATION DISTORTION

:s-27.

circuit using a single frequency measurement technique and defines the circuit’s usable bandwidth. To

make power is recorded as the reference level at 1004 Hz. Frequencies between 20 Hz and

transmitted. The

attenuation characteristics of the voice channel in

The

attenuation distortion measurement checks the amplitude-versus-frequency characteristics of

th(a mrasurc~ment,

different

a 1004 Hz test frequency is transmitted at the data level. At the receiving

110

power readings may be compared to the

dRm.

1004

Hz reference to obtain the frequency

49XA

the

Hz can be

Model 4W5A

Operation

:I-%

of the

dli.

The

To obtain loss deviations relative to 1004 Hz, the I,E:VEI,%ERO button is pressed during reception

100.4

I fz reference signal. The received power level is stored (in dHm) and simultaneously displayed as

I,c~vcl

readings taken at other frequencies are compared to the 1004 Hz reference and displayed in

IO04 flz

reference

level

will not have to be subtrartrd from levels at other frequencies to obtain

dH.

readings.

N9.

According to telephone industry convention, attenuation is defined as a change in loss of a telephone circuit, compared to the loss of a nominal 1000 Hz signal on that circuit. For example, a circuit with 6

(it%

3-30.

:j-:3 I

th(’

more loss at 2800 Hz would have an attenuation distortion of +6

SF SKIP

SI; Skip (single frequency skip) automatically prevents the

Z450

Hz to 2750 Hz range. This feature is used when transmitting over a dial-up network with single

49XA

dH.

from transmitting frequencies in

frequency signaling units. Any skipped frequency can be programmed using the STORE capability of the

49:K1A (see

Figure

:3-l).

3-32. MESSAGE CIRCUIT NOISE MEASUREMENTS

:x<:i.

Figurtz :(-5

The message circuit noise measurements determine the effects of background noise and tones.

illustrates the basic setup for these measurements.

LINE

MONITOR

(QUIET TERMINATION)

))

TELEPHONECIRCUIT

)

TRMT

TIMS

:%-x4.

The message circuit measurement is obtained by measuring the noise present on a line with a quiet

termination on one end (supplied by the transmitting end (receiving

:I-35.

4935A).

The C-message filter measures noise signals that annoy the typical telephone service subscriber.

Figure 3-5. Message Circuit Noise Measurements

49XA)

Cmessape weighting is also used to evaluate the effects of noise on voice-grade data circuits. C-weighting is

valid for data transmission since the response characteristic is relatively flat over most of the frequency range for data transmission (600 to 3000 Hz, see Figure

:S-6).

1 RCV

TIMS

and a weighted measuring device on the other

3-36.

Hz to 500 Hz) than the C-message filter. By comparing a

The 3 kHz flat filter has a response that provides much less attenuation to the low frequencies (60

kHz flat noise measurement to a C-message noise measurement, the relative influence of low frequency noise (60 Hz commercial power, 20 Hz ringing, etc.) can he determined (see Figure

Z-7).

Operation

Model 49‘EA<r *

-20

s s

-30

-40

100

200 500 1000 2000 3000 5000

Figure 3-6. C-Message Weighting Characteristic

-50

100 200 500 1000 3000 4000 6000

Figure 3-7. 3

Frequency

kHz

Flat Weighting Characteristic

(Hz)

Model

49:15/I

Operation

:!-:I7 US(YI

‘I’ho

primarily by thr

8).

:xw.

filt.clr,

:<-::0.

‘l’ht~ 15 kHz

1 t

inc~lutles

‘I’ht, 50 kl(it filtelr

101

program

low

-30

-40

weightrd filter

hrondcast

flat

f’ilttbr

is also

t’requrncy noise

dcsignrd

designed

industry to

for

c~ommunicate hetwrrn

dcsigneti f’or measuremc~nts

in the

measurr~mc~nt (SW Figure :]-$I).

mt~asurc~ wcightrtf noise

wcbightd noise mcaasurcments

studio and transmitter site

on program

c~hannrls. I,ike

on wide-band data circuits

on program channels

(SW IJigurr lb

the :3

kHz

flat

(sev b’igurc :S-

-50

-60

Hz 100 Hz

I I

100 200 400 1000

Figure 3-8. Program Weighted Filter

FREQUENCY (Hz)

kHz

FREQUENCY

I II

kHz

2000 5000

100

kHz

Figure 3-9. 15

kHz

Flat Filter

3-21

Operation

-8

-12

;

-16

w E

-20

I:“,:

100

Figure

FREQUENCY

3-10.

kBit

(Hz)

Filter

IOK

50K

Model

4935A

3-40. NOISE MEASUREMENTS

:(-‘I

llt~c~~ivrtl tomb ;It -90 dllm). For Whcbn the> (‘-mr~sag:r~ mess;rgc~ wt~ighttd

noise levels are displayed in units

example, a

filter is selected, readings are

measuring

noista

device

is displayed in

reading of 20

displa,ved

ofdlirn,

df3rn

dRm.

or dH with respect to reference noise (1000 Hz

has an

in units

RMS

power of -70

ofdRrn C

and

thenoise Ievc~l

dHm

(20 - 90 = -70).

with a

C-

3-42. NOISE-WITH-TONE (Notched Noise)

:1-4x.

the transmission system to their normal operating levels for continuous data signals. Therefore, noise

Ir~rls art’

:s-44.

At frequencies between 995 Hz and 1025 Hz are attenuated by 50

passe~l

illustrates the combination of the combines

3-45.

t3-46.

noise pc,wvr (S

:1-47.

4935A. thta

The remaining received signal (noise) is then compared with the original signal-plus-noise signal. The

computed signal-to-noise ratio is displayed in units of one or

The noise-with-tone measurement technique is used to condition compandors and/or

received which duplicate levels present under operating conditions.

make this measurement, a 1004 Hz test frequency (holding tone) is transmitted at a data level.

the

receiving

through a filter for measurement. The received noise level is displayed in units of

th(s

4935A,

the 1004 Hz holding tone is selectively attenuated by 50 dB using a notch filter (all

(:-message

notch with any of the five filters.

dR).

The remaining received signal (noise) is

weighting and notch filter characteristics. The 4935A

SIGNAL-TO-NOISE MEASUREMENT

‘I’he signal-to-noists

t N/N).

make this measurement, a 1004 Hz test frequency is transmitted over the line. At the receiving

1004 Hz signal is selectively attenuated by 50 dH in the notch filter, usually C-message weighted.

the

most important parameters for determining the quality of a line.

mode allows measurement of the ratio of received signal-plus-noise power to

dB.

Figure

:<-I

2 illustrates this measurement. This is

d&n.

quantizers

Figure

:3-l

Model

4’135A

Operation

-10

m 0

;

-20

-30

-40

dBm

,004H2

-50 60 100 200

500 1000 2000 3000 5000

Figure 3-l 1. C-Message Weighting with Notch Characteristic

1004 Hz

)

TELEPHONECIRCUIT

)

dBm

SIGNAL + NOISE

,‘,

COMPARE

S-T-N RATIO = 10 LOG

Figure 3-12. Signal-to-Noise Measurement

‘SIGNAL + ‘NOISE

‘NOISE

Operation Model

3-48 SINGLE FREQUENCY INTERFERENCE

49:EA

:1-31). ()cc;tsion;tl t~xampl~~,

Single

frequency interference refers to unwanted steady tones which may appear in lines.

bursts of low level tones which may occur from crosstalk of multifrequency signalling, for

do not fall in this category. Single frequency tones may interfere with certain data signals,

particularly narrowband signals which are multiplexed onto a voiceband channel.

:L-lo

;r(*(*(~t)titt>i(~ I~~vels c,ltec,k

rnc~s;tgc~ f’iltcbr, t.hc rc~sultant prc~tlomin;r nl tolls>, wl1ic.h

:i-51.

preserrt

A s~rn~~lcaudio monitorin~~arrangt~mr~ntwill

m;~(l~~

are easily

with

h(~;trtl if’thcs C’-mrssagc

the

setup shown in

Figure ;i-5. Af’ter

signal is applied to

may indicate a single

If’s

single frequency tone (or tones) of long duration is heard, single frequency interference may be

usually detect this

noise is within limits,

interf’erencc,

The

single frequency interference

the received noise signal passes through

thclint~monitor spt,~lk(~r.‘l’hr,,Il):(T,A

l’rrqucnc*y intcrf’erencc problem.

since

operator

tonesexceeding

the (:-

listensforany

and should be measured. To determine the frequency and level of the interfering tone, a frequency selective volt meter or spectrum analyzer must be used. Single frequency interference during a C-message filter

n~c~asurrmcnt

occurs if the signal is 3 dB or less below the

(:-message

noise limits.

3-52. IMPULSE NOISE

:<-5:<.

Transtent

:1-54.

than

energv.

than Waveform impulse threshold

The

S-level Impulse Noise Mode measures one of the most important transient phenomena.

phenomena can cause data transmission errors and/or interruptions to datacom systems.

Impulse noise is that component of

the

normal peaks of the message circuit noise. It occurs as short duration spikes and/or bursts of

the

received noise signal which is much greater in amplitude

Studies by Hell Telephone laboratories have shown that impulse noise spikes have a duration of less

one

millisecond, and that all significant effects of the noise spike disappear within four milliseconds.

(h)

in Figure

ncjiscs

spikes. The impulse noise measurement counts the number of noise spikes above a selected

level

during a specified time period.

:i-l:i

illustrates a received holding tone (or test signal) that includes interfering

(a)

TRANSMITTED

HOLDING TONE

(bl

RECEIVED

HOLDING TONE

WITH IMPULSE

NOISE SPIKES

I 2

TIME

Figure 3-13. Impulse Noise Waveform Representation

Model

4W5A

Operation

3-55.

:I-M.

with reference to ground. The transmitting channel. and the receiving

NOISE-TO-GROUND MEASUREMENT

The

49XA

uses noise-to-ground to measure the longitudinal noise present on a telephone circuit,

4935A

provides a quiet termination at one end of the voice

4935A

provides a frequency weighted filter and detector at the other end. The basic measurement technique used for the noise-to-ground measurement is very similar to the message circuit noise measurement; the main difference lies in the use of a ground reference. Figure this

dif’fereiice.

:<-14

illustrates

3-57

Noise-to-ground measurements are usually made for troubleshooting purposes; to measure the magnitude of longitudinal signals, which may indicate the susceptibility of a cable pair to electrical coupling from external sources. These measurements are also made to coordinate new installations with power

companies, to minimize power line coupling.

:kx.

ground

The relative line balance of an end loop can be calculated by subtracting the measured

(N,)

value from the measured message circuit noise (N.,) value. This calculation is only valid if the

noise-to-

measurements are made on a twisted pair and it is assumed that the message circuit noise is caused by

longitudinal noise converted to message circuit noise by line imbalance. It is recommended that both

message circuit noise and noise-to-ground be measured with the 3

kHz

flat weighted filter to include the

effects of power line related noise.

3-59. PEAK-TO-AVERAGE RATIO MEASUREMENT

3-60.

time of signal amplitude) due to transmission imperfections. As the P/AR signal traverses a dispersive medium, the peak-to-average ratio will deteriorate. Then by measuring the peak-to-average ratio at the receiving end, a simple measure of dispersion is obtained. P/AR is measured as the ratio of the peak to wave rectified average values of a specially processed test signal transmitted over a line. The test signal has a peak-to-average ratio and a spectral content that approximates a data signal. Figure frequency spectrum of the transmitted P/AR test signal, and Figure 3-16 illustrates the signal envelope.

The

4935A

uses the peak-to-average ratio (P/AR) to measure the channel dispersion (spreading in

315

illustrates the

full-

A E 1140.625

3 :

2 20 r:

x fi

Model 4935A

KEY FREQUENCY

A 140.625

8 c [I

G 1640.625

390.625

640.625

890.625

1390.625

1890 625

I 2140 625

2390.625 K 2640 625 L 2890 625

3140 625 N 3390.625 0 3640.625

3890.625

A--

BCDEFGHIJKLMNOP-

.joo

2000 3000

Frequency

(Hz)

Figure 3-l 5. P/AR Transmit Signal Frequency Spectrum

2 4 6 8

Time (mSI

Figure 3-16. P/AR Transmit Signal Envelope

Model

49’ISA

:i-6

The

P/‘AR

measurement is a single number rating of the fidelity of a voiceband channel and is a weighted measure of the total attenuation, phase distortion, and noise. The P/AR rating is derived by comparing the P/AR of an ideal signal with the P/AR of the output signal of the system under test. The

P/AR

measurement is most sensitive to envelope delay distortion and is also affected by noise, bandwidth reduction, gain ripples, nonlinearities such as compression and clipping, and other impairments. P/AR is simpler to understand than envelope delay because it is only one number instead of a curve. Also P/AR can be measured in loop-around mode with only one instrument, unlike envelope delay. If the P/AR signal were

received

the

entirely undistorted, the

pea k-to-;rveragc

ratio has a

R/AR

rating would be

P/AK

rating of 80.

100.

while a circuit that causes a

10%

reduction in

Operation

:M2.

particular case. However, since P/AR is a figure of merit for the channel, it can be used as a benchmark for future reference. After other measurements are made and a channel is considered acceptable, the P/AR rating can he recorded for future reference. In case of a suspected trouble on the channel, P/AR may be measured first and he compared to the benchmark P/AR value. Deviations in excess of +4 P/AR units from an initial P/AR value provides sufficient reason to suspect that some channel characteristic has changed significantly.

‘I’hc P/AR

measurement provides little information about the nature of the fault condition in any

3-27/(3-28

blank)

Model 49:GA

4-l. INTRODUCTION

Performance Tests

SECTION IV

PERFORMANCE TESTS

4-2. inspection and can be done without accessing the instrument’s internal circuits. If the instrument fails the tests, refer to the Service Section.

Tests in this section verify instrument specifications. These tests may be used as part of incoming

4-3. EQUIPMENT REQUIRED

4-4. characteristics may be substituted.

Kquipmrnt required for the performance tests is listed in Table 1-2. Test equipment with similar

4-5. TEST RECORD

4-6. recorded during incoming inspection can be used for comparison in maintenance, troubleshooting, and following repairs and/or adjustments.

Test results may be recorded on the test record located at the end of this section. Results of tests

4-7. SELF CHECK

4-x. arc tested in addition to all the front panel leds and seven segment displays.

4-9. PERFORMANCE VERIFICATION

4-10.

environment, the instrument should be checked every six months using the performance tests. Performance tests should also be made following repair or when internal adjustments are required.

4-l totally confirm that the instrument meets the published specifications. Perform the full test to verify that instrument’s performance completely meets the specifications.

Self check is automatically done each time the instrument is powered up. Some circuits and filters

This instrument requires periodic performance verification. Depending on use and operating

To shorten testing time, the abbreviated Performance Tests may be used. The test results do not

4-1

4-12. PERFORMANCE TESTS

PERFORMANCE TESTS

4-13.

Sfc’l’l

Transmitter Flatness at

‘I’:

MODEL 4935A

+lO dBm

COUNTER

BNC

ADAPTER

Figure 4-l. Transmitter Flatness Test at

VOLTMETER

0 000

+lO dBm

ncl

Fluky 52OOA

f I I’ .X 15

fI f’ :{49OA L!(J df3

Figure

(‘onnect

(:alihrator

C’ounter

Multimetrr

Amp (circuit shown in

4-l:])

Voltmeter to

f’OWF:R_. . I)ISI’I,AY_, SET 111’ MEASITREMEN’I’_.

Stst t.ht, .49):i5A

A(lj\lst 49:l:iA

to 1004 Hz

OIJ’I’I’lJ’l’

L’l~limetrr (notcx: 4935A

(‘t1(a(,k

the

49:GA

transmitter at the frequencies listed in

Ai, X,i kHz ;Irld

X5.004

verify that the

kHz.

HNC

to 310 adapter

2 HNC

cables

f3NC

“‘I”’ connectors

600

ohm termination

f3NC

the 49:GA TRMT

I,E:VEI,

jack as shown in

until

2.4:35

I,EVEI,

Vrms (9.95

must be terminated as shown above.

49:ISA

frequency when measured with the counter is between 84.996

banana cahlr

Figure

4-l

press in TRMT

TRM’I

CiOOU

E‘REQIJENCY

d&n

into 600 ohms) appears on the

Table 4-I

kHz

4-2

Model

49:15A

Performance Tests

PERFORMANCE TESTS

Table 4-l. Transmitter Flatness at

ACCEPTABLE VOLTAGE RANGE

AHHREVIATEI)

FREQUENCY

20 Hz

200

kHz

kHr

TRANSMITTER FLATNESS AT

See the Abbreviated Transmitter Flatness Test.

+lO dBm

2.17 to273 Vrms 2 38 to249 2 38 to249

2.38 to249 Vrms 2 30 to258 2 30

to 2

2 25 to264

+10 dBm

TEST

Vrms Vrms

Vrms Vrms Vrms

4-3

PERFORMANCE TESTS

Model

49:GA

4-14.

SE’I’I

Transmitter Flatness at -40

I I’:

MODEL 4935A

m-1

AC CALIBRATOR

Figure 4-2. Transmitter Flatness Test at -40

IJlukc 52OOA AC (:alibrator

I 20 dH amplifier

111’ W14A l)uul

(set:

figure

Output

4-I ii)

Power

dBm

Supply

VOLTMETER

OOOQQ

dBm

IO to banana adapter 2 banana plug test cables

HP :349OA

Multimeter

ii.

I’OWEI~

I)ISI’I AY

L 1

NOR SET

IJl’

MISASIJREMENT

Adjust

!+st t,hr <I.

IMPIJI,SE

the l’ower

AC Calibrator and the

Set

the

NOISE

Supply to

A(:

Calibrator to 7.746 mV (-40

floating.

I).

(‘onncct thta

voltage.

(’

(‘onnect the t20 dH

output with the voltmeter.

(1.

Adjust

th(l 49:GA

1 20 dH

f>xactly

NOTIC:

amplifier

-40 A 600 ohm termination is provided by the

dHm.

Service Kit and must be added if a high impedance amplifier is used.

. . . . . . . ..I........... ON

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

press in TRMT

HRG out

DIAL

both

HOI,I)s

I,IWE:I, F’REQUENCY

provide -t 12

49:EA

(:alibrator

V to

to exactly -40

to the

amplifier input to thr

OIJTI’U’I’

LIWEI,

iress I)ISPI,AY

the

t20

Amplifier

dRm

as follows.

dRm

into 600 ohms) at 1004 Hz with

t20 dH

amplifier input. Record the amplifirr output

49XA

TRMT 310 jack. Monitor

control until the voltmeter reading is the same as the

(1004 Hz)

output voltage in step b. The AC Calibrator and the

t20

amplifier in the

TRM’I

press

49XA

60011

out

the +20

are both set to

the

output

amplifier

IXagnostic

3-4

PERFORMANCE TESTS

Performance Tests

(in

Vout

mV)

‘4.

110

not change -40

dHm

setting on the AC Calibrator or the

49%A OlJTPUT LEVEI,

settings

during the rest of this test. Connect the AC Calibrator to the

Set the AC Calibrator to 20 Hz.

:i.

Record the voltage.

b. C’.

From Table 4-2 locate the horizontal voltage line closest to the recorded voltage reading. Use

$20 dH

amplifier input.

this voltage line (see example). EXAMPLE:

If the Voltmeter reading is 71.0

mV,

locate the 71.0 mV line from the

V,,,,t

column of Table 4-2. Locate the 20 Hz frequency column. The allowable voltage reading, when the AC Calibrator is substituted by the transmitter, is 79.7 mV to

Substitute I)( )WN Ido

From

the

4935A

TRMT output in place of the AC Calibrator.

buttons in conjunction with the - or -buttons to set the 4935A TRMT frequency to 20 Hz

not adjust the OUTPUT LEVEL).

Table 4-2, locate the voltage line identified in Step 3. In the vertical frequency column

63.S mV. LJse

the STEP UP or STEP

4935A

(frequency under test) identify the allowable voltage range. Verify that the +20 dR amplifier output is in this range.

Repeat Steps:1to 5

+I.0 dB

20 Hz

for each frequency column of Table 4-2

Table 4-2. Transmitter Flatness at -40

iO.2

200 Hz

kO.5

50 Hz

& kO.2

kHz

(20 Hz through 85 kHz).

dBm

irO.5

kHz

-i-O.5

kHz

65 0 65 4

65.8 66 2 66 6

67 0 67 4 67 8 68 2 68 6

69.0

69 4

69.8

70.2 70 6

71 0 71 4

71 8 72 2 72 6

73 0

73 4

73 8

74.2

74 6

72.9 to 57 9 68 9 to 61.4 66 5 to 63 5 73 4 to 58 3 69 3 to 61.7 66 9 to 63 9 73 8 to 58 6 69 7 to 62.1 67 3 to 64 3 69 7 to 62 1

74.3 to 59.0 70.1 to 62 5 67.7 to 64 7 74 7 to 59 4 70 5 to 62 9 68 2 to 65 1 70 5 to 62.9

75 2 to 59 7 71 0 to 63 3 68 6 to 65.5 71 0 to 63 3 75 6 to 60 1 71.4 to 63.6 69 0 to 65.9 71 4 to 63 6

68 9 to 61 4

693to61

7 69.3 to 61.7

68.9to61 4

69.7 to 62.1

70 1 to 62 5 70.1to62.5

70 5to 62 9

71 0to 63.3 71 4to 63.6

761 to604 71 8 to 64.0 69 4 to 66 3 71 8 to 64.0 71 8to 64.0 76 5 to 60 8 77 0 to 61 1 72.7 to 64.8 70.2 to 67 0 72 7 to 64 8

722to644

69 8 to 66 6

722to644

72.2 to 64.4

72.7 to 64 8

774 to 61.5 73 1 to 65.1 70.6 to 67 4 73 1 to 65.1 73.1 to 65 1 77 9 to 61 9 73.5 to 65 5 71 0 to 67 8

73 5 to 65.5 73.5 to 65.5

78 3 to 62 2 73.9 to 65.9 71 4 to 68.2 73 9 to 65.9 73.9 to 65.9 78 8 to 62 6 74.4 to 66.3 71.8 to 68.6 74 4 to 66 3

74.4 to 66.3

79 2 to 62 9 74.8 to 66.7 72 2 to 69 0 74 8 to 66 7 74.8 to 66 7

79 7 to 63 3 75 2 to 67.0 72.7 to 69 4 75 2 to 67 0 75.2 to 67.0 80 1 to 63 6 75 6 to 67 4 73 1 to 69 8 75.6 to 67 4 80 6 to 64 0 76 1 to 67 8 73.5 to 70.2 76 1 to 67.8 81 Oto643 76 5 to 68 2 73.9 to 70.6

76 5 to 68.2 76.5 to 68.2

81 5 to647 76 9 to 68 5 74 3 to 70 9 76 9 to 68 5

75.6 to 67.4

76.1 to 67 8 76 9to 68.5

81 9 to 65 1 77 3 to 68 9 74.7 to 71 3 77 3 to 68 9 77.3 to 68.9 82 4 to 65 4 77 7 to 69 3 75.1 to 71 7 77 7 to 69 3

82.8 to 65 8 78.2 to 69.7 75.5 to 72.1 83 3 to 66 1 78.6 to 70 0 75.9 to 72.5 83 7 to 66 5 79.0 to 70.4 76 3 to 72 9

78 2 to 69.7 78.2to69.7

78 6 to 70.0 78.6 to 70.0

79oto704

77.7 to 69.3

79.0 to 70.4

4-5

PERFORMANCE TESTS

Table 4-2. Transmitter Flatness at -40

Vout

(in

mV)

750

754 758 / 762 85 5 to 67 9 807 to71 9 78 0 to 74 5 80 7 to 71 9 766 i 85 9 to 68 3 81 1 to 72 3 78 4 to 74 9 81 1 to 72 3 81 1 to 72.3

‘l.OdB20Hz

1 84 2 to 66 8 79 4 to 70 8 76 7 to 73 3 79 4 to 70 8 79 4 to 70 8

84660672

0 to 67 6

4 to 68 6 81 6 to 72 7 78 8 to 75 2 81 6 to 72 7 81 6 to 72 7 86 8 to 69 0 82 0 to 73 1 79 2 to 75 6 82 0 to 73 1 82 0 to 73 1 87 3 to 69 3 82 4 to 73 4 79 6 to 76 0 82 4 to 73 4 82 4 to 73 4 87 7 to 69 7 82 8 to 73 8 80 0 to 76 4 82 8 to 73 8 82 8 to 73 8 88 2 to 70 1 83 3 to 74 2

88 6 to 70 4 83 7 to 74.6 80 8 to 77 2 83 7 to 74 6 83 7 to 74 6 89 1 to 70 8 84 1 to 75 0 81 2 to 77 6 84 1 to 75 0 84 1 to 75 0 89 5 to 71 1 84 5 to 75 3 81 7 to 78 0 84 5 to 75 3 84 5 to 75 3

90 0 to 71 5 85 0 to 75 7 82 1 to 78 4 85 0 to 75 7 85 0 to 75.7

90 4 to 71 8 85 4 to 76 1 82 5 to 78 8

9 to 72 2 86 8 to 76 5 82 9 to 79 2 85 8 to 76 5 85 8 to 76 5

91 3 to 72 5 86 2 to 76 8 83 3 to 79 5 86 2 to 76 8 86.2 to 76.8 91 8 to 72 9 86 6 to 77 2 83.7 to 79 9 86 6 to 77 2 86 6 to 77 2 9% 2 to 73.3 87 1 to 77.6 84 1 to 80 3 87 1 to 77 6 87 1 to 77.6 92 7 to 73 6 87 5 to 78 0 84 5 to 80.7 87 5 to 78 0 87 5 to 78.0

-1~0.5 dB

50 Hz

79 9 to 71 2 77 2 to 73 7 79 9 to 71 2 79 9 to 71 2

803to71

6 77 6 to 74 1 80 3 to 71 6 803 to71 6

fO.2 dB

& to.2 dB

804to768

dBm

200 Hz

kHz

(Cont’d)

LO.5 dB

kHz

83 3 to 74.2 83 3 to 74 2

854to76.1

i0.5 dB 85

807to71

85 4 to 76 1

kHz

93 1 to 74 0 87 9 to 78 4 84 9 to 81 1 87 9 to 78 4 87 9 to 78 4 93 6 to 74 3 88 3 to 78 7 94 0 to 74 7 85 8 to 81 9 88 8 to 79 1 94 5 to 75 0 89 2 to 79 5 86 2 to 82 3 89 2 to 79 5 89.2 to 79 5 94 9 to 75 4 89 6 to 79 9 86 6 to 82 7 89 6 to 79 9 89 6 to 79 9

9!i

4 to 75 8 90 0 to 80 2 90 0 to 80 2 90 0 to 80 2

95 8 to 76 1 90.5 to 80 6 87 4 to 83.5 90 5 to 80 6 90 5 to 80.6 96 3 to 76.5 90 9 to 81 0 90 9 to 81 96 7 to 76 8 91 3 to 81 4 88 2 97 2 to 77 2 91 7 to 81 8 88 6 to 84 6 91 7 to 81 8 91 7 to 81 8

97 6 to 77.5 92 2 to 82.1 92 2 to 82 1 98 1 to 77 9 92 6 to 82 5 92 6 to 82 5 98 5 to 78 3 93 0 to 82 9 89 8 to 85 8 93 0 to 82 9 93 0 to 82 9 99 0 to 78 6 93 4 to 83 3 90 3 to 86 2 93 4 to 83 3 93 4 to 83 3 99 4 to 79 0 93 8 to 83 6 90 7 to 86 6 93 8 to 83 6 93 8 to 83 6

99 9 to 79 3 94 3 to 84 0 91 1 to 87 0 94 3 to 84 0 94 3 to 84 0 100 3 to 79 7 94 7 to 84 4 91 5 to 87.4 94 7 to 84.4 94 7 to 84.4 1008 to800 95 1 to 84 8 91 9 to 87 8 95 1 to 84.8 95 1 to 84.8 101 2 to804 95 5 to 85 2 92 3 to 88 1 95 5 to 85.2 95 5 to 85 2 101

7to807

102 1 to 81 1 96 4 to 85 9 93 1 to 88 9 96 4 to 85.9 96 4 to 85.9

96 0 to 85 5 92 7 to 88 5 96 0 to 85 5 96 0 to 85 5

853to81

5 88 3 to 78 7 88 3 to 78.7

a4 2 91 3 to 81 4 91 3 to 81 4

90 9 to 81 0

4-6

PERFORMANCE TESTS

ABBREVIATED TRANSMITTER FLATNESS TEST

Pcrformancc Tests

USC test

SCI

setup

the 403SA as hollows:

shown in

Figure

4-2.

POWER -ON

DISPLAY - TRMT

NOR - press in SET UP -

BRCi

DIAL

out

0111

press

in TRMT 600

both HOLDS out

MEASLIREMENT -

Se1 Ihe 4935A

Adjust the OUTPUT LEVEL until

Cheek the 4935A transmitter

LEVEL FREQUENCY

IOO4Hz.

the

0.775V(O dBm) appcors

frcqucncics

given

Table

the

Voltmctcr.

4-3.

Table 4-3. Abbreviated Transmitter Flatness

VOLTAGES (VRMS)

FREQUENCY MIN MAX

20 Hz

200 Hz

kHz

kHz ,731

,690 ,869 ,757 ,793 ,757

,793 ,820

1lOkHz ,652 ,920

4-7

Performance

‘r&s

Model 4935A

PERFORMANCE TESTS

4-15.

SEW Jl’:

RECEIVER ACCURACY at

AC CALIBRATOR

Figure 4-3. Receiver Test at + 11 dBm and -40 dBm

Fluke

5ZOOA

AC Calibrator

111’53

t’rcc~llcncy (‘oulltcl~

1{10

BNC

adapter

HN(: “1”’

+ll dBm

COUNTER

and -40

dBm

BNC‘T’

BNC cables

2 BNC to banana cables

1 banana plug cable

MODEL 4935A

(‘onnect

the AC Calibrator to the

Setup the 4935A as follows:

POWER

I)ISI’I

L 1

REV . . . . . . . . . . . . . . . . .

SET

1JP

MEASUREMENT

RfiZ(‘151Vl2K A(:CIJRACY

Set ,2(: Calibrator output to 2.733 V (+10.95 dBm into 600 ohms; the0.05 dB offsetchecksfor round off

errors

in the

The 49XA

level and frequency displays should be within the limits shown in Table 4-3.

Rti:(:I~:IVER A(:CIJRACY

Set,

the AC Calibrator output to 7.702 mV (-40.05

‘I’hc 49:35A

level display should be within the limits shown in Table 4-4.

+11 dBm

4935A).

-40 dBm

4935A

RCV jack as shown in Figure 4-4.

. .

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

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

RCV

. press in .

press in RCV 6000

press in BRG

LEVEL FREQUENCY

dBm

into

600

ohms).

4-x

Model 4935A

PERFORMANCE TESTS

Table 4-4. Receiver Accuracy Test Table

FREQUENCY

(MONITOR FREQUENCY

AT COUNTER) tll DBM -40 DBM

50 Hz 105 to 11 4 200 Hz 500 Hz

1000 Hz

5000 Hz 10.8 to 11.1

15000

30000 Hz 105to 114

50000 Hz 105to 114 -40.5 to -39.6

85000 Hz 10.5 to 11.4 -40.5 to -39.6

110000

loot0

11 9

10.8to

11 1

108to

11.1

109t0110

10.8 to 11.1

goto

129 -42 0to~38.1~ i.01

-41

0to -39 1

-40.5 to

-40

-40 2 to -39.9

-40

-40 2 to -39.9

~40.5

-39

2 to -39 9

2 to -39 9 2 to -39 9

to -39.6 + 01

TOLERENCE

-tl

:il

-tl

i-1

k.01 kHz i.01

Performance Tests

kHz

kHz kHz

AHHRE:VIATEl1

2. Stlt

LJse

the test setup shown in Figure

the AC Calibrator to

Test the

RECEIVER ACCURACY TEST

4-:3.

.7791

V (-0.05

4935A

at each frequency given in Table

Table 4-5. Abbreviated Receiver Accuracy Test Table

FREQUENCY (0.7791

20 Hz 50 Hz

200 Hz -0.2 to +0 1

kHz

110kHz

0 to +0 9

~0.5

-02to+Ol

-0.5 to +0 5

-2 0 to tl 9

dBm

into 600 ohms).

4-5.

LEVEL FREQUENCY

to t04

dBm

dBm dBm dBm dBm dBm*

TOLERANCE

kHz

2.01 kHz

*For instruments with serial prefix

inf’ormation.

2207A

and below refer to Section VII Manual Changes backdating

4-9

Pdormance ‘I’c~sts

4-16. Autorange Test

AC CA

LIBRATOR

PERFORMANCE TESTS

Figure 4-4. Autorange Test

MODEL 4935A

Model

49’35A

.tt

:i.

I”luk(l 52OOA A(:

Calibrator 1 banana plug test cable

I BNC

bantina

adapter

(:onnect.

equipment as shown in Figure 4-4. On

POWER

r)rsI'I~AY':::::::::::::::::::::::::::::::::::::::::::::::::::::::::'R(:V

SW IJP

MEASI!KEMENT

St t,he A(: (:alibrator

l+‘clr tbach

voltage and range in Table

. . . . . . . . . . . .press

to 1000 Hz.

4-6

check that the display is within acceptable limits.

Table 4-6. Autorange Test

CALIBRATOR

VOLTAGE DISPLAY

86911 V 086911 V 191 to -189 0086911 V 39.2 to -38.8 00086911 V 594to

2 7484 V 0 27484 V 91 to- 89

0.027484 V

0.0027484 V

I,EVEI,

+09to

4935A

1~10.9

292to-288

49 4 to

select:

---48.6

RCV (iOOf2

FREQIJENCY

+11

~586

1.1

4-10

AHHKEVIA’I’EI) AIJTORANGE

Thrw

is no

;~hhrc+ated

Autorange Test.

TEST

Model

4935A

Performance Tests

PERFORMANCE TESTS

4-17.

Filter Tests

SETUP:

EQI JIPMENT:

Fluke

BNC

GENERA12

PROCEDURE

Connect equipment as shown in Figure

AC CALIBRATORAC CALIBRATOR

52OOA

AC Calibrator to dual banana test cable to

310

adapter

MODEL 4935AMODEL 4935A

Figure 4-5. Filter TestsFigure 4-5. Filter Tests

4-5.

3. On

Set AC Calibrator to

4935A

select:

POWER

DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RCV

SETUP MEASUREMENT

FILTER . . . . . . . . . . . . .

C-MESSAGE FILTER

Select the C-MESSAGE filter on 4935A. Check the response at each frequency in Table 4-7. The 4935A should be within the range given

,775

V (0.0

dBm

across 600 ohms)

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

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

RCV

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

select according to test

Table 4-7. C-Message Filter Test

FREQUENCY RECEIVED LEVEL

(in Hz) ACCEPTABLE READINGS

(dBrn)

300 73-74 900 89-90

1000

2500 3000

90 88-89 87-88

4500 66-71

60011

NOISE

4-11

I’erformanct~ ‘I’c~t,s

kIl% FI,A’I’ FIl,‘l‘ER

(‘h~k

giWl1.

the

TEST

rcasponse

PERFORMANCE TESTS

at each frequency in

Table4-8.

The

4935A

display should be within the range

Model

49‘Ii’A

T 1

Table 4-8. 3

FREQUENCY

S;c*l~~ct

tho I5

kHz PI,AT

(7l~c.k the responsc~

Filter on the

each

frequency in Table

kHz

Flat Filter Test

RECEIVED LEVEL

ACCEPTABLE READINGS

86-88

75-80

(dBrn)

4935A

4-9. The 49XA

display should 1~ within tho range

given.

Table 4-9. 15

FREQUENCY RECEIVED LEVEL

(in Hz) ACCEPTABLE READINGS

1000 90

15000

30000

kHz

Flat Filter Test

86-88

75-80

(dBrn)

4-l”

F’RO(;RAM I”II,‘l’ER

S&ct the

( ‘hrck

PROGRAM filter on the

the response at each frequency in Table 4-l 0. The

given.

TEST

49XA.

Table 4-10. Program Filter Test

FREQUENCY

(in Hz)

100 62-65

500 83-84

1000 90 2000 94-95 5000

10000 78-85

RECEIVED LEVEL

ACCEPTABLE READINGS

95-98

4935A

display should be within the range

(dBrn)

Model 4035A

ItBIT

FILTER TEST

PERFORMANCE TESTS

Performance

Tests

I. Sclcct

2. Cheek the

the

rcsponsc at

range given.

NOTCH FILTER TEST

I. Sclcct the

kBlT Tiltcr

on the

4935A.

each lrcyucncy

Toblc

NOTE

Test

must bc

Table 4-11. 50

FREQUENCY RECEIVED LEVEL

(in Hz)

1000 90

15000 89-90 25000 35000 84-86 50000

kHz Cltcr

and NOISE WITH TONE

pcrformcd

sccluencc given.

kBlT

Filter Test

ACCEPTABLE READINGS

87-88

62-67

4-l I.

The 493SA

(dBrn)

mcasurcmcnt

display should bc within the

the 4935A.

Cheek the

rcsponsc at

given.

FREQUENCY RECEIVED LEVEL

(in Hz)

At 400 tlz

the

DISPLAY FREQUENCY will not bc stable.

ABBREVIATED FILTER TEST

Thcrc is no

abbrcviatcd Filter Tat.

each frcclucncy

Table 4-12. The 4935A

Table 4-12. Notch Filter Test

ACCEPTABLE READINGS

400

862

1000 1020

1182

1700 90

288 <40 <40 288

NOTE

(dBrn)

should bc within

the range

4-13

Performance

4-18. IMPULSE NOISE DAC TEST

5tc’1’1’1’-

Tests

PERFORMANCE TESTS

Model

49XA

AC CALIBRATOR

Figure 4-6. Impulse Noise DAC Test

MODEL 4935A

h‘luke 52OOA AC: (:alibrator

HN(:

to dual banana test cable

:110

HNC

adapter

( ‘onnect

()I1 lcxiT,A w1ect:

equipment as shown in Figure

POWISK

4-6.

. . .

I)ISI’I,AY_. RCV

SET

IJI’

. press both

MEASIJREME:NT

h’II,TER IMI’IJLSE

NOISE . . . . .

. . . .

press

PER1011

I)ISPI,AY

to select NON-STOP

to select

6OOb2

buttons

IMPULSE NOISE:

kHz I;I,AT

Filter

I,OW(SET)

press START/RESET

Left

display . . . . .

adjust threshold to 90

d&n

4-14

:I.

9).

10.

11.

1%.

I:{.

14.

Set AC

The 4!):(5A

K;rise

The

Kepeat

Set the

I’ress IjlSPl,AY

Set the

I’ress 1)ISPLAY

Set the

Set the AC Calibrator to 1.457 V; the

(L~librator

signal source to 2

kHz

at the levels given in Table 4-l 3 (start with 0.580

should start counting.

the

49:35A lL)W THRESHOI,I) HY 1 dHrn.

4!):{5A

display should stop counting,

steps :I through 6 for each level shown in Source in Volts Table

LOW(SET)

A(: (Ldibrator

A(:

Calibrator to 0.920 V; the

A(:

Calibrator to

threshold to 90

IMPUI,SE

to 0.820 V; the

in IMPULSE:

I.299

dRrn

dHm).

NOISE to select

4!):<5A

4935A

display should count.

NOIEX

to select HIGH threshold.

V; the

41135A

display should not count.

4935A

display should count.

MI11

threshold.

display should not count.

4-I:].

Model

493A

PERFORMANCE TESTS

Table 4-13. Impulse Noise DAC Test

AC CALIBRATOR PEAK SIGNAL COUNTING NOT COUNTING

VOLTAGE IN

dBm

THRESHOLD THRESHOLD

Performance Tests

0 580 05 90 0651 0 730

0 820

0.920 1 032 1158 1 299

1.457

1.635

AHHKEVIATED IMPUISE

NOISE DAC TEST

1.5 91

2.5

3.5

4.5 55 95 96

65 96 97

7.5 85 98 99

9.5

There is no abbreviated Impulse Noise DAC Test.

92 92 93 93 94

97 98

100

4-15

I’rrf’ormancc~ Tests

Model

4935A

-___-

4-19. Count Limit Test

AC CALIBRATOR

EI)IJIPMP:NT:

Flukr :P%OOA A(: (:alibrator

I bzmana

I :1 IO to banana adapter

(‘onnect

plug test cable

equipment as shown in Figure 4-7.

PERFORMANCE TESTS

MODEL 4935A

Figure 4-7. Count Limit Test

POWER_. . . .

I)ISPI,AY

. .

Mb:ASlJFtEMENT_.

‘1.

fi.

IO.

Stst AC (2rlibrator

Adjust

Press the

L% ai t, 60

I’ress Impulse

‘I’hch l!XEA

I’rcss I)ISI’IAY butt.on

‘l’h(~ 49:15A

PII,TP:R IMI’IJI,SF:

the 49:%A

seconds and press STOP.

. . . . .

NOISE

to 2000 Hz,

threshold to 75

STAII’I’/KESF:T

Noise

I)ISPI,AY

display should indicate 480

Al3HIZE:VlA’l’F:I) (:OlJNT I,IMTT

‘I’htarti

is no abbreviated Count

I,imit

button.

TEST

,775

V (0.0

d&n.

button to

IMPIJLSE

Test.

The 4935A

lf-48

dHm

into

600

ohms).

IMPIJISE

right display should indicate 480

selrct MI11

threshold.

counts.

NOISE to select HIGH threshold.

_iilH

counts.

NOISE:

kHz

FLAT

I,OW(SET)

KCV

+48

counts.

4-16

Model 4935A

4-20. Termination Impedance Test

EQIJII’MENT:

PERFORMANCE TESTS

MODEL 4935A

310 TO BNC

BNC TO DUAL BANANA

llli lza

Figure 4-8. Termination Impedance Test

TEST RESISTOR

9OOf1, 6OOf1

13512

Performance Tests

HP 3490A Multimeter

1 310

to BNC adapter

BNC

to dual banana adaptor

Resistors -

Disconnnect

Connect equipment as shown in Figure 4-8. On

4935A

Measure the resistance across the transmitter and receiver jacks. Both should be greater than ohm.

Set up 4935A as follows:

90011, 60012,

4935A from AC power.

select:

POWER

NOR

REVI. . . . . . . . . . . . . . . . . . .

SET UP

As the DC blocking capacitors charge, the measured resistance may slowly rise. Set the Multimeter to the lowest resistance and increase the resistance as the meter overranges.

13511

. . . . . . . . . .

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

,..................

press in simultaneously

. . . . . . . . . . . . . . . . . BRG out

Both HOLDS out

press in RCV

press in TRMT

STBY

DIAL out

9000 90011

POWER

DISPLAY .................................

MEAXJREMENT OUTPIJT

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

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

LEVEL .........................

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

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

... LEVEL FREQUENCY

........

adjust to 0.0 dBm

RCV

4-17

I’erformancr ‘f’rsts

PERFORMANCE TESTS

Model

49XA

(i.

AHl~R~:VlA’f’EI~ ‘I’EKMINA’I’TON IMPEI)ANCE ‘I’ES’I

fCq>t~at the f’olfowing test tc~rmination impcdancrs sclccted c,hangfl.

11.

I’.

First

use a

LS~~ff~~~l. c~cluaf ‘I’KM’I’ ilnd R(:V

‘I’htx rfispfay shouftl rc>ad

f’rtlss

t,hr> HR(;

‘f’hr dispfz1.v

C’onnect rrbsistance

‘I’h(l display

lir~feast~ t,hts HR(;

!A.

R&urn

t1.

I’OWKK

f)fSl’I,AY

NOK

,z,~:v

the first resistor externally across the right jack. If

buttons pressed are

to step a and select the next resistor.

._,

Si+:‘l’ lJI’_.

MILASIJRJCMKN’I OI J’I’I’IJ’I’ I,EVEI,

three times.

9OOIl rrsistor,

button.

should

shouftf

rfxad

read

button and

0.0

6.1

0.0

‘f’hc procrtfurr

and

the vnlur

second a

termination impedances

dHm

dI3m +.I dHm

dllm

rcmovc

6001!,

90(X2, the

+.l

dI3m

the resistor.

and the expected result remain

thta

resistor

and finally u

resistor chosen should he

. . . . . . . . . . . . ON

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

press in both

. adjust to 0.0

placed

I;Cll

(110011, GOOll.

press

simuftanc~ously

I,EVEI,

FREQUENCY

across

resistor.

..__...

GOON!

or 1

the TRMT

buttons

the same. The

the R(‘V

:i51!)

9000.

RCV

dI<m

jack will

and RCV

I’rrss

I’r~ss

I’WSS

the HRG hutton. l’he

in hoth

in both

1:15f1

impedance buttons.

900~~

impedance buttons.

display should read 6.1

The

display should

‘l’hc

display should

dHm i.1 dHm

read

0.0

read

0.0

dl3m ItO. dHm.

dRm 10.1 d‘l3m.

Model 4935A

Performance Tests

PERFORMANCE TESTS

4-21.

SETIJI’:

EQI JII’MENT:

2. On

Hold Tone Dropout Detector Test

Fluke XXlOA AC Calibrator

1 BNC

:110

Connect equipment as shown in Figure 4-9.

4935A

AC CALIBRATOR

Figure 4-9. Hold Tone Dropout Detector Test

to dual banana test cable

to RNC adapter

select:

P3WER

DISPLAY . . .

NOR SET UP MEASUREMENT FILTER

. . . .

. . . . . . . . . .

. . .

. .

. . .

. . . .

. . .

. ...

MODEL 4935A

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

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

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

press in RCV 6000

‘NOISE WITH TONE

........

C-MESSAGE

RCV

press in

ABBREVIATED HOLD TONE DROPOUT DETECTOR TEST There is no abbreviated Hold Tone Dropout Detector Test.

Set AC Calibrator to

I,ower

the AC Calibrator level until Err 7 appears on the

On 4935A select LEVEL FREQUENCY and read the signal level from the display. It should be-46

dHm -t:! dRm.

1OmV

at 1004 Hz.

4935A

(between 3-4

mVrms).

4-19

4-22. HOLD CIRCUIT TEST

sr, I. 1.11’:

Modcl 493SA

PERFORMANCE TESTS

POWER SUPPLY

r--i

Cheek (hc po~vcr

Figure 4-10. Hold Circuit Test

tIP 62

I XA

Power SuppI\

II’ 3455A

IHP 346hA Rlilliammctct

C’onncd cquipimcnl

AC-DC

4035A sclcct:

Vollmctc~

its shown in Figure

supply

VOLTMETER

oulput with the

4-10.

Volbmkr.

MODEL 4935A

INOR II

310 TO BANANA PLUG

Ad.iust Lhc oulput lo 6.9V 2.2 vDC.

n \

I I I

4-20

DISPLAY NOR

SET UP -

7. Set the rnoniloring Vollniclcr

The DC.’ currcn(

Ihc 4935A press

Rc\,crsc the power lhc TRM’I‘

for 50 VDC. The

l’rcc;~ tn

and

NOR

‘I’RMT

prcs\

press

in TRMT

prcm

Lhc milliamniclcr

Ihc

supply

RCV

HOLD

DC’

currcnl reading shoulJ bc

hulton. The DC

IHOLD

in RC’V HOLD

sl~ould bc

REV

btt(ton.

Icads.

The DC

circuik. Rclutm the power

to it voltage

current should hc

24.OmA +.SmA.

currcn( rcatlings

range

of 50V or less than 26

less than

should

supply

grcatcr and acl,iusl the power

lcads

mA.

24.0

Ihc nortnal polarily.

+SmA

in both

supply

Model 4935A

4-23. Distortion Test

SETUP:

Performance Tests

PERFORMANCE TESTS

EQIJIPMENT:

HP HP

kHz

20 dB amplifier (included in Diagnostic Service Kit)* 2

310

2 BNC to BNC test cables

6000

Connect equipment as shown in Figure 4-11.

On 4995A

MODEL 4935A

Figure 4-l 1. Distortion Test

6234A

Dual Output Power Supply

8903A

Audio Analyzer

Low Pass Filter (included in Diagnostic Service Kit)*

to BNC adapter

load

select:

AUDIO ANALYZER

POWER

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

DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOR

. . . . . . . . . . . . . . . . . . . . . . . . . . press in

SET UP MEASIJREMENT

Set the Audio Analyzer to measure distortion in Enable the 30 Measure distortion at the following points.

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

. . . . . . . . . . . . . . . . . . . . LEVEL FREQUENCY

dB.

The input should be floating.

kHz

low pass filter on the Audio Analyzer.

FREQUENCY OUTPUT LEVEL DISTORTION

100

Hz ai

4000

t10

+lO dBm

df3m dBm

dBm

press in

555

TRMT 60011

TRMT

*set‘ figure

4-l :% for circuits

4-21

Performance Tests

Model 4935A

PERFORMANCE TESTS

Turn off the 30

kHz

low pass filter on the Audio Analyzer.

Measure distortion at the following points.

FREQUENCY 1 OUTPUT LEVEL

. _,

110

kHz

Connect an amplifier with Supply should supply Figure 4-l 3 for the circuit and Table

MODEL 4935A

+20 dB

i12

V to the

al +

CI -20 dBm

gain in the signal path as shown in Figure 4-12. The Power

+20 dB

Amplifier and 4

4-14

for the Parts List.

dBrn

df3m

DISTORTION

[

250

kHz Low

AUDIO ANALYZER

Pass Filter Board. See

10.

II.

1%.

Enable the 30

Figure 4-12. -40

kHz

low pass filter on the Audio Analyzer.

dBm

Distortion Test

Measure distortion at the following points. The 4 measurement.

(1bangr

the

FREQUENCY

1OOHr

4000 Hz

+20

dl3

amplifier to unity gain and switch in the 4

OUTPUT LEVEL

-40

dBm

~40 dBm

Measure distortion at the following point.

20 dB AMP AND 4kHr LPF

kHz

low pass filter should not be used in the

DISTORTION

1C50 dBm

.r50

dBm

kHz

low pass filter.

4-22

FREQUENCY

1004 Hz

OUTPUT 1 EVEL

dBm

DISTORTION

565

Model

4935A

+20 dB

Amplifier Circuit

PERFORMANCE TESTS

kHz

Low Pass Filter Circuit

Figure 4-13. Filter Circuits*

Table 4-14. Filter Circuit Parts List

Performance Tests

REFERENCE DESIGNATOR

Cl c2 c3

RlO

Rll

Ul Sl

J2 J3

PART NO.

0160-3468 0160-3468 0160-6405 0160-6185

1901-0040 1901-0040

DESCRIPTION

0.12uf +5%

0.12uf +5% 10K

+l%

1 K pf

+l%

Diode Diode

0698-7408 6000hm +O.l% 0757-0442 0757-0442

0757-0465

0757-0442 0757-0465

0757-0442

0698-3450 0698-3450 0698-3151 0698-7408

1826-0712 3101-0973 3101-0973

1OKohm +l%

1 OKohm +l

% lOOKohm +l%

1 OKohm +I

% lOOKohm +l%

1 OKohm +l

42.2Kohm +I %

42.2Kohm +l%

2.87Kohm +l%

6000hm

OP Amp

+O.l%

DPDT Switch DPDT Switch

1251-3677 310 Jack 151 O-0076 Binding Post 151 O-0076 Binding Post 151 O-0076 1251-1780

Binding Post BNC Connector

* The Diagnostic Service Kit (HP 04935-60014) contains a test board with this circuit.

4-23

Performance

‘Pests

PERFORMANCE TESTS

Model

4935A

AHHf~P:VIATICT) l)ISTORTION

jisconnect

( h 49:KiA

POWER

I)ISf’I,AY

all cables from the

select:

. . . . . .ON

. . . RCV

SET111 MEASIJREMENT

OIJTI’IJT LEVEL

:1.

For

each filter in Table

out of

tolerence,

perform the complete Distortion Test before troubleshooting.

TEST

49XA

input.

press in both NOR and REV buttons

. . . . . .

. .adjust to 0.0

4-15

the displayed level should be within the given range. If either level is

Table 4-15. Abbreviated Distortion Test

SIGNAI,

TO NOISE

dHm.

4-24

Model

4W5A

4-24.

P/AR

Performance Tests

PERFORMANCE TESTS

Test

EQUIPMENT:

Fluke 5200A AC Calibrator I BNC to dual banana test cable

1 310

CJonnect equipment as shown in Figure 4-14. On 4935A select:

AC CALIBRATOR

to BNC adapter

POWER

...........

DISPLAY ..........

REV

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

SETUP

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

MEASUREMENT .

Figure 4-14.

. . .

. .

. . .

P/AR

MODEL 4935A

Test

. . . . . . . . . . . . . . . . . . . . . . ON

. . . . . . . . . . . . . . . . . . . . .RCV

. . . . . . . . . . . . . . . . . . press in

press in both

6OOn

,....................

buttons BRG out

P/AR

Set the AC Calibrator for a 300 Hz sinewave at 0.495 Vrms (-3.9 dBm). For each frequency in Table 4-16 check that the right display is within the acceptable limits.

Press DISPLAY to change the 4935A to TRMT mode. The right display should read 100 Vary the OUTPUT LEVEL to obtain a left display reading between -12

P/AR

reading in the right display should not change by more than 1 P/AR unit.

AHBREVIATED

Perform only steps 4 and 5 of the P/AR Test.

P/AR TEST

Table 4-16. P/AR Filter Responses

FREQUENCY

300

Hz -30

1000 Hz

2300

Hz -10

ACCEPTABLE LEVEL

dBm

dBm dBm

+l.

dBm

and -1

dBm.

The

4-25

Performance

4-25. Noise To Ground (Standard and Option 001)

SISTI

‘feasts

‘I’:

AC CALIBRATOR

I.‘lukv

S,%OOA A(: Gllibrator

:(I0

HNC:

txlnana

PERFORMANCE TESTS

Figure 4-15. Noise to Ground Test

1 shorting strap

adapter 2 banana cables

HNC:

connector (female)

GROUND LUG

BNC TO DUAL

BANANA ADAPTER

Model

493,5A

I!.

.3.

‘I‘IICIX i\

(:onnect

equipment as shown in Figure

POWER . . .

I)ISPI,AY

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

MEASIJREMENT

SIi’l‘l II’

(‘cmnccl ,,ic’ C:lIibralor

Short -1035~4 input

Set

AC Calibrator output to

read

.\l)lw\ iatccl

‘XkiBrn

..,,..,.................................

+ 2dBrn.

Noise

4-15.

4935A

select:

. . . .

NOISE TO

press in

low (0 ground lug on

(lip

and

ring) and

.7746

Vrms at

Grountl

Test.

cot~ncct

4035.A rc;~r

Lhc

AC‘

loo0 Ilz. 4935A

p~iticl.

Calibralor

display should typically

RCV

GROUND

both 600 button\

IHIGH.

BRC;

4935A

Performance Tests

Performance Test Record

.--

DESCRIPTION

Self Check Transmrtter Flatness at Transmrtter Flatness at -40

Recewer

Autorange Test

Falter

impulse Norse DAC Test Count

Termrnatron

Hold-Tone Dropout Detector Test

Hold Circuit Test P/AR Test Norse-To-Ground Test (Standard Unit Only)

Distortion Test

Accuracy at

Tests

Lrmit

Test

Impedance Test

iOptIons

+lO dBm

dBm

+12 dBm

002 and 003 only)

and

~40 dBm

DATE

RESULTS

PASS

FAIL

Longitutal Balance Setup

4-27/(4-28

blank)

Model

4935A

Adjustment/Calibration

SECTION V

ADJUSTMENT/CALIBRATION

5-1.

5-d.

Transmission Test Set. Verify all adjustments and calibrations with the tests in Section IV, Performance Tests.

5-3.

r,-4. cquipmrnt. Whenever internal instrument circuits are exposed, caution must bc exercised. When using AC

powc>red test S’I’HY

completely power down the instrument, disconnect it from the AC power source. For instruments with the

hattcrics cOptions

INTRODUCTION

This section contains adjustment and calibration information for the HP Model 4935A

SAFETY CONSIDERATIONS

isted

warnings and cautions must be followed for your protection and to avoid damage to the

equipment, the test equipment chassis should be connected to earth ground. With the

(standby)

A(:

power is still applied to

002 and

Power switch does not turn off AC power and some DC power circuits.

00:1),

disconnect the three batteries and the AC power source.

the

instrument and some

I)C

voltages are still present. To

49:35A

5-5.

5-6.

specifications may be substituted.

5-7.

5-x.

top is secured by four screws located on the bottom of the instrument. For the complete procedure refer to the Mechanical Disassembly Procedure in Section VIII, Service Section.

EQUIPMENT REQUIRED

Test equipment needed for adjustments is listed in Table 1-2. Test equipment with equivalent

Instrument Access (see warning of paragraph 5-4)

‘I’hfb

instrument’s internal circuits and assemblies are accessed by removing the case top. The case

When the 4935A is in STRY, AC power is still present in the instrument as well as some

voltages. Disconnect AC power from the instrument before opening the case or

removing any assemblies.

5-9. ADJUSTMENT LOCATIONS

5-10.

Adjustment locations are shown on the component locaters at the end of Section VIII.

5-1

Ad,jus~mcrl(~( ‘alilmlion

5-11. ADJUSTMENTS

Model 4935A

5.12. Ad.iwtmcnts done

prior to making any

~xiragraph

Thcrc

!I. Outpul Lcvcl and Trunsmil

d. Notch Filler

A I3

Hold Circuit

5-7.

arc cix ad~ius~mcnt proccdurcs Tar the 4935A.

Power

Supply

Reccivcr

P,‘AR Filler

should hc

Adjustments

iuvlmcnls

Ad,jusln~cnts

AdJustments

done

and Latch

lhc

scqucncc

inlcrn:ll adjtlslmcnls. Access inslrumcnl

Monitor Loop

Ad,iustmcnts

given. Power SuppI)xl

Ad.iuslmenls

iurlmcnts shoulcl bc

circuits IS

dcscrihcd

Model

49:15A

5-13.

REFE:RENCE:

EQIJIPMI:NT:

A4 Transmitter Assembly

ADJUSTMENTS

+14

V, and -14 V Power Supply Adjustments

Adjustment/Calibration

I’RO(‘El)IJRE:

10.

Press power button ON

(Connect

Voltmeter should read

Remove the Voltmeter and connect the Oscilloscope to

mVAC.

Connect the Voltmeter to A4JIJ+14. The Voltmeter should read

Remove the Voltmeter and connect the Oscilloscope to

mVAC.

Connect the Voltmeter to A4JU-14. The Voltmeter should read -14 VDC +25 mV and is not adjustable. If the reading is incorrect the

power supply is defective and should be repaired.

Remove the Voltmeter and connect the Oscilloscope to

mVAC.

1)C

Voltmeter

Oscilloscope

the Voltmeter to

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

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

A4JUt5.

+5VDC k20 mV.

+14

VDC

If not, adjust

+JO mV.

If not adjust

A4R42 (+5

A4JU+5.

A4R31 (+14V ADJ).

A4JU+14.

A4JU-14.

HP 3490A HP 1740A

ADJ).

Ripple should not exceed 100

5-3

ADJUSTMENTS

5-14. Output Level and Transmit Monitor Loop Adjustments

RFFERIINCE:

A-l

Tran\mittcr Asscmbl)

SET C’I’:

MODEL 4935A

VOLTMETER

Model 4935A

PROCEDlIRE:

5. h,lo\,c the

Figure 5-1. Output Level and Transmit

Monitor Loop Adjustments

Connect Equipment ;IS sho\\,n

6OOohms

493SA sclcct:

DISPLAY NOR/REV - NOR

MEASLIREMENT -

SET UP - press in TRMT

Adiust AdR74(0UTPUT

iu3t the

OUTPUT LEVEL for ;I

AC’VM to

TRhlT

LEVEL FREQ

press

in RCV

BRG

out DIAL out both HOLD3 out

OCITPUT

ADJ)

A3TP25.

Figure

S-l.

500

600

LEVEL - turn full clockwise

I‘or a rcacling

reading

of 3.42 to 3.43 Volts on

775mVrms 2 IOmV.

the ACVhl.

j-4

iust AJR72(LOOP

Rcchcck the OCITPCIT

step]. continue.

4....

Otherwise.

ADJ.) until I(

LEVEL. If

repeat steps

agrees

with

the voltage rcuding

the

HP3455 ACVM still

3-h.

step‘s; 4,

rcacl% wlthin +lOmV

the \‘ottage

5-l

RECEIVER ADJUSTMENTS

REf’ERf!N(‘E:

ADJUSTMENTS

A3 Rcccivcr

EQIJII’MENT:

Offset

11.

SET

Uf’:

VOLTMETER

Assembly

AC-DC AC‘

vollnlckr - t1r

C‘aIibr;Itor - Fluke 52OOA

4035A sclcc\:

DISPLA1’

TRMT

MEASUREMENT - NOISE

NOR/fIEV -

iusltncnl:

Short A3TI’I Short A3T1’22

Mcasurc

+.3mV

Rcmovc Ihc

NOR

0 to

the DC voltage al

DC'.

shorts

3455

A3TP2

A3TP23

plxctl

1724 Ad~usl A3R33(OFFSET

Step 2~.

AC CALIBRATOR

ADJ) iT the

voltage

MODEL 4935A

not wilhiu

FIG 5-2. Receiver Adjustments

Connect the ccfuipmcnt as

4035A sclcct:

DISPLAY NOR//REV - NOR MEASUREMENT - LEVEL FREQ

SET

llf’ -

RCV

KC’V

hO0 BRG boll1 IIOLDS out

shown in

Figure S-2.

ADJUSTMENTS

Motlcl 4935A

‘).

IO.

j-l0

M0i.c the

,ZJiust AiR23 (AVG

<‘hcch ~h;rt the i\c’L’M

,\cl iust A3R65(QRMS DET)

Thcrc arc problems ;I

quick

Attach ;I

Vary the

wavcrorm

other.

ACVM to

LEVEL

FILTER -

cheek

scope prohc

DISPLAY MEASUREMENT - LEVEL FREQ

OLlTPlJT

A3TP25

DET) until

FREQLIENCY - change

change

to I

still

that

verify

that

A3TP23(full wave

TRMT

LEVEL from 0

A3TP23 shoulcl bc ;I

and

acl,iust A3R77(RCV

the

display

Sl\lHz

rc~~cls X I6mV +O.SmV at A3TP25.

until

the

could

undctcctcd

the instrument I)asically u,orks.

JBm

full

flickers bclwccn 0.3and

to NOISE

display

flickers bctwccn ‘10 and ‘1

using

rcctificcl output).

to +I 2.0

wave rcctificd sinc\cavc

GAIN)

onI\, ;I

dBm,

[or ;I reading

Voltmctcr.

starting at 0 and finishing at +I 2.9.

with

of 8

I6mV +WmV.

0.5

dBm.

dB1n.

The

following

the peaks \cithin

test

50 mV of

intcndcd

The

each

(1.

the 4035A press

Atl,iust the

Try CJCII

distortion.

(‘heck \witch l)o;~rcl (they

llccc\,al‘).

AC Calibrator to 2.45

the 4035A change

filter and

the notch

DISPLAY to

LEVEL FREQUENCY to NOISE.

verify

filter

capacitors

pick up noise

change l-ram

Vrms(+IO dBm)

each C;ISC

that a

(A3CO2. A3CI

when

too

TRMT to

at I

rcctificd sincw;Ivc appears

00.

close).

and A3CI

Bcntl

RC:V.

kHz.

A rcctificcl

the

capacitors

4 I);

sincwavc

they

must

away

from

should

A3TP23

Ican away

the

appear.

with no visual

from

switch board

the

Model

45X1511

5-17. Notch Filter Adjustments

REP‘l’R~N(‘E:

A:1

Receiver Assembly

b:Q1JlI’MICN’1’:

Adjustment/Calibration

ADJUSTMENTS

I’RO( ‘El)1 JIG::

8).

;I.

10.

I~:xternally

Set

left

display reads approximately 0.0

Press

Move the

(‘onnect

Adjust

(‘h;inge

(:onnect

Adjust

Oscilloscope . . . . . .

loop the TRMT jack to the RCV jack.

19:GA

select:

IlISPI,AY

MEASUREMENT . . . .

thr

displayed frequency on the right display to

I)ISI’I.AY

JU5

an Oscilloscope to

RIO2 (995

the frequency to 1010 Hz using STEP

Oscilloscope to

AIRI 32 (

. . . . . .TRMT

IXVI31,

995

Hz. Adjust the

dRm.

to select RCV mode.

shorting bars to the right (short pin 5 to 12, 6 to 11, 7 to

5175

pin 1.

Hz) for minimum AC signal on the Oscilloscope.

1JP

button.

JIJ5

pin 4.

1010 Hz) for minimum AC signal on the Oscilloscope.

F‘RICQUENCY

OUTPIJT I,EVEL

HP 1741A

10,

and 8 to

until the

9).

11.

1%.

1 :j.

14.

Change 49X4

(:onnect

Adjust

Move

oscilloscope probe to

A:iRl X0 (

JIJ5

shorting bars to original positions (shorting pins 1 to 16, 2 to 15, 3 to 14, and 4 to

frequency to

1025 Hz) for minimum AC signal on the

1025

Hz using STEP

TI’7.

1JP

button.

Oscilloscopt~.

13).

5-7

Adjustment/(:alihration

Model 4935A

ADJUSTMENTS

5-18.

flEfJEf<fSN(:E

f%JlJIf’MEN’f

Al3 P/AR Filter and Latch Adjustments (Options 002 and 003)

AI:! f2eceiver

()n

the Oscilloscope select A vs H operation and connect the probes to the normal input jack.

il.

1’.

(1.

Externally loop the

Select I,EVF:I, FREQIJENCY

Assembly

Oscilloscope . . . .HP

fj’or

HP model 180 series oscilloscopes, f’eed one input to channel A and the other to the

external horizontal input - not the external trigger input. This setup will display lissajous

If’ an adjustment is needed, a rising slope oval waveshape is produced.

When adjusted, a single diagonal line will appear.

4935A

TRMT and RCV

measurement mode.

pattens

which are used to adjust the P/AR filter.

310

jacks.

174112

with

I:1

probes

Srt

the

!i.

10. Stblect P/AR

II.

Adjust the Set the Oscilloscope to 0.2 volts per division.

Tf’15

Adjust Al

Move Oscilloscope channel A probe to

Adjust

49:EA

pin 7.

AlZIK175 (I’AR I’HASK 2)

A13R186 (f’AR IlET)

frequency to

OIJTPUT IXVEI,

:IRlX~

(PAR PHASE 1) to obtain a 0 degree phase (close the waveshape loop).

measurement mode on the

1300

Hz.

for a left display of 0.0

(:onnect

TPI5

to obtain a 0

4935A.

until the display reads 100.

dBm.

channel A to

degree

phase difference.

TP15

pin 2 and channel B to

Moclcl 4035A

Atljustmc~it/Calibl’ntion

ADJUSTMENTS

BNC TO BANANA PLUG

FIGURE 5-3. Hold Circuit Adjustments

AC-DC’ Voltmctcr

3455.A Milliammctcr - I-IP 3466A I’OWCI. Supply -

C’onncct ccfuipmcnt ;I$

Chcch

the power suf~ply

4035A sclcct:

HP 62 I HA

shown in

output

\vith the

Figure 5-3.

Voltmctc~~. All,iust the outf~ut

h.9V +.2

VDC.

DISPLAY - TRMT NOR -

f,rcss

SET

Cl1 - press

Ad.iust AZR53(TRMT

011

the 4935A prws iu the

Ad&t A2R73(RCV

Rc\~crsc the f’o\vcr wpply IKICIS.

TRMT

;~ncl

RC’V

in TRMT HOLD

press

f-101-D) to

IOLD)

IHOLD

circuit\.

RCV

HOLD

curr~cnl

REV button.

DC current reading of

The

Rclurn

the

rcacling of- 24.0mA

24.0111A 2.1 11lA.

current rcatlings

should bc

po\\cr suf>fdy Icads

+.I

24.OmA +.ImA

the

normal polarity.

in both

the

Set the nionitoriiig Voltmclcr 5OVDC’. l’hc

1’1~s

the

DC‘

NOR

currx~ll

rcxling

Ibutton. The

to ;I

vollagc range or 5OV

should bc

current dioulcl bc less

less

than

2hmA.

than

grcatcr

26mA.

and adjust

the Power Supfdy

j-‘),‘(5-I

0 BLANK)

for

Model

4935A

6-1. INTRODUCTION

Replaceable Parts

SECTION VI

REPLACEABLE PARTS

6-2.

Table

exploded views of the instrument.

6-3.

6-4. description, quantity (total used in the instrument), HP Part Number and manufacturers’ part number. Chassis and mechanical parts are also listed in Table 6-3 and Figures 6-1, 6-2 and 6-3.

This section contains information for ordering replacement parts. Table

6-2

is the Manufacturer’s Code List, and Table 6-3 lists replaceable parts. Figures 6-1,6-2, and 6-3 are

6-1

lists abbreviations,

REPLACEABLE PARTS LIST

Table

6-t%

is the list of replaceable parts with parts listed in alphanumerical order. Included is the

6-5. ORDERING INFORMATION

6-6.

order to the nearest Hewlett-Packard Office. When ordering a non-listed part include the instrument model number, serial number and a description and function of the part. Address the order to the nearest Hewlett- Packard Office.

To order a listed part, quote the HP Part Number, indicate the quantity needed and address the

6-1

Table 6-1. Reference Designations and Abbreviations (I of

ET C CB

CR DL

FL J

ADD

ADJ

ASM

ASSY

BCD

BeCu

BIN

BLK black

BLU blue

BP band pass

BRN brown

BRS

BTU

CATH cathode

ccw

CD PL

CER

CERMET

CKTS

C FLM carbon

CLK clock

CLR clear

CMOS complementary metal

COM

COML

COMP

COMPL

COND conductor

CONN connector

CONT contact

CPRSN

CTL

DEPC

ampvres

,Illrrrlaflnq c”lre”t

,tddrl% ,tdJ”<t. adlustment dlumlnum

wtulred alqorlthmlc assembly

thea!

btnary

coded decimal

bervlllum blnatv

brasr

Brrtlrh

collector

counterclockwise cadmium celamlc

ceramic

ClrCUltS

oxide semlconductor logic

common

commercial composltlon

complete

comprewon

complementary-

transistor logic

clockww!

dtameter

= direct

depost

copper

thermal

plate

met flm

film

current

ted carbon

state

machlnr,

“nit

REFERENCE DESIGNATIONS

L M OE P

0 R

RT S

T TB TP

DIA DIP

DPDT DPST DR DRVR DSPL DTL

ECL

ELECT

ENCAP

EXT external

EXTR extractor

F FF FLM FRNT FXD

G GE GL GND GP GRA GRN

HDW HEX HP HR HZ

ID IF IN.

INCAND INCL INSUL =

INT = Internal

INTL

jumper

relay

Inductor

meter optical

rncoder

plug connector

transistor reslstor thermistor switch

transformer

terminal

board

test

point

ABBREVIATIONS

diameter

dual

on-lane

double-pole, double-throw double-pole,

drive driver dlsplav dtode~translstor

emitter emitter-coupled logic electrolvtlc

encapsulated

female, farads

flip-flop film

= front

flxed

glga IlOg)

germanlurn

glass

groundfed)

General Purpose

vav

green

henries

hardware

hexagon, hexagonal. SIX =

high

= hour(s)

= Herr7

Integrated

InsIde dtameter

lntermedtate

= Inch. Inches

= Incandescent

Include(s) Insulation.

= Internal

package

pass

Insulated

slngle-throw

logic

ctrcult

frequency

VR voltage regulator W

LED LFT LG LH left hand LKWR lockwasher LP

LSB

METFLM-

MET OX MHZ = MFR

MINTR : MISC

MOM MOS MSB MTCHD MTG MTLC

N.C

NE NO

NPN

NPO

NRFR

NSR NYL

OBD

ORN

Integrated

non-repaIrable

vacuum tube, photocell, etc.

lumper

socket

crystal

tuned

kilo (1031, ktlohm

hght emltttng diode

left long

low

low power Schottky least

mlllt (10-3). mega (

metal metal megahertz manufacturer

mlnlature miscellaneous

momentary

metal most

matched

= mounting

metallic

nano (10.‘)

normally closed, no

connectton

neon

number

normally open

= No

1 negatwe-posItwe-negatwe

= negattve-posItwe

temperature

= not recommended for

field

normally

nanosecond

= not separately replaceable

= nylon

= order by

outslde diameter

orange

cIrcult,

assembly

wre.

cable assembly

cavity,

network

pass

slgnlflcant bit

male,

061, megohm

film

oxide

oxide semxonductor

slgnlftcant bit

Polarity

coefflclentl

replacement

shorting.

descrlptlon

zero (zero

Keplaceahlc Parts

P PC PCA

PIV

PK PNL

PNP PP PPM

POLYC

POLYE

FOLYSTY

PORC

POSN

POZI

PRV

PWV

P/O

RAM ROM RECT RF

RH RMS RND RT

RTL

RTNT

RTRY

I>IC” I1 012) pllltt’d ~‘irclllf pr,rltPd I:lrCUIt atsrmt,ly ~,lcofJl‘rd Pc>lk ln\w:rsc Voltayc ,,P d

p‘lrlr~l

p”\IlI”P “eqatlvr~posltl”r

przak-to

peak

p<1lrrs p,‘r mllllon poivtartmnate polyvthylene poivstyrenr

Table 6-1. Reference Designations and Abbreviations (2 of

ABBREVIATIONS

RVT RWV reverse

s Sf3

SCR SE SGL

SHK SIP SKT SLDR SPCG SPDT SPST SST STL

T TA TEL TC

THKNS

TGL THD THK

TOL TRMR

ll”el

working

voltage

second slow blow

\tl,con

SrlPnlum

SIllCOn

,ocket

Temp. Compensated.

thickness

controlled

s1nqle

shank single

1n~11nu

package

solder

spacing single-pole. s,ngle-pole, slngll?~throw

stalnlt?ss-steel

steel

s,/e

111,

tantalum

telephone

temp coefflclenl

tltdmum logglr> thrt,ad thick tolerance

tr,mmer

double-throw

rectlfler

TRN TTL TYP

(PI

UF US

V VAR vco

VDCW

VI0

VNP

W watts WT ww

WHT

WIP =

WIV

WSHR

YE1

ZNR

<,‘I

turn transistor-transistor logic typlcal

rn,cro (lo-9 mIcrofarad mlcrowconds

volt(sl variable

voltage controlled

“SClllatOr direct

current

wolet no polarity voltage

weight

wrewound wh

I te

wiper

working Inverse

washer

tlrnes.

multiple

yellow

ZPllPl

phi,

phase

working

voltage

volts

ITEM

DESCRIPTION HP PART NO.

QUANTITY

8 9

1 2 3 4 5 6 7

Case; top half

,&;a;

Front Cover 5040-4469 Instruction Card 0493590018 Handle- Case

Cap- Handle Screw; Machine

Foot, Bumper

Screw; Machine Case; Bottom Half

Metal Rod

5040-4470 7120-5370 2520-0014 5041-6750

2520-0014

!!lw+ws

7205-0356

Spring- Handle 1460-2096

Figure 6-1. Exploded View Case and Covers

,,,

1 1

2 2 4 2

‘/

ITEM

DESCRIPTION

HP PART NO.

QUANTITY

1 2 Coax Cable

3 Shield; Metal Mounting 04935-00002 4 Cable 4 wire twisted 5060-7167

5 Switch Board Assy 6

7 8 Knob, Monitor Volume 0370-l 089 9 Key Cap White 5041-0201

10 Nut, Hex 2950-0087

Receiver Assy(Std) 04935-6000’S .,3 2.

Receiver

Assy(P/AR) 04935-6OOm -j 9

0493560009

04935- JO?&

Front

Panel(Std)

Front

Panel(P/AR) 04935-

Knob, Output Level

04935

0370-

iiibhl

P@+

&P’

Washer 5/16x.375 3050-l 288

1 1 1 1

1 1 1

1 12 Binding Posts(Dial Jacks) 1510-0131 2 13

14 Washer No. 6; 147 ID 3050-0100 15 Nut No. 6 2420-0023

17 Transmitter Assy(Std) 04935~60393c3/

Insulator

04936-40001

Washer, Flat 3050-0105 2

Transmitter

Figure 6-2. Exploded View Assemblies and Cables

Assy(P/AR)

04935-603#@ t-

Model

4935A

ITEM

18 Cable(Batt 19 Standoff, Plastic

20 21

Cable, Shouldered Fiber Washer

Transistor Insulator

DESCRIPTION

Opt Interconnect)

Recflran.

Interconnect

HP PART NO.

QUANTITY

8120-3181 5040-4467 8120-3126 3050-l 021 3

034450949 3

23 Nut,Hex No.4 Trans. MTG 0590-0663 3 24 Screw No. 4, MTG 2200-0521 2 25 Transistor Pwr (PO Item 17) 1853-05 12 3

26 Nut Hex

26A

Solder Terminal

2950-0006 0360-l 251

27 Lock Washer 2190-0027 28 Line Filter Module

91350284

29 Rear Panel Assy (Loaded) 04935-60108

Consists of ltems:26,26A,27,28

29,32,33,34,35,36

for Repair

Replacement only.

29A

30 Foot Rear

Rear

Panel(Unloaded)

04935-00001

50404471

Screw No.4 2200-O 143 3 32 Binding Post, Ground 151 O-0038 33 34 35 36

Screw Transformer MTG

Cover Transformer

Nut, Transformer MTG

Transformer,

2360-0242 4

7100-l 288

2420-0023 4

9100-4205

37 Standoff, Plastic 5040-4468 4 38 Nut, Hex 2950-0043 39 Nylon Washer 3050-l 114

‘i

i, I 4 ,.,<;“,‘L..

it/ yc - bO/ L

1 1 1 1 1

1 1 1

6-6

Figure 6-2. Exploded View Assemblies and Cables (Continued)

ITEM

DESCRIPTION

HP PART NO.

QUANTITY

2 3

Battery Assy

Screw

Washer

4 Screw 5 6

Battery Charger Board 04935430029 Receiver Assy(Std) 04935-60032 Receiver

7 8

9 10 11

Screw Shield; Metal MTG Insulator

Label - ID Cable: P/O Battery

Charger Board

04935-62904

2510-0103

3050-0001

2360-0117 3

Assy(P/AR) 04935-60034

2360-0370

04935-04701 04935-45401

04935-800 14

8120-3181

Figure 6-3. Exploded View Battery Option

4 4

6-7

Table 6-2. Manufacturer Code List

Model

49:EA

MFR NO.

‘,/>;‘ll’“’

,i;

I i

” /I 4:’

‘,‘9 ,‘;

$1,

“,

MANUFACTURER NAME

I,t 1’11 ‘,I~M~I:IJNDIII;IOR t’llOD I)t I’1

KDI I’YRIIt II n (.llHI’

A’iliLRNlr PI~clI)lil:l’, CO

Cl I>

[If XII

RNI I

SII Il:ONlX INC

l;Nt /

I’r:O/l I.El: IIfA CllRt

HAliHl’i !,i M,(:O~, IUI! tIARR,!, INll R,YI’, !iYNJI 1) iEl(

r:S 1:1113P

ADDRESS

ZIP CODE

Model

4935A

Replaceable Parts

efqrence

eslgnator

AIDI-DS40 A2c2

A2C3 P2c4 A2C5 0160-0576

A2C7 A2ClO Ax11

Ax12

A2C13 A2c14 0160-0576

A2Cl5 0160-0576

A2Cl6 0160.3878 A2c17 A2C52 0160.0576

A2C53 0180.0373 A2C54 A2C56 0160.3879 A2c57 AZC58

A2C72 Ax73

Ax74 A2C76 0160-3879 A2c77

A2c7a

A2CR51

A2cR71

A2DSl 1990.0649

A2DS2 1990-0540

A2DS3

A2DS4 1990-0540

A2DS5 1oom0540

A2Q4 1654-0643

A2Q8

A2051

A2Q52

A2Q53 1864-0575

A2055

Axl71

A2Q72 1854.0071

A2073 1654.0575

A2a75 1054-0575

A2R5 0757-0461

A2R6 0757.0288 A2Rl5 0757.0459

A2R18

Am19 0898.3132

P Part

umber

04935-60027 04935-see69

80010-8pQ1o

l,.~b”’

0160-0576 0160-0576 0

160-0302

0180.029 i Olao-0104 0180-2203 0180-2206

1060-0576

W-0576

01 W-3879 0160-0576

160-0576

0160-0576

0180-0373

0160.3879

W-0576

0160-0576

10064069 1906-0069 1826-0585

1826.0585

1 SW-0540

1890.0540

1880.0640 1990-0540

199fJ-0540

1990-0805

1251-6947

1252-I 134 1252-1134

1251-6947

1251-6537

1251.6537 1250-0257

18540643 18640575 1854-0071

1854-0575

0757.O461

Si LL

3 LED (SERVICE ONLY)

5 CAPACITOR-FXD 1 UF + -20% 5OVM) CER

2 2

2 1 1

Description

A2 -

SWITCHBOARD (All Units)

SWITCH BOARD (ALL UNITS) FRONT PANEL W/PAR

FRONT PANEL

CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD

CAPACITOR-FXD 1 UF + -10% CAPACITOR-FXD CAPACITOR-FXD 6OUF+ -10% GVCD TA CAPACITOR-FXD 6OUF+-10% 6VDC TA CAPACITOR-FXD

CAPACITOR-FXD .I UF + -20% 5OVDc CER CAPACITOR-FXD .I UF + -20% 5OVDC CER CAPACITOR-FXD IOCOPF +-20% IOOVDC CER CAPACITOR-FXD CAPACITOR-FXD .I UF + -2O% 5OVDC CER

CAPACITOR-FXD .68UF CAPACITOR-FXD .Ol UF + -20% 1 OOVDC CER CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD .lUF +-2V% 5OVDC CER

CAPACITOR-FXD .lUF +-20%

CAPACITOR-FXD CAPACITOR-FXD .Ol UF + -20% 1 CAPACITOR-FXD .OlUF+-2O% IOOVDC CER CAPACITOR-FXD .I UF

DIODE-FW DIODE-FW V REF TO-92 V REF TO-92

DISPLAY-AN-SEG I-CHAR ,408-H RED OISPLAY-NUM-SEG I-CHAR .43-H

DISPLAY NUM-SEG I-CHAR .43-H

DISPLAY-NUM-SEG I-CHAR .43-H

DISPLAY-NUM-SEG I-CHAR .43-H DISPLAY-NUM-SEG I-CHAR .43-H

DISPLAY-NUM-SEG I-CHAR .43-H

DISPLAY-LT BAR MDL

CONNECTOR-SGL CONT PIN

CONNECTOR-TEL JACK 2 =CKT CONNECTOR-TEL JACK 2 =CKT .25-SHK-DIA CONNECTOR-SGL CONT PIN CONNECTOR

CONNECTOR

CONNECTOR-RF TRANSISTOR NPN

TRANSISTOR NPN

TRANSISTOR NPN SI

TW\NSISTOR TRANSISTOR NPN SI ~0-825~~ FT=MMHZ

TRANSISTOR NPN SI TRANSISTOR NPN SI TRANSISTOR NPN SI TRANSISTOR NPN SI TRANSISTOR NPN 01

RESlSTOR68.lKl%.l25WFTC=0+-100

RESlSTORS.OSKl%.l25WFTC=0+-100

RESISTOR

RESlSTOR68.lK1%.l25WFiC=O+-lW

RESISTOR261

W/NTG

STD.-

.lUF

+-20% 5OVDC CER

.lUF +-20%

.018UF +-IO% 2ooVDC .lUF

+-20%

20JUF+75-10% 16VDC

.lUF

+-20%

.lUF +-20% 5OVDC

+-IO%

.OlUF +-20% ICOVDC

.lUF

+-20%

.6aUF+

-10% 35VCC TA

+-M%

BRDG

4WV IA

RRDG 4oOV

5l.lK

IA 28480

13.PIN

F POST NPE

13.PIN

PCISTTYPE

SMB M

2N3565

SI TO-66 PO = 35W

2N3585

SI TO-66 PO =

PD=625MW

NPN SI

PD-3OOMW FT.2WMHZ

PD-625MW PD-625MW

PD=3OOMW FT=2UOMHZ

PD=625MW

PO-625MW FT=6OMHZ

.125W

1%.125WFTC=Ot-100

fXlZ.OO3 ONLY)

I. 3’

c’r’,

5OVDC CER

35VlX

5OVDC CER

POLYE

SOVDC

CER

AL 56289

6OVDc

CER

35VCC TA

CER

5oVCC

CER

5OVDc

CER 28480

WVCC

CER

,025.IN-BSC

.PBSHK-DIA

.M5-IN-BSC

50.OHM

35W

FT=5OMHZ

FT=5OMHZ FT=5OMHZ

FT=5OMHZ

TC=O+-100

Efr

ode

28480 04935.60027 28480

28480

28480 28480

56289

28480

28480 01 W-0576 28480 28480 28480 28480

56289 28480

28480 0160-3879 28480 28480 016&O576

56289

28480

28480 0160-3879

28480

28480 0160-0576

28480

27014

28480 28480

28480

28480 28480

28480

28480 28480

28480

28480 26480 1252-1134

28480 1252-l 134 28480

28480 1251.6537

28480 1251.6537 28460 125 l-0257

01928

04713

28480 1854.W71

04713

28480

04713 MPSA42

o4713

24546

19701 24546 24546 24546

fr Part

umber

04935weea

04935-w

5082-4160

01600576

0160.0576

w-w20

160-0576

15ODl05X9035A2 300207G016DF2

E%iz%EE::

0180-0576

0160-0576

0180.3878 0160-0576 0160-0576

15oD684Kx9o3542

0160.3879

0160.0576

15OD684X9035PZ

0160-3879

180-0576

1906-0060

1006-0249 LM32ODZ LM329DZ

1990-0649 1 sso-0540

so-0540

SW-0540

1990-0540 1900-0540

m-0540

1980.0540

Iwo-0540 199o-0805

1251.6947

1251-6947

2N3585 2N3585

MPS-A42

MPSA42

MPS-A42 MPS-A42

1854.W71

MPS-A42

Gl-1 8-TO-6812-F

MF4

l/8-TO-9091-F

C4 = 1 /B-TO-51 12-F C4

l/8-TO-6812

C4 l/&TO-2610-F

See introduction to this section for ordering information.

* Indicates factory selected value

6-9

Replaceable Parts

Model 4935A

efqrence

eslgnator

A2R20 A2R21 A2Rz2 A2R23 0899-0657 A2R24 0699-0657

A2R25 A2R26

A2R27

A2R28 0757.0442

A2R29 A2R30 0757.0442

A2R35 A2R36 2100-3658 A2R51 AZR52

A2R53 A2R54 0698-3429 A2R56 A2R57 A2R58

AZR60 A2R71 A2R72 A2R73 2100-3164 A2R74 0696-3429

A2R76 A2R77 A2R78 Azmo

A2Sl A2s2 A2S3 3101-2391 A2s4 A2s5

A2S6

A2S7

Et A2SlO

A2Sli

As12

A2s13 A2SGl

AZSG2 AZSPI A2TP3

A2TP4 A2u2

A2u3 A2u4 AZU6 KJU7 1*2t3-0712

AzXOSl AZXDSP AZXDS3 A2xDS4 AZXDSS

A2XDS6 A2XDS7 A2XDS8 AZXDS9 AZXDSlO

P Part

umber

0757.0442

0698.8558 tx98.8558

0699-0658 0699-cc-s

0757.0346

0757.0447

2100-3657 0698-8827

0757-019s 2100-3164 0757-0401

0757-0401

0757.0401 0757-0401

06984827

0757.0199

0757.0401 0757-0401 0757-0401 0757-0401

3101.2124

3101-2391

3101-0499

3101-0499 3101-0499

3101-0499

3101.0499 3101-0499 3101-0499

3101-0499 3101-0499 3101-0499

1970-0078

160-0273

1251-6947

1820-2132

1820.2

1626-0205

1826.0682

12flO-0915

1200-0915

1200-0915 12amJ915

1200.0915

1200-0915

1200-0915 1200-0915 1200-0915

1200.1320

132

8 :

5 5

4 9

ii :

0 0

0 4 3 9 2

0 2

5 5

0”

a 0

0 4

7 4

;

3 3 3

QtY

3 2

2 1

Description

RESISTOR RESISTOR RESISTOR

RESISTOR 300.25% RESISTOR 450.25%

RESISTOR 460.25% RESISTOR

lOK1%.125WFTC=O+-100

67.3.25% .5W

RESISTOR 300.25%

RESlSTORl01%.l25WFTC=0+-100

RESISTOR RESISTOR

RESISTOR-VARIABLE 1 OK + -20%; SPECIAL RESISTOR-VAR CONTROL CP 5OK

RESlSTORlM1%.l25WFTC=0t-lW RESlSTOR21.5K1%.125WFTC=0+-lW

RESISTOR-TRMR 10 RESISTOR 19.6 RESISTOR100 RESISTOR RESISTOR 100

RESlSTOR1W1%.125WFTC=0+-100 RESlSTORlM 1%.125WFTC=O+-100 RESlSTOR215K 1%.125WFTC=O+-100

RESISTOR-TRMR 10 RESISTOR 19.6

RESISTOR RESISTOR RESISTOR

SWITCH-PB DPOT ALTNG SWITCH-PB Z-STATION 15MM C-C SPACING SWITCH-PB P-STATION 15MM C-C SPACING

SWITCH-P6 5.STATION iOMM

SWITCH-P6 5.STATION IOMM

SWITCH-PB

TUBE-ELECTRON SURGE V PICTR TUBE-ELECTRON SURGE V PICTR

67.3.25% .5W .5W .5W

.5W .5W FTC=O+-50

IOK

.125W

16.2K 1%.125W IOK

.125W FTC=O+-100

20%

1%.125W FTC=O+-100

1%.125WFTC-Ot-100

100 1%.125W FTC-Ot-100

1%.125WFTC-Ot-100

20%

1%.125W FTC=O+-100

RESISTOR

SWITCH-PB

SWITCH-PB SWITCH-PB SWITCH-PB J-STATION 1OMM C-C SPACING

SWITCH-PB J-STATION IOMM C-C SPACING SWITCH-PB

LOUD SPEAKER CONNECTOR SGL CONT PIN

CONNECTOR SGL CONT PIN

IC ORVR CMOS LED OFIVR

IC DRVR CMOS LED DRVR IC TIMER

IC OP AMP LOW-BIAS-H-IMPD DUAL SOCKET-DSPL 14.PIN DIP-SLDR

SOCKET-DSPL 14.PIN DIP-SLDR SOCKET-DSPL 14.PIN DIP-SLDR SOCKET-DSPL 14.PIN DIP-SLDR SOCKET-DSPL 14.PIN DIP-SLDR

SCCKETDSPL 14.PIN

SOCKET-OSPL 14.PIN DIP-SLDR SOCKET-DSPL 14.PIN DIP-SLDR SOCKET-DSPL 14.PIN DIP-SLDR SOCKET-DSPL

100 1%.125W FTC=O+-100

100

100 1%.125W FTC=O+-100

100 1%.125WFTC=O+-IW

5.STATION IOMM

5.STATION 1OMM

5.STATION lOMt.4

5.STATION 1OMM

5.STATION IOMM

lTL

AUDIO AMPL PWR

&PIN

.125W FTC=O+-100

DIP-SLDR 28480

DIP-SLDR

TC=O+-50

F TC = 0 +

-50

TC=O+-50

F TC-O+-50

TC-Ot-100

TC=O+-100

20%

IOCW

SIDE.ADJ 17.TRN

SIDE-ADJ 17.TRN

.25A

1 1JVAC

C-C SPACING

C-C SPACING C-C SPACING

C-C SPACING 28480

,025.IN-BSC 28480 ,025.IN-BSC

B-DIP-P

PKG

&DIP-P

ode

Ffr

24546 28480 284&J

28480 28480

28480

24546

28480 21 W-3857

28460

28480

24546

02111

03888

24546

28480

24646

02111

03888

24546 24546 24546 24546

26460

28480 28480 3101-2391

28480 3101-0499

28480

25088

25088 Bl-A350/15

28480

32293

a324 27014 27014

28480

28480 28480

28480

28480 28480 28480 28480

fr Part

umber

C4-l/8-TO-1002-F 0698-6558 0698-8558 0699-0857

0699.0657 ce99-0858

0699-0658 C4-1 /&TO-IORO-F C4-i/8-TO-1W2-F C4-l/8-TO-1622-F

C4-1 .&TO-l WZ-F ZIW-3856

0698-6827 C4-l/&TO-2152F

43PlW PME55-1 /&TO-19R6-F C4-l/8-TO-101-F C4-l/8-TO-101-F C4-l/8-TO-101-F

C4-l/8-TO-101-F

0698.8827 C$;l~TO-2152-F

PME55.l/8-TO-19R6-F

C4-1 /a-TO-101-F C4-l/8-TO-101-F C4-l/8-TO-101-F

C4-l/8-TO-101-F

3101-2124

3101-2391

3101-0499

3101.0499

Bl-A350/15

9160-0273

1251.6947 125 l-6947

ICM7218A

NE55EA

LM386N-1

LF353N

12W-0915 12owx15

1200.0915 1200-0915 1200-0915

;gg:g:g

12ixm915 12w-0915 1200-1320

6-10

See introduction to this section for ordering information.

* Indicates factory selected value

Model 4935A

Replaceable Parts

P Part

umber

0340-os92 03m-1013

2200-0173

2280.OOOB 236cOlB7

0590-0076 6041-0201 5041-1931 6041-ID32 5041-1933

6041-1934

ml-Is35 5041-ID36

5041.IS38 5041-1s38

04935.61603 21sO-0138

2 2

4 4

1 1

1 2

2 1

Description

AZ MISCELLANEOUS PARTS

INSULATOR TRANSISTOR SPACER-RND SCREW-MCH NUT-HEX-W SCREW-MCCI6.32.375IN-LG PAN-HDFOZI

KEY CPA-DIAL KEY CAP-HOLD (SETUP-TRMT-R

KEY CAP-800 KEY CAP-BOO SETUP-TRMT-R

TWISTED WASHER FLAT

.BS8-IN-LG .I 15-IN-ID

4-40 I-IN-LG

LKWR

(SETUP-TRMT)

SETUP-TRMT-R

PAIRJMPR

82 DEG

4.40.THD .OB4-IN-THK

fr Part

prfr

ode

28480

z oooo0 00000

omlo

28480

28460 26460 28480

26480

28480

28480 28480

28480 0493561603

woo0

umber

0340-0892 ORDR BY DSCRPTN ORDR BY DSCRPTN

ORDR BY DSCRPTN ORDRBYDSCRPTN

ORDR BY DSCRPTN 5041-02ul 5041-1931 5041-1932

5041.ID33 5041-ID34

5041-IS36 5041-is36

5041.1938

5041.1839

ORDR BY DSCRPTN

See introduction to this section for ordering information.

* Indicates factory selected value

6-11

HP 4935A Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual