Agilent Technologies e4419b, e4418b User Manual

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Service Guide

Agilent Technologies

E4418B/ E4419B Power Meters

Agilent Technologies Part no. E4418-90059

Revision C

September 2003

permission is prohibited, except as allowed under the copyright laws. Printed in the UK.

ii Agilent E4418B/E4419B Service Guide

Legal Informat io n

Legal Information

Notice

Information contained in this document is subject to change without notice. Agile nt Technologies makes no warranty of any kind with regard to this material, including, but not limite d to, the implied warranties of mercha ntability and fitness for a particula r purpose. Agilent T echnologies shall not be liable for errors contained herein or for incidental or consequential damages in conn ection with the furnishings, performance, or use of this material. No part of this document may be photocopi ed, reproduced, or tr anslated to another language without the prior written consent of Agilent Technologie s.

Certification

Agilent Technologies certifies that th is product met its published specifications a t the time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute’s calibration facility, and to the calib ration facilities of other International Standards Or ganization members.

Warranty

This Agilent Technologies instrument pr oduct is war ranted a gainst de fe cts in ma teria l and workmanship for a per iod of one ye ar f rom date of shipm ent. During the war ranty period, Agile nt Technologies will at its opt ion , eith er repai r or repla ce produc ts whi ch prove to be defective. For warranty service or repai r, this product must be returned to a service facility designated by Agilent Technologies. Buyer shall prepay shipping charges to Agilent T echn ologies and Agile nt T echnologi es shall pay shippi ng char ges, duties, and taxes for products returned to Agilent Technologies from another country. Agilent Technologies warrant s that its software and firmware designated by Agilent Technologies for use with an instrument will execute its programming instructions when properly ins talled on that instrument. Agil ent Technologies does not warrant that the operation of the instrument, or firmware will be uninterrupted or error free.

Agilent E4418B/E4 419B S ervice Guide iii

Legal Information

Limitation of Warranty

The foregoing warrant y sha ll not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorize d modi fication or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND E XCLUSIVE REMEDIES. HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

iv Agilent E4418B/E4419B Service Guide

Equipment Operation

Warnings and Cautions

This guide uses warnings and cautions to denote hazards.

WARNING A warning calls attention to a procedure, practice or the like, which, if

not correctly performed or adhered to, could result in injury or the loss of life. Do not proceed beyond a warning until the indicated conditions are fully understood and met.

Caution A caution calls attention to a procedure, practice or the like which, if not

correctly perf orm ed or adhered to, could result in damage to or the destruction of part or all of the equipment. Do not pr oce ed beyond a caution until the indicated conditions are fully understood and met.

Personal Safety Considerations

WARNING This is a Safety Class I product (provided with a protective earthing

ground inco r p o ra t ed in the pow er co rd ). The main s p lu g sh a l l onl y be inserted in a socket outlet provided with a protective earth co nt act. Any interruptio n of the protective conductor, inside or outside the instrument, is likely to make the instrument dangerous. Intentional interrup t ion is prohibited . If this instrument is not used as specified, the protection provided by the equipment could be impaired. This instrument must be used in a normal condition (in which all means of protection are intact) only. No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers. For continued protection against fire hazard, replace the line fuse(s) only with fuses of the same type and rating (for example, normal blow , time delay, etc.). The use of other fuses or material is prohibited.

Agilent E4418B/E4 419B S ervice Guide v

Equipment Operation

ISM

General Safety Considerations

WARNING Before this instr u m en t is s w i t ched on, ma k e su re it has been prop erly

grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact. Any interruption of the protective (grounding) conductor, inside or outside the instrument, or disconnection of the protectiv e earth terminal can result in personal inju ry.

Caution Any adjustments or service procedures that require operation of the

instrument with protective covers removed should be per formed only by trained service personnel.

Markings

The CE mark shows that the product complies with all the relevant European legal Directives (if accompanied by a year, it signifies when the design was proven.

Group 1 Class A

vi Agilent E4418B/E4419B Service Guide

This is the symbol of an Indust rial Scientific and Medical

Group 1 Class A product.

The CSA mark is a registered trademark of the Canadian Standards Association.

External Protective Earth Terminal.

While this is a Class I product, provided with a protectiv e earthing conductor in a power cord, an external protective earthing terminal has also been provided. This terminal is for use where the ea rthing c annot be assured . At lea st an 18AWG earthing conductor should be used in such an instance, to ground the instrument to an assured earth terminal.

Equipment Operation

IEC 1010-1 Compliance

This instrument has been designed and tested in accordance with IEC Publication 1010-1 +A1:1992 Safet y Requi rements for Electrical Equipment for Measur ement, Control and L aborat ory Use and has be en suppl ied in a sa fe condi tion. The i nstruc tion documentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain the instrument in a safe condition.

Statement of Compliance

This product has been designed and tested for compliance with IEC 60529 (1989) Degrees of Protection Provided by Enclosures (IP Code). Leve l IPx 4 is attained if, and only if, the carry ca s e (Agilent part number 34141A) is fitted.

User Environment

This product is desi gned for use in a sheltered environment (avoiding extreme weather conditions) in accordance with Pollution De gree 3 defined in IEC 60664-1, with the carry case ( Agilent part number 34141A) fitted over the inst rument.

The product is suitable for indoor use only, when this carry case is not fitted.

Installation Instructions

To avoid unnecessary over-temperature conditions, while this carry case is fitted do not apply an ac mains suppl y volt age, only operat e your power mete r from the batt ery pack.

Agilent E4418B/E4 419B S ervice Guide vii

List of Related Publications

List of Rel ate d P ub li c ati on s

The Agilent E4418B and Agile ntE4419B User’s Guides are also available in the following languages:

• English Langua ge Us er’s Guide - Standard

• German Language User’ s Guide - Option ABD

• Spanish Language Use r’s Guide - Option ABE

• French Language User’s Guide - Option ABF

• Italian Language User’s Guide - Option ABZ

• Japanese Language User’s Guide - Option ABJ

Agilent E4418B/E4419B Service Guide is available by ordering Option 915. Agilent E4418B/E4419B CLIPs (Component Location and Information Pack) is

available by ordering E4418-90031.

viii Agilent E4418B/E4419B Service Guide

Sales and Service Offi ces

Sales and Service Offices

For more information about Agilent Technologies test and measurement products, applications, services, and for a current sales office listing, visit our web site: http://www.agilent.com

You can also contact one of the following center s and ask for a test and measurement sales representative.

Asia Pacific:

Agilent Te chnologies 19/F, Cityplaza One, 1111 King’s Road, Taikoo Shing, Hong Kong, SAR (tel) (852) 2599 7889 (fax) (852) 2506 9233

Japan:

Agilent Technologies Japan Ltd. Measurement Assistance Center 9-1, Takakura-Cho, Hachioji-Shi Yokyo, 192-8510 (tel) (81) 426 56 7832 (fax) (81) 426 56 7840

Australia/New Zealand:

Agilent Te chnologies Australia Pty Ltd 347 Burwood Highway Forest Hill, Victoria 3131 (tel) 1-800 629 485 (Australia) (fax) (61 3) 9272 0749 (tel) 0 800 738 378 (New Zealand) (fax) (64 4) 802 6881

Canada:

Agilent Technologies Canada Inc. 5150 Spectrum Way, Mississauga, Ontario L4W 5G1 (tel) 1 877 894 4414

Agilent E4418B/E4 419B S ervice Guide ix

Sales and Service Offices

Europe:

Agilent Te chnologies Test & Measurement European Marketing Organization P. O. Box 999 1180 AZ Amstelvee n The Netherlands (tel) (31 20) 547 9999

Latin America:

Agilent Te chnologies Latin American Region Headquarters 5200 Blue Lagoon Drive, Suite #950 Miami, Florida 33126 U.S.A. (tel) (305) 267 4245 (fax) (305) 267 4286

United States:

Agilent Te chnologies Test and Measurement Call Center P. O. Box 4026 Englewood, CO 80155-4026 (tel) 1 800 452 488

In any correspondence or telephone conversations, refer to the power sensor by its model nu mber and f ull s erial n umber. With t his i nformation, the Agi le nt T echnologies representative can quickl y determine whether your unit is still within its warranty peri od.

x Agilent E4418B/E4419B Service Guide

Sales and Service Offi ces

Returning Your Power Meter for Service

Use the information in this section if you need to return your power meter to Agilent Technologies.

Package the Power Meter for Sh ipment

Use the foll owing steps to package the power meter for shipment to Agilent Technologies for service:

1. Fill in a blue ser vice tag (available at the end of this guide) and attach it to the power meter. Please be as specific as possible about the nature of the problem. Send a copy of any or all of the following information:

n A n y erro r mes s ag es that appeared on th e p ow er m et er dis p l ay. n Any information on the performance of the power meter.

Caution Power meter damage can result from using packaging materials other than

those specified. Never use styrene pellets in any shape as packaging materials. They do not adequately cushion the power meter or prevent it from shifting in the carton. Styrene pellets cause power meter damage by generating static electricity and by lodging in the rear panel.

2. Use the original packaging materials or a strong shipping con tainer that is made of double-wall ed, corrugated cardboard with 159 kg (350 lb) burstin g strength. The carton must be both large enough and strong en ough to accommodate the power meter and allow at least 3 to 4 inches on all sides of the power meter for packing material.

3. Surround the power meter with at least 3 to 4 inches of packing material, or enough to prevent the powe r meter from moving in the carton. If packing foam is not available, t he best alternative is SD-240 Air Cap

from Seal ed Air Corporation (Commerce, CA 90001). Air Cap looks like a plastic sheet covered with 1-1/4 inch air filled bubbles. Use the pink Air Cap to reduce static electricity. Wr ap the power meter several times in the material to both protect the power meter and prevent it from moving in the carton.

4. Seal the shipping container securely with strong nylon adhesive tape.

5. Mark the shipping container “FRAGILE, HANDLE WITH CARE” to ensure careful handling.

6. Retain copies of all shipping papers.

Agilent E4418B/E4 419B S ervice Guide xi

About this Guide

Chapter 1: Specifications

This chapter li st s the power meter’s specifications and describes how to interpret these sp ecifica ti o n s .

Chapter 2: Performance Test s

This chapter contains procedures which allow you to tes t the power meter’s electrical performance to it’s specifications.

Chapter 3: Adjustments

This chapter conta ins checks and adjustments that ensure proper performance of the power meter.

Chapter 4: Theory of Operation

This chapter describes how each of the power meter’s individual assemblies operate.

Chapter 5: Replaceable Parts

This chapter detai ls the power meter’s replaceable parts. It also explains how to assemble and dis assemble the power meter.

Chapter 6: Trou blesho oting

This chapter con tains troubleshooting flow charts designed to isolate faults in the Rmt I/O, GP-IB and RS232/422 interface ports.

Appendix A: “Measurement Uncertainty Analysis – Instrument Accuracy Test”

Appendix B: “Measurement Uncertainty Analysis – Power Refere nce Level Test”

xii Agilent E4418B/E4419B Service Guide

Tab le of Contents

Specifications....................................................................................... 1

Introduction ................................................................................... 1-2

Power Meter Speci fications.......... ............ ............ ....................... .1-3

Meter....................................................................................... 1-3

Accuracy.................................................................................. 1-4

1 mW Power Reference .......... ........................ ............ ............1-5

Power Meter Supplemen t a l Char a ct eristics ............................... 1-6

Measurement Speed............................................................... 1-6

Zero Drift of Sensor s ................. ....................... ...................... 1-6

Measurement Noise................................................................ 1-7

Settling Time....... ............ ........................ ............ ................... 1-9

Power Sensor Speci f i ca t i o ns....... ............ ............ ................... 1-12

Battery Option 001 Operat ional Cha rac teris tics .... .................... 1-13

General Characteristics............................................... ................. 1-14

Rear Panel Connectors......... ............ ........... ........................ ... 1-14

Environmental Characteristics........................................ ........... .1-15

General Condition s........................... ....................... ............ ... 1-15

Operating Environment......................................................... 1-15

Storage Conditions ................................................................. 1-15

General.......................................................................................... 1-16

Dimensions ............................................................................. 1-16

Weight..................................................................................... 1-16

Safety ......................................................................................1-16

Remote Programming ............................................................1-17

Non-Volatile Me mory.................... ........................ ............ ..... 1-17

Page

Performance Tests.............................................................................. 1

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

Equipment Required .............................................................. 2-3

Performance Test Record....................................................... 2-4

Performance Tests..................................................................2-4

Calibration Cycle....................................................................2-4

Test Procedures ...................................................................... 2-4

Zero Test............ ....................... ............ ........................ ............ ..... 2-5

Specification ........................................................................... 2-5

Description.............................................................................. 2-5

Agilent E4418B/E4 419B Service Guide Contents-1

Equipment .............................................................................. 2-5

Test Setup ............................................................................... 2-5

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

Instrument Acc ur a cy Te st....................... ............ ........... ..............2-7

Specification........................................................................... 2-7

Description.............................................................................. 2-7

Test Procedure 1..................................................................... 2-7

Equipment .............................................................................. 2-7

Test Setup ............................................................................... 2-8

Procedure................................................................................2-8

Test Procedure 2..................................................................... 2-11

Equipment .............................................................................. 2-11

Test Setup ............................................................................... 2-11

Procedure................................................................................2-12

Power Reference Lev el Te st ......... ............ ............ ....................... 2-15

Description.............................................................................. 2-15

Equipment .............................................................................. 2-17

Test Setup ............................................................................... 2-17

Procedure................................................................................2-17

Agilent E-Series Power Sensor Interface Test............................ 2-19

Procedure................................................................................2-19

Agilent E-Series Power Sensor Funct ional Test......................... 2-20

Description.............................................................................. 2-20

Equipment .............................................................................. 2-20

Procedure................................................................................2-20

Performance Test Record..............................................................2-23

Adjustments.......................................................................................... 1

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

Safety Considerations ............................................................ 3-2

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

Post-Repair Adju s tments........ ........................ ....................... 3-3

Power Reference Oscillator Frequency Adjustment ................... 3-4

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

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

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

Power Reference Oscillator Level Adjustment............................ 3-6

Description.............................................................................. 3-6

Equipment .............................................................................. 3-8

Procedure................................................................................3-8

Measurement Uncertainty..................................................... 3-10

Display Brightn es s and Contrast Adjustment....... ..................... 3-11

Introduction ............................................................................ 3-11

Contents-2 Agilent E4418B/E4419B Service Guide

Procedure................................................................................ 3-11

Theory of Operation........................................................................... 1

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

A1 Power Supply/Battery Charger ...................... ........................4-3

A2 Processor Assembly...................................... ........................ ... 4-4

A3 Front Panel Assembly...... ............ ........................ ................... 4-7

A4 Comms Assembly ........ ............ ........................ ....................... .4-8

A5 Daughter Assembly......................................... ....................... .4-9

A6 Measurement Assembl y.......... ........................ ....................... .4-10

A8 Rechargeable Battery Ass emb l y............................................. 4-12

Replaceable Parts............................................................................... 1

Introduction ................................................................................... 5-2

Assembly Part Numbers ............................................................... 5-3

Power Supply Assembl y Typ es............................... ............ ... 5-5

Front Panel Connector Repair.....................................................5-6

Firmware Upgrades.......... ............ ........................ ............ ............5-7

Downloading Firmware.......................................................... 5-7

Assembly and Disassembly Guidelines ....................................... 5-8

Removing the Power Meter Cover.........................................5-8

Removing the A1 Power Supply Assembly........................... 5-9

Removing the A2 Processor Assembly...................................5-10

Removing the A4 Comms Assembly...................................... 5-11

Removing the A5 Daughter or A6 Measurement Assemblies5-12

Removing the A7 Fan Assembly ............................................ 5-13

Removing the Power Meter RAM Battery (BT1).................. 5-14

Removing the A3 Front Panel Assembly............................... 5-15

Replacing the Front Panel Power Reference Cable Assembly.5-18

Replacing the Rear Panel Power Sensor Cable Assemblies

(Options 002 and 003) ............................................................ 5-19

Replacing the Rear Panel Power Reference Cable Assembly

(Option 003) . ........................................................................... 5-21

Replacing the Rear Panel Recorder Output Cable Assembly.5-22

Replacing The Chassis Assembly ......................................... .5-23

Troubleshooting.................................................................................. 1

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

Suggested Diagnost ic Equipment...... ............ ....................... .6-2

Measur ement Unc ertainty Analysis Instrument Accuracy Test1

Measurement Introduction........................................................... A-2

Uncertainties..........................................................................A-3

Define the Measurand............ ........................ ............ ............A-3

Agilent E4418B/E4419B Service Guide Con tents-3

Define the Measurement Equati on.............. ........... ..............A-3

Sensitivit y Coeffi cients Ci:............. ............ ............................A-8

Combined Standard Uncer tai nty uc(y): ................................A-9

Expanded Uncertaint y kuc(y):.......... ............ ....................... ..A-9

Measur ement Unc ertaint y Analysis Power Re ference Level Test1

Measurement Introduction........................................................... B-2

Define the Measuran d...... ........................ ........................ ......B-2

Define the Measurement Equati on.............. ........... ..............B-2

Uncertainty Equation ............................................................B-4

Voltage Measurement s Uncertainty ......... ............ ................B-4

Mismatch ................................................................................B-5

Calibration factor ...................................................................B-7

Sensor Calibration Factor Drift.............................................B-7

Resistance...............................................................................B-8

Repeatability..................................... ......................................B- 8

Sensitivit y Coeffi cients (Ci) ................................... ................B-10

Combined Standard Uncer tai nty (uc(y)).................... ...........B-12

Expanded Uncertaint y............................... ........................ ....B-12

Contents-4 Agilent E4418B/E4419B Service Guide

Specifications

Introduction

This chapter details the power meter’s specificatio n s a nd supp le m ental characteristics.

Specifications descri be the warranted perfo rma nc e and apply afte r a 30 minute warm-up . The se specifications are valid over the power meter’ s operating and environmental range unless otherwise stated and after performing a zero and calibration.

Supplement al char act eristics, which are shown in italics, are inten d ed to provide infor m ation useful in applyin g the power meter by givi ng ty pi cal, but non-warranted performance parameters. These characteristics are shown in italics or denoted as “typical”, “nominal” or “approximate”.

For information on measurement uncertainty calculations, refer to Agilent

Application Note 64-1A, “Fundam e nt als of RF and Micro wave Power

Measurements”, Literature Number 5965-6630.

1-2 Agilent E4418B/E4419B Service Guide

Specifications

Power Meter Specifications

Meter

Frequency R ange

100 kHz to 110 GH z, power sensor dependent

Power Range

-70 dBm to +44 dBm (100 pW to 25 W), power sensor dependent

Power Sensors

Compatible with all Agile nt 8480 serie s pow e r sensors and Agilen t E-series powe r s e nsors.

Singl e Sensor Dynamic Range

90 dB maximum (Agilent E-series power sensors) 50 dB maximum (Agilent 8480 series power sensors)

Display Units

Absolute: Watts or dBm Relative: Percent or dB

Display Resolution

Selectable resolution of:

1.0, 0.1, 0.01 and 0.001 dB in logar ith mic mo de, or 1, 2, 3 and 4 significant digits in linear mode

Default Resolution

0.01 dB in logarithmic mode 3 digits in linear mo de

Agilent E4418B/E4419B Service Guide 1-3

Specifications

Powe r Me te r S p ecifications

Accuracy

Instrumentation

Absolute: ±0.02 dB (Logarithmic) or ±0.5% (Linear). (Refer to the power sensor linearity specification in your power sensor manual to assess overall system accu racy.) Relative: ±0.04 dB (Logarithmic) or ±1 .0% (Linear). (Refer to the power sensor linearity specification in your power sensor manual to assess overall system accu racy.)

Zero Set (digital settabi li ty of zero) : Power sensor dependent (refer to Table 1-1). For Agilent E-series power sensors, this specification applies when zeroing is performed with the sensor input disconnected from the POWER REF.

Table 1-1: Zero Set Specifications

Power Sensor Zero Set

Agilent 8481A ±50 nW Agilent 8481B ±50 µW Agilent 8481D ±20pW Agilent 8481H ±5 µW Agilent 8482A ±50 nW Agilent 8482B ±50 µW Agilent 8482H ±5 µW Agilent 8483A ±50 nW Agilent 8485A ±50 nW Agilent 8485D ±20 pW Agilent R8486A ±50 nW Agilent R8486D ±30pW Agilent Q8486A ±50 nW Agilent Q8486D ±30 pW Agilent V8486A ±200 nW Agilent W8486A ±200 nW Agilent 8487A ±50 nW Agilent 8487D ±20 pW Agilent E4412A ±50 pW Agilent E4413A ±50 pW

1-4 Agilent E4418B/E4419B Service Guide

Specifications

Power Meter Specifications

1 mW Power Reference

• Power Out p ut: 1.00 mW (0.0 dBm).

• Accur acy: (for two ye a rs )

±0.9% (0 to 55 ºC). ±0.6% (25±10 ºC). ±0.5% (23±3 ºC).

• Frequency: 50 MHz nomi na l .

•SWR

: 1.06 maximum (1.08 maximum for

option 003).

• Connector Type: Type N (f), 50 ohms.

1. National met rology institutes of member states of the Metre Convention, such as the National Institute of Standards and Technology in the USA, are signator ies to the Comi t é Inte r na tio nal de s Poids et Me su res Mutual Recognition Arrangem ent. Further information is available from the Bureau Interna tio na l de s Poids e t Me su re s, at ht tp :/ /w ww.bipm.fr/

2. This SWR specification is only warranted for the E4418B and the E4419B Power Meters with serial prefix GB4331xxxx and above. Prior to this prefix the values shown are sup plemental characteristics.

Agilent E4418B/E4419B Service Guide 1-5

Specifications

Power Meter Supplemental Characteristics

Measurement Speed

Over the GP-IB, three mea s urement sp ee d modes are a v ai l a bl e as shown , along wit h th e t yp ical maxi m um measurem ent speed fo r ea ch mo de:

• Normal: 20 readings/sec ond

• x2: 40 readi ngs/second

• Fast: 20 0 rea d i ngs/secon d, for Agilen t E-s eries powe r se nsors onl y

Maximum measurement speed is obtained using binary output in free run trigger m o de.

Zero Drift of Sensors

Power sensor dependent (refer to Table 1-3).

1-6 Agilent E4418B/E4419B Service Guide

Specifications

Power Meter Supplemental Character istics

Measurement Noise

Power sensor dependent (refer to Table 1-2 and Table 1-3). Averaging effects on measurement nois e. Averaging over 1 to 1024

readings is available for redu cin g noise. Table 1-3 provides the measurement noise for a particular power sensor with the number of averages set to 16 for normal mode and 32 for x2 mode. Use the “Noise Multiplier” for the appropriate mode (normal or x2) and number of averages to determi ne the tot al measurement noise value.

For example, for an Agilent 8481D power sensor in normal mode with the number of averages set to 4, the measurement noise is equal to:

(<45 pW x 2.75) = <124 pW

Table 1-2: Noise Multiplier

Number of Averages

Noise Multiplier (Normal Mode)

Noise Multiplier (x2 mode)

12481632641282565121024

5.5 3.89 2.75 1.94 1.0 0.85 0.61 0.49 0.34 0.24 0.17

6.5 4.6 3.25 2.3 1.63 1.0 0.72 0.57 0.41 0.29 0.2

Agilent E4418B/E4419B Service Guide 1-7

Specifications

Power Meter Supplemental Characteristics

Table 1-3: Power Sensor Specifications±

Power Sensor Zero Drift

Meas uremen t Noise

Agilent 8481A <±10 nW <110 nW Agilent 8481B <±10 µW <110 µW Agilent 8481D <±4pW <45 pW Agilent 8481H <±1 µW <10µW Agilent 8482A <±10 nW <110 nW Agilent 8482B <±10 µW <110 µW Agilent 8482H <±1 µW <10µW Agilent 8483A <±10 nW <110 nW Agilent 8485A <±10 nW <110 nW

Agilent 8485D <±4pW <45 pW Agilent R8486A <±10 nW <110 nW Agilent R8486D <±6pW <65 pW Agilent Q8486A <±10 nW <110 nW Agilent Q8486D <±6pW <65 pW

Agilent W8486A <±40 nW <450 nW

Agilent 8487A <±10 nW <110 nW

Agilent 8487D <±4pW <45 pW Agilent E4412A <± 15 pW <70 pW Agilent E4413A <± 15 pW <70 pW

1. Within 1 hour after zero set, at a constant te mperature, after a 24 hour warm-up of the power meter.

2. The number of av erages at 16 (for normal m ode) and 32 (for x2 mode), at a constant temperature, measu red over a 1 minute interval and 2 standard deviations. For Agilent E-series power sensors the measurement noise is measured within t h e low range. Refer to t he relevant power sensor manual for furthe r in formation.

1-8 Agilent E4418B/E4419B Service Guide

Power Meter Supplemental Character istics

Settling Time

0 to 99% settled readings over the GP-IB.

For Agilent 8480 series power sensors

Manual filter, 10 dB decreasing power step:

Table 1-4: Settling Time

Specifications

Number of Averages

Settling Time (s) (Normal Mode)

Response Time (s) (x2 mode)

Normal Mode x2 Mode

Maximum dBm

150 ms

Typical

Settling

Settling Times

Times

200 ms

500 ms

12481632641282565121024

0.15 0.2 0.3 0.5 1.1 1.9 3.4 6.6 13 27 57

0.15 0.18 0.22 0.35 0.55 1.1 1.9 3.5 6.9 14.5 33

Auto filter, def a ul t res o lu t ion, 10 dB decreasing powe r st ep, normal and x2 speed modes:

Maximum dBm

20 dB

10 dB

Power

Power Sensor

Sensor

Sensor Dynamic

Dynamic

Dynamic Range

Range

Typical

Settling

Settling Times

Times

150 ms

180 m s

350 m s

20 dB

10 dB

Power

Power Sensor

Sensor

Sensor Dynamic

Dynamic

Dynamic Range

Range

6.6 s Minimum dBm

Minimum dBm

10 dB

3.5 s Minimum dBm

10 dB

Agilent E4418B/E4419B Service Guide 1-9

Specifications

Power Meter Supplemental Characteristics

For Agilent E-series power sensors

Number of Averages

Settling Time (s) (Normal Mode)

Response Time (s) (x2 mode)

In FA ST m o de, within the range -50 dBm to +17 dBm, for a 10 dB decreasing power step, the settling time is 10 ms and 20 ms

When a decreasing power step crosses the power sensor’s auto-range

for the Agilent E4419B

for the Agilent E4418B

switch po in t , a dd 25 ms. Refer to th e re l ev a nt power sensor manual for further information.

F o r Agilent E-series p ower sensors i n normal and x2 speed mode s, manua l filter, 10 dB decreasing p o wer step:

Table 1-5: Settling Time

12481632641282565121024

0.07 0.12 0.21 0.4 1 1.8 3.3 6.5 13 27 57

0.04 0.07 0.12 0.21 0.4 1 1.8 3.4 6.8 14.2 32

1-10 Agilent E4418B/E4419B Service Guide

Power Meter Supplemental Character istics

Auto filter, def a ul t res o lu t ion, 10 dB decreasing powe r st ep, normal and x2 speed modes:

Normal Mode x2 Mode

Specifications

Typical

Settling Times

Maximum dBm

70 ms

120 ms

400 m s

6.5 s

Minimum dBm

60 dB

10 dB

Power Sensor Dynamic Range

Typical

Settling Times

Maximum dBm

40 ms

70 ms

210 ms

3.4 s

60 dB

10 dB

Minimum dBm

Power Sensor Dynami Range

Agilent E4418B/E4419B Service Guide 1-11

Specifications

Power Meter Supplemental Characteristics

Power Sensor Specifications

Definitions

Zero Set

In any power meas ur ement, the power meter must initially be set to zero with no power applied to the power senso r. Zero setting is accomplished within the power meter by digitally correcting for residual offsets.

Zero Drift

This parame ter is also called lo ng term stability and is the chan ge in the power meter indication over a long time (usually one hour) for a constant input power at a constant temperature , after a defined war m-u p interv al.

Measurement Noise

This paramete r is also kn o wn as sh or t term stability and is specified as the change in the po wer m ete r in di cation over a short time interval (usually one minute) for a co nstant inp ut power at a co nstant temperature.

1-12 Agilent E4418B/E4419B Service Guide

Specifications

Battery Option 001 Operational Characteristics

The following information describes characteristic performance based at a temperature of 25 product performance that is useful in the applicati on of the product, but is not covered by the product warranty.

Typical Operating Time

Up to 2 hours with LED backlight on; up to 3 hou rs with LED backligh t off.

Charge Time

< 2 hours to charge fully from an empty state: 50 minutes charging enables 1 hour of operation with L ED backlight ON; 35 minutes charging enables 1 hour of operation with th e LED backlight OFF. Power meter is operational whilst charging.

Service Life

°C unless otherwise note d. Ch aracte ri stics describe

To 70% of initial capacity at 25 cycles.

Chemistry

Nickel Metal Hydride.

Weight

1 kg.

°C: approximately 450 charge/discharge

Agilent E4418B/E4419B Service Guide 1-13

Specifications

General Characteristics

Rear Panel Connectors

Recorder Output(s)

Analog 0-1 Volt, 1 kΩ output impedance, BNC connector

GP-IB

Allows communication with an external GP-IB controller.

RS-232/422

Allows communication with an external RS-232 or RS422 controller. Male Plug 9 position D-subminiature connector.

Remote Input/Output

A TTL log ic le ve l i s out put whe n the m ea sure men t e xce eds a p red et er mine d limit. TTL inputs are provided to initiate zero and calibration cycles. RJ-45 se ri es shielde d m o dular jack ass em b l y.

TTL output: high = 4.8 V max; low = 0.2 V max TTL input: high = 3.5 V min, 5 V max; low = 1 V max, -0.3 V min

Ground

Binding post, accepts 4 mm plug or bare-wire connection

Line Power

• Input Voltage Range: 85 to 264 Vac, automatic selection

• Input Frequency Ra nge: 50 to 440 Hz

• Power Requirement: approximately 50 VA (14 Watts)

1-14 Agilent E4418B/E4419B Service Guide

Specifications

Environmental Characteristics

General Conditions

Comp lies with th e requirem ents of th e E M C D i rective 8 9 /3 3 6/EEC. This includes Generic Immunity Standard EN 50082-1: 1992 and Radiated Interference Standard EN 55011:1991/CISPR11:1990, Group 1 - Class A.

Operating Environment

Temperature

0ºC to 55ºC

Maximum Humidity

95% at 40ºC (non-condensing)

Minimum Humidity

15% at 40ºC (non-condensing)

Maximum Altitude

3,000 meters (9,840 feet)

Storage Conditions

Storage Temperature

-20ºC to +70ºC

Non-Operating Maximum Humidity

90% at 65ºC (non-condensing)

Non-Operating Maximum Altitude

15,240 meters (50,000 feet)

Agilent E4418B/E4419B Service Guide 1-15

Specifications

General

Dimensions

The following dimensions exclude front and rear panel protrusions:

212.6 mm W x 88.5 mm H x 348.3 mm D (8.5 in x 3.5 in x 13.7 in)

Weight

Net

Agilent E4418B, 4.0 kg (8.8 lb) - 5.0 kg (11.0 lb) with option 001 Agilent E4419B, 4.1 kg (9.0 lb) - 5.1 kg (11.2 lb) with option 001

Shipping

Agilent E4418B, 7.9 kg (17.4 lb) - 8.9 kg (19.6 lb) with option 001 Agilent E4419B, 8.0 kg (17.6 ib) - 9.0 kg (19.8 lb) with option 001

Safety

Conforms to the following Product Specifications:

• EN61010-1: 1993/IEC 1010-1:1990+A1/CSA C22.2 No. 1010-1:1993

• EN60825-1: 1994/IEC 825-1: 1993 Class 1

• Low Voltage Directive 72/23/EEC

1-16 Agilent E4418B/E4419B Service Guide

Specifications

General

Remote Programming

Interface

GP-IB interface operates to IEEE 488.2. RS-232 and RS-422 interfaces are supplied as stand ar d.

Comman d Language

SCPI stan d ar d in terface comman ds. Agilent E4418B is HP 437B code compatibl e. HP E4419B is HP 438A code compatible

Agilent E4418B/E4419B GP-IB Compatibility

SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP1, DC1, DT1, C0

Non-Volatile Memory

Battery

Lithium Polycarbon Monoflouride, approximate lifetime 5 years at 25ºC.

Agilent E4418B/E4419B Service Guide 1-17

Specifications

General

1-18 Agilent E4418B/E4419B Service Guide

Performance Tests

Per formance Tests

Introduction

The procedures in this chapt er test the power met er’s electrical performance using the specifications in Chapter 1 as the performance standards. All tests can be performed without access to the interior of the power meter. A simpler operational test is inc lude d in “ Se lf Test” of the User’s Guide.

Note For valid performance tests, the follo win g cond itions must be met:

a. The power meter and test e quipm ent must have a 30 minute warm-up for all specific ations.

b. The line voltage for the power meter must be 85 to 264 Vac and the line frequency must be 50 to 440 Hz.

c. The ambient temperature must be 00 to 550C.

2-2 Agilent E4418B/E4419B Service Guide

Performance Tests

Introduction

Equipment Required

Table 2-1 lists all the equipment required for the adjustments and performance tests. If substitutions must be made, the equipment used must meet the critic al sp e cific atio ns.

Table 2-1: Required Equipment

Equipment

Required

Model Number Critical Specification Usage

Digital Multimeter Agilent 3458A Range 0 to 20 V

Resolution 0.01 V

DC Calibrator Datron 4000A

Fluke 5720A

Range Calibrator

Agilent 11683A or Agilent 11683A Opt H01

Option H01 is essential for accurate verification. (See analysis in Standard 11683A can be used for indicati on on l y.

Appendix A). The

Frequency Counter Agilent 53132A Range 10 Hz to 50 MHz

Resolution 1 Hz

Power Meter Agilent 432A Range 1 mW

Transfer Accuracy 0.2%

Thermistor Mount Agilent 478A Opt H75/H76

Agilent 8478B Opt H01

SWR<1.05 at 50 MHz Accuracy ±0.2% at 50 M Hz.

Power Sensor Agilent E-series power

sensor

P and A

30 dB Attenuator Agilent 11708A

Agilent 8491A Option 030

Power Sensor Cable

1. P = Performance Tests, A = Adjustments

Agilent 11730A or Agilent

E9288A

Agilent E4418B/E4419B Service Guide 2-3

P and A

Per formance Tests

Introduction

Performance Test Record

Results of the performance tests may be tabulated in Table 2-7, “Performance Test Record,” on page 2-23. The Performance Test Record lists all of the performance test specifications and the acceptable limits for each specification. If performance test results are recorded during an incoming inspection of the power meter, they can be used for comparison during periodic maintenance. The test results may also prove useful in verifying proper adjustments after repairs are made.

Performance Tests

The performance tests given in this chapter are suitable for incoming inspection or preventive maintenance. During any performance test, all shields and connecti ng hardware must be in place.

The tests are designed to verify published power meter specifications. Perform t he tes ts in the order give n and record the dat a in Ta ble 2-7 on page 2-23 and/or in the data spaces provided at the end of each procedure.

Calibration Cycle

This power meter requires periodic verification of performance to ensure that it is operating within specified tolerances. The performance tests described in t his ch apter s hould be perf ormed once every t wo yea rs. Under conditions of heavy usa ge or seve re oper ating environments, the tests should be more frequent. Adjustments that may be required are described in Chapter 3.

Test Procedures

It is assumed that the per so n p erfo rm in g the following tests un d e rst and s how to operate the specified test eq uipmen t . Equi pment se tti ngs, other than those for the power meter, are stated in general terms. It is assumed that the person will select the proper cables, adapters, and probes required for test setups illustrated in this chapter.

2-4 Agilent E4418B/E4419B Service Guide

Zero Tes t

Specification

Electric al Charac te ristics Perform ance Lim its

Performance Tests

Zero Test

Accuracy: Zero set (Digital settability of zero) ±0.0764 µW

1. This performance limit is determined by the zero set specification of the powe r sensor used in the measur ement plus the measurement noise. The rang e calibrator ha s a zero s et specification of noise specification is 110 nW at 16 averages. At 512 av erages a noise multiplier of

0.24 is required, gi vi ng a measurement noise specification of 0.0264 µW (0.24x512).

±0.05 µW . The calibrator measurement

Description

After the power meter is initially calibrated and zeroed, the change in the digital readout is m onitored. This test als o takes d rift and noise into accoun t , si nce d rif t , no is e a nd z e ro re a d ings canno t be s eparated.

Equipment

Range Calibrator .................................. Agilent 11683A

Power Sensor Cable .............................Agilent 11730A

Test Setup

Power M e t e r

Range Calibrator

CHANNEL A

Agilent 11730A

POWER

METER

Figure 2-1: Zero Test Setup

Agilent E4418B/E4419B Service Guide 2-5

Per formance Tests

Preset

dBm/W

System

Zero

Zero Test

Procedure

The following procedure should be performed for the Zero Test.

Note The procedure deta i l s the key pres se s required on the

Agilent E4418B. For the Agilent E4419B the equivalent key presses should be performed on both chan nels.

1. Connect the equipment as shown in Figure 2-1.

2. Swi t ch the power m e t e r o n.

3. Press then .

Local

4. Press , for a reading in watts.

5. Set th e range calibrator as follows:

RANGE............................................3 µW

POLARITY......................................NORMAL

FUNCTION.....................................STANDBY

LINE................................................ON

Confirm

Note When switching the rang e ca libra to r to S TANDB Y, allow enough

time for the range calibrator to settle to its zero value before attempting to zero the power meter . This settling would appear on the power meter display as downward drift. When the drift has reached minimum , (typ ica lly le ss th an 60 se cond s), the range calibrator is settled.

6. On the power meter press ,

Filter Filter On Mode Man Length

, , , , and set the filter

Inputs

length to 512 in the pop up window then press .

7. On the power meter press , . Wait approximately 10

Cal

Input Settings

Enter

Zero

, ,

seconds for the wait symbol to disappear.

8. Wait 30 seconds then verify that the power mete r’s reading is within ±0.05 µW. Record the re a d i ng.

Table 2-2: Zero Test Results

Channel B

Min

Channel A

Actual Re s ul t

Actual Result

(Agilent E4419B

Max

Only)

-76.40 nW ________________ ________________ +76.40 nW

2-6 Agilent E4418B/E4419B Service Guide

Instrument Accuracy Test

Specification

Electric al Characteristics Performance L imits

Performance Tests

Accuracy ±0.5% or ±0.02 dB

1. This performance limit does not include the corresponding sensor power linearity speci fication.

Description

The power meter accuracy is verified for variou s power inpu t s. There are two different methods described here that can be used to perform this test, although one of these methods has a relatively high measurement uncertainty values associated with it.

Test Procedure 1

Note The measurement uncertainty of this test procedure is relatively

high at power levels of 30uW and below, as it uses a stan dard 11683A Range Calibrator. As such, this test procedure should be used for indication only.

Equipment

Range Calibrator...................................Agilent 11683A

Power S ens or Cable...............................Agilent 11730A

Agilent E4418B/E4419B Service Guide 2-7

Per formance Tests

Preset

dBm/W

Instrument Accuracy Test

Test Setup

Pow er Meter

Range Calibrator

CHANNEL A

Agilent 11730A

Figure 2-2: Instrument Accu ra cy Test Setup

Procedure

The following procedu re should be perf ormed for the Instr ument Accurac y Test.

Note The procedure deta i l s the key pres se s required on the

Agilent E4418B. For the Agilent E4419B the equivalent key presses should be performed on both chan nels.

1. Connect the equipment as shown in Figur e 2-2.

2. Swi t ch the power m e t e r o n.

3. Press then .

Local

4. Press , for a reading in watts.

5. Set th e range calibrator as follows:

RANGE........................ .................... 3 µW

POLARITY...................................... NORMAL

FUNCTION.....................................STANDBY

LINE ............................................... ON

Confirm

POWER

METER

2-8 Agilent E4418B/E4419B Service Guide

Performance Tests

System

Zero

Instrument Accuracy Test

Note When switching the rang e ca libr ato r to S TANDB Y, allow enough

6. On the power meter press ,

Filter Filter On Mode Man Length

, , , , and set the filter

Inputs

length to 512 in the pop up win d ow then p ress .

7. On the power meter press , . Wait approximately 10

Cal

Input Settings

Enter

Zero

, ,

seconds for the wait symbol to disappear. V erify that the display reads 0 ±0.05 µW.

8. Set the range calibrator’s FUNCTION switch to CALIBRATE.

9. Set th e ra nge calibrator ’s RANGE sw it ch to 1 mW.

10. Press to calibrate the power meter.

Cal

11. Set the range calibrator’s RANGE switch to the positions shown in Table 2-3 on page 2-10. For each setting, verify that the power meter’s reading is within the limits shown.

Agilent E4418B/E4419B Service Guide 2-9

Per formance Tests

Instrument Accuracy Test

Table 2-3: Instru m e nt Accuracy Results (For Indication Only)

Range

Calibrator

Setting

Min

Channel A

Actual Results

Channel B

Actual Results

(Agilent E4419

B only)

Max

3 µW3.100 µW _______________ _______________ 3.230 µW 10 µW9.900 µW _______________ _______________ 10.10 µW 30 µW 31.40 µW _______________ _______________ 31.80 µW

100 µW 99.50 µW _______________ _______________ 100.5 µW 300 µW 314. 00 µW _______________ _______________ 318.00 µW

1 mW 0.995 mW _______________ _______________ 1.005 mW 3 mW 3.141 mW _______________ _______________ 3.171 mW

10 mW 9.984 mW _______________ _ ______________ 10.08 mW 30 mW 31.63 mW _______________ _______________ 3 1.94 mW

100 mW 100.9 mW _______________ _______________ 101.8 mW

1. These performance limits are determined by the zero set specification of the power sensor used in the measurement plus the measurement noise.

Note The nominal outputs for the 3µW, 30 µW, 300 µW, 3 mW, 10 mW,

30 m W and, 100 mW settings are 3.16 µW, 31.6 µW, 316 µW,

3.156 mW, 10.03 mW, 31.78 mW, and 101.3 mW respectively.

Note It is not neces sary to ch ec k instrument accur acy in dBm . T he

power meter uses the same internal circuitry to measure power and mathematically converts watts to dBm .

2-10 Agilent E4418B/E4419B Service Guide

Performance Tests

Instrument Accuracy Test

Test Procedure 2

Note This test procedure makes use of a 11683A Range Calibrator fitted

with option H01. The measurement uncer t a i nty of this test procedure is significantly lower than the previously described method (refer to Appendix A f or a des cr i pt i on of the mea s ur ement uncertainty analysis). As such, this test procedure should be used to ensure the power meter meets it's published specification.

Equipment

• Range Calibrator: Agilent 11683A Option H01

• Power Sensor Cable: Agilent 11730A

• DC Range Calibrator: Datron 4000A

Test Setup

DC Calibrator

Power Meter

CHANNEL A

Power sensor cable

Range Calibrator

Figure 2-3: Instrum ent Ac curacy (Average Path) Test Setup

Agilent E4418B/E4419B Service Guide 2-11

Per formance Tests

Preset

dBm/W

Meas

Instrument Accuracy Test

Procedure

The following procedu re should be perf ormed for the Instr ument Accurac y Test.

Note The procedure deta i l s the key pres se s required on the

Agilent E4418B. For the Agilent E4419B the equivalent key presses should be performed on both chan nels.

1. Connect the equipment as shown in Figur e 2-3.

2. Unplug the range calibrator's power cord. Due to a ground loop design problem with th e 1168 3A option H01 ra nge cali brat or, it will not operate properly unl ess gr ound lo ops are elimi nat ed. The instrument will continue to operat e with no pow er appl ie d, and disconnecting the power cord eliminates the problem.

WARNI NG There is a small risk of mild electrical shock from the

chassis of the 11683A option H01 range calibrator unless the power meter is connected.

3. Figure 2-3 shows the HI/LO outputs of the DC calibrator connected to the DC reference input of the range calibrator. Ensure that the Guard and LO output of the DC calibrator are floating, and are not connected to the earth ground.

4. Swi t ch the power m e t e r o n.

5. Press then .

Local

6. Press , for a reading in watts.

7. Press on the power meter, and set the value

Setup

Confirm

Resolutio

to 4.

8. Set th e range calibrator as follows:

• RANGE: 100 mW

• POLARITY: NORMAL

•FUNCTION: STANDBY

• REF SWITCH: EXT

•LINE: OFF

2-12 Agilent E4418B/E4419B Service Guide

Performance Tests

System

Zero

Instrument Accuracy Test

Note When switching the rang e ca libr ato r to S TANDB Y, allow enough

9. Set the DC calibrator as follow s:

• SET VALUE: 0 (ZERO)

• FUNCTION: DC

• OUTPUT: OFF

10. On the power meter press ,

Filter Filter On Mode Man Length

, , , , and set the filter

Inputs

length to 512 in the pop up win d ow then p ress .

11. On the power meter press , . Wait approximately 10

Cal

Input Settings

Enter

Zero

, ,

seconds for the wait symbol to disappear. V erify that the display reads 0 ±0.05 µW.

12. Set the DC cali brator output to 144.93mV, and set the output switch to '+'.

13. Press to calibrate the power meter.

Cal

Agilent E4418B/E4419B Service Guide 2-13

Per formance Tests

Instrument Accuracy Test

14. Set the DC calibrator output to the values shown in Table 2-4. For each setting, set the filte r length of the power mete r to the corresponding value, and veri f y that the power me ter reading is within the limits sho wn. Refer to step 10 for details o n how to setup the filter len gth .

Table 2-4: Instrument Accuracy Results

Calibrator

Setting

458.31uV 3.1623 uW 256 0.028 uW 3.0977uW 3.2269uW

1.4493mV 10uW 256 0.027 uW 9.904 uW 10.096uW

4.5831mV 31.6228uW 256 0.027 uW 31.428uW 31.819uW

14.493mV 100uW 64 0.073 uW 99.49uW 100.51uW

45.831mV 316.2278uW 64 0.104 uW 314.72uW 317.74uW

144.93mV 1mW 16 0.2 uW 0.9954mW 1.0047mW

459.12mV 3.1623mW 16 0.9 uW 3.1477mW 3.1769mW

1.4588V 10mW 16 1.6 uW 9.954mW 10.046mW

4.6872V 31.6228mW 16 4.8 uW 31.477mW 31.769mW

15.588V 100mW 16 18.5 uW 99.54mW 100.46mW

Effective

Power

Applied

Power

Meter

Filter

Setting

Meas

Unc

Lower

Limit

Ch A

Result

Ch B

Result

Upper

Limit

Note The test limits shown in th is table d o not tak e into acc o unt the

correspo nding measure m e nt uncertaint y va lu e s.

2-14 Agilent E4418B/E4419B Service Guide

Po wer Reference Level Test

Performance Tests

Power Reference Level Test

Electrical

Characteristics

Power reference 1 mW Internal 50 MHz oscillator

Power refere nce accura cy setting

Power refere nce accura cy after 2 years

Performance

Limits

facto ry set to ±0 .4% tr acea ble to National Phy sica l Labora tory (NPL), UK.

±0.1% Guardban ded Test Line Limits.

±0.5%

(23 ±3

Worst case power me ter accuracy, taking into account the possibilit y of oscil lato r drift and operation at 55 degree s.

Conditions

Description

This test verifies the power level accuracy of the internal 50 MHz osci ll ator—also cal led the power reference oscillator. The power reference oscillator output is factory adjusted to 1 mW ±0.4%. This accuracy includes a performance limit of 0.1% and a system measurement uncertainty figure of 0.3% (traceable to the National Physical Laboratory (NPL), UK). Refer to Appendix B for the measurement uncertainty of the system.

Note The setting of the oscillator output accuracy is determined from the

system measurement uncertainty plus any chosen test line limit. For example, if a test line limit of 1 mW ±0.2% was chosen while

maintaining a system measur ement uncer t a int y of ±0.3%, the overall accuracy of the test setup for the 1 mW power out put be com es

0.3% + 0.2%, giving a setting accuracy of 0.5%.

Agilent E4418B/E4419B Service Guide 2-15

Per formance Tests

Power Reference Level Test

If an equivalent measurement system is employ ed f or post-factory test, the power reference oscillator output can again be set to 1 mW ±0.4%. This setting is sufficient to ensure that the power reference oscillator meets the accuracy specification of ±0.5% after 2 years. This specification includes the ±0.4% settin g and also tak es into acc o un t othe r facto r s that will contribute to determining the accuracy after 2 years. The complete breakdown of the ±0.5% specific atio n is as fo llo ws:

• Test line limit: 0.1%.

• System uncertainty: 0.3%.

• 2 year oscillator drift: 0.04% .

• Delta environment: <0.06%. The same equipment used to measure the accuracy of t he power reference

oscillator can also be used to set it to the post-factory accuracy of ±0.4% (for further information re f e r t o chap t e r 3, Adjust m e nts).

The following procedure ensures maximum accuracy in measuring power reference oscillator output using Agilent test instruments of known capability. Signal acqu isition criteria may vary if alternative test instr umen t s ar e us ed. In s u ch ca se s re f er to the man uf act ur er’s guide li ne s for furthe r i nf o r m a ti o n.

The test is performed using Equatio n 2-4:

Equation 2-4: Power Level Provided By The Reference Oscillator

–+

meas

compV1V0

---------------------------------------------------------------------------------- -= 4R Calibratio

–()V

nFactor()

The components of this equation are defined as foll ows:

is the voltage measured between V

•V

comp

and V

with no powe r

applied and after the Agilent 432A has been zeroed.

•V

is the voltage measured between V

comp

and V

with power applied.

This power is approx im ately 1 m W.

•V

is the voltage between th e Agilent 432A V

comp

connector and

comp

chassis ground with power applied.

• R is the resistance of the mount resistor in the Agilent 432A power meter. For fu rther information re f e r to A p pe ndix A.

• Calibration Factor is the value of the thermistor mount at 50 MHz

2-16 Agilent E4418B/E4419B Service Guide

Power Reference Level Test

Equipment

• Test power mete r: Agilent 432A .

• Thermistor moun t: Agil ent 478A opt ion H75 or H76.

• Digital voltmeter (DVM): Agilent 3458A.

Test Setup

Performance Tests

Pow er Meter

Te st Powe r Mete r

Power ref

Digital Voltmeter

Vcomp

Thermistor mount

Figure 2-4: Power Reference Level Test Setup

Procedure

Use the following procedure to perfo rm the power reference level test:

Note The procedure detail s the key presses required on the

Agilent E4418B. For the Agilent E4419B the equivale nt key presse s should be performed on both channels.

1. Set the DVM to me asu re resistance: Connect the DVM betw e en the V Agilent 432A and pin 1 on the thermistor mou nt end of the sen sor cab le . V erify that no power is applied to the Agilent 432A.

2. Round off the DVM reading to two decimal places and note this valu e

as the internal bridge resistance (R) of the Agilent 432A (approximately 200 Ω).

•R ____________Ω

3. Connect the equipment as shown in Figure 2-4, ensuring that the DVM

input leads are isolated from chassis ground.

connector on th e rear pa ne l of the

+ input

-input

Note Ensure that the Agile nt 432A and the power meter under test ha ve

been powered on for at least 30 minutes be fo re mov ing to step 4.

Agilent E4418B/E4419B Service Guide 2-17

Per formance Tests

Preset

Power Reference Level Test

4. Preset the power meter: Press , then on the power m e ter.

Local

Confirm

Set the Agilent4 32A RANGE switch to Coarse Zero. Adjust the front panel Coarse Zero control to obtain a zero meter indication.

5. Zero the Agilent 432A test power me te r:

•Fine zero the Agilen t 432A on the most sensit ive ran ge.

•Set the RANGE switch to 1 mW.

6. Set the DVM to measure m icr ovo lts.

7. Connect the p ositive and negative input leads to the V

comp

and VRF

connectors respectively, on the rear panel of the test power meter.

8. Observe the reading on the DVM. If less than 400 µV, proceed to the next step. If 400 µV or greater, press and hold the test power meter Fine Zero switch and adjust the Coarse Zero control so that the DVM indicates 200 µV or less. Release the Fine Zero switch and proceed to the next step.

9. Round the DVM reading to two decimal places. Record t h i s re a d i n g a s V

___________

•V

10.Turn the po wer refe re nce on: Press , .

Zero Cal

Power Ref O

11.Round the DVM reading to two decimal places. Record t h i s re a d i n g a s V

___________

•V

12.Disconnect the DVM negative input lead from the V

connector on the

Agilent 432A. Reconnect it to the Agilent 432A chassis ground.

13.Obs erve the DVM read ing. Record the readin g as V

•V

__________

comp

14.C alc ulat e th e Power Referen ce Osc illato r power usin g eq uatio n 2-4.

15.Verify that P

is within the limits shown in Table 2-5 and record the

meas

reading in the table.

Table 2-5: Power Reference Level Test Result

Min Max Actual Result

0.999 mW 1.001 mW ________________

2-18 Agilent E4418B/E4419B Service Guide

Performance Tests

Agilent E-Series Power Sensor Interface Test

The Agilent E-series power sensors have their sensor calib ration tables stored in EEPROM which enables the frequency and calibrati on factor data to be downloa ded automatically by the p o wer m e ter. The frequency and calibration factor data have checksums which are compared with the data downloaded by the powe r mete r. For the Agilent E4419B dual channel p o w e r m e ter, this test shoul d b e perf o rmed on both chann els.

Procedure

1. When there is no power sensor connected to the Channel A input the message “No Sensor” (“No Sensor ChA” on the Agilent E4419B) appears on the measurem ent window.

2. Connect the A gilent E-series power sensor to the power meter’s Channel A input. The message “Reading Sensor ChA” appears. When all the data is downloaded this message disappears and a reading is displayed on the measurement window. If the download fails, a war ning message and error flag are displayed on the front panel. Also, SCPI error message “-310, System Error” is generated.

3. For the Agilent E4419B repeat these steps for Channel B.

Agilent E4418B/E4419B Service Guide 2-19

Per formance Tests

Agilent E-Series Power Sensor Functional Test

Description

This test verifie s that the mete r /sen so r com bin atio n can make RF measurements.

The Agilent E-series power sensors operate over a 90 dB dynamic range (-70 to +20 dBm). However, since there is an amplifier in these power sensors, the voltages presented to the power sensor connector are always within the range of voltages available from the Agilent 11683A range calibrator.

Equipment

Power Sensor Cable...............................Agilent 11730A

Reference Attenuator............................Agilent 11708A

Agilen t E-series powe r s e nsor

Procedure

T o complet e th e Functi onal Test the following procedu re should be performed.

Note The procedure deta i l s the key pres se s required on the

Agilent E4418B. For the Agilent E4419B the equivalent key presses should be performed on both chan nels.

1. Connect the equipment as shown in Figur e 2-5. Powe r Meter

Figure 2-5: Sensor Functional Test Setup

2-20 Agilent E4418B/E4419B Service Guide

Agilent E-Series Power Sensor

POWER REF

CHANNEL A

Agilent 11730A

Performance Tests

Preset

Zero

System

Agilent E-Series Power Sensor Functional Test

2. Press then .

Local

3. On the power meter press , . Wait approxima t el y

Confirm

Cal

Zero

10 seconds for the wait symbol to disappear. Verify that the display reads 0 ±50 pW.

4. Press to calibr ate the p ow er m ete r.

Cal

5. Turn the pow e r referenc e on by pressi ng

■ , on the Agilent E4418B.

■ , , , on the

Power Ref Off On

Cal

Power Ref Off On

Agilent E4419B.

6. Connect the 30 dB attenuator as shown in Figure 2-6. Power M e t e r

Agilent E-Series Pow er Sens or

Agilent 11708A 30 dB ATTENUATOR

CHANNEL A

HP 11730A

Figure 2-6: Sensor Function al Test Setup with Attenuator

7. Press , , and select to “LOWER”.

Inputs

Input Settings Range

This s witch es to th e power sensor’s l ow rang e.

8. Verify that the display reads -30 dBm ±1 dB. Rec o rd the read i ng.

9. Press and set to “UPPER”. This switches to the power

Range

sensor’s upper range.

10. Verify that the display reads -30 dBm ±1 dB. Record t he re a d i ng.

11. Press and set to “LOWER”.

Range

12. Disconn e ct th e 30 dB attenuato r and rec onnect as shown in

Figure 2-5.

13. Verify that an overload error is displayed on the status line at the

top of the power meter’s display.

14. Press and set to “UPPER”.

Range

15. Verify that the display reads 0 dBm ±1 dB. Record the reading.

Agilent E4418B/E4419B Service Guide 2-21

Per formance Tests

Agilent E-Series Power Sensor Functional Test

Table 2-6: Functional Test Result

Test

ChannelA

Overload Error

Low Range, 30 dB pad Upper Range, 30 dB pad Low Rang e, no pad High Range, no pad

Channel B

Overload Error

(Agilent E4419B

Only)

2-22 Agilent E4418B/E4419B Service Guide

Performance Test Record

Model Agilent E4418B/E4419B Power Meter Tested by ___________________________________________ Serial Number ________ _______________________________ Date _______________

Table 2-7: Performance Test Record

Performance Tests

Test

Zero Test −76.40 nW +76.40 nW Instrument Accuracy

3.1623 µW 10 µW

31.6228 µW 100 µW

316.227 µW 1 mW

3.1623 mW 10 mW

31.6228 mW 100 m W

Power Reference

meas

Interface Test Pass/Fail ___________ ___________ Pass/Fail Functional Test

Low Range, 30 dBm pad Low Range, 30 dBm pad Low Range, no pad Upper Range, no pad

Min

Result

3.0977 µW

9.904 µW

31.428 µW

99.49 µW

314.72 µW

0.9954 mW

3.1477 mW

9.954mW

31.477 mW

99.54mW

0.999 mW ___________ ___________ 1.001 mW

Pass/Fail Pass/Fail Pass/Fail Pass/Fail

Channel A

Actual Result

___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________

___________ ___________ ___________ ___________

Channel B

Actual Result

___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________

___________ ___________ ___________ ___________

Max

Result

3.2269 µW

10.096 µW

31.819 µW

100.51µW

317.74 µW

1.0047 mW

3.1769 mW

10.046 mW

31.769 mW

100.46 mW

Pass/Fail Pass/Fail Pass/Fail Pass/Fail

Agilent E4418B/E4419B Service Guide 2-23

Per formance Tests

Performance Test Record

Test

Output Standing Wave Ratio Test

1. This test is not channel relat ed.

2. For instruments with the 50MHz 1mW output (power ref) connector mounted on the front panel .

For instruments with the 50MHz 1mW output (power ref) connector mounted on the rear

3. panel. This applies to models E4416A and E4417A with option 003 fitted.

Min

Result

N/A

Channel A

Actual

Result

___________ ___________

Channel B

Actual Result

Result

1.06

1.08

Max

1, 2 1, 3

2-24 Agilent E4418B/E4419B Service Guide

Adjustments

Introduction

This chapter descr ibe s adjustments and che cks which ensure prope r performance of the power meter. Adjustments are not normally required on any fixed periodic basis , a nd normal l y are perf ormed only af ter a performance test has indicated that some parameters are out of specification . Performanc e tests should be complete d after any rep air s that may have altered the characte r istic s of th e po wer m e ter. The test results will make it pos sible to determine if adjustments are required. Allow 30 minutes for the power meter to warm up, and then remove the cover, for access to the test and adjustment points.

T o determine which performan ce tests and adjustments to perform after a repair, see “Post -Repa i r Adjustments”, on page 3-3.

Safety Considerations

This warni ng must b e fol l owe d for your protection and to avoid damage to the equipment being used.

WARNI NG Adjustments described in this chapter are performed with

power applied to the instrument and with protective cover s rem oved . Mai nt ena nce sh ou ld be perf orme d onl y by trained personnel who are aware of the hazards involved. When the maintenance procedure can be performed without power, the power should be removed.

3-2 Agilent E4418B/E4419B Service Guide

Adjustments

Introduction

Equipment Required

The adjustment procedu res incl ude a list of recommen ded test equ ipment. The test equipment is also identified on the test setup diagrams.

Post-Repair Adjustments

Table 3-1 lists the adjustments related to repairs or replacement of any of the assemblie s.

Table 3-1: Post Repair Adjustments, Tests, and Checks

Assembly Replaced

A1 Power Supply Self Test . A2 Processor Assembly Frequency and Level Adjustments,

A3 Front Panel Assembly Instrument Accuracy Test, Display

A4 Comms Assembly All automated T est s and Serial Interface

A5 Daughter Assembly Instrument Accuracy Test. A6 Mea sur e m e nt Assem b ly Zero Test, Instru m e nt A cc uracy Test. W1 or W2 Power Sensor

Cable BT1 Lithium Battery Battery Self Test. Power Reference Cable Kits Power Reference Level Test.

Related Adjustments, Performance

Tests or Self Tests

Power Reference Level Test, Display Brightness and C ontrast Adjustme nt.

Brightness and C ontrast Adjustme nt.

Self Test.

Instr ument Accuracy Test, Ze ro Test.

Agilent E4418B/E4419B Service Guide 3-3

Adjustments

Power Reference Oscillator Frequency Adjustment

Note Adjustment of the power reference oscillator frequency may also

affect the output lev el of the os cilla to r. Therefore, after the frequency is adjusted to 50.0 ±0.5 MHz, the out put level should be checked as describe d in “Power Refer e nc e Oscillator Level Adjustment”, on page 3-6. The power reference oscillator frequency is a nominal specification .

Description

Variable inductor A2L9 is adjusted to set the power reference oscillator output frequency to 50.0 ±0.5 MHz. This frequ en cy is a sup pleme n tal characteristic.

Powe r Meter

POWER REF

Frequency Counter

Figure 3-1: Adjustment Setup

Equipment

Frequency Counter. ............................... Agilent 53132A

Procedure

1. Ensure that the power m eter has bee n powe red on for at least 30 m inu te s befor e making any measurement s.

2. Connect the equipment as shown in Figure 3-1. Set up the counter to measure frequency.

3-4 Agilent E4418B/E4419B Service Guide

Power Reference Oscillat or Frequency Adjustment

Zero

3. Turn the pow e r referenc e on by pressi ng

■ , on the Agilent E4418B.

■ , , , on the

Power Ref Off On

Cal

Power Ref Off On

Agilent E4419B.

4. Observe the reading on the frequency counter. If it is

50.0 ±0.5 MHz, no adjustment of the power reference oscillator frequency is ne cessary. If it is not within these limits, adjust th e power reference oscillator frequency as desc ribed in step 5 and step 6.

5. Remove the power meter cov e r.

6. Adjust A2L9 to obtain a 50.0 ±0.5 MHz indication on the frequency counter. Refer to Figure 3-2 for the position of A2L9.

A2R90

BT1

Adjustments

A2 Assembly

A2J13

J12

A2L9

Front Panel

Figure 3-2: A2L9 Adjustment Location

Agilent E4418B/E4419B Service Guide 3-5

Adjustments

Power Reference Oscillator Level Adjustment

Description

This test adjusts the power level accuracy of the internal 50 MHz oscillator —also called t he power ref eren c e osc illa t or.

The power refere nc e osc illator ou tp ut is fact or y adju ste d to 1 mW ±0.4% . This accuracy includes a perfor ma nce limit of 0.1% and a sys te m measurement un cer taint y figure of 0.3% (traceable to the Nat ional Physical Laboratory (NPL), UK).

Note The setting of the oscillator output accuracy is determined from the

system measurement uncertainty plus any chosen test line limit. For example, if a test line limit of 1 mW ±0.2 % was chosen while maintaining a system measur ement uncer t a i nty of ±0.3 %, the overal l accuracy of the test setup for the 1 mW power output be com e s 0.3 % +

0.2%, giving a setting accuracy of 0.5%.

If an equivalent measurement system is employ ed f or post-factory test, the power re ference os cillat or ou tput can a gain be set to 1 mW ±0.4%. T his setting is sufficient to ensure that the power reference oscillator meets the accuracy specific ation o f ±0 .5% afte r 2 years. This specific atio n includes the ±0.4% setting and also takes into account other factors that will contribute to determining the accuracy after 2 years. The complete breakdown of the ±0.5% specific a t io n is as follows:

• Test line limit: 0.1%.

• System uncertainty: 0.3%.

• 2 year oscillator drift: 0.04% .

• Delta environment: <0.06%. The following adjustment procedure ensure the power reference oscillator

meets th e p ost-factory ac curacy setting of ±0.4%.

Note To ensure maximum accuracy in re-adjusting the power reference

oscillator output, this procedure provides s t ep-by-step instructions for using Agilent test instruments of known capability. Signal acquisition criteria may vary if alte rn ativ e test instruments are used . In su ch cases re f er to the manuf a cturer’s guidelines f o r f urther information.

3-6 Agilent E4418B/E4419B Service Guide

Adjustments

–

2V0V1V0–

–

V0V

4Volts~

V0400µV<

Power Reference Oscillator Level Adjustment

Note The power meter may be returned to the nearest Agilent Technologies

office to have the power reference oscillator checked and/or adjusted.

Agilent 432A

Power Me t e r

Power ref

Thermistor Mount

Powe r Meter

Vcomp

Digital Voltmeter

INPUT

INPU

Figure 3-3: Adjustment Setup

For this adjustment the following mathematical assumptions are made:

Equation 1:

–+

meas

compV1V0

---------------------------------------------------------------------------------- -= 4R CalibrationFactor()

–()V

can be manipulated to give the following:

Equation 2:

compV0

comp

– 4R()CalibrationFactor()–+=

10()

3–

by using the following assumptions:

– V1V0–()–2=

The error in doing this is:

So if , that is, then the erro r ca n

2V1V

–+()

()

compV1V0

be ignored. In practice and . The error is less

()

comp

–()– 2V

– 2V1V

+2V

com

–()==

0V1V0

than 0.01%.

Agilent E4418B/E4419B Service Guide 3-7

Adjustments

3–

Power Reference Oscillator Level Adjustment

By substitutin g equation 3 into equation 1 and m anipulating the result you get:

V1V0–()

2– V

compV1V0

–()=410

()R CalibrationFactor()+

This qu ad ra t ic can be sol ve d t o give equati on 2 . The definitions of the terms in equation 2 are:

is the voltage measured between V

•V

comp

and V

applied and after the Agilent 432A has been zeroed.

•V

is the voltage measured between V

comp

and V

This power is approx im ately 1 m W.

•V

is the voltage between th e Agilent 432A V

comp

chassis ground with power applied.

• R is the resistance of the mount resistor in the Agilent 432A power meter.

• Calibration Factor is the value of the thermistor mount at 50 MHz.

Equipment

• Test power mete r: Agilent 432A .

• Thermistor Mount: Agilent 478A Opt ion H75 or H 76.

• Digital Voltmeter (DVM): Agilent 3458A.

Procedure

Note The procedure detail s the key presses required on the

Agilent E4418B. For the Agilent E4419B the equivale nt key presse s should be performed on both channels.

with no powe r

with power applied.

connector and

1. Set up the DVM to measure resistance. Connect the DVM between the

connector on the rear panel of the Agilent 432A and pin 1 on the

thermistor mount end of the sensor cable. Verify that no power is applied to the Agilent 478A

2. Round off the DVM reading to two decimal places and record this value

as the internal brid ge re sis tanc e (R) o f the test powe r mete r (approximately 200 Ω).

•R (Internal Bridge Resistance)_______________Ω

3-8 Agilent E4418B/E4419B Service Guide

Adjustments

Zero

Power Reference Oscillator Level Adjustment

3. Connect the equipmen t as shown in Figure 3-3. The leads should be isolated from ground. Ensure that the power reference oscillator is off. Ensure that both the pow e r me te r un der tes t and the A gilent 43 2A have been powered on for at least 30 minutes before proceeding to the next step.

4. Set the Agilent 432A range switc h to coa rse ze ro and adjust the front panel coarse zero control to obtain a zero meter indication.

5. Fine zero the Agilent 432A on the most sensitive ran ge, then set the range sw itch to 1 mW.

Note Ensure that the DVM input leads are isolated from chassis ground

when performing the next step.

6. Set up the DVM to measu re mi cr ovo lts.

7. Connect the p ositive and negative input leads, respectively, to the V

and VRF connectors on the rear panel of the Agilent 432A.

comp

8. Observe the readi ng on th e D VM. If l es s th an 400 µV, proceed with the next step. If 400 µV or greater, press and hold the Agilent 432A fine zero switch and adju st the coar se zer o contr ol so tha t the DVM indicates 200 µV or less. Then release the fine zero switch and proceed to the next step.

9. Round off the DVM reading to the nearest microvolt and record this value as V

________________µV

•V

•Disconnect the DVM negative input lead from the V

connector on

the test p o we r meter and reconnect it to chassis ground .

10. Turn the power refe rence on by pressin g

■ , .

Power Ref O

Cal

11.Record t he readin g on the DVM to two decim a l places. Th is is V

•V

12.R eco nn e ct th e neg ative le ad to th e V the Agilent 432A. The DVM is now set up to measure V

_____________V

comp

connector on the rear panel of

which

represents th e p o we r reference oscillator ou tp ut level .

13.Calc ulat e the required valu e of V

using equa tio n 2.

comp

compV0

comp

– 4R()CalibrationFactor()–+=

10()

3–

Agilent E4418B/E4419B Service Guide 3-9

Adjustments

Power Reference Oscillator Level Adjustment

14.Re mo ve the power meter ’s cover and adjust A2R90 un til the DVM indicates th e calculated value of V

. Refer to Figure 3-4 for the position

of A2R90:

A2R90

BT1

A2 Assembly

A2J13

J12

A2L9

Front Panel

Figure 3-4: A2R90 Adjustment Location

Measurement Uncertainty

Refer to Appendix B “Measurement Uncertainty Analysis – Powe r Reference Level Test”

3-10 Agilent E4418B/E4419B Service Guide

Adjustments

Display Brightness and Contrast Adjustment

Introduction

The following procedure should be performed whenever a front panel assembly or processor assemb l y are rep lac ed.

The brightness is controlled automatically after executing the

Set Brightness Service

Note The contrast adjustment is subjective and varies according to

individual user requirements.

Procedure

softkey, located under the softkey menu.

1. Access the softkey menu and use the softkey to increase the contrast, or the softkey to decrease the contrast of the display.

2. When the de sir ed di splay co n tra st le ve l is obt aine d , press the

Set Contrast Service

menu.

Display

softkey, located under the softkey

Agilent E4418B/E4419B Service Guide 3-11

Adjustments

Display Brightness and Contrast Adjustment

3-12 Agilent E4418B/E4419B Service Guide

Theory of Operation

Introduction

This chapter describ es how each of the power mete r’s assemblies operate. A block diagram is inc luded at the en d of the chapt er giving y ou an overall view of the power meter’s operat io n.

4-2 Agilent E4418B/E4419B Service Guide

Theory of Operation

A1 Power Supply/Battery Charger

The A1 power supply/battery charger is a 20 W, 47 to 440 Hz switching power supply produci ng three dc voltages, (+5 V, +12 V, -12 V) used to power the subasse mb l ie s, and a constant current supply to re cha rge the optional +12 V rechargeable Battery M odule (Agilent Part Number E9287A) when operatin g from an ac powe r source. The power supp ly can be driven either by AC power voltages in the range 85 to 264 V or by the A8 Rechargeable Battery Module.

The signal line Power_on, from the A2 proces sor assembl y to the A1 pow er supply assem bly, indicates the status of the front pa ne l PO W E R switc h. This signal line enables and disables the dc voltage outputs of the power supply assembly to the A2 processor assembly when driven by the A8 battery assembly. The chargin g cu rrent for the re chargeable battery module is independent of the state of the Pow er_on line.

A logic low on the Power_on line indicates that the front panel POWER switch is in s tandby mo de and the thr ee dc vol tage out puts from t he power supply are disable d. A lo gic high on this line indicates that the POWER switch is in the On mode and the three dc voltages from the power suppl y are enabled. Power is distributed to the m eter subassemblies via the processor assembly (See “A2 Processor Assembly”, on page 4-4).

If fitted, the A8 rechargeable battery module controls the charging current while ac power is connected to the meter.The fan assembly is active under the following cond itions:

1. ac power connec te d an d the POWE R switch set to On. or

2. ac power connecte d, POW ER switc h set to Standby and optional +12 V rechargeable battery module fitted .

The ac line fuse is located in th e lin e in put m o dule on the power meter’s rear panel (Agilent Part Number 2110-0957). The fuse holder contains a spare fuse as standard on ship m ent.

Agilent E4418B/E4419B Service Guide 4-3

Theory of Operation

A2 Processor Assembly

The processor assembl y cont ai ns the microc ontroller and associated circuits, the po w e r-on/ standby contro l a nd switching, the 1 mW reference calibrato r, the recorder outputs, TTL inpu t /output, and the front panel drivers. It provides tha t platform on which the power meter can run, facilitating the system inputs and outputs.

Regulated DC voltages at +12 V, -12 V and +5 V are converted by the A1 power supply asse mb ly whe n AC pow e r is connected to the rear pane l o r the optional rechargeable battery is fitted. The DC voltages are connected and distributed to the rest of the system by circuits on the processor assembly. When the key on the front panel is pressed a bis table latch changes state. This, in turn, app lie s the corr e ct ga te voltage s to tur n on three MOSFET switches, which connects the power supply unit voltages to the distributed p ow er buses. The bistable latch is connecte d to a permanent power-supply which has the b acku p of battery power when AC mains is removed from the power meter. The +12 V supply is used to power the fan. This is filtered to decouple it from the rest of the system. When the optional recharge able battery is fitted and the meter is in standby and connect ed to the ac powe r su ppl y, the recharg eable batte ry will recharge and the fa n will be pow ere d on.

The reference osc illato r has a 50 MHz oscillato r circuit with automatic level control (ALC). The oscillator output is level detected and that level is compared to a temperatur e stable precis io n referenc e vol tage. This comparison produces an error signal that gives negative feedback control of the oscillator output power. The frequency and power level of the calibrator are factory set to provide a 50 MHz 1 mW transfer standard. The precision reference v ol tage and the ALC control sign a l are both measured in the calibrator self test. The calibr ato r is sw itch ed o n or off using a signal from the microcontroller. The front panel LED indicator is switched with a separ a te mic roc on tr ol l er signal. The recorder outputs are driven from a dual 12 bit DAC which is driven by the microcontroller. The dual DAC outputs are buffered, filte red and scal ed to give a 1 V full scale outp ut nominal .

The recorder is a 12 bit DAC driven by the microcontroller. The DAC output is b uffered, filtered and scaled t o g i ve a 1 V full sca l e ou t put with a nominal 1 kΩ output impedance.

Circui try for the k ey b o ard driver includes so m e damage pr otection, bu t i t is basically a direct connection from the keypad row and column matrix to the microcon trolle r ’s control lin es.

4-4 Agilent E4418B/E4419B Service Guide

Theory of Operation

A2 Processor Assembly

The LCD contr ol le r on the A 3 fron t p ane l asse m bly is configured as a memory mapped peripheral, and as such requires only to be fed with the appropriate address, data and control lines from the microcontroller circuits . Th e bias volta ge for the LCD is produced by a DC to DC converter that takes the +5 V (DIST) voltage and converts that to a nominal +21 V. The DC to DC converter is adjusted by a combinat io n of the contr ast control signa l fro m t he microcontroller and the tempe rat ur e s en se voltage that is generated on the A3 front panel assembly. The temperature sense voltage helps to compensate for the normal variation of LCD contras t with temperature. Current to the LCD’s LED backlight array is sourced from a constant current circuit that compe ns ate s f or vari atio n in L E D k nee voltage. A control input to this circuit from the front p ane l te m pe ratu re sense voltage allo ws f o r de-r a tin g of the maximum LED current at high operating temperatures. A control input from the microcontroller allows the optimum backlight brightness to be factory set. The temperature sense voltage, LED current and LCD bias voltage are all measured at self test.

An analog multiplexer provides means by which several diagno stic poin ts can be switched to the A 6 meas urement assembly ( s) for an alogue to digital conversion. The microcontroller uses this function to perform self test.

A6 measurement assembly(s) to microcontroller communication is conducted on a serial interface bus, the Internal Serial Bus (ISB). The ISB is connected to the bi-direc tion al ser ial port on the micr ocon t roller via buffers. The system clock and some control signals are connected to the measurement modules. The measurement module interface is completed with the distribution of switched and direct power (+12 V, -12 V and +5 V).

The TTL outputs are conn ected to the A6 processor assembly via in line resistors locate d on the A4 int e rfac e ass emb ly. A TTL lo gic level is outp u t from the processor assembly when the user defined windows based limits are exceeded.

The TTL inputs are connected to the processor card via in line resistors located on the interf ace car d and can be used to initiat e zero and calibration cycl es on the power meter.

Agilent E4418B/E4419B Service Guide 4-5

Theory of Operation

A2 Processor Assembly

The microcontroller circuits that control all the above functions, and provide platform for the system software to run on, comprise the microcontroller itself, memory, and clock and logic circuits. The logic circuits ha v e t he function of ensur i ng t h e correct sequencing and decoding of the control signals for the various peripherals. The crystal oscillator clock circuit is buffered and distributed to the A4 interface assembly and the A5 daughter asse mbly. The program memory for the microcontro ller is FLASH EEPR OM to allow for in-circuit prog ram ming. The static RAM is split into volatile and no n- volatile blocks, with the pow e r for the non-volatile RA M be ing conne c te d to the p erm an en t (batte r y backe d) power supply.

Note It is advisable to replace the RAM battery A2BT1 every three

years. If the battery fails or drops below 3 V the RAM will lose the following information when power is disconnected from the meter:

Unit Serial Number Revision letter of Processor Card Unit Option User defined setups User defined sensor calib rat i on tables

4-6 Agilent E4418B/E4419B Service Guide

Theory of Operation

System

A3 Front Panel Assembly

The front panel ass emb ly is m ad e up of a liquid crystal display (LCD), a keypad and, depending on the power meter option, a power reference cable assembly and a sensor cable assembly(s).

There are two inputs to the front panel assembly:

• the flex circuit from connector A2J4 of the pro cessor assembly which controls the keypad.

• the ribbon cable from A2J3 of the processor assem bly wh ich contro ls t he LCD dis p la y.

The power meter self tests cont ain display tests. These are accessed by

pressing , , , , ,

Display

Inputs

Service Self Test Individual

Agilent E4418B/E4419B Service Guide 4-7

Theory of Operation

A4 Comms Assembly

The comms assembly contains the circuitry required for remote control of the power meter. This assembly supports parallel and serial interfaces.

The GP-IB interface is supported by a protocol controller integrated circuit and two physical interface buffers. The system clock is divided by four to provide the GP-IB controller integrated circuit clock signal.

The RS232 and RS422 interface is supported by a single Universal Asynch ro no us Recei ve r/Transceiver ( UAR T) in tegrated circuit and a programmable transceiver. The programmable transceiver can be configured for either RS232 or RS422. The remote interface is d esign ate d a DTE (Data Terminal Equipment).

The programmable baud rate gene rat or in the UART is driven from the system clock (16.67 MHz) which allows baud ra tes in the ran ge 50 to

115.2 K. The whole assembly is connected to data, address, and control signals

from the A2 processor assembly. The comms assembly also provides a filtered path for the single/dual

recorder out put signal and the TTL input and output signals . It als o provides ESD protection for the RS232.422, TTL I/O, and Recorder outputs.

4-8 Agilent E4418B/E4419B Service Guide

Theory of Operation

A5 Daughter Assembly

The A5 daughter assembly is loaded vertically into the A2 processor assembly. The Agilent E4418B has five connectors on the A5 daughter assembly:

• two 6-way co nnect ors route the signal lines between the rechargeable battery assembly and the A1 power supply/charger assembly, and provide an inte rface for the signal lin e s that are monitored by the A2 proc es sor ass embly.

• a 48-way connector provides the interface for the A2 processor assembly signals.

• a 36-way slotted post connector provides the interface for the A6 measurement assembly.

• a 2-way connector for production test only.

The Agilent E4419B has an additional 36-way slotted post connector.

Agilent E4418B/E4419B Service Guide 4-9

Theory of Operation

A6 Measurement Assembly

There is one measu rement assemb ly i n the Agilent E4418B and two in the Agilent E4419B.

The measurement ass embly amplif ies and c onvert s the chop ped AC signal produced by the power sensor (either Agilent 8480 series power sensors or Agilent E-series powe r sens or s) into a 32 bit di gital wor d. T his digital word is proportional to the input RF power level applied to the power sensor. The measurement asse mbl y also mea sures the sensor resistor voltage to detect whether a power sensor is present. If a power sensor is connected it determines the model, a nd w heth er it’s connected t o the front or rear panel. This assembly produces the differential drive signal for the power sensor’ s ch opper. When an Agilent E-series powe r sensor is present this assembly converts and corrects the power sensor’s temperature dependent voltage.

With refe rence to t he block diagr am at th e end of this c hapter, the chopped AC input signal is amplified by the input amplifier . This operational amplifier in combination with a single bipolar transistor in the power sensor, produce a feedback amplifier which has a gain of approximately

500. The “Feedback” line shown sets the gain and also biases the transistor. The differential ampl ifie r rem o ves any common mode no ise o r interference. It uses a special ground wire (“Sensor Ground”), connected close to the RF bulkhead in the power sensor as it’s second input.

The band pass filter represent s the filte ri n g acti on of the input ampli f i er. When the power m ete r is working with an Agilen t E-serie s po we r sensor the equalizer is switched on to reduce the high pass cut off frequency of the input amplif ie r. This improves the settling time in f ast m od e operation.

The output of the equalizer is split into two paths. One path is amplified by a gain of 100. Both signals are each converted to dig ital wor d s by the dual analog to digital converter (ADC). The ADC’s sampling rate is set to a frequency 200 times above the chop rate for the Agilent 8480 series power sensors and 100 times above the ch op rat e for the Agilen t E-series powe r sensors.

The Digital Signal Proces sor (DSP) converts the chopped signals into digital words proportional to the input level. It compares both levels, calibrates the gain and d ecid es which level is output to the ho st p roc es so r (after additional filte rin g) via the “Intern al Serial Bus” .

4-10 Agilent E4418B/E4419B Service Guide

Theory of Operation

A6 Measurement Assembly

The DSP chip controls the logic which sets the chopper driver voltage and frequency control. For the:

• Agilent 8480 series power sensors this is 0 V and -10 V at 217 Hz.

• Agilent E-series power sensors this is +7 V and -3 V at 434 Hz.

The DSP also control s logic to allow t he A UX ADC to measure a number of voltages, and when requ este d , send the relevant data to the host processor. The AUX ADC digitizes a voltage which is produced by the Agilent E-series power sensors and is proportional to temperature. This voltage is required for temperat ur e compen sat i on . This AUX ADC also tests the sensor resistor wires to check sensor continuity. Lastly, use is made of this AUX ADC for the pow e r me te r’s self test of both the measurement assembly and the A2 processor assembly. The results are reported back to the A2 processor ass e mbly via th e “Inte rn al Serial Bu s”.

The Agilent E-series power sensors have built in serial EEPROM and range switching which is controlled or acce sse d via the m easurement assembly. The “N-Chop” sensor wire used by the Agilent 8480 series power sensors double s as a serial clock and the sensor resis to r line d ouble s as a bi-directional serial da ta line. The “Auto Zero” line is also used as a serial bus enable control.

The wire labelled “Auto Zero” is grounded to the “Sensor Ground” line when an Agilent 8480 series power senso r is used. Auto zeroing is accomplished without the need for this sign al i n the power meter.

All clocks are derived from t he 16.67 MHz system cl ock w hich i s g enerated on the A2 processor assembly and distributed on the A5 daughter assembly.

Agilent E4418B/E4419B Service Guide 4-11

Theory of Operation

A8 Rechargeable Battery As sem bly

A8 Rechargeable Battery Assembly

The A8 Rechargeable Battery Assembly all ows the EPM power meter with option 001 fitted to operate when no AC power in p ut is availab le. The battery pack contain s a he alth mon ito rin g cir cu it wh ich the A2 p roce s so r assembly can interr ogate. Th e A8 batte ry assembly connects to the A2 proces s o r a ssembly an d the PSU/battery cha rger circuit via the A 5 Daughter Assembly.

There are th ree c onnec tions fr om the rech argeab le bat tery as sembly to t he A1 psu/charger assembly, +12V, 0V , and Signal 1. The Signal 1 line is an indicator line which signals when the battery is below a threshold limit. When this line go es low, indicating there is insuffic ie nt cha rg e lef t in the Battery Assembly to continue operating the power meter, it will cause the A1 psu/charger assembly to shut down.

There is one connection, the communications line, from the A8 Battery Module to the A2 processor assembly. This line provides serial communic atio ns with the processor asse m bly o n batter y pa ck status information, such as amount of charge remaining. When there is less than 10 minutes run time char ge rem ainin g in th e bat tery an error me ssage "Battery Power Low’" is displayed on the power meter front panel display .

The battery assembly ca n only be recharged when fitted to a power meter with the battery option fitted. The charge current from the charging circuit is controlled by a mod u le con tain e d within the Battery assem bly. When the ac power is connected the battery assembly regulates the charging current based on the discharge state of the battery.

The battery should fully charge from empty within 2 hours. At 25 degrees C this will give the me te r 2 hour s ope ra tio nal tim e. The A8 Battery module has a lifetime of approximately 450 charge/discharge cycles after which the battery can still be use d, but will o nly have appr oxim ate ly 70 % of its original capacity. The battery capacity may be reduc e d wh ilst charging at temperatures abov e 35 degrees C.

Note:- partially d ischa rg ing and recharging the battery module will reduce its lifetime. It is advis ed that periodically the b attery assembly should have its charge fully cycled i.e. fully discharged and then fully recharged.

4-12 Agilent E4418B/E4419B Service Guide

A8 Rechargeable Battery Assembly

Remove this page and replace with pullout.fm.

Theory of Operation

Agilent E4418B/E4419B Service Guide 4-13

Theory of Operation

A8 Rechargeable Battery As sem bly

4-14 Agilent E4418B/E4419B Service Guide

Replaceable Parts

Introduction

This chapter con tains details of some of the higher level components and assemblies which can be ordered from Agilent Te chnologies. It also details how to assemble and disassemble the power meter for repair.

To order parts co ntact your local Agilent Technolo g ies Sales and S er vice Office. To return your power meter for servicing at a qualified service center refer to

“Contacti ng Agilent Technologies” in chapter 2 of the User’s Guide.

5-2 Agilent E4418B/E4419B Service Guide

Assembly Part Numbers

Replaceable Parts

Assembly Part Numb ers

Reference

Designator

A1 Power Supply Assembly

Refer to “Po wer Supp ly As sembly Types”, on page 5-5 to help with the selection.

Power Supply and Charger Assemb ly (Option 001)

A2 Processor Assembly Kit

New E4418-60031 Refurbished E4418-69028

A301 Front Panel Assembl y for:

Agilent E4418B and Agilent E4418B Option 002

New E4418-61030 Refurbished E4418-69030

A302 Front Panel Assembl y for:

Agilent E4418B Option 003

Description

Agilent Part

Number

0950-2649 or 0950-3681

0950-3681

New E4418-61031 Refurbished E4418-69031

A303 Front Panel Assembl y for:

Agilent E4419B and Agilent E4419B Option 002

New E4419-61001 Refurbished E4419-69001

Agilent E4418B/E4419B Service Guide 5-3

Replaceable Parts

Assembly Part Numbers

Reference

Designator

Description

Agilent Part

Number

A304 Front Panel Assembl y for:

Agilent E4419B Option 003 New E4419-61002

Refurbished E4419-69002 A4 Comms Assembly E4418-60012 A5 Daughter Assembly for:

E4418-60015

Agilent E4418B

Daughter Assembly for:

E4419-60003

Agilent E4419B A6 Measurement Assembly E4418-60007 A7 Fan Assembly E4418-61004 BT1 Lithium (RAM) Battery 1420-0338 BT2 Rechargeabl e Battery Opt 001 E9287A MP1 Bail Handle 34401-45011 MP2 Front Bumper 34401-86011 MP3 Rear Bumper 34401-86012 MP4 Outer Cover for:

Agilent E4418/9B

Agilent E4418/9B Option 001

E4418-61027

E4418-61016 MP5 Rear Bezel E4418-20008 MP6 Instrument Chassis Assembly (Includes

E4418-61025

push-fit line module) MP6J1 Push-F it Line Module E4418-61002 Battery Module Cover E4418-61019 W3 Recorder Output Cable Assy E4418-61015 Sensor Cable Assembly Kit E4418-61036

5-4 Agilent E4418B/E4419B Service Guide

Replaceable Parts

Assembly Part Numb ers

Reference

Designator

Front Power Reference Cable Kit E4418-61811 Rear Power Reference Cable Kit E4418-61813

Description

Agilent Part

Number

Power Supply Assembly Types

Before ordering an A1 Power Supp ly Assembly, check connector J2 and compare it to Figure 5-1 and Figure 5-2 and select the appropriate mod el. The J2 connector is found nearest the fan assembly.

Figure 5-1: 0950-26 49 Powe r Supply Assembly

Figure 5-2: 0950-3 681 Power Su pply and Charger Assembly

Agilent E4418B/E4419B Service Guide 5-5

Replaceable Parts

Front Panel Connector Repair

The front panel assembl y is an exchange assembly. However, if front panel sensor cables or power referenc e cables are faulty they should be replaced by ordering the appropriate kit and following the assembly/di sa ssembly procedure. The instrument accuracy test should then be carried out to verify the functionality of the new part.

5-6 Agilent E4418B/E4419B Service Guide

Replaceable Parts

System

Firmware Upgrades

The power meter’s firmware can be upgraded using a PC. The current firmware is available on the World Wide Web. A firmware upgrade package (Part Number E4418-61035)can be purchased for users who do not have access to the World Wide Web. The upgrade package contains instructions and a disc pack. The firmware can be upgraded via the GP-I B connector or the serial RS232/422 connec tor.

To determine the firmware version in your power meter, press:

• , , , .

Inputs

Contact your local Service Center if you require a firmware upgrade. Refer to “Sales and Service Offices”, on page -ix for details of your local Service Center.

Downloading Firmware

Instrument Firmware should be downloaded after the processor board is repl ac ed. Firmware can be access ed by Agilent Technologies Service Centers using the World Wide Web.

Service Version

Agilent E4418B/E4419B Service Guide 5-7

Replaceable Parts

Assembly and Disassembly Guidelines

The guidelin es in this section describe the removal and rep lac ement of the major assemblies in the Agilent E4418B and AgilentE4419B power meters.

Once an assembly has b een re place d, refer t o “ Post-Re pair Adj ustment s”, on page 3-3 to ensure that the correct performance tests and adjustments are carried out.

WARNING Refer to the safety symbols on the power meter and “Equipment

Operation”, on page -v before ope rating t his powe r met er wit h the cover removed. Failure to comply with the safety precautions can result in severe or fatal injury.

WARNING Before carry ing ou t any ass em b ly or disassembly of the power meter

ensure that you disconnect the power cord. Even with the power meter switch ed off there are potentially dangerous voltages present on the power supply assembly.

Removing the Power Meter Cover

Remove the optional battery if fitted before removing the cover.

When replacing the power meter cover retighten the captive scre ws in th e rear bez el using a 9 lb/in T15 screw driver.

5-8 Agilent E4418B/E4419B Service Guide

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A1 Power Supply Assembly

1. Remove the power supp ly cover by lifting it out.

2. Disconnect the line input module from the chassis and power supply assembly.

3. Disconnect the cable assembly from the power supply which connects to the A2 processor assembly.

4. Unscrew the power supply assembly and lift out the power supply. (When replacing these screws use a 9 lb/in T15 screw driver.)

WARNING When replacing the power supply unit in the power me ter ensure that

all earth wi r ing is reco nnected . T here are two terminals to check:

The first is the force fit connector to the power supply unit itself. It is essential that the gap between the terminal and the adjacent large capacitor is maximized. Fit the connector so that its flat side faces towards the large capacitor. The second, a closed loop terminal bonded to the chassis with an M3.5 machine screw (use a 9 lb/in T15 screw driver).

All the p rotective earth wiring can be identified by the insulation co lor green with a yellow stripe.

Agilent E4418B/E4419B Service Guide 5-9

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A2 Processor Assembly

1. Remove the A5 daughte r and A6 measurement assemblies as described on page 5-12.

2. Move the A2 plastic support bracket to its forward posit ion using the two side levers, unc li p the fle xi-cabl e reta ining ba r on the front pane l keypa d and front panel LCD cable connectors and disconnect the cable.

3. Disconnect the following cables from the A2 processor assembly:

n power reference semi-rigid n fan connector n power supply connector

4. Turn the power meter upside down and remove the three screws as shown. (When replacing these screws use a 6 lb/in T10 screw driver.)

5. Pu sh th e A 2 pro c es s o r assembly to w ar d s the f r on t pan e l to re l ease it from the 50-pin connector. Lift it upwards to remove.

screws

Note When re-assembling the processor board, ensure the A2 plastic support

bracket is returned to its locked position.

Note After repla cing a processor board, the Power Reference Frequency and

Level must be checked. For further informati on refe r to “Pe rform anc e Tests”, on page 2-1.

Note After repla cing a processor board, the display bright nes s and co ntrast must

be adjusted. See “Adjustments”, on page 3-1.

Note Firmware should be downloaded to the instrument after the processor board

is replaced. Refe r to “Downloading Firmware”, on page 5-7.

5-10 Agilent E4418B/E4419B Service Guide

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A4 Comms Assembly

1. Remove the A2 process or, A5 daughter and A6 measurement ass emblies as shown on page 5-10 and page 5-12.

2. Disconnect the line power module from the A1 power supply and the chassis.

3. Disconnect the earth wire screw. (When replacing this screw use a 9 lb/in T15 screw driver.)

4. Remove the two screws on the underside of the deck assembly. Remove the assembly by sliding forward and tilting up from the rear (when replacing these screws use a 21 lb/in T15 screw driver).

screws

5. Unscrew the GP-IB and RS232/422 connectors from the rear panel. (When replacing these screws use a 6 lb/in 9/32 in socket.)

6. Disconnect the Reco rder cable for channel A from J23 pins 1,2,3. Disconnect the Recorder cable for channel B from J23 pins 4,5,6.

7. Lift the A4 Comms assembly from the two standoffs and slide it out.

Agilent E4418B/E4419B Service Guide 5-11

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A5 Daughter or A6 Measurement Assemblies

1. Disconnect the flex circuit from measurement assembly.

Note Care shou ld be taken when disconnecting the fle x circuit from the

measurement assembly.

The flex circuit assembly is released by pushing the conne ctor tab forward and lifting. To replace the flex circuit, loop it as shown on page 5-17, and connect the flex circuit as shown in the figures below.

2. Slide out the measurement assembly from the side of the power meter.

3. The daughter asse mbl y is removed vertically.

1. Connector closed

2. Slide connector clamp in direction of arrow

4. Position sensor flex circuit into connector in direction of arrow

5-12 Agilent E4418B/E4419B Service Guide

6. Push clamp closed in direction of arrow

3. Rotate connector clamp in direction of arrow

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A7 Fan Assembly

1. Remove the A1 power supply ass em bly as shown on page 5-9.

2. Remove the pins whic h attach the fan to the chassis.

3. Remove the fan cable co nnec tor from the A2 processor assembly to release the fan.

Agilent E4418B/E4419B Service Guide 5-13

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the Power Meter RAM Battery (BT1)

1. Remove the A2 process or as sembly as described on page 5-10.

2. Remove the A2J 1 link to disconnect the battery from the rest of the circuitry.

3. Verify the battery protection circuitry by:

n ensuring that there are no electrical short circuits across the battery

terminals.

n ensure that there are no voltages present which could apply a charging

voltage.

4. Once the prot ection circuit has bee n verified remove the battery. The battery is siliconed to the assembly. It may be necessary to remove it using a scalpel.

5. Store the b attery individually in an anti-static (dissipative) ba g or sui table non-conductive packaging.

6. After replacing the battery secure it using a tie wrap. This should be se cured from the top of the A2 proces sor assembly. The recomme nded tie wrap part number is 1400-1154.

7. Replace the A2J1 link.

WARNING This power meter uses a lithium battery which may explode if

mishandled. The battery should not be subjected to short circuit of the battery terminals or to excessive heat.

Do not recharge this battery or dispose of it by burning. Check local country regulatory requirements on the disposal of lithium batteries.

5-14 Agilent E4418B/E4419B Service Guide

Replaceable Parts

Assembly and Disassembly Guidelines

Removing the A3 Front Panel Assembly

1. Disconnect the following cables from the A2 processor assembly:

n power reference semi-rigid (When replacing use the torque s d etailed on

page 5-18.)

n front panel keypad n front panel LCD

Note Care s hould be t aken when dis conne cting the front pan el ke yboard a nd LCD.

Move the A2 plastic support bracket to its forward posit ion using the two side levers, unc li p the fle xi-cabl e reta ining ba r on the front pane l keypa d and front panel LCD cable connectors and disconnect the cable.

2. Disconnect the flex circuit from the measurement assembly.

Note Care shou ld be taken when disconnecting the fle x circuit from the

measurement assembly.

3. Remove the center screw from the right hand side of the front panel.

4. Remove the front pane l by pres sing in the metal tab on the front panel as shown and push down on the side of the chassis until the standoffs are cleared from the holes.

screw

tab

Note After repla cing a front panel assembly, the display brightness an d contrast

must be adjusted. Refer to Chapter 3 “Adjustments”.

Agilent E4418B/E4419B Service Guide 5-15

Replaceable Parts

Assembly and Disassembly Guidelines

Replacing the Front Panel Power Sensor Cable Assemblies

1. Remove the front panel from the power meter. (Refe r to “Removing the A3

2. Replace the power sensor cable assembly(s) using the replac ement kit.

Front panel sensor retaining clip recess

Front Panel Assembl y”, on page 5-15 for details on removing the front panel.)

5-16 Agilent E4418B/E4419B Service Guide

Agilent Technologies e4419b, e4418b User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual