The 1990 Changes in National Reference Standards
Contents
1. HEWLETT PACKARD L D The 1990 Changes in National Reference Standards On January 1 1990 the U S National Institute of Standards and Technol ogy NIST and other national stan dards organizations worldwide made important changes to the assigned values of national reference standards in most countries of the world Calibration and Traceability Regular calibration assures that a measuring instrument meets the user s expectation of performance as defined by the instrument s pub lished specifications To ensure worldwide consistency calibration measurements are referenced trace able to common defining base units in the International System of Units It is the task of the national standards laboratories to maintain measure ment units as practical reference stan dards derived from the base unit defi nitions However experiments made over the past two decades have led to international consensus that the values assigned to certain legal or as maintained standards in most countries are in error On January 1 1990 national laboratories through out the world adjusted these assigned values to eliminate the error Extent of the Change The electrical units affected are the volt and ohm Relationships between the units mean that the ampere and watt are also affected although the change in the watt is likely to be insig nificant to commerce In addition the International Practical2. 003 8562B 24 Temporary resistor pack change no change in operation 003 MR _ 8562B 44 Modification to prevent erroneous divide by two results Error 600 016 8565A 19 Preferred replacement of RF IF motherboard assembly 003 8566B 02 Instructions on installing Option 010 rack mounting slides 003 8566B 12A Installation procedure for 8566AB retrofit kit 003 8568A 44B Installation procedure for 8568AB retrofit kit 003 IO 8569A 13 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006 8569B 10 Modification to prevent 158V fuse from blowing 003 IO 8569B 11 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006 IO 8570A 01 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006 8590A 07A Instructions on removing modifying analyzer display 003 8592A 09 Instructions on removing modifying analyzer display 003 MR 8642A B 09 Ext timebase input impedance mod to prevent intermittent out of lock conditions 008 MR 8642M 02 Modification to correct A11 A12 out of lock errors 002 MR 8644A 01 Firmware upgrade to insure compatibility with exchange modules 012 MR 8645A 01 Firmware upgrade to insure compatibility with exchange modules 012 MR 8656B 08A Modification to improve low frequency loop reliability 006 MR 8656B 08B Modification to improve low frequency loop reliability 008 MR 8657A 01A Modification to improve low frequency loop reliability
3. 010 MR 18177A 02 Modification to increase input sensitivity to meet industry norm 014 MR 34509A B C 01A Modification to prevent relay closure during instrument turn on 015 MR 34509A B C 01 Modification to prevent relay closure during instrument turn on 014 MR 34513C 01 Resolder selected components on the pc board to eliminate intermittent operation 014 MR 34514C 01 Resolder selected components on the pc board to eliminate intermittent operation 014 MA 37204A 01B Mod available to install fiber optic interface upgrade to Opt 003 004 013 or 014 008 37212B 02 Firmware upgrade to improve performance 002 IO 37212B 03 Instructions for ordering firmware part pairs 005 MR 42841A 01 Bias current source control error PS fuse on the A4 board may be blown out 016 MR 44701A 07 New opto isolators to correct ERROR 27 002 MR 44701A 08 Modification to correct SELFTEST error 002 MR _ 44701A 09 Modification to eliminate noisy readings near zero 002 MR 44701A 10 Modification to correct 1st reading following range change 002 MR 44701A 11 Modification to correct inaccurate readings on ACV FUNCTIONS 002 MR 44701A 12 Modification to increase drive signal to new opto isolators 002 1ST QUARTER 1990 WWW HPARCHIVE COM BENCH BRIEFS 11 SN SN Abstract Service Note Type No Package MA 44702A B 07 Modification to include compatibility with 4473X Multiplexers 002 IO 44702A B 08 Service manual corrections to resistance specifications 002 MR 44702A B 09 Modification
4. 08 System Bd svc procedure for logic anal with 10449A ACCENT upgrade kit installed 016 MR 1651A 06 Modification to improve the quality of the CRT display 005 IO 1651A 07 Testing procedure for the Probe Tip Assembly P N 01650 61608 014 IO 1651A 08 System Bd svc procedure for logic anal with 10449A ACCENT upgrade kit installed 016 IO 2804A 04 2804A A2 Oscillator Preset board replacement procedure 011 IO 3235A E 08 New service manual encompasses new hardware accessories 014 MR _ 3235A E 09 New firmware allows the 34516A 256 Crosspoint Matrix Module to pass FTEST 014 IO 3455A 26 HP 9830 and 9825 service cassette tapes are being obsoleted 008 IO 3455A 27 Design change to accommodate obsoleted LED 014 MA 3457A 10 Improved design eliminates mechanical failures of battery 004 IO 3457A 11 HP 85 service cassette tape is being obsoleted 008 MR 3457A 12 Modification to allow 3457 to respond to external trigger esp from the 3497A 015 MR 3458A 01A Modification to improve A D linearity 014 MR 3458A 01B Modification to improve A D linearity during turnover linearity test 015 MR 3458A 01 Modification to improve the A D linearity 009 MR 3458A 02A Fixes changes and enhancements to outguard firmware Rev 3 0 015 MR 3458A 02 Firmware fixes changes and enhancements to outguard ROMs 009 MR 3458A 02 Fixes changes and enhancements to the outguard firmware Rev 3 0 014 MR 3458A 03A Fixes changes and enhancements to outguard firmware Rev 4 0 015 MR 3458
5. HEWLETT PACKARD 1st Quarter 1990 Sp Figure 1 The U S National Conference of Standards Laboratories NCSL sticker for indicating equipment that is calibrated or adjusted to the new unit representations E HP 740A B DC Standard Differen tial Voltmeter m HP 2804A Quartz Thermometer with HP 18110A or HP 18111A Laboratory Probes m HP 2813B C D E Quartz Pressure Probes and Sets m HP 3235A Switch Test Unit with HP 34520A B 6 2 Digit Multimeter Module or HP 34521A B AC DC Source module m HP 3245A Universal Source HP 3420A B DC Differential Volt meter Ratiometer HP 3455A Digital Voltmeter HP 3456A Systems DVM HP 3457A Multimeter HP 3458A Multimeter HP 3478A Multimeter HP 3497A Data Acquisition Control Unit with Option 001 HP 44420A 5 2 Digit DVM and Current Source m HP 3852A Data Acquisition Control Unit with HP 44701A 5 to 3 Digit Integrating Voltmeter See Reference Standards page 16 Hewlett Packard 1990 Service Tip Attention HP 8757C E Network Analyzer Owners Editor s Note This service tip also applies to many other instruments that use the new 7 5 inch color monitor As with all color monitors these dis plays are very susceptible to external magnetic fields These fields can origi nate from many sources including metal frame tables and from the earth itself The usual symptom is a discol oration or slight dimming of the dis play usually near the top left hand c
6. Notification to disconnect pwr cord before rem inser A41 43 to prvnt fuse fail 005 IO 3746A 31 Correction to part of the Weighted Filter Option 016 specification 005 MR 3746A 32 Two resistor changes to make the A99 Motherboard backward compatible 005 IO 3746A 33 Correction to the Tracking Generator A54 Option 012 adjustment procedure 005 IO 3746A 34 Preferred replacement for the fractional N integrated circuit A30U16 010 IO 3750A 01 Correction to frequency accuracy specs in 3750A Op Note 005 MR 3762A 10 Modification to clock and data amplitude range 016 IO 3776A 34 Notification of preferred replacement RAM due to parts unavailability 005 IO 3776A 35 Preferred replacement for capacitor A5C107 on the A5 transients assembly 007 IO 3776B 41 Notification of preferred replacement RAM due to parts unavailibility 005 IO 3776B 42 Notification of preferred replacement IC on assembly A102 005 IO 3776B 43 Preferred replacement for capacitor ASC107 on the A5 transients assembly 007 IO 3779A 35 Recommended replacement procedure for rear signaling panel sub assembly 008 IO 3779A 60 Recommended alternative test equipment for 3779A performance tests 015 IO 3779B 36 Recommended replacement procedure for rear signaling panel sub assembly 008 IO 3779B 64 Recommended alternative test equipment for 3779B performance tests 015 3779C 41 Recommended replacement for High line voltage protection circuit 002 MA 3779C 42 Instructions on converting 3779C Opt 003 to 377
7. Window Bezel now combined under one part number 03787 60073 005 IO 3787B 06 New fan filter can be retrofitted to older instruments 008 IO 3787B 07 Instructions for retrofitting Option 002 Low Voltage DC Supply to standard inst 015 IO 3787B 08 Instructions for building and testing DDS bit byte clock generator assembly 015 MA 3789B 04 Modification to eliminate noise from the input port 015 MR 3789B 05 Recommended PROM Update Kit Firm 1 to improve performance 016 MR 4062C UX 01 Modification to prevent power supply cable damage of the 4142B 015 MR 4142B 03 Modification to prevent power supply cable damage 015 IO 4191A 25A Recommended replacement for the A20 Microprocessor Digital Control Board 013 IO 4191A 25 Recommended replacement for the A20 Microprocessor Digital Control Board 012 IO 4191A 26 Repair method for the A20 Microprocessor Digital Control Board 013 IO 4192A 20A Repair method for A6 Microprocessor Digital Control Board 016 IO 4192A 20 Repair method for the A20 Microprocessor Digital Control Board 013 MR 4195A 01A Firmware upgrade to that the HP 4195A Adjustment Program will work 008 IO 4195A 02A Cable length selection is not needed 008 MA 4195A 03 Mod to improve local osc purity and color dump capability for PaintJet Printer 008 MR 4195A 04 A11 Input Attenuator Boards must be replaced when any of them are replaced 016 IO 4276A 04 Instructions for replacing a fuse resistor with a fixed resistor 016 IO 4277A 08 Instructions for replacing a fu
8. and procedures for troubleshooting maintenance and repair Service Notes are published as appropriate throughout the life of a product All new notes are an nounced in Bench Briefs Please note that Hewlett Packard has restructured the procedure for hand ling and distributing instrument re lated service notes through Bench Briefs and the microfiche program 1ST QUARTER 1990 Bench Briefs If you want to order a service note refer to the list of service notes in the index find the service note number belonging to the product you are in terested in and note the package number Use the form on the last page of Bench Briefs to order the number that appears in the service note pack age column You will receive a pack age of service notes that includes the one you ordered Microfiche Service notes are still available on microfiche The part numbers are WWW HPARCHIVE COM 5951 6511 5951 6517 Library Update service Please note that automatic shipments of the update service will no longer be made If you want to continue to receive quarterly updates to the microfiche library you must place a new order during the first month of each quarter May August November February Note that in ventory will be purged at the end of each quarter Contact your local HP sales service of fice for more information BENCH BRIEFS 5 1989 Bench Briefs Instrument Service Note Index SN SN Abstr
9. date On Specified Failure The modification will be performed by the HP support organization only if the specified failure occurs These modifications will normally be performed as routine support The No Charge period is a minimum of two years from the service note publication date Agreeable Time The modification is made by the HP support organization at a time agreeable to HP and the customer A mutually agreed upon time may 14 BENCH BRIEFS occur as part of preventative maintenance calibration or in response to a general failure condition Product safety and modification recommended service notes for products covered by an HP on site support agreement are to be provided by HP support personnel during the next visit to the customer s site or by the recommended completion date The maximum expected time to complete the modification is one year from the service note publication date Location Category On Site The modification is performed by HP qualified support personnel at the customer s site HP Location The customer is responsible for returning the product to the nearest HP Customer Service Center The modification is performed by HP qualified support personnel Customer Installable Modifications may be performed by the customer Parts and modification instructions may be provided at no charge depending on the service note classification Availability PS SA MR Only This is the defined period of time
10. date 87 is the James Davey paper on the 5 pole quarter wave hairpin filter with a follow up paper printed in the 1988 Microwave Conference Proceed ings Each of these proceedings can be purchased for approximately 10 00 from the American Radio Relay League in Newington Connecticut I hope this information will be of some help I look forward to hearing from Mr Kristiansen 1ST QUARTER 1990 Safety Related Service Notes Service notes from HP relating to per sonal safety and possible equipment damage are of vital importance to our customers To make you more aware of these important notes they are printed on paper with a red border and the service note number has an S suffix In order to make you im mediately aware of any potential safety problems we are highlighting safety related service notes here with a brief description of each problem Also in order to draw your attention to safety related service notes in the service note index each appropriate safety related service note is high lighted with a contrasting color HP 435B Power Meter Option 903 or 918 Product Safety Service Note 435B 04 S applies to HP 435B Power Meters with serial numbers 2732U04341 2732U04700 This note requests the user to check that the line fuse is the correct value for 100 115 volt operation The fuse should be rated as a 100mA Slo Blo HP P N 2110 0234 HP 436A Power Meter Option 903 or 918 Product Saf
11. that all resources parts documentation expertise will be available for the modification This is not the No Charge period Note that the modification may be incorporated into updated versions of the product Author and Entity This is the person that wrote the service note and the manufacturing division Labor Standards PS SA MR Only This is the expected amount of time it will take to complete the repair Performance Enhancement MA Only The modification will enhance the performance of the product over and above what it was originally designed to do This modification is available for customer purchase Serviceability Reliability Enhancement MA Only The modification improves reliability or allows HP to service the product more efficiently If the product is covered by an HP support contract the modification is charged to the contract Otherwise the customer may purchase the modification 1ST QUARTER 1990 WWW HPARCHIVE COM Service Inventory Used Parts Until Self explanatory This is the last date that HP will provide the modification to the customer at no charge This is Responsible Entity called the No Charge period This is the support responsible HP entity This is not the entity that performs the service Summary of Service Note Payment Conditions Table A Customers With HP On Site Service Contracts Mod Available Serviceability _ Reliability Mod Available Performa
12. the battery charger assembly 006 MR 4937A 02C Loop start and noise to ground modification 002 IO 4947A 09 Notification of preferred replacement RAM due to parts unavailability 005 IO 4947A 10 Preferred replacement for capacitor ASC107 on the AS transients assembly 007 MA 4948A 08 Preferred replacement for NMOS RAMs on A9 assembly 010 IO 4951A 19 Recommended replacement resistors if the display is dim 016 IO 4951B 04 Recommended replacement resistors if the display is dim 016 MR 4951C 08 Keyboard shift control anomaly 001 MR 4951C 09 Instructions on replacing capacitors C43 and C83 006 8 BENCH BRIEFS WWW HPARCHIVE COM 1ST QUARTER 1990 SN SN Abstract Service Note Type No Package IO 4951C 10 Procedure corrects disk not fomatted error caused by head misposition 013 MA 4951C 11 Firmware revision 5 0 adds features around disk operation 014 MR 4952A 04 ASYNC clock fix 001 MR 4952A 05 Replace A1U302 modulators that have bad date codes 001 MR 4952A 06 Polarity reversed capacitor in deflector circuit causes vertical deflection prob 010 IO 4952A 07A New redesigned POD interface cable for the 4952A only 014 IO 4952A 07 New redesigned POD Interface Cable for the 4952A only 013 MR 4952A 08A Modification to improve the current output of the power supply 014 MR 4952A 08B Modification to improve the current output of the power supply 016 IO 4952A 09 Option A4 memory DRAM change 013 IO 4952A 10 Procedure corrects disk not formatted error cau
13. 008 MR 8657A 01 Modification to improve low frequency loop reliability 006 MR 8665A 01 Firmware upgrade to insure compatibility with exchange modules 012 MR 8673B 13A Connector modification to improve power supply reliability 003 MR 8673C 14A Connector modification to improve power supply reliability 003 10 BENCH BRIEFS WWW HPARCHIVE COM 1ST QUARTER 1990 SN SN Abstract Service Note Type No Package MR 8673D 15A Connector modification to improve power supply reliability 003 MR _ 8770A 17 Modification to prevent external clock from modulating internal 125 MHz VCXO 004 MA 8770A 18 Improved line switch resists breakage 014 MA 8780A 05A A2 RF Output Amplifier troubleshooting and replacement procedure 013 MA _ 8780A 05 A2 RF Output Amp troubleshooting amp replacement procedure 002 MR _ 8780A 06 AC line fuse modification increase in current rating 005 MA 8780A 07A Troubleshooting and replacement procedure for A7 FM BB relays A7A2K1 K6 006 MA _ 8780A 07 Instructions on troubleshooting and replacing A7A2K1 K7 relays 005 IO 8780A 08 A change has been made to the front panel assembly to eliminate unnecessary parts 007 IO 8903B 04 Description of exchange program for A2 input amplifier assembly 003 MR 8903B 05 Modification to prevent electrical damage to input circuitry 014 IO 8903E 04 Description of exchange program for A2 input amplifier assembly 003 MR 8903E 05 Modification to prevent electrical damage to input circuitry 014 MA 8970A 10
14. 8513A 03 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 MA 8514A B 01 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 MA 8515A 03 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 MA 8516A 04A Improved frequency converter requires new bias supply 008 MA 8516A 04 Improved frequency converter requires a higher bias supply voltage 006 MA 8516A 05 Modification to add step attenuators to 8516A standard or Option 003 models 009 MA 8516A 06 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 8552B 10A Assembly instructions for 8500 Series amp 140T 141T Display 003 IO 8557A 09A Instructions on ordering replacement bandwidth filter board assemblies in kit form 006 8559A 11 Modification kit to make 8559A compatible with 853A Display 003 IO 8559A 33 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006 8562A 02C ROM upgrade kit with latest firmware 003 8562A 23 High voltage warning 003 8562A 24 Modification to improve phase noise 003 8562A 25 Temporary resistor pack change no change in operation 003 8562A 28 Option 026 YTF compatibility with TAM 003 MR 8562A 47 Modification to prevent erroneous divide by two results Error 600 016 8562B 01C ROM upgrade kit with latest firmware 003 8562B 22 High voltage warning 003 8562B 23 Modification to improve phase noise
15. 9 Equipment menu addressing clarification 016 85629A 02 Modification to prevent DAC voltage reference drift 003 85629A 03 Modification to prevent TAM analyzer mechanical interference 003 85629A 06 8562A Option 026 YTF compatibility description 003 MR 85629A 07A Modification that upgrades an HP 85629A to an HP 85629B 009 SA 85901A 01 S Modification to make sure inverter output is off when inverter switch is off 011 IO 86601A 12 Rec replacement meter kit for the 8660 System RF Section Plug In 015 IO 86602B 07 Rec replacement meter kit for the 8660 System RF Section Plug In 015 IO 86603A 09 Rec replacement meter kit for the 8660 System RF Section Plug In 015 IO 86632B 03 Rec replacement meter kit for the 8660 System Modulation Section Plug In 015 IO 86633B 02 Rec replacement meter kit for the 8660 System Modulation Section Plug In 015 IO 86634A 01 Rec replacement meter kit for the 8660 System Modulation Section Plug In 015 IO 86635A 02 Rec replacement meter kit for the 8660 System Modulation Section Plug In 015 MA 86792A 01 Firmware history and upgrade procedures 016 Service Note Types IO Information Only MA Modification Available MR Modification Recommended SA Safety PR Priority Safety Pre Dec 1988 Format Hewlett Packard Service Notes Have Changed Introduction As products continue to be produced modifications are made to their design or to the manufacturing process Some of these modifications may be judged significa
16. 9C Opt 001 or 002 010 3779D 41A Modification to convert Option 002 to Option 001 002 3779D 46 Recommended replacement for High line voltage protection circuit 002 MR 3780A 35 Modification to correct failure of smoothing capacitors 013 MR 3781A 06 Modification to correct failure of smoothing capacitors 013 MR 3781B 12 Modification to correct failure of smoothing capacitors 013 MR 3782A 08 Modification to correct failure of smoothing capacitors 013 MR 3782B 13 Modification to correct failure of smoothing capacitors 013 IO 3785A 22 Replacement 1826 0252 for the DAC A35U27 amp A38U11 has better linearity 007 MR 3785A 23 Recommended modification if receiver lock fails on 8 MHz of 34 MHz bit rates 007 MR 3785A 24 Modification to correct failure of smoothing capacitors 013 3785B 18A Modification to improve reliability 002 IO 3785B 20 Replacement 1826 0252 for the DAC A35U27 amp A38U11 has better linearity 007 MR 3785B 21 Recommended modification if receiver lock fails on DS2 or DS3 bit rates 007 MR 3785B 22 Modification to correct failure of smoothing capacitors 013 MA 3787B 03A Instructions for adding DS1 Jitter Measurement option to 3787B units 010 MA 3787B 04C How to order and install new firmware that adds new features to old units 010 1ST QUARTER 1990 WWW HPARCHIVE COM BENCH BRIEFS 7 SN SN Abstract Service Note Type No Package MA 3787B 04D Additional features that can be retrofitted to older instruments 014 IO 3787B 05 CRT
17. A 03 Fixes changes and enhancements to the outguard firmware Rev 4 0 014 IO 3466A 17 Notification of slight change in accuracy specification 20 ohms range 015 MA 3466A 18A Modifications that improve ESD and overvoltage protection of multimeters 010 6 BENCH BRIEFS WWW HPARCHIVE COM 1ST QUARTER 1990 SN SN Abstract Service Note Type No Package MA 3466A 18 Mechanical and electrical design change to improve ESD amp overvoltage protection 008 IO 3466A 19 Slight change in accuracy specification 20 Ohms Range 016 IO 3468A B 05 HP 85 service cassette tape is being obsoleted 008 IO 3478A 08 HP 85 service cassette tape is being obsoleted 008 IO 3497A 30 HP 85 service cassette tape is being obsoleted 008 MR _ 3498A 05 Modification to reduce crosstalk in outguard decoder lines 009 IO 3552A 17A Preferred replacement for 12V battery packs requires resistor changes 010 MR 3565S 06 Mod to A5 Pwr Supply controller so that system powers up with 8 boards installed 015 MR 3708A 09A PROM retrofit kit 03708 60006 is a preferred replacement for PROM failures 007 MR 3708A 14 Test switch replacement to prevent intermittent blanking of front panel display 008 IO 3708A 15 Simplification of performance test tables 4 4 amp 4 5 in the HP 3708A Service Manual 008 IO 3708A 16 Service manual correction to insert additional step in Performance Test 4 30 015 IO 3709B 03 Preferred replacement for the Timer IC A2U9 on the Analogue Assembly 008 IO 3746A 30
18. A Modification to improve leveling amplifier gate bias adjustment range 003 MR 70905A 06 How to change the module verification limit Related to sampler IF ac output 007 IO 70905A 07 Equipment menu addressing clarification 016 MR 70905B 03A Modification to improve leveling amplifier gate bias adjustment range 003 MR _ 70905B 04 How to change the module verification limit Related to sampler IF ac output 007 IO 70905B 05 Equipment menu addressing clarification 016 MR 70906A 04A Modification to improve leveling amplifier gate bias adjustment range 003 MR 70906A 06 How to change the module verification limit Related to sampler IF ac output 007 IO 70906A 07 Equipment menu addressing clarification 016 MR _ 70906B 03A Modification to improve leveling amplifier gate bias adjustment range 003 12 BENCH BRIEFS WWW HPARCHIVE COM 1ST QUARTER 1990 J 1ST QUARTER 1990 SN SN Abstract Service Note Type No Package MR 70906B 04 How to change the module verification limit Related to sampler IF ac output 007 IO 70906B 05 Equipment menu addressing clarification 016 MR 70908A 04A How to change the module verification limit Related to sampler IF ac output 015 MR 70908A 04 Change module verif sampler IF AC output limits to match factory test limits 013 MR 70908A 04 How to change the module verification limit Related to sampler IF ac output 007 MR 70908A 05 Revision to the 70908A Module Verif Multiplier Power Leveling Adjustment test 007 IO 70908A 0
19. B Isolator replacement kit improves measurement repeatability 006 MA _ 8970A 10B New Isolater replacement kit 08970 60035 improves measurement repeatibility 007 MR 8970B 03B New FL19 filter improves measurement repeatability 007 MA _ 8970B 04 Modification to increase 5 Vdc power supply range 004 IO 8970B 05 Preferred replacement for diode A14CR4 005 IO 8980A 01 Firmware and A17 RAM Assembly replacement strategy 006 MA 8980A 02 Mod to CRT switch board assy to improve reliability of X Y Z cable connections 012 IO 8981A 01 List of firmware revisions 004 MR E1220A 01 Modification to prevent timing edge displacement caused by crosstalk 015 MR E1222M 01 Modification to prevent timing edge displacement caused by crosstalk 015 MR 11990A 01A Modifications to User Interface Software for HP 70900A System Performance tests 006 MR 16500A 05A New cooling fans contain thermal lock rotor protection circuitry 014 MR 16500A 06 Modification to prevent instrument from randomly cycling power 005 IO 16500A 07 Instructions on component level repair of touchscreen 010 MR 16500A 08 New cooling fans containing thermal lock rotor protection circuitry 016 IO 16510A 01 Testing procedure for the Probe Tip Assembly P N 01650 61608 014 MR _ 18160A 01B Modification to prevent turn on and or PV loop POD errors 014 MR _ 18160A 01 Modification to prevent TURN ON and or PV LOOP POD errors 005 MR _ 18177A 01A PODs associated with 4951C 52A products have misloaded capacitors in power reg
20. Temperature Scale 1968 IPTS 68 is being rede Pub No 5952 0135 fined Minor changes are being made to the standards of capacitance and mass maintained in some countries however the magnitude of these ad justments like the watt is only of academic interest to most users In most countries an increase in the volt of 8 1 parts per million ppm oc curred In the U S A the increase of 9 3 ppm and in France 6 7 ppm All values of dc and ac voltage were af fected equally in any one country The ohm changed value in all countries except Australia by different amounts typically an increase of 1 to 2 ppm All values of resistance are equally affected The IPTS 68 became the International Temperature Scale 1990 The change is rather more complex than for the electrical units Both the magnitude and polarity of the changes vary throughout the scale Hewlett Packard recommends that you seek further information regard ing all of these changes through the national standards laboratory from which the traceability of your mea surements is gained Affected HP Equipment Most equipment is not noticeably af fected Affected applications are those where measurement accuracies are within 10 times the magnitude of the change The following HP prod ucts have specified accuracies that are compromised and HP recommends that they be calibrated to the new standards WWW HPARCHIVE COM bilite SERVICE INFORMATION FROM
21. act Service Note Type No Package IO 141T 14 Description of line filter kits available as replacements for obsolete line filters 006 IO 432C 05 Graylex Industries offers to repair defective front panel meter display module 004 IO 435A 07A Preferred replacement for capacitors A3C13 and A3C14 013 SA 435B 04 S Need to install correctly rated fuse for 100 115 volt operation 012 IO 435B 04 Preferred replacement for capacitors A3C13 and A3C14 013 SA 436A 13 S Need to install correctly rated fuse for 100 115 volt operation 012 MA 436A 14 Modification to improve high speed communications 004 IO 436A 15 Preferred replacement for capacitors A8A1C13 and A8A1C14 013 MA 436A 16A Recommended replacement display driver assembly 015 IO 436A 16 Obsolete display driver HP P N 1820 1361 is no longer available 014 MA 437B 01 New replacement capacitors for the old Polystyrene capacitors 013 IO 437B 02 Preferred replacement for capacitors A4C38 and A4C39 013 MR 438A 05A Firmware upgrade to enhance accuracy in MNL FILTER mode 002 SA 438A 07 S Need to install correctly rated fuse for 100 115 volt operation 012 MR 438A 08 Firmware upgrade to correct certain malfunctions 002 MA 438A 09 New replacement capacitors for the old Polystyrene capacitors 013 IO 438A 11 Preferred replacement for capacitors G1A1C13 and G1A1C14 013 MR 1650A 06 Modification to improve the quality of the CRT display 005 IO 1650A 07 Testing procedure for the Probe Tip Assembly P N 01650 61608 014 IO 1650A
22. aight across I hope these tips can help others Referenced Microstrip Filter Articles Are Located Editor s Note The following letter was received from Mr J H Davey WA8NLC It provides an update on where to find the filter articles referenced in the 1st Quarter 1989 issue of Bench Briefs Dear Editor Thought I had better write and give you information on the location of the filter articles references in Bench Briefs The article written by Jerry Hinshaw N6JH appeared in the January 1985 WWW HPARCHIVE COM issue of Ham Radio Magazine It de scribed round rod interdigital filters as opposed to microstrip filters Rick Campbell KK7B has published several similar articles on bandpass filters and how a microwave local os cillator can be built with a diode mul tiplier However none have ever ap peared in Ham Radio Magazine His earliest article was in the Proceedings of 1296 2304 Conference which is not available in print Luckily much of the material was repeated in later papers A No Tuning Crystal Controlled Microwave Local Oscillator Pro ceedings of the 21st Conference of the Central States VHF Society July 1987 Publication 76 of the American Radio Relay League ISBN 0 87259 066 6 9 and 13 cm Transverters Proceed ings of Microwave Update 87 Sep tember 1987 Publication 78 of the American Radio Relay League ISBN 0 87259 068 2 Also included in the Microwave Up
23. been introduced to explain HP s on site instrument service offerings The two new pieces are m HP SuccessLine Service technical data sheet for on site instrument and measurement systems HP P N 5952 1512 m On Site Calibration Service data sheet HP P N 5959 2595 The HP SuccessLine Service data sheet describes on site instrument and measurement system repair service and provides details on repair agree ment services features benefits and specifications The On Site Calibration Service data sheet describes HP s line of on site calibration agreements including both commercial as well as military standard levels of service This docu ment supersedes a previous data sheet HP On Site Military Standard Calibration Service with the same HP part number For more information on Hewlett Packard s on site instrument and measurement system service pro grams contact your nearest HP sales service office Updated Customer Service Center Guide is Now Available The February 1990 edition of the HP Customer Service Center Guide is now available The guide contains prices for all return to HP contract and per incident services for instruments and office products and peripherals Also included is the recommended calibra tion cycle period for each applicable product The prices in the book are effective February 1 1990 New for this edition is a reader feed back form that we hope will provide a bas
24. ety Service Note 436A 13 S applies to HP 436A Power Meters with serial numbers 2709U04803 2709U05040 This note requests the user to check that the line fuse is the correct value for 100 115 volt opera tion The fuse should be rated as a 750mA Slo Blo HP P N 2110 0063 HP 438A Power Meter Option 903 or 918 Product Safety Service Note 438A 07 S applies to HP 438A Power Meters with serial numbers 2804U00846 2804U00976 This note requests the user to check that the line fuse is the correct value for 100 115 volt opera tion The fuse should be rated as a 1 0A Slo Blo HP P N 2110 0001 HP 85901A AC Power Source Product Safety Service Note 85901A 01 S applies to HP 85901A sources with serial numbers 2845K00101 2906K00240 This note describes how an inductor causes a large voltage transient at turn on and turn off which might be sufficient to destroy a diode in the inverter circuit If the diode is destroyed the inverter switch will not turn the inverter off The inverter indicator LED continues to indicate that the inverter is on The repair procedure involves remov ing the inductor and replacing the diode Order the service note for further instructions ae ie BENGH BRIERS Padua WOU INDIN Important Notice about Service Notes Service notes contain product specific service information for Hewlett Packard s electronic products Sub jects include product improvements modifications
25. his new stan dard recommending you take precau tions to ensure that instruments used for stringent applications be cali brated to the new standards Since January 1 1990 each newly purchased HP instrument and each HP instrument calibrated to the new standard excluding temperature and pressure products is clearly marked with the internationally agreed label shown in Figure 1 All new HP cali bration certificates also report that the instrument is calibrated to the new standard Recalibration of tempera ture and pressure products became available as of April 1 1990 Customers can continue to use instru ments calibrated to the old volt by scaling the results in a computer after taking the measurement You can also continue to use the instru ment with its old calibration if your application can tolerate the additional 9 3 ppm error For example assum ing a perfectly stable voltmeter cali brated in the U S A after January 1 1990 with NIST traceability measured values will appear to be 9 3 ppm lower than those made prior to the introduc tion of the new standard We look forward to working with you to ease the transition to the new standards in any way we can If you have any questions concerning cali bration and your HP products please contact your nearest HP sales service office Service Note Order Form If you want to order a service note refer to the list of service notes in the
26. index and find the service note number belonging to the product you are interested in Using the form on this page order the number that ap pears in the service note package column You will receive a package of service notes that includes the one you ordered Hewlett Packard Bench Briefs 100 Mayfield Ave Mtn View California 94043 16 BENCH BRIEFS NAME COMPANY NAME EE ADDRESS CITY STATE Service Note Packages o 001 O 005 O 009 O 013 002 O 006 O 010 O 014 c 003 007 g 011 LJ 015 oO 004 O 008 O 012 g 016 90199668 JAMES BECHTOLD ME N rae 54306 All rights reserved Permission to reprint Bench Briefs granted upon written request to the Editor WWW HPARCHIVE COM BB 3 90 ZIP eS a Please photocopy this order form if you do not want to cut off the page Bulk Rate U S Postage PAID Santa Clara CA Permit No 80 Q Printed in U S A 1ST QUARTER 1990
27. is for continued improvement of the guide As in previous editions the front section of the guide des cribes the various repair and calibra 1ST QUARTER 1990 tion services available at HP Cus tomer Service Centers and sum marizes service features in handy selection guides The book includes a tear out short form exhibit that cus tomers can complete and mail in to initiate a service contract The remain der of the book lists in three sections commercial instrument service prices MIL STD 45662 instrument service prices and office product service prices Contact your local HP sales service of fice for a copy of this guide HP P N 5954 9715 WWW HPARCHIVE COM LO Preston HP Customer Service Center Guide February 1990 ES Prices Onty BENCH BRIEFS 3 READERS More on Fabricating Breadboard Circuits with Copper Tape Copper Tape Update Editor s Note The following letter was received from Bernie Coler an HP em ployee and Bench Briefs reader Dear Editor Many thanks for Bench Briefs one of my favorite HP periodicals and for the latest article on using copper tape for breadboarding I have used this technique for many years to construct breadboards for my hobby Ham Radio and want to pass along a few tips Copper tape of 1 inch or inch width can be tricky Cutting smooth uni form width strips is neither easy nor inconsequential There are several sources of co
28. nce i Customer Installable Mod Available Serviceability Reliability Mod Available Performance Notes 1 Service will be performed on site at No Charge to the customer 2 Parts and labor are No Charge to the customer when the customer returns the unit to an HP Customer Service Center for repair If the customer requests on site service the service will be performed at No Charge to the customer Travel will be paid by the customer 3 The modification can normally be completed by the customer If the customer requests HP to perform the service the service will be performed at No Charge to the customer but will be performed as routine support 4 The modification can normally be completed by the customer If the customer requests HP to perform the service the service will be performed at No Charge to the customer but will be performed as routine support Travel will be paid by the customer 5 If authorized for On Specified Failure the No Charge period is 2 years all others are 1 year J 6 Ifthe customer has a return to HP service contract labor and parts are charged to the contract when the customer returns the unit to an HP Customer Service Center for repair 7 Customer may purchase the modification 1ST QUARTER 1990 WWW HPARCHIVE COM BENCH BRIERS 15 Reference Standards continued from page 1 Application In 1989 a letter was sent to all HP customers affected by t
29. nge prevents false failure of PV test 3 16 Minimum Input Test 016 MR 54501A 01 Modification to eliminate erratic operation of the rotary pulse generator 005 IO 54501A 02 How to prevent erroneous test failures during self test and or self calibration 005 MR _ 54501A 03 Modification to replace loose bottom shield which may cause cal self test failure 005 MR _ 59309A 09 Modification to prevent loss of time under momentary ac power fluctuations 007 70205A 07 Modification to prevent continuous bright dot flash failure 003 70205A 08 Modification to improve intensity adjustment range 003 MR _ 70300A 02 Modification to prevent amplitude modulation on the output oscillations in A4 PS 008 MR _ 70300A 03 Modification to improve flatness high frequency slope correction 007 MR _ 70810A 01 Firmware upgrade kit is now available for the 70810A Lightwave Section 013 IO 70810A 02 Firmware version 89031 earlier not compatible with HP 70004A Inst Keypad 016 MR 70900A 19 New FFS housing prevents intermittent FFS failures 007 MR 70902A 03 Change module verif s w to eliminate ERROR 31 related to 3 MHz IF calibration 013 MR 70903A 02 Change module verif s w to eliminate ERROR 31 related to 3 MHz IF calibration 013 MR 70904A 04A Modification to improve leveling amplifier gate bias adjustment range 003 MR 70904A 06 How to change the module verification limit Related to sampler IF ac output 007 IO 70904A 09 Equipment menu addressing clarification 016 MR 70905A 04
30. nt enough that they are documented in a service note and communicated to the Hewlett Packard support organization and to Hewlett Packard customers These modifications may include hardware changes firmware changes or simple information There are five classes of service notes used to communicate the modifications The class of service note is determined by the scope of the modification WWW HPARCHIVE COM Each class of service note and the type of information it may contain is described below Service Note Classifications Priority Safety PS This class of service note denotes a serious operator hazard concerned with the normal operation of the product These service notes require immediate repair action and involve a special effort to contact all customers that own the product The repairs must be completed by HP qualified personnel either on site or at an authorized HP repair center Safety SA This class of service note denotes a minor or marginal safety hazard It can also apply when noncompliance to a safety related standard license or testing agency evaluation has been discovered Safety service notes are implemented during the normal course of providing support The BENCH BRIEFS 13 repairs can sometimes be implemented by the customer Modification Recommended MR These service notes are developed to correct manufacturing or design problems that affect product performance or reliability This includes modificati
31. on 001 Time Base specification change 014 MR _ 5343A 29 Modification to prevent A1 Display assembly from giving erroneous indications 014 IO 5343A 30 Instructions on troubleshooting 350 MHz miscounting problems 013 IO 5371A 01A Content description for the Support Service Kit P N 05371 67001 013 IO 5371A 11 Possible modifications that might have to be made when the A5 board is changed 009 IO 5371A 12 Notification that the operation verification voltage readings are approximate 013 MR 53714 13 Modification to ensure operation of oven oscillator in standby mode 016 IO 6621A 07 Replacement PC board changes 002 IO 6621A 08 Modification to correct microprocessor hangup 002 IO 6622A 05 Replacement PC board changes 002 IO 6622A 06 Modification to correct microprocessor hangup 002 IO 6623A 08 Replacement PC board changes 002 IO 6623A 09 Modification to correct microprocessor hangup 002 IO 6624A 06 Replacement PC board changes 002 IO 6624A 07 Modification to correct microprocessor hangup 002 IO 6627A 01 Modification to correct microprocessor hangup 002 1ST QUARTER 1990 WWW HPARCHIVE COM BENCH BRIEFS 9 SN SN Abstract Service Note Type No Package MR 8406A 04 Line voltage clarification 002 IO 8477A 03 Preferred replacement for A1Qll and A1Q18 transistors 013 MA 8511A 02 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 MA 8512A 05 Mod kit to add IF switching capabilities for multiple test set oper w 8510Bs 011 MA
32. ons that correct a product s performance to meet its published specifications This type of service note is also applicable if the modification to replacement parts results in a compatibility problem with units in the installed base Modification Available MA These service notes communicate performance enhancements The enhancements typically improve the performance serviceability reliability or operation that extends the usefulness of the product Information Only IO The information only service note is used to communicate information about the product i e manual changes recommended replacement parts parts that are no longer available and have been replaced by a new HP part number etc In some cases modifications are necessary when a new replacement component is not an exact fit Service Note Administrative Block Each service note contains administrative information that provides the HP support organization details that include when to perform the modification where to perform the modification and how long the modi fication will be available at no charge Action Category Immediately Typically this category is used for priority safety service notes but may also be checked on a modification recommended note Modifications will usually be performed by the HP support organ ization The No Charge period is a minimum of one year from the date that is printed on the service note which is called the publication
33. orner of the CRT In extreme cases a total color shift may be observed for example a trace that was red may shift to green This does not indicate any problem with the display it is characteristic of all color displays In fact you can take a perfectly good display turn it upside down on a metal table and usually see some dis coloration This is most visible while viewing a solid red test pattern While every effort is made to ensure the display is free of any residual mag netism changing the instrument s lo cation or orientation may affect magnetic fields enough to cause color purity problems This may be espe cially noticeable in the southern hemisphere Generally the built in degaussing coil which is engaged each time the unit is turned on is sufficient to maintain color purity In some cases especially after the instru ment is moved or repositioned it may be necessary to cycle the power sev eral times to regain color purity If the automatic internal degaussing is insufficient to regain color purity the CRT will have to be degaussed using a commercially available CRT degaussing coil If a commercial de gaussing coil is not available a bulk magnetic tape eraser such as Radio Shack 44 232 19 95 can be used if it is held about four inches from the face of the CRT Only bring it closer than four inches if this distance is in sufficient to regain color purity If none of these are available an elect
34. pper tape of widths 6 1 and or 4 inches In the U S such sources are hobby shops where these tapes are sold to hobbyists with in terests in model railroading and or doll house construction The copper strips are used as wiring for lighting control etc This tape is also sold through electronic parts distributors for PC board building However I have found that the hobby shops sell the tape at much lower prices with no difference in quality that is discernible to me Depending upon board thickness and material I ve found that either the 4 inch or 4 inch varieties will provide good 50 ohm impedance match at fre quencies up through mid S Band The 16 inch strips are used for bias inputs because they match much higher im 4 BENCH BRIEFS pedance levels Note that these condi tions hold for single side copper plated PC boards with the solid cop per acting as the stripline ground plane When undercutting copper from around a hole using a standard drill bit can cause problems Because of the angle of the tip of the drill bit the result can often be torn copper hole enlargement and or damage to sur rounding areas Copper has always been a difficult metal to machine A recommended solution is to use a inch diameter end mill These end mills are commonly available and will fit the chuck of most drill presses An acceptable alternative is to grind the angled tip of a standard inch drill bit until the tip is str
35. ric pencil sharpener will usually act as a reasonably good substitute for a de gaussing coil Use the electric pencil sharpener in the same manner as pre viously described For best results the CRT should be degaussed in the exact position in which it will be used Always make sure any magnetic tapes or disks are removed from the immediate area or you may demagnetize more than just the CRT In summary we recom mend that you do not replace any color display for color purity or mis convergence problems unless it has first been completely degaussed using one of the above methods Service Tip HP 5371A Service Kit Provides Everything You Need to Service and Learn the HP 5371A Frequency and Time Interval Analyzer The HP 5371A Service Kit which in cludes manuals is now available to aid in servicing the HP 5371A Fre quency and Time Interval Analyzer Note that the service manual and kit do not come with the HP 5371A but must be ordered as options when pur chasing the instrument or later as part numbers The service kit must be used in order to perform adjustments calibrate 2 BENCH BRIEFS and troubleshoot the HP 5371A to component level The service kit in cludes the following m Extender boards and cables HP IB operational verification disks both 5 inch and 3 inch for Series 200 300 controllers m Service training video tape m Operating programming and ser vice manuals The se
36. rvice training video tape is de signed for both customers and HP technicians While seminars are very useful in training technicians to make repairs seminars are most useful for WWW HPARCHIVE COM products that are seen frequently The HP 5371A is not a frequent visitor to a bench technician therefore this 23 minute video tape is a more effective way of providing service training continued on page 3 1ST QUARTER 1990 continued from page 2 The tape describes What the instrument does How to operate the instrument How the instrument works 5 m a m What diagnostics are available m How to use the diagnostics m How to locate the faulty assembly m How to use the service manual to repair the faulty assembly The tape is 23 minutes and 30 seconds in length and is available on VHS cas settes for both NTSC and PAL stan dards The NTSC VHS tape is avail able as HP P N 05371 13304 The PAL VHS tape is available as HP P N 05371 13305 To service the HP 5371A you must have the HP 5371A Service Kit HP P N 05371 67001 Both formats of the video tape are included with each ser vice kit Contact your local HP sales service of fice for ordering information tu S P Onsite On site Calibration Service Technical Data Recommended Reading New Instrument Support Literature Explains Hewlett Packard s On Site Instrument Service Programs Two new pieces of literature have just
37. se resistor with a fixed resistor 016 MR 4278A 02 Firmware changes correct HP IB system hang up 012 MR 4278A 03 Mod to trigger 4278A in Manual Trigger Mode when HP IB is set in Talker Mode 015 MR 4278A 04 Mod to correctly load measurement conditions from external memory card 015 MR 4278A 05 Modification to prevent drift during 1 kHz Capacitance Accuracy Test 015 MA 4284A 01 Instructions on installing Option 001 to the standard 4284A 013 MA 4284A 02 Instructions on installing Option 002 to the standard 4284A 013 MA 4284A 03 Instructions on installing Option 006 to the standard 4284A 013 MA 4284A 04 Instructions on installing Option 201 to the standard 4284A 013 MA 4284A 05 Instructions on installing Option 202 to the standard 4284A 013 MA 4284A 06A Instructions for retrofitting Option 301 to standard unit 015 MA 4284A 06 Instructions on installing Option 301 to the standard 4284A 013 MR 4284A 07 Modification to ease the extension of the A3 board for adjustments 015 MR 4284A 08 Mod to prevent HP IB lock up with either LRN or correction query commands 015 MR 4925B 01 Modification to prevent an intermittent power on display anomaly 010 IO 4934A 02 Instructions on installing battery operation Opt 001 to standard units 010 IO 4934A 03 Service manual correction to Step 2 of the Transmitter Flatness at 40dBm test 015 IO 4935A 03B Battery retrofit and upgrade 001 IO 4935A 14A Withdraw of part alert 1826 0735 001 IO 4936A 10 Preferred replacement diodes on
38. sed by head misposition 013 MR 4952A 11 Modification to reduce the current drain on the CIO chip A1U209 014 MR 4954A 05 Inspect and clean cable W7 to prevent display jitter 005 IO 4954A 06 List of disk control board replacements 014 MR 4954A 07 Modification required so the DLI board will run Phase II software 016 MR 4971A 01 New receiver board F1 fuses 002 MR 4971A 02 Co processor firmware change to correct frame misalignment 006 MR 4972A 01 New receiver board F1 fuses 002 IO 4972A 02 Disk control board repair identification 002 MR 4972A 03 Disk control board repair instructions 002 MR 4972A 04 Co processor firmware change to correct frame misalignment 006 MR _ 5328B 03 Modifications to 5328Bs with DVM Option 021 to correct unstable readings 013 IO 5334A 05 Explanation of X10 attenuator trigger level accuracy being nominal 009 IO 5334B 01 Explanation of X10 attenuator trigger level accuracy being nominal 009 IO 5334B 02 Setting trigger levels via HP IB requires DACS ON TR1 cmnd 013 IO 5334B 03 HP IB test tape mod prevents MATE IL or CI cmnds from generating error9 4 013 MA 5340A 14B Directions for converting to LED digital display 016 IO 5340A 23 Instructions on repairing the 5340A counter when A22U1 fails it cannot be replaced 007 IO 5342A 54 Washer must be retained to prevent display problem 003 IO 5342A 55 SWR specifications listed in the manual are typical specifications 013 IO 5342A 56 Retrofit option information 013 IO 5342A 57 Opti
39. to make unit meet 100K readings sec specifications 002 MR 44702A B 10 Modification to make unit pass OHMS measurement test 002 MR 44702A B 11 Modification to make unit pass performance test 002 MR 44702A B 12 Modification to make unit pass performance test 002 MR 44709A 01 Modifications to correct readings due to improper FET switching 014 MR 44710A 02 Modifications to correct readings due to improper FET switching 014 MR 44719A 01 Modifications to correct readings due to improper FET switching 014 MR 44720A 01 Modifications to correct readings due to improper FET switching 014 MR 54100A D 12A New ROMs eliminate loop failures at power up amp incorporate new firmware 005 MR 54111D 10 Modification to prevent attenuators from sticking 012 IO 54111D 11 Mod to prevent loss of trace with timebase set at 100 199 ns div inclusive 015 MR 54112D 04 F W mod to correct PLOT function error when STOP SINGLE button is pushed 013 IO 54112D 06 Loop 42 failure message may be caused by a Loop 50 failure 006 IO 54120A 01 Explanation of No Display condition system error after changing CPU or I O board 009 MA 54121A 01 Modification to upgrade trigger frequency from 500 MHz to 2 5 GHz 009 IO 54200A D 07 Change prevents false failure of PV test 9 18 Minimum Input Test 016 IO 54201A D 13A Component level repair is recommended when experiencing trigger problems 014 IO 54201A D 13 Component level repair is recommended when experiencing trigger problems 013 IO 54201A D 14 Cha
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