Text preview for : HP-Bench-Briefs-1988-04-06.pdf part of HP HP-Bench-Briefs-1988-04-06 HP Publikacje HP-Bench-Briefs-1988-04-06.pdf
Back to : HP-Bench-Briefs-1988-04-0 | Home
HEWLETT 1 i
PACKARD ' I 1
t
SERVICE INFORMATION FROM HEWLETT-PACKARD
2nd Quarter 1988
Joe Corege
Hew lett-Packard
Volt (vdlt) n. Abbr. V 1. The Inter-
national System unit of electric
potential and electromotive force,
equal to the difference of electric
potential between two points on a
conducting wire carrying a constant
current of one ampere when the
power dissipated between the points
is one watt. 2. A unit of electric
potential and electromotive force
equal to 1.00034 times the Interna-
tional System unit. In this sense, also
called the "international volt." [After
Count VOLTA.]
Are you aware? The standard volt
and the ohm will be correcting to a standard volt values. Hewlett-Pack-
new legal value on 1 January 1990. ard is considering the impact this
change will have in some applications
There have been a few changes since of current and future HP products,
the Treaty of the Meter was signed both hardware and software. Albuquerque, New Mexico. The arti-
on 20 May 1875, (see Figure 1). cle is from the April/May 1988 issue
The remainder of this article is re- of the Instrpmentation and Measure-
The change in the Josephson Junction printed with permission from the ment Society newsletter and gives a
frequency-voltage ratio 2 e / h is author, Dr. David W. Braudaway of history of changes since the- unit
smaller in most countries compared Sandia National Laboratories in began in 1884.
to the SI value set in 1972. Although
the absolute value has not yet been
determined, Figure 2 shows the ex-
pected value each country must ad- President's Golurnn
just. This table is from the "Report
on the 17th Session of the Consulta- David W. Braudaway A brief review of the history of these
tive Committee on Electricity" writ- Sandia National Laboratories values brings the perspective that
ten in the Journal of Research of the A 1buq uerque, New Mexico this is not the first adjustment and
National Bureau of Standards. that, as knowledge improves in the
Comments and concerns continue to future, we should expect the need to
In the U S . the volt is expected to be voiced on the change of the volt adjust again.
change by approximately - 9 ppm, and ohm scheduled for 1 January
France by -6.5 pmm and all other 1990. There is question as to why an A relatively large change in the
countries - 7.8 ppm. This means add- adjustment of the numbers by which electrical unit values was made in
ing these values t o your present we know the volt and ohm is needed. 1948. Also changed at that time was
Pub. NO. 5952-0132 @ Hewlett-Packard 1988
the way the units were defined. Prior comparison t o the reactance of a 1 international volt 1.000330 abs.
=
to 1948, each unit was, a t least calculable inductor or capacitor. In volt, and
officially, defined by an artifact; the turn, the values of inductance and 1international farad = 0.999505 abs.
system was the International Set of capacitance were derived from length, farad.
Units, begun in 1884 and modified in mass, and time through the velocity
1893, 1908, and 1910. The ohm was of light, length, and the defined In January 1969, another change was
defined by a 106.300 cm column of permeability of free space. made, but this time only in the value
mercury with a cross section of 1 of the volt. The official change was
mm2 at P C , the volt was provided As might be imagined, the ability to 11 parts per million (ppm), but in
by the standard cell, and the ampere measure had improved over the many the USA the change was 8.4 ppm.
was defined by the silver voltameter. years the international units were in This corrected the difference that had
There is a question of how often the existence. Improvements in funda- developed in the value maintained
ohm and ampere were actually real- mental measurements in the 1920s by the USA; other nations made
ized, but because all three units were and 1930s made evident the need for changes of different magnitudes to
defined, ohm's law could and did have a change in the unit values. This correct their values. 1972 saw a
a constant of proportionality! The change was delayed by the deterio- change in volt definition to that es-
change of definition in 1948 was rating international climate, but was tablished by the ac Josephson effect.
away from the individual artifacts accomplished in 1948 along with the In June of that year, the USA set the
and to a system where all the units change to abs. units. The electrical 2elh r a t i o a t 483.593420 GHzl
were defined or derived from a basic units were subject to a large change v(NBS), which represented the volt
set; specifically, length, mass, and in value; for example: value at NBS at that time. Interna-
time. The new units were called the tionally the value selected by the
absolute units or abs. for short. The 1international ohm = 1.000495 abs. Consultative Committee on Electri-
value of the ohm was established by ohm cally was corrected for change in the
Figure 1. Schematic depiction of how basic measurement units and standards are coordinated internationally. (Treaty of the Meter: La
Convention du Metre; CGPM: Conference General des Poids et Mesures or General Conference of Weights and Measures; CIPM: Comite
lnternational des Poids et Mesures or lnternational Committee of Weights and Measures; BIPM: Bureau lnternational des Poids et Mesures or
lnternational Bureau of Weights and Measures.)
2 BENCH BRIEFS 2ND QUARTER
Temperature and some other units
have also played roles in the main-
tained values of the electrical units,
but the effects have been generally
quite small. Temperature and mass
(USA only) will be subject to small
changes in 1990 in addition to the
changes of the ohm and the volt.
Problems encountered because of the
1990 changes seem to lie mostly in
the understanding of it. The change
is in the scaling factors by which we
know the units. For example, a proc-
ess that depends on a particular
voltage will work the same after the
change but the number by which we
know the voltage will be a little
different before and after. Measure-
ment of that voltage by an instrument
calibrated before the change will give
a number that differs by the magni-
tude of the change from the number
obtained by the same instrument
calibrated afterwards. Most meas-
Figure 2. Graphical comparison of the representation of the S volt of various countries based
I urements are not at the 10 ppm level
on the Josephson effect, VLA,, and of VLABwith the SI volt, V. The value of VLABindicated by and will not see the change. However,
`All Other Countries' is based on the value of the Josephson frequency-voltage ratio we are now in the curious position
(2e/h)CCE-72= 48 594.0 GHzlV.
A that the resolution of our very fine
measuring instruments equals or ex-
volt since 1969 and 483.5940 GHzIv the orange-red line of krypton 86. ceeds the uncertainty by which we
was selected. One must be careful to This change put the length value in can determine the magnitude of
use the proper constant when com- terms of a fundamental physical con- the values.
paring voltage sources established by stant that was not subject to damage,
different nations. The 1990 change but removed the comfortable feeling The history of the effort that has
will remove this problem; all will offered by an artifact that could ac- gone into establishing and maintain-
start out with the same value. tually be touched. Based on proposals ing the units is a most fascinating
made in 1975 and realized later, the one. Additional information may be
Changes in the definition and reali- definition of length was changed in obtained, from a variety of publica-
zation of length have also had an 1983 to be in terms of the velocity of tions, especially those of the National
effect on the electrical units. In 1889 light using a methane or iodine sta- Bureau of Standards. An example is
(modified in 1927) the meter was blised helium-neon or argon laser N B S Circular 475 by F. B. Silsbee on
defined by an artifact bar of platinum (several combinations are possible). the electrical units, 1949. Among the
w i t h 10 percent i r i d i u m . This This change offered the possibility of authors are a number who have been
definition was still in effect at the more than an order of magnitude active in the Instrumentation and
time of the 1948 change. To some improvement in the length value and Measurement Society; e.g., Dr. C. H.
people, the idea of an artifact-some- fixed the value of the velocity of light. Page, and Dr. F. C. Harris. A short
thing solid-as a base for the electri- Thus, length became a derived unit; and concise history of the early times
cal units gave comfort. In 1960, the ohm is now based on the velocity is given in Chapter 1ofBasic Electri-
however, the definition of length of light. cal Measurements by Melville B.
changed to wavelengths of lights of Stout, Prentice Hall, 1950. 0
2NDQUARTER BENCH BRIEFS 3
HP 3065H/HX Board power could result in a possible shock
Safety- ReI ated hazard.
Test Systems
Service Notes Hewlett-Packard has developed a
This Product Safety Service Note
Service notes from HP relating to applies to HP 3060A, 3061A, 3062A hardware modification for this prob-
personal safety and possible equip- 3065H and 3065HX Board Test lem. Please contact your nearest HP
ment damage are of vital importance Systems equipped with t h e office, or order Product Safety Service
to our customers. To make you more H P 11253A/B Power Distribution Note 3065-58-S through Bench Briefs
aware of these important notes, they Units. A safety problem exists in for more information.
are printed on paper with a red HP 3065H/HX systems with serials
border, and the service note number 2543A00258 a n d below, except HP 8562A Spectrum Analyzer
has a "-S'suffix. In order to make 2543A00245, 2543A00246, a n d
you immediately aware of any poten- 2543A00257. The problem involves A potential shock hazard may exist
tial safety problems, we are high- intended or accidental application of if the power line ground connection
lighting safety-related service notes UNSWITCHED ac power from 521 to a protective earth terminal is
here with a brief description of each or 522 of the HP 11253A/B Power defeated. Please order Product Safety
problem. Also, in order to draw your Distribution Unit to a test fixture. If Service Note 8562A-1-S for modifi-
attention to safety-related service the cable intended for 52 (ac DUT cation instructions. Safety mod-
notes on the service note order form power cable) is incorrectly connected ification kit P/N 08562-60053 will be
at the back of Bench Briefs, each to either 521 or 522, unswitched ac provided free of charge. 0
appropriate number is highlighted power will be connected to the test
by being printed in color. fixture. Contact with unswitched ac
time charge. There is also a microfiche 3065-57. All HP 3065CXICL Systems being updated
subscription service available that to Rev. 3.0. Instructions for installing MUX card
ROMS during the HP 3065CXICL Rev. 3.0 Software
automatically updates the library on Update Procedure.
3065-58-S. Serial numbers: HP 3065HXs 2543A00258
a quarterly schedule. and below, except 2543A00245, 2543A00246, and
2543A00257. Warning-possible shock hazard. If
the cable intended for J2 (AC DUT Power Cable) is
The part numbers for the service incorrectly connected to either J21 or J22, unswitched
note microfiche library and subscrip- AC power will be connected to the test fixture.
tion service are: 3065-60. All serials. Modifications to the 5, 15, 24 volt
Need Any Service power supplies to improve performance.
Library- 5951-6511 HP 3455A DIGITAL VOLTMETER
Notes? Subscription service- 5951-6517 3455A-188. Serials 1622A09090 and below. Recom-
mended replacements of A10 FETs Q1, Q2, Q3,
Q4, Q13, Q14, Q15, Q16, Q18, 0 1 9 , (221,
They're free! Contact your local HP Sales Office Q38, (239.
for ordering information. 0 VOLTMETER
HP 3 4 5 6 ~ I ~ I T A L
D
Here's the latest listing of service 3456A-13A. Serials 2201 A05331 and below. ModifF-
notes. They recommend modifications HP 438A POWER METER cation to improve digital circuitry.
3456A-14A. Serials 2201A06299 and below. Modifi-
to Hewlett-Packard instruments t o 438A-4A. Serial prefix 2743A and below. Recommended
cation to enhance analog circuitry.
A3 microprocessor board replacement (PIN 00438- 3456A-158. Serials 2201A04796 and below. Modifi-
increase reliability, improve perform- 60105). cation to enhance main controller board (A4).
ance, or extend their usefulness. HP 1650A11651A LOGIC ANALYZER
1650/1651A-4.1650Aserials: 2801A01544 and below. HP 3488A SWITCH/CONTROL UNIT
3488A-12. Extended hardware support (1 June 1990)
Use the form at the rear of Bench 1651A serials: 2801A00643 and below. New key-
for power supply failures.
board housing to improve cosmetics and static
Briefs to order, free of charge, service discharge.
HP 3709A CONSTELLATION DISPLAY
notes for several instruments. 3709A-7. All serials. Keyboard link position information
HP 3065 BOARD TEST SYSTEM
3065-20A. All serials. Repair of the external vacuum for retrofit kits.
If you would like to purchase large module P/N 03065-80602.
HP 3764A DIGITAL TRANSMISSION
3065-52. All serials. Solutions for hybrid card relay
quantities of service notes covering failures. ANALYZER
a wide range of instruments, or if 3065-53. Serial numbers. All CX and CL Controller 3764A-23. All serials. Data inputs adjustment procedure.
serial numbers presently under Software and Material
you desire a complete history of all Support Contracts, and presently running Software HP 3780A PATTERN GENERATOR
service notes documenting all changes revisions CXICL 1.1 or CXICL 2.0. Installation of AND ERROR DETECTOR
Software Revision 3.0. 3780A-34. Serials 2725U03943 and below. Preferred
to your instruments, Hewlett-Packard 3065-54. All serials. Pulser power supply capacitor replacement of A35 assembly on options 100, 101,
offers a microfiche library for a one failures. 103 and 104.
4 BENCH BRIEFS 2ND QUARTER
HP 4063A SEMICONDUCTOR PARAMETER HP 8562A SPECTRUM ANALYZER HP 8780A VECTOR SIGNAL GENERATOR
ANALYSIS SYSTEM 8562A-1-S. Serials: 8780A-01. All serials. Firmware history and update kit.
4063A-4. All serials. Repair procedure for switching 2703A00223 2703A00295 8780A-02. Serial prefixes 2725A and below. Reduced
matrix. 2703A00224 2703A00296 carrier frequency offset for DCFM (except option
2703A00238 2703A00299 064).
HP 4145A/B SEMICONDUCTOR 2703A00252 2703A00300 8780A-03. All serials. Retrofitting option 002 (high
PARAMETER ANALYZER 2703A00263 2703A00308 power coherent carrier).
4145A-12/41458-3. All serials. New SMU board in- 2703A00290 2703A00310
stallation procedure. 2703A00294 2703A00329 HP 103088 6809/6809E
INTERFACE MODULE
HP 5340A MICROWAVE Possible shock hazard. The chassis of some HP Model 103088-2. Incorrect clock specification. Modification
FREQUENCYCOUNTER 8562A's could float at +175 Vdc relative to power to correct the clocking scheme so the interface
5340A-138. Serial prefixes 1928A and below. New line neutral if the protective earth ground is defeated. functions properly when used with the HP1650A,
A17 direct count amplifier to improve performance. HP1651A, or HP16510A logic analyzers.
HP 8590A SPECTRUM ANALYZER
HP 5345A ELECTRONIC COUNTER 8590A-8. Serials 2736A002155 and below, and HP 16500A LOGIC ANALYSIS
5345A-40. Serial prefixes below 2648A. Solution to 2735U000616 and below. Modification to prevent 3 SYSTEM MAINFRAME
low frequency miscount problem. MHz RBW distortion. 16500A-1. Serials 2650A00345 and below. Incorrect
8590A-10. Serials 2753A02568 and below. Modifying fans installed in instruments.
HP 5507A LASER POSITION the RS-232 I/O assembly A21 to operate with a 16500A-2. Serials 2650A00425 and below. Cardcage
TRANSDUCER ELECTRONICS standard HP 13242G RS-232 cable. modification to support current power supply revision.
5507A-2. Serials 2816A00370 and below. Revised A1 16500A-3. Serials 2650A00550 and below. Place in-
H P - I B interface b o a r d t o improve HP-18 HP 8592A SPECTRUM ANALYZER sulating tape on power supply screws to eliminate
performance. 8592A-2. Serials 2805A00479 and below. Modifying power recycling.
the RS-232 I/O assembly A21 to operate with a
HP 8175A DIGITAL SIGNAL GENERATOR standard HP 13242G RS-232 cable. HP 372128 MODEM
8175A-2. Serials 2642G00715 and below. Modification 372128-01, Some units prior to 2740U00450. Modifi-
to increase the reliability of the A/B amplitude HP 8673C/D SYNTHESIZED cation to correct contents of internal registers when
Vernier control circuit. SIGNAL GENERATOR stuck at default values.
8673C-16. Serial prefixes 2447A and below. Improved
HP 8443A TRACKING reliability for automatic level control 0.05 to 2 GHz. HP 44701A INTEGRATING VOLTMETER
8673D-17. Serial prefixes 2447A and below. Improved FOR THE HP 3852A
GENERATOWCOUNTER reliability for automatic level control 0.05 to 2 GHz.
8443A-11. All serials. Modification of the crowbar 44701A-5. All serials. ACV operation verification and
overvoltage protection circuit triggering when performance test "failures:'
HP 8683B/D SIGNAL GENERATOR
switching from standby to on.
86838-02. All serials. Oscillator assembly (A14) post HP 541i 1 D DIGITIZING OSCILLOSCOPE
repair adjustment procedure. 54111D-4. Serial prefixes 2733A and below. New
HP 8447A 0.1 TO 8683D-02. All serials. Oscillator assembly (A14) post
400 MHz PREAMPLIFIER improved A1 timebase board (HP P/N 54111-
repair adjustment procedure. 66513) requires firmware revision of March 10,
8447A-1A. Serial prefix 2809A and below. Recom-
mended 400 MHz preamplifier replacement. 1988 or later.
HP 8684B/D SIGNAL GENERATOR 54111D-5. Serial prefixes 2733A and below. Replacing
86848-05. All serials. Oscillator assembly (A14) post ADC board (HP PIN 54111-69501) may require
HP 8447A DUAL PREAMPLIFIER repair adjustment procedure. firmware revision of March 10, 1988 or later.
8447A-2A. Serial prefix 2809A and below. Recom- 8684D-03. All serials. Oscillator assembly (A14) post 54111D-6. Serial prefixes 2733A and below. New A2
mended 400 MHz preamplifier replacements. repair adjustment procedure. microprocessor assembly HP 541 11-66517 replaces
HP P/N 54111-66507 due to firmware update.
HP 855749 SPECTRUM ANALYZER HP 8720A NETWORK ANALYZER
8557A-16. Serial prefix 2507A through 2728A. Modifi- 8720A-1. All serials. Adjustments to optimize spurious HP 70900A LOCAL OSCILLATOR
cation to improve residual FM performance in swept responses and reduce FM sidebands on the source 70900A-16. HP-MSIB change on the MEM+ controller
mode. signal. board assembly to improve performance.
8 Application Note Index is ow Available
L*
B l Dunaway
il To direct customers to appropriate Programming Notes that describe
Corporate Marketing Services abstracts, which briefly describe in- instrument control in systems en-
dividual HP publications, the index vironments; may be either intro-
The 1988 is categorized by industry, subject, ductory operating guides or quick
Application and HP model number. reference guides.
Note Index is
now a v a i l - Publications include: Customers may obtain copies of the
able. The in- index (P/N 5954-0203) from the Cus-
dex is a list- Application Notes that explain the tomer Information Center in the U.S.
ing of over use of products or families of prod- or from local sales offices. The index
600 free HP ucts in specific applications. primarily serves the test and meas-
publications urement audience. However, some
Product Notes t h a t describe
designed t o publications are listed that address
product-specific measurement
help cus- technical computing topics and
tomers select and use HP electronic techniques.
fundamentals. 0
instruments, solid-state components, Application Bulletins and Briefs
and systems as part of measurement that cover the use of component
and design solutions. products.
2ND QUARTER BENCH BRIEFS 5
service Note or For
If you want service notes, please For European customers (ONLY) Name
check the appropriate boxes -below
and return this form separately to Hewlett-Packard Firm
one of the following addresses. Nederland BV Address
Central Mailing Dept.
Hewlett-Packard P.O.Box 529 City
1820 Embarcadero Road 1180 AM Amstelveen
Palo Alto, California 94303 The Netherlands State Zip
0 438A-04A 0 3456A-13A 0 5345A-40 0 8592A-02 0 8780A-03
0 165011651A-04 0 3456A-14A 0 5507A-02 0 8673C-16 0 103088-02
0 3065-20A 0 3456A-15B 0 8175A-02 0 86730-17 0 165OOA-01
0 3065-52 0 3488A-12 0 8443A-11 0 8683B-02 0 165OOA-02
0 3065-53 0 3709A-07 0 8447A-01A 0 8683D-02 0 165OOA-03
0 3065-54 0 3764A-23 0 8447A-02A 0 86848-05 0 372128-01
0 3065-57 0 3780A-34 0 8557A-16 a684~-03 0 44701A-05
0 3065-58-S 0 4063A-04 0 0562A-01-S 0 8720A-01 0 54111D-04
0 3065-60 0 4145A-1214145B-03 0 8590A-08 0 878OA-01 0 54111D-05
0 3455A-188 0 5340A-13B 0 8590A-10 0 8780A-02 0 54111D-06
0 70900A-16
Please photocopy this order form 11 you do not
want lo cut 011 the page
Bulk Rate
U S Postage
BENL'H BHltrFS
D QUARTER 19
Volume 28 Number 2
informa
Packard
in a qualification form f B ~ C H T a l C . JA
iiihrrrintinn annd vnn
w x vim
6 BENCH BRIEFS 2ND QUARTER