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HEWLETT
PACKARD
SERVICE INFORMATION FROM HEWLETT-PACKARD
1st Quarter 1997
istory of Frequency Traceability
at HP-Sanaa Clara
Bob PifcocklHewIett-Packard year. The "flying clock's'' time would the flying clock trips. They would co-
be checked at USNO in Washington DC ordinate the timing of DoD installa-
prior to, and after, the trip to obtain clo- tions using GPS time as a reference. A
Introduction sure for all the measurements taken single channel GPS receiver was ac-
during the trip. Areport would be sent quired by SCD to use as a timing refer-
Traceability to the National Institute of out, approximately one month after the ence. Since the original block of GPS
Standards and Technology (NET) or trip, indicating time errors. That report satellites did not have SA (selective
the United States Naval Observatory would be used with previous reports availability) installed, it was quite easy
(USNO) for time and frequency mea- to estimate the long term frequency to achieve very good results. SA is the
surements has been a concern for some error of the Santa Clara Division Time process of dithering the signals of com-
customers of Hewlett-Packard for and Frequency Standard. mercial applications for security pur-
many years. Even though our cesium poses. With SA, positioning can only
(c beam frequency standards are recog-
nized as primary frequency standards,
DAS
After the development and widespread
be guaranteed to 100 meters or so. A
USNO Data Acquisition System (DAS)
some customers still request traceabil- usage of Global Positioning Satellite was then installed at SCD and used as
ity. Without physically traveling with System (GPS) timing receivers, it be- the primary reference for time and fre-
an operating frequency standard, the came unnecessary for USNO to make quency until recently. The DAS con-
only way to achieve traceability is
through some type of satellite transfer.
This is fine, and is accepted by most
customers, but there were still a few
that wanted to see a "paper trail."
History
Flying Clock
In the early days of Department of De-
fense (DoD) coordinated precision time
keeping, the standards lab at HP-Santa
Clara was an official DoD time keep-
ing station. This was partly due to the
fact that the cesium beam frequency
standards were (and still are)manufac-
tured at Santa Clara. Representatives
of the Time Services Department of
USNO would make several "flying
clock" trips to coordinate time at the
DoD stations in the Pacific region. The
flying clocks consisted of an HP 5061A
Cesium Beam Frequency standard and
' f a very heavy battery supply that could
be recharged in a car or in an airplane. /
It took two people to handle and trans-
port the clock. They would make stops
at Santa Clara three to four times each
i
HP 5071A Primary Frequency Standard.
Pub. NO. 5964-6005E 0 Hewlett-Packard1997
WWW.HPARCHIVE.COM
-
sisted of the previously mentioned GPS
receiver, LORAN C receiver, computer,
time interval counter, modem, and a
switching system. The 1pps output of
the SCD reference clock was used as the
time interval start pulse for all readings.
To make a long story short, the SCD-
GPS reading was used by USNO to
determine SCD's time error. An auto-
matic e-mail message was sent from
USNO to SCD each day with time er-
ror information. The information on
those messages was used to determine
long term frequency accuracy. After all
the original satellites became unusable
and SA was here to stay, the readings
were quite unstable. An HP 58503A
GPS Time and Frequency Reference
Receiver was put into the system and
the GPS readings improved dramati-
cally. There was still one problem.
There was still a "paper trail" traceabil-
ity issue.
FMAS
The NIST Frequency Measurement and HP 58503A GPS Time and Frequency Reference Receiver.
Analysis System (FMAS)is our current
method of maintaining frequency
traceability to NIST. The Accuracy of period our frequency measurement quency standards and clocks for
uncertainty is better than 1 part in 10
the FMAS is based on the Global Posi-
tioning Satellite System. GPS was origi- to the -13. The reason for the long term
more than 30 years. They have been
manufactured at HP-Santa Clara for 7
nally intended for very precise naviga- measurement is to average out the ef- more than 25 years. It is therefore ab-
tion. Each satellite in the system con- fect of SA. The traceability issue is re- solutely necessary for the Santa
tains at least one cesium standard, so solved with FMAS because NIST issues Clara Division Standards Lab to
time can be controlled and monitored a certificate each month indicating maintain a very accurate frequency
very accurately. The timing of the daily frequency uncertainties. standard system. Reference frequen-
clocks in the satellites is controlled by cies of 1,5, and 10 MHz are distrib-
Frequency Calibrations
the United States Naval Observatory. uted throughout the division via a
With the FMAS system it is possible to complex distribution system. Fre-
In a perfect system, navigation can be calibrate four oscillators at one time.
accomplished with a n accuracy of quency uncertainty is maintained at
The measurements are made against 1X 10 to the 13. This has been veri-
inches. Timing would be accurate to a our primary standard. Since the system
few nanoseconds. Because of national fied using the HP 58503A GPS re-
has already given us an uncertainty for ceiver and the NIST FMAS system.
security demands, selective availabil- our primary standard, we can use that
ity (SA) was installed for commercial Readings are averaged for 30 days
uncertainty as our own measurement to eliminate effects of GPS noise
GPS users. With SA, the GPS signals are uncertainty for the other calibrations.
dithered, so that the guaranteed accu- caused by SA. Using the FMAS sys-
racy for navigation is approximately HP GPS (58503A) tem, we can calibrate u p to four os-
100 meters, and timing accuracy is 300 cillators simultaneously. We wel-
The 58503A has outputs of 1 pps and
nanoseconds. come customer owned equipment,
10 MHz. The specifications of both out-
such as cesium standards and GPS
The FMAS system consists of an IntelTM puts are identical. It incorporates a
receivers. We provide 10 MHz out-
486 PC, GPS receiver, time interval combination of enhanced GPS and
put data for HP GPS receivers in !
counter with 40 picosecond resolution, Smart Clock technology. With en-
both locked and holdover modes.
and a modem. The signal from the GPS hanced GPS, proper antenna installa-
For more information please call:
receiver is compared to our primary tion, and the receiver locked and oper-
frequency standard. Over a period of ating properly, the maximum timing
time, 30 days for us, we can obtain very error is 110 nanoseconds. Frequency Bob Pitcock
accurate frequency uncertainties. In accuracy is 1part in 10 to the -12 for a Santa Clara Division Standards
order to improve our uncertainty, we 24 hour average. Lab, MS78
Hewlett-Packard Co.
3
have replaced the NIST GPS receiver Conclusion
with our HP 58503A. The performance 5301 Stevens Creek Blvd.
of the system is at least ten times better Hewlett-Packard has been the world's Santa Clara, CA 95052
now than it was before. Over a 30 day leader in commercial primary fre- (408) 553-2380 0
2 BENCH BRIEFS 1ST QUARTER 1997
WWW.HPARCHIVE.COM
-- -I-__^
- -
- I
Ti mebase Test/Adj ustment Procedure
Formula 1. To calculate "allowable offset" for specific timebases, use the following formula.
Allowable Offset = [(Aging Spec) (Cal Intervallrl)] + [Temp Spec]
Where,
`Aging Spec' is expressed as a unitless fraction per unit of time ([.e., 5E-lO/day).
`Cat Interval' is expressed in the same unit of time as the `Aging Spec' above. (i.e., If
`Aging Spec' is a fraction per day, then `Cat Interval' is expressed in days.)
`Temp Spec` is the frequency stability specification over a range of temperatures. It's
typically listed in the specification/data sheet, and IS expressed in unitless, fractional
frequency (i.e., 7E-9).
In a previous issue of Bench Briefs we Example:
defined the "Calibration of Time Base
Given,
Oscillators. In that issue a long and de-
tailed process was provided. The fol- Aging Spec=SE-lOfday
lowing is a redefinition of that process,
Cal Interval=l year=365 days
simplified for future reference.
The purpose of this procedure is to Temp Spec=7E-9
check/adjust timebase frequency off- A.O.=[(5E-lO/day) * (365 days/4)] + [7E-9] = 5.3E-
set. However, before meaningful offset
measurements m a y be taken, the
timebase must be warmed up.
Formula 1 (for more specific guid- Table 1. How to Determine When to
Procedure ance) to determine if adjustment is Adjust Offset. (For typical timebases,
necessary. assume one year calibration interval.)
1. Allow enough time for the oscilla- Note: As a minimum, timebases should Timebase
tor to warm up as evidenced by it be adjusted if "allowable offset" limits Type Offset
meeting or approaching its aging
specification. At least 24 hours, but
are exceeded. For some cases, a xo 6E-6
customer's specific application/re- TCXO 1 E-6
not more than three days. quirement may supersede this "mini- Medium Perf.
2. If stability cannot be realized in three mum requirement." For example, you OvenXO 1E-7
days there may be a problem that may require your HP 1058 Oscillator
needs to be corrected. be reset to 5E-9 or better. High Perf.
OvenXO 5E-8
3. If necessary, remove any offset by Special Note: Timebase offset is not
adjusting the frequency back to normally a warranted specification. tolerance status. Use the limits soley as
nominal (usually 10 MHz). Use ei- Therefore do not use these "allowable a guide to determine when to readjust
ther Table 1 (as a general guide) or offset" limits to determine any out-of- timebases. 0
IS0 Visit a Hewlett- Safety-Related
Guide 25 Packard Metrology Service Notes
Draft 5 WEB Page Service Notes from Hewlett-Packard
relating to personal safety and possible
IS0 Guide 25 Draft 5 is now available Hewlett-Packard's support center in equipment damage are of vital impor-
for review. It was released in late Janu- the United Kingdom has developed tance to our customers. To make you
ary 1997. For a copy contact: special interest web pages catering for more aware of these important notes,
all things metrological. they are printed on paper with a red
ANSI border, and the service note number
1 West 42nd Street
1 Visit the Metrology Forum at:
has an "-S" suffix. In order to make you
New Youk, NY 10036 http: / /www-uktm.external.hp.com/ immediately aware of any potential
212-642-4900 0 -mikehut / f orum2.html 0 safety problems, we are re-highlighting
1ST QUARTER 1997 WWW.HPARCHIVE.COM BENCH BRIEFS 3
safety-related service notes here with tomer to earth/ground the instrument J2523B- US35310000/
a brief description of each problem. via the power cord. US35319999 EC: Label #9 fl
Also, in order to draw your attention
to safety-related service notes in the Hewlett-Packard strongly recommends Situation:
service note index, each safety-related that you return the instrument imme-
diately to the nearest HP Customer One of the chassis screws that secure
service note is highlighted with a con- the power supply to the bottom of the
trasting color. Repair Center for inspection, and if re-
quired, repair at no charge. For more chassis may be excessive in length to
85942A Video Signal Monitor information, you may order a safety the point it may compromise the insu-
service note document from HP First. lation on a primary circuit capacitor. If
Serial Numbers Affected: the screw compromises the capacitor's
For 85942A-02-S order document id
OOOOUOOOOO/ 3607U00187 6732. If you do not have access to a FAX insulation, primary voltage may be
machine, order this service note from present on the chassis.
Situation: your nearest HP Office.
These instruments have a line module Hewlett-Packard strongly recommends
assembly (85942-61002) that includes 3 J2301B/J2302B/J2522B/J2523B that you return the instrument imme-
wires connected to the power supply Internet Advisors diately to the nearest HP Customer Re-
assembly. The power supply connec- pair Center for inspection, and if re-
tion is made using crimps on each wire. Serial Numbers Affected: quired, repair at no charge. For more
On some line module assemblies these J2301B-US35340000/ information, you may order a safety
wires have been inadequately attached US35359999 EC: Label #9 service note document from HP First.
to the crimp and can become easily dis- J2302B- US35340000/ For document id numbers refer to the
connected. This could result in the in- US35359999 EC: Label #9 list of service notes at the end of Bench
strument chassis going live under a Briefs. If you do not have access to a
double fault condition-failure of the J2522B- US35310000/ FAX machine, order this service note
crimp contact and failure of the cus- US35319999 EC: Label #9 from your nearest HI' Office. 0
1997 Bench Briefs' Instrument '"3
Service Note Index
HP FIRST (208)344-4809
T & M Instrument Section - Press 4
T & M Service Notes - Press 2
Enter the Password - 76683
SN SN Abstract HP FIRST
Type No. Document I No.
D
IO 11757B-04 Selftest No. 3 (Failure ?) is no failure at all 651 1
IO 11758B-04 Selftest No. 3 (Failure ?) is no failure at all 6512
IO 16192A-02 Repair information on old designed parts 6513
IO 16193A-01 Repair information on old designed parts 65 14
MR 165OOC-02 Recommended fan guard replacement 6515
IO 3245A-05 Power supply requirementsfor the voltage compliance performance test 6516
MR 33 120A-02 Mod corrects RS-232 communication error 6517
IO 3437A-10 Fan replacement kit available for defective cooling fan 6518
MR 34401A-07 Mod corrects RS-232 communication error 6519
MR 34401A-09 Mod to eliminate infrequent erroneous "overload" indication 6520
4 BENCH BRIEFS WWW.HPARCHIVE.COM 1ST QUARTER 1997
SN SN Abstract HP FIRST
Type No. Document ID No.
MR 34420A-01 Mod corrects RS-232 communication error 652 1
IO 3455A-30 Fan replacement kit available for defective cooling fan 6522
MR 3458A- 12 Modification corrects period measurement error 6523
IO 3562A-15 Discharged battery causes power up problems 6524
IO 3563A-04 Discharged battery causes power up problems 6525
MR 35656B-02 Process for repairing coldno solderjoints 6526
IO 3770 1A-09 Display flicker not a fault when in graph storage mode 6527
IO 37702A-03 Display flicker not a fault when in graph storage mode 6528
IO 31704A-03 Display flicker not a fault when in graph storage mode 6529
IO 37717A-07 Display flicker not a fault when in graph storage mode 6530
IO 377178-04 Display flicker not a fault when in graph storage mode 653 1
IO 3772 1A-1 3 Display flicker not a fault when in graph storage mode 6532
IO 37722A-03 Display flicker not a fault when in graph storage mode 6533
IO 37724A-06 Recommended replacement 3-pin Siemens Spacer 6534
IO 37724A-07 Display flicker not a fault when in graph storage mode 6535
IO 37724A-08 Firmware upgrade 6536
IO 37732A-06 Display flicker not a fault when in graph storage mode 6537
IO 37732A-07 Retrofit instructions for the datacom lid 6538
IO 37776A-01 Recommended replacement modules 6539
IO 37776A-02 Exchange module and connector information 6540
IO 3784A-MA Instructionsto retrofit Opt 002 to a standard instrument 5693
MR 4062F-02 Design change of cabinet front door 6541
MR 4062F-03 Modification to improve heat dissipation 6542
MR 4142B-13 ROM replacement to correct PT command default pulse width 6543
IO 4142B-14 Firmware revision and its ROM part numbers 6544
IO 41501A-02 Protective cover for the 41501A Expander's Interface Card 6545
MR 4155A-07 Replacing CPU board ROMs fix firmware defects 6546
MR 4156A-08 Replacing CPU board ROMs fix firmware defects 6547
MR 4194A-14A Mod prevents hang-up at power-on when instrument is cold 6176
MR 4 195A- 18A Mod prevents hang-up at power-on when instrument is cold 6177
MR 42638-0 1 Firmware upgrade corrects ADC error in DC biased measurement 6548
MR 4286A-03 Firmware upgrade corrects compensation ON/OFF problem 6549
MR 437B-08 Modification to eliminate loose reference oscillator N-type connectors 6550
MR 437B-09 Mod eliminates error 67 caused by defective resistors 6551
MR 438A-14 Modification to eliminate loose reference oscillator N-type connectors 6552
IO 4934A-13 Proper top cover recommendation 6553
IO 4934A-14 Notification of fuse location in neutral line 6554
IO 5065A-06 Recommended replacement of obsolete electrolyticfilter capacitor 6555
IO 5087A-01 Recommended replacement of obsolete electrolyticfilter capacitor 6556
MR 53131A-01 Unit powers up in the standby mode 6557
MR 53132A-0 1 Unit powers up in the standby mode 6558
MR 5318 1A-0 1 Unit powers up in the standby mode 6559
MR 5334A-07A AlU22 input Schmitt amplifier part change 6181
MR 5334B-08A AlU22 input Schmitt amplifier part change 6182
MA 5340A-25 HP-IB lockup problem with multiple readings 6560
IO 5342A-61 Revised Option 002 adjustmentprocedures 6561
If IO 54520A-03 How to fix lock up during an HPIB activity 6562
, 1ST QUARTER 1997 BENCH BRIEFS 5
i
I
WWW.HPARCHIVE.COM
c
SN SN Abstract HP FIRST
Type No. Document ID No.
'7
IO 54520A-04 How to prevent Logic Trigger Delay Calibration failure 6563
IO 5452OC-04 How to fix lock up during an HPIB activity 6564
IO 5452OC-05 How to prevent Logic Trigger Delay Calibration failure 6565
IO 54522A-03 How to fix lock up during an HPIB activity 6566
IO 54522C-04 How to fix lock up during an HPIB activity 6567
IO 54540A-03 How to fix lock up during an HPIB activity 6568
IO 54540A-04 How to prevent Logic Trigger Delay Calibration failure 6569
IO 5454OC-04 How to fix lock up during an HPIB activity 6570
IO 5454OC-05 How to prevent Logic Trigger Delay Calibration failure 6571
IO 54542A-03 How t fix lock up during an HPIB activity
o 6572
IO 54542C-04 How to fix lock up during an HPIB activity 6573
MR 54645A-01 Potential capacitor failure in 15.75V pwr supply on main board assy 6574
MR 54645D-01 Potential capacitor failure in 15.75V pwr supply on main board assy 6575
MR 546528-02 Potential short between PC board and module cover 6576
MR 546598-02 Potential short between PC board and module cover 6577
IO 58503A-0 1 Oscillator mounting bracket change requires mechanical re-work 6578
IO 59306A-09 Replacement of the 59306A Switch Board Assembly 6579
IO 595 5 1A-O1 Oscillator mounting bracket change requires mechanical re-work 6580
IO 6541A-01 Recommended replacement Keypad board, optical encoders and knobs 6581
IO 6542A-01 Recommended replacement Keypad board, optical encoders and knobs 6582
IO 6543A-01 Recommended replacement Keypad board, optical encoders and knobs 6583
IO 6544A-01 Recommended replacement Keypad board, optical encoders and knobs 6584
IO 6545A-02 Recommended replacement Keypad board, optical encoders and knobs 6585
IO 6551A-01 Recommended replacement Keypad board, optical encoders and knobs 6586
IO 6552A-01 Recommended replacement Keypad board, optical encoders and knobs 6587
IO 6553A-01 Recommended replacement Keypad board, optical encoders and knobs 6588
IO 6554A-01 Recommended replacement Keypad board, optical encoders and knobs 6589
IO 6555A-01 Recommended replacement Keypad board, optical encoders and knobs 6590
IO 657 I A-01 Recommended replacement Downprogamming FETs 6591
IO 657 1A-02 Recommended replacement Keypad board, optical encoders and knobs 6592
IO 6572A-01 Recommended replacement DownprogammingFETs 6593
IO 6572A-02 Recommended replacement Keypad board, optical encoders and knobs 6594
IO 6573A-02 Recommended replacement Keypad board, optical encoders and knobs 6595
IO 6574A-02 Recommended replacement Keypad board, optical encoders and knobs 6596
IO 6575A-03 Recommended replacement Keypad board, optical encoders and knobs 6597
IO 6621A- 10 Recommended replacement transistors for Q326,Q327,4329 6598
IO 6622A-08 Recommended replacement transistors for Q326,4327,4329 6599
IO 6623A- 12 Recommended replacement transistors for Q326,Q327,Q329 6600
IO 6625A-07 Recommended replacement transistors for 4326,4327,4329 6601
IO 6626A-07 Recommended replacement transistors for 4326, 4327,4329 6602
IO 6628A-07 Recommended replacement transistors for 4326,4327,4329 6603
IO 6629A-07 Recommended replacement transistors for 4326,4327,4329 6604
IO 664 1A-02 Recommended replacement Keypad board, optical encoders and knobs 6605
IO 6642A-02 Recommended replacement Keypad board, optical encoders and knobs 6606
IO 6643A-02 Recommended replacement Keypad board, optical encoders and knobs 6607
IO 6644A-02 Recommended replacement Keypad board, optical encoders and knobs 6608
IO 6645A-03 Recommended replacement Keypad board, optical encoders and knobs 6609
6 BENCH BRIEFS 1ST QUARTER 1997
WWW.HPARCHIVE.COM
SN SN Abstract HP FIRST
Type No. Document ID No.
IO 6651A-04 Recommended replacement Keypad board, optical encoders and knobs 6610
IO 6652A-04 Recommended replacement Keypad board, optical encoders and knobs 661 1
IO 6653A-04 Recommended replacement Keypad board, optical encoders and knobs 6612
IO 6654A-04 Recommended replacement Keypad board, optical encoders and knobs 6613
IO 6655A-04 Recommended replacement Keypad board, optical encoders and knobs 6614
IO 6671A-03 Recommended replacement Downprogamming FETs 6615
IO 6671A-04 Recommended replacement Keypad board, optical encoders and knobs 6616
IO 6672A-03 Recommended replacement Downprogamming FET Q90 1 6617
IO 6672A-04 Recommended replacement Keypad board, optical encoders and knobs 6618
IO 6673A-04 Recommended replacement Keypad board, optical encoders and knobs 6619
IO 6674A-04 Recommended replacement Keypad board, optical encoders and knobs 6620
IO 6675A-05 Recommended replacement Keypad board, optical encoders and knobs 662 1
IO 6680A-02 Recommended replacement Downprogamming FET Q90 1 6622
IO 6681A-02 Recommended replacement Downprogamming FET Q90 1 6623
MR 6812A-06 Mod to correct output voltage transient during output voltage level change 6624
MR 6813A-06 Mod to correct output voltage transient during output voltage level change 6625
MR 6813A-07 Mod prevents false tripping of peak current limit switch 6626
MR 6814A-02A Output voltage transient during output voltage level change 6627
MR 6814A-03 Modification to correct nuisance fuse opening 6628
MR 6814B-01 Modification corrects insufficient gate drive 6629
MR 6814B-02 Modification to correct nuisance fuse opening 6630
MR 6834A-03A Output voltage transient during output voltage level change 663 1
MR 6834A-04 Modification to correct nuisance fuse opening 6632
'7 MR 6834B-01 Modification corrects insufficient gate drive 6633
MR 6834B-02 Modification to correct nuisance fuse opening 6634
MR 6841A-01A Output voltage transient during output voltage level change 6635
MR 6842A-01A Output voltage transient during output voltage level change 6636
MR 6842A-02 Mod prevents false tripping of peak current limit switch 6637
MR 6843A-01A Output voltage transient during output voltage level change 6638
MR 6843A-02 Mod to correct harmonic residue offset current 6639
MR 6843A-03 Modification to correct nuisance fuse opening 6640
MA 70004A-01B Firmware upgrade kit 5861
MR 70100A-01 Modification to eliminate loose reference oscillator N-type connectors 6641
IO 70100A-02 Possibility of battery getting shorted when cover is replaced 6642
IO 70900A-14M List of firmware compatibility and history 5618
IO 70900A-31 Fractional N replacement kits 6643
IO 70900B-0 1H List of firmware compatibility and history 5619
IO 70900B-11 Fractional N replacement kits 6644
MR 8147-01 Firmware update to revision 1.51 6645
MR 8147-02 Hardware upgrades 6646
IO 83215A-04 Incorrect relay does not affect performance 6647
MR 832158-02 Mod corrects error E-53 due to bad temperature drift 6648
IO 83215B-03 Incorrect relay does not affect performance 6649
MR 83236A-01 Replace the cover assy and the shield cover of CPU board 6650
MR 83597B-01 Adjustments to correct band 0 harmonics 6651
MR 83599A-01 Adjustments to correct band 0 harmonics 6652
MR 83620A-02 Modification to A38 modulators to prevent oscillation 6653
1ST QUARTER 1997 BENCH BRIEFS 7
WWW.HPARCHIVE.COM
SN SN Abstract HP FIRST
Type No.
MR 836208-02 Modification to A38 modulators to prevent oscillation
Document ID No.
6654
r
MR 83622A-02 Modification to A38 modulators to prevent oscillation 6655
MR 83622B-02 Modification to A38 modulators to prevent oscillation 6656
MR 83623A-02 Modification to A38 modulators to prevent oscillation 6657
MR 836238-02 Modification to A38 modulators to prevent oscillation 6658
MR 83623L-02 Modification to A38 modulators to prevent oscillation 6659
MR 83624A-02 Modification to A38 modulators to prevent oscillation 6660
MR 83624B-02 Modification to A38 modulators to prevent oscillation 666 1
MR 83630A-03 Modification to A38 modulators to prevent oscillation 6662
MR 83630B-02 Modification to A38 modulators to prevent oscillation 6663
MR 8363OL-02 Modification to A38 modulators to prevent oscillation 6664
MR 83640A-02 Modification to A38 modulators to prevent oscillation 6665
MR 83640B-02 Modification to A38 modulators to prevent oscillation 6666
MR 8364OL-02 Modification to A38 modulators to prevent oscillation 6667
IO 83642A-01 List of calibration constants 6668
MR 8365OA-03 Modification to A38 modulators to prevent oscillation 6669
MR 836508-02 Modification to A38 modulators to prevent oscillation 6670
MR 8365OL-02 Modification to A38 modulators to prevent oscillation 667 1
IO 836xOA-01 List of calibration constants 6672
IO 836~0B-01 List of calibration constants 6673
IO 836xOL-01 List of calibration constants 6674
IO 836~1A-01 List of calibration constants 6675
IO
IO
MR
836~1B-01
83751A-02
83751A-03
List of calibration constants
Replacement fan part numbers
New firmware corrects external leveling problem
6676
6677
6678
r
IO 83751A-04 Firmware patch history 6679
IO 83751A-05 Incorrect password correction 6680
MR 83751A-06 Mod to replace defective power d o f f switch 668 1
IO 837518-01 Replacement fan part numbers 6682
MR 837518-02 New firmware corrects external leveling problem 6683
IO 837518-03 Firmware patch history 6684
IO 837518-04 Incorrect password correction 6685
MR 83751B-05 Mod to replace defective power doff switch 6686
IO 83752A-02 Replacement fan part numbers 6687
MR 83752A-03 New firmware corrects external leveling problem 6688
MR 83752A-04 Inspection and replace H 5 external detector cable (rear panel cable)
9 6689
IO 83752A-05 Firmware patch history 6690
MR 83752A-06 Mod to replace defective power d o f f switch 669 1
IO 83752B-02 Replacement fan part numbers 6692
MR 83752B-03 New firmware corrects external leveling problem 6693
IO 837528-04 Firmware patch history 6694
MR 83752B-05 Mod to replace defective power d o f f switch 6695
IO 8447A-09 Power switch replacement kits 6696
IO 8447D-09 Power switch replacement kits 6697
IO 8447E-09 Power switch replacement kt is 6698
IO 8447F-09 Power switch replacement kits 6699
MR 8517A-02 Test set Option 002 deletion 6700
f -
8 BENCH BRIEFS 1ST QUARTER 1997
WWW.HPARCHIVE.COM
SN SN Abstract HP FIRST
rl Type No. Document ID No.
MR 8517B-02 Test set Option 002 deletion 6701
MR 85422E-06 EPROM Firmware upgrade 6702
MR 85462A-06 EPROM Firmware upgrade 6703
MA 8560A-28A Modification to improve focus reliability 5950
MA 8560E-04E Firmware upgrade kit 5797
MA 8560E-06A Modification to improve focus reliability 5951
MR 8560E-12A Power supply reliability improvement 6338
MR 8560E-14 A17 CRT driver reliability improvement 6704
MR 8560E-15 Mod to prevent intermittent error 335 sampler unlock 6705
MA 8561E-03E Firmware upgrade kit 5798
MA 8561E-05A Modification to improve focus reliability 5952
MR 8561E-09A Power supply reliability improvement 6339
MR 8561E-11 A17 CRT driver reliability improvement 6706
MR 8561E-12 Mod to prevent intermittent error 335 sampler unlock 6707
10 85620A-04A Module hangup caused by improper programming 5746
MA 8562A-68A Modification to improve focus reliability 5953
MR 8562E-01 AI 7 CRT driver reliability improvement 6708
MR 8562E-02 Mod to prevent intermittent error 335 sampler unlock 6709
MA 8563A-2 1A Modification to improve focus reliability 5716
MR 8563A-24 A17 CRT driver reliability improvement 6710
MA 8563E-04E Firmware upgrade kit 5799
MA 8563E-07A Modification to improve focus reliability 5975
? MR
MR
8563E-11A
8563E-14
Power supply reliability improvement
A17 CRT driver reliability improvement
6340
671 1
MR 8563E-15 Mod to prevent intermittent error 335 sampler unlock 6712
MA 8564E-01D Firmware upgrade kit 6004
MR 8564E-05A Power supply reliability improvement 634 1
MA 8564E-08 Modification to improve focus reliability 6713
MR 8564E-09 A17 CRT driver reliability improvement 6714
MR 8564E-10 Mod to prevent intermittent error 335 sampler unlock 6715
MA 8565E-01D Firmware upgrade kit 6005
MR 8565E-05A Power supply reliability improvement 6342
MA 8565E-08 Modificationto improve focus reliability 6716
MR 8565E-09 A17 CRT driver reliability improvement 6717
MR 8565E-10 Mod to prevent intermittent error 335 sampler d o c k 6718
MR 8590D-08 Low frequency residual improvement 6719
MR 859OL-05 Low frequency residual improvement 6720
MR 859OL-06 Improved reliability with the new 75-0hm minimum loss pad 6721
MR 8591C-08 Low frequency residual improvement 6722
MR 8591C-09 Improved reliability with the new 75-0hm minimum loss pad 6723
MR 8591E- 10 Low frequency residual improvement 6724
MR 8591E-11 Improved reliability with the new 75-0hm minimum loss pad 6725
MR 8591EM-05 EPROM firmware upgrade 6726
MR 8592D-06 Mod improves reliability of the A3A2 Microwave Switch 6727
MR 8592L-05 Mod improves reliability of the A3A2 Microwave Switch 6728
MR 85938- 12 Mod improves reliability of the A3A2 Microwave Switch 6729
3 MR 8593E-13 Mod eliminates possibility of 150 kHz spur problem 6730
1ST QUARTER 1997 BENCH BRIEFS 9
WWW.HPARCHIVE.COM
SN SN Abstract HP FIRST
Type No.
MR 8593EM-05 EPROM firmware upgrade
Document ID No.
673 1
r
PS 85942A-02-S Lack of ground and possible defect may cause shock hazard 6732
IO 85942A-03 Connector changes are not backwards compatible 6733
MR 8594E-12 Mod eliminates possibility of 150 kHz spur problem 6734
MR 8594EM-05 EPROM fumware upgrade 6735
MR 8595E- 12 Mod eliminates possibility of 150 kHz spur problem 6736
MR 8595EM-05 EPROM firmware upgrade 6737
MR 8596E- 12 Mod eliminates possibility of 150 kHz spur problem 6738
MR 8596EM-05 EPROM firmware upgrade 6739
MR 871 1B-01 Mod allows VCO to reach low end fiequency 6740
MR 8711B-02 Phone cables used in A3 Frac-N board defective; GB prefix only 6741
M R 8711B-03 Mod to replace defective A2C 15 capacitor 6742
MR 87128-01 Mod allows VCO to reach low end frequency 6743
MR 8712B-02 Phone cables used in A3 Frac-N board defective; GB prefix only 6744
MR 8712B-03 Mod to replace defective A2C15 capacitor 6745
MR 8713B-02 Phone cables used in A3 Frac-N board defective; GB prefix only 6746
MR 8713B-03 Mod to replace defective A2C15 capacitor 6747
MR 8714B-02 Phone cables used in A3 Frac-N board defective; GB prefix only 6748
MR 87148-03 Mod to replace defective A2C15 capacitor 6749
MR 8719D-01 Improved phase lock performance 6750
MR 8719D-02A Metal can on second converter shorts external bias line to port 2 675 1
MR 8719D-03 Firmware upgrade improves phase lock, fieq offset, prog mnemonic 6752
MR 8720D-01 Improved phase lock performance 6753
MR 8720D-02A Metal can on second converter shorts external bias line to port 2 6754
MR 8720D-03 Firmware upgrade improves phase lock, freq offset, prog mnemonic 6755
MR 8722D-01 Improved phase lock performance 6756
IO 8722D-02 Numerical place holder for 8722D-02 6757 '
MR 8722D-03 Firmware upgrade improves phase lock, freq offset, prog mnemonic 6758
MR 8752C-01 Firmware upgrade corrects phase lock and power switching problems 6759
MR 8753D-01 Firmware upgrade corrects phase lock and power switching problems 6760
MR 892OA-12 Cooling fan's shield can become loose or fall off 676 1
MR 89208-02 New controller prevents power-up failures and intermittent lock-up 6762
MR 89208-03 Cooling fan's shield can become loose or fall off 6763
MR 8920DTS-05 Mod corrects ERROR 936 during getting SYS-CON 6764
MR 892 1A-05 Cooling fan's shield can become loose or fall off 6765
MA 8941OA-01J HP 89410 firmware revision history 5710
MR 89431A-03 Mod to repair RF section LO unlock failures 6766
MR E1485A/B-03 New main board prevents SICL errors after performing iclear vxi with V743 6767
M R E3610A-04 Mod eliminates oscillation from power supply's output 6768
M R E3610A-05 Mod eliminates output oscillation during changing load conditions 6769
M R E3611A-05 Mod eliminates oscillation fiom power supply's output 6770
M R E361 1A-06 Mod eliminates output oscillation during changing load conditions 677 1
M R E3616A-02 Modification to correct possible open circuit 6772
M R E3617A-02 Modification to correct possible open circuit 6773
MR E3631A-01 New line fuse improves Opt. OE3 (230 Vac input) 6774
MR E3631A-02 Mod removes output undershoot in the +25V power supply 6775
IO E3910A-03 Replacement power supply may require new mounting holes and screws 6776
r
10 BENCH BRIEFS 1ST QUARTER 1997
WWW.HPARCHIVE.COM
SN SN Abstract HP FIRST
Type No. Document ID No.
/7
IO E3939A-03 Replacement power supply may require new mounting holes and screws 6777
IO E4093A-03 Replacement power supply may require new mounting holes and screws 6778
IO E4095A-03 Replacement power supply may require new mounting holes and screws 6779
IO E4100A-03 Replacement power supply may require new mounting holes and screws 6780
MR E4205A-0 1 Mod to prevent BIP LED from flashing error state 6781
MR E42 19A-01 Revised assembly corrects design defects 6782
MR E42 19A-01 Revised assembly corrects design defects 6783
IO E4254A-0 1 Compatibilitywith 6Ons RAM SIMM Memory Modules 6784
IO E4258A-01 Compatibilitywith E4270A Datastore SSP/E4506 Datastore Card 6785
IO E4350A-01 Recommended replacement Keypad board, optical encoders and knobs 6786
MR E49 15A-01 Mod repairs pwr supply to fix E23:Search Fail error message 6787
MR E49 16A-01 Mod repairs pwr supply to fix E23:Search Fail error message 6788
MR E5 1OOA/B-02 Modification fixes I/O Port-C data error 6789
MR E5 1OOA/B-03 Modification fixes floppy disk "Media Uninitialized" problem 6790
MR E5 1OOA/B-04 Modification fixes llInpuformtl,"Inpurad",and "Inpudata" command errors 6791
MR E5 1OOA/B-05 Modification fixes output trace data error 6792
MR E5 1OOAlB-06 Modification eliminates excessive beeper sound 6793
MR E5 1OOA/B-07 Modification fixes input crosstalk test failure 6794
MR E5 1OOA/B-08 Modification fixes incorrect query response for Input 1 port 6795
MR E5 1OOA/B-09 Modification fixes error caused by "Autorec"file in the floppy disk 6796
MR E51OOA/B-10 Modification fixes "-225 out of memory" error in saving all instrument data 6797
MR E51OOA/B-11 Modification fixes incorrect RQS bit data in Status Byte resistor 6798
MR E5 lOOA/B-12 Mod prevents unit from hanging up when SMOOTHING is on 6799
'
1 MR E5 lOOAh3-13 Mod fixes EQUCO? command that returns negative value 6800
MR E5 1OOA/B-14 Mod prevents unit from hanging up when Number-of-channel set to 3 or 4 6801
MR E5 1OOA/B- 15 Mod improves unstable phase trace in absolute measurement 6802
MR E5 1OOA/B- 16 Mod fixes problem that saved trace data cannot be recalled correctly 6803
MR E5 1OOA/B-17 Mod fixes calibration interpolation problem when used with a test set 6804
MR E5 1OOA/B- 18 Mod fixes problem that marker does not respond correctly 6805
MR E5250A-01 New firmware prevents relay test failures of normal modules 6806
MR E5250A-02 New firmware corrects Auto Config mode connection problem 6807
MR J2301B-02 Replacement PAW link (mouse pointer) corrects operating problems 6808
MR 52301B-03 Modification removes transversal jitter in display caused by built-in mouse 6809
MR 52301B-04 Upgrade F/W for Quantum 540 MB and 1.08 GB hard disk drives 6810
SA 52301B-05-S Bottom chassis fastener (screw) interferes with circuit 681 1
MR 52301B-06 Undercradle interface card long leads short to chassis 6812
MR J2301B-07 Modificationsimprove reliability 6813
MR 52301B-08 Power supply snubber circuit modification 6814
MR J2302B-02 Replacement PAW link (mouse pointer) corrects operating problems 6815
MR J2302B-03 Modification removes transversal jitter in display caused by built-in mouse 6816
MR J2302B-04 Upgrade F/W for Quantum540 MB and 1.08 GB hard disk drives 6817
SA J2302B-05-S Bottom chassis fastener (screw) interferes with circuit 6818
MR J2302B-06 Undercradle interface card long leads short to chassis 6819
MR J2302B-07 Modifications improve reliability 6820
MR J2302B-08 Power supply snubber circuit modification 6821
MR J2306A-02 LAN select switch removal procedure 6822
1 MR J2309A-02 LAN select switch removal procedure 6823
1ST QUARTER 1997 BENCH BRIEFS 11
WWW.HPARCHIVE.COM
--- -I-
SN SN Abstract HP FIRST
Type No.
MR J2522A-03 LAN select switch removal procedure
D
Document I No.
6824
r
MR 525228-03 Replacement PAW link (mouse pointer) corrects operating problems 6825
MR J2522B-04 Upgrade F/W for Quantum 540 MB and 1.08 GB hard disk drives 6826
SA J2522B-05-S Bottom chassis fastener (screw) interferes with circuit 6827
MR J2522B-06 Undercradle interface card short to chassis 6828
MR J2522B-07 Modifications improve reliability 6829
MR J2522B-08 LAN select switch removal procedure 6830
h4R J2522B-09 Modification removes transversal jitter in display caused by built-in mouse 683 1
MR J2522B-10 Power supply snubber circuit modification 6832
MR J2523A-03 LAN select switch removal procedure 6833
MR 525238-03 Replacement PAW link (mouse pointer) corrects operatingproblems 6834
MR 52523B-04 Upgrade F/W for Quantum 540 MB and 1 .08 GB hard disk drives 6835
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