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SERVICE INFORMATION FROM HEWLETT-PACKARD
JANUARY-APRIL, 1976
* 0%
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LOGIC SYMBOLS logic. Thoge wbo interpret the circk as
bv TO^ rmpmr
State Devbs). This first
Internal and external in-
h subsequent articles
showing how these indicators are
combined to kmrr memningful and use-
ful &jic $ymbJS.
physical value, the l s po&W level
es
The primary purpose of the new being the Low state. A polarity i n d i i o r
standard is hopefully another step to- symbol at an input indicatesthat a low
ward eliminating the confusion be- input is required. A polarity indiitor
tween positive/negative logic levels, symbol at an output indicates that the
and resolving the controversy be- output i tow. High inputs and high
s
twmn"p0larity" thinkers and "stab'' at9 Shawn w w u t the polerity
ttdnkers. Toward t i end, the
hs r symbol. The polarity indicator
aryl allows two generai types symbol on the output of the NAND
symbols; rectangular (IEC) and dis- gate shown in Figure 3 can be cor-
tinctive shaped. Then, for clarity, qual- Note tne use of H (hih) and L (low) in rectly interpreted only one way: the
ifiers are placed inside and outside the the truth tables. Keep in mind that the output will be low when the two inputs
logic symbols that describe the exact device is going to respond to Highs are high. The polarity indicator symbol
function of the circuit, the polarity that (more positive level) and Lows (least on the output of the NOR gate shown
is required at the input, and the polar- positive) and the operation of the cir- in Figure 4 will be low when either
ity that results at the output. cuit is not going to be changed by the input is high.
choice of symblogy in the documen-
tation. Remember that to use 1's and
INTERNAL QUALIFIERS 0 s would lead to confusion because
'
you don't know if a circuit is positive
An example of the qualifiers used in- (H=l) or negative (H=O) true logic.
s& the logic symbols to indicate the
function of the circuit are shown in
Rgures 1 and 2. Figure 1 shows two EXTERNAL QUALIFIERS
AND gates. The & (ampersand) indi-
cates that all inputs must be activated The old MIL STD 806 used a circle
to obtain an active output. Figure 2 (negation indicator symbol) at input
shows t o OR gates. The expression
w and/or outputs to denote inversion
b 1 indicates that the output will be (see Figures 3 and 4). However, an
o;rc2Eule only if the q u a n t i of active in- interpretation problem came to fore
puRs i equal to or greater than one.
s because of positive and negative
- -
LOGlC SYMBOLS
J]
albv f b use of the " w i d OR" con-
netztlw'bf oufputs (see Figure 7).
c,
The output delay indicator symbol
( 1 ) indicates that the output be-
mmes effective when the signal that
initiates the change returns to its op-
posite state (see Figure 6).
The non-logic indicator symbol
( -st- ) denotes that the input or out-
put so marked doers not carry logic
information and has no effect on the
logic function. Fqum 8 shows appli-
tions of this symbol.
Sensitivity to transition or edge sen-
The next issue o Banoh Briefs will
f
show how some of these symbols are
tion from low to high, and Rgure 5b, combined to describe complex logic
with the addition of the polarity indi-
hibting input remains at its high state. circuits.
cator, requiresa transition from high to
low. If the dynamic indicator is not pre- The inhibiting input symbol is used
sent, then the line is level sensitive. mainly with three-state devices to
ELECTROLYTIC
CAPACITOR DAMAGE
who has been with BY SOLVENTS
Aluminum electrolytic capacitors may
be damaged by halogenated
hydrocarbon fluids in cleaningand de-
Them flwkk, when
micro wave reja
cause failure due to co
manu& for an Educ&tk)nd T W - should also be exercised by service
sion R e c e h r l F m a m p ~ rand a 4 technicians using circuit coolants for
GHr portable Mbmwawe Fbpeater. troubleshooting and repair as the
aerosol cans use flurocarbon com-
Torn b an wtive Cubmaster and en-
joys phtogmphy, ham mdio and pounds for propellants.
furniture refinishing. He lives in
Sunrtyvde, Cal&mia with his wife When atuminwn etectrotvfics are re-
and six chilckgn. placed in the field, we re&mmend that
any flux residues be removed with
isopropyl or methyl alcohol.
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3580Al3581AlC 3581C units up through 1411AOO225,
there is a possibility that the screws
SPECTRUM ANALYZER which attach the handle to the instru-
HANDLE ment will become loose and fall out.
This resutts in the handle coming off
MODIFICATION the instrument on one or both ends.
The old screws should be replaced
There is the possibility of the handle with a new screw HP Part No. 03580-
assembly of the 3580A13581AIC be- 26001, and locking washer 3050-
coming loose if it does not have a new 0426. This new screw has a head
self-locking screw installed. On all shape and size which prevents it from
3580A units up through serial number turning and coming loose. For more
1415A00975, 3581A units up through information, refer to Service Note
serial number 1351A00230, and 3581NC-21358OA-3.
!
8558B SPECTRUM ANA- DELAY LINES
LYZER TRANSISTOR It is possible for a delay line to change
PART NUMBER itselwtrkat characteristics due to time
CHANGES and heat build-ups. This usually
shows up as a degradation of
Two transistors in the 85588 have had bandwidth and risetime; especially in
part number changes. The Second scopes with a bandwidth of 10 mHz
Local Oscillator Transistor, A5A1Q1 and above. So, ifcomponent changes
(35824A), and the Second IF in a unit have failed to correct BW or
BandpassAmplifier Transistor, A1O Q 2 RT problems, try a new delay line.
(1854-0606), have both been changed Note that any soldering performed on
to 5086-4218. or near the delay line should use as
little heat as possible.
When ordering replacement transis-
tors, please use the new number to
expedite your order.
POZIDRIV vs PHILLIPS the toque advantage because of its 8710-0949 Offset Pozidriver, 4" for
tapered tip. It will tend to climb out of 2, 4, 6, 8, & 10 screws
Does your Phillips screwdriver keep the recess under heavy toque. Look -
Vermont Tap & Die
slipping out of that screw and stripping at a Pozidriver and you'll see that its 8710-0945 Screwholder, 7" for 4, 6,
the head? If so,its quite possible that tip has straighter sides. As a result, it 8, & 10 screws -Vaco
screw is actually a Pozidriv screw won't fit Phillips-head screws. The Products #K-16
rather than the older Phillips design. screw will even stay on the end of your
Pozidriv is the trade name of Phillips driver without a holding device, the fit
International, who developed this type is so precise.
of screw which is used in many HP
instruments.
The following Pozidriv tools are avail-
able from HP:
The crossed-slot pattern in the head of
the Pozidriv Screw has sharper, 87 0-0899 Pozidriver, 3-1/8" for 2 &
squarer corners and presents more 4 screws -
Stanley
driving surface to the screwdriver than tool #2951
the Phillips. If you have a Pozidriv 87 0-0900 Pozidriver, 4" for 6, 8, &
screwdriver, you can put more toque 10 screws -
Stanley
on those stubborn screws without tool #2952 How can you tell a Pozidriv screw from
burning or stripping their heads. A 87 0-0948 Pozidriver, 1 0 for 6, 8, & a Phillips-head? Fortunately, that's
regular Phillips screwdriver will work 10 screws - Vermont easy. All Pozidrivs have starpoint
on Pozidriv screws but won't give you Tap & Die markings, like those illustrated above.
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3480AIB-8A DIGITAL VIDEO PLAYBACK CLEANING SOLENOID
VOLTMETER EQUIPMENT FROM CONTACTS
HEWLETT-PACKARD Intermittant or dirty solenoid contacts
If you made the modification are easily cleaned by the following
suggested in service note 3480A/B-8 Hewlett-Packard now offers videocas-
sette color playpack equipment that method.
to correct random "8000" Bit errors, it
probably transposed the problem to a can be used to bring you a wealth of
knowledge from HP's videotape 1. Saturate the edge of a sheet of
random "1000" Bit error at a slightly writing paper with alcohol.
higher operating temperature. The library.
modification performed in service note 2. Insert that saturated edge between
3480A16-8 is still good. The new mod- The equipment shown in the picture the contacts, and while pressing
ification for fixing the "1 000" Bit errors includes: gently on the movable contact,
slide the paper through. See the
is replacing integrated circuit A1 1IC28
Figure. Repeat this several times.
with HP Part No. 1820-0094 as per
service note 3480AJ0-8A. 90167A
Sony VP-2000/RFK videocassette NOTE
player with RF modulator to permit Do not allow paper to tear
program playback through a television or shed.
receiver. 60 Hz, 120 VAC, NTSC
color. (50 Hz version coming soon.) 3. Saturate the edge of another sheet
of paper with freon and repeat step
90129B 2.
Sony KV-1910 Trinitron, 19 inch tele- 4. Check that no shreds of paper
vision receiver. 50-60 Hz, 120 VAC, have lodged in contacts.
NTSC color.
90140A
Sony GC-4A cart.
Please note that HP video tapes are
recorded following the NTSC color
standard and are compatible only with I
equipment that uses that standard.
1740A OSCILLOSCOPE
Do you get oscillations on the sweep
when udng mixed mode? If so, try
changing A9R2 (on the delayed
sweep board) from 82 ohms to 150
ohms (HP Part No. 9757-0284) as per
service note 174OA-4.
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SERVICE TIPS
I
I
SPECIAL NOTICE FOR users of HP-IB products purchased A special program has been set up by
over the past few years, please note Hewlett-Packard to assist customers
USERS OF HP-IB that the connector locking threads on in converting the connectors on their
PRODUCTS those products are non-metrie and -- older HP-IB products to be compatible
they are therefore not compatible with with the new standard metric-threaded
Hewlett-Packard fully supports IEEE metric threaded connectors now being connector. Until 1 July 1976, we will
Standard 488-1975, includingthe pro- produced per the IEEE Standard. provide HP-IB Metric Conversion Kits
vision that IS0 metric threads be used at no charge to customers having HP
on the bus connector lock screw and products (instruments, cables, control-
corresponding stud mount. This Two different metal finishes are being ler interfaces) with the non-metric
means that future HP-IB products will used by HP to help you tell the differ- connector; after that date a modest
come to you already equipped with the ence between metric and non-metric charge will be made for the kit.
proper metric thread connector connectors. Whereas the older non-
hardware. metric parts have a shiny nickel finish,
all metric-threaded lock screws and
stud mounts have a black finish and Please contact your HP field engineer
If you are among the many present the letter "M' stamped on them. or service representative for details.
PAST SEMINARS please indicate so on the requalifica- notified about the seminar dates and
tion form. This will ensure that you are locations.
The lastBench Briefs mentioned Dick Gasperini presented the Digital This photo, taken in Toronto, Canada at
Service seminars being offered at SeV- Troubleshooting seminar in Los Angeles, the 8555A and 8552AIB Microwave Spec-
era1 iOCatiOns in the U.S. and Cimada. California and Paramus, New Jersey. This trum Analyzer seminar, shows students
has been one of the more popular semi- checking the bandpass filter on the 8552
Many readers commented on the nars, with mostsessions filledto capacity. Spectrum Analyzer.
shoA time between the arrival of
Bench Briefs and the start of the semi-
nars. Evidently Bench Briefs was de-
layed in the December mail more than
anticipated. To alleviate this, separate
mailings are planned for the future
when a crowded schedule is
anticipated.
If you want to be certain to receive
information about future seminars, r I
FUTURE SEMINARS PREREQUISJTES SANTA ROSA, CALIF
AUG. 23 - 27
These seminars are intended for re-
pair and calibration technicians who 8620C Sweep Oscillator
have some knowledge of analog cir- 86290A 2-18 6 Hz Plug-in
OBJECTIVE cuits, digiial circuits, and phase lock 0555A Spectrum Analyzer
loops. 85528 Spectrum Analyzer, IF Section
Provide the electronic repair techni- 85588 Spectrum Analyzer
cian with the training needed to:
-
PAL0 ALTO. CALIF
AUG. 30 - SEPT. 3
- Understandall panel control opera- LOCATIONS
tions as they relate to the func- 8640NB AM-FM Signal Generator
tional block diagram.
" Both seminars will be held in Califor- 8660 Synthesized Signal Generator
- Interpret signal waveforms and vol- nia. The first is at the Santa Rosa facil- Tuition wil be $350.00 per week.
tam levels at test points. ity where most of our spectrum
- Efkiently perform'critical adjust- analyzers are manufactured. The sec- Other particulars such as course out-
ments. ond is at Palo Alto which primarily line and registrationinformation will be
Isolate troubles to the individual manufactures microwave signal printed in the next issue of Bench
circuits. generators. Briefs.
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I
SAFETY RELATED SERVICE TIPS
(and control knob set screws) am
1
SAFETY RELATED above ground pc4mtW. Inorder t w o
SERVICE NOTES your instrum for this potmti~l shock a. Check for continuity between
hazard, rs$ertuonsrof~atukwevia9ed inner chassis ground and the
Service Notes from HP relating to per- p w d u r e s below. P m note that
k m set screws of each control
sonal safety and possible equipment morewai atructions ate avail- knob.
damage are of vital importance. To able on the senrice note.
make you more aware of these impor- Infinity = OK
tant notes, HP has recently modified If the instrument fails the test it can be
the Safety Service Note format. The made to conform to current $safety
note is now printed on paper with a red standWs With one of the appropriate
border, and a "4" suffix has been modWZGation kits from TaMe I.
added to the note's number. In order
to make you immediately aware of any
potentialsafety problems, we are high- a. These instruments all have a
lighting safety related Service Notes in
TEST PROCEDURES terminal or lead marked LOW,
this section of Bench Briefswith a brief COMMON or - (minus):Check
The instruments are grouped into five for continutty between this
description of each problem. Also, in
order to draw your attention to safety basic tests; look for your model negative.side terminal and the
number and perform the steps given set screws of each control
related Service Notes on the Service
Note order form at the rear of Bench with an ohmmeter to determine if your knob.
Briefs, each appropriate number is instrument needs the modification.
printed in color. Infinity = OK
a. Set the ohmmeter to the 1K
ohm range.
3 7 W 0
.
VOLTMETERS - b. Turn the power switch OFF,
disconnect all power cords,
OSCILLATORS a. This instrunlent requires the
cables, and grounding straps
from the instrument. aslx3fnW be con-
Some older voltmeterloseillator-type .Chgckfarcontinuitybe-
instruments have a POTENTIAL nHfssn ttw iow (mid&) lmninal
SHOCK HAZARD. If the instrument is and the set screw8 of each con-
floated above ground, control shafts l.-, 204D, -A, trol hob.
Infinity = OK
4.330049
a. Connect one ohmmeter lead to
shield ground. Check for con-
tinuity to power line ground and
then output ground.
Continuity = OK
a. Remove the plug-in from the
3300A mainframe. Connect
m e ohmmeter lead to the end
plate on the p a r of the plug-in.
Refer to one of the following
steps for your particular plug-in. 0
b. For the 3302A -check for con-
tinuity to the set screws in the
STARTlSTOP PHASE, MODE,
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i
SAFETY RELATED SERVICE TIPS
;
111 :: i
and INPUT PHASE controls. the back side of the power receptacle
for the "t" designation.
Infinity = OK
If continuity exists, the wiring is cor-
rect If the wiring is not c o m t , unsol-
c. For the 3304A -check for con-
tinuity to the set screws on all
control knobs except the fre- power rwept- st& reverse them. If
b quency control. the wires tiwe nst kmgens@, replace
them with longer wires of the same
Infinity = OK gauge and odor code. If for any If continuity exi&s, the wiring is cor-
r e m n it is itmnmient to perfm
the instrument may
-
d. For the SO58 ch$rckfor con- ur nearest HP o f f i contscps on the primary power line fil-
tinuity to the set ~GC&HNZ)on the
red and black SWEEP TIME
where it will be done a no cost.
t ter (seethe figure m).
and SWEEP MOM controls.
lnfiisty = OK SIGNAL GENERATORS
Several of the following signal
generator-type instruments may have
a potential shock hazard at the trans-
1331NC CRT former primary due to the hot and
neutral primary power leads being re-
Several 1331NC CRT Display-type versed at the input receptacle.
instruments have a potential shock
hazard. It is required that instruments
with double pole power swstohes have 608B Signal &merator
the "hot" side ofthe AC lhve c o n n m 61461616B VHT S@ml Generator
through the fuse. The 8rnA Moduwr Make m W n that the ma
that $ma of @e Da pa s haw the
irly 8-A SyncWnizer
wires betweenthe AG power recepta- figure above. If f k y are nd r m
e -
cle and power switch reversed. To
check your instrument, remove the To check your instrument, remove the
power cord and fuse and check for power cord and fuse and chwk for
continuity between the power recepta- continuity betweenthe "hot" contact of any reason it is inconvenient to per-
cle pin "L" and the center post d the the power receptacle and the rear form this modificatbn, the instrument
fuse holder. It may be m r to my terminal of the fwe holder. Refer to may be returnad to your m r s M
ae t P
remove the bottom CoVBz and inspect the figure below. office whem it wu4 be at no cost.
AUTOMATIC MICRO- ments Using the HP 436A rswJer Me-
t&' describes five
WAVE POWER
W
MEASUREMENTS
of demonstration softuvarr, erx%mp)es
By controlling a microwave power are included, so the nit
- user
meter wlth a scientif~ccalcuiator and can get a mini-system Nnningquickly. phone lines.
manipulating the measured data, a
microwave engineer can gain a can-
siderable increase in capability over One example, of special interest to
traditional power measurements. calibration labs, is calibration of COB-
Hewlett-Packard Application Note xial attenuatorsup to 18 GHz with t py For a copy of Application Note 196,
196, "Automatic Power Measure- ical accuracies of k0.2 dB a 20 dB.
t please contact your local HP office.
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41061
d a
4WA-7-S. WSIORS
482molwALiDomRMEra
4 3 2 6 - a Serials 1 -
5 and Wow. ModiHtccction to
impove oparstlonwith mltd meorder.
t 7 4 w OSCUOBCOPE
6066S$QNAL~lOft 174OA-2. AH SWWS. careo VMW preampliffw inte
t
606E?l-S. M 1401A03959 thru 1 5 1 W 1 . gr drcutt.
w
Elimmatbnof potentiai shock hazard. 1740A-4. Serials 1526A and Mow. Mixed sweep
osdl-.
I#)(wFSIWdALQusERATQRS
BOBWF-19. All aerhda. R e c o m replacement for ~FuwcnonQuslRAtoR
NEED ANY SERVICE CR22. 33oAA-104. serfelr below 0939A08728.Etiminaabnof
a potenW shade hazard.
NOTES? 614A W WNAL QthpRAToR
614A-FS. W a l s 1311A04Sl$ ttuU 1447AO4540. ~ ~ L O C K P L U Q W
Em
U- of pobnW sho& hazard. w s
33024-5-5. E W bebw 0? 1 - 6. ElimCIaabn of
a patentral shock haurd.
Here's the latest listing of Service 6166 UHF 8Kl)(rzL (IENIIRATOR
6168-6-5. Serials 1317A03291 thru 1438AO3329. -A SWEEP/WFSEf P L M
3304A-2-9. All Serlsls. EIimlnatknof B potentlelshock
hazltrd.
74im &G-DcommmwL
VOLTUETER DC ttAwwllD
741A-9A~W4lElOA-S.Runriabm, to m h h b shock s,oUtpn-.
related Service Notes here, each one potmwls. 940 DiGllAL VOLTMETER
is marked by a "-S" suffix. On the m M e L 145A-Mlu Ac cAuwuToR 3460A-16A-S/346OB-ll-S. Revkrbns to minimize
Service Note Order Form, 745A-H18-16. Serials belMw 1319AO1671. Improve-
shock pobntlals.
related Service N ments to the re#ability of the 745A-Hl8. 34mNB ~ A L v o l T m e m R
printed in color. To 3480N0-8A. Serial numbers. MI that have been
for instruments you own, remove the
order form and mail it to the nearest
HP distribution center. 122ONW21N1 4 0-
1pA -S L
122OA-21/1221A-9/1222A-1. Service procedures to DtQRALVOLTMETER
replace CRT.
1310Nl311U1317NlS2lA DISPLAYS
HP i i x SRPS OBcnLoscopEs 1310A/1311A-16. 131OA 1s2OA snd below;
reference of U@ RIters and 1311A aeriefs 1449A and t w Repteannent part
& .
w e on HP 13XX display nUmbersforAlU1 . n b / C r W .
1317Al1321A-1. 1317A
1321A aeripls 1
-
1411 8T@RAQ@ WtW.OSCOPE8 numbens for AlU1 and/or A9u1.
141T-5. Seriprs 1502Ala)43 and bW. Revisbn to
impove bawltne cnppsr ofmatbn. 1;)81NC D # ) P u Y 349OA-11. An serials. Rephoemsnt part nmbef for the
1331NC-184. 1331A serkrlS 1426A thrU 1520A; rsbrut HPB opticel bdetton aseemwf.
204cOSCU-LATOR 1331C serials 1M4A thru 1513A. Etimlnatbn of
204C-2-S.RevWns to minfmlze shock potentials. potential shock hazard. 355lAlsssu R
-
T TEST 8ET
3551N3552A-3. Modifications to improve
204D OSClLLATOR 1 W A X-Y DISPLAY performance.
204D-2-S. Revisions to minimize shock potentials. 1335A-1. Serials 1514A and below (all options
inclusive). Modikations to nnmprwe reliability. 35SSAPSOPWUETR
2OOA OSCILLATOR 3556A-U-1001. Serials 13481101725 and b 8 b W . k-
209A-7-S. Revisions to minimize shock potentials. 1 W A RS232 INTERFACE placement pari numbers for A3Q1,2.3, and 7.
l645A-3. New circuit bard j01645-66517) provides a
U1A P w OSClUATOR transmil data inhibil circul SWOAFREQLEMWSYNWSZER
241A-2-5. RebMons to minimke shock potentials.
1o OsCnL~Es
nm 3570A-6. All ssrisls. xk I"pecuw to PC board +-
merit to Improve reliabJity.
310A WAVE ANALYZER 171OA-5. All serials. Refened fepkcmmt for A3C1.
31OA-SA. Serials 0948A03309 and below. New 1710E4. All serials. Rentacementfor attenuator detent mNCMIALYZERS
inductor on local OscwIptOc essembly. Wheel. 358OA-2. Standard 8WIpiS 1415AO1414 end bebw;
358OA-OpNon 002 serhJs 1415AO1215 and below.
331UW.A DlSTORllW ANALYZERS 1712A OSCKLOSCOPES New overbad spedficetbns.
331N332A-104. !serials bekw 1149Ao7206 for the 1712A-2. All serials. Rsplachg attenuator termination 358M-3. seriels 1 15 4- and below. Repair Of
331Aandbebw1140Ao6311forthe332A. Elimina resistors. bose or broken oanyhg handtes.
tbn of a poteatial shock hazard. 1712A-3. All serials.Replacement for attenuator detent 358OA-4. Modtbtbns to raduce repah costs.
wheel. 3581Atc-1. 3581A eerisls 1351AM1375 and below;
33
3- DlSTORI1oc( ANALYZERS 35816 88W8 1 1 - 41 end bekrv. Alew Ww-
W 3 3 4 A - 9 - S . Serials below 1137A03316 for the 172oA OBCILLOSmPES b d swciffcetbns.
a
333A and below 1140/\06311for the 334A. Elimlna- 1720A-7. All serials. &placement for attenuatdr detent 3 5 8 i a 6 2 . W 1 A serials tsrllA00230 and bekw
tbn of a potential shock hazard. wheel. 3581C serials 1411A00225 and below. Repair oi
loose or broken carry handles.
SERVICE NOTES
S W O m l A CESIUM BeAM 8553W855SL SPECTRUM
FREQUENCY STANDARD
5061A-7. Reoommended 8 n g I t ~ ~ h g
impwements.
-
ANALYZER RF SECTION
855352. All serials. Pmcedure for intensity h ad-
i
t
justment of 141T display sectbn.
~A/5302A/53a3AA/53oSN 8553L-7. .All serials. Recommended replacement for 87WASYNWWNUER
SSWN53WA COUNTER MODULES scan wfdth switch aswnbly. 8708AJ-S. Sdi.ls 1220AO1671 thnt 1220AO168J.
53OOA-1B-S. All serials. EUminatkn of potential shock Elminatbn of potsnncll ShDdC hezard.
hazards.
-A UNlVERsAL COUWER
-
65wmS6m SPIICTRUM
ANALYZER RF SClWN
855451. All serials. Procedure for intensity lamp ad- 1msluBK: HplB CABLES
5328A-1. serids bdow 1548. Mod#lcetbn to event ushnent of 141T &splay section. 10631AiBIc-2. Recommended replaoement pluts.
bss of displayed mading wlth sample rate hold. 8 L-5. All seriels. R d u r e for intensify lamp ad-
5328A-2. !hrIals belaw 1548. Modiliccltkns to prevent justment of 141T display section.
extra counts in start ckwk "phantom funcUon". lla6lrVe FRmlmMCY #TIE;wI)Io)( MODULE
11Be)lA-12. AH -8. of falS0 kwk Of YIG
QoloA MULTRWOaRAYmR (UWOB SPECTRUY ANALYZER
894OA-2. Serials 1321M)o598 and below. Inaeadng 8558510. serials 14MA and b eA7 frequency
e. 11 1538M0480 and wow. lmpoved
drhre capability of the 1 MW osdllator. board co &b8ity with dot matrix LED and seven 4.43 oscillator stability.
segment% diglEal penel meters. 1166155A. sarws 1543MX)s20 and wow. Reven-
looIuB x-Y RECORDERS tion of false kdc OSYKJ phase bck bop.
7-18. Serials below 1WOA. Recommended inte- W N B SWAL OENERATOR
circuit replacmmL 884OA-27. Serials 1536A and below. "Reduce Peak
. Serials 1544A and betow. Recommanded S311B W XA SWITCH
Al L
Power" lamp drive modificatkm.
new Y-axb wiper plate assemtJy and pen carriage 8840828. Serials 1526A and bekw. "Reduce Peak 3331151. An serials. Cleaning of solenoid contacts.
bbck. Power" lamp drive modification.
m64A X-Y RECORDER EuawARFpuKHN
7034A-8. serials 1542A and bebw. Rec~mmendd -A S y w T ) o SIQWAL QElqERATOR 8829OA-1. Serials 1450A and below. Coupler/
new Y-axis wiper plate assembly and pen carriage 8660A-16B. All serials. Internal crystal oscillator Modulator replacement kk.
w. installatkn.
8660A-218. Serials 151BAOO760 and bekw. k me
n vd
100 MHz refenmce Rlte -A 0.1-20 QHz HETERODYNE MODULE
7OM8 X-Y RECORDER
886oA-27. Serials i5d&b wow. Improved
and -.
4 All serkrlo. lmpoved amplifier kit.
703553. Serials 1543A and below. Recomme+d
new Y-axis wiper plate assembly and pen carrmge
block.
power
8660A-28.sua?!sll and below. lnaeased
3upp)y current and b a a e d rating of A-11.
8632oA-4. All Serials, Improved frequency converter
kit.
704U X-Y RECORMR -1A RF OIY
7046A-U. setkrla 1503 and baow. Improved Y-slider SYNIIIESmD 8MNAL GENERATOR 86801A-8. Serials 1551A01021 thw 1443A00782.
m-. 8880518A. Serisls 1343A and below. Recommended ModHioatbn to preJventintennment attenuation.
P 0 A X-Y RECORDERS F for A-7 pomw kle module.
Elm. All serials. 100 MHz reference fl
86608-31. seriels. Improved powa sw-a-
7202A-l3/72034-14/721OA-1~-17. m- 7
-
rials 1541 and below; T2f)3A/721WSW2A serials
1540 and belaw. Recxnnmended new Y-exb wiper s S - 5 . All serials. Internal crystal oscillator
pia@ End pen canfa* bbCk. instBnatbn.
888oc-6. M l 153WW340 and W W ItnWOWd
as O .
WI1lA WLW QENERATOR power supply rellabisty.
8011A-fX. Serials 1 4 1 1 ~ 1 and bdow. ModlRca-
0 888067. Serials 1615A00541 and bslow. Increase4
tbn to prevent i -
n bunt m atlowtrlgger supply current and increased rating of A4A2R11.
fmquency or single cyds.
#IOONB SWEEP OSCILLATORS improre'oraputpower tfatnecw.
MOSA Y O W U T O R 88901\-14A. All s W 889061OA ssrials 1349A and
e . Bs603A-4. Serials below 1551AOO311. ModMcatbn to
8403A-9-S. Serials 1431AU2656 thru 1526A03089. bebw. Thermal protrctive switch modiflcstkn Wt. prevent intermwtent attenuatbn.
Elimination of poterrtlal shock hazard. -A-15. An serials. Modlkatbn to prevent osc9la-
tbn in +275V and -3WV power s
848lA POWER O # E O R 8-11. serials 1445A and bdow.%%&atbn to ~AYOOULATIoElSECTION
8481A-2. Serials 1234A and below. Recommended prevent osctllatbn in +275V and -300V power 86632A-6. All serials. Suppression of spurious
replacement for input empfiiier assembly. supplies. osd#rrtbn.
other Bench Briefs readers, let us hear from
You-
Editor:
This may be worthwhile for service technicians
that wish to use their HP-21 to convefl dB to
Vdts and Volts to dB in 50 ohm systems.
dB to V d t r V o b to dB
1) KeydBnumber 1) KeyVdtsnumber
2 PressENTER 2 PressENTER
3 Key in 10
1 31 Press x
4 Key in .05
51 Press f
Here's your chance to share your Ideas and M e r ' s Comer will feature anythlng from
Reader's Comer, we will print lettars to the tronlc s8wk@PWIWUlOl
Edltor, trwbl.ahootlng tips, moditicationIn- Cra' Voss
formation, and new tools and producta that H&-Pa&ard
have made your job easier. In short, tf there is something you have to share with Benevue, WA.
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i
Edilor:
Tbr "Baw wp", repmedm "aallles for
the uperintstligsnt" proved that I am not
superintelligent. However, after a few false
Wm* Dear Mr. Gasperini:
I wo&I like to submit the W W i quiz. I hope As per our telephone conversation, we are for-
you enjoy it as much as I enjoyed yours. warding to you for your evaluation one
transistotldiode checker similar t the one used
o
by G"rg Stanlet Troubleshooting Transis-
Six people work in one office. The
Abk, Mr. &eksr, Miss Jonas e.are: sMr.
L*, Mr.
sa p sto in
o ii n
torized ircults aster, in the September-
October 1974 BENCH BRIEFS.
ant Manager,
Mdckrk.
The `Tester In-Circuit" would be $19.95 each in
Uaethe lollowkrg dues to oornpsete an Mganiza- quantities from 1-200 and $14.80 each in awn-
tion c a t of the otllce.
hr tms of 200 or more.
1.
a) TheAsWantManageristheManager`s Sincerely,
grandson.
b) The Cashier i the Stenographer`s son-in-
s C. M. Barber
IW. The Barber Corporation
Boac 271
c) Mr.Ablebabeohsler. Waynewik, Ohio 45068
Thank you MI. Berbsr: We pass r & dong m
h
4 Mr.BtakerisaneghbaroftheManqer. our readem as e further eW In mbhWmothg
transkivr ckcuits. 2.
Betty W i s
Hewlett-PackaKl company Editor
Pal0 Alto, California
Dear Sir:
Dear Sir:
I have gone through the artkk 6n " F B F " by
Rod Parks in the Ma -June 1975 issue of
As a kng-tbne recipient o BENCH BRIEFS we
f
have been using the d8m-to-Vdtage Chart pub-
lished in BB of April 1973 ever since, it is a bit
Q
BENCH BRIEFS. ~a r s st you pu~ish a worn now!
*LTPY;"
similar article on (2folerance Percent
Would it be possiblethat we t 2 morecopies
Defective) how it i calculated etc.This will ena-
s of this April 1973 issue of BBrWe should have
ble to clarify this term also. Shall I hope that copied it but it is t o worn now.
o
such an artlcle will a w r shortly?
If I may make the s
Thanking you,
S ~ e P h g o i n g ~ ~ 32 Et:
watts,foruse into 5o-eoodvna would be fealty
Yours faithfully,
useful for readers of BB.
s. Gopakumar All In all, BB Is one o the few publicgtions we
f
Satellite Systems Division
Vikram Sarabhai Space Centre keep on file. I think it means something! 3. r t a a P e d w R J , c w M a f o w m b w w i m ~
Trivandrum, 695022, India and he recosnmended crslng the setup
Yours truly, shown belcrw taken ftom t&u 1976 HP
cetglog, pegs 350, F i g m 3. He d d re-
An article on reliability and related topics is Robert H. Fransen commend using a stmc&W defieolDr &#-
planned in the near future. Omnitek Electronics ecterized at y u partbuhw h q m y frw
or
Sherwood Park, system calibradkn.
Editor Alberta, Canada
Dear Mr. Gasperini: Gad to accommodete your requeet, it should
be In F e malSn(l0n Ets way.
h
to the tstter from Leon Fink (MayJune
~ ~ ~ B ~ atout the unusual transistor
i E F S We are looking at the graph now and wlll con-
failure. Here at dincinnati Electronics we have sider your suggestbn for a f r issue.
me
had the same type of failure at least once in
the last six months. Editor
Could BENCH BRIEFS possibly publish an ex- Dear Mr. (3asperini:
planation for the bias voltage increase.
Sincerely, Iwanted to let ou know that we certainly enjoy
BENCH BRIE&. I hope you are not too bus
Allan Cooper and can answer some questions regarding H6
Senbr Technical Specialist instruments.
Cincinnati EIectronic Corp. Inc. 1. What is an acceptable level of paver supply J
ripple and regulation for HP oscilbseopes Figure 3
Ihave not encounrered one of these personally such as the ia w l WNI a c t 1200 series?
and am at a loss to explah why it happens. 2. Are you (or any of your readers) aware of a
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