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r
1
t
i
Communications
Nancy Thomas,
HP Stanford Park Diu.
Ask a service engineer or technician
what training they need and you're
likely to hear, "We need measurement
and applications training." If you
think about it, the request makes
sense. Understanding the environ-
ment that instruments operate in is
a valuable addition to one's trouble-
shooting tool kit.
Hewlett-Packard has developed an
c interactive training program aimed
at new technical entrants in the field
of digital microwave communications.
If you or your group is involved in
servicing microwave communications
equipment, you'll want to order a
copy of the HP 11736A I-& Tutor, a
digital microwave communications
tool. 4
Structured Like a Laboratory
Workbench -t
t 10;
I-& Tutor is educational software
'
with a manual, and is designed to be
used with the popular HP 9000 Model
216 or Model 236 computers. "I" and m
um
" Q stand for the in-phase and quad-
rature phase signals of complex phase t l
modulation used in today's digital HP Digital Microwave Communications Guide
microwave communications systems.
As shown in Figure 1, the program signals at various nodes of your sys- one I-& Tutor package. There are no
is structured to model a complete tem model in the time, frequency, heavy theoretical discussions or dif-
digital communications system, from and vector domains. ficult mathematics involved. You
the analog signal input through mod- learn through a visual, intuitive ap-
r ulation, transmission, demodulation,
and conversion back to analog. Fig-
ures 2-4 show working capabilities
Moves You Along the Learning
Curve Faster
proach. You look at actual signals at
places you select in the systems chain.
Then you can change the modulation
of the program. Using your "meas- You would probably have to read format, signal-to-noise ratio, or filter
uring probe pointer" and handy set several books and articles to get the alpha value, and compare the signals.
of equipment displays, you can view equivalent information presented in A series of lab exercises guide you to
Pub. NO. 5952-0122 WWW.HPARCHIVE.COM @ Hewlett-Packard 1985
Real-world concerns
System Block - Multipath fade
Diogrom: - High power amplifier
nonlinearities f-l
Probe Pointer: - Advanced design mode
rn Experimental exercise
System Signal - Probability of error [P(e)l vs.
Displays; SNR
- P(e) vs. filter bandwidth
- Multipath and " M curves
- Distortion caused by HPA
Lab Notebook
nonlinearities
Pages:
rn Additional information
System - Theory of I-&
Modulation Type`OPSK SNR. 4068 Filter Alpha' 3
Porameters modulation/demodulation
and Key List
l-qIflI .
J 1 - Nyquist filters
L
- Bandwidth
Figure 1. 10 Tutor system overview. Using Hewlett-Packard's 10 Tutor is like walking
- - - FCC
through a complete digital microwave communications system with a handy set of test
equipment and displays.
Ordering Information
explore the effects of degraded signal- Subjects Covered Include: The HP Model number of I-& Tutor
to-noise ratios, filter coefficient vari- is HP 11736A and the U.S. list price
ations, and nonlinearities on system rn Understanding fundamental
is $95.00. You will need an HP 9000
error rates. concepts
Model 216A or Model 236A computer
- Phase and magnitude with 640K bytes of memory, or the
Even if you are only a casual com- - Practical digital modulation Model 236C with 896K bytes. For
puter user, you will quickly feel com-
fortable operating the program after
techniques
- BPSK
more information order flyer number /7
5954-6370 from your local Hewlett-
followingthe step-by-step instructions - QPSK Packard sales office listed in your
in the manual. You can easily work - 16QAM telephone white pages. 0
I-& Tutor into your busy schedule. - Offset QPSK
The entire program takes about eight - Offset 16QAM
hours and can be spread over as - Understanding the system
many sessions as you need. block diagram
Q
Clean and
tight cross- Q or I
over points vs. time
indicate error- eye diagram
free transmission
/ \ Time
/
Clock Instant
Transition Period
Vector * ~T * I Constellation
I
Diagram Diagram
* I .
'3
Figure 2. This is a constellation display.
You can examine the effects of system non- Figure 3. Learn by exploring. You are able to change how the system operates and
linearities, such as amplitude compression immediately view the effects of those changes, such as degraded signal-to noise ratios
distortion, on the I and 0 vector diagrams. causing a closing of the "eye."
2 BENCH BRIEFS JUNE/AUGUST 1985 WWW.HPARCHIVE.COM
calibration is directly traceable to traceable to NBS through the diILLGL1-
the National Bureau of Standards at sions of a sliding load and offset
Offers MiI Iimeter every standard frequency that NBS short.
maintains. At the other frequencies,
wave Recalibration the calibration is indirectly traceable The following table provides a sum-
to physical NBS standards; that is, mary of HP's current millimeter wave
Ed Cantrell, the reflection coefficient is indirectly calibration capabilites. 0
HP Stanford Park Diu.
Q-band U-band
(33 to 50 GHz) (40 to 60 GHz)
Hewlett-Packard can now offer pre- Estimated No. of Price Estimated No. of Price
cision recalibration services for our Accuracy Points (US. $) Accuracy Points (US.$)
new Q-band (33-50 GHz) and U- Cal-factor 3.9% RSS 40 GHz 18 $1 50 Not currently
Band (40-60 GHz) products, of power (6.8% W.C. 40 GHz) available
including: sensor 5.5% RSS 50 GHz
(9.3% W.C. 50 GHz)
- Variable and fixed attenuators
Reflection 0.004 + 0.017rD 51 $100 0.004 + 0.02rD 51 $115
- Couplers coefficient
- Detectors Attenuation 0.04 + 0.03/10 dB 51 $150 0.05 + 0.03/10 dB 51 $175
Per Per
- Sliding shorts attn. attn.
setting setting
- Isolators
Directivity Limited by measuring 51 $300 Limited by measuring 51 $350
of single system effective system effective
You will receive a full report of the coupler directivity of 46 dB directivity of 46 dB
calibration parameters as a function
of frequency, including uncertainties, Note: Calibration factor, attenuation a n d directivity calibration reports also include reflection
at every 1 GHz. HP millimeter wave coefficient.
Service notes from HP relating to
personal safety and possible equip-
ment damage are of vital impor-
tance to our customers. To make you
more aware of these important Oscilloscopes --
notes, they are printed on paper
with a red border, and the service A mechanical hazard may exist on
note number has a "-S' suffix. In these oscilloscopes. As you are car-
order to make you immediately rying the unit, the strap handle may
aware of any potential safety prob- break allowing the instrument to fall
lems, we are highlighting safety- on your foot.
related service notes here with a
brief description of each problem. Refer to the following photographs to
Also, in order to draw your atten- see if your oscilloscope requires mod-
tion to safety-related service notes ification. If your oscilloscope requires
the new large-headed handle retain- Old handle New handle
on the service note order form at the
fastener screw fastener screw
back of Bench Briefs, each appropri- ing screws, you can order the follow- HP P/N 00182-22401
ate number is highlighted by being ing kit from Hewlett-Packard free of
printed in color. charge. Note that the kit is available
at no charge until January 1, 1986. Order HP Part No. 00812-69505from
Address your request for the kit to
the address listed below. Please indi- HEWLETT-PACKARD CO.
cate the instrument model and serial P.O. Box 2197
number for all instruments requiring Colorado Springs, CO 80901
this safety modification. Attn. Product Assurance Mgr. 0
WWW.HPARCHIVE.COM JUNE/AUGUST 1985 BENCH BRIEFS 3
r.
Using Fiber Optics to Transmit a
Frequency Standard
I qL
Brett Frymire, NP Opto-
Communications Diu.
Are you considering installing a fre-
quency standard to all your repair
benches? You may want to think
about using fiber optic cable in place Transmitter HFBR-1402/4
of coax. Some of fiber optic's advan-
tages are:
The cable is smaller and easier to
*"
.
handle than coax.
Fiber optic cable
HFBR-3000
Does not g e n e r a t e electrical
interference. SMA connector
Receiver HFBR-2404
rn I t is not affected by electrical
interference.
Data security (cannot be easily
This is the proposed system that uses distribution amplifier is too far ( >5
monitored).
fiber optic links. (A fiber optic link meters), another entire fiber optic
consists of a transmitter, the fiber link could be used to tie these benches
Depending on the specific frequency
cable, and the receiver, all of which to their distribution amplifier. In any
(for example, 10 MHz), fiber and coax
replaces the wire cable.) Again, there case, this article describes the fiber
have similar electrical performance.
However, at higher frequencies, spe-
are many different and possible var-
iations of the same system. For ex-
optic link shown in Figure 2. ,?
cifically 100 MHz, the fiber system
ample, if the distance between the The criteria for our system is that it
can transmit data over longer dis-
four benches and their corresponding must be able to operate from 1 MHz
tances than can be done with a coax
system. Another factor that affects
I
performance is the environment in
which the system is located. An elec-
trically noisy environment affects
coax but not fiber.
This article will describe using fiber
optics to transmit frequency stand-
ards of 1 MHz, 5 MHz, and 10 MHz
with the standard HP components
shown i n the photograph. If your
system matches the example used in
this article, all that is required is to
build the circuits described and then
install the system. If you want to
make changes, the formulas, dia-
grams and schematics are supplied
that will allow you to build a custom
system for your office.
Before describing the fiber optic link,
let's look at a typical block diagram
of a system that uses coax (see Figure 7
1).Even if your system requirements
are slightly different, the basic idea
is the same. Now look at Figure 2. Figure 1. Block diagram of typical frequency standard distribution scheme using coax.
4 BENCH BRIEFS JUNE/AUGUST 1985
WWW.HPARCHIVE.COM
5 and carry the signal for
tre distance (1meter to 1 r 1
). The Hewlett-Packard FREQUENCY DISTRIBUTION
STANDARD AMPLIFIER
;s that meet these require-
I 1 I I
inexpensive and easy to
d are listed below:
itter-HFBR-1402/4
m Receiver-HFBR-2404 L` RECEIVER BENCH
b Cable-HFBR-3000 BENCH
As mentioned before, the proposed
system consists of three parts; the BENCH
transmitter, which is a light emitting
I"
diode (LED) with support circuitry,
the fiber cable, which propagates the FIBER OPTIC BENCH
light from the transmitter t o the RECEIVER
receiver, and the receiver, which is a BENCH
light sensitive photodiode with sup-
BENCH
port circuitry.
J
Transmitter
!
? " 4
.
/
3 I.
The first part of the link, the trans-
mitter, consists of a drive circuit that
current modulates the LED. The cir-
r
Figure 2. Block diagram of same frequency standard distribution scheme as shown in
cuit shown in Figure 3 utilizes inde- Figure 1 only using fiber optics.
pendent resistors (Rm and Rq) to
/
select the drive current for modula-
tion (Ifm) and the quiescent current
for the dc current level of the LED +8.5V
(Ifq). Note that the drive current sets
the amount of optical power that the
diode emits and that the LED should
operate from maximum peak current
to just above extinction (zero optical
power). Quiescent current refers to
the dc operating point that biases the
. LED in the center of its operating
range (just like a transistor's Q point).
Note the network of the three diodes
. (CR1-3)and the 2N2905 (Ql) transis-
tor. This network sets the voltage at
the LED to the center of the range
between Vcc and ground. This is to
avoid any clipping of the signal in
the LH0002. Modify the circuit as
shown in Figure 4 and the same
signal can be transmitted down two
fibers instead of one.
r
Now, the two currents, the Ifq and
Ifm, must be calculated. Referring to L--+ +8.5V
the values shown in Table 1,we see
that the maximum peak operating
current for the LED is 70 mA. The
recommended operating value that Figure 3. Fiber optic transmitter.
JUNE/AUGUST 1985 BENCH BRIEFS 5
WWW.HPARCHIVE.COM
Table 1. HFBR-1402/1404 Transmitter
Absolute Maximum Ratings
~~
Parameter Symbol Min. Max. Unit
Storage
Ts -55 +85 "C
Temperature
Operating
Temperature TA - 40 +85 "C
Lead Temp. +260 "C
Soldering
Cycle Time 10 sec
Forward Peak lFPK 70 mA
Input
Current Avg. ~FAV 70 mA
Reverse Input
Voltage VBR 1.8 v
we use, will be 60 mA. To allow for
full excursion of the drive current,
the quiescent point is set a t the
midpoint, 30 mA. With the Ifq deter-
mined at 30 mA, calculate Rq with
the formula shown in Table 2a. For
our circuit, the value of Rq is [8.5v-
2v-2.4~]/30 mA = -150 ohms. With
this value of Rq the modulation cur-
rent (controlled by Rm) can be set
with the formula shown in Table 2b.
Set the drive current for a swing of
28 mA. This provides a guard band
of 2 mA (30 mA-28 mA) to avoid
clipping of the signal that would Figure 4. Alternate fiber optic transmitter with two optical ports.
occur if the LED turned completely
off. Substitute the numbers for the For this article, we used 100/140 pm Table 3. HFBR-2404 Receiver
variables, Rm = 1 5 / 2 8 mA = -56 Absolute Maximum Ratings
graded index fiber cable (HFBR-
ohms. Depending on the tolerance of
~~ ~
3000). HFBR-3000 can be ordered in Parameter Symbol Min. Max. Unit
the resistors and the devices involved, the required lengths with the connec- Storage
the guard band can be wider or T, -55 +85 "C
tors already installed or you can Temperature
narrower. These values of Rq (150
make up your own cables using a Operating
ohms) and Rm (56 ohms) are typical connector kit and a spool of cable. Temperature
TA -40 +85 "C
values and can be used for this circuit. Because of the complexity of install- Lead Temp. +260 "C
ing connectors (18 steps are involved Soldering
Cycle Time 10 sec
Table 2. Formulas that require special tools) and if only
a few cables are needed, it will be Signal Pin
Voltage VSIGNAL -0.5 1 V
less expensive to order pre-made ca-
(b) Rm = Vp/lfm Vp = V,, p-pI2 bles in the desired lengths. Supply Voltage Vcc -0.5 7.0 V
Receiver
Fiber Cable optical signal to a voltage, which is
The final part of the link, is the bufferred with an internal preampli-
The second part of the link, the fiber receiver as shown in Figure 5. The fier to the video amplifer (LM733),
cable, needs to be made to the lengths receiver uses a video amplifier with which amplifies the signal to the
needed. There are several types of automatic gain control (AGC) so that desired levels. Note that the LM733
cable available with varing fiber di- fiber distances of 1 metre t o 1.5 has complimentary outputs. Add an-
ameter cores. (For more information
on fiber and connectors refer to Tech
kilometres can be used without ad-
justing the transmitter or the receiver
other emitter follower stage and two
outputs can be used from one receiver
1
Brief 101 and 102 available from circuit. The HFBR-2404 receiver (a circuit. The gain of LM733 is con-
Hewlett-Packard as HP publication partial datasheet of the HFBR-2404 trolled by an AGC loop consisting of
number 5954-1004 and 5954-1011.) is shown in Table 3) converts the a peak detector, an OP Amp (LF3511,
6 BENCH BRIEFS JUNE/AUGUST 1985 WWW.HPARCHIVE.COM
Figure 5. Fiber optic receiver.
and the FET, 2N4416, which will Distributing frequency standards is
maintain a constant output within only one of the many uses of fiber
the range of the AGC loop. This optics. This particular circuit, with
constant output level depends on the some modifications, also work for
reference level established by the base-band video applications. In ad-
divider network of R7 and R8.Differ- dition to these analog applications,
ent levels of the output signal would there are still many digital applica-
require this network to be adjusted. tions, which include local area net-
"he last part of the circuit is the works, PBXs and many more.0
emitter follower, 2N5179, which al-
lows the circuit to drive into a 50
ohm load.
Transmitter Parts List Receiver Parts List
Reference
Designators JDEC # HP # JDEC # HP #
Active parts Active Parts
u1 LH0002 1820-0224 U1 LM733 1820-0064 Brett Frymire, who joined
u2 LM741 1826-0271 U2 LF351 1820-0667 Hewlett-Packard in February
Q1 2N2905 1853-0314 Q1 2N5179 1854-0345
CR1-3 FD777 1901 -01 79 CR1 1 N4150 1901-1098 1981, works as an Application
CR4 HFBR-1402 HFBR-1402 HFBR-2404 HFBR-2404 Technician at HP Opto-Communi-
cations Division. His primary du-
Passive Parts Passive Parts
ties consist of breadboarding and
C1-3 .1 ufd 0160-0576 C1, 3-10 .1 ufd 01 60-0176
c4 4.7ufd 0180-2683 C2 1ufd 0160-0127
testing of circuits that involve fiber
optics and optocouplers. Pre-
R1 51 ohms 0683-5105 R1 100 ohms 0683-1015
R2, 3 1 Kohm 0683-1025 R2, 3 2.2 Kohms 0683-2225 vious to his present position, Brett
R4 3.9 Kohm 0683-3925 R4 22 Kohms 0683-2235 worked at Instrument Suppott Di-
Rm, Rq select R5, 6 1 Mohms 0683-1055 vision repairing surveying gear,
components R7 18 Kohms 0683-1835 counters and various other
R8 3.3 Kohms 0683-3325
R9 1 Kohms 0683-1025
equipment.
R10 10 Kohms 0683-1035
WWW.HPARCHIVE.COM JUNE/AUGUST 1985 BENCH BRIEFS 7
I?
AS we p r e v ~ o u s ~ yL ~ L ~111 L I I ~ J ~ I I U -
S U ~
ary-February issue of Bench Briefs,
Hewlett-Packard is designing new
products with full metrics. As those
products are introduced to the mar-
ket, and older products are retired,
the line will naturally become more
metric.
Starting early this year, HP began
shipping instruments that use the so-
called System I1 cabinet configuration
with metric-threaded fasteners in the
frame parts. Brackets and cabinet-
joining hardware will attach with
metric screws although the internal
structure will remain standard inch-
threaded fasteners (in the older
instruments).
Instruments with these mixed inch-
`threadedlmetric-threadedconfigura-
tions will be identified with labels
inside each top and bottom cover.
There should also be a notification
label attached to the rear panel of
each instrument. And as the updates
become available, the operating and
service manual will carry a notifica-
tion addendum sheet. The frame parts
themselves will have either an "M'
designator or the word "metric" cast
into a visible spot for identification
as shown in the accompanying pho-
tographs. These photographs show
how you can identify the new cabinets Front bezel casting has metric mark under trim strip on the right corner.
that now use the metric fasteners for
attaching cabinet accessories. To pre-
vent damage and to preserve the
structural integrity of the cabinets,
it is vitally important to use the
proper fasteners.
As an aid to our customers, HP has
modified most of the cabinet accessory
kits t o include both the metric-
threaded and inch-threaded fasteners.
These cabinet accessory kits are
shown on pages 682-685 of the 1985
HP Catalog (HP No. 5954-0168). The
accompanying list shows the new kit
part numbers that contain both inch-
threaded and metric-threaded
fasteners. 0 Rear bezel casting has metric mark alongside the top cover-attaching screw.
8 BENCH BRIEFS JUNE/AUGUST 1985
WWW.HPARCHIVE.COM
Sidestrut castings have small M mark
embossed in cast dimple on one end.
New Kit Number New Kit Number
Old Kit Number (contains both Old Kit Number (contains both
(now metric and inch (now metric and inch
obsoleted) fasteners) Description obsoleted) fasteners) Description
5061-0057 5061-9657 Rack Adapter 0098 9698 Support Shelf
0058 9658 Rack Adapter 0099 9699 Lock-Foot Kit
0060 9660 Rack Adapter 2001 9701 Bail Handle
0061 9661 Rack Adapter 2002 9702 Bail Handle
0066 9666 Rack Adapter 2003 9703 Bail Handle
0067 9667 Rack Adapter 2009 9709 Rear Standoff Feet
0071 9671 Rack Adapter 2069 9769 Rack FlangesiPrevious Handles
0072 9672 Rack Adapter 2070 9770 Rack FlangesiPrevious Handles
0073 9673 Rack Adapter 2071 9771 Rack FlangesiPrevious Handles
0074 9674 Rack Flange 2072 9772 Rack FlangesiPrevious Handles
0075 9675 Rack FlangeiHandles 2073 9773 Rack FlangesiPrevious Handles
0076 9676 Rack Flange 2074 9774 Rack FlangesiPrevious Handles
0077 9677 Rack Flange 2075 9775 Rack FlangesiPrevious Handles
0078 9678 Rack Flange
0079 9679 Rack Flange 1494-0023 1494-0061 Rack End Brackets
0080 9680 Rack Flange 0042 0064 Rack End Brackets
0081 9681 Rack Flange
0082 9682 Rack FlangeiHandles
9683 Rack FlangeiHandles
These following slide mount kits will maintain both an
0083
0084 9684 Rack FlangeiHandles inch-threaded version and a metric-threaded version
0085 9685 Rack FlangeiHandles because the fastening screws themselves require that the
0086 9686 Rack FlangeiHandles
Rack FlangeiHandles
slide mount sheet metal be countersunk differently for
0087 9687
0088 9688 Handles the two fasteners.
0089 9689 Handles
0090 9690 Handles Old Kit Number New Kit Number
0091 9691 Handles (inch fasteners) (metric fasteners) Description
0092 9692 Handles
0093 9693 Handles 1494-0016 1494-0058 Slide Kit
0094 9694 Lock Link Kit 0017 0059 Slide Kit
* 0095 9695 Cord Wrap Feet 0018 0060 Slide Kit
0096 9696 Support Shelf 0025 0062 Slide Kit
0097 9697 Support Shelf 0026 0063 Slide Kit
They're free! Use the order form at the rear of
Bench Briefs to order, free of charge,
Here's the latest listing of service individual service notes document-
notes. They recommend modifica- ing several instruments.
tions to Hewlett-Packard instru-
Meed Any Service m e n t s t o increase r e l i a b i l i t y ,
improve performance, o r extend
If you would like to purchase large
quantities of service notes covering
Notes? their usefulness. a wide range of instruments, or if
you desire a complete history of all HP 1345A OPTION 704 DIGITAL DISPLAY HP 3764A DIGITAL TRAN
service notes documenting a l l WITH MEMORY ANALYZER
1345A704-16. Serials 2501A and below. Modification 3764A-5A. Serials 24191100257 and LU,.. I.VII lvlcILllr
changes to your instruments, Hew- to prevent erratic/intermittent display. memory protection.
lett-Packard offers a microfiche li- HP 1345A DIGITAL DISPLAY HP 3776A/B PCM TERMINAL TEST SET
brary for a modest, one time charge. 1345A-3A. Serials 2515A and below. Model changes 3776A-21A. All serials. 3776 test programs data car-
There is also a microfiche subscrip- and compatibility. tridge (HP part number 03776-10001) rnodifica-
tions-update to Rev C.
tion service available that automat- HP 1630A/D LOGIC ANALYZER 3776A-22. Serials 2444U00292 and below. Firmware
ically updates the library on a 1630A/D-6. 1630A serials prefix 2511A, 251 1G and revision to change generated idle code.
2507J. 1630D serials 2511A, 2512G and 2507J. 37766-21A. All serials. 3776 test programs data car-
quarterly schedule. Recommended PROM replacement to correct tridge (HP part number 03776-10001) modifica-
firmware. tions-update to Rev C.
37766-22. Serials 24371100742 and below. Modification
The part numbers for the service HP 1631A/D LOGIC ANALYZER to prevent measurement inaccuracies in timeslot
note microfiche library and sub- 1631A/D-lA. 1631A serials 2509A and below. 1631D 24.
serials 2510A and below. Recommended PROM 37766-23. Serials 2437U00642 to 00801. Preferred
scription service are: replacement to correct firmware. replacement for PROMS A14U13 and A14U23.
HP 3779AlB PRIMARY MULTIPLEX
Library- 5951-6511 HP 1727A OSCILLOSCOPE ANALYZER
1727A-3. Serials 2452A01225 and below. Potential 3779A-39. All serials. Instructions for retrofitting the
Subscription service- 5951-6517 power transformer failure due to capacitor shorting. 3779C/D A8 assembly to the 3779A.
37796-42. All serials. Instructions for retrofitting the
HP 3061A/3062A CIRCUIT TEST SYSTEM 3779C/D A8 assembly to the 37796.
Contact your local HP Sales Office 3061A/3062A-11. All serials. Product support package
for ordering information. descriptions. HP 3779C/D PRIMARY MULTIPLEX
3061A/3062A-12. All serials. Configuration/confir- ANALYZER
rnation/diagnosticssoftware. 3779'2-22A. Serials 00458 and below. Preferred re-
placement for assemblies A23, A24, A25 and A26.
HP 182A/C/T OSCILLOSCOPE HP 3065 BOARD TEST SYSTEM 3779D-26A. Serials 00438 and below. Preferred re-
182A-5-S.All serials. Possible hazard due to instrument 3065-20. All serials. Repair of the external vacuum placement for assemblies A23, A24, A25 and A26.
handle breakage. module part number 03085-80602.
182C-5-5. All serials. Possible hazard due to instrument 3065-26. All serials. Test and modification to solve HP 3780A PATTERN GENERATOR/ERROR
handle breakage. intermittant digital cal failures. DETECTOR
182T-4-S. Serials 2010A011380 and below. Possible 3780A-176. All serials. Retrofit kit instructions for
hazard due to instrument handle breakage. option 100.
HP 3325A SYNTHESIZER/FUNCTION
HP 334A DISTORTION ANALYZER GENERATOR 3780A-18A. Serials 1804U00523 and below. Retrofit
3325A-16A. Serials 1748A16400 and below. 30 MHz kit to incorporate equaliser and attenuator in existing
334-106. Serials 1145A05870 and be- option 100.
low. Recommended replacements for the A4 R.F. crystal change to prevent intermittent oscillator
Detector assembly. failures.
HP 3785A/B JITTER GENERATOR 81
HP 3336A/B/C SYNTHESIZER/LEVEL RECEIVER
HP 355C/D VHF ATTENUATOR
GENERATOR 3785A-15. Serials 2409U and below. Recornmended
355C-1. Serials 1203A36850 and below. New atten-
3336AIBIC-15A 3336Aserials 1930A01115andbelow replacement for the rotory pulse generator.
uation dial. 37856-14. Serials 2408U and below. Recommended
355D-1. Serials 1204A39325 and below. New atten- 33366 serials 1931A02240 and below 3336C serials
replacement for the rotory pulse generator.
uation dial. 1932A00850 and below 30 MHz crystal change to
prevent intermittent oscillator failures
HP 1200A OSCILLOSCOPE HP 4935A TRANSMISSION IMPAIRMENT
TEST SET
1200A-8-S. All serials. Possible hazard due to instru- HP 3455A DIGITAL VOLTMETER
4935A-12. All serials (with options 001 and 003). Mod-
ment handle breakage. 3455A-24 Senals 2519 and above and 1622 and below ification to prevent fuse blowing.
System II cabinets inchlmetric conversion
HP 1201A OSCILLOSCOPE
HP 4951A PROTOCOL ANALYZER
1201A-10-S. All serials. Possible hazard due to instru- HP 3456A DIGITAL VOLTMETER
ment handle breakage. 4951 A-EA. Serials 2443A2722 and below. Improved
3456A-20 Serials 2512 and above and 2201 and below carrying handle.
System II cabinets inchlmetric conversion 4951A-11. Serials 2508A to 2508A03900 and all HP
HP 1202A OSCILLOSCOPE
4951 A's that have been updated to Software Rev.
1202A-4-5. All serials. Possible hazard due to instru- HP 3478A DIGITAL MULTIMETER 2.0.Notification of Software Revision 2.1.
ment handle breakage. 4951A-12. Serials 2508A03891 and below. Modification
3478A-5 Serials 2520 and above and 2301 and below
System II cabinets inchlmetric conversion to correct intermittent "SERVO ERROR' message.
HP 1205A OSCILLOSCOPE 4951A-13. Serials 2508A and below. Modification to
1205A-5-S. All serials. Possible hazard due to instru- prevent BERT errors.
ment handle breakage. HP 3497A DATA ACQUISITION AND
CONTROL UNIT
3497A-19. All serials. 9825A/B CARDVER program HP 4953A PROTOCOL ANALYZER
HP 1206A OSCILLOSCOPE
error. 4953A-1 A. Serials prior to 2441A00326. Modification
1206A-4-S. All serials. Possible hazard due to instru- to prevent breaking the. handle mounting rails.
ment handle breakage. 3497A-20. Serials 2222A08697 through 2448A16174.
Modification to replace missing decade address 4953A-5. Serials prior to 2516A002576. AC line switch
change trace. replacement.
HP 1207A OSCILLOSCOPE
1207A-7-S. All serials. Possible hazard due to instru- 3497A-22. All serials. Getting DC1 handshaking to HP 4955A PROTOCOL ANALYZER
ment handle breakage. work for the RS232 option when a 44420A internal 4955A-9. Serials prior to 2507A. Notification of firmware
DVM is not present. revision 2.0 upgrade.
HP 1208A DISPLAY/VARIABLE 4955A-10. Serials 2404A and below. Preferred re-
PERSISTANCE SCOPE HP 3708A NOISE AND INTERFERENCE placement for the HP P/N 04955-62617 trap machine
1208A-144. All serials. Possible hazard due to instru- TEST SET kit.
ment handle breakage. 3708A-1. Serials 24141100127 and below. Preferred HP 5180A WAVEFORM RECORDER
replacement for A201C1 capacitor. 5180A-20. Serials 2448AO1010 and below. Modification
HP 1215A OSCILLOSCOPE to improve histogram test results.
1215A-3-S. All serials. Possible hazard due to instru- HP 3746A SELECTIVE LEVEL MEASURING 5180A-21. Serials 2436A00990 and below with the
ment handle breakage. SET following exceptions: 2324A00700, 2404A00860,
3746A-13A. Serials2314U00352 and below. Retrofitting 2404A00861, 2404A00865, 2404A00872,
HP 1217A OSCILLOSCOPE high level search (hot tone) facility. 2404A00875, 2404A00877, 2404A00878,
1217A-4-S. All serials. Possible hazard due to instru- 3746A-15A. Serials 241OU00602 and below. Inspection 2404A00911, 2404A00957, 2404A00975. Modifi-
ment handle breakage. for short circuit between motherboard and casting. cation to eliminate mistrigger.
10 BENCH BRIEFS JUNE/AUGUST 1985
WWW.HPARCHIVE.COM
HP 5182A WAVEFORM HP 6942A MULTIPROGRAMMER HP 10752A/B/C MATERIAL
RECORDER/GENERATOR 6942A-11. Serials 2433A and below. Modificationt to TEMPERATURE SENSOR
5182A-1. Serials 2448A00315 and below. Modification guarantee proper operation of the clock generator 10752A/B/C-1. All prefix serials. Recommended
7 to fix DMA problems with "auto stop" and chop
mode data records.
5182A-2. Serials 2442A00300 and below. Modification
circuit.
HP 8112A PULSE GENERATOR 50 MHz
replacements.
HP 11729A/B LOW NOISE DOWN
to improve histogram test results. 8112A-2. Serials 2343G02255 and below. Modification CONVERTER
to prevent blown fuses in the output amplifier 11729A/B-1,All series. Recommended IF amplifier as-
HP 5340A MICROWAVE FREQUENCY supplies. sembly replacement.
COUNTER
HP 8116A PULSE/FUNCTION GENERATOR HP 14751A CAT PROGRAMMING
5340A-21A. All serials. Option 006 microwave limiter PACKAGE
retrofit.
50 MHz
81 16A-3. Serials 2334603645 and below and 14751A-1. All serials. Corrections to the software code
2334A01585 and below. Modification to prevent in the 69791A Memory Card Test routine.
HP 5342A MICROWAVE FREQUENCY
COUNTER blown fuses in the output amplifier supplies.
8116A-4. Serials 2124G00194, 189, 180, 175 and be- HP 37212A MODEM
5342A-42A. Serials 2440A09236 and below. Modifi-
low. Piggy-back board modification for additional 37212A-1. All serials. Modification to prevent invalid
cation to prevent high frequency miscount.
shaper stage adjustments. remote digital loopback initiation.
HP 5343A MICROWAVE FREQUENCY HP 8170A LOGIC PATTERN GENERATOR HP 54200A/D DIGITIZING OSCILLOSCOPE
COUNTER
8170A-5. Serials 2036G01395 and below. Improved 54200A/D-l,54200A/D serials 2445A only. Recom-
534A-20A. Serials 2424A01674 and below. Modification temperature compensation of A7 U6. mended PROM replacementto correct firmware.
to prevent high frequency miscount.
HP 8340A SYNTHESIZED SWEEPER HP 59401A BUS SYSTEM ANALYZER
HP 5345A ELECTRONIC COUNTER 8340A-5. Serials 2409A and below. Modifications to 59401A-1. Serials 2512 and above, and serials 1914
5345A-28. Serials 2420A10310 and below. Instructions incorporate A14 power amplifier replacement kit. and below. System II cabinets inchlmetric conversion.
to update the front end for an HP 5345A option 012.
5345A-29. Serials 2420A10310 and below. Instructions HP 8447C/D/E/F RF AMPLIFIER
to update the front end for either a standard HP
HP 64000 LOGIC DEVELOPMENT SYSTEM
8447C-1A. Serials 1937A and below. Modification kit 64000-01.Service note index.
5345A or an HP 5345A option 011 (original version for replacement amplifier.
front end). 8447D-4/8447E-4/8447F-4. All serials. Prevention of
5345A-30. Serials 2420A10310 and below. Instructions 64100A DEVELOPMENT STATION
amplifier damage due to electrostatic discharge. 64100A-15. Various serial numbers. Misloadedjumper
to retrofit a standard HP 5345A to option 012 and
to update the front end circuitry. causes PROM programmer softkey to not appear.
HP 8555A SPECTRUM ANALYZER
5345A-31. Serials 2420 and below. Modification for 8555A-6C. All serials. Instructionsfor changing A3 YIG HP 64110A DEVELOPMENT STATION
option 011 computer dump mode compatibility with oscillator assembly. 6411OA-9. Serial numbers listed in body of the note.
Series 200 computers. Display intensity problem fixed by resistor change.
5345A-32. Serials 2420 and below. Modification for HP 8557A SPECTRUM ANALYZER
option 012 computer dump mode compatibility with HP 64224A 80186 EMULATOR
8557A-8A. Serials 2106A and below. Front panel retrofit
Series 200 computers. SUBSYSTEM
kit.
5345A-33. All serials. Modification to alleviate crosstalk 8557A-13. Serials 2229A and below. Recommended 64224A-1. 80186 emulator pod board repair number
/7 from channel A to channel 8.
5345A-34. All serials. Use a 10 MHz filter to prevent
5345A miScount due to synthesized generators.
first LO and frequency control assembly replacement
kit.
2503A-00410 and below, and 2503A-00426 thru
00431. Emulator POD RFI end shield change.
5345A-35. All serials. How to prevent 5345A miscounts HP 85588 SPECTRUM ANALYZER HP 64225A 80188 EMULATOR
in TI and ratio modes. SUBSYSTEM
5345A-36. Serials 2420A10311 and above. Incorrect 85588-33. Serials 2436A10965 and below. Video filter
artwork on Revision A of A20 filter assembly (HP potentiometer replacement. 64225A-1,80188 emulator pod board repair number
2448A-00130 and below, and 2448A-00133, 134.
P/N 05345-60130).
HP 8565A SPECTRUM ANALYZER Emulator POD RFI end shield change.
8565A-21. All serials. A16 sweep generator board
HP 5510A AUTOMATIC COMPENSATOR replacement. HP 64249A 68010 EMULATOR
5510A-1. First serial number 2520A03686. A9 control SUBSYSTEM
board assembly IC change. HP 8566A/B SPECTRUM ANALYZER 64249A-1,68010 emulator pod board repair number
85668-1. Serials 2503A and below. Rack mounting 2412A-00250 and below. Emulator POD RFI end
HP 5517A/18A LASER HEADS with slides (option 010) English System II cabinet shield change.
5517A/18A-1. All serials. Repair of sampler assembly. parts.
5517A/18A-2. Serials 2502A01011 and above. Notice 85668-2. Serials 2516A and above. Instructions for HP 64292A NSC8OO EMULATOR
of change from 5518A laser tube to 5517A laser rack mounting slides (option 010) on metric System SUBSYSTEM
tube in 5518A laser heads. II cabinets. 64292A-2. NSC800 emulator pod board repair number
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