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rise in the wire. Obviously, a wire is Average responding ac meters are
insensitive t o the ac signal's inexpensive and are fine for measur-
geometry. ing sine waves where high accuracy
is not required. But for non-
One limitation to this technique is sinusoids, only a true rms respond-
that ambient temperature adds to ing ac meter will do.
J
J""" - the heat produced by the ac signal.
To overcome this, a second, carefully
@o@l*o
a!"?
001'. !Os
I BOdB) t 60 dB1 I 40dBl
10""
( 2048)
matched thermocouple is placed in
AMOUNT OF HARMONICDISTORTION
series with the measuring ther-
Figure 3. Error produced when a mocouple (Figure 5 ) . The two ther-
average responding ac meter is used mocouples a r e connected with
to read the fundamental.
lses originating at
THERMOCOUPLE the zero base line contain a dc
Trying to measure a square wave component. Only a true rms
with a n average responding ac responding ac meter capable of
meter is next to hopeless. For exam- +
measuring ac dc can determine the
ple, the square wave in Figure 4 has true rms value o such a signal.
f
a peak-to-peak amplitude of 2V.The
heating or rms value is 1V. This
voltage as measured by an average
responding voltmeter would be 1.1V.
Average responding ac meters most DCFEEDBACK
commonly use a full wave rectifier I n the last issue of Bench Briefs the
Capacitor article had two typesetting er-
bridge which would produce an out- rors that affected readability and sense.
put of 1V.The metering circuit adds uses dual matched thermocouples O n page 5 , the formula under step c
a n 11% calibration factor to produce operated in opposition to cancel the .
should read f = -And on page 5 ,
effects of ambient temperature and to 2s VLC
a correct reading for a sine wave produce a linear output. the last line i n the middle column
input. The calibration factor makes should be moved to the space between
the bottom of Figure 9 and the text that
the reading too high and a t this has "allowed" as the first word. The
point, everything may seem bleak. sentence would read - "Zf the amplified
polarities opposing to offset changes signal current was also allowed to flow
in R1, the dc bias "
G
in ambient temperature and also to
1 1 l V OR 11% HIGH
remove any nonlinearities. Unfor- We also received a letter
tunately, the fine heater wire is dif- Company concerning m y example 1.0
TRUE RMS farad capacitor.
VALUE = 1 OV ficult to protect from overvoltage.
Protection circuitry combined with
the cost of the matched ther-
mocouples makes this type of true
rms responding ac meter expensive. 1979 issue of the "Bench Briefs" i s
Figure 4. Average responding ac However, you get what you pay for grossly distorted by the use of an air
meters will read 11% higher than the dielectric and super-wide plate spacing.
because the true rms ac meter can
I true rms value of a symmetrical
square wave.
accurately measure a wide variety of
wave shapes and pulses.
Using that same criteria, even a one pf.
capacitor would have plates of over
three square feet each.
In reality, one farad capacitors are
Don't Give Up For a pulse originating at the zero available (with low working voltages)
base line (Figure 6), the dc compo- in sizes approximating that of a Coors
beer can.
If you are trying to measure the true nent will be ignored when measured
rms value of something other than a by most true rms meters because Yours truly,
sine wave, you need a true rms ac they are capacitively coupled. There
meter. The simplest type puts the ac are a few true rms responding me- William Keys
signal into a fine heater wire. A ters, however, that do have a dc- Supervisor,
thermocouple in close proximity to coupled mode and are able to meas- Electronics and Controls
the wire measures the temperature ure "ac + dc."
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CONTENT DATES LOCATION TUITION COORDINATOR
Logic Analyzers
Logic State Analyzer March 10 - 12 Colorado Springs Division $300/student Jerry Lopez
Maintenance Models 1900 Garden of the Gods Road
1600A/1607 Colorado Springs, CO 80907
(303) 598-1900
Model 1610A/B April 21 - 23 Colorado Springs Division $300/student Jerry Lopez
October 22 - 24
Model 1611A March 12 - 14 Colorado Springs Division $300/student Jerry Lopez
October 1 3 - 15
Model 1615A April 16 - 18 Colorado Springs Division $300/student Jerry Lopez
October 15 - 17
Model 1640A April 14 - 16 Colorado Springs Division $300/student Jerry Lopez
October 20 - 22
Microcomputer Develop- February 25 - March 7 Colorado Springs Division $1,25O/student Jerry Lopez
ment System Model 64000 June 16 - 27
(excludes Disc & 2608 November 10 -21
Printer)
Scopes and Displays
Models 1338A/1350A March 20 - 21 Colorado Springs Division $250/student Dick Browne
(order HP no. 5955-5034) October 9 - 10
Models 1715A/1725A -March 17 - 19 Colorado Springs Division $300/student Dick Browne
(order HP no. 5955-4146) October 6 - 9
Models 1740A/1741A/ -
March 10 1 3 Colorado Springs Division $350/student Dick Browne
1742/1744A September 29 -
(order HP no. 5955-4147) October 2
Automatic Test
Circuit Test Systems March 3 - 14 Loveland Instrument Division $2,00O/student Sandy Selleck
Model 3060A May 5 - 16 815 Fourteenth Street, SW
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Troubleshooting Techniques May 12 - 15
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Maintenance Models October 6 - 10 5301 Stevens Creek Boulevard
545 1C/5427A Santa Clara, CA 95050
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Microwave Instruments
8640 AM/FM Signal Generator August 25 - 29 Stanford Park Division $400/student Steve Thomas
8660 Synthesizers 1501 Page Mill Road
435/6 Power Meter or Palo Alto, CA 94304
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(415) 857-2980
(after February 1, 1980)
Signal Analysis
Spectrum Analyzers August 6 - 8 Santa Rosa Division $300/student Jim Boyer
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Model 8559A (inc. August 4 - 5 Santa Rosa Division $250/student Jim Boyer
182T mainframe)
iuppiernen: t
o to improve +250V power supply reliability.
1350A GRAPHICS TRANSLATOR
tion to improve high accuracy gain measurement.
3779A-6. Serials 1909U-00145 and below. Modifica-
tion to improve gain adjustment for the 12Hz and
1350A-4. Serials1 750A00333 through 1906A00610. 40Hz selective filters.
Modification to correct intermittent loss of memory. 3779A-7. Serials 1909U-00145 and below. Modifica-
tion to improve performance during basic analog
1820A TIME BASE self-test.
1820A-8. All serials. Preferred replacement for tran- 3779A-8. Serials 1915U-00150 and below. Modifica-
sistors 0107. tion to improve performance during quantizing dis-
tortion D-A measurement.
1821A TIME BASE 3 779A-9. Serials 1915U-00150 and below. Modifica
1821A-10. All serials. Preferred replacement for tran- tion to improve performance.
dl Any sistors Q107 and Q305.
1821F TIME BASE
37798 PRIMARY MULTIPLEX ANALYZER
37798-5. Serials 190911-00145 and below. Modifica-
rice 1821F-1. All serials. Preferred replacement for tran-
sistors Q107 and (2305.
tion to improve high accuracy gain measurement.
37798-6. Serials 1909U-00145 and below. Modifica-
tion to improve gain adjustment for the 12Hz and
2804A QUARTZ THERMOMETER 40Hz selective filters.
2804A-1. Serials 1744A00277 and below. Modification 37798-7. Serials 190911-00145 and below. Modifica-
to correct EO1 and line with HP-18. tion to improve performance during basic analog
self-test.
3312A FUNCTION GENERATOR 37798-8. Serials 1915U-00155 and below. Modifica-
3312A-2. Serials 1432A03456 to 1432A04515. Modifi- tion to imorove oerformance durina quantizing dis-
,
.
e latest listing of Service cation to improve distortion at low end of frequency tortion D-Lmekurement.
dial. 3 7798-9. Serials 191511-00155 and beslow. Modifica.
vailable for Hewlett- tion to improve performance.
?roducts. To obtain infor- 3325A SYNTHESIZER1
FUNCTION GENERATOR 3780A PATTERN
)r instruments you own, GENERATORIERROR DETECTOR
3325A-1A. Serials 1748A01200 and below. Modifica-
le order form and mail it tion to the over-voltage protection circuit of the A2 3780A-9A-S. Serials between 161OU-00161 and
162011-00230 inclusive. Modification to prevent
3P distribution center power supply.
short circuit in line input wiring.
3325A-3. Serials 1748A01300 and below. Modification
DU. to improve status byte operation. 3780A-14A. Serials 162OU-00211 and above. Modifi-
3325A-4. Serials1 748A01075 and below. Output fuse cation to eliminate incorrect detection of systematic
MICROWAVE AMPLIFIER change. errors.
3780A-17. All serials. Retrofit kit instructions for option
als 826-0131 1 through 1717A02352.
3438A DIGITAL MULTIMETER 100.
1 to eliminate arcing in high voltage
3438A-4. All serials. Correction of U726 signatures.
4940A TRANSMISSION IMPAIRMENT
A DIGITAL RECORDER 3455A DIGITAL VOLTMETER MEASUREMENT SET
serials. Modification to eliminate shock 3455A-12C. Serials 1622A04830 and below. Modifica- 4940A-15. Modification to improve low frequency
le front panel door. tion to improve ohms converter response time. phase jitter measurement.
3455A-14. All serials. Modifications to improve N D
15A AC CALIBRATOR converter performance. 5045A DIGITAL I.C. TESTER
Serials 00741-00101 through 5045A-17. Procedure to verify automatic IC handler
0 and 745A-Hl8's 1319A01671 and 3467A LOGGING MULTIMETER signals.
lification to eliminate safety hazard at 3467A-1. Serials 1821A00320 and below. Modification 5045A-1 EA. Serials 1852A00368 and below except
tput 8 and C. to protect A9U1 and A9U2 from damage when 1852A-00210,00301, 00326, and 00347. Modifica-
?rials. New troubleshooting and calibra- analog shield is removed. tion to provide static protection.
Are. 5045A-19. Cable modification for Trigon T2000 auto-
34698 DIGITAL MULTIMETER matic handlers.
COAXIAL SLIDING LOAD 34698-7. Serials 1233A01150 and below. Procedure
ials. Procedure to lubricate coaxial slid- to replace panel meter.
5062C CESIUM TIME STANDARD
5062C-2A. Serials 1640 and below. Procedure to in-
JY. stall reliability improvement kit.
3710A IF/BB TRANSMITTER
COAXIAL SLIDING LOAD 3710A-21. Serials below 1438U-01012. Preferred re-
ials. Procedure to lubricate coaxial slid- placement of diode A5CR1. 5301A lOMHz COUNTER
5301A-U-1. Serials 1902U-01151 to 1902U-01180.
JY. Modification to improve addressable mode.
3745NB SELECTIVE LEVEL
911C COAXIAL SLIDING LOAD MEASURING SET
I . All serials. Procedure to lubricate co-
5314A UNIVERSAL COUNTER
3745NB-14A. Serials between 1609U and 172OU; and
5314A-2. Serials 1828 and below. New A2 power sup-
load body. all instruments which have been modified according
to service note 3745NB-4D. Modificationto improve ply assembly.
1332A X-Y DISPLAY HP-I8 cable configuration in remote systems.
rials 1616A6800 and below. Recom- 3745NB-188. Serials 1812U and below. Retrofit kit for 5328A UNIVERSAL COUNTER
rts replacement for capacitors A2C16, special option H07. 5328A-198. Serials 1816 and below. Modification to
and C34. 3745NB-208. Serials 1812U and below. Retrofit kits improve trigger level settings.
ials 1616A6300 and below. Modification for special options H15 and H16. 5328A-22A. Series 1624 and 1632. Signature analysis
+ 158V power supply stability. troubleshooting procedure for option 01 1.
3770A AMPLITUDEIDELAY
1333A X-Y DISPLAY DISTORTION ANALYZER 5328AFl096, 5328NF098, 5328NH42,
ials 1913A2400 and below. Recom- 3770A-38. Serials below 190511-00503. Preferred re- C96-5328A MHz UNIVERSAL
rts replacement for capacitors A2C16, placement for power supply module. FREQUENCYCOUNTERS
nnd C34. 5328A-24. All serials. Revision of the A12 amplifier
3 s 1533A2300 and below. Modification
1 37708 TELEPHONE LINE ANALYZER assembly sensitivity-offset adjustment procedure.
1158V power supply stability.
1335A X-Y DISPLAY
37708-14A. Serials below 172811-00246. Modification
to prevent oscillations on assembly A31. 5340A FREQUENCY COUNTER
5340A-12. All serials. A1 and A2 preamplifier trou-
f
ials 1514A6300 and below. Recom- 3771NB DATA LINE ANALYZER bleshooting information.
rts replacement for capacitors A2C16, 3771NB-4. Serials below 192611. Modification to im-
and C34. prove gain hits, dropouts and input balance. 5341 FREQUENCY COUNTER
31s 1514A6000 and below. Modification 3771NB-5. Serials below 1851U-00123 (3771A) and 5341-5. All serials. Preferred replacement part for as-
+158V power supply stability. 1851U-00120 (37718). hew carrying handle. sembly A4.
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5342A MICROWAVE 8165A PROGRAMMABLE SIGNAL SOURCE 8672A SYNTHESIZED SIGNAL GENERATOR
FREQUENCY COUNTER 8165A-4. Serials 1821GO0340 and below. Modification 8672A-6. All serials. Modifications necessary to allow
5342A-13. All serials. Modification to eliminate talk only to improve remote operation. an external signal generator to be substituted for the
problem. 8165A-5. Serials 1812G00340 and below. Modification 20 to 30 MHz phase lock loop in the 8672A (option
to improve LED driver circuit. H04 retrofit).
5345A ELECTRONIC COUNTERS 8165A-6. Serials 1812G00400 and below. Modification
5345A-14. All serials. Elimination of shorting between to keep PC boards in position.
circuit boards and board sockets. 8165A-7. Serials 1812GOO420 and below. Modification 8750A STORAGE-NORMALIZER
5345A-15. Serials 1920A and below. Modification to to improve sweep linearity. 8750A-9. All serials. W2 digital interface cable assem-
improve mechanical interconnection with plug-ins. bly replacement kit.
I 5345A-16. A13 boards with series 1820 and 1912.
Modification to prevent miscounting on REG CLK 8481Al8482Al8483A THERMOCOUPLE 8754A NETWORK ANALYZER
line. POWER SENSORS 8754A-1. Serials 1825A00175 and below. New in-
8481 A-2A/8482A-118483A-l,8481A serials 1550A and sulator for A7 source assembly heat sink.
5363NB TIME INTERVAL PROBE below, 84482A serials 1551A and below, and
5363A-4153638-3. All serials. Preferred replacement 8483A serials 1602A and below. Preferred re-
part for diode assembly CR1.
53638-1. Serials 1832A and below. Modification to
placement for input amplifier assembly. 9571A - DTS 70
9571 A-4. All serials. DTS70 software BUG/DIR
prevent trigger output oscillations. modification.
53638-2. Serials 1920A00190 and below. Modification 8481Hl8482H THERMOCOUPLE 9571A-6. All serials. Modification to prevent DM, MP
to prevent the metal mounting flange of the variable POWER SENSORS errors in regenerated systems.
resistor R18, which is ground, from shorting to the 8481 H-118482H-1. 8481H serials 1545A and below 9571A-7. All serials. Modification to the welcome file
+5V printed trace. and 8482H serials 1545A and below. Preferred re- when memory is reconfigured.
placement for connector assembly. 9571A-8. All serials. Explanation of two bugs in Rev. D
5420A DIGITAL SIGNAL ANALYZER software used with F Series computers. New Rev. E
5420A-16. List of 5420A control cartridges. software eliminates these bugs.
5420A-20. 5441A display: serials 1836 and below. 8568A SPECTRUM ANALYZER
5443A keyboardicontroller: Serials 1904 and below. 8568A-18. All serials. Improved A23FL1 low pass filter
Modification to change LED's to prevent sticky keys. assembly. 10264A LOGIC STATE ANALYZER
10264A-1. Serials 1837A01706 and below (1611A
5526A LASER INTERFEROMETER option 001). Modification to prevent randomly incor-
5526A-5. 5500C laser head: Serials below 1920A. Re- 8640AlB SIGNAL GENERATOR rect triggering.
placement of the high voltage and PZT power 8640A-29. All serials. Test procedure for modulation
supplies. performance tests and adjustments. 33311BIC COAXIAL SWITCHES
86408-34. All serials. Test procedure for alternate 3331 18-2/33311C-1. Serials 1560A and below. Modifi-
5500C LASER HEAD modulation performance tests and adjustments.
5526A-5. 5500C laser head: Serials below 1920A. Re- cation to improve contact reliability of coaxial
placement of the high voltage and PZT power switches.
r7 supplies.
6824A DC POWER SUPPLY
866OAlBIC SYNTHESIZED SIGNAL
GENERATOR
8660A-19A. 8660A: All serials. Preferred power trans-
86245A RF PLUG-IN
86245A-1, Serials 1818A and 1837A. Installation of a
6824A-1. Serials 1914A02730 and below. Preferred former replacement. clamp circuit to prevent frequency lock up.
replacement part for transistor Q2. Q13, Q14. 8660A-30. 8660A: All serials. List of A3A1 and A3A2
remote programming interface assemblies.
8160A PROGRAMMABLE PULSE 86608-18C. 86608 serials 1343A and below. Recom- 86290B RF PLUG-IN
GENE RAT0R mended replacement for A7 power line module. 862908-1. Serials 1852A and below. 10 kHz amplitude
8160A-1. Serials 1804G00187 and below. Modification 868OC-10. 86600: All serials. List of A3A1 and A3A2 modulation on the RF output of the 862908 RF
to improve burst function. remote programming interface assemblies. Plug-In.
Safety
2. Loosen the two printer mecha-
Service Notes nism retaining screws located on
the lower front corners of the
mechanism by turning them 1/4
Service Notes from HP relating to
personal safety and possible equip- turn CCW.
ment damage are of vital importance 3. Slide the printer mechanism out
562A Digital Recorder of the cabinet.
to our customers. To make you more
aware of these important notes, they A shock hazard from the ac power 4. Apply a 1/8 inch (.3cm) thick
are printed on paper with a red bor- switch terminals is present coating of silicone rubber to the
der, and the service note number has whenever the front panel door is power switch terminals. Allow
a "-S" suffix. In order to make you the coating to dry.
immediately aware of any potential open. This condition is corrected by
insulating the terminals with 5. Apply a second coating of silicone
safety problems, we are highlighting rubber over the first, covering the
safety-related service notes here silicone rubber compound (DOW
Corning 731 RTV or equivalent, HP entire back side of the switch at
with a brief description of each prob-
pn 0470-0012) according to the least 1/8 inch (.3cm) thick.
lem. Also, in order to draw your at-
tention t o safety-related service directions i n Safety Service Note 6: Replace the printer mechanism.
notes on the service note order form 562A-2-S.
at the back ofBench Briefs each ap- Please order Safety Service Note
propriate number is highlighted by 1. Unplug the ac power cord and 562A-2-S with the form at the back
being printed in color. open the hinged front panel door. of Bench Briefs.
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