HP 8672A User manual
HP 8672
OPERATING INFORMATION
8672A
- SYNTHESIZED
SIGNAL GENERATOR
Printed: JUNE 1980 o LS a: HEWLETT
© Hewlett-Packard Co. 1977, 1978, 1980 - | | » PACKARD
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Model 8672A
General Information
MODEL 8672A
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Figure 1-1. HP Model 8672A an
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Model 8672A
General Information
SECTION |
GENERAL INFORMATION
1-1. INTRODUCTION
1-2. This manual contains information pertinent to
Installation, operation, testing, adjusting, and
servicing the Hewlett-Packard Model 8672A
Synthesized Signal Generator. The Model 8672A
will generally be referred to as the Synthesizer.
throughout this manual.
1-3. Information pertaining to the Hewlett-Packard
Interface Bus (HP-IB) as it relates to the Synthe-
sizer is found in various sections of this manual.
Section VIII contains a diagnostic program for
checkout of HP-IB functions. A remote operator’s
check is also found in Section VIII.
1-4, Figure 1-1 shows the Synthesizer with all sup-
plied accessories.
1.5. Packaged with this manual is an Operating
Information Supplement. This is simply a copy of
the first three sections of this manual. This supple-
ment should stay with the instrument for use by
the operator. Additional copies may be ordered
separately through your nearest Hewlett-Packard
office. The part number is listed on the title page
of this manual.
1-6. On the title page of this manual, below the
manual part number, is a “Microfiche” part num-
ber. This number may be used to order 100 x
150 mm (4 x 6-ipch) microfilm transparéncies of
the manual. Each microfiche contains up to 96
photo-duplicates of the manual pages. The micro-
fiche package also includes the latest Manual
Changes supplement as well as all pertinent Service
Notes.
1-7. SPECIFICATIONS
"1-8. Instrument specifications are listed in Table
1-1. These specifications are the performance
standards, or limits against which the instrument
may be tested.
1-9. SAFETY CONSIDERATIONS
1-10. This product is a Safety Class I instrument
(provided with a protective earth terminal). The in-
strument and manual should be reviewed for safety
markings and instructions before operation.
1-11. The Synthesizer and all related documenta-
tion must be reviewed for familiarization with
safety markings and instructions before operation.
Refer to the Safety Considerations page found at
the beginning of this manual for a summary of the
safety information.
1-12. Safety information pertinent to the task at
hand (installation, operation, performance testing,
adjustments, or service) is found throughout this
manual.
1-13. INSTRUMENTS COVERED BY MANUAL
1-14. Options. Electrical options 001, 002, 003,
004, 005 and various mechanical options are docu-
mented in this manual. The differences are noted
under the appropriate paragraph such as Options in
Section I, the Replaceable Parts List and the sche-
matic diagrams.
1-15. Serial Numbers. Attached to this instrument
is a serial number plate. The serial number is in the
form 1234A00123. The first four digits and the
letter comprise the serial prefix. The last five digits
form the sequential suffix that is unique to each
instrument. The contents of this manual apply
directly to instruments having the same serial num-
ber prefix(es) as listed under SERIAL NUMBERS
on the title page.
1-16. For information concerning a serial number
prefix not listed on the title page or in the Manual
Changes supplement, contact your nearest Hewlett-
Packard office,
1-17. MANUAL CHANGE SUPPLEMENTS
1-18. An instrument manufactured after the print-
ing of this manual may have a serial prefix that is
not listed on the title page. This unlisted serial pre-
fix indicates that the instrument is different from
those documented in this manual. The manual for
this instrument is supplied with a yellow Manual
Change supplement that contains “change infor-
mation’ that documents the differences.
1-19, Tn addition to change information, the sup-.
plement may contain information for correcting
errors in the manual, To keep this manual as cur-
rent and accurate as possible, Hewlett-Packard
recommends that you periodically request the
latest Manual Changes supplement. 'The supple-
ment for this manual is keyed to this manual's
print ‘date and part number, both of which appear
on the title page. Complimentary copies of the
supplement are available from Hewlett-Packard.
Nou
1-1
General Information Model 8672A
Table 1-1. Specifications (1 of 4)
SPECIFICATIONS
| FREQUENCY CHARACTERISTICS
Range: 2.0 to 18.0.GHz (overrange to 18.599 997 GHz) Reference Outputs: 10 MHz and 100 MHz, 0.2 Vrms
Resolution: 1 kHz, 2.0—6.199 999 GHz nominal into 50 ohms,
~ 2 kHz, 6.212.399 998 GHz Frequency Accuracy: same as time base”.
3 kHz, 12.400 002—18.0 GHz qe .
. Sa Switching Time (CW and AM modes}: < 15 ms to be
Time Base: , | 0 within 1 kHz for frequencies from 2—6.2 GHz, with-
Internal: 10 MHz; Aging Rate is<5x 107 [day in 9 kHz from 6.2 to 12.4 GHz, and within 3 kHz
after 30 day warmup - from 12.4—18 GHz; < 15 ms to be within 3 dB of
External: 5 or 10 MHz; 0.1 to 1 Vrms nominal into final amplitude level for any frequency change on
50 ohms”. the same band.
SPECTRAL PURITY CHARACTERISTICS
Harmonies (up to 18 GHz): <-25 dBe. Power Line Related and Spurious: (Due to fan rotation;
within 5 Hz below line frequency and multiples):
Sub-harmaonics and Multiplies (up to 18 GHz): <-25 dBe.
Option 003 only (400 Hz operation)
Spurious (CW and AM modes“): Carrier (Fc) | Power Line Related and Spurious Levelsat
Non-harmonically related: <—70 dBe, 2.0—6.2 GHz Frequency | Frequency Offset (fy) from Carrier (Fg)
; <—64 dBe, 6.2-12.4 GHz Ranye
2.0-6.2 —40 dBc —50 dBc —65 dBe
Power Line Related and Spurious: (Due to fan rota- 6.2—12,4 —34 dBe | —44 dBc --59 dBe
tion within 5 Hz below line frequency and 12.4-18 —30 aBe —40 dBe —55 dBe
multiples):
q
Except Option 003 Instruments (400 Hz operation) Single-Sideband Phase Noise (1 Hz BW, CW mode):
Carrier(F.)! Power Line Related and Spurious Levels At SSB Phase Noise Ratio (in 1 Hz BW,
Frequency | Frequency Offset (fo) From Carrier (Fe) creduency CW made) at Specified Offset Frequency”
Range | | ange
<<
GHz) | fo<300 Hz|300Hz<f<tkHz| fo >1kH2| | (GHz) | 10Hz | 100 Нг | 1 КНг | 10КН2 | 100 КНЕ
[-2.0-6.2 | —50 dBe —60 dBe — | —65 dBc 20-62 |—58dB | —70dB |-78dB|—86dB|-—110dB
6.2—12.4 | —44 dBc —54 dBe 759 dBe 62-124 |-52dB |-64dB |--720B| —80dB|—104dB
12.4—18.0 | —40 dBc —50 dBe 55 dBe 124—18.0 |-48dB |-60dB |-68dB | — 1648 | - 10048
*аВ referenced to carrier (dBe)
+
1 Reference is kept at operating temperature in STAND-BY mode with the instrument connected to Mains power, For instruments dis-
connected from Mains power less than 24 hours, the aging rate is <5 x 10” ¡day after a 24 hour Warmup,
of time base calibration + aging rate + temperature effects fine
2 Overall accuracy of the internal reference oscillator is a function
10 0 and C5 x 101 +5% —10% line voltage change.
voltage effects. Typical temperature and line voltage effects are C1 x 10
Stability and spectral purity will be partially determined by characteristics of external reference oscillator,
* xternal FM signals at rates < 100 kHz must be disconnected.
1-2
Model 8672A a General Information
Tahle 1-1. Specifications (2 of 4)
RF OUTPUT CHARACTERISTICS
Level: +3 to —120 dBm, +15°C to +35%C55,
Total Indicated Meter Accuracy (+15°C to +35%C):7: 8.9
Frequency Indicated Meter Accuracy at OUTPUT LEVEL RANGE Switch Setting
Range (GHz 0dBm — | —10dBm | -20dBm -30 dBm and Below
(No Attenuation)
2.06.2 £1.75 dB +2.25 dB +2.45 dB | +175 dB +0.3 dB/10 dB step
- below 0 dBm range
6.2—12.4 + 2.0 dB +2.5 dB +2.7 dB +2.0 dB +0,3 dB/10 dB step
below 0 dBm range
12.4—18.0 +2.25 dB +2.85 dB +3.05 dB | +2.25 dB 10.4 dB/10 dB step
below 0 dBm range
Remote Programming Accuracy ” $. 0.75 dB better than meter accuracy indicated above.
“Flatness (0 dBm range, +15 € to +35”): +0.75 dB, 2.0—6.2 GHz
+1.00 dB, 2.0—12.4 GHz
+1.25 dB, 2.0—18.0 GHz
Output Level Switching Time: < 20 ms?19.
Impedance: 50 ohms
Source SWR:!! <2,5
4
S Additional power available on +10 dBm range (overrange), but for power settings above +3 dBm spurious oscillations may degrade
performance,
а o
a 6 ror Option 001 instruments, RF output level specification changes to +5 to —10 dBm from +15 to +35 C: for Option 004, +2,0 dBm
max.: Option 005, +4 to —10 dBm from +15 to +35” C: for Option 008, +8 dBm to —120 dBm from +15°C to +35 C. The RF
output level also changes when options are combined. When Options 001 and 008 are combined, the RF output level specification
is +10 to ~10 dBm. When Options 004 and 008 are combined, the RF output level specification is +7 dBm fo ~3 20 dBm. How-
ever, when Options 005 and 008 are combined, the RF output level specification is +3 dBm to —1 0 dB,
7 Appiies for internal leveling only. ,
S specification includes allowances for meter accuracy (typically 10.50 dB), detector linearity, temperature, flatness, attenuator
accuracy and measurement uncertainty. All but the attenuator accuracy and the measurement error can be calibrated out with a
power meter at fixed vermier settings.
For Option 004 and 005 instruments, total indicated meter accuracy and flatness are degraded by an additional 10.25 dB.
10 Py pically < 10 ms for any change on same output level range.
on the 0 dBm and —10 dfim output level range, specification applies only at the RF output frequency.
1-3
General Information
Model 8672 A
Table 1-1. Specifications (3 of 4)
Depth (for meter readings 0 dBm and below, +15° C to
+35°C):!?
075% from 2.0-6.2 GHz
G-—60% from 6.2—12.4 GHz
0—50% from 12.4—18.0 GHz
Rates (3 dB bandwidth):
10 Hz-100 kHz.
"Frequency Response (100 Hz—10 kHz rates):
+ 0.25 dB.
Sensitivity (percent AM per Vpk):
30%/V and 100%/V ranges, Maximum input 1 Vpk
into 600 ohms nominal, *
Peak Deviation (maximum): The smaller of 10 MHz or
12.4 GHz; 10 MHz or f__, x 15, 12.4~18.0 GHz
50 Hz to 10 MHz; 300 kHz/V and 1, 3, 10 MHz/V
ranges, 1 kHz to 10 MHz,
Freguency Response (relative to 100 kHz rate):
+2.0 dB, 3 kHz—3 MHz, 300 KHz/V and 1, 3,
10 MHz/V ranges.
Sensitivity (peak deviation per Vpk):
30, 100, 300 kHz/V and 1, 3, 10 MHz/V ranges,
maximum input 1 Vpk into 50 ohms nominal, '*
“ Harmonic and Non-Harmonic Distortion:!5 <12% for
rates < 3 kHz, decreasing linearly with frequency to
5% at 20 kHz rate, < 5% for 20 to 100 kHz rates,
13
14
15
16
17
nod X 5, 2.0-6.2GHz; 10 MHz or f__, x 10, 6.2—
Rates (3 dB bandwidth typical): 30, 100 kHz/V ranges,
+2.0 dB, 100 Hz—3 MHz, 30 and 100 kHz/V rañges.
12 ,
The meter reading of output power level when using AM is carrier level only (i.e,, does NOT include power in AM sidebands).
AMPLITUDE MODULATION CHARACTERISTICS
Distortion (for rates less than 10 kHz and meter readings
0 dB and below, +15” C to +35°C):
<3% at 30% depth
<4% at 50% depth
<5% at 15% depth
Indicated Meter Accuracy (100 Hz—10 kHz rates): +5%
of range,
Accuracy Relative to EXT AM Input Level (100 Hz—
10 kHz rates): +10% of range.
Incidental ¢M (Rates < 10 kHz, 30% Depth):
< 0.5 Rad, 2.0-6.2 GHz
< 1,5 Rad, 6.2—12.4 GHz
< 1.0 Rad, 12.4—18.0 GHz
Incidental FM: |
Incidental pM x f rod
FREQUENCY MODULATION CHARACTERISTICS
Residual Em in FM and CW Modes (noise and power line
related)*®
Residual FM in Post Detection
Mode/Range Bandwidth
20 Hz—1 kHz | 20 Hz—3 kHz
CW and 30 kHz/
V thru 3 MHz/V 6 Hz-rms 12 Hz-rms
+ ranges
10 MHz/Y range 10 Hz—rms 20 Hz—rms
Indicated Meter Accuracy (at 100 kHz rate)!”
+10% of full scale at +15°C to +35°C.
+15% of full scale at 0 to +55°C.
Accuracy Relative to External Input Level (at 100 kHz
rate):!? +7% of range at +15°C to +35°C
+10% of range at 0 to +55°C,
incidental AM (rates <100 kHz, peak deviation <1 MHz):
< 10%.
+
1.0V peak gives maximum depth on each range. AM depth is linearly controlled by varying input level between 0 and 1 Vpk,
1 Vpk gives maximum deviation on each range, Peak deviation is linearly controlled by varying input level between O and 1 Vpk,
For certain FM modulating frequencies, spurious FM signals {(non-harmonic¢ distortion) may occur. After demodulation in an external
FM discriminator, the contribution to distortion of these spurious FM signals is typically less than 0.6%.
Residual FM doubles in 6,2—12,4 GHz range: triples in 12.4--18.0 GHz range,
For FM rates other than 100 kHz, add FM frequency response specification.
1-4
Model 8672A
General Information
Table 1-1. Specifications (4 of 4)
Frequency: Programmable over full range (up to
18.599 997 GHz) with same resolution as in man-
uai mode.
Output Level: Programmable in 1 dB steps, +3 to
—120 dBm, plus the 10 dB of overrange.
Operating Temperature Range: 0° to 55°C.
Leakage: Meets radiated and conducted limits of
MIL-1-6181D,
REMOTE PROGRAMMING CHARACTERISTICS
GENERAL CHARACTERISTICS
~ Dimensions: 600 mmD x 425 mmW x 133 mmH
AM Modulation: OFF, 30%/Vpk, and 100%/Vpk ranges.
FM Modulation: OFF; 30, 100, 300 kHz/Vpk; 1, 3,
10 MHz/Vpk ranges.
Other: RF ON, RF OFF, ALC INT, ALC EXT XTAL,
ALC EXT, PWR MTR.
Programming Format; HP-IB (Hewlett-Packard Interface
Bus).
Power: 100, 120, 220, or 240V, +5%, —10% 48-66 Hz
300 VA maximum.
Net Weight: 27.2 kg (60 Ib).
(23-5/8” x 16-3/4” x 5-1/4”).
1-20. DESCRIPTION
1-21. The HP Model 8672A Synthesized Signal
Generator has a frequency range of 2000 to 18 000
MHz. The output is leveled and calibrated from +3
to —120 dBm. AM and/or FM modulation modes
can be selected. The frequency, output level, mod-
ulation modes, and most other modes or functions
can be remotely controlled using the HP-IB pro,
gramming format.
1
1-22. Frequency
1-23. Frequencies from 2000 to 18 000 MHz
(overrange to 18 599.997 MHz) can be tuned from
the front panel. Minimum resolution is 1 kHz from
2000 to 6199.999 MHz, 2 kHz from 6200 to
12 399.998 MHz and 3 kHz from 12 400.002
to 18 600 MHz. Tuning resolutions of 100 MHz,
1 MHz, 10 kHz, or 1 kHz minimum are selected by
front panel pushbuttons.
1-24. Frequency stability is dependent on the
time base, either an internal or external oscillator.
The internal crystal oscillator operates at 10 MHz
while an external oscillator must operate at 5 or
10 MHz. The heart of the Synthesizer, a YIG tuned
oscillator (YTO), is phase-locked to the time base
osciilator.
1-25. Output Level
1-26. The output of the Synthesizer 1s excep-
tionally flat due to the action of the internal auto-
matic leveling control (ALC) loop. The accuracy of
the total indicated output level (the sum of the
front panel meter reading and the attenuator range)
is increased.
1-27. The OUTPUT LEVEL VERNIER controls
the output level as indicated by the front panel
meter { +3 to —10dB). The OUTPUT LEVEL
RANGE switch sets the attenuation of the output
level in twelve 10 dB steps (0 to —110 dBm). The
+10 dBm range (overrange) is also controlled by
the OUTPUT LEVEL RANGE switch.
1-28. Modulation Modes
1-29. Both amplitude and frequency modulation
capabilities are available in the instrument using
either front panel switches or remote program-
ming. External drive signals are used for both AM
and FM operation. AM depth and FM deviation
are linear with the applied external voltage, Full
scale modulation is attained with 1.0 V.peak.
1-30. Two ranges of AM depth are selectable
either from the front panel or via remote pro-
gramming. The front panel meter can be used
to set the AM depths of up to 75% between
2000 MHz and 6200 MHz, up to 60% between
6200 MHz and 12 400 MHz, and 50% between
12 400 MHz and 18 000 MHz. Amplitude mod-
ulation can be performed at any frequency be-
tween 10 Hz and 100 kHz.
1-5
General Information
1-31. FM peak deviation can be set using the
front panel meter. At output frequencies below
6200 MHz, peak deviation is limited to 10 MHz or
five times the modulation frequency, whichever
is lower. From 6200 to 12 400 MHz, peak devia-
tion is limited to the lesser of 10 MHz or ten times
the modulation frequency; from 12 400 to 18 000
MHz the lesser of 10 MHz or fifteen times the
modulation frequency. Usable modulation rates
fall between 50 Hz and 10 MHz. Six ranges of de-
viation sensitivity are selectable either by the front
panel switches or via remote programming.
1-32. Miscellaneous Outputs and Indicators
1-33. The front panel meter indicates output
level, AM depth, or FM peak deviation. The meter
mode is selected by a front panel switch.
1-34. External leveling is selected by a front
panel switch. A power meter or crystal detector
may be used as the leveling loop detector.
1-35. Phase-locked reference outputs of 10 and
100 MHz are available on the rear panel.
1-36. Six front panel status indicators make the
Synthesizer operation easier and aids in reducing
possible operator error,
1-37.
1-38. The Synthesizer is fully programmable via
the Hewlett-Packard Interface Bus. In the remote
mode all front panel controls are disabled except
the LINE and METER MODE switches.
Remote Operation
1-39. The output level is selected in 1 dB steps.
The programmed output level is more accurate
than can be obtained in the local mode. This
© occurs because the output level is set by program-
ming rather than being set by monitoring the meter
réading. The meter reading may be in error due to
meter nonlinearity.
1.40. OPTIONS
1-41. Electrical Options
1-42. Option 001. The RF Output connector is
mounted on the front panel but the internal atten-
uator is omitted. The specified output level is +5
to —10 dBm.
1-43. Option 002. The internal 10 MHz crystal ref-
erence is omitted. |
1-6
Model 8672A
1-44. Option 003. A special fan allows operation
from 400 Hz power Mains.
1-45. Option 004. The Synthesizer's RF output
connector is located on the rear panel, Maximum
output power is +2.0 dBm. Total indicated level
accuracy and flatness is degraded by +0.25 dB.
1-46, Option 005. The Synthesizer’s RF output
connector is located on the rear panel and the
attenuator is omitted. The specified output power
is +4.0 to —10 dBm. Total indicated level accuracy
and flatness is degraded by £0.25 dB.
1-47. Mechanical Options
1-48. The following options may have been
ordered and received with the Synthesizer. If they
were not received with the original shipment and
are now required, they must be ordered from your
nearest Hewlett-Packard office using the part num-
ber included in each of the following paragraphs.
1-49. Chassis Slide Mount Kit. This kit 1s ex-
tremely useful when the Synthesizer is rack
mounted. Access to internal circuits and compo-
nents, or the rear panel is possible without remov-
ing the Synthesizer from the rack. Order HP part
number 1494-0017. When this kit comes with the
Synthesizer, it is identified as Option 006. If the
instrument rack mounting slides are to be mounted
in a standard EIA rack, then an adapter (HP Part
No. 1494-0023) is needed. The slides without the
adapter can be directly mounted in the HP system
enclosures,
1-50. Front Handle Kit. Ease of handling is in-
creased with the front panel handles. Order HP
part number 5061-0089.
1-51. Rack Flange Kit. The Synthesizer can be
solidly mounted to the instrument rack using this
kit. Order HP part number 5061-0077.
1-52. Rack Flange and Front Handle Combina-
tion Kit. This kit is not a front handle kit and rack
flange kit packaged together. The combination is
made up of a unique part which includes both
functions, Order HP part number 5061-0083.
1-53, COMPATIBILITY
1-54. The Synthesizer is compatible with HP-IB
as indicated by the following code: AH1, CO, DCI,
DTQ, LA, LEQ, PP2, RL2, SH1, SR1, T6 and TES,
‘An explanation of the compatibility code may be
Model 8672A
found in the IEEE Standard 488-1975, “IEEE
Standard Digital Interface for Programmable
Instrumentation.”
1.55. For more detailed information relating to
programmable control of the Synthesizer, refer to
Section III in this manual.
1.56. SELECTING THE HP-IB ADDRESS
1.57. The HP-IB address switches are located with-
in the Synthesizer. The switches represent a two-
digit octal number. This number corresponds to
talk and listen address characters which an HP-IB
controller is capable of generating. A table in Sec-
tion II shows all HP-IB talk and listen addresses.
Refer to the paragraph entitled HP-IB Address and
Parallel Poll Response Selection in Section II,
1-58. ACCESSORIES SUPPLIED
1-59, The accessories supplied with the Synthesizer
are shown in Figure 1-1.
a. The line power cable may be supplied in
several combinations of plugs. Refer to Power
Cables in Section IT.
b. Fuses with a 3.0A rating for 100/120 Vac
(HP 2110-0003) and a 1.5A rating for 220/240
Vac (HP 2110-0043) are supplied. One fuse is fac-
tory installed according to the voltage available in
the country of destination. Refer to Line Voltage
Selection in Section II.
с, There dre four extender boards supplied
which aid in performance testing, adjusting, and
troubleshooting the instrument.
1, One 30-pin (15 x 2) extender board,
HP part number 08672-60117.
2. Two 36-pin (18 x 2) extender boards,
HP part number 08672-60020.
3. One 3-section, 30-pins (15 x 2) per
section, extender board, HP part num-
ber 08672-60016 (for use in the AZ
Assembly).
1-60. EQUIPMENT REQUIRED BUT NOT
SUPPLIED
1-61. For Option 002 instruments which lack an
internal frequency standard, an external reference
must be used. The performance of the external
reference should at least match the specifications
General Information
and, in particular, the frequency accuracy’ and
spectral purity of the HP Model 10544C Crystal
Oscillator, When using an external oscillator,
microphonics or line related spurious signals may
increase,
1-62. An external signal source is required if
amplitude or frequency modulation is desired. For
AM, the source should have a variable output of 0
to 1 Vpk into 600 ohms, modulatibn rates up to
100 kHz, and distortion of <1%. For FM, the
source should have a variable output of O to 1 Vpk
into 50 ohms, modulation rates up to 10 MHz, and
distortion of 1%. The HP 651B and 654A test
oscillators are adequate for modulating the Synthe-
sizer and meet the stated requirements,
1-63. A remotely programmable audio source
would be convenient for full remote control of
modulation levels and rates.
1-64. EQUIPMENT AVAILABLE
1-65. The Synthesizer has an HP-IB interface and
can be used with any HP-IB compatible computing
controller or computer for automatic systems
applications.
1.66. The 11712A Support Kit is available to aid
the user in maintaining and servicing the Synthe-
sizer. It consists of cables, adaptors, terminations,
prerecorded programs, extender boards and a test
extender board.
1-67. The prerecorded programs are on tape cas-.
settes and are for use with the HP 9830A and HP
90825A Computing Controllers. The Output Re-
gister Test Board is intended to aid in trouble-
shooting the frequency control circuits,
1-68. Refer to the 11712A Support Kit operating
manual for additional information. It may be
ordered through your nearest Hewlett-Packard
office.
1-69. RECOMMENDED TEST EQUIPMENT
1-70. Table 1-2 lists the test equipment and acces-
sories recommended for use in testing, adjusting,
and servicing the Synthesizer. If any of the recom-
mended equipment is unavailable, instruments with
equivalent minimum specifications may be used.
4 Frequency Accuracy: needed 1 ppm: minimum requirement
10 ppm,
1-7
Model 8672A
Installation
SECTION 11
INSTALLATION
2-1. INTRODUCTION
2-2. This section provides the information needed
to install the Synthesizer. Included is information
pertinent to initial inspection, power requirements,
line voltage selection, power cables, interconnec-
tion, environment, instrument mounting, storage
and shipment,
2-3. INITIAL INSPECTION
| WARNING |
To avoid hazardous electrical shock, do
not perform electrical tests when there
are signs of shipping damage to any por-
tion of the outer enclosure (covers,
panels, meters),
2-4. Inspect the shipping container for damage, If
the shipping container or cushioning material is
damaged, it should be kept until the contents of
the shipment have been checked for completeness
and the instrument has been checked mechanically
and electrically. The contents of the shipment
should be as shown in Figure 1-1. Procedures for
checking electrical performance are given in
Section IV. If the contents are incomplete, if there”
is mechanical damage or defect, or if the instru-
ment does not pass the electrical performance test,
notify the nearest Hewlett-Packard office. If the
shipping container is damaged, or the cushioning
material shows signs of stress, notify the carrier as
well as the Hewlett-Packard office. Keep the
shipping materials for the carrier’s inspection.
2-5. PREPARATION FOR USE
2-6. Power Requirements
2-7. The Synthesizer requires a power source of
100, 120, 220, or 240 Vac, +5% to —10%, 48 to 60
Hz single phase (for Option 003 instruments, 400 Hz
single phase and 120 Vac, +5%, —10% only). Power
consumption is approximately 300 volt-amperes.
| WARNINGS |
This is a Safety Class I product (pro-
vided with a protective earthing termi-
nal). An uninterruptible safety earth
ground must be provided from the main
power source to the product input wir-
ing terminals, power cord, or supplied
power cord set. Whenever it is likely
that the protection has been impaired,
the product must be made inoperative
and be secured against any unintended
operation.
If this instrument is to be energized via
an autotransformer for voltage reduc-
tion, make sure the common terminal is
connected to the earthed pole of the
power source,
2-8. Line Voitage and Fuse Selection
ad ale a a in si a ale ae J me
de a a om ana ee J ор,
A RE ER
BEFORE PLUGGING THIS INSTRU-
MENT into the Mains (line) voltage, be
sure the correct voltage and fuse have
been selected.
Operating voltage is shown
in module window.
SELECTION OF OPERATING VOLTAGE
1. Open caver door, pull the FUSE PULL lever
and rotate to left, Remove the fuse.
2. Remove the Line Voltage Selection Card.
Position the card so the line voltage appears
at top-left corner. Push the card firmly into
the slot.
3. Rotate the Fuse Pull lever to its normal posi-
tion. insert a fuse of the correct value in the
holder. Close the cover door.
Figure 2-1. Line Voltage and Fuse Selection
2.1
installation
2-9. Verify that the line voltage selection card and
the fuse are matched to the power source. Refer to
Figure 2-1, Line Voltage and Fuse Selection.
2-10. Power Cable
| WARNING |
BEFORE CONNECTING THIS IN-
STRUMENT, the protective earth termi-
nals of thisinstrument must be connected
to the protective conductor of the
(Mains) power cord. The Mains plug shall
only be inserted in a socket outlet pro-
vided with a protective earth contact.
The protective action must not be negated
by the use of an extension cord (power
cable) without a protective conductor
(grounding).
2-11. This instrument is equipped with a three-
wire power cable. When connected to an appro-
priate ac power receptacle, this cable grounds the
instrument cabinet. The type of power cable plug
shipped with each instrument depends on the
country of destination. Refer to Figure 2-2 for the
part numbers of the power cable available.
Model 8672A
2-12. HP-IB Address and Parallel Pol! Response
Selection
2-13. In the Synthesizer, the HP-IB talk and listen
addresses and the parallel poll sense and response
line are switch selectable. The following procedure
explains how the switches are to be set. Refer to
Table 2-1 for a listing of the talk and listen address.
2-14. To change the HP-IB address or to select a
different parallel poll response, the top cover of the
Synthesizer and the internal A2 Assembly” s cover
must be removed.
a. Disconnect the line (Mains) power cable.
b. Remove any HP-IB cables or connectors
from the HP-IB connector.
c. Remove the Synthesizer’s top cover and
the A2 Assembly's protective cover. Refer to the
Disassembly and Reassembly Procedures in Section
VII.
d. If the parallel poll sense. or response
switches are to be changed, remove the AZA9
Board Assembly,
e. Select the new address as shown in Table
2-1. The location of the switches are shown on
220/280V 220/240V
OPERATION
PLUG*: NZSS 198/AS 6112
CABLE*: HP 8120-1369
PLUG*: SEV 1011.1959-24507
TYPE 12
CABLE*: HP 8120-2104
OPERATION
106/120V
OPERATION
220/246V
OPERATION
PLUG™: NEMA 6-15P
CABLE*: HP 8120-0638
PLUG®: NEMA 5-15P
CABLE*: 8120-1378
220/240V
OPERATION
PLUG*: CEE7-VH
CABLE*: HP 8120-1689
PLUG*: CEE22-V1
CABLE*: HP 8420-1860
220/240V
OPERATION
220/240V
OPERATION
PLUG*: BS 1363A
CABLE: HP 8120-1351
*The number shown for the plug is the industry identifier for the plug only.
The number shown for the cable is an HP part number for a complete cable including the plug.
Figure 2-2. Power Cable and Mains Plug Part Numbers
2-2
Model 8672A
HP-1B Address and Parallel Poll Response
Selection (cont'd)
Figure 2-3. The HP-IB ADDRESS SELECT switch
settings (for 52 and 53) are in the octal code. For
example, the factory selected addresses are set to
23 (binary 10 011; equivalent to bits b5 through
bi on the table). Therefore, the listen address is
‘3’ and the talk address 15 ‘S’,
{. The PARALLEL POLL SENSE switch
(S4) is set to either the OFF, O (zero) or 1 (one)
position. In the zero position, the less positive level
indicates an affirmative response to the poll.
g. The PPR (Parrallel Poll Response) switch
(51) is set to select one-of-eight lines (one of 1
through 8). The selected line passes the Synthesiz-
ers response to the parallel poll to the HP-IB
controller.
h. Re-install the A2ZA9 Assembly.
1. Replace the A2 Assembly’s internal cover
and the Synthesizer’s top cover,
3. Connect the line (Mains) power cable to
the Line Power Module; connect the HP-IB cable
to the HP-IB connector.
2-15. Interconnections
2-16. Interconnection data for the Hewlett-Packard
Interface Bus is provided in Figure 2-4.
Installation
2-17. Mating Connectors
2-18. Interface Connector. The HP-IB mating con-
nector is shown in Figure 2-4.
2-19. Coaxial Connectors. Coaxial mating connec-
tors used with the Synthesizer should be 50-ohm
Type-N male connectors that are compatible with
those specified in US MIL-C-39012,
2-20. Operating Environment
2-21. The operating environment should be within
the following limitations:
Temperature . ................. 0°C to +55°C
Humidity ............ 0 14 0000 < 95% relative
Altitude .......... < 4570 metres (15 000 feet)
NOTE
RF Output accuracy, flatness and maxi-
mum power will meet specifications only
between 15 and 35°C.
2-22. Bench Operation
2-23. The instrument cabinet has plastic feet and
fold-away tilt stands for convenience in bench
operation. (The plastic feet are shaped to ensure
self-aligning of the instruments when stacked.) The
tilt stands raise the front of the instrument for
easier viewing of the control panel.
HP-IB
ADDRESS SELECT
PARALLEL
POLL SENSE PPR
PARALLEL
POLL RESPONSE
©
[1
Figure 2-3, Location of HP-IB Address and Parallel Poll Switches
2-3
Installation Model 8672A
SIGNAL GROUND SHIELD =— CONNECT TO
PIO TWISTED PAIR WITH 11 ATN РАТИ
PIO TWISTED PAIR WITH 10 50
SHOULD BE GROUNDED | PIO TWISTED PAIR WITH 9 FC
NEAR TERMINATION | PIO TWISTED PAIR WITH 8 NDAC
TWISTED PAIR PIO TWISTED PAIR WITH 7 NRFD
PIO TWISTED PAIR WITH 6 DAV
REN £04
0108 D104
D107 D103
0106 0102
D105 DION
SO me 57 MICRORIBBON
CONNECTOR |
Logic Levels
The Hewlett-Packard Interface Bus logic levels are TTL compatible,
i.e., the true (1) state is 0.0 Vdc to +0.4 Vdc and the false (0) state is
+92.5 Vdc to +5.0 Vdc. 8,
1 Programming and Output Data Format
Refer to Section III, Operation.
Mating Connector
HP 1251-0293; Amphenol 57-30240.
Mating Cables Available |
HP 10631A, 0.9 metres (3 £t.), HP 10631B, 1.8 metres (6 ft.)
HP 10631C, 3.7 metres (12 ft.)
Cabling Restrictions
1. A Hewlett-Packard Interface Bus System may contain no more
than 1.8 metres (6 ft.) of connecting cable per instrument.
9 The maximum accumulative length of connecting cable for any
Hewlett-Packard Interface Bus System is 20.0 metres (65.6 ft.)
Figure 2-4. Hewlett-Packard Interface Bus Connection
Model 8672 A Installation
Table 2-1. USA Standard Code for Information interchange (ASCII)
5 Og Ug 0, 0, tg 19 H 1 NOTE
6, 0 1 0 1 0 1 0 TE
B 5 3
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Ts B.lbaibalb Column—
41 31 721 1 0 1 2 3 4 5 6 7
+ 4} +1 4 Rowl
О 201010 0 NUL DLE SP 0 @ Р + р
0181011 i SOH DE! ! 1 А O a q
ОО 2 STX DE? 2 B R b r
0101111 3 ETX Des # 3 С $ с $
G | 11010 4 EOT D C4 $ 4 О T d t
0111011 5 ENG NAK % 5 E U e u
О 11110 6 ACK SYN & 6 F \ { y
O Tia 7 BEL ETB 7 G W g W
1101018 8 BS CAN { 8 H X h X
1 | 0/01 g HT EM ) 9 | Y | y
118,10 10 LF SUB * J Z | Z
то |111 11 VT ESC + K | k {
11!1[0 0 12 FF FS < |. \
1717011 13 CR GS — = M ] m }
ТЕТ О 14 so RS © > N ^ n
1 | $ |111 15 si US | ? 0 __| © DEL
4 Vv an " J
NOTE 3 NOTE 1 NOTE 2
NOTE 1: HP-IB valid LISTEN addresses
NOTE 2: HP-IB valid TALK addresses
NOTE 3: Logic 1 = OV
2-24. Rack Mounting
| WARNING |
The Synthesizer is heavy for its size
(27.2 kg, 60 Ib}. Care must be exercised
when lifting to avoid personal injury. Use
equipment slides when rack mounting.
2-25. Rack Mounting information is provided with
the rack mounting kits. If the kits were not ordered
with the instrument as options, they may be
ordered through the nearest Hewlett-Packard
office. Refer to the paragraph entitled Options in
Section I.
2-26. STORAGE AND SHIPMENT
2-27. Environment
2-28. The instrument should be stored in a clean
dry environment. The following environmental
limitations apply to both storage and shipment:
Temperature .............. .…. 55° Cto +75°C
Humidity. 000000500000 0000 < 95% relative
Altitude..........< 15 800 metres (50 000 feet)
2-5
Installation
2-29. Packaging
2-30. Original Packaging. Containers and materials
identical to those used in factory packaging are
available through Hewlett-Packard offices. If the
instrument is being returned to Hewlett-Packard
for servicing, attach a tag indicating the type of
service required, return address, model number,
and full serial number. Also mark the container
FRAGILE to assure careful handling. In any cor-
respondence refer to the instrument by model
number and full serial number.
2.31, Other Packaging. The following general
instructions should be used for re-packaging with
commercially available materials:
a. Wrap the instrument in heavy paper or
plastic. (If shipping to a Hewlett-Packard office or
2-6
Model 8672A
service center, attach a tag indicating the service
required, return address, model number, and full
serial number.)
b. Use a strong shipping container. A double-
wall carton made of 2.4 MPa (350 psi) test material
is adequate.
c. Use enough shock-absorbing material (75
to 100 mm layer; 3 to 4 inches) around all sides of
instrument to provide firm cushion and prevent
movement in the container. Protect the control
panel with cardboard.
d. Seal the shipping container securely.
e. Mark the shipping container FRAGILE
to assure careful handling.
Model 8672A
Operation
SECTION III
OPERATION
3-1. INTRODUCTION
3-2. This section explains how to operate the
Synthesizer. Included in this section are descrip-
tions of all front and rear panel controls, connec-
tors and indicators, operator’s checks, operating
instructions, and operator’s maintenance.
3-3. Local operating instructions begin with para-
graph 3-10. Remote operation with the Hewlett-
Packard Interface Bus (HP-IB) is explained begin-
ning with paragraph 3-16.
3-4. PANEL FEATURES
3-5. The front and rear panel features of the
Synthesizer are shown in Figures 3-1 and 3-2 and
are described in Tables 3-1 and 3-2. The tables
contain detailed descriptions of the controls, con-
nectors, and indicators.
3-6. OPERATOR'S MAINTENANCE
3-7. The only maintenance the operator should
normally perform is the replacement of the pri-
mary power fuse (F1) located in the Line Power
Module Assembly (A3A11) shown in Figure
3-2 and the mechanical zero adjustment O of
the meter shown in Figure 3-1, For instructions on
how to change the fuse, refer to Section II, Line
Voltage Selection.
3-8. Mechanical Meter Zeroing
3-9. To mechanically zero the front panel meter
: (see Figure 3-1), set the LINE switch @ to
“ the STANDBY position and place the Synthesizer
in its normal operating position. Turn the mecha-
nical zeroing adjustment clockwise to move the
needle up scale or counter-clockwise to move the
needle down scale, The zero point is located at the
left end of the 0—1 or the 0-3 scales. DO NOT
zero on the left end of the top dB scale at —10 as
this is not the proper zeroing point.
3-10. LOCAL OPERATION
| WARNINGS |
Before the instrument is switched on, all
protective earth terminals, extension
cords, auto-transformers and devices
connected to it should be connected to a
protective earth grounded socket. Any
interruption of the protective earth
grounding will cause a potential shock
hazard that could result in personal injury.
Only fuses with the required rated cur-
rent and specified type should be used.
Do not use repaired fuses or short cir-
cuited fuseholders. To do so could cause
a shock or fire hazard.
Se an me an mm ie de de de алой rong
ls "TN apa a
§ CAUTION $
ANN
Before the instrument is switched on, it
must be set to the voltage of the power
source, or damage to the instrument may
result.
3-11. A procedure for verifying the major func-
tions of the Synthesizer is provided in Tables 3-3
and 3-4. The procedure is divided into two parts:
Local Operator's Checks and Local Operating
Instructions. The Local Operator’s Checks should
be performed first to verify proper operation of
the Synthesizer. The Local Operating Instructions
explain how to set and use the Synthesizer’s con-
trols,
3-12. LOCAL OPERATOR'S CHECK
3-13. Table 3-3 provides general instructions for
checking the operation of the Synthesizer via the
front and rear panel controls.
3-14. LOCAL OPERATING INSTRUCTIONS
3-15. Table 3-4 provides general instructions for
operating the Synthesizer via the front and rear
panei controls.
WARNING
Any interruption of the protective
(grounding) conductor (inside or outside
the instrument) or disconnecting the pro-
“tective earth terminal is likely to make
this instrument dangerous. Intentional
interruption is prohibited.
+
3-1
Model 8672A
Table 3-1. Front Panel Features (1 of 2)
FRONT PANEL FEATURES
O RANGE dBm: LED display indicates the sign and
selected range of the RF output in 10 dB steps from
-110 to +10 dBm, RANGE is determined by the set-
ting of the OUTPUT LEVEL RANGE selector €)
or remotely programmed,
O Meter: automatically ranges to one of three scales,
read according to position of METER MODE selector
LEVEL: —10 to +3 dB scale indication. LEVEL
is determined by the setting of the OUTPUT
LEVEL VERNIER contro! or remotely
programmed and read relative to the RANGE
dBm O level displayed.
AM: 0 to 3 scale is read 0 to 30% and the 0 to 1
scale is read 0 to 100% depending on the setting
of the AM selector © and displayed by the AM
annunciator
FM: O to 3 scale is read 0 to 0.03 MHz, 0 to
0.3 MHz, and 0 to 3 MHz; and the 0 to 1 scale
read 0 to 0.1 MHz, 0 to 1.0 MHz, and 0 to
10 MHz. Depends on the position of the FM
DEVIATION MHz selector (0) and is displayed
by the FM annunciator
@ RF annunciator: ON-OFF indicates when the RF”
OUTPUT
the RF switch
is enabled or disabled, controlled by
or remotely programmed,
1
OVER RANGE: indicates when the +10 dBm range is
selected or remotely programmed.
Q ALC annunciator: indicates whether the ALC (Auto-
matic Level Control) is INT (internal), external XTAL
(crystal), or external MTR (Power Meter) as deter-
mined by the position of the ALC selector
LEV UNCAL indicates an unleveled output or an il-
legal range was programmed remotely (<—110 dBm).
©) AM annunciator: indicates OFF, 30%, or 100% modu-
lation range as determined by the AM selector © or
as remotely programmed.
@ FM annunciator: indicates OFF, 0.03, 0.1, 0.3, 1, 3,
and 10 MHz deviation range for 1 Vpk. Deviation
range is determined by the position of the FM DEVI-
ATION MHz selector O or remotely programmed,
OVER MOD indicates an input signal greater than
1 Vpk at the FM INPUT connector or that the
modulation index is greater than 5, 10, or 15 depend-
ing on the band.
FREQUENCY MHz: LED display indicates the se-
lected frequency.
Frequency Resolution Light Bars: indicate the fre.
quency tuning resolution selected by the FRE-
QUENCY RESOLUTION keys , The first
light bar indicates 100 MHz resolution, the second
indicates 1 MHz, the third indicates 10 kHz, and the
fourth indicates 1 kHz resolution. The light bars to
the left of the one selected will also light.
STATUS Block: annunciators display the internal
conditions of the Synthesizer.
OVEN: when lit, indicates that the crystal oven
is not up to operating temperature.
OUT OF RANGE: when lit, indicates an out of
range (illegal) frequency has been remotely pro-
grammed,
REMOTE: when lit, indicates the Synthesizer is
set to remote operation by an HP-IB controller.
STANDBY: when lit, indicates that power is ap-
plied but the LINE switch 69) is in the STAND-
BY position.
NOT PHASE LOCKED: indicates that one or
more of the phase lock loops are unlocked or the
RF switch @ is in the OFF position.
INTERNAL REF OFF: when lit, indicates when
the rear panel INT-EXT switch O (see Figure
3-2) is in the EXT position.
© HOLD key: disables the TUNING control © on the
front panel and extinguishes the Frequency Resolu-
‘ tion Light Bars
€) PRESET key (3 GHz): sets frequency to 3 GHz and
extinguishes the Frequency Resolution Light Bars O
Model 8672A
Operation
Table 3-1, Front Panel Features (2 of 2)
© AM function switch:
O LINE switch: applies power to the Synthesizer when
set to the ON position; power is supplied to the
crystal oven and the battery charger circuit in the
STANDBY position.
€) FREQUENCY RESOLUTION pushbuttons: selects
tuning resolution in 100 MHz, 1 MHz, 10 kHz, or 1,2,
or 3 kHz steps (depending on the frequency selected),
The HOLD switch clears any frequency resolu-
tion selected.
0 TUNING control: changes the Synthesizer's output
_. frequency by the increments selected by the FRE-
QUENCY RESOLUTION selectors (BJ.
selects OFF, 30%/V, or
100%/V modulation by a signal applied to the AM
INPUT connector . The selected range is display-
ed on the AM annunciator . Modulation per-
centage is read on the Meter O men the METER
MODE selector is set to AM, AM may be re-
motely programmed.
FM INPUT connector: accepts a maximum 1 Vpk
external modulation signal (5007 source impedance).
Deviation varies linearly with the input signal. Devia-
tion ranges are controlled by the FM DEVIATION
switch or remotely programmed.
ALC switch: selects either internal (INT) leveling,
external crygtal {XTAL), or external power meter
(PWR MTR) leveling. The external leveling device
(crystal or power meter) may have either a positive or
negative output, The ALC selector can be remotely
programmed,
FM DEVIATION MHz switch: selects the meter scale
and peak deviation that is obtained with a signal
applied to the FM INPUT connector . The peak
deviation range is displayed on the FM annunciator
and the actual peak deviation is read from the
selected scale on the Meter . The FM DEVIA.
TION MHz selector can be remotely programmed.
AM INPUT connector: accepts a maximum 1 Vpk
external modulation signal (600 ohm impedance).
A 1 Vpk signal develops full scale modulation as se-
lected by the AM selector © or as programmed
O
remotely. Percent modulation varies linearly with the
input signal.
QUTPUT LEVEL VERNIER: adjusts the RF output
- level over the range of +3 to —10 dB, relative to the
O
©
©
©
©
Output Level Range as read on the Meter O . The
Vernier function is programmable in 1 dB steps.
EXT ALC INPUT connector: accepts positive or nega-
tive leveling signals from either a power meter or crys.
tal detector as selected by the ALC selector
Mechanical Meter Zero: sets meter suspension so the
Meter © indicates zéro when power is removed
from the Synthesizer and the Synthesizer is in its nor-
mal operating position.
CAL control: adjusts the ALC gain to match the ex-
ternal leveling device in use, The CAL control must
be returned to the fully clockwise position when the
Synthesizer is returned to internal leveling,
OUTPUT LEVEL RANGE: selects the RF output
level range in 10 dB steps from +10 to —110 dBm,
The selected range is displayed by the RANGE dBm
LED readout (Y . The range may also be pro-
grammed remotely.
PEAK-NORM control: generally left in the NORM
detented position (fully clockwise). It is used to peak
the RF output at a particular frequency in the band
at the expense of power at other frequencies.
RF QUTPUT connector: 50 ohm type-N female con-
nector supplies the RF output over the entire fre-
quency range of 2 to 18 GHz,
RF switch: completely turns off the RF output
when in the OFF position. This condition is displayed
in the RF annunciator and causes the NOT
PHASE LOCKED annunciator in the STATUS Block
to illuminate, When the ON position is selected,
the Synthesizer returns to, normal operation. The
functions of the RF switch are programmable,
METER MODE switch: selects either LEVEL, AM,
or FM to be displayed on the meter ©
Operation
Model 8672A
Table 3-2. Rear Panel Features
© e e e
© HP-IB CONNECTOR: connects the Synthesizer to the
Hewlett-Packard Interface Bus for remote operation.
When in remote operation, the STATUS Block (see
Figure 3-1) © REMOTE annunciator illuminates,
100 MHz OUT (A3J7): 0 dBm (nominal) into 50 ohms,
can be used as an external timebase and for trouble-
shooting.
RF QUT (A3J6): only for Options 004 and 005,
50 ohm type N output connector (see Table 1-1 for
Option information).
10 MHz GUT (A348): 0 dBm (nominal) into 50 ohms,
can be used as an external timebase and for trouble-
shooting.
FREQ STANDARD Output (A3J9): 10.000 MHz
into 50 ohms at +7 dBm (nominal) from the internal
frequency standard except when INT/EXT switch
© is in the EXT position,
©
©
FREQ STANDARD INT/EXT switch: normally left
in the INT position. Removes power from internal
frequency standard when in the EXT position.
Jumper (A3W3): normally connects the Internal Fre-
quency Standard Output (A3J9) to the External Fre-
quency Standard Input (A3J10).
FREQ STANDARD input (A3J10): normally con-
nected by A3W3 to A3J9. Also used to connect an
external frequency standard of 5 or 10 MHz at 0 dBm
to the Synthesizer,
Line Power Module: permits operation from 100,
120, 220, or 240 Vac. The number visible in the
window displays the nominal line (Mains) voltage for
which the Synthesizer is set (see Figure 2-1). The pro-
téctive grounding conductor connects to the Synthe-
syzer through this module. The line power fuse
(A3F1) is part of this module and is the only part to
be changed by the operator.
Figure 3-2. Rear Panel Connectors, Switches, and Displays |
3-4
Model 8672A Operation
Tahle 3-3. Local Operator's Checks (1 of 4)
INITIAL CONDITIONS
1. Check that the LINE switch © is in STANDBY and remove the power cable from the Line Power
Module O (see Figure 3-2).
2, Check that Line Power Module © (see Figure 3-2) is set to the nominal line voltage to be used and
that the fuse is the correct value and type.
3. Set the front panel controls and switches as follows:
8 AM selector OFF
ALC selector INT
119 FM DEVIATION MHz selector OFF
OUTPUT LEVEL VERNIER control fully cow
09 OUTPUT LEVEL RANGE control fully cew
PEAK-NORM switch | NORM (detented)
2 RF switch OFF
€) METER MODE selector LEVEL
4. Set the rear panel controls and cables as follows:
© FREQ STANDARD INT/EXT switch — INT
© Jumper (A3W3) Connects A3J9 to A3J10
OPERATION
o.
1. Set the LINE switch O to ON and check for the following conditions:
1
@ RANGE dBm display —110 dBm
© RF annunciator OFF
ALC annunciator INT and LEV UNCAL
© AM annunciator OFF
O FM annunciator OFF
O FREQUENCY MHz display some frequency between 218.6 GHz (if frequency
display is not stable, press PRESET (3 GHz) €) key.
© Frequency Resolution Light Bars extinguished |
O STATUS annunciators
OVEN may be lit and will extinguish when the reference
oscillator oven operating temperature is reached. °
+ NOT PHASE LOCKED a. illuminated and will generally extinguish when the
reference oscillator has warmed up before the OVEN
light extinguishes.
2. Press PRESET (3 GHz) key @}} and FREQUENCY display @ should now indicate 3000.000 MHz.
3-5
Operation Model 8672A
Table 3-3. Local Operator's Checks (2 of 4)
OPERATION (Cont'd)
3. Press one at a time, the four FREQUENCY RESOLUTION keys © ; the Frequency Resolution
Light Bars O should light one at a time and remain lit. Rotate the TUNING control © clockwise
and then counter-clockwise and note that the digits displayed in the FREQUENCY display © increase
and then decrease in order as the TUNING control © is turned. Perform this step as each of the four
FREQUENCY RESOLUTION keys © are pressed. The first key on the left produces resolution in
100 MHz steps, the second key 1 MHz steps, the third key 10 kHz steps, and the fourth key 1 kHz,
2 kHz, or 3 kHz steps, depending upon the frequency band. Pressing the fourth key first will cause all
four of the Frequency Light Bars O to light, Pressing the HOLD O pushbutton causes the Light Bars
© to extinguish and prevents the TUNING control O from changing the frequency displayed.
4. Connect a microwave frequency counter to the Synthesizer as shown in Figure 3-3.
5. Set the RF switch €7) to ON. The ALC Block J) annunciator LEV UNCAL should extiguish. If the
STATUS Block O annunciator OVEN is extinguished, the NOT PHASE LOCKED annunciator should also
extinguish. The Meter O should indicate —10 dB.
=
FR AA. (ACER
(19 MHz OUT MICROWAVE nz] MICROWAVE
ass] SYNTHESIZER 1 FREQUENCY
TEST OSCILLATOR TIME BASE, COUNTER
5082 1 60082 | IN
STEPS
STEP 13
Figure 3-3. Operator’s Frequency and Modulation Checks Test Setup
6. Turn the OUTPUT LEVEL RANGE control © clockwise through each of the thirteen positions
(—110 to +10 dBm). At the 0 and +10 dBm positions and any other positions of interest; vary the
OUTPUT LEVEL VERNIER control & from —10 to +3 dB. In the +10 dBm range, the VERNIER's
range is specified only to +3 dBm output level but some Synthesizers may deliver more power. The RF
Block O annunciator OVER RANGE lights when the +10 dBm range is selected. If the desired power
cannot be produced, the ALC Block O annunciator LEV UNCAL is illuminated.
3-6
Model 8672A | Operation
Table 3-3. Local Operator's Checks (3 of 4)
12,
10.
11.
13.
14,
15.
16,
17,
OPERATION (Cont'd)
Note the frequency on the FREQUENCY MHz display © , Set the LINE switch © to the STANDBY
position. The STATUS Block O annunciator STANDBY should light. Leave the Synthesizer in the
standby condition for several seconds,
Set the LINE switch (7) to ON. The FREQUENCY MHz display @)) should display the same frequency
as was displayed in step 7. The STATUS Block O annunciator STANDBY should extinguish,
Apply power to the test oscillator, set the frequency to 10 kHz and the output level to 0 Vrms, Connect
the test setup as shown in Figure 3-3.
Set the METER MODE selector O to AM and the AM selector (Y to 100%. The AM annunciator ©
100% should be lit. |
Increase the output of the test oscillator slowly from 0.0 tó approximately 0.8 Vrms. As the Meter ©
approaches full scale, the ALC Block O annunciator LEV UNCAL should illuminate, The LEV UNCAL
annunciator is being used in this test as a modulation indicator. Normally having this annunciator
illuminate indicates excessive modulation,
Set the AM selector © to OFF, reduce the test oscillator’s output to 0 Vrms, and remove the cable
from the AM INPUT connector O
Set the test oscillator’s frequency to 160 kHz.
a,
Set the METER MODE selector O to FM and the FM DEVIATION MHz selector © to 3. The FM
annunciator O 3 will light,
Increase the test oscillator’s output from 0 Vrms to approximately 0.5 Vrms. The FM annunciator O
OVERMOD will light when there is excessive deviation or an input signal greater than 1 Vpk.
Disconnect the test setup,
Set the ALC selector €) to INT, METER MODE selector (3) to LEVEL, and the OUTPUT LEVEL
RANGE control O to —10 dBm shown in the RANGE dBm display oO . Adjust the OUTPUT
LEVEL VERNIER control O for 0 dB on the Meter O . This will develop a —10 dBm level at the
RF OUTPUT connector © :
3-1
Operation Model 8672A
Table 3-3. Local Operator's Checks (4 of 4)
OPERATION (Cont'd)
19. Set the RF switch O to ON. Adjust the CAL control O for a steady indication of the Meter © :
This adjusts the loop gain and prevents unwanted oscillations. The ALC Block 2) annunciator LEV
UNCAL lights when oscillations occur or the loop opens, causing unleveling to occur.
20. Set the RF switch O to OFF, Disconnect the power meter and power sensor.
21. Connect a crystal detector as shown in Figure 3-4. Set the ALC selector O to XTAL.
NOTE
The output voltage from the crystal detector may be either
negative or positive polarity.
22, Set the RF switch O to ON and adjust the CAL control O for a steady indication on the Meter O
23. Set the RF switch O to OFF. Disconnect the test setup.
e POWER
MICROWAVE SYNTHESIZER RECORDER | METER POWER
ID a Serum SER
RF EXT ALC
OUTPUT INPUT
lf \
4 CRYSTAL |
DETECTOR
STEP 21 y
STEP 18
Figure 34. Operator's External ALC Checks Test Setup
3-8
Model B672A Operation
Table 3-4. Local Operating Instructions (1 of 4)
1.
SETTING FREQUENCY AND OUTPUT LEVEL
Be sure the Synthesizer is set to local. Make sure the internal reference is selected or an external
reference is connected to A3J10.
Set front panel controls and switches to the following positions:
LINE switch . . . . . . . . . . . ON
FREQUENCY RESOLUTION keys . . . to resolution desired and displayed on Frequency
Resolution Light Bars ©
© 60€
TUNING control . . . . . . . . ... to frequency desired as displayed on Frequency
readout © |
O HOLD pushbutton . . . . . . . . . press pushbutton, the frequency desired is not heid
€) OUTPUT LEVEL RANGE control . . . . 00on RANGE dBm display §J)
O RFswiteh . . . . . . . . . . . . ON
O OUTPUT LEVEL VERNIER control . . . ÓdBon Meter O
This sets a power level of 0 dBm at the.RF QUTPUT connector O
0 dBm + 0 dB =0 dBm
Output Level | Output Level Available Output
Range -—. Vernier | Power
Set the OUTPUT LEVEL RANGE contro! (2) to indicate —10 dBm in the RANGE dBm display O.
Adjust the OUTPUT LEVEL VERNIER control €2)) to indicate —5 dB on the Meter QY) . This sets
an output power level of —15 dBm at the RF OUTPUT connector O .
—10 dBm + {(—5 dB) = —15 dBm
The indication on the Meter © plus the reading on the RANGE dBm display © equals the power
level at the RF OUTPUT connector (3) -
Operation Model 8672A
Table 3-4. Local Operating Instructions (2 of 4)
USING AN EXTERNAL STANDARD
1. On the rear panel (see Figure 3-2), remove Jumper @}) (A3W3) from the FREQ STANDARD EXT
connector E (A3J10), and set the FREQ STANDARD INT/EXT switch © to EXT.
2. Connect an external frequency standard of 5 or 10 MHz, 0 dBm (nominal) into 50 chms impedance to
the FREQ STANDARD EXT connector () .
3. Set the LINE Y) switch to ON and the RE switch E) to ON.
- 4, The front panel display should indicate as follows:
STATUS annunciator. . . . . . . . . INTERNAL REF OFF
The NOT PHASE LOCKED annunciator may light if the external reference is not of sufficient accuracy
in frequency or has an insufficient power level. The external reference must be within +200 Hz of 10 MHz
{or £100 Hz of 5 MHz for reliable locking to oceur.
о. The Synthesizer may now be used for any of its normal operations.
SETTING AMPLITUDE MODULATION
1. Set front panel (see Figure 3-1) controls and switches as follows:
Fe
METER MODE selector. . . . . © . AM
1
2. Connect an oscillator with a 600 ohm output impedance to the AM INPUT connector O . Set the
oscillator’s output to 0 Vrms and to the modulation frequency desired,
3. Set the AM Function switch O to 30% or 100%. The Meter O should indicate 0% on the 0 to 3
scale, or 0% on the 0 to 10 scale,
4. Set the OUTPUT LEVEL VERNIER control €) and the OUTPUT LEVEL RANGE control J) to
the level desired from the RF OUTPUT connector O . The OUTPUT LEVEL VERNER 6) contro!
should be set to 0 dB or below for least distortion.
5. Increase the oscillator's output uni! the desired percent modulation between 0 to 30% (full scale) is
reached. Full scale is 1 Vpk.
3-10
Model 8672A | | Operation
Table 3-4. Local Operating Instructions (3 of 4)
SETTING FREQUENCY MODULATION
1. Set front panel (see Figure 3-1) controls and switches as follows:
METER MODE selector , . . . o. . . . FM
2. Connect a modulation source with a 50 ohm output impedance to the FM INPUT connector O .
Set the oscillator’s output to 0 Vrms and to the modulation frequency desired.
3. Set the FM DEVIATION MHz selector © to the desired deviation range, The peak deviation is shown
on the Meter O . The 0.03, 0.3, and 3 ranges are indicated on the Meter о on the Q to 3 scale and
the 0.1, 1, and 10 ranges are indicated on the 0 to 1.0 scale.
4. An FM input of 1.0 Vpk (0.707 Vrms) represents full scale modulation. Set the input level to obtain
the desired deviation within the specified modulation index and deviation limits.
5. The FM annunciator © OVERMOD will light to indicate that an over modulation condition exists.
This can occur if an input signal of greater than 1 Vpk is applied or if the maximum allowable modulation
index is exceeded. The STATUS BLOCK O annunciator NOT PHASE LOCKED may also illuminate
under conditions of excessive deviation.
SETTING EXTERNAL ALC WITH A POWER METER OR CRYSTAL DETECTOR
1, Set front panel (see Figure 3-1) controls and switches as follows:
EJ PEAK-NORM control . . . . . ... NORM (detented)
@& RFswitch . . . . . .. .... ON
O) Meter Mode selector. . . . . . . . LEVEL
2. Set the LINE switch (Y to ON and set the OUTPUT LEVEL VERNIER control €) and the
OUTPUT LEVEL RANGE control €2) for —10 dBm output.
e 3. Connect the external leveling crystal detector (XTAL) or a power meter (PWR MTR) to sense the
` RF signal level at the point {o be leveled. The leveling device may produce either a positive or
negative polarity output voltage. The Synthesizer automatically produces the proper polarity
signal to use with the ALC loop. |
4a. If using a crystal detector, connect the detectors output to ine EXT ALC INPUT connector O Ll
Set the ALC selector {J to XTAL. |
4b. If using a power meter, connect the Recorder Output to the EXT ALC INPUT connector O . Set
the ALC selector O to PWR MTR,
3-11
Operation | | Моде} 8672 А
Table 3-4. Local Operating Instructions (4 of 4)
SETTING EXTERNAL ALC WITH A POWER METER OR CRYSTAL DETECTOR (Cont'd)
NOTE
If the HP 4364 Power Meter is to be used, set the Synthe-
sizer's output level to —1 dBm with the ALC selector Ys
to INT. Depress the RANGE HOLD pushbutton on the 436A.
If the RANGE HOLD pushbutton is not depressed, the power
meter may slowly oscillate due to autoranging.
5 Setthe OUTPUT LEVEL RANGE control © and the VERNIER control JJ) for the desired power
level,
6. Adjust the CAL control O to obtain ¢ stable, leveled power output 10 dB below the output level
indicated by the RANGE dBm displáy @};and the indication on the Meter (Y) . The 10 aB offset
places the ALC loop in the center of its dynamic range.
3-12
bus when in remote or local.
-. Synthesizer’s front panel controls are disabled and
Model 8672A
3-16. REMOTE (HP-1B) OPERATION
3-17. The Synthesizer can be operated through the
Hewlett-Packard Interface Bus (HP-IB). For further
information about the HP-IB, refer to IEEE Stand-
ard 488-1975, the Hewlett-Packard catalog, and the
booklet “Improving Measurements in Engineering
and Manufacturing” (HP Part No. 5952-0058).
Synthesizer compatibility, programming, and data
format is described in the paragraphs which follow,
3-18. Synthesizer Talk and Listen address, and
Parallel and Serial Poll response selection is de-
scribed in Section IT,
3-19. For Synthesizer remote checkout and trou-
bleshooting, refer to the Remote Operator’s Check
and the HP-IB Diagnosite Program in Section VIII,
The Remote Operator’s Check verifies that the
Synthesizer’s functions can be programmed while
the HP-IB Diagnostic Program tests the Bus func-
tions of the Synthesizer.
3-20. Compatibility
3-21. The Synthesizer is fully programmable with
the HP-IB. Front panel functions except the
LINE switch , (see Figure 3-1). METER
MODE . selector , PEAK-NORMAL control
, and CAL control O can be programmed.
3-22. The programming capability of the Synthe-
sizer will be described in terms of the twelve bus
messages found ins Table 3-5.
3-23. Local/Remote and Remote/Local Mode
Changes
3-24. The Synthesizer can communicate over the
In remote, the
the Synthesizer can be addressed to talk or listen.
When addressed to listen, the Synthesizer will re-
spond to the Data, Clear (SDC), Local, and Clear
Lockout/Set Local. When addressed to talk, the
Synthesizer automatically stops listening and sends
a status byte over the eight data lines. Also, the
Synthesizer can send a service request (SRQ) and
respond to serial and parallel polis and the Abort
message. In local, the Synthesizer is fully con-
trolled by the front panel, but it will respond to
serial or parallel polls, it’s talk address, and it will
send a service request (SRQ).
3-25. Addressing. The Synthesizer interprets the
byte on the bus’ eight data lines as an ASCII ad-
Operation
dress or command if the remote enable line (REN)
is true and the bus is in the command mode: atten-
tion line (ATN) true and interface clear line (IFC)
false. The Synthesizer's talk and listen addresses
are switch selectable as described in Section II.
Referring to Table 2-1, characters in columns 2 or
3 are valid listen addresses, characters in columns 4
and 5 are talk addresses, and characters in column
1 are commands: device clear (DC), serial poll en-
able (SPE), and serial poll disable (SPD).
3-26. Programming the Local to Remote Mode
Change. The Synthesizer will switch to remote
only when addressed to listen. When first switched
to remote, the REMOTE lamp lights and the VER-
NIER resets to —10 dB, Nothing else will change
from the front panel control settings until the
Synthesizerreceives a data message string. Once in
remote, the synthesizer can be addressed to talk,
re-addressed to listen, programmed to return to
local, or unaddressed with the universal Unlisten
address or Abort message.
3-27. Programming the Remote to Local Mode
Change. The Synthesizer will return to local when
the Local or Clear Lockout/Set Local messages are
sent by the controller. The Clear Lockout/Set Lo-
cal message sets the remote enable line (REN) false.
3-28. Data Messages
3-29. The Synthesizer communicates on the bus
primarily with data messages. It responds to data
messages that program frequency, output level,
modulation and ALC configuration. It sends a byte
that describes its status. Data messages consist of
one or more bytes sent over the bus” 8 data lines
when the bus is in the data mode (attention line
[ATN] false). The Synthesizer receives data mes-
sages when addressed to listen and sends a status
byte when addressed to talk.
3-30. Receiving Data Messages
3.31. The Synthesizer can receive Data messages
when addressed to listen. The Data message string,
or program string, consists of one or more ASCII
characters, arranged as a program code followed by
arguments. The codes and-arguments for a given
function need not be on the same program line.
3-32. Data Input Format. The program string syn-
tax is as shown in Example 1, For example, to pro-
gram the four functions for 12.596365 GHz,
—94 dBm AM and FM OFF, and ALC internal nor-
mal, use the program codes and arguments in Table
3.10 and write the string as in Example 2.
3-13
Operation
Model 8672A
Table 3-5. Message Reference Table
Message and Identification Applicable Command and Title Response
T6 Talker, L.4 Listener, Synthesizer can change frequency, output
Data Yes AH1 Acceptor Handshake level, modulation, and ALC. Sends status
SH1 Source Handshake byte when addressed to talk.
Trigger (DTO) No Device Trigger Synthesizer does not respond to a Device
Trigger,
Clear (DCI) Yes DCL Device Clear The Synthesizer responds to a DCL or
SDC command by setting frequency to —
Yes SDC Selected Device Clear 3 GHz, Modulation to off, R¥ off, and
ALC to Internal.
Remote (RL2) Yes REN Remote Enable Synthesizer goes to remote when the
REN line is true and the Synthesizer is first
addressed to listen.
Local (RL2) Yes GTL Go to Local Synthesizer goes to local when a GTL
command is received, The frequency
does not change but the front panel
controls determine the other functions,
Local Lockout (RL2) No LLO Local Lockout Synthesizer does not respond to the LLO
command,
Clear Lockout/ Yes REN Remote Disable Synthesizer goes to local when REN goes
Set Local (RL2) false.
Pass Contro!/ No Controller The Synthesizer cannot act as a controller,
Take Control (C8)
4
Require Service {SR1) Yes SRQ Service Request The Synthesizer sets SRQ line true when
when unlocked, unleveled, FM overmo-
dulated or out of range (freq.).
Status Byte Yes SPE Serial Poll Enable The Synthesizer responds to a serial poll
by sending a status byte.
Yes SPD Serial Poll Disable
Status Bit (PP2) Yes PP Parallel Poll The Synthesizer responds fo a parallel
pol! by sending a status bit on a switch
selected data line.
Abort Yes IFC Interface Clear The synthesizer stops listening or talking.
NOTE
3-14
Complete HP-IB capability as defined in IEEE Std. 488
is DCI, RL3, SRI, PP2, T6, L4, AHI, SHI, DTO, CO.
Model 8672 A
Receiving Data Messages (Cont'd)
Operation
EXAMPLE 1
pee Level —s — Modutation —
Frequency Range Vernier AM FM | ALC
| Controller un] TEX... XCX ILOXILOXTLEX IL CX TLC”
WHERE: © = PROGRAM CODE
X = ARGUMENT OR FREQUENCY DIGIT
EXAMPLE 2
80 dBm
Dummy Argument
Frequency Digits
Synthesizer Listen
ee Talk | _ ‘P12596365Z0K9L7MON601"
Code For 10 GHz
Frequency Execute
Level
—4 dB
AM Off
FM Off
J— Norm Internal
Tac
FM
AM
Vernier
The Synthesizer ignores spaces, commas, decimal
points, carriage returns, and line feeds. Paragraph
3-37 has more information on program codes. All
functions may be programmed together as shown *
or separately as will be described in detail in the
following paragraphs. |
3-33. Programming Frequency. The Synthesizer
accepts any frequency within its range to 8 signi-
ficant digits. Above 6.2 GHz the 1 kHz digit is
- rounded up or down to be compatible with the
“ 2 kHz or 3 kHz resolution. Use Figure 3-5 and
Table 3-6 to write the program string with the
following syntax:
Frequency Digits
| Г Dummy Argument
CX... XCX
{stands For Frequency Execute Code
Stands For Program Code For
Most Significant Digit Being Programmed
Table 3-6. Frequency Program Codes and Arguments
Program Codes Arguments
10 GHz
1 GHz
1 MHz
100 kHz
10 kHz
1 kHz
EXECUTE
9 THROUGH 9
FREQUENCY
мо < сн фт
Within the Synthesizer, frequency information is
stored in two blocks of four digits each. One block
is for the 10 GHz through 10 MHz digits; the other
block is for the 1 MHz through 1 kHz digits. Pro-
gramming within one block does not change the
other block unless it is necessary for the Synthe-
sizer to round off the 1 kHz digit for frequencies
above 6.2 GHz. Figure 3-5 illustrates this; use it as
a guide to make Frequency programming easier.
3-15
Operation Model 8672A
FREQUENCY FREQUENCY
PROGRAM ARGUMENTS
CODES |
| y. N
( NN FREQUENCY |
P EXECUTE
PROGRAM
CODE
*
a Be DUMMY
ARGUMENT
Y
T
ADDRESS — — Z 0
*
U
*
\ 0
| *
| 0 0
7
DIGITS —-=| 10 1 | 100 | 10 100 10 1
Np \ | ZN | 7
GHz MHz kHz
DÍ means that for a given program code, this digit will change (to zero if not programmed),
E means that the digit will change only if programmed.
* means that above 6.2 GHz this digit may change~due to random rounding (however, it will always be
within 2 kHz of programmed value).
0 means that for a given program code, the leading zero is supplied by the instrument's hardware.
Figure 3-5. Frequency Programming
‘Receiving Data Messages (Cont'd)
3-34. Programming Output Level. The 0 to —110
dBm positions of the Synthesizer’s RANGE switch,
and the Functions of the VERNIER control are
programmed with the output level string. The
VERNIER control's function is programmed in
1 dB steps from +3 to —10 dB. RANGE is pro-
grammed in 10 dB steps, and the +10 dB position
(over-range) of the RANGE switch is programmed
with the ALC code and argument (see paragraph
3-36). Although it is possible to program the
+10 dB range with 10 dB step attenuation
(RANGE) it is unnecessary and should not be
done!. The output level program string consists of
the program codes for RANGE and VERNIER
each followed by an argument (Table 3-7) as shown.
3-16
Argument For Range
[Argument For Vernier
KXLX
Te code For Vernier »
Code For Range
1
For the Synthesizer to achieve a +10 dBm output level, the
RANGE and VERNIER arguments must be set for 0 dBm.
Model 8672A
Tahle 3-7. Output Level
Program Codes Arguments
0 dBm
10
—20
—30
—40
—50
—60
—70
—80
—90
—100
—110
Output Leve! Range
x
WO DO TS OF Ea» ON a DD
“aw =.
+3 dB
+2
А
9 0 =a CY 01 + OB као
Output Level Vernier
с
10 =
Receiving Data Messages (Cont'd)
3-35. Programming Modulation. The Synthesizer
accepts codes and arguments (Table 3-8) for two
ranges of AM and six ranges of FM. The two modu-
lation types can be used separately or together.
Program string syntax is as follows:
Argument For AM
Argument For FM
MXNX
Code For FM
Code For AM
3-36. Programming ALC. The ALC program string
controls the functions of the RF ON-OFF switch,
the ALC selector switch, and the +10 dBm position
of the output level RANGE switch. The string con-
sists of the program code, which is O (the letter O),
followed by a single argument representing the de-
sired combination of the switch positions, Each
switch position has a numerical weight. Compute
the argument by adding the weights (use the equal
sigh [=] for a weight of 13, and the question mark
[?] foraweightof 17),
Operation
Table 3-8. Modulation
Program Codes Arguments
OFF . Gorl
= M 100% 2
30% 3
OFF 6 or
30 kHz 5
160 kHz 4
= N 300 kHz 3
1 MHz 2
3 MHz 1
10 MHz 0
Weighting is as follows:
RF ON-OFF switch: ALC switch; RANGE switch;
OFF =0 INT = 0 0dBm = 0
ON = 1 XTAL = 4 +10 dBm = 2
MTR = 12
Note that for the Synthesizer to achieve a +10 dBm
RF output level, the output level RANGE and
VERNIER arguments must be set for 0 dBm and
the ALC argument must be appropriate for
+10 dBm output. With RF OFF, combinations of
the other two switches results in arguments of 0,
2, 4, 6, or 8. For RF ON, possible arguments are
in the following table:
Table 3-9. ALC Arguments (with RF ON)
RANGE
switch 0 dBm +10 dBm
ALEC switch
INT 1
ATAL 5 7
MTR = ?
In general, an even argument results in the RF
ON-OFF switch being set OFT, while an odd argu-
ment results in RF ON with the other switch com-
binations as shown in the table. |
3-37. Optional Program Codes. The Synthesizer
interprets any ASCII character in columns 4 and 5
of Table 2-1 as a program code. The two columns
. are equivalent; for example, it will respond the
same way to “7” as it does to “J”. The Synthe-
sizer ignores all other characters.
3-38. Abbreviated Program String. The Synthe-
sizer accepts and processes the characters of a pro-
3-17
Operation
Receiving Data Messages (Cont'd) |
gram string in a left to right sequence, It also auto-
matically counts program codes in the sequence
shown in Table 2-1 columns 4 and 5. This seguence
is equivalent to the program string order shown in
paragraph 3-32. If done in that sequence, program
strings for level, modulation, and ALC can be
written like those for frequency. The program
string will consist of the program code for the first
function being programmed followed by arguments
for all functions as shown below:
Argument For Range
Argument For Vernier
Argument For AM
Argument For FM
| — Argument For ALC
KXXXXX
TT. Program Code For Range
3-39. Programming Execution Time. Programming
execution time is determined by two parameters:
the rate at which data can be input into the Synthe-
sizer over the interface and the time it takes the
Synthesizer to reach the desired output state. The
Synthesizer can typically accept data at rates up to
80 kbytes/second. This is generally a much shorter
time than it then takes the Synthesizer to reach the
desired output state. If the controller and all other
‘instruments on the bus are fast enough, data trans-
fer is then only a small fraction of the total pro-
gram execution time. Typical execution times for
the various functions of the Synthesizer are as
follows:
4
Model 8672A
a. Frequency Switching. The time it takes
to switch from one frequency to the next depends
on the largest frequency digit being changed.
Generally, the smaller the digit being changed, the
shorter the switching time. Typical switching times
by largest digit being changed on the 2.0 to 6.2 GHz
band are shown in Figure 3-6 below. For higher
bands, actual digits being changed must be deter-
mined by dividing the output frequency by 2 (6.2
to 12.4 GHz band), or by 3 (12.4 to 18 GHz band).
If FM is on during a frequency change, switching
time will increase.
Largest
Digit 100 MHz | 10 MHz | 1 MHz [100 kHz ¡10 kHz) 1 kHz
Changed
Time to
be Within} 10 ms 19 ms ¡| 10 msi 5 ms 3 ms 11.5ms
1 kHz
b. Output Level Programming
Qutput range switching (10 dB steps .... <20 ms
Qutput vernier switching (1 dB steps) ... <10 ms
RF ON/OFF switch ON ‚0.0.0000 00000 < 30 ms
RF ON/OFF switch OFF ............. < Bb ms
c. Modulation Programming
FM range change and frequency change
, in FM mode .....eeo.econrcerrerrearno <50 ms
AM range change .....o_eersreroere <15 ms
10 MHz y
1 MHz +
100 kHz —+-- »
ERROR FROM =
DESIRED iF
FREQUENCY RT x
o
—}
1 kHz —+
100 Hz +
$ |
NOTE: SWITCHING TIMES ARE TYPICALLY
MUCH SHORTER, PARTICULARLY FOR
SMALL STEP SIZES.
shia,
/
ps
12 13 14 15
TIME (ms)
Figure 3-6. Typical frequency switching time showing WORST CASE lock and settling times
3-18
Mode] 8672A
3-40. Sending Data Messages
3-41. The Synthesizer sends a status byte when
addressed to talk. This byte is the Synthesizers
response to a serial poll which will be explained in
paragraph 3-59. The Synthesizer will talk when in
local as well as remote,
3-42. Receiving the Trigger Message
3-43. The Synthesizer doesn’t respond to the
Trigger message,
3-44. Receiving the Clear Message
3-45. The Synthesizer responds to the Clear
message by setting the frequency to 3 GHz, ALC
to internal, RF power off, and modulation off.
This message can take two forms: Device Clear,
which the Synthesizer responds to when not ad-
dressed, and Selected Device Clear which the
Synthesizer responds to when addressed to listen.
The Device Clear messages do not affect addressing.
3-46. Receiving the Remote Message
3-47. The Synthesizer is enabled to go into remote
when the controller sends the Remote message, but
does not actually switch to remote until first ad-
dressed to listen. The Remote message is the means
by which the controller sets the remote enable line
(REN) true. Some controllers send this message «
automatically when first turned on or reset,
3
3-48. Receiving the Local Message
3-49. The Synthesizer returns to local front panel
control when it receives the Local message. The
frequency will not change from the last program-
_ med value but the other functions will correspond
“to the front panel control settings.
3-50. Receiving the Local Lockout Message
3-51. The Synthesizer does not respond to the
Local Lockout message.
STATUS BYTE
Operation
3-562. Receiving the Clear Lockout/Set Local
Message a
3-53. The Synthesizer responds to the Clear
Lockout/Set Local message in the same way as to
the Local message (that is, it returns to local). The
Synthesizer need not be addressed to listen. This
message sets the REN line false,
3-54. Receiving the Pass Control Message
3-55. The Synthesizer does not respond to the Pass
Control message as it cannot act as a controller.
3-56. Sending the Require Service Message
3-57. The Synthesizer sends the Require Service
message to the controller when one of the follow-
ing conditions exists for more than 50 ms:
1) Not phase-locked with RF power on.
2) Frequency programmed out of range.
8) RF power level uncalibrated with RF
power on.
4) FM overmodulated with RF power on.
The Synthesizer sends this message by setting the
service request line (SRQ) true. It will request
service in local or remote whether or not it is
addressed.
3-58, Sending the Status Byte Message
3-59. The Synthesizer sends the status byte when
addressed to talk. This byte is the Synthesizer's re-
sponse to a serial poli, The Synthesizer responds to
a serial poll when the controller sends a serial poll
enable command (SPE), then addresses the Synthe-
sizer to talk. The SPE command enables the
Synthesizer to clear the service request (SRQ) when
addressed to talk, Also, when the Synthesizer re-
ceives its talk address, bit 7 of the status byte is
latched. The Controller can then determine the
status of the Synthesizer by converting the status
byte to a decimal value, Status byte coding is as
follows: Е
Bit Number 8 7 6 5 4 3 2 1
Decimal Value 128 | 64 32 16 8 4 2 1
CRYSTAL RSV OUT OF RF NOT LEV FM +10 dBm
Function OVEN REQUEST RANGE OFF PHASE UNCAL | OVER- OVER-
COLD SERVICE (frequency) LOCKED MOD RANGE
3-19
Operation
Sending the Status Byte Message (Cont'd).
3.60. The RSV (Request Service) bit is true when-
ever any of the four conditions that cause a re-
quest for service exists (even during the first 50 ms
after a programming change). Once the Synthesizer
is addressed to talk, the RSV line is latched even
though the Synthesizer’s need for service may
have changed.
3-61. The status byte is useful for determining
when a given programming change has been exe-
cuted. For example, if the Synthesizer is addressed
to talk immediately after a frequency change, the
status byte can be used to determine when the
Synthesizer has re-acquired lock. A frequency
change might be followed by a status byte sequence
of 72. 72, and then 64, indicating the Synthesizer
is now locked. .
3-62. Sending the Status Bit Message
3-63, The Synthesizer outputs a status bit on one
of the Bus data lines in response to a parallel/poil
3-20
Model 8672A
(see controller manual). The line is switch select-
able (see Section II) as is the level of the bit’s logic.
The status bit represents the RSV bit of the status
byte.
3-64. Receiving the Abort Message
3-65. The Synthesizer stops talking or listening
when it receives the Abort Message.
3-66. Programming Quick Reference Guide
2.67. Table 3-10 shows program string syntax,
program codes and arguments, and the status byte.
All possible program codes (including equivalent
duplicates) are shown, but the recommended codes
are indicated with boldface type.
3-68. Programming Examples
3-69. Figure 3-7 is a flowchart showing how to
program all of the Synthesizer functions and the
twelve bus messages in HPL (9825 computing con-
troller), and BASIC (9830 computing controller),
Model 8672A Operation
Table 3-10. Programming Quick Reference Guide
PROGRAM STRING SYNTAX
r— Leve! mg pe Modujation =
Controiler Taik " Frequency Range Vernier AM FM ALC
Synthesizer Listen} , 1] CX ... XCX 1[ CX] [ CX][ CX][ CX1[ CX ]
Stands For Code Dummy Argument
FO | Frequency Execute Code
Frequency Digits
WHERE: C = PROGRAM CODE
X = ARGUMENT OR FREQUENCY DIGIT
PROGRAM CODES ARGUMENTS PROGRAM CODES ARGUMENTS
10 GHz @orP 0 dBm 0
1 GHz Aor 0 re 10 1
2: | 100MHz BorR 2 De ;
=| 10MHEz = CorS ee _40 4
= | 1MHz DorT ÿ THROUGH 9 Tr K _
o = or | 50 5
LL 100 kHz Eor U Tr 60 6
uw. | 10kHZ ForV = —70 7
1 kHz G or W = —80 8
EXECUTE Jor Z —90 9
- = —100 :
OFF 6or7 —110 ;
30 kHz 5
100 kHz 4 +3 dB 9
= № от ^^^ 300 kHz 3 ес +2 1
| Lis +1 2
1 MHz 2 N = 0 3
3 MHz 1 e 1 4
; 10 MHz B > —9 5
m. | —3 6
RF OFF 0,2,4,6,8 > Lory —4 7
INT NORMAL i nal wd 8
‘> | INT, +10 RANGE 3 5 — 9
= 0 or _ XTAL, NORMAL 5 = —7 :
XTAL,+10 RANGE 7 = —8 й
MTR, NORMAL = o -
MTR,+10 RANGE 17
OFF Oorl
= M or ] 100% 2
« 30% 3
STATUS BYTE
Bit Number 8 7 6 5 3 2 1
Decimal Value 128 64 32 16 8 4 ‚2 1
CRYSTAL. RSV OUT OF RE NOT Lev FM +10 dBm
Function OVEN REQUEST RANGE opp | PHASE UNCAL OVER- OVER
COLD SERVICE (frequency) LOCKED MOD RANGE
3-21
Operation
HPL STATEMENTS
rem 7
stp.{or end or whatever)
wrt 719,”K1L7”
wrt 719, M3”
wrt 719,017
cir 719
BASIC STATEMENTS.
START)
—— [REMOTE Message
Send REN command 18 CHI 70
to insure bus is in 0 FORMAT OB
remote enable state CEE OUTPUT CIS SH TÉES
=
ra"
- —| DATA Message
wrt 719,P1234567871”
Program Ar ME epi, ET
frequency of +6 Ci or UT “Fi
12345.678 mHz se STC
Program output
level of —14 dBm
Program 30% AM ев смо UWE CHE!
Program INT ALC 188 CAD TUE a MO
116 TOR
— | CLEAR Message
Send SDC for DEL) a mm
command to preset Le ET LE
synthesizer to 3 GHz, | (56 FORMAT ob
internal ALC, 145 OUTPLIT (1501
raodulation off.
3-22
Figure 3-7. Programming Examples (1 of 2)
Model 8674A
SO CHD "UE": "ELLA"
rel, MELO path qa a u, „8 Н
ap da 5128
Model 8672A | Operation
— — {LOCAL Message
156 CME "TU"
| Send GTL command to 1 | |
lel 719 return synthesizer to Ted FORMAT ЗЕ
1
local | 178 ŒUTPUT 2111 TRATE. рая
A
CHI “mio
IF STATIS <= 1 THEH #59
TT
2
mel”
Service request
on Bus?
Y
if bit{7,rds{7}} gto’ poll”
Feud Tt
En
AE à
-—_
TT
pe о
in
ere
SALTO CL
A
Ted ESE
“IT
Initiate Serial Poll, puts 128 DUTELUT LS SL 2% 9% A Sa SL
poll: rds(719)>S synthesizer status byte cie CRD FRS
into variable S mi Ear TE
aa CED ALIS
‘ cé FUMA UE
\ « STE QUIFUT 21 BER 256 25.512:
ro sor [AB ORT Message
Y
chi 7
Stop the synthesizer
| or from talking or listening Press | STOP | key
oR Press | RESET | key
Figure 3-7. Programming Examples (2 of 2)
3-23/3-24
19
H NLETT
Р; КАНО
HP Part No. 08672-90064 Printed in U.S
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