Hewlett-Packard 8505A Network Analyzer Operating and Service Manual

 HEWLETT yp, PACKARD
Л
OPERATING AND SERVICE MANUAL
SERIAL NUMBERS
This manual applies directly to HP Model 8505A
with serial number prefix
Network Analyzers
1930A. For instruments with serial number lower
than 1930A, refer to the Manual Changes section
of each chapter.
Copyright © HEWLETT-PACKARD COMPANY 1976
1400 FOUNTAIN GROVE PARKWAY, SANTA ROSA, CALIFORNIA 95404 U.S.A,
Printed: AUGUST 1979
MANUAL PART NO. 08505-90077
Microfiche Part No. 08505 90073
CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at the time of
shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are
traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's
calibration facility, and to the calibration facilities of other International Standards Organization
members.
WARRANTY
This Hewlett-Packard instrument product is warranted against defects in material and workmanship
for a period of one year from date of shipment. During the warranty period, Hewlett-Packard Com-
pany will, at its option, either repair or replace products which prove to be defective.
For warranty service or repair, this product must be returned to a service facility designated by HP.
Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to
Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP
from another country.
HP warrants that its software and firmware designated by HP for use with an instrument will execute
its programming instructions when properly installed on that instrument. HP does not warrant that the
operation of the instrument, or software, or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting {rom improper or inadequate maintenance
by Buyer, Buver-supplied software or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper site preparation or main-
tenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IM-
PLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP
SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSE-
QUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL
THEORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are available for Hewlett-
Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are
provided at the back of this manual.
General Information
Model 8505A
MODEL 8505A NETWORK ANALYZER
{Shown with Option 907, Front Handles)
TT EE]
INTERCONNECT CABLE
(08505-60231)
bl wma re
NOTE
The foilowing accessories supplied with the 8505A are not shown:
1. Smith and Log Chart CRT Overlays
2. AC Power Cable |
3. PC Board Extenders {4) {See Accessories Supplied, Paragraph A1-40)
À1-0
Figure Al-1, Model 85 054 Nerwork Analyzer
Model 8505A
General Information
CHAPTER A
MODEL 8505A NETWORK ANALYZER
SECTION |
GENERAL INFORMATION
A1-1. INTRODUCTION
А1-2. The Model 8505A Network Analyzer
comprises three functionally separate but physi-
cally integrated major assemblies: RF
Source/Converter Assembly Al, Frequency Con-
trol Assembly A2, and Signal Processor Assembly
A3. (Al, A2, and A3 are reference designators
used to identify these assemblies throughout the
manual.) The building-block approach used in
construction of the 8505A is also used in the ar-
rangement of the manual. Chapter A 1s divided
into six sections containing information pertaining
to the entire 8505A. This includes specifications,
operating instructions, performance tests, ad-
justments, and sufficient theory and troubleshoot-
ing data to enable you to isolate a malfunction to a
particular one of the three major assemblies.
A1-3. Chapters B, C, and D each cover one
major assembly: Chapter B, the RF
Source/Converter Assembly Al; Chapter C, the
Frequency Control Assembly A2; and Chapter D,
the Signal Processor Assembly A3. Each of these
three chapters is divided into three sections con-
tainmg general information about the assembly, a
complete parts list for the assembly, the assembly
theory of operation and schematic diagrams, and
sufficient data for isolation of a failure within the
assembly to the malfunctioning stage or compo-
nent.
A1-4. DESCRIPTION
A1-5. The 8505A Network Analyzer measures
network performance in the frequency range of
500 kHz to 1300 MHz. Three test input ports, À,
B, and R, each provide 160 dB of dynamic range.
The three test inputs are electrically identical,
with R used as the reference for ratio measure-
ments. A front-panel adjustable ‘line stretcher,”
with an associated readout in meters and cen-
timeters, enables the electrical length of the R
input to be changed to match the electrical length
of the test input. This feature is used to compen-
sate for differences in test cable lengths, and to
measure the electrical length of a network under
test.
Al-6. Any one of the three test inputs, or the
ratio of A/R or B/R, can be selected for presenta-
tion on one or both of two identical but indepen-
dent display channels: CHANNEL 1 and.
CHANNEL 2. These two channels each display
signal magnitude, phase, deviation from linear
phase, and group delay of the under-test device's
transmission or reflection characteristics. A selec-
tor switch enables all of these characteristics ex-
cept group delay to be displayed m either rectan-
gular or polar coordinates. Group delay 1s dis-
played in rectangular coordinates only. Digital
readouts of the displayedicharacteristics are also
provided on the 8505A.
A1-7. The 8505A’s internal signal source pro-
vides seven selectable test signal modes:
logarithmic full-range sweep, linear full-range
sweep, linear expanded sweep (selected start/stop
end points) No. 1, linear expanded sweep No. 2,
linear expanded sweeps No. 1 and No. 2 alter-
nately displayed on display channels 1 and 2 re-
spectively, CW +AF, and CW. Logarithmic full-
range and linear full-range swept signals are pro-
vided in three selectable ranges: 500 kHz to 13
MHz, 500 kHz to 130 MHz, and 500 kHz to 1300
MHz.
Ai-8. The Hewlett-Packard Interface Bus (HP-IB)
allows both the Frequency Control and the Signal
Processor of the 8505A to either receive instruc-
tions from or send data to a remote controller. The
Learn Mode of the HP-IB enables the controller to
store or “learn” the state of the 8505A manually-
set front-panel controls so it can recall this infor-
mation as needed.
А1-1
General Information
A1-9. The three major assemblies (Al, AZ, and
A3) of the 8505A are contained in two chassis
units, stacked one on top of the other and mechan-
ically locked together. The lower unit contains the
КЕ Source/Converter Assembly (Al) and the Fre-
quency Control Assembly (A2). The top unit con-
tains the Signal Processor Assembly (A3) and its
associated CRT display. Each unit has 1ts own ас
power input receptacle and dc power supplies.
A1-10. INSTRUMENTS COVERED BY THE
MANUAL
Al-11. Attached to the upper and lower units of
the instrument are two identical serial number
plates, both inscribed with the same serial number.
As shown in Figure Al-2, the serial number 18 in
two parts. The first four digits and the letter are
the serial number prefix; the last five digits are the
suffix. The prefix is the same for all identical in-
struments; it changes only when a change is made
to the instrument, The suffix, however, is assigned
sequentially and is different for each instrument.
The contents of this manual apply to instruments
with the serial number prefix(es) listed under
SERIAL NUMBERS on the title page.
SERIAL NUMBER
At
f À
PREFIX SUFFIX
Figure A1-2. Serial Number Plate
A-12. Occasionally the manual will be accomp-
anied by a yellow Manual Changes supplement.
The Manual Changes supplement contains changes
that have not yet been incorporated in the manual.
A box in the upper right corner of the Manual
Changes supplement identifies the affected manual
by part number and print date. The supplement
also identifies the serial numbers or serial number
prefixes of instruments affected by it.
Al-2
Model 8505A
Al-13. The Manual Changes supplement (when
there 1s one) is available for updating manuals al-
ready shipped from the factory. To obtain the
latest Manual Changes supplement, contact vour
nearest Hewlett-Packard office.
Ai-14. SAFETY CONSIDERATIONS
A1-15, General
Al-16. This 1s a Safety Class I instrument. This
instrument has been designed and tested accord-
Ing to International Safety Requirements for Elec-
tronic Measuring Apparatus,
A1-17. Safety Symbols
Instruction manual symbol: the ap-
paratus will be marked with this sym-
bol when it is necessary for the user to
refer to the instruction manual in
order to protect the apparatus agamst
damage.
Indicates dangerous voltages.
1 Earth terminal (sometimes used in
=" manual to indicate circuit connected
to grounded chassis).
The WARNING sign denotes a
hazard. i calls attention to a
procedure, practice, or the
like, which, if not correctly per-
formed or adhered to, could
result in injury or loss of life,
Do not proceed beyond a
WARNING sign until the indi-
cated conditions are fully un-
derstood and met.
| WARNING |
E SCSI a ag Ta a a
The CAUTION sign denotes a
hazard. it calls attention to an
operating procedure, practice,
or the like, which, if not cor-
rectly performed or adhered
to, could result in damage to
or destruction of part or all of
the equipment. Do not pro-
ceed beyond a CAUTION sign
until the indicated conditions
are fully understood and met.
EE
oF EC EE TR A
Model 8505 À
A1-18., Operation
{ CAUTION |
BEFORE APPLYING POWER make
sure the instruments TWO ac inputs
are set for the available ac line vo!
tage, that the correct fuses are instal-
led, and that all normal safety precau-
tions have been taken.
Ai-19. Service
A1-20. Although the mstrument has been de-
signed in accordance with international safety
standards, the information, cautions, and warn-
ings in this manual must be followed to ensure safe
operation and to keep the instrument safe. SER-
VICE AND ADJUSTMENTS SHOULD BLE
PERFORMED ONLY BY QUALIFIED SER-
VICE PERSONNEL.
A1-21. Adjustment or repair of the opened in-
strument with the ac power connected s.ould be
avoided as much as possible and, when unavoida-
ble, should be performed only by a sk” d person
who knows the hazard mvolved.
A1-22. Capacitors inside the instrument may
still be charged even though the mstrument has
been disconnected from its source of supply.
A123, Make sure only fuses of the required cur-
rent rating and type (normal blow, time delay,
etc.) are used for replacement. Fuse requirements
are indicated on the instrument’s rear panels. Do
not use repaired fuses or short-circuit fuse hol-
ders.
Al-24. Whenever it is likely that the protection
has been impaired, make the instrument mopera-
tive and secure it against any unintended opera-
tion.
| WARNING E
If this instrument is 10 be energized
through an auto-transformer (for voi-
tage reduction), make sure the com-
mon terminal is connected to the
earthed pole of the power source.
BEFORE SWITCHING ON THE IN-
STRUMENT, the protective earth ter-
Ceneral information
minals of the instrument must be
connected to the protective conduc-
tor of the (mains) power cord. The
mains plug shall only be inserted ina
socket outlet provided with protec-
tive earth contact. The protection ac-
tion must not be negated by using an
extension cord (power cable) without
a protective grounding conductor.
Grounding one conductor of a two-
conductor outiet |s not sufficient pro-
tection.
Any interruption of the protective
(grounding) conductor, inside or out-
side the instrument, or disconnection
of the protective earth terminai is
likely to make this instrument
dangerous. intentional interruption
of the earth ground is prohibited.
Whenever it is likely that the protec-
tion has been impaired, the instru-
ment must be secured against any
unintended operation.
Servicing this instrument often re-
quires (hat you work with the
instruments protective covers re-
moved and with ac power connected.
Be very careful; the energy at many
points in the instrument may, if con-
tacted, cause personal injury.
| WARNING |
At the top left rear of the Signal Pro-
cessor Assembiy AS, under the top
cover, there is a two-position
NORM/BY-PASS switch. When this
switch is set to NORM, the front-panel
LINE ON/OFF switch controls the
primary power into the entire 8505A.
When it is sel to BY-PASS, however,
only the lower unit (Source/Converter
and Frequency Control Assemblies)
is affected by operation of the LINE
switch, the Processor Assembly will
have power applied to it as long as the
line cord (power cable) is connected
to an ac source regardless of the pos-
ition of the LINE switch. DO NOT as-
sume there are no dangerous vol-
tages present in the Signal Processor
Assembiy until you have checked the
position of the NORM/BY-PASS
switch.
Al-3
General Information
A1-25. SPECIFICATIONS
A1-26. In order to provide the maximum amount
of information about the usefulness and flexibility
of the 8505A, both the performance specifications
and the supplemental characteristics are listed in
Tables Al-1 and Al-2. Specifications describe the
instruments warranted performance over the
temperature range of 20° to 30°C. Supplemental
Characteristics are intended to provide information
useful in applying the instrument by giving typical
but non-warranted performance parameters.
A1-27. OPTIONAL 8505A EQUIPMENT
A1-28. Option 005 Phase Lock
AÍ-29. Option 005 provides the capability for
phase-locking the HP 8505A to an external stable
signal source such as the HP 8660A/C Synthesized
Signal Generator or HP 8640A/B Signal Generator.
When phase-locked, the residual FM of the system
approaches that of the external signal source. This
system is useful in making very narrow band meas-
urements. See Chapter E for further information.
A-30. Option 007 Labeling Interface
Al-31. Option 007 provides the capability to ob-~
tain data from the 8505A to 8501 A. Data ob-
tained from the 8505A includes front-panel con-
trol settings, frequency, and Channel 1 and 2
marker measurement information. The 8501A pro-
cesses this data and displays it on the 8505A CRT
as labels and graphics. See Chapter F for further
information.
A1-32. Option 907 Front Handles Kit
A1-33. Option 907 consists of four front handles,
two for each 8505A chassis unit, and the necessary
hardware for attaching the handles. The kit part
number is HP 5061-0089. See Figure A2-2.
A1-34. Option 808 Rack Flange Kit
A1-35. Option 908 contains the flanges and hard-
ware required to mount the 8505SA in an equip-
ment rack with 482.6 mm (19 inches) horizontal
Al-4
Model 8505A
spacing. The kit part number is HP 5061-0077. See
Figure A2-2.
A1-36. Option 909 Rack Flange/Front Handle Kit
A1-37. Option 909 consists of one Option 907
Front Handle Kit and one Option 908 Rack Flange
Kit. (See above.) The kit part number is HP 5061-
0083. See Figure A2-2.
A1-38. Option 910 Additional 8505A Manual
A1-39. Option 910 provides an additional 8505A
Operating and Service Manual.
A1-40. ACCESSORIES SUPPLIED
Al-4i, Accessories supplied with 8505A are:
Table of Accessories
Accessory HP Part Number
08505-60231
10631D
106318
8120-2231 or
Interconnect Cable
HP-IB Cable (0.5 meter)
HP-IB Cable (2 meter)
*One Y -Type AC Power
Cable
Two AC Power Cables
Two AC Power Cables
Two AC Power Cables
Two AC Power Cables
8120-1351 or
8120-1369 or
8120-1689 or
8120-0698
One Set Smith and Los
Chart CRT Overlays
One 8505 A Operating
Instructions Sheet
One 12-Pin (Dual 6-Pin)
Extender Board
Two 30-Pin (Dual 15-Pin)
Extender Board
One 36-Pin (Dual 18-Pin)
Extender Board
One 50-Pin (Dual 25-Pin)
Extender Board
08505-60154
08505-90074
08505-60109
08505-60041
08505-60042
08505-60108
*Power cable supplied depends on configuration of ac power
receptacle at user’s location. Y-type cable connects to both
top and bottom units of 8505A.
Model 8505A
General Information
Table A1-1. 85054 Network Analyzer Performance Specifications (1 of 3)
SOURCE
FREQUENCY CHARACTERISTICS
Frequency Range: 500 kHz to 1.3 GHz in three
ranges; 500 kHz to 13 MHz, 500 kHz to 130
MHz and 500 kHz to 1.3 GHz.
Swept Frequency Accuracy: +1% of range for
linear sweep.
CW Frequency Accuracy: #2 counts + time-base
accuracy.
Frequency Stability: better than £0.01% of reading
+0.01% of frequency range over 10 minutes
after warm up.
FREQUENCY COUNTER CHARACTERISTICS
Frequency counter measurements are made at any
one of five continuously variable marker positions
without interrupting the swept RF signal,
Accuracy:
Counter: £2 counts itime-base accuracy,
Marker Frequency: +0.002% of scan width
counter accuracy.
Time Base Accuracy: +5 ppm £1 ppm/ C £3
ppm/90 days
QUTPUT CHARACTERISTICS
Power:
Range: +10 dBm to —72 dBm,
Accuracy:
Attenuator: £1.5 dB over 70 dB range.
Vernier: £1 dB
Levelling: 20.5 dB from 500 kHz to 1.3
GHz,
Impedance: 500: 216 dB return loss at —10 dBm
output level (<1,38 SWR}.
Spectral Purity”
Residual FM:
Frequency
Range (MHz) | 0.5 t0 13 | 0.5 to 130 | 0.5 to 1309
Residual FM
(Hz rms) 20 Hz 200 Hz 2 kHz
Measurement | 20 Hz — 20 Hz — 26 Hz —
Bandwidth | kHz 1 kHz 10 kHz
Harmonics: >25 dB below main signal at +10
dBm output level. Typically >40 dB below
main signal at —12 dB setting of vernier.
Sub-harmonics and Spurious Signals: Below
50 dBm at +10 dBm output level.
RECEIVER
FREQUENCY RANGE
500 kHz to 1.3 GHz.
INPUT CHARACTERISTICS
Input Channels: Three channels (R, A, and B) with
100 dB dynamic range.
Maximum Input Level {Selectable}: ~ 10 dBm or
= -30 dBm input level,
Noise (10 kHz BW): — 110 dBm from 10 to 1300
MHz; —100 dBm from 2 to 10 MHz; —95 dBm
from 0.5 to 2 MHZ, Typically, -120 dBm using
the —30 dBm input level position and 1 kHz BW,
Impedance: 508: 220 dB return loss (<1,22 SWR}.
Typically >26 dB return loss (<!.11 SWR).
MAGNITUDE CHARACTERISTICS
Frequency Response:
Absolute {A, B, R}: +1.5 dB,
+2.0 dB
41.8 dB
0,0
—1.9 dE
2.0 dB
Frequency (MHz)
Ratio (A/R, B/R): £0.3 dB from 0.5 MHz to
1.3 GHz,
+0,4 dB
+0,2 dB
0.0
—0.2 dB
—0.4 ds
1
Frequency {MHz}
Dynamic Accuracy:
+ 0.01 dB/dB from — 26 to —40 dBm.
+ 0.2 dB from —10 to -50 dBm.
5 dB from 50 to -— 70 dBm.
.0 dB from —70 to —90 dBm,
‚О dB from —90 to — 1060 dBm.
0 dB from -— 100 to —110 dBm,
HoH НО!
da CS
Uncertainity (dB)
a
|+.
А1-5
General Information
Model 8505 A
Table Al-1. 85054 Network Analyzer Performance Specifications (2 of 3)
Crosstalk Error Limits: (>100 dB isolation between
inputs)
1 dB 19°
E 1-10 «Bm on Any Other Input} Ë
ë 61 | 1.9 Ë
= ти Е
E 0.07 dB Er 0.1" &
0.001 dB fees 0.01%
„о > 70 110
Measurement Channel Input Level in dim
Reference Offset:
Range: +199,9 dB.
Accuracy: 20.03 dB 10.003 dB/dB of offset.
Resolution:
Marker Measurement: 0.01 dB over any <10
dB range; 0.1 dB for =10 dB range.
CRT Display: 0.1 dB to 20 dB/division in 1,
2, 5 sequence,
PHASE CHARACTERISTICS
Frequency Response: £3° from 500 kHz to
750 MHz. £57 from 750 MHz to 1.3 GHz.
+6.0°
. Typical
—3
Frequency (MHz)
Range: +180".
Accuracy: +0.01 /degree Гог +170°
+0.01°/degree 10.5” for +180°
Dynamic Accuracy {in 10 kHz Bandwidth):
+ 0.02/dB from —20 to -40 dBm,
+ 0.5” from —10 to -50 dBm.
+ Lo [тот — 50 10 —70 dBm.
+ 3° from —70 to —-90 dBm.
:19"
$ BR нае
8 +4"
3
input Level in dBm
Crosstalk: See amplitude crosstalk specifications.
Reference Offset:
Range: £1700 degrees,
Accuracy: 10.3 £0.5% of offset.
Resolution:
Marker Measurement: 0,17 over <1 007 range
and 1” for 2100” range.
CRT Display: 1° to 180” per division in 8 steps.
POLAR CHARACTERISTICS
Frequency Response, Dynamic Response, Reference
Offset and Marker Measurement specifications are
the same as magnitude and phase characteristics,
CRT Display Accuracy: Actual value 1s within less
than a 3 mm circle of the displayed value,
Tracking Between dB Offset Controls and Polar Full
switch positions: <0.2 dB.
CRT Display Resolution: Magnitude graticules at
20% of full scale spacing; phase graticules at
B. . .
10 increments around unit circle,
DELAY CHARACTERISTICS
Frequency Response: *1 ns from 500 kHz to 1.3 GHz
Delay Accuracy”: £3% of reading + 3 units.
(Units = 1 nsec for 0.5 to 1300 MHz range, 10
nsec for 0.5 to 130 MHz range, and 100 nsec for
0.5 to 13 MHz range.)
Range, Resolution and Aperture?
Frequency
Range (MHz) 0.5 to 13 | 0.5 to 130 | 0.5 to 1300
Range 0 to 80 us | Oto 8 us 10 to 800 ns
Resolution
CRT: 100 ns 10 ns I ns
Marker: 100 ns 10 ns 1 ns
Marker over
limited Range: 10 ns I as 0.1 ns
(<1 us} (< 100 nl {<< 10 ns)
Aperture? 7 kHz 20 kHz | 200 kHz
Reference Offset:
Range: +1999 units,
Accuracy: 10.3 units £0.3% of offset.
А1-6
Model 35U5 A
General Information
Table Al-1. 8505A Network Analyzer Performance Specifications (3 of 3)
ELECTRICAL LENGTH/REF. PLANE EXTEN-
SION CHARACTERISTICS
Calibrated Electrical Length:
Range and Resolution:?
Freguency
Range (MHZ) 0.5 to 13 | C.5 to 130] 0.5 to 1300
XT 219.9 m Ti 99m 119.9 em
Range
x?0| +100 п +10 m +1 m
x1 10 cm | | ст 0.1 cm
Resolution
x10 1 m 10 cm fem
modulation technique,
electrical length,
+3 Units may be calibrated out,
Typical measurement Aperture using linear FM
Vernier provides continuous adjustment of
Accuracy: +3% of reading 1% of range,
Resolution: 10°
Vernier Range: Continuously variable over >10°
range.
Accuracy: +3% of reading +10 /scan.
Phase Compensation Linearity: < +0.2% of
phase slope inserted,
Dimensions: 426 mm wide, 279 mm high, 553 mm
deep (16-3/4 in. x il in. x 21-3/4 in),
Weight:
Net, 36 kg (86 Ib)
Shipping, 48 kg {106 ib)
Table Al-2. Supplemental Characteristics (1 of 2)
SOURCE
Swept Frequency Resolution: {Verniers provide con-
tinuous frequency adjustment.)
Typical CW Noise {SSB in 1 Hz Bw}:
Frequency
Range (MHZ) 0.5 to 13 | 0.5 to 130) 0.5 to 1300
dB below
carrier 70 85 100
Frequency offset
from carrier 1 kHz 10 kHz 150 kHz
Frequency
Range (MHz) G.5 to 13 | 0.5 10 130 0.5 to 1300
Start/Stop 10 kHz 100 kHz | MHz
Cw 10 kHz 100 kHz 1 MHz
TAF ] КН? 10 kHz 100 kHz
CW 100 Hz i kHz 10 kHz
Frequency Counter Resolution: {Least Significant
digit}
Frequency
Range (MHz)
0.5 to 13
0.5 to 130
0.5 to 1300
19 ms
Sweep Time
10 kHz
100 kHz
i MHz
100 ms
Sweep Time
I kHz
10 kHz
100 kHz
>1 second
Sweep Time
100 Hz
i kHz
10 kHz
SOURCE
General Characteristics:
Sweep Modes: Linear Full, Log Full, Start/Stop 1,
Start/Stop 2, Alternate, CW £AF, and CW.
Sweep Times: 10 ms to 100 seconds in decade ranges
with vernier adjustment or manual sweep using
Vernier.
Trigger Modes: Auto, line sync., single scan or exter-
nal sync, up to 50 kHz rate with 22 Vpp and 1
Es trigger signal,
RF Output Connector: Type N Female.
General Information
Model 8505A
Table A1-2. Supplemental Characteristics (2 of 2)
RECEIVER
Input Damage Level: +20 dBm or 2250 Vdc.
Full Scale Polar Magnitude Range: 1 to 0.01 in a I,
0.5, 0,2 sequence,
Electrical Length Linearity: A¢=0.5% x 1,21
(MHZ) x 1 (meters)
Linear Phase Substitution (degrees/scan):
Range: +i1700” per scan with 0° offset.
+1.4 km +4,7 извес
scan width (MHz) scan width (MHz)
Magnitude Offset
Typical Maximum Offset between —10 and —30
dBm Input Level Position: +0,2 dB
(excluding dynamic accuracy).
Typical Maximum Offset between 10 kHz and
1 kHz BW Positions: 20.2 dB
{exluding dynamic accuracy).
Phase Offset
Typical Maximum Offset between —10V and
—30 dBm Input Level Position: <+2.0%
(excluding dynamic accuracy).
Typical Maximum Offset between 10 kHz and
] kHz BW Position: <+ 5°
(excluding dynamic accuracy),
General Characteristics:
RF Input Connectors: Type N Female,
CRT Reference Position: Reference lines for
Channel 1, Channel 2, and beam center {in
Polar) may be independently set to any
position on the CRT Display.
General Characteristics {Cont'd}
Display Bandwidth: Selectable IF bandwidths of
10 kHz and 1 kHz. A video filter position is also
provided.
CRT Background !llumination: Hlumination control
provided for CRT photography.
CRT Overlays: Smith Charts (3.16, 1, 0.5, 0.2, 0.1
full scale}, Log Charts {10 MHz, 100 MHz and
1000 MHz). HP Part No. 08505-60154.
CRT Camera Adaptor: Hewlett-Packard 197A
Option 006 camera is a direct fit. Camera bezel
adaptor model 10375 A is required to convert
the standard 197A camera to fit the 8505A
display.
Auxiliary Qutputs:
Channel 1 and 2 Cutputs: 0.25 V/display division
with 2 k{2 source impedance,
Sweep Output: 0.25 V/display division with 2
k£2 source impedance.
Pen Lift: DC coupled, 200 mA current sink,
Power Requirements: 100, 120, 220, or 240 Vac +5%
—10%, 50 to 60 Hz, approximately 275 watts.
(Total for Signal Processor and Source/Converter-
Frequency Control units.)
A1-42. TEST SETS AND ACCESSORIES
AVAILABLE
A143. Test sets and accessories available for
use with the 8505A are listed wıth their specifi-
cations in Table Al1-3.
A1-8
A1-44, RECOMMENDED TEST EQUIPMENT
Al-45. Equipment recommended for testing and
troubleshooting the 8505A Network Analyzer is
listed in Table Al-4. Other equipment may be
substituted for the equipment listed, providing it
meets or exceeds the critical specifications indi-
cated in the table.
Model 8505A
General Information
Table A1-3. Test Sets and Accessories (1 of 7)
8502A
50 © TRANSMISSION/REFLECTION TEST SET
8502B
75 О TRANSMISSION/REFLECTION TEST SET!
Fo TTT sms sm mmm mm mm
i i
—6 dB
RE { 12 dB Pad pe, Reference
input! 119 dB
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0 ав Directions |
| 0-70 dB Bridge LA
| Step File > Test
| = dB Attenuator | = 33 dB e
| | G dB Atten
6 dB | Setting
Coupling |
! Reflection
| i
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DC Bias
8BO2A RF Schematic
Frequency Range: 500 kHz to 1.3 GHz.
Impedance: 8502 А, 50 £2; 85028, 75 ©).
Directivity: = 40 dB.
Frequency Response”:
Transmission: <+0.8 dB Magnitude and <x8° Phase.
Reflection: <*1.5 dB Magnitude and <+15° Phase
from 0.5 to 1300 MHz; <+10° Phase from 2 to
1300 MHz.
Port Match:
Test Port: 226 dB Return Loss from 2 to 1300
MHz (51.12 SWR) 220 dB Return Loss from
0.5 to 2 MHz (1.22 SWR}.
Test Port Open/Short Ratio: £0.75 dB Magnitude and
+6° Phase from 2 to 1000 MHz; +0.9 dB Magnitude
and +7" Phase from 1000 to 1300 MHz; +1,25 dB
Magnitude and £10° Phase from 0.5 to 2 MHz.
Reference and Reflection Port’: 2725 dB Return Loss
from 2 to 1060 MHz (1.12 SWR); 223 dB Return
Loss 0,5 to 1300 MHz (521.15 SWR}
Input Port? :>23 dB Return Loss (<I.15 SWR).
insertion Loss:
Input to Test Port: 13 dB.
input to Reference Port: 19 dB.
Input to Reflection Port: 19 dB.
Maximum Operating Level: <+20 dBm.
Damage Level: >1 watt CW,
RF Attenuator Range: Ô to 70 dB in 1G-dB steps.
DC Bias Input Range: +30 V dc, 200 mA, some
degradation of RF specification 0.5 to 100 MHz;
500 mA maximum,
BF Connectors: 8502A, 50 {2 Type N Female; 85028
Test Port 75 £2 Type N Female, all other RF connec
tors 50 £2 Type N Female,
DC Blas Input Connector: BNC Female.
Includes: 8502B includes a 50 © to 75 Y minimum
loss pad (11852A),
Recommended Accessory: 11851 A Cable Kit:
11853A 50 £2 N Accessory Kit for 8502A.
11855A 75 £2 N Accessory Kit for 8502B.
Dimensions: 101 mm wide, 61.5 mm high, 204 mm deep
(77 in. x 2-7/16 in. x 8 in.).
Weight:
Net, 1.7 kg (3-3/4 15),
Shipping, 3.1 kg (7 ib).
! Tentative specification for 8502B.
? +degrees specified as deviation from linear phase.
* Other ports terminated in their characteristic impedance.
11851A
RF CABLE KIT
Function: Provides the necessary RF interconnections
and RF shielding required for 8505A Network Ana-
iyzer measuremenis when using the 8502A, 85028
Transmission Reflection Test Sets or the 1 1850A,
11850B Power Splitters,
Kit includes: Three 61 cm (24 in.) 50 £2 cables, phase
matched to 4° at 1.3 GHz and one 86 cm (34 in.).
Connectors: 50 © Type N Male.
Weight: Net 0.91 kg (2 ib). Shipping, 1.36 kg (3 Ib}.
A1-9
General Information Model 8505A
Table A1-3, Test Sets and Accessories ( 2 of 7)
11850A Port Match:
50 {2 POWER SPLITTER Output Ports: 2372 dB Return Loss (1.05 SWR),
Input Port: 220 dB Return Loss (<1:2 SWR).
118508
75 {2 POWER SPLITTER Maximum Operating Level: <+20 dBm input.
ue 95 dB
Burn-out Level: >1 watt CW,
16.70
AAA <…95 dB RF Connectors: 11850A, 50 2 Type N Female; 118508
0 dB Test Ports (3) 75 £2 Type N Female, RF input 50 5
Type N Female,
118509A RF Schematic =—9.5 dB ; Ш
Frequency Range: 500 kHz to 1.3 GHz. Recommended Accessory: 11851A Cable Kit.
Frequency Response (Absolute): Input to Output Includes: 11850B includes three 50 QQ to 75 Q minimum
S+0.,2 ав, loss pads (1185ZA).
Nominal Insertion Loss: 9,54 dB for T1850A; 7.78 Dimensions: 67 mm wide, 46 mm high, 67 mm deep
dB for 11850B, (2-5/8 in. x 1-7/8 in. x 2-5/8 in).
Impedance: 11850A, 50 2; 118508, 75 Q, Weight: Net, 1.8 kg (4 Ib).
Shipping, 3.1 kg (7 1b)
Tracking Between Any Two Output Ports: <0.1
dB Magnitude and <1.5° Phase. Tentative specification for 11850B.
Lead Lengths: Up to 1.5 inches long,
11600B/11602B Frequency Ranges: DC to 2 GHz.
TRANSISTOR
FIXTURES impedance: 50 © nominal.
Return Loss: >26 dB, 160 MHz to 1.0 GHz; >21 dB
from 1 to 2 GHz.
Function: These units allow RF measurements to be Connectors: Hybrid APC-7 precision connections,
made on leaded transistors. Either fixture pro-
vides common emitter, base, and collector for bi- Option 001: Type N Female connectors.
polars, and common source, gate, and drain for
FET's. Other devices also fit the fixtures (tunnel Recommended Accessory: The 11858A Rigid RF cable
diodes, diodes, etc). Interconnect Adapter is recommended for measure»
menís using the 8503A S-parameter Test Set.
Transistor Base Patterns:
Model T1600B: Accepts TO-18/TO-72 packages. Option 003: Includes 11858 A Rigid Interconnect
Will also accept any 3 or 4 lead packages with Adapter for use with 8503 A,
leads that lie on a 0.1-inch circle and whose
diameters are 0.016 to 0.019 inch.
Maximum Power: 10W including RF signals.
Model 11602B: Accepts TO-5/T0-12 packages.
Will also accept any 3 or 4 lead package with Weight:
leads that lie on a 0.2-inch circle and whose Net, 1.1 kg (2-3/8 1b),
diameters are 0.016 to 0.019 inch, Shipping, 1.8 kg (4 ib),
Calibration References: Included for calibration of
the transistor fixtures are two calibration Dimensions:
references; a short circuit termination and a 50 Q 44 mm wide, 152 mm high, 229 mm deep
through-section. (1-3/4 in, x 6 in, x 9 in),
A1-10
Model 8505A
General Information
Table A1-3. Test Sets and Accessories (3 of 7)
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50 {2 S-PARAMETER TEST SET
85038
7582 S-PARAMETER TEST SET
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DC Bias
8503A RF Schematic
Impedance: 50 {).
Directivity: =40 dB.
Frequency Response:
Transmission’ ($21, $12): +1 dB, +12° from 0.5
to 1300 MHz.
Reflection’ (S11, $22): £2 dB, +20° from 0.5 fo
1300 MHz, +15" from 2 to 1300 MHz.
Port Match”:
8503A, Test Port 1 and 2: 28 dB Return Loss
from 2 to 1000 MHz; >26 dB Return Loss from
1000 to 1300 MHz (<1,11 SWR); >20 dB
Return Loss from 0.5 to 2 MHz (<1.22 SWR).
8503B, Test Port 1 and 2:: >24 dB Return Loss
from 2 to 1300 MHz; >18 dB Return Loss
from 0.5 to 2 MHz.
—
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N
Frequency Range: 500 kHz to 1.3 GHz,
Coupling
7 Port 2
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SE03A, Test Port 1 and 2 Open/Short Ratio: <+0.735
dB Magnitude and £6 from 2 to 1000 MHz:
<0.9 dB Magnitude and +7.5° from 1000 MHz
to 1300 MHz; 1.25 dB Magnitude, +10" Phase
from 0.5 to 2 MHz
85038, Test Port 1 and 2 Open/Short Ratio: <+0.9 dB
Magnifude and +75" from 2 to 1300 MHz;
<t1.25 dB Magnitude and +10” from 0.5 to 2 MHz.
Reference and Return Ports: 223 dB Return Loss
from 2 to 1000 MHz {£1.15 SWR): 220 dB
Return Loss from 0.5 to 2 MHz and 1000 to 1300
MHz (1.22 SWR),
RF Input Port: 2220 dB Return Loss from 0.5 to 1300
MHz (1.22 SWR).
Tracking Between Reference and Test Port 1 and 2:
Transmission’ ($21, $12):<+0.5 dB Magnitude and
<+4 Phase.
Reflection’ {811, 822): <+0.75 aB Magnitude and
<+6" Phase.
RF Input to Test Port 1 or 2: <ti.5 dB.
Insertion Loss:
Input to Port 1 and 2:
13 dB Nominal
Input to Port A, B, or R:
19 dB Nominal
Maximum Operating Level: +20 dBm
Damage Level: 1 watt CW
Connectors:
Test Ports: APC-7,
All Other RF Ports: 50 Q Type N Female,
DC Bias Inputs: BNC Female,
DC Bias Input Range: +30 Vde, 200 mA, some deg-
radation of RF specifications 0.5 to 100 MHz;
300 mA maximum.
Includes: Four 19 cm (7% in.) cables with Type N Male
connectors for connection to 8505A.
Recommended Accessory: 11857A Test Port Extension
Cables.
Power: Selection of 100, 120, 220, or 240V +5%—10%,
50 or 60 Hz., approximately 19 watts,
Dimensions: 432 mm wide, 90 mm high, 495 mm deep
(17 in, x 344 in, x 194% in).
Weight: Net, 9.1 kg {20 ib). Shipping, 11.3 kg (25 15),
| FDegrees, specified as deviation from Linear Phase.
* Effective Port match for ratio measurement,
General Information
Model 8505 À
Table A1-3. Test Sets and Accessories (4 of 7)
11857 А/В/С*
TEST PORT EXTENSION CABLES
114857A is DO ohm cable with APC-7 connectors.
Function: Two precision cables extend the 8503 A test
ports for convenient measurement of devices having
any two—port geometry.
Kit Includes: Two 61 cm (24 in.) cables, phase
matched to 2 at 1.3 GHz
Connectors: APC-7,
Weight:
Net, 0.91 kg (2 1b).
Shipping, 1.36 kg (3 15).
11857B is 75 ohm cable with Type № 75 ohm male connectors on one end and Type-N 75 ohm female connectors on the other end,
11857C is 75 ohm cable with Type-N 75 ohm male connectors on one end and GR-900 75 ohm connectors on the other end.
2 11608A
i TRANSISTOR FIXTURE
Function: Provides the capability of completely
characterizing stripline transistors in either the
TO-51 or HPAC-200 package styles, For special
package styles, a through-line microstrip and
bolt-in grounding structure machinable by
customer is available.
Frequency Range: DC to 12.4 GHz.
impedance; 50 £2 nominal.
Return Loss: >26 dB dc to 4 GHz; >23 dB 4.0 to
8.0 GHz; >19 dB to 12.4 GHz,
Microstrip Material: 0.031 in. polyphenylene oxide
(P.P.O,}; 0.080 in. wide 50 © stripline.
Package Styles:
Option 001: Through-line microstrip (P.P,O. plastic)
and bolt-in grounding structure machinable by
customer for special package styles.
Option 002: TO-51 (0,250 in. día.
Option 003: HPAC-200 (0.205 in, día),
Calibration References: Options 002 and 003 are sup-
plied with two calibration references; a short circuit
termination and a 50 {2 through-section,
Connectors: APC-7 Hybrid connectors. Mates with 8503 A
and 87468 S-parameter Test Units. Option 100: Type
N Female connectors,
Maximum Power: 10 W including RF signals,
Weight: Net, 0,9 kg (2 15),
Shipping, 1,4 kg (3 15),
Dimensions: 143 mm wide, 25 mm high, 89 mm deep
(5-5/8 in, x 1 in, x 3% in.).
1121A
AC PROBE
Function: For making signal measurements without
disturbing circuitry and for measuring voltage
transfer functions in impedance systems radically
different from 50 ©, Furnished with 10:1 and
100:1 divider and BNC adapter.
Bandwidth (3 dB): ! kHz to >500 MHz.
Gain: O dB +1 dB.
Frequency Response: 1 kHz to 100 MHz, +0.5 dB,
+2".
Input Impedance: 100 kS2, shunt capacitance 3 pF at 100
MHz, With 10:1 or 10G:1 divider, 1 MO shunt capaci-
tance | pF at 100 MHz.
Output Impedance: 50 $7 nominal,
Maximum input: 300 mV rms, £100 V dc,
With 10:1 divider, 3 V rms, +350 V dc.
With 100:1 divider, 30 Y rms, £350 V dc,
Power: Supplied by 8505A through PROBE PWR jacks.
Warning: The output of the 1121 A is direct coupled
and has an output voltage of approximately —2 to —4
Y. The output must not be de coupled or the probe
may be permanently damaged. If using the T121A with
instruments other than the 8505A, or if an attenuator
pad is to be used at the probe output, be sure a block-
ing capacitor is provided, Model 10240B or equivalent
can be used,
Weight: Net, 0.7 kg (1.5 1b). Shipping 1.2 Кв (2,5 15).
Al-12
Model 8505A General Information
Table A1-3. Test Sets and Accessories (5 of 7)
| 11852A 11855A
50 {2 to 75 Q Minimum Loss Pad 75 © Туре № Accessory Kit
Function: A low SWR impedance conversion 18 re- E . o |
quired for accurate transmission measurements of unction: Provides the RF connecting hardware gen-
75 & devices using the 8505 A Receiver (50 ©). erally required for 75 $ Туре № component
The Minimum Loss Pad provides a matched impe- Measurements using the 85028 Reflection/
dance in both directions, 50 £2 to the 8505 A and Transmission Test Set.
75 & to the device under test, ;
Kit Includes:
Frequency Range: DC to 1.3 GHz. Qty. Description
Insertion Loss: 5.7 dB 2 75 42 Type N Male barrel.
Return Loss: 30 dB ( <1.06 SWR). 2 75 2 Type N Female barrel.
Maximum Input Power: 250 mW (+24 dBm), - 75 $2 Type N Male short circuit
Connectors: 5047 Type N Female to 75 £2 Type N Female 75 82 Type N Female short circuit
Dimensions: Diameter 14 mm, length 70 mm ! Storage Case
(9/16 in. x 2-3/4 in). ; , .
Weight: Net 0.11 kg (4 07). Shipping, 0.26 kg (9 02). Dimensions: 254 mm wide, 64 mm high, 191 mm deep
(10 in, x 2% in, x 7% in).
50 ©) Type N Accessory Kit
Function: The 11853 A furnishes the RF components
generally required when using the 8502A, 11850A, 11856A
and 8503A (8503A requires 85032 A also) when 7582 BNC Accessory Kit
measuring devices having 50 §) Type N connectors.
et \ Function: Provides the BNC connecting В: ; ir
The characteristics of the components in this kit g hardware required
for test setups using the HP 8502B Transmission ; Reflec
ST ements or those tion Test Set, the HP 8503B S-Parameter Test Set, or
; the HP 11850B Power Splitter (75-ohm) to make
Kit Includes: measurements on devices with 758 BNC connectors.
Qty, Description Kit includes:
1 Type N Female short circuit Oty Description
1 Type N Male short circuit 2 7582 Type N Male to BNC Female adapter
2 Type N Male Barrel ' CE
| 2 7582 Type N Male to BNC Male adapter
2 Type N Female Barrel | De |
1 Storage Case 2 7582 Type N Female to BNC Male adapter
Dimensions: 254 mm wide, 64 mm high, 191 mm deep 2 7542 Type N Female to BNC Female adapter
(10 in. x 2% in. x 7% in.). 1 7582 BNC Male short circuit
Weight: Net 0.91 kg (2 Ib). Shipping, 1.36 kg (3 Ib). 1 BNC Male 75¢! termination
1 Storage Case
11854A : ; ; ;
. Dimensions: 168 mm wide, 114 mm deep, SI mm high
50 (2 BNC Accessory Kit (6- 5/8 in. x 4- 1/2 in. x 2 in.)
Function: The 1I18554A furnishes the RF components Weight: Net: 0.91 kg (2 1b). Shipping: 1.36 kg (3 1b).
generally required when using the 8502 A, 11850A, |
and 8503A {8503 A requires the 85032 A also) when
measuring devices having 50 {2 BNC connectors, The
characteristics of the components in this kit insure 11858 A
high quality R measurements for those devices
having 50 £2 BNC connectors.
Rigid Interconnect Adapter
Kit Includes: Function: Provides a rigid R¥ cable interconnection
on NS Descrinti (horizontal to vertical test port orientation) between
y RETO и | the 8503A S-parameter Test Set and the 11600B/
De veto BRC Female adapter 11602B Transistor Fixtures and 11604A Universal
Type N Male to BNC Male adapter Extension (11604 A information provided in 8410S
Fype N Female to BNC Male adapter data sheet)
Type N Female to BNC Female adapter
BNC Male short circuit
} Storage Case
Dimensions: 254 mm wide, 64 mm high, 191 mm deep
{10 in. x 2% in. x 7% in.)
Weight: Net 1.13 kg (2% Ib). Shipping, 1.59 kg (3% ib).
Hu 13 12 0 10
Connectors: APC-7
Dimensions: 254 mm wide, 64 mm high, 191 mm deep
(10 in. x 2% in, x 714 in.),
Weight: Net 0.91 kg (21b). Shipping 1.36 ke (3 1b).
Al-13
General Information
Model 8505A
Table A1-3. Test Sets and Accessories (6 of 7)
85010A/B
8507A/B—8501A Application PAC
Function: Provides a cassette program that supplements
the 85030A/B Application PAC. It provides faster
data transfer and incorporates the normalization and
averaging features of the 8501 À.
Inciudes: Cassette and Operating/Programming Manual.
65030A
8507A/9830A Application PAC
695030B
8507B/9825A Application PAC
Function: Provides three cassette programs. The Accur-
acy Enhancement Program (AIM-30 or AIM-25) im-
proves measurement accuracy by removing mismatch,
directivity and frequency tracking errors for both
one-and two-port devices. The Verification Program
operationally checks calculator/network analyzer
interfaces. The Basic Measurements Program makes
the features of Learn Mode and data printing,
plotting (with 9862A Plotter}, and normalization
availabie to the non-prosrammer.
includes:
Manual
Weight: Net 0.91 kg (2 1b). Shipping 1.36 kg (3 1b).
Cassettes and Operating/Programmers
85032A
50 {} Type N Calibration Kit
Function: This kit is recommended for use with the
8503 A S-parameter Test Set or 8507A Automatic
Network Analyzer for measurement of devices
having Type N RF connectors,
Kit Includes:
Cty. Description
2 APC-7 to Type N Female adapter
2 APC-7 to Type N Male adapter
1 50 © Type N Female termination with
<1.605 SWR at 2 GHz
1 50 £2 Type N Male termination with
<1.005 SWR at 2 GHz
} Type N Female short circuit
1 Type N Male short circuit
1 Storage Case
Dimensions: 254 mm wide, 64 mm high, 191 mm deep
(10 in, x 2% in. x 7% in).
Weight: Net 1.13 kg (2¥21b). Shipping 1.59 kg (3% 1b).
85031A
Verification and APC-7 Calibration Kit
Function: This kit is furnished with the 8507A Auto-
matic Network Anaiyzer and is used for verification
of measurement system performance, 3 dB and 50
dB Pads are included for use with the 8507A’s
verificafion program which functionally checks ail
parts of the 8507 A system. Test data on the pads
is also provided,
Kit Includes:
Oty, Description
I APC-7 50 © Termination
1.005 SWR at 2 GHz
APC-7 Short Circuit
APC-7 3 dB Pad with Test Data
APC-7 50 dB Pad with Test Data
Storage Case
pa ен | ной
Dimensions: 254 mm wide, 64.0 mm high, 19 mm
deep (10 in. x 2% in. x 76 in.).
Weight: Net 0.91 kg (2 1b). Shipping, 1.36 kg (3 Ib).
35033A
SMA Calibration Kit
Function: This kit is recommended for use with the
8503A S-parameter Test Set or 8507A Automatic
Network Analyzer for measurement of devices
having SMA RF connectors,
Kit Includes:
Oty, Description
2 APC-7 to SMA Male adapter
APC-7 to SMA Female adapter
50 £2 SMA Female termination
50 £2 SMA Male termination
SMA Female short circuit
SMA Male short circuit
1 Storage Case
Dimensions: 254 mm wide, 64 mm high, 191 mm deep
(10 in, x 2% in. x 7% in),
Weight: Net 1,13 Kg (2% 1b). Shipping, 1,59 kg (3% 1b),
Puna ful hr o PA
85036A
7592 Type N Calibration Kit
Function: This calibration kit contains 7582 Type N con-
nector adapters, short circuits, and ferminations. This
hardware is required for making error— corrected meas
urements in accuracy enhancement program (AIM) test
setups that use equipment with 758 Type N connectors.
Kit Includes:
Qty Description
759 Type N Male to Type N Male adapter
75€ Type N Female to Type N Female adapter
7582 Type N Male short circuit
758) Type N Female short circuit
Type N Male 75 termination
Type N Female 7582 termination
1 Storage Case
Dimensions: 168 mm wide, 114 mm deep, 51 mm high
(6-5/8in. x 4-1/2 in. x 2 in.).
Weight: Net: 0.91 kg (2 1b). Shipping: 1.36 kg (3 1b).
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Al-14
Model 8505A
General Information
8505A TEST SET AND ACCESSORY RECOMMENDATIONS
Be... | Can be ordered as 11600B/11602B Option 003
Three SO to 75 £ Minimum Loss Pads provided with 11852A, one Minimum Loss Pad provided with 8502B.
Table Al-3. Test Sets and Accessories (7 of 7)
TRANSISTOR TRANSMISSION! TRANSMISSION
S.PARAMETERS lg psp AMETERS REFLECTION MEASUREMENTS
oro Type N (50 02) Type N (50 £2) Type N (50 ©)
1 BNC (5 BNC (50 £2) BNC (50 £2)
HPAC-2G0 (50 9) ;
cé Type N (75 0) Туре № (75 ©)
8505 А
Network Analyzer
S502A
50 Transmission/
Reflection Test Set
85028
75 © Transmission/
Reflection Test Set
11850A
5G © Power Splitter
118508
15 © Power Splitter
8503A
50 57 S-Parameter
Test Set
11600B
Transistor Fixture
116028
Transistor Fixture
¡| 608A Option 007
Stripline Transistor
Fixture
11608A Option 003
Stripline Transistor
Fixture
FISSTA
RF Cable Kit
11852A
50.0 to75 80
Minimum Loss Pad
11853A
56 22 Туре №
Accessory Kit
11854A
50 Q BNC
Accessory Kit
PI8BSSA
75 Type N
Accessory Kit
11857A
Test Port Extension
Cables
11858A
Rigid Interconnect
Adapter
850324
50 Q Type N
Calibration Kit
Al-15
General Information
Table Al-4. Recommended Test Equipment (1 of 3)
Model 8505A
Instrument Recommended Critical Specifications Use*
Model
Electronic Counter HP 5340A Freq Range: 400 kHz to 5.52 GHz PAT
Accuracy: El count
Sensitivity: --5 dBm
Power Meter and HP 43SA/B482A/ Freg Range: 500 kHz to 1300 MHz PAT
Sensor 3434 À or Power Range: +20 to —60 dBm
НАЗВА 8482A/ Accuracy: +0.5 dB at 1300 MHz
Spectrum Analyzer HP 141T/8552B/ Freq Range: 500 kHz to 5.5 GHz PAT
8553B/85S5A Impedance: 50 ohms
Dynamic Range: 60 dB
Frequency identification capability
Oscilloscope HP 180C/1801A/ Vertical Bandwidth: 20 MHz minimum AT
1820A/1804A Vertical Sensitivity: 5 mV/Div
Horizontal Sweep Rate: 1 us/Div
Channels: 4 (with 1804 A plug-in}
Digital Voltmeter, HP 3490A AC Range: 0 to 300V, 50 to 400 Hz AT
AC/DC DC Range: 0 to 200V
Accuracy: 45%
Resolution: to S digits
Function HP 3312A Output: +1V p-p square wave, 10 kHz and 100 kHz A
Generator Adjustable DC offset.
Spectrum Analyzer HP 8508A* Freg. Range: to 1300 mHz Р
Residual FM: < 3 Hz peak-to-peak
AM-FM Signal HP 8640A/B* Frequency: 5 — 500 MHz P
Generator Residual FM: < 5 Hz
Frequency Meter HP 5210A* Must have internal 12 kHz filter Р
RMS Voltmeter HP 3400A* True RMS Response: 1 mV-1V, 10 Hz to 10 MHz Р
Double Balanced HP 10514A% Frequency Range: 7 MHz to 500 MHz E
Mixer
40 dB Low Noise FP 08640-60506* Input/Output Impedance: 50 ohms P
Amplifier Low Frequency Response: 20 +4 Hz
Noise: < 3 dB
10 kHz Low-Pass HP 08505-60155= impedance: 50 ohms P
Filter Type: 5-pole Butterworth
| kHz Low-Pass HP 08505-60156* Impedance: 50 ohms Р
. Filter Type: 5-pole Butterworth
*H a Model HP 8568A Spectrum Analyzer is not available to make Spectral Purity tests, an alternate procedure may be
used using an 8640A/B, 5210A, etc.
Al-16
Model 8505A
General Information
Table Al-4. Recommended Test Equipment (2 of 3)
ended ns Es
Recomm Instrument Critical Specifications Use*
Model
3-Way Power HP 11850A Impedance: 50 ohms PAT
Splitter Freq Range: 500 kHz to 1.3 GHz
Connectors: Type N, female
Freq Response: Input to output <+0.2 dB
50-Ohm Trans- НР 8502 А No substitution PT
mission/Refiection
Test Set
Matched Type N HP 11851A 50-ohm double-shielded coaxial cables 61 cm (24 inches) PAT
Coaxial Cables long, phase matched to 2° at 1300 MHz
{3 required)
50-Chm Termina- НР 909 А Freq Range: 500 kHz to 1.3 GHz PA
tion (3 required) Option 012 Impedance: 50 ohms
Connector: Type N, male
SWR:< 1.4
10 dB Attenuator HP 8491B Attenuation: 10 dB +0.5 dB PT
SWR: < 1,3
50-Ohm Feed- HP 10100C Connector: BNC P
through
Termination
Type N Female HP 11511A P
Short
BNC to Type N HP 1250-0780 Impedance: 50 ohms p
Adapter
(2 required)
12-Pin (Dual 6 -Pin) HP 08505-60109 AT
Extender Board
Calibrated H89-355D Attenuation: 0 to 120 dB in 10 dB steps
Step Attenuator Standards lab calibrated at 20 MHz
Connectors: BNC
AC Probe HP 1121A No substitution A
Coaxial Step HP 8496A Attenuation: 0 to 110 dB in 10 dB increments P, A
Attenuator
SWR: 1.5
Connectors: Type N, male
Al-17
General Information Model 8505 A
Table A1-4. Recommended Test Equipment (3 of 3)
Recommended
Instrument Model Critical Specifications Use*
30-Pin (Dual 15- HP 08505-60041 AT
Pin) Extender
Board (2 required)
36-Pin (Dual 18-Pin) | HP 08505-60042 AT
Extender Board
(3 required)
50-Pin (Dual 25-Pin) | HP 08505-60108 AT
Extender Board
182.88 ст (72 НР 115004 50-0hm coaxial cable 182.88 ¢m long, terminated on Р
inches) Coaxial both ends with UG-21D/U type N Male connectors
Cable with Type N
Connectors
2 required)
15.24 plus Meters 30-ohm type RG 223/17 coaxial cable with BNC РА
(50 plus feet) of connectors on both ends
509 Coaxial Cable
Type N Right HP 1250-0176 р
Angle Adapter
Type N Male-to- HP 1250-0778 Impedance: 50 ohm p
Male Adapter
Type N Female- HP 1250-0777 Impedance: 50 chm P
to-Female
Adapter
Service Interconnect | HP 08505-60202 T
Cable 61 cm
(24 inches)
Signature Analyzer HP 5004 A No Substitute TT
Logic Pulser HP 546A No Substitute T
Logic Probe HP 545A No Substitute T
16-Pin IC Clip-on HP 1400-0734 Any IC Clip T
Connector
(6 required)
* P = Performance Test; A = Adjustment; T= Troubleshooting
A1-18
Model 8505A
CHAPTER A
SECTION
INSTALLATION & INCOW
A2-1. INTRODUCTION
A2-2. This section provides mstructions for set-
ting up the Model 8505A Network Analyzer on a
bench or installing it in a standard equipment rack.
Information about receiving Inspection, operation
verification, operating and storage environmental
limitations, and packing requirements for re-
shipment are also included.
A2-3. RECEIVING INSPECTION
A2- 4. Inspect the shipping container. If it or the
cushioning material 15 damaged, keep 1t until the
entire shipment has been checked for complete-
ness, and the mstrument has been checked
mechanically and electrically. Check the equip-
ment received in the shipment against the shipping
manifest and equipment illustrations in Section I.
Check the 8505A operation with the Incoming ín-
spection Tests in paragraph A2-49. If the shipment
is incomplete, or if the equipment is damaged or
will not pass the Incoming Inspection Tests, notify
the nearest Hewlett-Packard office. If, in addition,
the shipping container is damaged or the cushion-
ing material shows signs of stress, notify the carrier
as well as the Hewlett-Packard office. Keep the
shipping materials for the carrier's inspection. The
Hewlett-Packard office will arrange for repair or
replacement of damaged equipment without wait-
ing for a claim settlement.
A2-5. ENVIRONMENTAL LIMITATIONS
A2-6. Environmental limitations for the Model
8505A Network Analyzer are:
Temperature — 0° C to +55° C Operating;
—40° C to +75° C, stored or in shipment.
Altitude (Barometric) — To 4572 metres
(15 000 feet) operating. “To 15240 metres
(50 000 feet) stored or in shipment.
MODEL 8505A NETWORK £
Installation
il
ИМС INSPECTION
Humidity — To 95%, however, instrument
must be protected from temperature ex-
tremes that could cause condensation to form
in it.
А2-7. BENCH USE
A2-8. For bench use, the two chassis units of the
8505A are locked together with the lower unit
sitting on the bench or on an 8503 A S-Parameter
Test Set. On the rear corners of each chassis unit
there are feet which allow the units to be set down
front-panel up as long as no cables are connected
to the rear panel connectors. The bottom two feet
on the Signal Processor and display unit, and
the upper two feet on the Source/Converter
Frequency Control unit fasten together with
thumbscrews to lock the two units together at
the rear (See Figure A2-1). In the front, four
hook-shaped flanges on the top of the lower
unit engage corresponding slots in the top unit. To
fasten the two units together, proceed as follows:
a. Set the Signal Processor on top of the
Source/Converter-Frequency Control, with
the front edge of the Signal Processor over-
lapping the front edge of the bottom unit ap-
proximately 1/4-inch.
b. Slide the top unit back until its front edge is
even with the front edge of the lower unit.
This should lock the fronts of the two units
together. Make sure they are locked by lifting
up on the front of the top unit.
¢. Tighten the thumb-screws on the bottom rear
feet of the top unit into the top rear feet of the
bottom unit.
А2-1
Installation Model 8505A
REAR PANEL OF ~~" = BOTTOM LEFT
TOP UNIT | REAR LOCK FOOT
OF TOP UNIT
THUMB >
SEREW =
TIGHTEN
TO LOCK
TOP LEFT
REAR LOCK
FOOT OF
BOTTOM UNIT
REAR PANEL OF
BOTTOM UNIT |
Figure A2-1. Lock Feet, Left Side
A2-9. RACK MOUNTING mounting kit, Option 909, includes both the
rack-mounting hardware and the front handles.
A2-10. Two rack-mounting kits are available for Parts supplied with the two kits are listed in Table
the 8505A. One, Option 908, is for 8505A’s that do A2-1; the manner in which these parts attach to the
not have or need front handles. The other rack 8505 À is shown in Figure A2-2.
Table A2-1. Rack-Mounting Kits for 85054
Description HP Part Number Quantity
OPTION 908 (HP 5061-0077) Includes:
Rack Flange 5020-8862 4
Machine Screw, Pan Head, 2510-0193 12
8-32 x 0.375 inch
Option 909 (HP 5061-0083) Includes:
Handle Assembly 5060-9899 4
Rack Flange 5020-8874 4
Machine Screw, Pan Head, 2510-0194 12
8-32 x 0.625 inch
NOTE
Rack-mounting kits and other options are shipped with the instrument as part of
the original order only; they are not supplied separately. If you already have an
8505A and want to add the optional equipment, order the kit, assemblies, attach-
ing hardware or other materials you need by their HP Part Numbers, rather than
by option number, from your nearest HP office,
A2-2
Model 8505A
Installation
OPTION 908
RACK MOUNTING KIT
WITHOUT FRONT
HANDLES
side of instrument.
SIDE TRIM STRIP
HP 5001-0438 LEFT SIDE
(2 places each side INSTRUMENT
of instrument). Fa,
REMOVE FROM
7
%
(HP 5061-0077) INSTRUMENT 7 FRONT OF
BEFORE ATTACHING A AR) INSTRUMENT
RACK FLANGE FLANGE > ~~
HP 5020-8862 pe > à LÉ
Attach 2 on each - о | A Aw A
side of instrument, oo > A0 ; a NIC
Л pd | | <
PAN HEAD sp 2 a Pa 27
- E ==
Machine Screw и AC e . >
8-32 x 0.375" — 0 - |
HP 2510-0193 и Da ©
6 places on each 7 J AR
OPTION 909
RACK MOUNTING KIT
WITH FRONT
HANDLES
(HP 5061-0083)
RACK FLANGE
HP 5020-8874
(2 places on each
side of instrument).
PAN READ
Machine Screw
8-32 x 0.625"
HP 2518-0194
6 places on each
side of instrument.
*FRONT HANDLE
Trim Strip
HP 5020-8896
9
9
Ss
*ELAT HEAD
Machine Serew
8-32 x 0.375"
HP 2510-0195
Remove these flat head
machine screws and
trim strips if handles
already on instrument,
LLY
INSTRUMENT
Se =
+
FRONT OF
INSTRUMENT
&
DA
Ue
x
U
N
*FRONT HANDLE ASSEMBLY
HP 5060-9899
* THESE ITEMS SUPPLIED WITH
OPTION 907 (FRONT HANDLES
KIT). IF INSTRUMENT ALREADY
HAS FRONT HANDLES, ORDER
JUST THE PAN HEAD MACHINE
SCREWS (2510-0194) AND
FLANGES (5020-8874).
Figure A2-2. Attaching Rack Mounting Hardware and Handles
A2-3
Installation
A2-11, PRE-OPERATION SET UP
A2-12. Power Requirements
A2-13. The Model 8505A requires a power
source of 100, 120, 220, or 240 Vac, +5% — 10%,
50 to 60 Hz, single-phase. Power Consumption is
approximately 275 watts,
AZ-14. Line Voltage and Fuse Selection
WARNING |
BEFORE THIS INSTRUMENT IS
SWITCHED ON, its protective earth
terminals must be connected to the
protective conductor of the mains
power cable (cord). The mains power
cable plug shall only be inserted in a
socket outlet provided with a protec-
tive earth contact. DO NOT negate the
earth-grounding protection by using
an extension cable, power cable, or
autotransformer without a protective
ground conductor. Failure to ground
the instrument properly can result in
serious personal injury or death.
i CAUTION $
BEFORE SWITCHING ON THIS IN-
STRUMENT, make sure it is adapted
to the voltage of the ac power source.
You must set the voltage selector
cards correctly in both the top and
bottom units of the 8505A to adapt it
to the power source, Failure to set the
ac power inputs of the instrument for
the correct voltage level could cause
it to be severiy damaged when
switched on.
A2-15. Select the line voltage and fuses m both
the top and bottom units of the 8505 A as follows:
a. Measure the ac line voltage you will be apply-
ing to the 8505A.
b. See Figure A2-3. At each of the instrument’s
two rear-panel power line modules, select the
А2-4
Model 8505A
line voltage (100Y, 120Y, 220Y, or 240V)
closest to the voltage you measured in step a.
Note that the available line voltage must be
within +5% or —10% of the line voltage
selection as shown below. If it is not, you
must use an autotransformer between the ac
source and the 8505A.
Line Voltage Selection
90 to 105 Vac 100V
108 to 126 Vac 120V
198 to 231 Vac 220V
216 to 252 Vac 240V
с. Make sure the fuses in the power module fuse
holder are of the correct type and rating. Fuse
requirements for the different line voltage
selections are indicated next to the power
modules.
A2-16, HP-1B Address Selection
A2-17. The talk/listen address pair for the signal
processor/display is different than the talk/listen
address pair for the frequency control-source/con-
verter. The pre-set factory selected address pair for
the signal processor/display is Talk Address P
{Octal 120) and Listen Address ¢ (Octal 060); the
address pair for the frequency control-source/
converter is Talk Address S (Octal 123) and Listen
Address 3 (Octal 003). Before installing the HP-IB
interface assemblies, other talk/listen address pairs
shown in Table A2-2 may be selected. (The code
selected must of course be compatible with the sys-
tem.) The addresses are selected with switch SI on
the ASA21 and AZA!16 HP-IB Buffer Assemblies.
The numbers 1 through 5 on the two buffer assem-
blies correspond to by through bs respectively 10
Table A2-2. The address 1s selected by pressing the
A2-4.) The switches in Figure A2-4 are set to My
Listen Address (MLA) in the ASCII character "3"-
address code (Octal 063) or to My Talk Address
(MTA) in the ASCH alpha character = S§" (Octal
123).
A2-18. Cable Connections
A2-19. All cable connections to the 8505A, ex-
cept those to the device under test, are made at the
rear panels. The rear-panel connectors and their
reference designators are shown in Figure A2-5.
Model 8505A Installation
AZ2-20. Power Cable connected through the protective
conductor of the power cable to the
power source outlet socket protec-
tive earth contact. This protection
| WARNING |
if this instrument is to be energized must not be negated through the use
through an autotransformer, make of an extension cord (power cable)
sure the common terminal of the au- without a protective ground conduc-
totransformer is connected to the tor. Any interruption of the protective
protective earth contact of the power ground, inside or outside the 8505A,
source outlet socket. The protective can make the 8505A a dangerous
earth terminals of the 8505A must be electric shock hazard.
RECEPTACLE FOR PRIMARY POWER CORD
PC SELECTOR BOARD SHOWN POSITIONED
FOR 115/120 VAC POWER LINE.
SELECTION OF OPERATING VOLTAGE
OPERATING VOLTAGE APPEARS IN MODULE WINDOW. + SLIDE OPEN POWER MODULE COVER DOOR
aa AND PUSH FUSE-PULL LEVER TO LEFT TO
REMOVE FUSE.
2. PULL OUT VOLTAGE-SELECTOR PC BOARD.
POSITION PC BOARD SO THAT VOLTAGE
NEAREST ACTUAL LINE VOLTAGE LEVEL
WILL APPEAR IN MODULE WINDOW, PUSH
BOARD BACK INTO ITS SLOT.
3. PUSH FUSE-PULL LEVER INTO ITS NORMAL
RIGHT-HAND POSITION,
4, CHECK FUSE TO MAKE SURE IT IS OF COR-
RECT RATING AND TYPE FOR INPUT AC
LINE VOLTAGE. FUSE RATINGS FOR DiF-
FERENT LINE VOLTAGES ARE INDICATED
BELOW POWER MODULE,
5. INSERT CORRECT FUSE IN FUSEHOLDER,
Figure A2-3. Line Voltage Selection with Power Module PC Board
А2-5
installation
Table A2-2. Talk and Listen Addresses
Model 8505A
2”
Un
or
+
©
ta
с
2
or
Talk
Address
Character
Listen
Address
Character
Decimal
Value
== оно © © оо бо © н нон нон но — о © о ооо 0
Dl Da O OS O O OO
Da Da DA DA DR OD
О т ОЕ соло пог Aw >
)= ——NKXE<Aad
00
О}
02
03
04
05
06
07
08
09
10
11
12
13
14
iS
20
21
27
23
24
25
26
27
28
29
30
*Preset Address of Signal Processor.
**Preset Address of Frequency Control.
À 2-6
Model 8505A Installation
A2A16S1
A3A21S1
TOP
LSB*
oo MSB*
4
SWITCH POSITIONS! ?
LOGIC “17 «в — ze LOGIC 0” (ON)
(OPEN) (GROUND)
NOTES
|. Darkened side of switch is pushed in.
2. Switch is shown in ASCII code "3" for Listen Address or 'S' for Talk Address.
3. LSB - Least Significant Bit; MSB - Most Significant Bit.
4. Positions 6 and 7 are spares and disconnected on board.
Figure A2-4. HP-IB Address Switch
A2-7
Installation
Model 8505A
A3J1 A3/2 A3J3
A3J4 A3JE A315 A3J6 A3JO A3J7 A3J10
АЗ
HP-IB g
CABLE §
0.5 METRES J
HP 106310 |
AZJ18~
A244 A2J5 A236
HP-1B TO OTHER FREO. CONTROL/SIGNAL PROCESSOR
INSTRUMENTS INTERCONNECT CABLE
(HP PART NUMBER 08505-60231)
NOTE
ON 8505A NETWORK ANALYZERS HAVING SERIAL NUMBER PREFIXES 1544A AND LOWER, POSITIONS OF FRE.
QUENCY CONTROL INTERCONNECT RECEPTACLE A3J2 AND NORMALIZER INTERCONNECT RECEPTABLE A3J1 ARE
REVERSED SO THAT A3J2 IS LOCATED NEXT TO HP-IB CONNECTOR A3JT1.
A2-21,
Figure A2-5. 8505A Rear Panel Connectors
In compliance with international safety mine which cable is the correct one. Order the
standards, this instrument is equipped with a three-
wire power cable. When connected to a properly in-
stalled power line outlet, this cable grounds the
8505A chassis. Figure A2-6 shows the different
kinds of mains plugs available for the power cable
supplied with the 8505A. The number shown under
each plug is the HP part number for the 8505A
power cable with that particular kind of mains plug.
A2-22. The power cable supplied with the 8505A
is selected to be compatible with power line
outlet sockets in the country of destination.
If the cable you receive does not fit your power
line outlet sockets, refer to Figure A2-6 to deter-
А2-8
required cable by the HP Part Number shown
from the nearest Hewlett Packard office.
A2-23. Frequency Control-Signal Processor Inter-
connect Cable
A-24, Connect the Frequency Control-Signal
Processor cabie (HP Part No. 08505-60021) be-
tween FREQUENCY CONTROL INTER-CONN
receptacle A3J2 and SIGNAL PROCESSOR
INTER-CONN receptacle A2}J4 as shown in Fig-
ure AZ-5.
Model 8505A Installation
Cable Cable
HP Part Plug Length Cable For Use
Plug Type Number Description (inches) Color In Country
250V :
8120-1351 Straight*BS1363A 90 Mint Gray Great Britain ,
8120-1703} 90° 90 Mint Gray Cyprus, Nigeria,
Rhodesia,
Pi, Singapore,
» So. Africa, India
8120-1369 | Straight*NZSS198/ASC112 79 Gray Australia ,
8120-0696 | 90° 87 Gray New Zealand
8120-1689 | Straight*CEE7-Y11 79 Mint Gray East and West
8120-1692 90° 79 Mint Gray Europe, Saudi
Arabia, United
Arab Republic
{unpolarized in
many nations)
8120-13481 Straight*NEMAS-15P 80 Black United States,
8120-1398 | 90° 80 Black Canada ,
8120-1754 | Straight*NEMAS-15P 36 Black Japan (100 or
200\),
— 8120-1378 | Straight*NEMAS-15P 80 Jade Gray Mexico,
8120-1521, 90° 80 Jade Gray Phillippines,
8120-1676 | Straight*NEMAS-15P 36 Jade Gray Taiwan
8120-2104 Straight*SEV1QI1 79 Gray Switzerland
1959-24507
Type 12
250V 8120-0698 | Straight*NEMA6-15P
250V 8120-1860 | Straight*CEE22-VI
Е
* Part number shown for plug is industry identifier for plug only. Number shown for cable is HP Part
Number for complete cable including plug.
E = Earth Ground; 1. = Line; N = Neutral
Figure A2-6. AC Power Plug Connectors and Power Cable Part Numbers
A2-9
installation
A?2-25, Hewlett-Packard Interface Bus Cables
+ ¡il а a aT wong
* 7
q y
; |
: CAUTION 4
A ;
A $
Do not mate HP-IB silver and black
fasteners to each other. This device is
equipped with metric thread fasteners
(colored black). To avoid damaging the
threads, mate only with other metric
threaded devices. English threaded fast-
eners are colored silver.
A2-26. When the 8505A is used in automatic
mode, and is being controlled through the Hewlett-
Packard Interface Bus (HP-IB), the HP-IB intercon-
nect cables are connected as follows. The 0.5 metre
cable (HP 10631D) is connected between A2J10
on Frequency Control and A3J11 on Signal Proces-
sor. Another HP-IB cable is connected in "piggy-
back” fashion to one of the connectors and the
other end connected to the desk-top-computer,
test set, or other instrument in the system. Signal
lines in the HP-IB cables are identified in Figure
А2-7.
A2-27. As many as 15 instruments can be con-
“nected in parallel on the Hewlett-Packard Interface
bus, To achieve design performance on the bus,
proper voltage levels and timing relationships must
be maintained. If the system cable is too long or if
Model 8505A
the accumulated cable length between instruments
is too long, the data and control lines cannot be
driven properly and the system may fail to per-
form. Therefore, the following restrictions must be
observed:
a. With two instruments in a system, the
cable length must not exceed three meters
(9 feet).
b. When more than two instruments are con-
nected on the bus, the cable length to
each instrument cannot exceed two
meters (six feet) per unit.
c. The total cable length between all units
cannot exceed 20 meters (65 feet).
A2-28. Normalizer Interconnect Cable
A2-29. When an 8501A Normalizer is used with
the 8505A Network Analyzer, the Normalizer In-
terconnect Cable connects to NORMALIZER IN-
TER-CONN receptacle A3J1. Signal lines in the
Normalizer Interconnect Cable are identified in
Figure A2-8.
А2-30. Test Set Interconnect Cable
A2-31. When an 8503 A or B S-Parameter Test Set
is used with the 8505A, the Test Set Interconnect
SIGNAL GROUND 24
r P/O Twisted Pair with 11 23
Should be ground- P/O Twisted Pair with 10 22
ed near termina- P/O Twisted Pair with 9 21
tion of other wire — | p/O Twisted Pair with 8 20
of twisted pair P/O Twisted Pair with 7 i9
“P/O Twisted Pair with 6 18
REN 17
DIOS i6
DIO7 15
DIO6 14
DIOS 13
HP-I5 Logic Leveis:
True (low) State <O.8 Vde; False (high) State >+2.4 Vdc.
SHIELD -=e-Connected
ATN to earth
SRO ground by
IEC System
| Controller
NDAC
NRED
DAV
EOI
DIO4
D103
DIO?
DICI
pr eh A
E E M
br BD) EA ON E
Figure A2-7. HP-IB Connectors, A2J10 and A3J11 , Signals and Pin Configuration
A2-10
Model 8505A
Cable connects to TEST SET INTER-CONN recep-
tacle A3J3. Signal lines in the Test Set Intercon-
nect Cable are identified in Figure A2-9,
A2-32. Recorder Output Connections
A2-33. BNC connector receptacles A3J4 through
A3J7 furnish channel 1, channel 2, X-axis sweep,
and pen-iift outputs which can be applied to an
X-Y recorder. See Table Al-2, Auxiliary outputs,
for output signal characteristics. See Table A2-3
for outputs with various combination of front-
panel control settings.
A2-34. Display Input Connections
A2-35. BNC connector receptacles A3J8 through
A3JIO can be used to apply signals from external
sources to the Signal Processor CRT display.
A2-36. AM Input Connection
A2-37. BNC connector receptacle A2J5 (AM IN-
PUT) enables an external signal to be applied to
the Source/Converter ALC control circuit to amp-
litude-modulate the RF signal.
A2-38. External Trigger Input Connection
A?2-39. BNC connector A2J6 (EXT TRIGGER)
enables the Frequency Control sweep to be trig-
gered from an external source when the Frequency
Control assembly s front-panel TRIGGER switch
is set to EXT.
A2-40. PREPARATION FOR RESHIPMENT
A2-41. Original Packaging
A2-42, If you must reship the 8505A and you
have not retained the original packing materials,
the same kinds of containers and materials used for
the original shipment can be obtained through the
nearest Hewlett-Packard Sales or Service office.
See Figure A2-10.
А2-43. If the instrument is being returned to
Hewlett-Packard for servicing, attach a tag indi-
cating the service required, return address, instru-
ment model number (1.е., 8505A), and the instru-
ment's full serial number. Mark the container or
containers FRAGILE to ensure careful handling.
A3-44. In any correspondence, refer to the instru-
‘ment by model number and its full serial number.
installation
A2-45. Other Packaging Materials
A2-46. The following general instructions should
be followed when repackaging with commercially
available materials:
a Wrap the instrument in heavy paper or plas-
tic. If you are shipping the instrument to a
Hewlett-Packard Service office or center, at-
tach a tag indicating the kind of service re-
quired, return address, model number, and
full serial number.
b. Place the wrapped instrument in a strong
shipping container, A doubie-wall carton
made of 350-pound test material is adequate.
с. Place enough shock-absorbing material (a
three-inch to four-inch layer) around all sides
of the instrument to provide a firm cushion
and prevent any movement of the instrument
inside the container,
d. Seal the shipping container or containers
carefully and mark it or them FRAGILE to
ensure careful handling.
A2-47. INCOMING INSPECTION TEST
A2-48. These procedures test the salient specifica-
tions of the instrument and should be used for in-
coming inspection. They functionally test all major
operating modes, and test the major specifications
of the instrument. If certification is required, use
the more lengthy procedure in Section IV, which
tests ail of the detailed specifications of the instru-
ment.
A2-49, EQUIPMENT REQUIRED
A2-50. The equipment required to perform the
incoming inspection is listed in Table A2-4 and
shown in Figure A2-11. 1f substitution is necessary
for any of the equipment, the alternate models
must meet or exceed the critical specifications.
(Text continued on page A2-19)
A2-11
Installation
Model 8505A
CHANNEL 1
FILTER
CHANNEL 2
NORMALIZER INTERCONNECT RECEPTACLE A3J1
AS VIEWED FROM REAR OF INSTRUMENT
O
RECT POSN 1
RECT POSN 2
POL POS X
POL POS Y
Al
AZ
FILTER LOFFCH 1
LOFFCHZ
тие) С os
BP3
X NORM Ad UBP
RECT X POS
V SW 2
Y NORM AS L POLAR
MP (MARK PULSE)
Z MOD NORM AB OM (DATA MARKER)
SW ALT
SPARE
Z TTL NORM AT PL (PEN LIFT)
O
MNEMONICS TABLE
Pin Mnemonic Description
| RECT POSN 1 Rectangular position, Channel |
2 RECT POSN 2 Rectangular position, Channel 2
3 POL POS X Display Polar Offset, X axis
4 POL POS Y Display Polar Offset, Y axis
5 LOFF CH Channel 1 on/off to Normalizer. Low = off
6 L OFF CH 2 Channel 2 on/off to Normalizer. Low = off
7 IL, NORM Normalizer inputs enable. Low = inputs enable
8 BP3 Blanking Pulse 3
9 DBP Display Blanking Pulse. High = blank
10 RECT X POS Rectangular X Position
|1 V SW 2 Sweep voltage to +13 Vdc to Signal Processor
12 L POLAR Low polar alternate. Low = polar display
13 MARK PULSE Marker pulse to Normalizer. High = display marker
14 DATA MARKER Data marker, High = display marker and measure
15 SW ALT Sweep alternate, Signal Processor to Normalizer
High = Channel 1, Low = Channel 2
16 SPARE
17 PL Pen lift
Figure A2-8. Normalizer — 8505A Interconnecting Signal Lines and Receptacle Terminals
A2-12
Model 8505 À
Installation
TEST SET INTER-CONN {A3J3)
AS VIEWED FROM REAR OF INSTRUMENT
V SW 2 O1
LEV SW BLNK { 98 } -02 КО
LEV SW EN O3 o
LEV SW { 938 } O4 170
LOGRA O5 180
TEST SET { 946) O6 190
L SNGL O7 200
LEXT 1 { 948) -08 210
LIN AB/R O9
010220
230
Ott
SIGNAL PROCESSOR 010
ASSEMBLY GROUND 250
O13
MNEMONICS TABLE
Pin Mnemonic Description
1 V SW 2 Sweep voltage independent of frequency or mode
2 LEV SW BLNK Level sweep blanking
3 LEV SW EN Level sweep enable
4 LEV SW Level sweep
5 ГОС К Log magnitude of input R
6 TEST SET Test Set (8503A) control line
7 L SNGL Low Single sweep (Return to LOCAL)
8 LEXTI External signal control line
9 LIN AB/R Linear ratio output of A or B over R
Figure A2-9. 8503A S-Parameter Test Set — 8505A Interconnecting Signal Lines and Receptacle Terminals
A2-13
Installation
Model 8505A
Table A2-3. Rear Panel Recorder Quiputs with Combinations of Front-Panel Settings
Channel 1 OFE MAG A or МАС Вог MAG R PHASE A/R | PHASE B/R | POLAR A/R
ar or or
MODE MAG A/R | MAG B/R DELAY A/R | DELAY B/R | POLAR B/R
Channel 2 MODE OFF
Consecutive |
Sweep Number* 1 2 1 2 i 2 1 | 2 1 2 1 2 1 2
Hear Panel CHI 0 9 e vi Y1 Yi УД vi vi vi Yi Y! YiP {1 YIP
RECORDER cHS 9 G 0 0 @ 0 0 G 0 3 9 0 XiP 1! XIP
DUTPUTS SWR Xx X X A X xX À À X xX X X XP | XP
Channel 2 MODE MAG A or MAG A/R
Rear Panel CHL 6 0 Yi Yi Yi 0 Yi Y1 Y1 Yi Y1 0 Y1P Ö
RECORDER СН? | У? Y2 Y2 Y? 0 Y1 Y? Y 2 Y2 Y 2 0 Y2 XiP Y2
QUTPUTS swp X X X X X X X X X X X X XiP X
Channel 2 MODE MAG B or MAG B/R
Rear Panel CHI G 0 Yi 0 Y1 Y 1 Y1 YI Y1 G Y1 Y1 YIP 9
RECORDER CH2 | Y?2 Y2 0 Y? Y2 Y2 0 У @ Y2 va Y2 X1P Y2
OUTPUTS SWP Xx X Xx X X À X X X Xx X X X1P X
Channel 2 MODE MAG RB
Rear Panel CHL @ 0 Y1 Yi Yi G Y1 Yi Yi Yi Y1 0 Y1P 0
RECORDER CH2 Y 2 Y? Y2 va Y2 Y2 Y2 ya Y2 Y2 Y? Y2 XIP Y2
OUTPUTS SWP X X X X X À xX X X X X X X1P X
Channel 2 MODE PHASE A/R or DELAY A/R
Rear Panel CH1 @ 0 Y1 Yi Yi 0 Y1 bal Y1 Yi Yi 0 Yip 0
RECORDER CH2| Y2 | Y2 | Y2 | Y2 | 9 Y2 Y Y2 v2| Y2 | e | Y2 | XIP| vo
QUTPUTS swP x X X X X X X X X X X X X1P X
Channel 2 MODE PHASE B/R or BELAY B/R
Rear Panel CH1! 9 90 | y | 0 | vi | vi] vi] vi vi| 0 | vil! vi] vir] €
RECORDER cH?2 Y 2 у 0 Y2 Y2 Y? 0 Y2 0 | Y2 Y2 Y2 XiP Y2
OUTPUTS SWR X X X X X X X À X X X x XiP X
Channel 2 MODE POLAR A/R or POLAR B/R
Hear Panel CHI Y2P | Y2P Yi Y2P Yi Y2P Y1 Y2P Yi Y2P Yi Y2P! Y1P | Y92P
RECORDER CcH2 | X2P | Хор 0 Х2Р 0 X2P 0 XP 0 x2P 0 X2Pi XI1P | X9P
QUTPUTS SWR| X2P X2P X X2P À X3P X X2P X X2P x X2P: XI1P | X2P
Abbreviations:
X = Rectanguiar X, both channels
X1P = Polar X, channel 1
A2P = Polar X, channel Z
Yi = Rectanguiar Ÿ, channel 1
\ 2 = Rectangular Y, channel 2
Y1P # Polar Ÿ, channel 1
Y2P = Polar Ÿ, channel 2
0 = Invalid Output
*Recorder outputs are multiplexed between channel 1 and channel 2 for certain combinations of mode and input settings. This causes the out-
puts to change on alternate sweeps from channel 1 to channel 2. If the entries in the table for I and 2 are the same, the outputs are the same
for each sweep, However, if the entries are different for 1 and 2, the outputs are different for alternate sweeps,
А2-14
Model 8505A
Installation
(8 PLACES)
©
(2 PLACES)
00
N (2 PLACES)
Hem Oty HP Part No. Description
© 16 9220-2732 FOAM PADS—TOP, CORNER; BOTTOM CORNER
© 2 9211-2729 CARTON-INNER
© 4 5021-1722 BARS-SHIPPING, ALUMINUM
о 8 2510-0061 SCREW-FOR ATTACHING SHIPPING BARS
O 2 9211-2730 CARTON--OUTER
O 4 9220-2775 SIDE PADS, CORRUGATED CARDBOARD
NOTE: Quantities given are for two containers.
Figure A2-10. Packaging for Shipment Using Factory Packaging Materials
A2-15
Type-N to BNC
Adapter
(2 required)
15.24 plus Meters
(50 plus feet) of
Coaxial Cable
10 dB Attenuator
Connectors: Type N Male
SWR: < 1.4
50-ohm type RG 223/U coaxial cable
with BNC male connectors on
both ends
Attenuation: 10 dB +0.5 dB
SWR: < 1.3
Installation Model 8505 A
Table A2-4. List of Equipment Required for Incoming Inspection Test
Recommended
Instrument Critical Specifications Model
Electronic Counter Frequency Range: to 10 MHz HP S340A
Accuracy: +1 count
Sensitivity: —5 dBm
Power Meter and Power Range: +10 to —20 dBm HP 435A/8482A
Sensor Frequency Range: 0.5 to 1300 MHz
Accuracy: £0.5 dB at 1300 MHz
G — 110 dB Step Attenuation: O to 110 dB in 10 dB HP 8496A
Attenuator increments
Frequency: Calibrated at 30 MHz
SWR: < 1.5
Connectors: Type N Male
3-Way Power Impedance: 50 Ohms HP 11850A
Splitter Frequency Range: 0.5 to 1300 MHz
Connectors: Type N Female
Frequency Response: Input to output
<+0.2 dB
Matched Coaxial 30-ohm double-shielded coaxial cables HP 11851A
Cables (Set of 3) 61 cm (24 inches) iong, phase
matched to 4° at 1300 MHz
Connectors: Type N Male
50-Ohm Termina- Frequency Range: 0.5 1300 MHz HP 909A
tion (3 Required) Impedance: 50 Ohms Option 012
HP 1250-0780
HP 84918
Option 010
A2-16
Model 8505A Installation
8505A NETWORK
ANALYZER ELECTRONIC COUNTER
MATCHED COAXIAL CABLES
{3 Required}
НЕ 1 POWER
SENSOR
= = ol)
С 0
50-OHM
TERMINATIONS
{3 Required)
220) 1 CH)
O — 110 dB STEP 3-WAY POWER 10 dB ATTENUATOR
ATTENUATOR SPLITTER
co [О
50 FT COAXIAL CABLE TYPE-N TO BNC ADAPTERS
{2 Required}
a E.
Figure A2-11. Equipment Required for Incoming Inspection Test
A2-17
Installation Model 8505A
A2-51. FREQUENCY RANGE AND ACCURACY TEST
NOTE
Allow one hour warm-up time before making the incoming
inspection.
SPECIFICATIONS:
CW Mode Accuracy = 2 counts of LSD = time-base accuracy*
Swept Frequency Accuracy: +1% of range for linear sweep
Counter Accuracy: +2 counts + time-base accuracy *
* Time-base Accuracy = 5 ppm +1 ррпу/°С +3 ppm/90 days.
DESCRIPTION:
The 8505A built-in frequency counter calibration is checked against a known good elec-
tronic counter by monitoring the CW RF signal. In CW +AF mode, the FREQUENCY
READOUT is compared to the counter readout. If necessary, the CW RF signal is adjusted
to match the FREQUENCY readout. This calibrates the digital FREQUENCY readout to
the actual RF OUTPUT signal being read on the built-in counter. The START/STOP sweep
signal frequency is measured using an external counter to monitor the frequencies with
both START and STOP frequencies the same,
B505A NETWORK ANALYZER ELECTRONIC COUNTER
INPUT
OUTPUT
; + CCO|FTZ |
10 98
ATTENUATOR
LI y
Figure A2-12. Frequency Accuracy Test Sefup
EQUIPMENT:
Electronic Counter ...... en HP 5340A
10 dB Attenuator..................... HP 8491B Option 010
A2-18
Model 8505A installation
A2-51. FREQUENCY RANGE AND ACCURACY TEST (Cont'd)
PROCEDURE:
COUNTER ACCURACY
a. Set 8505A Controls as follows:
On Al Source/Converter
OUTPUT LEVEL dBm ......... i, —10
OUTPUT LEVEL VERNIER ..... aaa. a 0
On A2 Frequency Control:
RANGE MHz .......... i. .3 — 1300
MODE... i ee LIN EXPAND
WIDTH .......... 0. ececeerareeorerdorerececarere CW
SCAN TIME SEC... i. 10 — 1
VERNIER SCAN TIME ........................ Clockwise
TRIGGER ee cae AUTO
MARKERS | ea 1
Marker 1 1.100010 RR KK Mid position
b. Connect equipment as shown in Figure A2-12 and set external counter resolution to
100 Hz.
с. Set CW FREQUENCY control and VERNIER control for 10.000 MHz indication on
external Electronic Counter. The 8505A CW FREQUENCY digital display should
indicate 0010.00 MHz 0.02 MHz. (If the indication is not within tolerance, the
built-in counter is malfunctioning; go to troubleshooting in Chapter C.)
FREQUENCY CALIBRATION
d. Set A2 Frequency Control WIDTH switch to CW AF,
e. Set CW FREQUENCY to 10 MHz and set CW FREQUENCY VERNIER to 0.
f. Set =AF FREQUENCY to 000.0, and set =AF FREQUENCY VERNIER to 0.
g. Remove the front-panel window of A2 Frequency Control (Figure A2-13).
h. Adjust FREQUENCY CALIBRATE (.5 — 1300 MHz) screwdriver adjustment in the
middle of exposed subpanel so the FREQ COUNTER MHz reads 10.00 MHz plus or
minus 2 counts of least significant digit (LSD).
i. Reinstall the window.
SWEPT FREQUENCY ACCURACY
j. At A2 Frequency Control, set RANGE MHz switch to .5 — 1300, MODE switch to
LIN EXPAND, WIDTH switch to START/STOP 1, and SCAN TIME SEC switch to
.1—.01. Set RANGE MHz switch and START and STOP frequency as listed in Table
A2-5 below and read the frequency on the internal counter.
А2-19
Installation Model 8505A
A2-51, FREQUENCY RANGE AND ACCURACY TEST (Conta)
FREQUENCY CALIBRATE (.5 — 1300 MHz)
LOCK TAB (RF QUTPUT FREQUENCY ADJUSTMENT) PLASTIC WINDOW LOCK TAB
[В MOVE LOCK TABS TO LEFT ABOUT 1/2 INCH
UNTIL THEY UNLATCH WINDOW.
2. REMOVE WINDOW BY PULLING OUT ON
LOCK TAB.
Figure A2-13. Freguency Control Front-Panel Window Removal
Table A2-5, Frequency Accuracy Table
START and STOP FREQUENCY
RANGE MHz Switch Set At Digital Readout Set At Frequency Indicated On
AZ Frequency Control AZ Frequency Control Internal Freq Counter
‚5 — 1300 1300. MHz 1300 MHz + 13 MHz
‚5 — 130 130.0 MHz 130.0 MHz £ 1.3 MHz
‚5 — 13 13.00 MHz 13.00 MHz £ 0.13 MHz
.5— 1300 0100. MHz 0100. MHz + 13 MHz
‚5 — 130 010.0 MHz 010.0 MHz + 1.3 MHz
‚5 — 13 01.00 MHz 01.00 MHz + 0.13 MHz
А2-20
Model 8505A installation
A-52, POWER QUTPUT LEVELING TEST AND ABSOLUTE POWER CALIBRATION
SPECIFICATION:
Power Output Range: +10 dBm to —72 dBm
Attenuator Accuracy: +1.5 dB over the 70 dB range
Output Leveling: +0.5 dB from 0.5 to 1300 MHz
Output Level Vernier Accuracy: +1 dB
DESCRIPTION:
The power output is measured directly with a power meter.
The power output is monitored on a power meter while the frequency band is tuned with
CW FREQUENCY control. The highest and lowest power spots are noted and the total
difference must be less than the specification.
8505A NETWORK ANALYZER
DUTPUF | > |
+ © о о | 5 E
POWER
SENSOR
si ,
Figure A2-14. Power Output Range Test Setup
EQUIPMENT:
Power Meter .............0..:0.. e recreco enana HP 435A
Power Sensor 202101004004 a 44 ea 4 a 4 a aa a aa 40 HP 8482 À
PROCEDURE:
POWER OUTPUT RANGE
a. Set 8505A controls as follows:
On Al Source/Converter:
OUTPUT LEVEL dBm ............ iii. +10
OUTPUT LEVEL Vernier ..............e.re0recereea KG 0
On A2 Frequency Control: |
RANGE MHz... ooo ce о ‚5 — 1300
MODE... ROM LIN EXPAND
WIDTH i ee ee CW
SCAN TIME SEC 121222400404 eee a ea a eee» | — 1
CW FREQUENCY MHz ........ coil, 30.0 MHz
А2-21
Installation Model 8505A
A2-52. POWER OUTPUT LEVELING TEST AND ABSOLUTE POWER CALIBRATION
(Cont'd)
b. Connectequipment as shown in Figure:A2-14 and set Power Meter range to +15 dBm.
¢. Measure power output at the OUTPUT LEVEL dBm settings of +10 dBm to —20
dBm. All readings should be within +1.5 dB + tolerance of power meter. (The HP
435A/8482 A power meter has an uncertainty of +0.4 dB.)
OUTPUT LEVEL VERNIER
d. Setpowermeterto -+15dBmrange. Set OUTPUT LEVEL dBm switchto -++10 dBm.
e. Turmnthe OUTPUT LEVEL dBm VERNIER from 0 to —12 dB position and the power
meter indication should change by —12 dB + | dB = tolerance of power meter used. (If
slightly out of tolerance, go to Paragraph A5-14 for adjustment.)
POWER LEVELING
f. While watching the power meter, turn the CW FREQUENCY control through the
entire band. The total variation between the highest power and the lowest power
indication across the band should be <1 dB (or 0.5 dB).
A2-53. CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR
SPECIFICATION:
Crosstalk Error Limits: > 100 dB isolation between inputs.
Noise floor in 10 kHz Bandwidth: —95 dBm (0.5 to 2 MHz) | К
—100 dBm (2 to 10 MHz)
— 110 dBm (10 to 1300 MHz)
DESCRIPTION:
The noise floor is measured by offsetting the reference line —95 dB (0.5 to 2 MHz), —100dB
(2 to 10 MHZ), and —110 dB (10 to 1300 MHz).
In the Crosstalk Isolation test, a signal of —10 dBm is applied to the "R'’ Channel input.
The "A" and "B" Channels are terminated and the signal is displayed on the CRT. The
displayed signal of Channel "A" should be 100 dB below the —10 dBm level of the "R'"'
port showing isolation between ports. The other ports are checked in the same manner.
8505A NETWORK ANALYZER
output | © € e
— 500
TERMINATIONS
Figure A2-15. Crosstalk Isolation and Noise Floor Test Setup
EQUIPMENT:
50 Ohm Termination (3 required)... 110100101111 12, HP 909A Option 012
A2-22
Model 8505A Installation
A2-53. CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR (Cont'd)
PROCEDURE:
a. Connect equipment as shown in Figure A4-15 with the three terminations on A, B,
and R ports.
b. Set 8505A Controls as follows:
On Al Source/Converter:
OUTPUT LEVEL dBm ...................... —60 dBm
OUTPUT LEVEL VERNIER ........ .. ........... 0 dB
INPUT LEVEL dBm MAX ................... -30 dBm
On A2 Frequency Control:
RANGE MHZ . areaenoarararoron 0.5— 13
MODE... ... 4 ea La LL aa LL LIN EXPAND
WIDTH ... eaaadoremor START/STOP 1
START FREQUENCY ... a 00.50 MHz
STOP FREQUENCY... ae 02.00 MHz
MARKERS aaa onoradenreorerov, 1
Marker 1... aaron Center of CRT
SCAN TIME SEC . LL LL 10 —1
SCAN TIME Vernier... ................ Fully Clockwise
TRIGGER... aoaaoedócede, AUTO
On A3 Signal Processor:
Channel 1
le INPUT. LL. LL LL LL Lee eat a a a La 8
1(0))) . ....... PARA MAG
SCALE/DIV LL LL LL LL 10 dB/DIV
Channel 2
MODE... eaeaoanenenarra aer, OFF
CRT Display
BANDWIDTH kKHZ .... . . .. . ...... 10 kHz
VIDEO FILTER ©... ea LL LL ON (in)
NOISE FLOOR FROM 0.5 to 2 MHz
с. Connect 50-Ohm terminations to 'R', A", and "B" ports. On Signal Processor Dis-
play, press REF LINE POSN, then adjust CHI control to place the CRT reference
trace on the center graticule line. Press REF LINE POSN again for normal operation.
d. At Channel 1, press DISPLAY REF, then CLR pushbutton until REL light goes out
(if it was lit). Set INPUT switch to A, repeat above procedure, then set INPUT
switch to B and repeat above procedure. Return Channel | INPUT switch to R
position.
e, At Channel 1, press REF OFFSET pushbuttons to obtain —95 dB offset. The CRT
trace should bé below the center graticule line. This shows the noise floor below
—95 dBm.
Е. Set Channel 1 INPUT switch to "A". The CRT trace should be below the center
graticule line.
g. Set Channel 1 INPUT switch to 'B'. The CRT trace should be below the center
graticule line. A2-23
Installation Model 8505A
A2-24
A2-53. CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR (Cont'd)
NOISE FLOOR FROM 2 TO 10 MHz
h. Set START frequency to 02.00 MHz and STOP frequency to 10.00 MHz. At Chan-
nel 1, press DISPLAY REF, then REF OFFSET pushbuttons to obtain —100 dB
offset. The CRT trace should be below the center graticule line. This shows the noise
floor below —100 dBm.
i. Set Channel 1 INPUT switch to “A”. The CRT trace should be below the center
oraticule line.
i. Set Channel 1 INPUT switch to "R'. The CRT trace should be below the center
graticule line.
NOISE FLOOR FROM 10 TO 1300 MHz
K. Set RANGE MHz switch to .5 — 1300 MHz. Set START frequency to 0010 MHz
and STOP frequency to 1300 MHz. At Channel 1, press DISPLAY REF, then REF
OFFSET pushbuttons to obtain —110 dB offset. The CRT trace should be below the
center graticule line. This shows the noise floor below —110 dBm.
i. Set Channel 1 INPUT switch to "A''. The CRT trace should be below the center
graticule line.
m. Set Channel 1 INPUT switch to "B'. The CRT trace should be below the center
graticule line.
CROSSTALK ISOLATION
n. On A1 Source/Converter, set INPUT LEVEL dBm MAX to -10 dBm.
O. Connect equipment as shown in Figure A2-15, with RF OUTPUT cable connected
to 'R' input and the two 50-Ohm terminations to "A" and "B" input ports. Set
OUTPUT LEVEL dBm switch to —10 dBm.
р. At Channel 1, press DISPLAY REF, then REF OFFSET pushbuttons to obtain
—110 dB of offset. Set INPUT switch to ‘A''. The CRT trace should be below the
center graticule line for 100 dB of isolation.
q. At Channel 1, set INPUT switch to "B"" and the CRT trace should be below the
center graticule line. |
Г. Move the RF OUTPUT cable to A" input port and connect the two 50-Ohm term-
inations to 'R' and 'A'” input ports. Set INPUT switch to "R" and the CRT trace
should be below the center graticule line for 100 dB of isolation.
S. At Channel 1, set INPUT switch to A” and the CRT trace should be below the cen-
ter graticule line.
PRN
Model 8505A installation
A2-54, MAGNITUDE DYNAMIC ACCURACY TEST
SPECIFICATION:
Magnitude Dynamic Accuracy: 0.01 dB/dB from —20 to —40 dBm
-0.2 dB from —10 to —50 dBm
0.5 dB from —50 to —70 dBm
1
2 dB from —90 to — 100 dBm
+4 dB from — 100 to — 110 dBm
rrr
INTA NA A
+ + +
DESCRIPTION:
The signal level into the receiver is adjusted by setting the external step attenuator. The
signal trace is monitored on the CRT and deviation from the expected position of the trace
on the graticule 1$ noted.
8505A NETWORK ANALYZER
OUTPUT PO ©
es ms
as
a) = a # : o
green farsi | Pr 5 0 Sm ET
-
STEP
ATTENUATOR
Figure A 2-16. Dynamic Range Test Setup
EQUIPMENT:
0 — 110dB STEP ATTENUATOR
(calibrated at 30 MHz) .......... cca HP 8496A
PROCEDURE:
a. On 8505A, set the controls as follows:
On Al Source/Converter:
OUTPUT LEVEL dBm ........... 0.000 x0s00r rie IA 0
OUTPUT LEVEL Vernier ..............0000recrr reee 0e 0
INPUT LEVEL dBm MAX... G —10
On A2 Frequency Control:
RANGE MHz. .... oa +5 — 13:
MODE EEES LIN EXPAND
WIDTH .............rrresecrrereorecre dare recrea CW
CW FREQUENCY .... coins 30.0 MHz
A2-25
Installation
A2-54. MAGNITUDE DYNAMIC ACCURACY TEST (Cont'd)
On A3 Signal Processor:
Channel 1
INPUT RR a da a a aa na R
MODE 11114414 LL 4 44 44 ee 4 da da a aa a MAG
SCALE/DIV ea A ad aa aa Re 5 dB
Channel 2
MODE 11102100 Lee V4 ed de Ad aa An da da an OFF
Electrical Length
MODE © ву 2.2 кк в улик иу ууу уве ки уу аоовивень, OFF
Display Section |
BANDWIDTH KHZ ........ 10 kHz ON (in)
REFLINEPOSN .......... .. Ref line to center graticule line
VIDEO FILTER 2..2... aaa ON (in)
b. Connect equipment as shown in Figure A2-16.
Model 8505A
с. Set step attenuator to 30 dB. Press Channel | DISPLAY MKR, then ZRO push-
buttons until trace settles. Press CHAN | DISPLAY REF pushbutton. As attenuator
is stepped down, offset ~10 dB/step with Channel 1 REF OFFSET pushbutton to
bring trace back to reference line within limits shown in Table A2-6. (It may be
necessary to change CHAN 1 SCALE/DIV to a less sensitive setting if trace is off
screen.)
d. Repeat step ¢ with attenuator connected to ""A'" input and Channel 1 INPUT switch to
Ti ti
A.
e. Repeat step c with attenuator connected to 'B' input and Channel 1 INPUT switch to
"RT
Table A2-6. Dynamic Accuracy Table
External Attenuator Setting
Channel 1 REF OFFSET
OFFSET from REF LINE
{Plus attenuator tolerance)
10 dB
20 dB
30 dB
40 dB
50 dB
60 dB
70 dB
30 dB
90 dB
100 dB
110 dB
+20.0 dB
+10.0 dB
0 dB
—10.0 dB
—20.0 dB
-30.0 dB
—40.0 dB
—50.0 dB
—60.0 dB
—70.0 dB
—80.0 dB
+ 0.20 dB
+O1 dB
+ 0.00 dB
+ 0.1 dB
+ 0.2 dB
+ 0.4 dB
+06 dB
+08 dB
+ 1 dB
+ 2 dB
+4 dB
А2-26
Model 8505A Installation
A2-55. PHASE DYNAMIC RANGE
SPECIFICATION:
Phase Dynamic Accuracy (in 10 kHz Bandwidth):
+0.02 degree/dB from —20 to —40 dBm
+0.5 degree from —10 to —50 dBm
+1 degree from —30 to —70 dBm
+3 degrees from —70 to —90 dBm
DESCRIPTION:
A phase reference level 1s established on the CRT. Then the signal at the receiver 1s
changed through the dynamic range of the instrument and the change in phase indication 1s
noted.
8505 NETWORK ANALYZER
OUTPUT © `
\
COAXIAL
CABLES
POWER SPLITTER
Figure A2-17. Phase Dynamic Range Test Setup
EQUIPMENT:
RF Cable Kif...... KK HP 11851A
3-Way Power Splitter.. 120442410442 4440 44406 HP 11850A
Step Attenuator, 0—110dB ........ ee eee HP 8496A
PROCEDURE:
a. On 8505A, set controls as follows:
On A! Source/Converter
OUTPUT LEVEL dBm ....1202 1001441144 4 2 2 8 6 1 a 0 ea 000 +10
OUTPUT LEVEL VERNIER i 0
INPUT LEVEL dBm MAX ooo ee eee ieee es —10
On A? Frequency Control:
RANGF MHz 112111111144 AL 4 4 4 4 4 11 1006 5 — 130
MODE... 112010111044 144244 4 42 4 44e 0 0 4 4 400 LIN EXPAND
WIDIH ee CW + АЕ
SCAN TIME SEC eee en 1 — 01
CW FREQUENCY... i eee 30 MHz
+AF FREQUENCY . oo. RK 4 0 ae 1 ea eee 0 0 00.0
MARKERS 110111 111 LL 44 4 La 4 4 4 4 4 6 4 4 ea 4 ee a 4200 |
Marker 1... ee Center of CRT screen
А2-27
Installation Model 8505A
A2-55. PHASE DYNAMIC RANGE {Cont'd}
On A3 Signal Processor:
Channel 1
INPUT. LL 111111 LL LL A LR 4 4 4 A4 4 A A A A A 4 4 2 a a aa 44e A/R
MODE. . 110111001400 4 AL 4 AAA 4 A V4 A A La 4 4e 420 PHASE
SCALE/DIV LA LA a A aa aa ea 14e n 0 | degree
Channel 2
MODE. ..111 11044 4 4 44 4 A4 A AA LA 4 4 A A A A 4 44 4 4 4400» OFF
Electrical Length
MODE ee OFF
Display Section
BANDWIDTH KHz . ..... ii 10 kHz On (in)
VIDEO FILTER ©. ee eee ie On (in)
REF LINE POSN .............. Adjust Reference Line to CRT
center graticule line
b. Connect equipment as shown in Figure A2-17. |
c. Set external step attenuator to 10 dB. If "R' OVERLOAD light comes on, adjust
OUTPUT LEVEL VERNIER to clear overload. Press Channel I DISPLAY MKR, then
ZRO pushbuttons to place the CRT trace on the center graticule line.
d. Step external step attenuator from 10 to 50 dB position. (This applies —50 dBm to
ports "A" and "R".) The CRT trace should be within +0.5 degree of Reference Line.
e. Step the external attenuator from 50 to 70 dB position. (This applies —70 dBm to
ports "A" and "R".) The CRT trace should be within +1 degree of Reference Line.
f. Step the external attenuator from 70 to 90 dB position. (This applies —90 dBm to
ports "A" and "R".) The CRT trace should be within +3 degrees of Reference Line.
A256. MAGNITUDE, PHASE, AND GROUP DELAY FREQUENCY RESPONSE
SPECIFICATION:
Absolute Magnitude Frequency Response: <+1.5 dB
Magnitude Tracking Frequency Response: <+0.3 dB
Phase Frequency Response: <+3° from 0.5 to 750 MHz; <+5° from 750 to 1300 MHz
Group Delay Frequency Response: <+1 ns (0.5 to 1300 MHz).
DESCRIPTION :
The receiver magnitude frequency response is tested by applying the RF OUTPUT first
directly to the three individual ports. If the indication is slightly out of specifications, the
RF OUTPUT is sent through a power splitter to one of the INPUT ports and to a power
meter. The common mode power variations due fo the source as indicated on the power
meter is subtracted from the variations on the CRT trace, giving a resultant variation due
only to the receiver and display section, |
The receiver frequency response in ratio measurement mode may be red directly from the
CRT display since all common mode variations due to the source are cancelied. Also,
А2-28
Model 8505A
A256, MAGNITUDE, PHASE, AND GROUP DELAY FREQUENCY RESPONSE (Cont'd)
frequency response in group delay mode is read directly from the CRT trace by noting the
deviation from the center graticule reference.
B505A NETWORK ANALYZER
OUTPUT EN OU
POWER
SENSOR
POWER SPLITTER
т 500 TERMINATION
Figure A2-18. Absolute Magnitude Frequency Response Test Setup
EQUIPMENT:
Power Meter . aa eoaoono noe. HP 435A
Power Sensor... 1200111041 LA LA RL a Le RL a Le HP 8482A
Three-Way Power Splitter... ................... HP 11850A
50-Ohm Termination. .. .......... 22... HP 909A Option 012
PROCEDURE:
ABSOLUTE MAGNITUDE FREQUENCY RESPONSE
a. On 8505A, set the controls as follows:
On Al Source/Converter:
OUTPUT LEVEL dBm........ ea —10
OUTPUT LEVEL VERNIER ....................... —10
INPUT LEVELABm MAX ..... к вк. —10
On A2 Frequency Control:
RANGEMHz ......... aa aa 00 0.5 — 1300
MODE. ...120000 04000 LL La LA La A4 a aa ae LIN FULL
WIDTH... aereo. START/STOP 1
SCANTIMESEC ..... 4 A LL a LL a aa ane | -.1
SCANTIMEVERNIER ....................... Midrange
NOTE
it may be necessary to make slight adjustment at 0.50 MHz of
Frequency Calibrate pot behind FREQUENCY CONTROL front
panel. (See paragraph A2-51, steps d through i.)
MARKERS aaa adonde A a ee I
Marker I... RR e Midrange
Installation
A2-29
installation
Model 8505A
A2-56. MAGNITUDE, PHASE, AND GROUP DELAY FREQUENCY RESPONSE
{Cont'd}
А2-30
Оп АЗ Signal Processor:
Channel 1
INPUT. oe ees R
MODE ee ee MAG
SCALE DIV ..... era rea 0.5 dB/DIV
Channel 2
MODE area aaadernerenoonredoonerococonaao. OFF
CRT Display
REF LINE POSN 1... ....,.......... Center Graticule Lme
BW ee 10 kHz On (in)
VIDEO FILTER .... uan. Off (out)
Connect equipment as shown in Figure A2-18 with "R" INPUT cable connected di-
rectly to RF OUTPUT connector.
Press DISPLAY CLR, MKR, then ZRO pushbuttons. Observe the highest and lowest
point on the CRT trace between 0.5 and 1300 MHz. They should not be greater than
3 dB difference. If the CRT trace is within tolerance, go to step h and check "A"
input port. If "A" port has been checked, go to step i and check 'B' input port.
If the CRT trace is out of tolerance, go to step d and cancel the affect of the KE
source variations to see if the receiver section is actually within tolerance.
Connect equipment as shown in Figure A2-18 with RF OUTPUT to center of Power
Splitter and one leg of power splitter to port R ' and the other leg to Power Sensor
and Power Meter.
Set Marker 1 to the point on CRT trace that is maximum. Note Marker reading and
Power Meter reading.
Set Marker | to the point on CRT trace that is minimum. Adjust OUTPUT LEVEL
VERNIER and step attenuator to set Power Meter to the same indication noted in
step e.
The difference between the Marker indication noted in step e and the displayed marker
reading in step f should be <3 dB.
Disconnect RE Cable from "R'' INPUT and connect to A’ INPUT. Set Signal Proces-
sor Channel 1 INPUT switch to A. Repeat preceding step c and observe the power level
variations for "A" INPUT.
Disconnect RF Cable from "A" INPUT and connect to 'B' INPUT. Set Signal Proces-
sor Channel 1 INPUT switch to B. Repeat preceding step c and observe the power level
variations for "B' INPUT.
Model 8505A Installation
A256. MAGNITUDE, PHASE, AND GROUP DELAY FREQUENCY RESPONSE
{Cont'd)
$505A NETWORK ANALYZER
OUTPUT | OC : en 2 a
a |
MATCHED
COAXIAL Æ
CABLES
`. ! a POWER
INPUT SPLITTER
Figure A2-19. Ratio Frequency Response Test Setup
EQUIPMENT:
Three-way POWER SPLITTER . o.oo... 0.0... HP 11850A
Mafched Cable Kit. 200000000000 000 i HP 1185JA
RATIO MEASUREMENT MAGNITUDE FREQUENCY RESPONSE
j. Connect equipment as shown in Figure A2-19 with the power splitter connected to
"R", "A" and "B' inputs and Power Meter disconnected from setup.
k. On A2 Frequency Control, set RANGE MHz switch to 0.5 — 1300 MHz position, set
MODE to LIN FULL, WIDTH to START/STOP 1, SCAN TIME SEC to | — .1, and
TRIGGER to AUTO. Set MARKERS switch to I position and Marker 1 control to
approximately 640 MHz.
1. On A3 Signal Processor, set CHANNEL | INPUT switch to A/R, set MODE to MAG,
set SCALE/DIV switch to 0.1 dB position and set VIDEO FILTER off (out). Press
DISPLAY MKR, then ZRO pushbutton.
m. On A2 Frequency Control, adjust MARKER 1 frequency control between 0.5 MHz
(left end of CRT trace) and 1300 MHz (right end of CRT trace). Note the highest and
lowest reading on the Signal Processor Channel 1 readout. The difference between the
highest and lowest reading (peak-to-peak variation due to frequency response) should
be <0.6 dB.
п. Set Signal Processor Channel I INPUT switch to B/R. Press DISPLAY MKR, then ZRO
pushbuttons. Repeat preceding step m.
A2-31
Installation
А2-32
A2-56. MAGNITUDE, PHASE, AND GROUP DELAY FREQUENCY RESPONSE (Cont'd)
Model 8505A
PHASE MEASUREMENT FREQUENCY RESPONSE
O.
Set MODE to LIN EXPAND, WIDTH to START/STOP 1, MARKERS switch to |
position, and Marker 1 control to mid-position. Set START to 0000. MHz, STOP to
0750 MHz. Set Channel 1 INPUT to B/R, MODE to PHASE, and SCALE/DIV to
2 degrees. |
Set WIDTH to START/STOP 2. Set START to 0750 MHz and STOP to 1300 MHz.
Return WIDTH to START/STOP 1.
Set ELECTRICAL LENGTH INPUT to B and MODE to LENGTH XI. Press LENGTH
pushbuttons to make the overall CRT trace as horizontal as possible. (It may be neces-
sary to press Channel 1 DISPLAY MKR, then ZRO to bring trace on CRT)
Press Channel ! DISPLAY MKR, then ZRO pushbutton to position the trace near the
center graticule line. The maximum trace deviation from the highest point to the
lowest point should be <6 degrees (3 divisions). If the reading is out of tolerance, the
power splitter tracking may be at fault. Check the power splitter tracking as follows.
Reverse the connections to the power splitter legs, then make the phase measurements
again and subtract the two readings. The difference in readings is the power splitter
tracking error. Correct the original phase measurements by subtracting one-half the
power splitter tracking error.
Set WIDTH to START/STOP 2 for the 750 to 1300 MHz range. The trace deviation
should be < 10 degrees (5 divisions).
Repeat steps o through s for A/R measurement. Set all switches the same, except set
Channel I INPUT switch to A/R in step o and set ELECTRICAL LENGTH INPUT
switch to À in step aq.
GROUP DELAY FREQUENCY RESPONSE
Ч.
On A3 Signal Processor, set Channel 1 INPUT switch to A/R, MODE switch to DLY
and set SCALE/DIV switch to 1 ns, Set Frequency Control MODE switch to LIN
FULL.
Press Electrical Length DISPLAY CLR pushbutton. Press Channel 1 DISPLAY MKR
then ZRO pushbuttons to center CRT trace about center graticule line and zero
digital readout,
On AZ Frequency Control, adjust MARKER |! frequency control between 0.5 and
1300 MHz and note the highest and lowest reading on the Signal Processor Channel I
readout. The difference between the highest and the lowest reading (peak-to-peak
variation due to frequency response) should be <2 ns.
Repeat steps t through v for B/R measurement. Set all switches the same except set
Channel | INPUT switch to B/R in step и.
A2-57, PHASE ACCURACY AND ELECTRICAL LENGTH TEST
SPECIFICATION:
Phase Accuracy:
+0.01 degrees/degree for £170 degrees
+0.01 degrees/degree £0.5 degrees for +180 degrees.
Model 8505A Installation
A2-57. PHASE ACCURACY AND ELECTRICAL LENGTH TEST (Contd)
Polar Accuracy:
Actual value is within less than a 3 mm circle of displayed value.
Electrical Length Accuracy: £3% of reading + 1% of length range.
DESCRIPTION
The hysteresis loop is observed to see that the 180 degree transition occurs at precisely +180
degrees and —180 degrees. The electrical length offset is checked by inserting two phase cyles
and reading the resultant Electrical Length digital readout of 720 degrees.
8505A NETWORK ANALYZER
RF
GUTPUT
f
Rial
MATCHED Г ADAP
TENE ) = TER
CABLES | ED
Lo QS POWER SPLITTER
hist
TERMINATION
Figure A 2-20. Phase Accuracy Test Setup
EQUIPMENT:
3-Way Power Splitter. ....... 2... 61e 2 00 HP 11850A
REF Cable Kit. ........ ee, HP 11851A
Type N Female to Type N Female Adapter. ....... HP 1250-0777
50-chm Termination... ................ HP 909A Option 012
PROCEDURE:
PHASE ACCURACY TEST
a. On the 8505A, set the controls as follows:
On Al Source/ Converter
OUTPUT LEVEL dBm ..... i —10
OUTPUT LEVEL VERNIER . reee. e О
INPUT LEVEL dBm MAX . eee —10
On A2 Frequency Control
RANGE MHz 20 4 a 4 a 1 ee 440 0.5 — 130
MODE вок увенее о LIN EXPAND
WIDTH © ea 0 CW AF
CW FREQUENCY ...... 022,000... ae 60 MHz
+AF FREQUENCY . oo. ii 1 0 0 0 6.0 MHz
SCAN TIME SEC... aaa 0.1 —0!
А2-33
Installation Model 8505A
A2-57. PHASE ACCURACY AND ELECTRICAL LENGTH TEST (Cont'd)
A2 Frequency Control (Cont'd)
TRIGGER 11100104 LV 4 LA 444 AA A A A La LL LL AUTO
MARKERS © AA ALL LL LL LL 110 1
Marker bo. 4 A Le LL AL LL AA a a a a LL LL 60 MHz
On A3 Signal Processor
Channei 1
INPUT RL A/R
MODE 1111110 2444 A4 LL LVL LL LA a AV PHASE
SCALF/DIV 2..2... LL LL LL LL LL LL LL 90 °/DIV
Channel 2
MODE RR OFF
CRT Display
BW (Bandwidth) .... aa neniededoe, 10 kHz
Video bilter... 1110101111 LL La LA Aa A LA a Aa A Off (out)
b. Connect equipment as shown in Figure A2-20 with two 24-inch matched cables con-
nected in series between Port "A" and the 3-way power splitter.
c. Offset the phase trace with the Channel 1 REF OFFSET pushbuttons to place a phase
transition to the right of midscreen as shown in Figure A2-21.
fe = = A
i
1
„”
Figure A2-21, CRT Trace of Phase Transition Figure A2-22. Hysteresis Loop of Phase Trace
d. Set SCAN TIME SEC to MANUAL. Sweep through the transition in both forward and
reverse direction using the Manual sweep control. Note the hysteresis loop as shown in
Figure A 2-22.
E. Adjust both CW FREQUENCY and +AF FREQUENCY to make the hysteresis loop six
divisions wide and centered on the vertical center line of CRT. (See Figure A2-22))
NOTE
If either step f or g is out of tolerance, refer to Section V for adjust-
ment of ASA 12 Phase Detector,
A2-34
Model 8505A
A2-57. PHASE ACCURACY AND ELECTRICAL LENGTH TEST (Cont'd)
Е.
Press Channel 1 DISPLAY MKR. Center trace dot on the vertical center line at point
"A" on Figure A2-22 trace. The marker readout should be +180 degrees 3.3 degrees.
Center trace dot on the vertical center line at point 'B' on Figure A2-22 trace. The
Channel 1 marker readout should be — 180 degrees +3.3 degrees.
ELECTRICAL LENGTH LINE STRETCHER TEST
h.
Remove extra 24-inch cable and adapter and reconnect Port "A" to the three-way
power splitter through one of the matched cables.
On Frequency Control, set:
RANGE MHZ... LL LL LL LL LL LL 0.5 — 1300 MHz
010) ееенее LIN EXPAND
WIDTH... aa aaeonrendoana ar CW +AF
tAF FREQUENCY 1111144 LL LL Le LL LL 40 0 MHz
CW FREQUENCY
(read on FREQ COUNTER MHz panel) .......... 1000 MHz
On Signal Processor, set:
Channel 1:
INPUT. oo aa ALL LL A/R
1101) LL ALL La LL POLAR MAG
SCALE/DIV 11110110 a ALL LL POLAR FULL 1
CRT Display:
BW (Bandwidth)... .......... ... ........ 10 kHz On (in)
VIDEO FILTER... 110 LL LL 0 Off (out)
At ELECTRICAL LENGTH panel, set:
INPUT. LL 11101 LL LL A LL A LR LL LL À
MODE LENGTH... LL LL LL LL LL LL X10
VERNIER A... ...... 0 (fully counterclockwise)
DISPLAY CLR. ........ i, . Press and release
On Channel 1, press DISPLAY MKR, then ZRO pushbuttons. Set Channel 1 MODE
Switch to POLAR PHASE, then press DISPLAY ZRO. This should place the trace dot
within 3 mm of the outside cirele and zero degrees.
Press ELECTRICAL LENGTH pushbuttons to add +30 cm length. The trace dot
should move around the outside circle back to O degrees +10 degrees,
Set ELECTRICAL LENGTH MODE switch to LENGTH X1 position. Press ELECTRI-
CAL LENGTH pushbuttons to read +15 cm. The trace dot should be at 180 degrees
+5 degrees. The same indication appearing on the CRT should appear on the Chan-
nel 1 digital readout.
LINEAR PHASE RANGE
I.
Set Channel 1 MODE to PHASE and SCALE/DIV to 90 degrees. On A2 Frequency
Control, set SCAN TIME SEC switch to 0.1 — .01. Set ELECTRICAL LENGTH
MODE switch to PHASE X10 degrees/SCAN. Press Channel 1 DISPLAY REF, then
CLR and press ELECTRICAL LENGTH DISPLAY CLR.
Installation
A2-35
Installation Model 8505A
A2-57. PHASE ACCURACY AND ELECTRICAL LENGTH TEST (Cont'd)
o. With ELECTRICAL LENGTH offset pushbuttons, put in +1800 degrees of electrical
length. (The electrical length readout displays +180.) Verify that five transistions are
displayed and that the linear phase display limits over approximately the last 5%
of the trace. (See Figure A2-23, Photo A.)
+1800° A B —1800°
LIMITING LIMITING
< 5% {< 90°} < 5% (<80°)
Figure A2-23. Phase Trace with Maximum Electrical Length Added
p. Reduce electrical length with LENGTH pushbuttons until the limiting section just goes
off-screen. The digital readout at ELECTRICAL LENGTH panel should be >+175
(>= 1730 degrees).
q. With ELECTRICAL LENGTH offset pushbuttons, put in —1800 degrees of electrical
length. (The electrical length readout displays ~180.) Verify that five transitions are
displayed and that the linear phase display limits over approximately the last 5% of the
trace. (See Figure A2-23, photo B.) |
r. Reduce electrical lensth with LENGTH pushbuttons until the limiting section just goes
off-screen. The digital readout at ELECTRICAL LENGTH panel should be equal to
or more negative than —173 (equal to or more negative than —1730 degrees).
LINEAR PHASE ACCURACY
s. On ELECTRICAL LENGTH panel, set MODE switch to PHASE X 10 degrees/SCAN,
set VERNIER A to zero, then press DISPLAY CLR pushbutton.
t. On Channel I, set MODE switch to PHASE. Press DISPLAY REF, then CLR push-
buttons. Press MKR, then ZRO pushbuttons. Press DISPLAY REF, then REF OFF-
а
u On ELECTRICAL LENGTH panel, press LENGTH pushbutton to obtain two com-
plete phase cycles on the CRT screen. The ELECTRICAL LENGTH digital readout
should be +72 +2, corresponding to £720 degrees +20 degrees of electrical length.
A2-36
Model 8505A Installation
A2-b8. GROUP DELAY ACCURACY TEST
SPECIFICATIONS:
Group Delay Accuracy: <+3% of reading +1 ns for 0.5 to 1300 MHz range, or +10 ns for
0.5 to 130 MHz range, or + 100 ns for 0.5 to 13 MHz range.
DESCRIPTION:
A 50-foot coaxial cable is measured for group delay using the phase function of the 8505A.
The group delay mode is then used to measure the 50-foot cable to obtain a direct group
delay reading.
8505A NETWORK ANALYZER
QUTPUT | +
> MATCHED COAXIAL
CABLES
TEST CABLE
=H] FT. COAXIAL
CABLE
POWER SPLITTER a
Figure A2-24. Test Setup to Measure Group Delay of Test Cable
EQUIPMENT:
3-Way Power Splitter. ..... .... .... ..... HP 11850A
Matched Type-N Coaxial Cables ............... .. HP 11851A
Test Cable... a >50 foot of coaxial cable
| {RG-223/u or similar)
BNC to Type-N Adapters .................... HP 1250-0780
PROCEDURE:
a. A coaxial cable greater than 50 feet in length is used as a standard in the group delay
test. Group delay of the test cable is measured with the 8505A in phase mode as
follows:
(1) Connect the "Test Cable" in A channel between the matched cable and the
power splitter as shown in Figure A2-24.
(2) Set 8505A controls as follows:
On Al Source/Converter:
OUTPUT LEVEL dBm ....... aaa —10
OUTPUT LEVEL VERNIER ............ i... 0
INPUT LEVEL dBm MAX ....... a —10
А2-37
instaliation
A2-58. GROUP DELAY ACCURACY TEST (Cont'd)
On A2 Frequency Control:
RANGE MHz . 12201 1011 LL 4 a a 4 4 4 a ea a a coa. 0.5 — 1300
MODE. 11111011 LL LL 4 a a ea 4 a 4 о LIN EXPAND
WIDTH © ee aaa CW
SCAN TIME SEC eee 0.1 — .01
TRIGGER. eee AUTO
MARKERS ee 1
SCAN TIME SEC Vernier .. 111111111014 4 4 1 eve» Midrange
On A3 Signal Processor:
Channel |
INPUT. ea aa aaeneerire e A/R
MODE ee PHASE
SCALE DIV eee 45 DEG
Channel 2
MODE NK OFF
Electrical Length
INPUT. arar aero eerrere.. A
MODE. 1.111120 414 1 naaa rerecorenoreocrorerene OFF
(3)
(4)
(5)
A2-38
Change in Phase
Change in Frequency = 713 MHz —700 MHz
Model 8505A
Press Electrical Length DISPLAY CLR pushbutton. Set A2 Frequency Control
CW FREQUENCY and VERNIER for 700.00 MHz. Press Channel 1 DISPLAY
MKR pushbutton, then ZRO pushbutton to zero the digital readout.
On A2 Frequency Control, adjust CW FREQUENCY up in frequency until the
marker digital readout again indicates O degrees. Record frequency for use in
later calculation. NOTE: The phase change between the two zero points is 360
degrees.)
Frequency =
MHz
Calculate the group delay of the "Test Cable".
= (Phase change in degrees)
360 X {Change in Frequency in Hz)
tp
EXAMPLE
360 degrees
Н
i
= 13 MHz
ty 360 degrees _ |
360 (13 X 10° Hz) 13 X 10° Hz
= 77 ns
Model 8505A
A2-58. GROUP DELAY ACCURACY TEST (Cont'd)
Installation
b. Connect equipment as shown in Figure AZ-24 with both matched cables and adapters
connected to power splitter and ' test cable" not connected in circuit.
с. On 8505A, set controls as follows:
On A1 Source/Converter:
OUTPUT LEVEL dBm ..... LL Le LL ALL LL —10
OUTPUT LEVEL VERNIER ©... a a LV VA 0
INPUT LEVEL dBm MAX ©... aerea. — 10
On A2 Frequency Control:
RANGEMHz ...... LL LL LV A CL Aa A LL 0 0.5 — 1300
MODE. н ники ккв A 4 A A A a aa aa ae LIN FULL
WIDTH a aaa aae oa START/STOP 1
SCAN TIME SEC ea aaa | — 1
SCAN TIME VERNIER ........ ............ Fully clockwise
MARKERS 111114112414 A 4 4 4 4 A Ad A a A CL ALL La |
Marker 1121140111 LL Lea aa ee... Midrange
TRIGGER 1114111141 LA 4 4 4 a a 4 A LA Le AA RL LL LL AUTO
On A3 Signal Processor:
Channel |
INPUT. LL. LL LL LL LL LL AL La A A A RL VAL RL LL LL LL A/R
MODE. A A 4 AA A a a at DLY
SCALE DEV LL a LL. DELAY 100 ns
Channel 2
MODE... 101014 10 LL A4 LA ALL LA A A Ra A a OFF
Electrical Length
INPUT. LL LL LL LL LL LA LL A LR A A ALAN LL LL La a LL A
MODE. Na NA 4 a ne OFF
d. Press Electrical Length DISPLAY CLR pushbutton.
e. Press Channel | DISPLAY REF pushbutton, then CLR pushbutton until REL light
goes out (if it was lit). Then press MKR pushbutton.
f. Connect Test Cable" between adapters in the A channel. The Channel 1 digital read-
out should indicate the group delay calculated for the "Test Cable" in step a (5)
above + (1 ns +3% of reading).
A2-39/A2-40
Model 8505A
Operating and Programming Instructions
SECTION III
OPERATING AND PROGRAMMING INSTRUCTIONS
A3-1. INTRODUCTION
A3-2. This section of the manual contains instruc-
tions showing how to make transmission and re-
flection measurements in both manual and auto-
matic modes.
A3-3. Included are step-by-step instructions on
manual operation supplied in Application Note 219,
as well as detailed instructions for programming
the 8505A in automatic mode from an external
controller through the Hewlett-Packard Interface
Bus (HP-1B).
A3-4, Manual Operation
A3-5. Application Note 219 is included in this
section to introduce you to the various manual op-
erating modes, and to give you a step-by-step
sequence of operations to make specific measure-
ments on a device.
A3-6. If you are interested in the operation of
specific controls on the 8505A, go to Figures A3-1
through A3-4. In these figures, the function of
each control 1s described in detail.
A3-7. Remote Operation and Programming
A3-8. The HP 8505A has a remote programming
interface using the Hewlett-Packard Interface Bus
(HP-IB). All measurements that can be taken by
the standard 8505A Network Analyzer can be
automatically programmed and controlled re-
motely via the HP-IB. This provides a remote op-
erator with the same control of the instrument as
does a manual (local) operator. Remote control
is maintained by a system controller (desk-top
computer, etc.) that sends commands or instruc-
tions to and receives data from the 85054 using
the HP-IB. The HP-IB is Hewlett-Packard's imple-
mentation of the IEEE Standard 488-1975. A
complete general description of the HP-IB is pro-
vided in the manual entitled ' Condensed Descrip-
tion of the Hewlett-Packard Interface Bus, HP
Part Number 59401-90030.
A3-9. Programming information for the 8505A 18
given in Paragraph A3-14 and on. Specific exam-
ples are given for HPL and BASIC languages: the
HP 9825A Desk-top Computer in HPL and the HP
9830A/B in BASIC. A table of HP-IB commands
together with sample command statements are
given in Table A3-1. A glossary of HP-IB terms is
given in Table A3-7. A summary of codes to com-
mand the 8505A is given in Tables A3-2 and A3-3,
Figure A3-5 gives the 8505A programming codes
in pictorial form. Some programming functions
require programmed time delays to allow comple-
tion of an operation. These are listed in Table A3-4.
A3-1/A3-2
8505A/0000-99
October 1979
Supersedes: none
INTRODUCTION
This programming note contains a summary of the
HP-IB codes used in the 8505A and their functions. it
is intended for use by those familiar with both the
8505A and НРАВ programming. Refer to the 8505A
Operating and Service manual for a complete
explanation of the codes and functions.
ADDRESS TABLE
Instrument Talk Listen Decimal
8505A Processor P 0 16
8505A Source S 3 19
The addresses may be changed by removing instru-
ment covers and setting appropriate slide switches
on the HP-IB circuit boards. For detailed instructions
see Chapter A, Section Il of the 3505A Operating and
Service Manual, HP part No. 08505-80072.
DATA
The 8505A consists of two separately programmed in-
struments, Processor and Source.
8505A Instrument Conventions
1. Program letter codes must be uppercase, leading
zeros and spaces are ignored.
2. Any controls not programmed will assume their
front panel state as positioned before remote.
3. The switches are programmed using two
character format.
a. The first character is a letter corresponding
to switch name (example “R' for range).
b. The second character is a number
corresponding to the position of the switch
beginning with 1 at the left or CCW position.
c. Other controls have the same alpha-numeric
sequence but may use a two letter code, a
plus or minus sign, and up to a 5 digit
number code.
Processor Programming Conventions
1. The Processor codes may be sent in any order
except:
a. The duplicate controls for each display
channel require that the following prefix
codes be used,
“C1” for all CHANNEL 1 codes
“C2” for all CHANNEL 2 codes
“C37 FOR ALL ELECTRICAL LENGTH codes
“CO” for the BandWidth code
6. Use the letter “E” to separate all “BR”, “07,
and “D” program statements and to end the
programming string.
2. The last digit programmed in REFerance
OFFSET may not be displayed on the front panel
LEDS.
Source Program Convention
1. The Source codes may be sent in any order
except:
a. Range “FR”, Mode “M”, and Width “NW codes
shouid precede “FA” and “FB” codes,
b. The ‘etter “E” is used to end the
programming string.
2. FA and FB units are reduced by a factor of 10
when in W4 with phase lock option.
Reading the 8505A
The Processor MARKER values may both be read by
reading them into two variables, The units are the
same as displayed on the front panel LEDs.
The Counter marker value is obtained by reading the
source into a variable. The units are in HZ.
The current state of many of the 8505A controls may
be output using the Learn Mode (program “L’") then
read on a properly dimensioned string,
Processor Learn String: 85 Characters
“Сова, сна Md Sa R + ddddd (Gala Md Sd
4 9 1 13 15 25 27 29
R + ddddd, CS Md Sa A = 096, E
3 41 43 45 47
C10 +ddddd, C20 + ddddd, C30 = ddd, E”
|
57 67 77 85
Source Learn String: 30 characters
“0d 11d Re Rd Md wd Sd Td, FAdddd, FBdddd, Е
2 4 5 3 10 12 14 18 25 30
HEWLETT-PACKARD CO. 1979
HEWLETT La PACKARD
FOCUS INTENSET
re BW ss VIDEO
10 kéz : LTER
STE
A a GREEN н
race x POSE a GRAF ES E REF OFFSET + po DISPLAY === per LENGTH ~~ DISPLAY
Lop pr
e © © pou EE Eee | E Eels
; LEA
A dba ею dba ARE SEL, a
NPP 39 odie CE) Sek
ia a E Ta CREA
Les © > LH? Ta LA a WLW REE
INPLIT [MPEFF
` т
O) | | KA 8 AA BA
. ar = и pad " PERE
mp 3 io à
bmp essa a —
REF LINE POSN : MODE — POLAR ——
i QFF MAG PHASE DLY MAG PHASE
- HEAL CENTER SCALE/ THY
= dr MAG 20 1605 ? t 5 5 dB
POL > POL :
PHASE 360 90 ab 76 10 5
О . NOT ¡POLAR FUEL + 6 2 10 66 a2
_— soo PROGRAMMABLE |
А 3
MODE
PLENGTHA PHASE
OFF OX CATUSCAN -
> VERNIE BR
A
2 8
Е 2 1 DE и -
. ин re a 7 \ 7
© E A dd A Ad $e fiso mt © ©
`` DELAY 200 100 BO 26 19 5 2 MÍ 1 a a
. a
PROCESSOR PROGRAMMING co DES
HP-IB HP-IB
FUNCTION AND COMMENT CODE … FUNCTION AND COMMENT CODE
IF and VIDEO filter selection | сова ELECTRICAL LENGTH code must 3
| “precede the other codes in C3.
| INPUT" de
CHANNEL code must precede the с2 MODE” via
other codes used in the channel. C1 | N
codes are the same as C2 codes. ELECTRICAL LENGTH Ax ddd
INPUT" id Stored Electrical Length {x ddd
MODE* Md The range of numbers for “R” and
SCALE/DIV” - <q “O” is £199. The plus sign is implied
REFerence OFFSET 2 + ddddd and leading zeros ignored. Decimal
STORED CALIBRATION ¢ + ddddd ‘position is not programmed. It is _
The range of numbers for “R” and | shown below to give implied position.
“0” is + 19999, The plus sign is im- ‘
plied and leading zeros ignored. ddd Source C3 Metric
Decimal position is not programmed. - Range Mode Scale
It is shown below to give implied vu) 3 m
position, 3 3 cm
1 2 m
dddd 2 3 m
E Phase (degrees) 3 2 em
_— Delay 1300 MHz (ns) 2 2 m
-—— Magnitude (dB) | |
¡ ——— Delay 13 MHZ (us) | DISPLAY" D2 when programmed _
—— Delay 130 MHz (us) does not clear stored Length to clear | 76
this enter OO,
DISPLAY" D3 when programmed ра Non-Learned programming code.
clears only “R”, to clear “O” enter | ‘
Q0. Non-learned programming code. | Mode of unselected input oniy on
Learn string (characters 44 and 45).
Non-Programmable. Sa
*The range for values of “d” are shown on Terminator used to end and separate
corresponding control in illustration above. ali (*R”', O”, and “D”) program
| statements Е
3
COUTRUT INDEFE ————""
LEVEL dBm ERNIER
3 5 So es INPUT LEVEL
0.7 Poy - 89 SUE
от (С) --2 N
= 80 - O - + A OF RO PROSE
il - 93 ое; la ©
Г РА | FB FC
| FREQUENCY ona | | FREQUENCY ner , MARKERS
7 FR) | 7 3 > x : ! с NO #5) 4
| == ; NE = а NTT Na =
> `. / =, e =
RANGE Mhz MODE _ WIDTH - O © `
VERNIER SCAN TIME SEC THIGGER LINE
„ >, MANUAL — 100 = 10 — 1 = 1 — Dt AUTO LINE EXT SINGLE
É Ne fi | = TA OFF ON
©) E
— COUNTER AESCHLUYTHON [Loca]
/
SOURCE PROGRAMMING CODES
HP-iB HP-I8
FUNCTION AND COMMENT CODE FUNCTION AND COMMENT CODE
| START FREQUENCY and CW = addad
QUTPUT LEVEL dBm 10 dB steps” Ca STOP FREQUENCY and AF radddd
VERNIER Locai Lockout required to Leading zeros are ignored. Decimal
program. Setting not on Learn String. position is not programmed. It is
dd = 99 ((V + 12)/12) V = Vernier in dB | vdd shown below to give implied position,
INPUT LEVEL dBm MAX* id The range of frequencies for Range
and Mode settings are shown below.
dd dd |
RANGE MHZ" =d | Range Model Mode 2 & 3
MODE (sweep)* M4 = PHASE LOCK rid | La 11000 MHz 1 1300 MHz
mode | 2 $ 100.0 MHz .5 — 130.0 MHz
WIDTH" | Ma 1 1-10.00 MHz .5- 13.00 MHz
SCAN TIME SEC* Vernier 3 |
defaults to min Scan Time when Vernier controls default to min (CCW)
Local Lockout is set when Local Lockout is set. When in
TRIGGER" da Mode “M4” the units for FB change
- to kHz.
о FREQUENCY COUNTER Only one
*The range of values for “d” are shown on cor- marker available in remote. Set
responding control in illustration above. marker (dd) to percentage of sweep
width between 00% and 99%. dd
Las
C3 ELECTRICAL LENGTH
switching).
ZRO, CLR, INPUT, AND MODE
(resolution changes):
Resolution constant
Autoranging
TIME SEC, TRIGGER
STARTISTOP, +4F
CW ito 0.01%)
OPERATION - DELAY REQUIRED
PROCESSOR settling times
COB BandWidth
10 kHz 10 ms
1 kHz 25 ms
video Filter 300 ms
C1-C2 CHANNELS à & 2
Any change affecting Reference Level {includes REF OFFSET,
CLA, INPUT, MODE, and 8503A/B Test Set switching
To 1% final value 1000 ms
To 01% final value
ZRO (MKR & REF mode), CLA, INPUT, MODE, and SCALE/DIV
Any change affecting LENGTH (inciudes LENGTH, CLR,
Channel 1 and 2 MODE, INPUT, and 8503A/B Test Set
Read marker value and determine if auto-ranging occurs
SOURCE settling times OUTPUT, INPUT LEVEL dBm, MAX SCAN-
3000 ms
At least 3 sweep times per channel +
3000 ms
3000 ms
20 ms
1 sweep/Channei + 25 ms
2 sweeps/Channel + 100 ms
20 ms
120 ms
1000 ms (first freq.)
360 ms (next freq.)
OTHER HP-iB COMMANDS
. Trigger: The 8505А does not respond to a device
Trigger,
Clear: The 8505A does not respond to a device Clear.
Remote: The Remote message will disable the 8505A
front panel programmable controis. it will retain the
pre-remote front panel settings until cnanged by
program.
Local: The Local message or switching the 8505A off
and on will return the 8505A to manual front panel
control.
Local Lockout: Disables local switch on 8505A front
panel and “presets” vernier controls.
VERNIER CONTROL “PRESET” POSITION
Output Levei - 10 dBm
Scantime Vernier Scan time min
Frequency (2) 0 Position MAX CCW
Electrical Length 0 Position MAX CCW
Serial Poll Enable: HP-iB, Octal 030.
Serial Poll Disable: HP-1B, Octal 031
Service Request: If the Serial Poll is enabled the
Source will Service Request if loss of phase lock or
RF input overload occurs. Bit 8 of the Status Byte will
also refresh this. An initial Serial Poll after power on
will enable the Service Request.
Pass Control: The 8505A does not have the ability to
Pass Control or take Control.
Abort: The 8505A does not respond to the Abort
. message.
For more information, call vour local HP Sales Office or nearest Regional Office! Eastern (301) 258-2000; Midwestern {312} 255-9800; Southern (404) 955-1500; Western (213) 877-1282:
Canadian (416) 678-9430. Ask the operator for instrument sales, Or write Hewlett-Packard, 1501 Page Mill Road, Palo Alto, CA $4304. In Europe: Hewlett-Packard S.À., 7, rue du Sois-du-ian,
P.O, Box, CH 1217 Meyrin 2, Geneva, Switzerland. In Japan: Yokogawa-Hewtett-Packard Lid., 29-21, Takaido-Higashi 3-chome, Suginami-eu, Tokyo 168,
2952-9293
PRINTED IN USA
NOVEMBER 1978
PACKARD
E
fe
La
nd
=
a
I
INTRODUCTION 000000000 000000 Keen ae 3
Overview 8505A, test sets, and control! functions.
TRANSMISSION MEASUREMENTS ............. 15
Setup, calibration, and measurement sequences for:
Insertion Loss and Gain
Insertion Phase
Electrical Length
Deviation from Linear Phase
Group Delay
REFLECTION MEASUREMENTS oo... vive. 22
Setup, calibration, and measurement sequences for:
Return Loss, SWR
Reflection Coefficient
POWER LEVEL MEASUREMENTS 4 8 9 5 0 # # 6 6 # à 6 её 25
Measure the absolute power at the R, A, and B inputs.
SPARAMETER MEASUREMENTS 0000000000000 26
Setup, calibrate, and measure Sy, Sor, Sız, and S,, using the 8503A
S-Parameter Test Set.
THE 8501A STORAGE-NORMAILIZER ............ 30
Use the Digital Storage, Labels, Averaging, Magnification, and
Normalization features of the 8501 A to enhance 8505A measurement
capabilities.
CONTROLS AND DISPLAYS SUMMARY ......... 33
A summary of the functions of the 8505A controls and displays.
This application note will help you make transmission and reflection measurements with the
Hewlett-Packard Model 8505A RF Network Analyzer and its associated test sets. Previous ex-
perience in network analysis techniques is assumed, so the note concentrates on generalized
setup, calibration, and measurement sequences rather than basic measurement theory. As you
become familiar with operation of the instrument you can modify and extend these sequences
to more specialized applications.
The first part of this note introduces the 8505A and the standard test sets, then describes the
main operations to make measurements. The Transmission Measurements, Reflection
Measurements, Power Level Measurements, and S-Parameter Measurements sections contain
specific step-by-step sequences used to make particular measurements on a device. If you have
a device to measure, go directly to one of these sequences and try it. Use the Introduction as a
reference for operations that require more explanation. A section for the 8501A Storage- Nor-
malizer provides a brief description of how to use this important accessory. A foldout at the rear
of this note presents a photo of the 8505A front panel and a summary of the functions of the
controls, indicators, and displays.
Learn by doing. Use the 8505A to measure a device with known characteristics. You will bet-
ter appreciate the ease with which measurements are made if vou have access to an 8505A with
test set from the very beginning. But, during the interval prior to arrival of your 8505A, you can
develop valuable background knowledge of instrument operation from this note. Although the
8505A is fully programmable via the HP-IB, this note does not describe programming opera-
tions. It is recommended that you gain a good understanding of the 8505A in manual operation
before writing programs to control it,
TRANSMISSION
Test
СОАО с
nla ed Network
Transmittes 11
Group Delay
(nsec, usec)
Gain (dB) Fe
Insertion Loss {dB} #4
Deviation From
Linear Phase
{Degrees}
Insertion Phase
(Degrees)
$19, So, Electrical Length
Transmission Coefficient {em m}
(т/ф)
Test
Network
SWR
{Calculated}
Return Loss
(dB)
$11. 322 Impedance
Reflection Coefficient (R+IX]
(PLB) {Smith Overiay}
Basic 8505A Transmission and Reflection Measurements
Reference |
Frequency
Counter
Stretcher
Magnitude +
Detector
Test
Magnitude §
Detector
Polar
Cetector
Display
Multiplexer
Electronic
Line
Phase
Detector
Group
Delay
Detector
8505A Simplified Block Diagram
The 8505A is a high performance RF network analyzer that includes a leveled source, frequency counter, two
measurement channels, dual-trace CRT with both cartesian and polar displays, digital readout of the measured
value, and an electronic line stretcher. Together with appropriate signal routing accessories, the 8505A is a fully
integrated stimulus/response test system that measures magnitude. phase, and delay characteristics of linear
networks by comparing the incident signal with the signal transmitted through the device or reflected from its
input.
The basic transmission measurements described in this note are: insertion loss and gain, insertion phase, elec-
trical length, deviation from linear phase, group delay, and transmission coefficient (5,7 Or 521 ). Basic reflection
measurements are: return loss, from which SWR can be calculated, and reflection coefficient (S;; or S;,}, from
which impedance can be calculated or read from a Smith Chart overlay.
To begin familiarizing yourself with the 8505A, recognize that it is packaged in two cases. The lower case
contains the sweeper controls and displays, the receiver input connections. the measurement marker controls,
and the frequency counter display. The upper case contains the dual trace CRT, the measurement selection con-
trols, the measured value displays, and the electrical length controls and display. The boxed characters adja-
cent to the switches, buttons, and displays are HP-IB* addressing codes used when programming the instrument.
Block Diagram Description
The source produces leveled RF for the test device and a tracking local oscillator signal to the receivers.
Reference [R) and test [A and B) inputs from the testsetup are down-converted to 100 kHz IF frequency for ap-
plication to the detectors. This combination of two identical fixed oscillators, which are phase-locked to a com-
mon reference and offset by 100 kHz, with a Y1G-tuned swept oscillator provides continuous, very linear 3-%
decade frequency sweeps and the precise local oscillator tracking required for narrow bandwidth detection.
High reliability thin-film technology enables all three input mixers to have closely matched magnitude, phase,
and delay characteristics with full — 10 to ~ 110 dBm dynamic range and greater than 100 dB isolation between
inputs,
Transmission and reflection characteristics can be measured simultaneously by using two identical measure-
ment channels, one for the reference input and one switched between the A and B test inputs on alternate
sweeps. Completely independent magnitude, phase, delay, and polar detectors process the IF to DC levels for
multiplexing to the CRT display. The electronic line stretcher allows electrical length of the A and B test signal
paths to be independently matched to the reference signal path by adding or subtracting up to 1700 degrees of
linear phase shift per sweep prior to detection. This technique virtually eliminates the need for mechanical line
length adjustments and allows direct measurement of deviation from linear phase. The group delay detector
provides direct, calibrated measurement regardiess of sweep width or sweep rate.
Frequency, magnitude, phase, and delay are read directly from digital displays by positioning a measurement
marker to any point on the trace. Frequency at the marker is measured using a new up-down counter which
measures the local oscillator frequency and subtracts the 100 kHz offset. This technique provides up to 100 Hz
resolution and +2 count accuracy without the need to stop the sweep at the marker. Magnitude, phase, and
delay values are measured by sampling the selected detector outputs at the marker position. An autoranging
voltmeter displays the measured value with up to 0.01 dB, 0.1 degree, and 0.1 nanosecond resolution.
*HP.IB, the Hewlett-Packard Interface Bus, is Hewiett-Packards implementation of IEEE 488.
INTRODUCTION
The following test sets are designed especially for use with the 8505.
For precision transmission tests, or ratio tests using a stan-
dard device as a reference, the 11851A RF Cable Kit and
11850A (509) or 11850B (7592) Power Splitter provide the
necessary RF connections and shielding with excellent
magnitude and phase tracking characteristics over the 8505 fre-
quency range. The 11850B includes three 509 10 759 Моде!
11852A minimum loss pads.
11850A/8B Three-Way Power Splitter
The 8502A (5092) or 8502B (7592) Transmission/Reflection
Test Set contains a power splitter and directional bridge allow-
ing simuitaneous transmission and reflection measurements. It
also includes a 0 to 70 dB, 10 dB step attenuator which allows
control of the incident signal level independent from the
reference signal level. The 85028 includes one 50Q to 75Q
Model 11852A minimum loss pad.
8502 A Transmission/Reflection Test Set
Transmission and reflection measurements on two port
devices which require measurement of both forward and
reverse characteristics can be accomplished easily using the
85034 (502) or 8503B (750) S-Parameter Test Set. With this test
set and included cables, measurement of both forward and
reverse characteristics can be accompiished without
disconnecting and reversing the test device. DC bias connec-
tions for transistor testing are provided.
8503A S-Parameter Test Set
500
e
RE Input -
500 16,70 500
© 500)
Sa,
11850A 500
== 9.5 dB Loss Each Path
750
1
8F Input
500} 750
o NAAA DE
“Eh
11859B 750
== 7,8 dB Loss Each Path
3 bOR
7 Reference
> 500 Test
500
+ Reflection
DON
7 Heference
750) Test
4 500
“ Reflection
DC Bias
DC
R Blas А
DC Bias 8
INTRODUCTION
With a basic understanding of the instrument and these test sets in mind, follow this typical operating se-
quence for measuring transmission insertion loss or gain. Use a bandpass filter or similar device with known
characteristics. If you are not in front of an instrument, use the foldout at the rear of this note to locate the con-
trols. This introductory sequence assumes measurements are made using the 8502 test set, or an 8503 test set
with the front panel S-PARAMETER SELECT switch set to FORWARD.
Connect Tes! Sel — See connection diagram. Do not connect the test device.
E505A
Sig. Processor Sig. Processor
Inter-Conn. Inter-Conn.
Freq. Controi/ | | Freg. Control/
Test Set inter Conn E:
Test Device Test Device
Sel Signal Levels — Set the INPUT LEVEL dBm MAX switch to — 10. Use the OUTPUT LEVEL dBm and VER-
NIER to set the approximate signal levels to the test device. (Refer to the Power Level Measurements sequence
on page 25 to measure the absolute power, if necessary.)
Select Mensurernent — Set CHANNEL 1 INPUT switch to B/R to select transmission, MODE to MAG to select
magnitude ratio, and SCALE/DIV to 10 dB/division. Set CHANNEL 2 MODE and ELECTRICAL LENGTH MODE
to OFF.
Set CRT Display — Press to detent REF LINE POSN/BEAM CENTER to display reference line, then use CH1 y to
set reference line to desired position, usually center screen. Set TRIGGER to AUTO,
Set Froquency Sweep — Set RANGE MHz to lowest range that includes frequency range of interest, Set sweeper
MODE to LIN EXPAND, and WIDTH to START/STOP 1. Now use the FREQUENCY controls below the FRE-
QUENCY MHz displays to set the end points of the frequency sweep. Read the end points of the frequency sweep
from the FREQUENCY MHz displays.
Calibrate — Connect through. Set MARKERS switch to position 1, then use the adjacent vernier to set upward-
pointing measurement marker to desired calibration frequency. Press CHANNEL 1 MKR. then press and hold
7RO until the iterative zero process is complete and the trace moves to the reference line. This establishes test
set response at 0 dB insertion loss or gain.
Connect Test Device — See connection diagram,
Bend Measured Value — Use the MARKERS 1 vernier to position the measurement marker to any point on the
trace. If necessary to position the trace for viewing, use the CH1 & control or the CHANNEL 1 REF OFFSET but-
tons [A moves trace up, V moves trace down). Read the frequency at the measurement marker from the FREQ
COUNTER MHz display. Press the CHANNEL 1 REF button to display value of the reference line, then press
MKR to display marker displacement from the reference line. The measured value (dB) is the sum of the REF
and MKR values.
The following paragraphs describe the functions of the controls used in these steps in more detail.
INTRODUCTION
IAS
Set Sweeper Output Level
The OUTPUT LEVEL attenuator and VERNIER set the | ава
sweeper output level at the RF connector to any level from +10 7 a a
to —72 dBm. The sum of the rotary switch and the VERNIER
setting is the RF output level, +1 dB. If the OUTPUT controls
are set to — 30 and — 6, then the level at the RF connector will
be —36 (+1) dBm.
Set Reference and Test Channels Input Level
The maximum signal level which can be applied to the R, A, INPUT
or B inputs is either —10 dBm or — 30 dBm depending upon the INPUT LEVEL
INPUT LEVEL dBm MAX switch setting. If the signal level at dBm MAX
-16 —30
any input is greater than the switch setting the R, A, or B |
OVERLOAD indicator on the dark panel above the switch will |
light to show that the input signal is near the compression point
for the input mixer and measurement errors may result.
The switch is normally set at the — 10 position. When making measurements in which the A or B inputs are
below about —80 dBm and the R input is below — 30 dBm, set the INPUT LEVEL dBm MAX switch to the — 30
position. Selecting — 30 increases the signal level into the detectors {and adds appropriate display compensa-
tion) thus reducing the magnitude, phase, and delay measurement uncertainties for low signal level
measurements,
Signal Level Considerations
Example 1 Example 2
Minimum measurement uncertainty is achieved when the in- 10 png A :
put levels are near maximum. For example, when the test input
drops from — 20 dBm to — 100 dBm, the magnitude ratio uncer- -20 |
tainty increases from + 0.01 dB to +4.0 dB. The R, A, and B in-
puts are identical, each with ~10 dBm to — 110 dBm of range, ~30
thus allowing measurements to be made with 100 dB dynamic
range. But, for best results in ratio measurements, the test input Mrs ee ;
should be above —110 dBm for magnitude, —100 dBm for E
phase, and — 90 dBm for delay, = —50
The reference input level should remain constant for calibra- ©
tion and measurement. The test input level at calibration deter- к ME Re T
mines the gain and insertion loss range available for measure- $ 70 |
ment without overload or excessive measurement uncertainty. Е
Two examples are shown in this chart. Example (1) represents sl... | | | see L.
calibration levels for a passive device with both reference and
test inputs at —10 dBm. When calibrated at this level the 8505 во O LL
can measure the test device magnitude ratio to over 100 dB in-
sertion loss. Example (2) represents calibration signal levels a ss
for an active device, It shows the reference level set to — 10 dBm
and the test channel set to —50 dBm. At these levels the 10
magnitude ratio can be measured to 40 dB of gain and to over 7 Noise Floor 10 kHz BW
60 dB for insertion loss.
At low signal levels measurement uncertainty is seen as noise on the CRT trace. Select the 1 kHz IF bandwidth
(the 1 kHz button to the right of the CRT) to reduce the pre-detection bandwidth and improve the signal-to-noise
ratio into the detectors. Select the VIDEO FILTER to reduce the post-detection bandwidth and thus reduce the
residual uncertainty caused by detector noise. Slower scan time may be required.
6
INTRODUCTION
The CHANNEL 1 and CHANNEL 2 MODE and INPUT swit- INPUT
ches function independently to select the measurement ао
displayed on the CRT. This illustration shows the display for- =
mat and measurement selected for each combination of MODE | MODE — POLAR +
and INPUT switch settings for either channel when the R input OFF MAG PHASE DLY MAG PHASE
the transmitted signal.
MODE
MAG PHASE BLY MAG PHASE
i
Mag Phase
vs
Frequency
GR NE ea ЭВА СЛАВА
insertion Phase, ©
7 Devition tom
< Linear Phase; —:o.—.
— Electrical Length, ©
RJR
— Refiection Phase ——_
age. 000 Tm o |
— Frecguency fn Freguenoy ——— Bi
SU nsertion Loss, 1,
SEE еее
ua не
ae (Вт — >
E Degreos Be
©
Ргеднейсу — ———# Frequency
Complex Reflection Coefficient,
B/R,
Complex Transmission Coefficient
The MAG. PHASE. and DLY selections use the cartesian display; POLAR MAG and POLAR PHASE use the
polar format. R, A, and B INPUT positions can only be selected with MODE in MAG. The MODE switch also
selects the appropriate dB, degrees, microsecond or nanosecond units indicator near the measured value LED
display. The CRT trace is identical for both POLAR MAG and POLAR PHASE selections. In POLAR MAG the dB
ratio at the marker is displayed and in POLAR PHASE the phase angle at the marker is displayed.
For A/R and B/R INPUT selections, the CRT trace and the measured value is always presented as the ratio of
the test channel to the reference channel.
The SCALE/DIV switch uses four scales. The MAG, PHASE, SCALE/DIV
and DLY scales set the value per division on the cartesian MAG 20 10 5 2 1 5 2
display; the POLAR FULL scale establishes the linear trans- PHASE EE namas :
mission or reflection coefficient value of the polar display outer E MD СН ОНеНН 3 [130 MHz
circle. Note that the DLY scale uses additional scaling factors POLAR FUIT 5 2 10050 ohne
which depend on the RANGE MHz switch position.
As an exercise, connect the RF output directly to one of the R, À, or B input connectors. Set the INPUT LEVEL
dBm MAX switch to —10, the OUTPUT LEVEL dBm VERNIER to —12, and the OUTPUT LEVEL dBm attenuator
to — 16. Rotate the VERNIER toward zero and note the setting at which the OVERLOAD indicator lights. This is
the simplest operator check you can make on the source and receiver. The OVERLOAD indicator lights at about
+72 dB of the INPUT LEVEL switch setting. Make this test at each of the R, A, and B inputs using the — 10 and/or
the — 30 input switch settings.
To observe the CRT trace, set CHANNEL 1 or CHANNEL 2 to R, A, or B MAG, set SCALE/DIV to 10 dB/divi-
sion and repeat the above exercise. If the trace does not appear, set the CRT display as described on the next
page.
INTRODUCTION
SET CRT DISPLAY
Pressing to detent the REF LINE POSN/BEAM CENTER button displays the cartesian reference line or the
polar beam center during the sweep retrace. Standard controls are used for beam focus, beam intensity, scale il-
lumination, and trace align. This illustration presents a sequence for setting the cartesian reference line and
polar beam center positions.
Depress REF LINE POSN/BEAM CENTER button
CHANNEL 2 MODE: OFF
CHANNEL 1: R, MAG
(Use SCALE/DIV switch or press REF OFFSET to move CRT trace
away from reference line)
CH1 $ to position reference line
CHANNEL 1: POLAR MAG
POL «4 and POL $ to center beam
CHANNEL 1 MODE: OFF
CHANNEL 2: R, MAG
CH2 $ to position reference line
Press to release REF LINE POSN/BEAM CENTER
{may be left depressed)
For the cartesian display, the reference line is the position
from which SCALE/DIV expands or contracts the trace. The Scale/Div.
value of the reference line is initially zero dB, degrees or 5 ? 0 Na
seconds and the trace is positioned above or below the : La La
reference line depending upon whether the response -6 3
characteristic is positive or negative. Г
-0 ho
The reference line can be set to any position on the CRT at
any time using the CH1 $ and CH2 $ controls without disturb-
ing the calibration values.
--2 -—1
To continue the previous exercise, press to detent the REF
LINE POSN/BEAM CENTER button and move the reference line
to the center CRT graticule line. Connect the test set, and set
CHANNEL 1 or CHANNEL 2 INPUT to R, A, or B and set MODE
to MAG. If the REL indicator near the measured value display is
lit, press and hold the CLR button until REL goes out (= 2
seconds at each INPUT position). Read the power at the R, A,
and B inputs from the CRT display by assuming that the
reference line is 0 dBm and noting the trace position with
respect to the reference line.
Cartesian Dispiay
For the polar display, reflection and transmission coefficient
values can be read directly from the polar graticule. For
magnitude ratio, the beam center position is the point of zero + 90 Degrees
reflection coefficient {infinite dB return loss) and zero transmis- E
sion coefficient [infinite dB insertion loss}. The outer circle is
the magnitude ratio reference line, having a linear coefficient
value corresponding to the SCALE/DIV POLAR FULL selection.
At POLAR FULL 1 {and zero dB REF OFFSET) the outer circle
represents a reflection coefficient magnitude of 1 (0 dB return
loss) and transmission coefficient magnitude of 1 {0 dB insertion
loss). For phase angle, the zero degrees reference line is the right
hand intersection of the center line and the concentric circles
and is scaled from zero to + 180 degrees. Polar Display
4 Polar Fuli
4180 Degrees : 0 Degrees
Zero Magnitude
Hatio
G0 Degrees
INTRODUCTION
Frequency sweep is controlled by the RANGE MHz, MODE, and WIDTH switches. RANGE MHz selects the
frequency range. MODE selects logarithmic or linear full sweep, or the linear expanded sweep selected by
WIDTH. You can set and store an independent expanded sweep at each of the WIDTH switch START/STOP 1,
START/STOP 2, and CW + AF positions using the FREQUENCY MHz displays and FREQUENCY controls. To
familiarize yourself with operation of the sweeper frequency controls, follow this sequence.
LEN FULL DISPLAY
Select LOG FULL or LIN FULL and cartesian
display. Down-pointing markers are displayed ac-
cording to WIDTH.
WIDTH to START/STOP 1. Position markers using
START and STOP FREQUENCY controls,
WIDTH to START/STOP 2. Position markers using
START and STOP FREQUENCY controls.
WIDTH to CW + AF. Set + AF markers using + AF
FREQUENCY control; center £ AF markers on
area of interest using CW FREQUENCY control.
Set MODE to LIN EXPAND and select scan
using WIDTH. FREQUENCY controls are
All frequency markers are shown here; operative in alt WIDTH positions except ALT.
actualiy only the selected markers are displayed.
LiN EXPAND
START/STOP 1 START/STOP 2 ALT CW + AF
In LOG FULL. the full selected frequency range is swept with a logarithmic frequency axis. (The log sweep
end points are identified above the RANGE MHz switch and log frequency graticule overlays are available.) LIN
FULL selects a linear sweep of the full selected frequency range {500 kHz to 13, 130, or 1300 MHz}. In the full
sweep modes selecting one of the START/STOP or CW +AF places two down-pointing frequency markers on the
CRT trace to identify the sweep end points. The FREQUENCY controls position these markers; each adjacent
VERNIER provides fine adjustment but does not change the FREQUENCY MHz displays.
For ALT, CHANNEL 1 displays the START/STOP 1 sweep and CHANNEL 2 displays the START/STOP 2
sweep. The FREQUENCY MHz displays and the FREQ COUNTER MHz display readings apply to the
START/STOP 1 sweep unless CHANNEL 1 is off. in which case the readings apply to the CHANNEL 2 sweep. For
CW, the frequency counter measures the actual CW frequency and displays it using the left-hand six-digit FRE-
QUENCY MHz display.
In START/STOP and CW + AF the FREQUENCY MHz displays do not have counter accuracy and thus should
not be used for other than setting approximate frequency sweep widths. Residual FM performance is improved
in the lower RANGE MHz settings, so select the lowest setting which includes the frequency range of interest for
your measurement. The frequency controls can be set so that the start frequency is above the stop frequency.
but degraded sweep linearity will reduce the accuracy of the measured frequency and group delay values.
Sel Sweep Time
Time for a complete sweep of the selected frequency range is selected by the SCAN TIME SEC switch and ad-
jacent VERNIER. Select the fastest sweep time then decrease until there is no distortion of the test device
response. The vernier allows continuous adjustment within the selected range.
9
INTRODUCTION
The general sequence to read the measured value at a par-
ticular point on the CRT trace is as follows.
pr REF OF
pe
Measured Value Display
Use REF OFFSET buitons and SCALE/DIV switch to position CRT trace on the screen.
Select one of the five measurement markers using the MARKERS switch, then position the marker
on the CRT trace at the point to be measured using the adjacent numbered vernier.
Read the frequency at the measurement marker from the FREQ COUNTER MHz display.
Press REF button and read the value of the reference line. Press MKR button and read the marker
displacement from the reference line. Add the REF and MKR values to obtaín the measured value af
the measurement marker.
REF and MER Value Display Modes
When the REF button is pressed, the measured value display shows the value assigned to the reference line. When the
MKR button is pressed the measured value display shows the displacement of the selected measurement marker from
the reference line. The magnitude, phase, or delay value at any point on the CRT trace is then:
REF value + MKR value = Measured Value
It REF OFFSET has not been used to position trace, REF will equal zero and the MKR value alone represents the
measured value.
REL OFFSET
Pressing any REF OFFSET button increments the reference
line value for that channel, thus moving the CRT trace in rela-
tion to the reference line. Holding a REF OFFSET button pressed ones Ge A i
increments the associated LED numeral at the rate of about two ВЕ = к
digits per second. Momentarily pressing the CLR button resets Ry Trace 7 = Bh
the reference line value for that channel to zero. Coarse Medium Fine
There is no accuracy advantage in moving the CRT trace closer to the reference line to make the measure-
ment. In fact, the MKR value is correct even when the CRT trace and the measurement marker are positioned
off screen, However, when the SCALE/DIV switch is at one of the four right-hand positions and the REF or MKR
value is less than about 8 dB, 80 degrees, or 8 delay units, the displayed REF or MKR value gains an additional
decimal digit of resolution. To see this change, select MKR mode, move SCALE/DIV to one of the four right-hand
positions, and use REF OFFSET to move the CRT trace toward and away from the reference line.
10
INTRODUCTION
Using REF OFFSET, the magnitude. phase, and delay trace positions can be set independently. The REF value
is stored in six independent Reference Offset registers; three for each channel, one for each of the MAG, PHASE,
and DLY selections. {The POLAR MAG position shares the same Reference Offset register as the MAG position
and POLAR PHASE shares the PHASE register.)
frequency Counter
The FREQ COUNTER MHz display indicates the frequency in
MHz at the selected measurement marker in all sweep modes
except CW. In CW, the counter uses the left-hand FREQUENCY
MHz display to indicate the CW frequency.
Resolution of the FREQ COUNTER MHz display is controlled
by RANGE MHz and SCAN TIME SEC selections. Slow sweep
times allow greater counter resolution, shift one or more digits
off the left of the display and cause the display OVERFLOW in-
dicator to light. To obtain six digit counter resolution, move
SCAN TIME SEC to a faster sweep position to inspect the most
significant digits, then to a slower sweep position to inspect the
least significant digits.
When the MARKERS rotary switch is moved to positions 2
through 5, all lower numbered markers are displayed on the
CRT trace pointing down. The selected measurement marker
points up.
Polar Display
The CRT trace is the same for both POLAR MAG and POLAR
PHASE selections. The measured value display reads the POLAR
magnitude ratio at the measurement marker in POLAR MAG pe Frist
and the phase angle at the measurement marker in POLAR
PHASE.
MAGNITUDE PHASE
—18 dB
For POLAR MAG, the displayed measured value is the same 201 MHz £
dB ratio as indicated for the MAG selection. The magnitude
part of the linear coefficient can be read from the concentric
circles of the polar graticule, or calculated using the REF +
MKR dB value and the HP Reflectometer Calculator (HP p/n
5952-0948) or the following equation:
Measured Value
тогр = 10Р whereD=
20
Where r and p represent the magnitude part of the linear transmission or reflection coefficient, respectively,
and Measured Value (dB) represents the REF + MKR value. For example if the REF + MKR value is — 15 dB, the
magnitude part of the linear coefficient is 0.178.
The phase value of the linear coefficient, £4, is read from the radial lines of the polar graticule, or by selecting
POLAR PHASE and reading the REF + MKR value from the measured value display.
11
INTRODUCTION
Measurements on a test device are made relative to a measurement standard with known response
characteristics. Calibration establishes the offsets required to obtain a correct measured value for the measure-
ment standard using the same test set-up as will be used for measurements on the test device.
The calibration standard for transmission measurements is a ‘through’ connection {connect the points at
which the test device will be connected). Complete transmission calibration sets the magnitude ratio between
the transmitted and reference signals to unity (0 dB), equalizes any electrical length difference between the
transmitted and reference signal paths, sets the phase to zero degrees, and the group delay to zero seconds. This
establishes the transmission coefficient of the test set-up as 1 £ 0° with zero seconds group delay, the theoretical
value for a zero-length transmission line.
The calibration standard for reflection measurements is normally a short circuit connected at the measure-
ment plane {the point at which the test device will be connected). Complete reflection calibration sets the
magnitude ratio between the reflected and reference signals to unity (0 dB), equalizes any electrical length dif-
ference between the reflected and reference signal paths, and sets the phase to 180 degrees. This establishes the
reflection coefficient of the test setas 12 180°, the theoretical value for a short circuit,
Calibration values are stored in independent Stored Reference Offset registers, one for each measurement
category. Thus, vou can perform calibration for transmission and reflection magnitude, phase, and delay in se-
quence prior to measurement. Calibration values are shared by CHANNEL 1 and CHANNEL 2 so calibration us-
ing one measurement channel serves for both. Also, calibration values for magnitude and phase are shared by
the cartesian and polar display modes so calibration using one display mode serves for both. Calibration values
remain stored for as long as power is applied to the instrument or until manually cleared or changed.
ZRO buttons for CHANNEL 1 and CHANNEL 2 provide the magnitude, phase, and delay calibration function.
Operation of the ZRO button depends upon the MKR or REF display mode selection. The MKR, ZRO sequence is
used to establish a zero reference, as for magnitude, transmission phase, and delay calibrations. MKR, ZRO
stores the offset required to move the measurement marker and trace to the reference line. The REF, ZRO se-
quence is used to establish a non-zero reference, as for the + or — 180 degree phase offset required for reflec-
tion phase calibration.
The REL indicator above the display lights to show that a calibration offset is stored and that the measured
value is relative to the calibration standard. Pressing and holding CLR for about one second clears the stored
calibration and extinguishes the REL indicator.
12
INTRODUCTION
MIKR, ZERO
To calibrate using MKR, ZRO, select the measurement mode, select MKR, then press and hold ZRO until the
iterative process which moves the marker to the reference line and zeros the measured value display is com-
plete [2 or 3 sweeps). Now the measurement marker is positioned on the reference line and the MKR and REF
values are both zero. The process assigns the reference line the value of zero. then stores the offset required to
move the measurement marker to the reference line. This is an example of MKR, ZRO operation for magnitude
calibration using a simple transmission test set with a through connection.
В/В dB magnitude ratio:
= B dBm —R dBm
= — dBm — (— 18 dBm}
= +12dB
B/R, MAG measured value:
= В/В (В — Stored calibration
reference offset.
Before calibration:
= +12 dB — 0.00
= +12 dB
After MKR, ZRO calibration:
= +12dB — (+12)
= 0.00 dB
Calibration should be accomplished at higher than or equal to the resolution at which the measurement is to
be made. Thus, if high resolution measurements are made, calibration should proceed as a two-step process.
First set SCALE/DIV to one of the four left-hand positions, press MKR, then hold ZRO pressed until the display is
zero. Now move SCALE/DIV to one of the four right-hand {high resolution) positions and hold ZRO pressed until
the display is zero again. Notice that the display decimal point moves one digit to the left during the second step.
Offset values in the calibration registers cannot be displayed. It is not necessary to examine the calibration
value following calibration because the value only represents the offset value necessary to remove the test set
losses and offsets from the measurement. The absolute value of the measurement is the sum of the calibration
offset value. the REF value. and the MKR value, but the instrument automatically subtracts the calibration
value from the measurement and the test device response characteristic is represented by the MKR + REF value
alone,
Each time ZRO is pressed, a new calibration offset is stored. Thus, for example, if the measurement marker is
not at the correct calibration frequency the first time ZRO is pressed, the marker can be moved and ZRO
pressed again. Normally, use ZRO only at calibration. CLR can be pressed momentarily to clear the displayed
REF value, but holding it for about one second will clear the calibration offset value. Pressing and holding CLR
until the REL indicator goes out will make re-calibration necessary.
13
INTRODUCTION
Electrical length is equal in the reference and test signal paths when the linear insertion phase response does
not vary (is constant) over the frequency sweep of interest. Constant insertion phase is identified by a flat trace
in a cartesian measurement, or a small cluster in a polar measurement,
НГ
Reference Phase Polar Phase Reference Phase Folar Phase
—u
NN 7
=“
Detector:
Detector!
Swept у Swept ETE
Source 3 Source A <
Equal Electrical Length. Phase relationship constant with frequency. Unequal Electrical Length. Phase relationship shows linear variation
with frequency.
On the ELECTRICAL LENGTH part of the control panel, IN-
PUT selects display of the electrical length added to or sub-
tracted from the reference signal path to equalize the A or B test
signal path. There are two Electrical Length Offset registers, one
for A and one for B. The LENGTH pushbuttons increment the
register selected by INPUT, allowing independent equalization
of the two test signal paths. Momentarily pressing the CLR but-
ton sets the selected register and display to zero. The A and B
VERNIERS allow fine length adjustment without changing the
LENGTH display or the value stored in the A or B electrical
length register. Setting MODE to OFF removes the line length
equalization for the test signal path selected by INPUT. Move
the INPUT switch to the other position to deselect length for
both channels.
The MODE switch selects the units for electrical length, When MODE is set to x1 and x10, electrical length is
introduced in units of meters or centimeters of equivalent air line as shown by the m or em indicator above the
display. When MODE is set to PHASE x10°/SCAN, ten times the displayed degrees of phase shift is introduced
over the selected frequency sweep. The linear insertion phase added or subtracted is zero at the beginning of the
frequency sweep, increasing linearly to ten times the display degrees at the end of the sweep. This degrees/scan
mode allows greater range than the x1 or x10 MODE selection and is usually required for devices with long elec-
trical length.
in the PHASE x10°/SCAN MODE, equivalent electrical length can be calculated from the displayed value us-
ing the following computation,
phase change (degrees) x 3 x 10° meters/sec
electrical length (meters)
sweep width (Hertz) 360 degrees/cycle
display value x (10)
sweep width (MHz) x 1.2
where display value represents the ELECTRICAL LENGTH display reading, and sweep width represents the
total selected frequency sweep in MHz. For example, if it is necessary to add +1350 degrees to flatten the phase
response trace and the frequency sweep is from 1100 to 1110 MHz, the equivalent electrical length compensa-
tion is:
(meters) = +1550 = +112.50 meters
(1119-1100) 1.2
Electrical length calibration is accomplished by selecting the A or B input, equalizing the electrical length
with the calibration standard connected, then pressing the ELECTRICAL LENGTH ZRO button, The displayed
value is stored in the selected Stored Electrical Length register as the calibration electrical length offset, and the
display is set to zero. The REL indicator lights to indicate that a non-zero calibration value is stored and that the
display value is relative to the calibration value. Press and hold CLR until the REL light goes out to reset the
stored calibration value to zero. Each time ZRO is pressed, the displayed value is added to the stored calibration
value.
14
This section describes transmission insertion loss and gain, insertion phase, electrical length, deviation from
linear phase, and group delay measurements. These measurements are described individually, each with
separate setup, calibration, and measurement sequences. For a generalized calibration sequence for all
transmission measurements, refer to the S-Parameter Measurements, General Calibration Sequence. Below is a
diagram of transmission test connections using the 8502 Transmission/Reflection Test Set.
85004
1
RF Input
Ar A 2 с с
| 9) S ©
к Е]
` } \
Incident To Reflected to L Transmitied to input B
7 ii = Input A input À %
Through to Calibrate
Connections to the test set and test device are made using the cables supplied in the 11851 À Cable Kit. The
test device input port is connected to the 8502 front panel TEST connector. For transmission calibration, the
cable which connects to the device output is connected to the 8502 TEST output. Whatever configuration is
used, all cables, adapters, and fixtures required for the measurement should also be used for calibration.
15
TRANSMISSION MEASUREMENTS
This sequence lists the steps for a typical insertion loss or gain measurement,
SETUP
Set signal levels
Set frequency sweep
Set CRT display
MARKERS: 1, position measurement marker so FREQ COUNTER MHz reads desired
calibration frequency.
CALIBRATION
Connect through,
CHANNEL 1:
B/R, MAG, 10 dB/division,
MKR, ZRO (hold until display zero).
MEASUREMENT
Connect test device, MKR, ZRO moves marker to reference line,
Position measurement marker to read magnitude ratio
(MKR + REF) and frequency.
Calibration for insertion loss and gain measurement sets the magnitude ratio between the transmitted and
reference signals to zero dB with the through connection. After connecting the test device, a negative measured
value indicates insertion loss; a positive measured value indicates gain. Take care to choose signal levels to
achieve maximum dynamic range {see page 8).
This figure shows a display of the magnitude ratio response of a bandpass filter. The measurement marker is
positioned to the minimum insertion loss point in the passband. For this measurement no REF OFFSET has been
added (the 0 dB reference line is positioned at the top graticule using CH1 $ or CH2 4) so the displayed MKR
value represents the insertion loss.
MKR dB
— E
FREO COUNTER MHz
—F00 Cue
Relative Measurements
To measure the difference between two points on the trace, select MKR display mode, position the measure-
ment marker to the first point, add or subtract REF OFFSET to make the MKR reading zero, then move the
marker to the second point. The MKR reading at the second point represents the difference between the two
points. Calibration is retained using this sequence and the measured value always represents the sum of the REF
and MKR values at any point.
16
TRANSMISSION MEASUREMENTS
The same operation can be performed without preserving the original calibration value by positioning the
marker to the first point, pressing MKR then ZRO (hold until display zero), the moving the marker to the second
point. Using this sequence, a new calibration value is stored and all further measured value readings (REF +
MKR] will be relative to the first point instead of the original calibration value.
Thus, both sequences are equivalent, but the first sequence retains the original calibration value. These se-
quences can also be used for magnitude, phase, and delay measurements.
03 Frequencies
For example, the insertion loss or gain measurement sequence can be extended to measure the 3 dB points of
the filter.
SCALE/DIV: 1 dB/division.
Set frequency sweep to center the passband trace with 3 db points visible.
Position measurement marker to center of passband or minimum insertion loss point.
MKR, then use REF OFFSET so MKR value is zero.
Move marker so MKR value is — 3.00 dB.
Read frequency from FREQ COUNTER MHz.
Move marker to other 3 dB point and read frequency.
CLR {momentarily} to remove REF OFFSET. -
Be sure to press CLR momentarily; if held for more than about one second, the REL light will go out indicating
that the stored calibration offset has been cleared and recalibration is necessary.
Gain Compression
A sequence similar to that above can be used to measure the 1 dB gain compression output power.
Position measurement marker to frequency of interest.
OUTPUT LEVEL dBm and VERNIER to increase incident power level until magnitude ratio begins to
decrease.
MKR, then use REF OFFSET so MKR value is zero.
Increase incident power until MKR value is — 1 dB.
The amplifier output level can be estimated by summing the amplifier gain and sweeper output power, then
subtracting test set transmission loss. A more precise measurement can be made by connecting the test device
output directly to the B input and measuring the absolute power level by selecting B, MAG (see page 25).
17
TRANSMISSION MEASUREMENTS
This sequence lists the steps for a typical insertion phase measurement.
SETUP
Set signal levels.
Set frequency sweep.
Set CRT display.
MARKERS: 1, position measurement marker so FREQ COUNTER MHz reads desired
calibration frequency.
CALIBRATION
Connect through.
CHANNEL 1:
B/R, PHASE, 90 degrees/division.
ELECTRICAL LENGTH:
B, MODE as required {usually x1 or x10),
CLR if REL lighted,
LENGTH AND VERNIER B for flat response.
CHANNEL 1: | Center marker, press MKR, then press and hold
MKR, ZRO {hold until display zero). CHANNEL 1 ZRO while adjusting LENGTH.
MEASUREMENT
Connect test device.
Electrical length MODE (and sweep width if PHASE x10°/SCAN selected) same as calibration.
Position measurement marker to read insertion phase (MKR + REF) and frequency.
This figure shows a bandpass filter insertion phase. The
8505A phase measurement range is + 180 to — 180 degrees, and
the vertical line represents the transition between these values.
Thus, the trace between any two of these transition lines
represents 360 degrees of phase shift.
"a
— 180
To illustrate the display format, determine the total phase shift for the selected sweep width as follows: Posi-
tion the measurement marker as far to the left as possible before the FREQ COUNTER MHz display blanks.
Read the phase value {+100° in this example) and determine the total number of degrees before the first transi-
tion trace (100 + 180). Next count the second and following transition traces and multiply by 360 (2 x 360). Now
determine the number of degrees from the last transition trace to the right edge of the screen [180 + 60). The
sum of these values represents the total phase shift over the frequency sweep.
(100 + 180) + {3 x 360) + (180 + 60) = 16009
When the transmitted signal is below the noise floor for insertion phase measurements the CRT trace usually |
reads zero degrees. -
18
TRANSMISSION MEASUREMENTS
This sequence lists the steps for a typical measurement of equivalent electrical length.
SETUP
Set signal levels,
Set frequency sweep,
Set CRT display.
CALIBRATION
Connect through
CHANNEL 1:
B/R, PHASE, 90 degrees/division
ELECTRICAL LENGTH:
5, MODE as required (usually PHASE x10°/SCAN},
CLR if REL lighted,
LENGTH and VERNIER B for flat response,
ZRO.
MEASUREMENT
Connect test device
Electrical length MODE (and sweep width if PHASE x10°/SCAN selected
must be same as calibration.
ELECTRICAL LENGTH:
LENGTH for flat response over frequency range of interest. If MODE set to x1 or x10 read
equivalent electrical length of test device from ELECTRICAL LENGTH display, or, if MODE
set to PHASE x 10°/SCAN, calculate equivalent electrical length of test device using
Center marker, press MKR, then press and hold
CHANNEL + ZRO while adjusting LENGTH,
display value x 10
sweep width (MHz) x 1.2
meters =
This measurement determines the linear insertion phase required to equalize the electrical length of the
reference and test channels with the test device installed. Note that if PHASE x10°/SCAN is selected the sweep
width cannot be changed without affecting the calibration; if x1 or x10 is selected, changing sweep width does
not affect calibration. To avoid the electrical length calculation required when the PHASE x10°/SCAN mode is
selected, measure electrical length with a frequency sweep width of 8.333 MHz. With this sweep width, the
ELECTRICAL LENGTH display reads the length in centimeters directly.
The wide range of the electrical length controls allow great latitude in the test setup, but you should recognize
the limitations. For best accuracy in phase and electrical length measurements the maximum values listed
below for electrical length should not be exceeded.
PLECTRICAL RANGE Miz
LENGTH MODE 0.5 -13 0.5 - 130 0.5 - 1300
x1 +19.9m +1,99 m +19.9 cm
x10 +100 m +10.0m +100 ст
PHASE x10°/SCAN +1700° +1700° +1700°
The values represent the sum of the calibration value and any length added during the measurement. Above
these values insertion phase linearity is degraded.
19
TRANSMISSION MEASUREMENTS
This sequence lists the steps for a typical measurement of deviation from linear phase.
SETUP
Set signal levels.
Set frequency sweep.
Set CRT display.
CALIBRATION
Connect through.
CHANNEL 1:
E/R, PHASE, 90 degrees/division.
ELECTRICAL LENGTH:
B, MODE as required (usually PHASE x10°/SCAN},
CLR if REL lighted,
LENGTH AND VERNIER B for flat response.
MEASUREMENT
Connect test device.
Electrical length MODE {and sweep width if PHASE x10°/SCAN selected) must be same as
calibration.
ELECTRICAL LENGTH:
LENGTH and VERNIER B for flat phase response in frequency range of interest,
Position measurement marker to read phase deviation.
Center marker, press MKR, then press and hold
CHANNEL 1 ZRO white adjusting LENGTH,
Measuring deviation from linear phase is an alternative to measuring group delay made possible by the range
of the 8505 electronic line stretcher, Insertion phase consists of two components, linear and non-linear. Devia-
tion from linear phase is a measure of the non-linear component of insertion phase. By compensating for the
linear insertion phase component using the electrical length controls, the deviation from linear phase over the
frequency sweep can be measured directly. Compared to group delay, deviation from linear phase is a fun-
damental measurement because delay is the derivative of phase change with frequency. Also, greater phase sen-
sitivity allows a greater dynamic range than group delay measurements, and deviation from linear phase will
produce greater detail in areas where the phase response changes rapidly over a small frequency change.
This figure shows how introducing linear insertion phase (electrical length) allows determination of non-
linear insertion phase.
Deviation From
Electrical Length Added Linear Phase Response
Note that the same maximum electrical length considerations as for the electrical length measurements (page
19} must be observed. If the network exhibits large phase changes with frequency, reduce the sweep width and
make a series of measurements over the frequency range of interest. This example shows the deviation from
linear phase of a bandpass filter with markers at the 3 dB frequencies. Even if the network must be specified in
terms of group delay, the deviation from linear phase measurement serves as a good check of the actual phase
response. Using the dual-trace capability of the 8505A, compare deviation from linear phase with the network
group delay as described on the next page.
20
TRANSMISSION MEASUREMENTS
GROUP DELAY
This sequence lists the steps for a typical group delay measurement.
SETUP
Set signal levels.
Set frequency sweep.
Set CRT display.
MARKERS: 1, position measurement marker so FREQ COUNTER MHz reads desired
calibration frequency.
CALIBRATION
Connect through.
CHANNEL 1:
B/R, DLY, 100 nanoseconds/division,
MKR, ZRO (hold until display zero}.
MEASUREMENT
Connect test device.
Position measurement marker to read group delay
{MKR REF) and frequency.
MKR, ZRO moves marker to reference line.
A device with no phase distortion presents a linear insertion phase characteristic. Group delay will thus ap-
pear as a flat horizontal line. This figure shows that group delay varies as a function of frequency when the test
device exhibits deviation from linear phase,
d
tg = —— (sec) Non-Linear
Linear
Phase Angle
ый
Group Delay
Group Delay
Phase Angle
4 2 1 f2 fy 12 fy 2
With slow sweep times or narrow frequency sweeps the instrument switches from the continuous mode to a
sample mode in order to maintain the best signal-to-noise ratio for the measurement. Maximum sample rate is
1000 samples per second. If the test device bandwidth will permit fast sweeps, increase the sweep speed until
the instrument switches to the analog mode, then slow the sweep speed until just before the switch to sampling.
If not, slow to = 1 sec/sweep and use the sample mode with video filtering.
SEA
ETA
Continuous Mode. For best accuracy
siow sweep until just before sampling.
The maximum group delay which can be displayed depends upon the RANGE MHz selection as follows:
0.5-13, +80 microseconds: 0.5-130, +8 microseconds: and 0.5-1300, +800 nanoseconds and is the sum of the
calibration offset value and the actual measured value.
Sample Mode. For best accuracy slow
Sample Mode. Fast sweep means a small
to less than one second per sweep.
number of large sampies.
21
This section describes return loss and reflection coefficient measurements. These measurements are describ-
ed individually, each with separate setup, calibration, and measurement sequences. For a generalized calibra-
tion sequence for all reflection measurements, refer to the S-Parameter Measurements, General Calibration Se-
quence. Below is a diagram of reflection test connections using the 8502 Transmission/Reflection Test Set.
8505A,
|
:
© ©]
OO
| С e
} J
:8 J Incident To Reflected To
г input R Input À
41 Short Circuit
To Calibrate
RF Input
5—70 de
Attenuator
E
Test To Input
For best accuracy, terminate test device output with
high quality 500 or 750) Load
Connections to the test set and test device are made using the cables supplied in the 11851 À Cable Kit. The
test device input port is connected to the 8502 front panel TEST connector. For reflection calibration, connect
the short circuit at the same point to which the test device will be connected, Whatever configuration is used, all
cables, adapters, and fixtures required for the measurement should also be used during calibration.
22
REFLECTION MEASUREMENTS
LOSS
This sequence lists the steps for a typical return loss measurement.
SETUP
Set signal levels,
Set frequency sweep.
Set CRT display.
MARKERS: 1, position measurement marker so FREQ COUNTER MHz reads desired
calibration frequency.
CALIBRATION
Connect short,
CHANNEL 1:
A/R, MAG, 10 dB/division,
MKR, ZRO (hold until display zero). -—
MEASUREMENT
Connect test device. MKR, ZRO moves marker to reference line.
Position measurement marker to read magnitude ratio
(MKR + REF) and frequency.
Calibration for return loss sets the magnitude ratio between
the reflected and reference signals to zero dB with the short cir- MKR dB FREQ COUNTER MHz
cuit. After connecting the test device a negative value indicates
that the reflected signal magnitude is less than the reference
signal magnitude.
This figure shows a display of the return loss of a bandpass
filter. The measurement marker is positioned to the minimum
return loss point in the passband. The 0 dB reference line is set
to the center graticule using CH1 $ or CH2 $ and no REF OFF-
SET has been added, so the absolute value of the MKR reading
is the return loss measured value.
Standing wave ratio, SWR, can be calculated from the return loss measured value using the HP Reflectometer
Calculator or these equations:
measured value [dB)
р = 10" where D =
20
For example, if the measured magnitude ratio is — 30 dB, p is 0.032 andthe SWRis1.07, I=
23
REFLECTION MEASUREMENTS
This sequence lists the steps for a typical reflection coefficient measurement.
SETUP
Set signal levels.
Set frequency sweep.
Set CRT display, polar beam center.
MARKERS: 1, position measurement marker so FREQ
COUNTER MHz reads desired calibration frequency.
CALIBRATION
Connect short.
CHANNEL 1:
A/R, POLAR MAG, POLAR FULL 1,
MKR, ZRO (hold until display zero),
ELECTRICAL LENGTH:
A, MODE as required {usually xt or x10), CLR if REL
lighted, LENGTH and VERNIER A for smallest cluster.
CHANNEL 1:
POLAR PHASE.
MKR, ZRO (hold until display zero), | №
REF,
REF OFFSET so display reads + 1 80 degrees,
ZRO, у.
MKR.
MEASUREMENT
Connect test device,
Electrical length MODE (and sweep width if PHASE
x10°/SCAN selected) same as calibration.
Read p Z $ at any point from polar display or:
POLAR MAG,
Position measurement markers to read magnitude
ratio (MKR + REF) and frequency.
Calculate p using
р = 10° where D = return loss (df)
20
POLAR PHASE,
Read £ $ value (MKR+ REF),
MKR, ZRO moves marker to outer circie.
» LENGTH to shorten trace.
MKR, ZRO moves marker to zero degrees
reference fine,
REF OFFSET and REF ZRO moves marker to
+180 degrees,
Press Twice
г es
Ы
Press Twice
Impedance — Using Smith Chart
Impedance can be read directly from the polar display reflec-
tion coefficient by installing a Smith chart overlay. Smith chart
overlays are supplied with the 8505 in four versions, 3.16, 1.0,
0.5, 0.2, and 0.1 full scale linear coefficient value of the cuter
circle, For the 3.16 full scale version use REF OFFSET to set the
REF value to +10 dB in POLAR MAG and select POLAR FULL
1. For the other overlays, set the REF value to zero and select the
POLAR FULL value corresponding to the full scale value of the
Smith Chart.
24
MKR de MKR DEG FREQ COUNTER MHz
With the INPUT switch set to R, A, or B and the MODE switch set to MAG, the 8505 measures the absolute
power level in dBm at the R, A, or B input. Some applications for this capability are: measuring and setting ac-
tual reference, reflected and transmitted signal levels into the R, A, and B inputs prior to calibration: verifying
signal levels at various points in the test setup including actual incident and transmitted power; and direct
measurement of losses in the test set, cables, and fixtures.
В, А, ог В, МАС.
CLR (hold for 2 sec if REL lighted).
SCALE/DIV and REF OFFSET to position trace.
Position measurement marker to read measured dBm value (MKR + REF)
if desired, convert dBm to mW using
d&m
10
mW = 10
The dBm difference between an R, MAG and a B, MAG measurement may not be identical to the B/R, MAG
measured value. The 8505A measures ratio values {A/R, B/R) with greater accuracy than absolute power.
25
LIVEN I'l |
Using the 8503A S-Parameter Test Set with the 8505A you ee |
can measure both forward and reverse transmission and reflec- 8505A
tion characteristics without disconnecting the test device. This
illustration shows a typical 8505A/8503A installation. Use the
19 cm Type N cables supplied with the 8503A to connect RF, R,
A, and B on the 8505A and 8503A front panels.
Test Set Inter-conr.
Be sure to connect the supplied test set interconnection cable
between the 8505A TEST SET INTER-CONN connector on the
rear of the signal processor and the SIGNAL PROCESSOR is e 60
INTER-CONNECT connector on the rear of the 8503 A test set. PORT 7
RF Output Forward RF Output Reverse
The 8503A front panel FORWARD/REVERSE control switches the incident RF to Port 1 for FORWARD or Port
2 for reverse. These illustrations show the functions of the 8505A R, A, and B connections in FORWARD and
REVERSE.
A KR
Reference Reference
4
A В А В
Refiected Transmitted Transmitted Reflected
|
& di & d8 6 dB
Coupling Counting Coupting
—6 db : Ч ~G dB © —6 de TE |
Port 1 © Port 2 Port 1°
A Äh = =
Bridge Bias Bridge Bias Bridge Bias Bridge Bias
1 2 1 2
Forward. incident wave at Port +. Reverse. Incident wave at Port 2.
With these connections, the forward (input} and reverse (output) parameters as follows:
FORWARD
S,, = B/R = Forward Transmission Coefficient
541 = A/R = Input Reflection Coefficient
REVERSE
517 = A/R = Reverse Transmission Coefficient
Sn = B/R = Output Reflection Coefficient
Thus, the forward calibrations and measurements are made in exactly the same way as described in the
previous Transmission and Reflection Measurements sections. For reverse measurements the 8505 A and B in-
puts exchange transmission and reflection functions.
Connecting the 8503 A test set rear panel interconection cable to the 8505A signal processor enables a second
set of Reference Offset, Stored Reference Offset, Electrical Length Offset, and Stored Electrical Length Offset
registers, allowing independent storage of forward and reverse magnitude, phase, delay, and electrical length
calibrations.
26
S-PARAMETER MEASUREMENTS
Connections to the test device should be made using the 11857A Test Port Extension Cables or with the
11608A Transistor Fixture. As shown in the following illustrations, you may connect the test device directly to
the 8503A Port 1 or Port 2. Using two cables balances the electrical length of the test set up. Connecting the
device directly to the 8503 A port may reduce reflection errors at one port by reducing cable and adapter reflec-
tions. Whatever configuration is used, all cables, adapters, and fixtures, required to make the measurement
should also be used during calibration.
Two Cable System
TT SUE Eine ie X
E UNA NN E
ae CUE UN COS
NS E A CEE NN E SC
i
i
Connect together :
for transmission | ЧЕ Connect Forward Nom me va] BEE
calibration 7 \ Short 7 f
Port 1 Port 2 Connect together Port 2
Connect Forward Connect Reverse for transmission Connect Heverse
Short Short catibration Short
Transistor Bias
BRIDGE BIAS 1 and 2 on the 8503A rear panel provide connections for +30 Vdc, +200 mA bias when measur-
ing transistors. Use a dual de power supply, such as the HP 6205B, that is designed for use with bias tees optimiz-
ed for RF applications. (The HP 8717B Transistor Bias Supply is not compatible with the 8503A; it is designed
for bias tees optimized for microwave frequencies and may cause the test device to oscillate).
For common emitter configurations, bias is established by setting V, to the desired voltage then monitoring I,
as Vy, in combination with resistor R, establishes the base current.
AT
Wy
For common base configurations, bias is established by setting Vy, to the desired voltage then monitoring I, as
Voi in combination with Ry establishes emitter current.
RI
AN
“ cb
NI
27
S-PARAMETER MEASUREMENTS
When testing most two port test devices it will probably be most convenient to perform complete forward and
reverse transmission and reflection calibrations at one time. This sequence lists the steps for complete forward
and reverse transmission and reflection calibration for all measurements.
SETUP
Set signal levels.
Set frequency sweep.
Set CRT display; polar beam center.
MARKERS: 1, position measurement marker so FREQ
COUNTER MHz reads desired calibration frequency.
FORWARD TRANSMISSION: S,,, Electrical Length,
and Group Delay MKR. ZR moves marker to outer circle.
Select 8503 FORWARD
Connect through.
CHANNEL 1:
EB/R, POLAR MAG, POLAR FULL 1,
MKR, ZRO (hold until display zero).
ELECTRICAL LENGTH:
B, MODE as required,
CLR if REL lighted,
LENGTH and VERNIER B for smallest cluster,
ZRO.
CHANNEL 1:
POLAR PHASE,
ZRO (hoid until display zero), №
DLY,
ZRO (hold until display zero).
INPUT REFLECTION: 5, MKR, ZRO moves marker to zero degrees
Connect forward short. reference line.
CHANNEL 1:
A/R. POLAR MAG,
ZRO (hold until display zero),
ELECTRICAL LENGTH:
A,
CLR if REL lighted
LENGTH and VERNIER A for smallest cluster,
7RO. MKR, ZAC moves marker to reference line.
CHANNEL 1
POLAR PHASE,
СВО {hold until display zero),
REF,
REF OFFSET so display reads + 180 degrees, »
e
LENGTH to shorten trace.
ZRO,
MKR.
REVERSE TRANSMISSION: S,, REF OFFSET and EF oho moves marker to
Ise above FORWARD TRANSMISSION sequence Press Twice
except select 8503 REVERSE, change CHANNEL 1 \
B/R to A/R, and change ELECTRICAL LENGTH B to A.
QUTPUT REFLECTION: 5,
Fat
Use above INPUT REFLECTION sequence except \
connect short on output port, change CHANNEL 1 Press Twice
A/R to B/R, and change ELECTRICAL LENGTH
Ato B.
28
S-PARAMETER MEASUREMENTS
The measured value for any of the S-Parameters can be read directly from the polar display graticule. The
magnitude ratio, t for transmission or р Рог reflection, is read from the concentric circles and the angle, 4,
read from the radial lines. {Also see page 11},
Magnitude and phase values can also be read using the measurement marker as follows:
Position measurement marker to desired point on trace.
Select A/R or B/R.
Select POLAR MAG.
Read magnitude ratio (MKR + REF).
Calculate linear magnitude coefficient using:
Measured Value
20
rorp = 10° where D =
Select POLAR PHASE
Read phase angle, £ ¢, (MKR + REF).
The S-Parameter displayed is determined by combination of the 8503 S-PARAMETER SELECT switch and
8505 CHANNEL 1 or CHANNEL 2 INPUT switch position.
8503A
S-PARAMETER S-PARAMETER 8505A MEASUREMENT
SELECT INPUT
Sa FORWARD A/R INPUT REFLECTION
Sa FORWARD B/R FORWARD TRANSMISSION
5, REVERSE A/R REVERSE TRANSMISSION
gs, REVERSE B/R OUTPUT REFLECTION
For a device with greater than unity gain, the transmission SCALE/DIV
coefficient will exceed 1 and REF OFFSET must be added to SE REE
place the full trace within the outer circle. Adding 20 dB of REF POLAR FULL: 1 5 2 10 05/02 A eee 9
OFFSET changes the polar full values by a factor of 10 as 905 401 8 201% +20
shown.
Electrical Length, Deviation from Linear Phase, Group Delay
These measurements can be made in the forward or reverse direction using the measurement sequences
described in the Transmission Measurements section,
Return loss can be measured using FORWARD, A/R or REVERSE, B/R in either MAG or POLAR MAG mode.
Refer to the Return Loss measurement sequence in the Reflection Measurements section.
Impedance — Using Smith Chart
Impedance can be read directly from the polar display of reflection coefficient {S,, or S..} by installing a
Smith Chart overlay. Smith chart overlays are supplied with the 8505A in four versions: 3.16, 1.0, 0.5, 0.2. and
0.1 full scale linear coefficient value of the outer circle. For the 3.16 full scale version use REF OFFSET to set the
REF value to +10 dB in POLAR MAG and select POLAR FULL 1. For the others, set the REF value to zero and
select the POLAR FULL value corresponding to the full scale value of the Smith Chart.
29
The 8501A provides independent processing and storage tor both 8505A measurement channels. It serves as
display memory for the 8505A by digitizing and storing measurement data at the 8505A sweep rate then output-
ting the processed trace to the CRT at a fixed display rate. Computational capabilities permit real time averag-
ing and normalization, and the magnifier can increase display resolution. Also, key 8505A Channel 1 and 2
measurement parameters are displayed as labels on the CRT.
MER LS
a
With 8501 A STORAGE ON the 8501 À controls all information presented on the 8505A CRT display. The
MKR and REF values on the 8505A measured value displays are not affected by 8501 À processing. All 8505A
setup, calibration, and measurement sequences described in this note can be accomplished with STORAGE ON
but the labeling interface must be connected to display the reference line or beam center. Selecting 8501A
STORAGE OFF bypasses the 8501 A and returns the 8505A CRT to conventional analog operation.
To familiarize vourself with operation of the 8501 A make these control settings then proceed with the follow-
ing paragraphs:
STORAGE OFF, LABELS OFF, MAGNIFIER X1,
Channel 1 and Channel 2 INPUT OFF, MEMORY VIEW QUT, AVERAGING OFF.
Digital Storage
When the device response characteristic requires a siow sweep to avoid distortion of the measurement, select
STORAGE ON,
Channel 1 and/or Channel 2 INPUT ON.
Cartesian fraces are digitized at 500 frequency points on the X axis and 500 points on the Y axis, with +50%
overrange on the Y axis available to digitize an off-scale trace. Similarly, polar traces are digitized at 250 fre-
quency points with + 50% overrange for both the X and Y axis. Changing the reference line or beam center posi-
tion away from the middle of the CRT moves off-scale points onto the display.
INPUT OFF blanks the Channel 1 or Channel 2 trace. STORAGE HOLD freezes the CRT display for
photography or further analysis and memory is not updated with new data on subsequent sweeps. ERASE com-
pletely clears 8501 A memory of all stored information.
Labels
Select LABELS ON. Sweep mode and frequencies appear at the bottom of the CRT and measurement mode
selections, including the MKR value, appear at the top of the CRT. 8505A Channel 1 and/or Channel 2 MODE
switches must be set to other than OFF for the labels to appear.
30
8501A STORAGE—NORMALIZER
Averaging
Both accuracy and resolution are improved when averaging
is used to remove random noise variations from measurements.
To use averaging, select
ERASE (momentary),
Channel 1 and/or Channel 2 AVERAGING ON,
AVERAGING FACTOR as required.
8501 A averaging acts as a “digital” video filter, performing
an exponential running average on the data at each frequency
point. The current trace has the weight 1-1/n and the new trace
has the weight 1/n where n is the selected AVERAGING FAC-
TOR. Select an averaging factor appropriate for the sweep rate
and degree of signal-to-noise improvement desired, noting that
2n sweeps are required ta converge to 86% of the final value
and 4n sweeps are required to reach 98%. Signal-to-noise im-
provement increases with Vn.
These CRT photos illustrate the improvement in group delay After Averaging
measurement accuracy obtained by averaging.
Magnification
High resolution displays at up to 0.01 dB, 0.1 degree, and 0.1
nanosecond per division are accomplished using the
MAGNIFIER switch to expand the 8505A SCALE/DIV selection.
For example, with 0.1 dB/division set at the 8505A and
MAGNIFIER X10 selected, the CRT display resolution is 0.01
dB/division. The data stored in memory is amplified prior to
display and the MAGNIFIER expands the trace about the
reference line or beam center position. Frequency response of a
cable using a 500 MHz sweep width and 0.01 db/division is
shown in this display. Digitizer resolution produces the step ef-
fect; each step represents a 0.002 dB change.
Passband Ripple at C.01dB/ division using x10
magnification,
Normalization is the process of storing a reference trace in memory and then automatically subtracting the
reference trace from the incoming trace and displaying the difference. Typical applications are to remove fre-
quency response characteristics of the test setup from the measurement or to make a comparison measurement
in which the test device is matched to a standard. Normalization is independent for Channel 1 and Channel 2
and is ordinarily used only for cartesian displays. To normalize:
Connect standard (open, short, through, or standard device),
8505A SCALE/DIV same as for measurement,
MEMORY STORE (momentary),
INPUT-—MEM,
Connect test device.
When MEMORY STORE is pressed, the displayed trace is transferred to reference memory. Selecting INPUT-
MEM displays the difference between the reference trace and the current trace, resulting in a flat trace at the
reference line if the reference trace and the current trace are identical.
31
To 8750A or 8501A 2kQ, + 1.25V, 200 mA current sink,
Normalizer 0.25 V/display division closed during sweep
Processor
HP-IB Connection
(Signal Processor 2kQ, 0-16 V, BEAM INTENSITY
Address = 719] 0-10 V, 2kQ, 6 dB/V 0.25 V/display division +10V, — Bright
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HP-13 Connection +10, 22 \ р-р, Test Set
(Source/Converter 2 dB/V 21изес
Address = 716) ÿ
LINE VOLTAGE | POWER MODULE FUSE
CEA e %
To 8501A Normalizer Cable 08505-60021 em SELECTION [Upper Lower
Labeling Interconnect between FREQUENCY 90 to 105 Vac 100V +. SAT 2.0AT
(Option 007) CONTROL INTER-CONN 198 о 128 Мас 120V T5AT 20AT
and SIGNAL PROCESSOR 0231 Vac 220V O.8AT 1 0AT
INTER-CONN is required. 21 G to 252 Vac 240V O.BAT 1.0AT
B505A Rear Panei Connections
32
CRT DISPLAY ~ The response of both measurement channels can be displayed simultaneously with magnitude
and phase response displaved in either cartesian or polar format.
BEAM CONTROLS — Independent cartesian reference line position controls for each channel, beam center for
both channels, and standard controls for beam and scale,
IF apd VIDEO BANDWIDTH - Select either 10 kHz or 1 kHz IF bandwidth, and 30 Hz post detection video filter
to smooth trace. °
SWEEPER OUTPUT — Sweeper output at RF connector is sum of step attenuator and VERNIER settings.
REFERENCE AND TEST INPUTS - Three identical inputs for absolute or ratio measurements, Each input has a
measurement range from — 10 dBm to — 110 dBm. Slide switch selects maximum input level applied at R, À,
and B inputs for linear operation. OVERLOAD indicators above inputs light when level exceeded,
ERECTUENCTY SCAN CONTROLS AND DISPLAYS — RANGE MHz selects frequency range. MODE selects log -
and linear scans of full range or linear expanded scans selected by WIDTH. With MODE in LOG FULL or LIN
FULL, WIDTH selections display down-pointing markers to identify end points of stored frequency displayed by
the FREQUENCY MHz displays and set by the FREQUENCY controls. Moving MODE to LIN EXPAND selects the
frequency stored for the WIDTH selection.
MEASUREMENT MARKERS ~ The rotary MARKERS switch selects measurement marker 1 through 5. The ad-
jacent numbered vernier controls marker position on trace. The FREQ COUNTER MHz display is blank when
the measurement is not accurate. At positions 2 thorough 5, deselected markers point down, the selected marker
points up.
FREQUENCY COUNTER — Displays frequency of measurement marker selected by MARKERS. Resolution is
controlled by RANGE MHz and SCAN TIME SEC. OVERFLOW indicates one or more most significant digits are
shifted off left of display. Select fast scan time to inspect most significant digits, and slower scan time to inspect
least significant digits. |
ELECTRICAL LENGTH — Display shows equivalent electrical length or linear insertion phase added to
reference channel to equalize electrical length in reference and A and B test signal paths depending upon IN-
PUT and MODE selections. LENGTH buttons increment the displaved value. CLR {momentary} zeros display:
CLR {hold until REL out] clears stored calibration; ZRO stores displaved value as calibration and zeros display.
CHANNEL 1 and CHANNEL 2 — Two identical, independent measurement channels. INPUT and MODE select
measurement trace displayed on CRT. LED displays show the reference line value (REF button pressed), or
measurement marker displacement from reference line (MKR button pressed}. Measured value at marker is sum
of REF and MKR values. REF OFFSET buttons increment the reference line value stored in separate magnitude,
phase, and delay reference offset registers for each channel. CLR {momentary} resets the reference line value to
zero; CLR {held until REL out) clears stored reference offset calibration. ZRO stores the calibration reference
otfset for selected measurement.
33
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