HP 8082a Service manual

CERTIFICATION
The Hewlett-Packard Company certifies that this instrument was thoroughly
tested and inspected and found to meet its published specifications when
shipped from the factory. The Hewlett-Packard Company further certifies
that its calibration measurements are traceable to the US National Bureau of
Standards to theextentallowed by the Bureau’scalibration facilities or to the
calibration facilities of other International Standards Organization Members.
WARRANTY AND ASSISTANCE
XII Hewlett-Packard products are warranted against defects in materials and
workmanship. This warranty applies for one year from the date of delivery,
or, in the case of certain major components listed in the operating manual,
for the specified period. We will repair or replace products which prove to be
defective during the warranty period. No other warranty is expressed or
implied. We are not liable for consequential damages.
For any assistance contact your nearest Hewlett-Packard Sales and Service
Office. Addresses are provided at the back of this manual.
PREFACE
Qne copy of this manual is supplied with each instrument. Additional copies
may be purchased from the locai Hewlett-Packard Sales and Service Office.
Specify the instrument model number and serial number. A microfiche
version of this manual is availabie under part number 08082-90502
Reference should be made to the manual change sheeis supplied with the
manual for errata and technical changes, and Po Section 7 (Backdating/
Updating) ~
Technica! changes are indicated by the prefix (the first five characters) of the
serial number which appears on the rear panel of the instrument; the serial
number prefix of the instrument to which this manual applies directly is:

COMTENTS
Section 1General information
l-1 introduction ................................................. l-l
f-7 EClOlitput .................................................
l-4
Section 2Installation
2-7
2-1
2-2
2-4
2-6
2-8
2-9
2-12
2-15
2-17
2-19
2-26
2-22
General ..................................................... 2-l
initial Inspection
......................................... 2-l
Accessories
........................................... 2-1
PowerCords ........................................... 2-l
installation
................................................... 2-l
PowerCord ........................................... 2-1
Power Source Requirements
................................. 2-2
Temperature Requirements
................................. 2-2
Rack Mounting
............................................... 2-2
Claims and Repackaging
......................................... 2-3
Claims for Damage
....................................... 2-3
Repackaging for Shipment and Storage ......................... 2-3
Section 3Operating Instructions
3-1 General ..................................................... 3-l
3-4 Externat input Characteristics
..................................... 3-l
3-8
Square Wave Operation.
.......................................... 3-2
3-10 Output Amplitude Controls
....................................... 3-2
3-15 incompatible Control Settings
..................................... 3-2
3-17
NormOperatingMode
........................................... 3-2
3-20
EXTwidthOperatingMode
....................................... 3-3
3-22 Gate Operating Mode
........................................... 3-4
3-24 EXT Trig. Operating Mode
....................................... 3-4
3-26 Apptications Notes
............................................. 3-5
Section 4 Theory of Operation
4-l
4-8
4-21
4-28
4-36
4-38
4-44
44%
4-4%
4-50
introduction
................................................. 4-l
Repetition Rate Generator
.......................................
4-1
Delay and width Generators
....................................... 4-3
Slope Generator
............................................... 4-5
Buffer Amplifier
...............................................
4-6
Output Amplifier and Vernier Attenuators
.............................
4-6
DC offset for Positive Pulse Outputs
................................. 4-7
Step Attenuator
............................................... 4-7
~xter~a]DC~f~~
............................................. 4-7
Power Supplies
...............................................
4-7

List of Contents
CXXUTEMTS
Section 5Maintenance
5-l
5-4
5-4
5-7
5-9
5-12
5-15
5-21
5-24
5-28
5-32
5-39
5-41
5-45
5-46
5-46
General .............................. .5-l
Removal of Covers ...........................
5--f
Removal of Assemblies ..........................
5-l
General
..........................
.5-l
Power Supply Board - Assembly 2 ................
.5--l
Repetition Rate Generator Board - Assembly 3 ............
5-l
Output Amplifier Board - Assembly 4 ...............
5-l
Buffer Amplifier Board - Assembly 8 ..............
.5- 1
Output Ampiifier Board (A41 - Hybrid Circuit Renewal ........ 5-l
OffsetBoard-Assembly5 ................... .5-2
Mother Board - Assembly 1
....................5-2
Performance Checks ......................... .5-2
Internal Checks and Adjustments ............................ 5-17
Troubleshooting using the 15265 A Test Box
..................... 5-17
Safety Check
......................................
5-17
Tmubleshootiq Tips .................................. 6-l
7
Section 6Diagrams and Replaceable Parts
6-1
6-3
6-4
h?troduction
............................
.6-l
Ordering information ........................
.6--l
General
..........................
.6-d
Sction 7
7-l
7-3
7-5
7-7
Backdating
Serial Numbers 1419G96145 And Below
.......................... 7-l
Serial Numbers 14fOG99270 And Below ..........................
7-l
9erial Numbers t419G66271 to 1410669390 ......................
7-1
Serial Numbers 1416G66391 And Above ..........................
7-1
Page

Figure
2-a
2-2
2-3
2-4
2-5
3-1
3-2
3-3
3-5
3-6
3-7
3-8
3-9
3-10
3-11
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
5-l
5-2
6-l
Service Sheets
1
Repetition Rate Generator - Board A3 ............................... 6-17
2a
Delay and Width Generators - Part of Board A4 ......................... 6-21
Zb Slopa Generator
- Part of Board A4 and Buffer Amplifier - Soard A8 ......... 6-23
2c Output Amplifier
-Partof Board A4. ................................ 625
3a Slope Generator Current and Voltage Source
- Part of Board A5
............... 6-27
3b DC Offset and Amplitude Vernier
- Part of Board A5 ................... 6-29
4Step Attenuator
- Board A9 .....................................
6-31
5
Power Supplies - Board A2 ....................................... 6-33
Title
~.
8[182A and Supplied Accessories
................................... 2-9
Available Accessories
........................................... 2-6
Power Cords ................................................. 2-2
Switch Settings for the Various Nominal Powerline Voltages
................. 2-2
Removing Plastic Trim
........................................... 2-2
Front Panel Controls and Connectors ..............................
3-Q
Effect of External lnput Controls ................................... 3-1
Positioning of Controls
......................................... 3-2
Pulse Output in NORM Mode ..................................... 3-3
Pulse Dutput in External Width Mode ............................... 3-3
PulseGutputinGateMode ....................................... 3-4
Pulse Output in External Trigger Mode
............................... 3-4
Stepped pulse with high-2 output
................................... 3-5
Flip-Ffop Tzsr Circuit ........................................... 3-6
FlipF!op Test Waveforms ....................................... 3-6
NoisePulses ................................................. 3-7
6082A Pulse Generator - Block Diagram ............................. 4-Q
Repetition Rate Generator - Block Diagram ........................... 4-1
Rate Generator ............................................... 4-2
Transition Detector Pulse Output ................................... 4-3
Delay Generator - Block Diagram
................................... 4-4
Slope Generator Diagram and Waveforms .............................. 4-5
Attenuator Element ........................................... 4-6
Input z&age and Attenuator ....................................... 4-7
Attenuator and Gain Control ..................................... 4-8
Connections between Test Box 15265A and 8Q82A
....................... 5-12
location of adjustment controls ................................... 5-25
Mainframe Parts Identification
..................................... 6-2

List of Table
TABlS
TabJe Title
l-1
5-1
5-2
5-3
5-5
5-7
5-9
5-10
5-11
5-l 2
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
6-l
6-2
6-3
6-4
Specifications
................................................
Test Equipment z . ..’ Accessories for Performance Checks
...................
Performance Check - Repetition Rate
...............................
Performance Check - Delay (Slow) .................................
Performance Check - Width (Slow)
.................................
Performance Check - Jitter .....................................
Performance Check - Width (Fas;j
.................................
Performance Check - Delay (Fast) .................................
Performance Check -SquareWaveDutyCycle
.........................
Performance Check - External Functions .............................
Performance Check - Transition Time
...............................
Performance Check - Preshoot, Overshoot and Ringing
....................
Performance Check - Amplitude ...................................
Performance Check - Check Record
.................................
Summary of adjustable and factoryselected components
...................
Test Equipment and Accessories for Internal Checks and Adjustments
.............
TestandAdjustmentsPerformedbyTestBox 15265A
.....................
Power Supply .................................................
Rep. Rate ...................................................
Delay and Width (Verniers CW)
.....................................
Amplitude, Risetime, Overshoot (Ins - 511s Transition Time)
.................
Amplitude, Risetime, Overshoot (Slower Transition Times)
.................
Pulse Shape and Transition Times
...................................
Positive Pulse Baseline ...........................................
Width .....................................................
Gate ......................................................
Double Pulse .................................................
Safety Check .................................................
Component Designators ..........................................
Manufacturer% Code Numbers end Abbreviations for Parts Lists.
..............
h-ts List ...................................................
Schematic Diagram Notes .........................................
l-2
5-3
5-4
5-4
5-5
5-5
5-6
E-7
5-7
5-8
5-9
5-9
5-19
5-l 1
5-18
5-19
5-29
5-23
5-23
5-24
5-25
5-26
5-26
5-27
5-27
5-27
5-27
5-28
6-l
6-l
6-5
6-13

SAFETY CQMSIDERATlOMS
GENERAL -This is a Safety Class I instrument
(provided with terminal for protective earthing)
and has been manufactured and tested according to
international safety standards.
OPERATION - BEFORE APPLYING POWER
comply with the instalfation section. Additionally,
the following shall be observed:
Any interruption of the protective (ground-
ding) conductor (inside or outside the
instrument) or disconnecting the protective
earth terminal is likely to make this instru-
ment dangerous. tntentionaf interruption is
prohibited.
Whenever it is likely that the protection has
been impaired, the instrument must be made
inoperative and be secxed against any un-
intended operation.
Make sure that only fuses with the required
rated currznt and of the specified type
{normal blow, time deiay, etc.) are used for
replacement. The use of repaired fuses and the
short-circuiting of fuseholders must be
avoided.
Adjustments described in the manual are per-
formed with power supplied to the instrument
while protective covers are remowed. Energy
available at many points may, if contacted,
result in personal injury.
Any adjustment, maintenance, and repair of
the opened instrument under voltage should be
avoided as much as possible, and when inevitable,
should be carried out only by a skilled person
*who is aware of the hazard involved.
SAFETY SYMBl)LS
The apparatus will be marked with this
symbol when it is necessary for the user to
refer to the instruction manual in order to
protect the apparatus against damage.
Indicates dangerous voltages.
Earth terminal {sometimes used in man-
ualto indicated circuit common con-
nected to grounded chassis).
WARNING
The WARNING sign denotes a
hazard. It calls attention to a
procedure, practice or the like, which,
if not correctly performed or adhered
to, could result in injury or loss of tife.
Do not proceed beyond a WARNING
sign until the indicated conditions
are fully understood and met.
CAUTION The CAUTiON sign denotes a hazard.
It calls atkct:!ttion to an operating
procedure, practice, or the like, which,
if not correctly performed or adhered
to, could result in damage to or destruc-
tion of part or all of the equipment.
Do not proceed beyond a CAUTION
sign until the indicated conditions are
fully understood and met.
Capacitors inside the instrument may still be
charged even if the instrument has been :liscon-
netted from its source of supply.

GENERAL INFORMATION
t-1
INTRODUCTliON
1-2 The 8082A is a 250 MHz dual channel pulse
source with variable leading and trailing edge transition
times as fast as Ins. It also has variable pulse frequency,
delay, width, offset and amplitude. The normal/compie-
ment reiationship and the polarity of either output can
be reversed. Single pulse, double pulse and square wave
operatiol) are available. There are also four trigger
modes-
1-3 Norma! Mode. in this mode the 8082A oper-
ates as a self-contained pulse source with f&i control
of the p&e parameters from the front panel controls.
1-4 Ext Trig Mode. in this mode the pulse and
trigger output frequencies are determined by the fre-
quency of an externaity applied signal. The other puke
parameters are varied from the front panei controis.
l-5
Gate Mode. In this mode a gating signal
enables the pulse and trigger outputs.
1-6
External Width Mode. in this mode the pulse
frequency and width are determined by the frequency
and width of an externally applied signal. The delay be
tween input and output is fixed. The trigger output
is the shaped trigger input signal.
1-7
ECL OUTPUT
1-8
The 8082A has an ECL position on each of
its amplitude range switches. When e;ther or both of
the switches are se? to this position, both 8082A outputs
automatically deliver a fixed voltage swing of -0.9V to
-7.7V typical (into an open circuit) for driving ECL
logic.

Table l-7 Specifications
These specifications apply when:
PULSE CHARACTERlSTlCS
Bource and Doad impedance 5052)
Transition Times:< Ins to 0.5ms in
6 ranges. First range from < Ins to
5ns controls ieadingand trailing edges
simuitaneoufsy. For all other ranges
transition timesvariable independent-
ly up to 7:lO.
Difference between risetime and fall-
time is less than 25% of the faster
transition time of the two.
Overshoot and Ringing: & + 5% of
pulse ampiitude may increase to
3~ 10% with amplitude vernier CCW.
Preshoot: < + 5% of pulse amplitude.
Linearity: Linearity aberration for
both slopes < 5% FOF transition times
> 5ns.
Output: Maximum amplitude is 5V
from 5051 into 5OQ. Maximum out-
put voltage is + 5V (amplitude t off-
set).
Offset > Z!T 2V, into 5OG!
Baseline: OV t 150mV with offset
switched off and amplitude range
set to maximum. Other amplitude
ranges reduce baselineproportionately
DCSource Impedance: 5052 T 5% .
Reflection Coefficient Reffection 1s
2% typical for steps with 1 ns rise time
applied to output connector on all
amplitude ranges except 5V range.
On the 5V range, the reflection may
be 15%.
OutPut protection: Cannot be da-
maged by open o; short circuits or
application of ext < It 6 volts or
+ 2QOmA independent of control set -
tings.
Attenuator: Two separate three step-
attenuators reduce the outputs to 4 V.
Vernier is common for both outputs
and reduces the output to 0.4V
minimum. A further position pro-
vldesECL-compatibleoutputsi-O,9V
1) both outputs are
terminated by a 50-Q
load,
TIMING
Repetition Rate: > 250 hri!-!z to
< 1 kHz in 6 ranges.
Period Jitter: < 0.7 % + 50~s
Delay: < 2ns to > 0.5ms in 6 ranges
plus typ. 18ns fxd. with respect to
trigger output.
Delay Jitter:< 0.1% 9 50~s
Double Pulse: Up to 125 MHz max.
(simufatesEXIMHz).Min pulsespacing
2 4ns.
Delay Duty Cycle: > 50%
Pulse Width: < &s to > 0.5ms in 6
ranges.
Width Jitter: < 0.1% + 50~s
Width Duty Cycte: > 50%
Square Wave: A further position of
the Pulse Width switch provides
Square Wave output. (Delay and
double pulse are disabled, max. Rep.
Rate 250 MHz). Duty cycle is 50%
+ 10% up to 100 MHz, 50% + 15%
for > 100 MHz.
Trigger Output: Negative going
Square Wave (50Y3 duty cycle typ.)
> 500mV from 50R Into 5Os1.
Internal 5Ofi ioad can be switched
off by slide-switch on PC-board.
Amplitude increases to 2 1V into
5Cfz up to 200 MHz.
Trigger Output Protection: Cannot
be damaged by short circuit or appli-
cation of externai f 200mA.
EXTERNALLY CONTROLLED
OPERATION
External input
1 npus Impedance: 5Ofi + 10%. DC
coupled.
Maximum input: f 6V
Trigger Level: Adjustable - 1.5V to
2) the internal 5042
source impedance is
selected.
Slope Control: Positive, negative or
manual selectable. In the MAN-posit-
ion all ext. functions can be con-
trolled by push button. Button
pushed in simulates an “on-signal”.
Sensitivity: Sine-wave > 2OOmVpp,
pulses > 2QOmV.
Repetition Rate: 0 to > 250 MHz.
Ext.-Controlled Modes
Ext.frigger: There are approximateiy
7ns delay between the external rnput
and the trigger output. Rep.-Rate is
ext. controlled (is triggered by exter-
nal signal). Trigger output provides
the pulse-shaped input signal. Square
wave mode is disabled.
Synchronous Gating: Gating signal
turns rep. rate generator on. Last
pulse is of normal width even if gate
ends during the pulse.
External Width: Output pulse width
determined by width of drive input.
Rep. Rate and Delay are disabled.
T J igger output provides shaped input
siqnal.
OPTIONS
Option 907 Front Handle Kit
Option 908 Rack Flange Kit
Option 909 Rack Fiange plus Front
Handie Kit
Option 910
Additional Instrument
Manual
GENERAL
Power Requirements: 7 OOV I 12QV,
22OV * 24ov t+5%, - 10%) 48 - 440
Hz. Powt:r consumption 85VA max .
Weight: Nei 7.9 kg 417.44 lhs),
shipping 8.9 kg 119.63 Ibsf.
Dimensions 426mm wide, f45m:m
hi& li8nmm drwn i IG Y/A ;nc v

Figure 2-I. 8082A and Supplied Accessories
Front handle
Order Option 907
Figure 2-2. Avaiiable Accessaries
Rack flange with front handle
Order Option 909 Rack flange
Order Option 908