HP 8112A Owner's manual

Operating, Programming and
Servicing Manual
HP 8112A 50 MHz Programmable
Pulse Generator
SERIAL NUMBERS
This manual applies directly to instruments with serial number
3205G010006 and below.
If your instrument has a higher serial number, refer to Appendix
C Updating which contains manual changes for later instruments.
Be sure to examine this supplement for changes which apply to your
instrument, and record these changes in the manual.
HP Part No. 08 112-90004
Microfiche Part No. 08112-95004
Printed in Federal Republic of Germany January 1992
First Edition
E0192

Notice
Subject Matter Notice The information in this document is subject to change without
notice.
Hewlett-Packard makes no warranty of any kind with regard to
this printed material, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose.
Hewlett-Packard shall not be liable for errors contained herein or
for incidental or consequential damages in connection with the
furnishing, performance or use of this material.
Copyright
This document contains proprietary information which is protected
by copyright. All rights are reserved. No part of this document may
be photocopied, reproduced or translated into another language
without the prior consent of Hewlett-Packard GmbH.
@ Copyright 1991 by Hewlett-Packard GmbH
Herrenberger Strasse 130, D-7030 Boeblingen
Federal Republic of Germany

PrintingHistory
New editions are complete revisions of the manual. Update
packages, which are issued between editions, contain additional and
replacement pages to be merged into the manual by the customer.
The date on the title page and back cover of the manual only changes
when a new edition is published. When an edition is reprinted, all
the prior updates to the edition are incorporated. No information is
incorporated into a new edition unless it appears in a prior update.
Edition
1
1
Print Date Manual Part
No.
February 1984 08112-90002 E0284
January 1992 08112-90004 E0192
Safety
This product has been designed and tested according to International
Safety Requirements. To ensure safe operation and to keep the
product safe, the information, cautions and warnings in this manual
must be heeded.
. ..
III

Preface
Introduction
This manual describes the following procedures for the HP 8112A
50MHz Programmable Pulse Generator:
W Installation
n Operation
n Programming
L Performance Test
n Adjustment
n Service
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 Institute of Standards
and Technology, to the extent allowed by the Institute’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, HP 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. The Buyer shall prepay shipping
charges to HP and HP shall pay shipping charges to return the
product to the Buyer. However, the 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, software, or firmware will be
uninterrupted or error free.
Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from
improper or inadequate maintenance by the Buyer, Buyer-supplied
software or interfacing, unauthorized modification or misuse,
operation outside of the environmental specifications for the product,
or improper site preparation or maintenance.
No other warranty is expressed or implied. HP specifically disclaims
the implied warranties of Merchantability and Fitness for a Particular
Purpose.
iv

Exclusive Remedies
The remedies provided herein are the Buyer’s sole and exclusive
remedies. HP shall not be liable for any direct, indirect, special,
incidental, or consequential 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.
V

Contents
Contents-l
1. Introduction
General ....................
Instruments Covered by This Manual .......
Instrument Description .............
HP 8112A Options ...............
Accessories ..................
Recommended Test Equipment ..........
2. Specifications
Introduction ..................
Timing Parameters ...............
Common Specifications ............
Period (PER) ................
Delay (DEL) (after Trigger Out) ........
Double Pulse (DBL) (interval between leading edges)
Pulse Width (WID) .............
Duty Cycle (DTY) ..............
Linear Transitions (between 10% and 90% amplitude)
Output Parameters ...............
High Level (HIL) ...............
Low Level (LOL) ...............
Operating Characteristics ............
Trigger Modes .................
Normal ...................
Trigger ...................
Gate ....................
External Width ...............
External Burst ................
Control Modes .................
Period, Delay, Double pulse and Width Control .
High-level Control ..............
Settling time (within 5% of final value) ....
Output Modes .................
Complement .................
Disable ...................
Limit ....................
Fixed transitions ...............
Cosine transitions ..............
Linear transitions ...............
Inputs and Outputs ...............
External Input ................
Control Input ................
l-l
l-l
l-2
1-2
l-3
l-4
2-l
2-l
2-l
2-2
2-2
2-2
2-2
2-2
2-2
2-3
2-3
2-3
2-3
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-5
2-5
2-5
2-5
2-5
2-5
2-5
2-5
2-5
2-5

Trigger Output . . .
.............
2-5
Main Output . . ..............
2-6
Additional Features . .
.............
2-6
General Characteristics .............
2-7
Environmental . . ..............
2-7
Power supply . . ..............
2-7
Weight . . . . . ..............
2-7
Dimensions . . . ..............
2-7
Recalibration period .............
2-7
3. Installation
Introduction ..................
Safety Considerations ..............
Initial Inspection ................
Power Requirements and Line Voltage Selection . .
Power Cable ..................
HP-IB Connector ................
HP-IB Logic Levels ...............
Operating Environment .............
Temperature .................
Humidity ..................
Instrument Cooling ...............
Claims and Repackaging .............
Storage and Shipment ..............
Return Shipment to HP .............
4. Operating
Introduction ..................
Switching On .................
Error Codes .................
Standard Parameter Set .............
Selecting Trigger Mode .............
Mode Selection ................
Controlling the External Trigger .........
Trigger Slope ................
Trigger Level ................
3-l
3-l
3-l
3-2
3-3
3-5
3-5
3-6
3-6
3-6
3-6
3-6
3-7
3-7
4-l
4-2
4-2
4-4
4-5
4-5
4-6
4-6
4-6
............. 4-6
............. 4-6
Trigger Output ................
4-6
Selecting Control Mode .............
Control Input ................
Mode Selection ................
Period Control (PERC) ...........
Delay Control (DELC) ...........
Width Control (WIDC) ...........
High Level Control (HILC) .........
Setting Transition Modes ............
Fixed ..................
Linear ..................
Gaussian ................
Transition Ranges ..............
4-7
4-7
4-8
4-8
4-8
4-8
4-8
4-10
4-10
4-10
4-10
4-11
Contents-2

Up and Down-ranging, Using the VERNIER keys .
4-11
Up and Down-ranging Using the RANGE key . .
4-12
Setting Parameters ...............
4-13
Selection ..................
4-13
Adjustment .................
4-13
Period/Burst Key ..............
4-13
(PER) ...................
4-13
IBUR) ...................
4-13
Delay/Double Key ..............
4-14
IDELI) ...................
4-14
(DBL) ...................
4-14
Width/Duty Key ...............
4-14
(WIOI A.1.. .............
4-14
m
...................
4-14
Leading and Trailing edge Keys B (TRE)
...
4-14
High and Low level Keys (HIL) m
.......
4-14
SetKey(SET)
................
4-14
Store and Recall Key (m)
..........
4-15
Selecting Output Mode .............
4-16
Limited Output m
............
4-16
Complement Output (s)
..........
4-16
Disabled Output (DISABLE)
............
4-16
Rear Panel ..................
4-18
HP-IB Connector ...............
4-18
x-out ...................
4-18
Marker Output ................
4-18
Hold In ...................
4-18
Fuse ....................
4-18
5. Operating Examples
Introduction ..................
Triggering Examples ..............
Normal Mode ................
Trig Mode ..................
Gate Mode .................
External Width Mode .............
External Burst Mode .............
Applications ..................
Analog Applications .............
Fixed transition mode ............
Linear transition mode ...........
Cosine shaped transition modes (Gaussian) . .
Digital Applications .............
Fixed transition mode ............
Linear variable transition mode .......
Cosine shaped transition mode ........
5-l
5-l
5-l
5-2
5-3
5-4
5-5
5-6
a- ‘6
5-6
5-6
5-6
5-7
5-7
5-7
5-7
Contents-3

6. Programming
General ....................
Setting the HP-IB Address ..........
Local, Remote and Local Lockout .......
Abbreviations used in this Document ......
Terminators .................
Programming ................
Example: .................
Example: .................
Multiple Commands .............
Examples: .................
Selecting Trigger Modes .............
Standard Trigger Modes ............
Trigger Control ...............
Example ..................
Selecting Control Modes .............
Example ..................
Selecting Output Waveform Mode ........
Example ..................
Setting Parameters ...............
Timing parameters ..............
Example ..................
Level parameters ...............
Example ..................
Burst Parameter ...............
Example ..................
Vernier ....................
Example ..................
Range Change .................
Example ..................
Stored Parameters ...............
Example ..................
Excessive Slope Calculation ...........
Example ..................
Reading parameters ...............
Standard ..................
Example ..................
Selecting Output Modes .............
Output Controls ...............
Example ..................
Reading the Current Settings ..........
Example ..................
Timing ....................
Data Transmission Time ...........
Send ...................
Answer ..................
Implementation Time .............
Hardware Settling Time ............
Error, Fault and Status Reporting ........
HP-IB Status Byte ..............
Limit Error (Bit 0) ..............
6-l
6-l
6-2
6-3
6-3
6-4
6-4
6-4
6-4
6-4
6-6
6-6
6-6
6-6
6-6
6-6
6-7
6-7
6-7
6-7
6-7
6-8
6-8
6-8
6-8
6-8
6-8
6-9
6-9
6-9
6-9
6-9
6-9
6-10
6-10
6-10
6-11
6-11
6-11
6-11
6-12
6-12
6-12
6-12
6-12
6-12
6-13
6-13
6-13
6-14
Contents-4

7.
Timing Error (Bit 1) .............
6-15
Syntax Error (Bit 2) .............
6-15
Slope Error (Bit 3) ..............
6-15
Example .................
6-16
Duty Cycle Error (Bit 4) ...........
6-16
Input Error (Bit 5) ..............
6-17
Service Request (Bit 6) ............
6-17
Buffer not Empty (Bit 7) ...........
6-17
HP-IB Universal Commands ...........
6-18
DCL ....................
6-18
SDC ....................
6-18
GET ....................
6-18
Hints for solving Problems that might occur .... 6-19
Reading the Status Byte ........... 6-19
Example: ................. 6-19
Terminators .................
6-20
Possible Problem with SPOLL .........
6-20
Interrogate Timing ..............
6-21
Programming Examples
Introduction ..................
General Examples ..............
Common Task Examples ...........
Testing communication .............
Performing self-test ...............
Using the Buffer Not Empty Flag .........
Common Task Examples ............
Program DEL-WID ..............
Purpose ...................
Comments ..................
Program SPOLL-2
...............
Purpose ...................
Important program lines ...........
Comments ..................
Initialization section ............
Main section ................
INTR-2 ....................
Purpose ...................
Comments ..................
Setup section (lines 110 - 120): ........
Main section ................
Subroutine section .............
.The Service-srq subroutine ........
ERROR-DEMO ................
Purpose ...................
Important program lines and their function ...
Comments ..................
LRN-DEMO .................
Purpose ...................
Comments ..................
Learn String (Delay Mode active) ......
7-l
7-l
7-1
7-2
7-4
7-6
7-8
7-8
7-8
7-8
7-10
7-10
7-10
7-10
7-10
7-10
7-12
7-12
7-12
7-12
7-12
7-12
7-12
7-13
7-13
7-13
7-13
7-16
7-16
7-16
7-16
Contents-5

Learn String (Double Mode active) ......
INTERROG ..................
Purpose ...................
Comments ..................
Screen dump of the results printed when running
the program INTERROG ........
Program listing ..............
8. Testing Performance
Introduction ..................
Test Equipment ...............
Period Performance Test ............
Specifications ................
Equipment .................
Test Setup ..................
Procedure ..................
Delay Performance Test .............
Specifications ................
Equipment .................
Test Setup ..................
Procedure ..................
Double Pulse Performance Test .........
Specifications ................
Equipment .................
Test Setup 1 .................
Test Setup 2 .................
Procedure ..................
Pulse Width Performance Test ..........
Specifications ................
Equipment .................
Test Setup 1 .................
Test Setup 2 .................
Procedure ..................
Constant Duty Cycle Performance Test ......
Specifications ................
Equipment .................
Test Setup ..................
Procedure ..................
Output Levels Performance Test .........
Specifications (values in parenthesis into open circuit)
Equipment .................
Test Setup ..................
Procedure ..................
Transition Time Performance Test ........
Specifications ................
Equipment .................
Test Setup ..................
Procedure ..................
Fast transitions ..............
Slow transitions ..............
Pulse Performance Test .............
7-16
7-18
7-18
7-18
7-18
7-18
8-1
8-2
8-3
8-3
8-3
8-3
8-3
8-4
8-4
8-4
8-5
8-5
8-6
8-6
8-6
8-6
8-7
8-7
8-8
8-8
8-9
8-9
8-9
8-9
8-10
8-10
8-11
8-11
8-11
8-12
8-12
8-12
8-12
8-12
8-14
8-14
8-14
8-14
8-14
8-15
8-15
8-16
Contents-6

Specifications ................
Equipment .................
Test Setup ..................
Procedure ..................
Trigger,Gate,E.Width and E.Burst Verification Test
Characteristics ................
Equipment .................
Test Setup ..................
Procedure ..................
Output Mode Verification Test ..........
Characteristics ................
Test Setup 1 .................
Test Setup 2 .................
Equipment .................
Procedure ..................
Period Control Verification Test .........
Characteristics ................
Equipment .................
Test Setup ..................
Procedure ..................
Delay Control Verification Test ..........
Characteristics ................
Equipment .................
Test Setup ..................
Procedure ..................
Width Control Verification Test .........
Characteristics ................
Equipment .................
Test Setup ..................
Procedure ..................
High-Level Control Verification Test .......
Characteristics ................
Equipment .................
Test Setup ..................
Procedure ..................
Store and Recall Function Test ..........
Characteristics ................
Procedure ..................
HP-IB Verification Test .............
Test Setup ..................
Equipment .................
Procedure ..................
Performance Test Record ............
8-16
8-16
8-16
8-16
8-18
8-18
8-19
8-19
8-19
8-21
8-21
8-21
8-22
8-22
8-22
8-23
8-23
8-23
8-23
8-24
8-24
8-24
8-24
8-25
8-25
8-26
8-26
8-26
8-26
8-27
8-27
8-27
8-27
8-28
8-28
8-29
8-29
8-29
S-30
S-30
S-30
S-30
8-33
Contents-7

9. Adjustment Procedures
Safety Considerations ..............
Introduction ..................
Test Equipment ...............
Test Preparation ...............
Power Supplies .................
Equipment .................
Procedure ..................
Pre Adjustments ................
Equipment .................
Procedure ..................
Minimum Pulse Droop ...........
Normal/Complement ............
Amplitude/Offset ..............
Overshoot & Transition Time Adjustment .....
Equipment .................
Procedure ..................
Timing ....................
Equipment .................
Procedure ..................
Period ..................
Delay (Double Pulse) ............
Width Adjustment ...............
Equipment .................
Procedure ..................
Shaper and Offset Adjustments .........
Equipment .................
Procedure ..................
Fixed amplitude ..............
Linear Amplitude .............
Gauss Amplitude ..............
Offset ...................
HILC ..................
Slope .....................
Equipment .................
Procedure ..................
10. Introduction to Servicing
Safety Considerations ..............
Safety Check .................
General ....................
10.1. Instrument Overview and Troubleshooting Guide
Theory of Operation ..............
Trouble shooting ................
Preparing the HP 8112A for servicing ......
Key Jammed ................
0....................
RAM Test ..................
EOl
....................
Timing Tests ................
9-l
9-1
9-4
9-4
9-4
9-4
9-4
9-5
9-5
9-5
9-5
9-6
9-6
9-7
9-7
9-7
9-10
9-10
9-10
9-10
9-11
9-13
9-13
9-13
9-15
9-15
9-15
9-15
9-16
9-17
9-17
9-18
9-19
9-19
9-19
10-l
10-l
10-3
10.1-l
10.1-3
10.1-3
10.1-5
10.1-5
10.1-5
10.1-5
10.1-5
Contents-8

El1 ....................
10.1-5
El2 ....................
10.1-5
El3 ....................
10.1-5
El4 ....................
10.1-5
Output Amplifier Tests ............
10.1-7
E21. ...................
10.1-7
E22 ....................
10.1-7
Overall Tests, Static .............
10.1-7
E31. ...................
lO.l.-7
E32 ....................
10.1-7
E33 ....................
10.1-7
E34
....................
10.1-7
Overall Tests, Dynamic ............
10.1-7
E35 ....................
10.1-7
E36 ....................
10.1-g
E37 ....................
10.1-g
E38 ....................
10.1-g
E39 ....................
10.1-g
Amplitude Tests ...............
10.1-g
E41. ...................
10.1-g
Shaper Output State Test ...........
10.1.-g
E42 ....................
10.1-g
Burst Tests .................
10.1-g
E51. ...................
10.1-g
E52 ....................
10.1-g
10.2. Servicing the Power Supply
Theory of Operation ..............
Introduction .................
Line Voltage Selector and Transformer .....
Bridge Rectifiers and Regulators ........
Voltage and Current Sensing Circuits ......
+5.1 v supply ...............
+5 v supply ................
-5.4 v supply ...............
Power-down Detection ............
Troubleshooting the Power Supply ........
Removing the fan ..............
Re-fitting the fan ...............
10.2-l
10.2-l
10.2-l
10.2-l
10.2-2
10.2-2
10.2-2
10.2-2
10.2-3
10.2-g
10.2-g
10.2-g
10.3. Servicing the Timing and Slope Generators
Theory of Operation ..............
Introduction .................
Trigger Input ................
Trigger mode ...............
Address Decoder ...............
Mode and Range Decoders ..........
Control Input Circuits ............
Timing IC ..................
Timing Generation .............
RATE Mode ................
10.3-l
10.3-l
10.3-l
10.3-l
10.3-2
10.3-2
10.3-2
10.3-2
10.3-3
10.3-4
Contents-9

TIME Mode ................
10.3-4
outputs ..................
10.3-5
Error Output ..............
10.3-5
Period, Delay and Width Generation ...... 10.3-5
Period Generator .............. 10.3-5
Delay Generator ..............
10.3-6
Width Generator .............. 10.3-6
Slope Generation ...............
10.3-7
Fixed Transition ..............
10.3-7
Linear and Gaussian Transitions .......
10.3-7
Current Sources .............. 10.3-8
Range Switches .............. 10.3-8
Reference Circuit ..............
10.3-8
Error Feedback ................ 10.3-8
Troubleshooting ................ 10.3-14
Address Decoder ............... 10.3- 14
Control Mode Selection ............ 10.3-15
Period Generator ............... 10.3-16
Delay Generator ............... 10.3-18
Width Generator ............... 10.3-19
Slope Generator ............... 10.3-21
Range Decoder ............... 10.3-22
Example ................ 10.3-22
10.4. Servicing the Shaper and Output Amplifier
Theory of Operation ..............
Introduction .................
Bus Latch ..................
Shaper IC ..................
Wave Forming ...............
Output Mode ...............
Shaper Output ...............
Current Mirror ................
Pre-Attenuator ................
Signal Output Amplifier ............
Input ...................
Voltage gain ................
output ..................
Trigger Output Amplifier ...........
Level Check Circuit ..............
Troubleshooting ................
Shaper IC Inputs ...............
Transition Mode and Output Control Signals . .
Shaper IC Amplitude-vernier Control-voltage . .
Shaper IC Reference Current ..........
Shaper IC Current-mirror ...........
Pre-Attenuator and Output Attenuator Control
Signals ..................
Offset-vernier Control-voltage .........
Output Amplifier ...............
10.4-l
10.4-l
10.4-l
10.4-l
10.4-2
10.4-3
10.4-3
10.4-3
10.4-4
10.4-4
10.4-5
10.4-6
10.4-6
10.4-6
10.4-6
10.4-11
10.4-11
10.4-13
10.4-13
10.4-13
10.4-13
10.4-13
10.4-14
10.4-14
Contents-10

10.5. Servicing the Control Board
Theory of Operation ..............
Introduction .................
Timer ....................
Address Decoders ..............
Timing Range Decoder ............
DAC Reference Circuit ............
Digital to Analog Converters ..........
Normal operation ..............
Reciprocal operation ............
Byte offset latches and Offset DAC .......
Byte Latching ...............
Offset DAC ................
Parameter Control ..............
Troubleshooting ................
Timer ....................
Address Decoders ..............
Timing Ranges ................
Period Control ................
Delay Control ................
Width Control ................
Slope Control ................
Amplitude Control ..............
Offset Control ................
Timer ....................
10.6. Servicing the Burst Control Circuit
Theory of Operation ..............
Introduction .................
Burst Number Acceptors ...........
Counter ...................
Blocking Flip-flop ..............
Period Generator Control ..........
Counter reset ...............
Troubleshooting ................
Output Address Decoder ...........
Burst Counter ................
10.7. Servicing the Microprocessor and Front-panel
Theory of Operation ..............
Introduction .................
Read Only Memory (ROM) ..........
Random Access Memory (RAM) ........
RAM Battery Supply .............
HP-IB General Purpose Interface Adapter . . , .
Microprocessor Interface Signals .......
HP-IB Interface Signals ...........
Address Decoding ..............
Sub-decoder 1...............
Sub-decoder 2...............
Control Board Address Decoding ........
10.5-l
10.5-l
10.5- 1
10.5-l
10.5-2
10.5-2
10.5-2
10.5-2
10.5-3
10.5-3
10.5-3
10.5-4
10.5-4
10.5-11
10.5-11
10.5-11
10.5-13
10.5-13
10.5-13
10.5-14
10.5-14
10.5-14
10.5-15
10.5-16
10.6-l
10.6-l
10.6-l
10.6-2
10.6-2
10.6-2
10.6-2
10.6-5
10.6-5
10.6-6
10.7-l
10.7-l
10.7-2
10.7-2
10.7-2
10.7-2
10.7-2
10.7-3
10.7-4
10.7-4
10.7-4
10.7-5
Contents-l 1

Key Scanning ................
10.7-5
Display Driving ...............
10.7-5
Display Driver U22 .............
10.7-5
HP-IB Status Latch U37 ..........
10.7-6
Display Latche U23 .............
10.7-6
Reset Circuits ................
10.7-6
Troubleshooting ................
10.7-15
Free Running Signature Analysis ........
10.7-15
Address Bus .................
10.7-15
ROM ....................
10.7-16
Changing the ROM ..............
10.7-17
Keyboard ..................
10.7-17
A. Replaceable Parts
Introduction ..................
General ...................
Ordering Parts ................
Standard Instrument Parts-lists .........
Master List .................
Main Board .................
Control Board ................
Microprocessor Board .............
Keyboard ..................
Display Board ................
A-l
A-l
A-l
A-6
A-6
A-8
A-26
A-33
A-37
A-40
B. Backdating
Introduction .................. B-l
C. Updating
Introduction .................. C-l
D. Sales and Service Offices
Information ..................
Asia ....................
Canada ...................
Eastern Europe ...............
Northern Europe ...............
South East Europe ..............
Middle East and Central Africa ........
United Kingdom ...............
United States of America ...........
Eastern USA .................
Midwestern USA ...............
Southern USA ................
Western USA ................
Other International Areas ............
D-l
D-l
D-l
D-l
D-l
D-l
D-2
D-2
D-2
D-2
D-2
D-2
D-2
D-3
Index
Contents- 12

Figures
l-l. Serial Number Plate (FRG) ..........
3-l. Line Voltage Selector Switches .........
3-2. Power Cables & Plug Identification .......
3-3. HB-IB Connector ...............
4-l. HP 8112A Front Panel ............
4-2. Trigger Mode Controls ............
4-3. External Trigger Controls ...........
4-4. Control mode controls ............
4-5. Relationship Between Control Input Voltage and
Controlled Parameter ...........
4-6. High Level Control Capabilities ........
4-7. Transition Controls ..............
4-8. LEE and TRE ranges .............
4-9. Ranging examples ..............
4-10. Parameter controls ..............
4-11. Output controls ...............
4-12. Rear panel ..................
5-l. Typical output in Normal mode ........
5-2. Typical signals in Trigger mode ........
5-3. Typical signals in Gate mode .........
5-4. Typical signals in External Width mode .....
5-5. Typical signals in External Burst mode .....
5-6. Capacitance circuit ..............
8-l. Period Performance Test ...........
8-2. Delay Performance Test ............
8-3. Double Pulse Performance Test ........
8-4. Double Pulse Performance Test ........
8-5. Pulse Width Performance Test .........
8-6. Pulse Width Performance Test .........
8-7. Duty Cycle Performance Test .........
8-8. Output Levels Performance Test ........
8-9. Transition Times Performance Test .......
8-10. Pulse Performance Test ............
8-11. Pulse Performance Characteristics .......
8-12. Trigger, Gate,E.WID & E.BUR Verification Test .
8-13. Output Mode Verification Test .........
8-14. Output Mode Verification Test .........
8-15. Period Control Verification Test ........
8-16. Delay Control Verification Test .........
8-17. Correct Delay Control .............
8-18. Width Control Verification Test’ ........
8-19. High-Level Control Verification Test ......
l-l
3-2
3-3
3-5
4-2
4-5
4-6
4-7
4-7
4-9
4-10
4-11
4-12
4-13
4-16
4-18
5-l
5-2
5-3
5-4
5-5
5-6
8-3
8-5
8-6
8-7
8-9
8-9
8-11
8-12
8-14
8-16
8-18
8-19
8-21
8-22
8-23
8-25
8-25
8-26
8-28
Contents-l 3

8-20. Correct High-level Control ...........
8-28
8-21. Correct Delay Control .............
8-29
8-22. HP-IB Verification Test ............
8-30
9-l. Access to the HP 8112A for Adjustments .... 9-4
9-2. Pre adjustments setup ............ 9-5
9-3. Typical Pulse Display ............. 9-8
9-4. Decade Accuracy ...............
9-10
9-5. Double Pulse Adjustment ...........
9-12
9-6. Low Pass Filter ...............
9-16
9-7. Slope test setup ...............
9-19
9-8. Adjustment Points on the Main Board Al ....
9-22
9-9. Adjustment Points on the Control Board A2 ... 9-23
10.1-l. HP 8112A Functional block diagram ......
10.1-l
10.1-2. Custom ICs used in the HP 8112A .......
10.1-2
10.1-3. HP 8112A in its servicing position .......
10.1-3
10.2-l. Power Supply block diagram ..........
10.2-l
10.2-2. Main Board Al - Schematic 1 .........
10.2-5
10.2-3. Main Board Al - Schematic 2 ......... 10.2-7
10.2-4. Detail of wiring to Line Voltage Selector switches . 10.2-g
10.2-5. Power supply components - Underside of main board
Al ................... 10.2-10
10.3-l. Timing IC block diagram ...........
10.3-3
10.3-2. Example of signal generation
.......... 10.3-5
10.3-3. Slope IC block diagram ............ 10.3-7
10.3-4. Main Board Al - Schematic 3 .........
10.3-g
10.3-5. Main Board Al - Schematic 4 .........
10.3-11
10.3-6. Main Board Al - Schematic 5 ......... 10.3-13
10.3-7. Address decoder - Simplified block diagram ... 10.3-14
10.3-8. Period Generator Input pin 7 ......... 10.3-16
10.3-g. Period Generator ramp signal pin 20 ...... 10.3-17
10.3-10. Period Generator output signals
........
10.3-17
10.3-11. Delay Generator I/P O/P waveforms ...... 10.3-18
10.3-12. Delay Generator ramp signal pin 20 ....... 10.3-18
10.3-13. Width Generator Input
............
10.3-19
10.3-14. Width Generator ramp signal ......... 10.3-20
10.3-15. Width Generator output ........... 10.3-20
10.3-16. Slope Generator Input and Output signals .... 10.3-21
10.4-l. Shaper IC Block Diagram ........... 10.4-2
10.4-2. Current Mirror
................
10.4-4
10.4-3. Simplified Output Amplifier circuit .......
10.4-5
10.4-4. Main Board Al - Schematic 6 ......... 10.4-7
10.4-5. Main Board Al - Schematic 7 .........
10.4-g
10.4-6. Shaper IC Input Signals on Pins 18/19 ..... 10.4-11
10.4-7. Shaper IC Output on Pin 12 .......... 10.4-11
10.4-8. Shaper IC Output (FIXED) .......... 10.4-12
10.4-g. Shaper IC Output (LINEAR)
.........
10.4-12
10.4-10. Shaper IC Output (FIXED, HIL +0.99 V) ....
10.4-12
10.4-11. Main Board Al - Component layout ...... 10.4-17
10.4-12. Main Board Al - Component locator ......
10.4-19
10.5-l. Principle of DAC Operation .......... 10.5-2
10.5-2. DAC - Reciprocal operation ..........
10.5-3
Contents-14