HP 4262A Service manual

Errata
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Manual Part Number:
Revision Date:
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4262A LCR Meter Operating and Service Manual
04262-90007
October 1983

WP
4262A
OPERATING
AND
SERVICE
MANUAL
4262A
DIGITAL LCR METER
49621‘« LCR A
5 TeATxAmy
1G58 a0 o6
AN USTTY (ALe BLMCIT 1CEAL
@o@% aJc) @“%@
o @u@a @ifi oo8
um mwvm
@/fl HEWLETT
PACKARD
LATAR
)

MANUAL CHANGES
‘
——
MANUAL
IDENTIFICATION
——
4262A
:
Model
Number:
4262A
Date Printed: OCT. 1983
DIGITAL LCR METER Part Number: 04262-90007
" This supplement contains important information for correcting manual errors and for adapting the manual to instruments containing
improvements made after the printing of the manual.
To use this supplement:
[ Make all ERRATA corrections.
Make all appropriate serial number related changes indicated in the tables below.
SERIAL PREFIX OR NUMBER MAKE MANUAL CHANGES SERIAL PREFIX OR NUMBER MAKE N!ANUAL CHANGES
A11 1
> NEW ITEM
‘ ERRATA
Page 2-8, Table 2-1:
Add
the
following
item
to
the
option
101
(HP-IB)
components.
PN
2190-0577
2ea.
Spring
Washer
Page 3-22, Figure 3-9:
Delete
the
following
sentence
from
beneath
the
table
in
step
3:
"*Bias
current
when
+40V
is
applied
to
DC
BIAS
connector."
NOTE
Manual
change
supplements
are
revised
as
often
as
necessary
to
keep
manuals
as
current
and
accurate
as
possible.
Hewlett-Packard
recommends
that
you
periodically
request
the
latest
edition
of
this
supplement.
Free
copies
are
available
from
ail
HP
offices.
When
requesting
copies
quote
the
manual
identification
information
from
your
supplement,
or
the
model
number
and
print
date
from
the
title
page
of
the
manual.
‘ Date/Div: sep. 19, 1984/33 (fi HEWLETT
Page 1 of4 Y8 pAcKARD
Printed in Japan

» Page 4-24, Figure 4-9: . )
Correct the TTL outputs table in Figure 4-9 as follows:
Comparison | TTL output pins*
LCR 19 20 45
WiGH | i 0.C. LOW LOW
w | LOW LOW 0.C.
LOW j_ _____ LOW 0.C. LOW
DQ o 15 16 41
HIGH 0.C. LOW LOW
N | LOW LOW 0.C.
oW | LOW 0.C. LOW
* TTL low-level output is indicated as LOW, and
open-collector turn-off state is indicated as 0.C.
» Page 8-47, Figure 8-29:
Change the part number for the power transformer to
9100-0865.

Page 8-53, Figure 8-39,
Correct the flow diagram as shown below:
PROCEDURE: 1
START ————»
Set 4262A controls as follows:
FUNCTION. ... .......... C
CIRCUIT MODE. ... ... PRL
LCR RANGE . ....... AUTO
TRIGGER. ............ INT
Unknown ....... Open(0pF)
Observe waveforms at A14TP5
and TP4. Do they have precisely
the same phase as each other for
all test frequencies (120, 1k and
10kHz)? See photo below.
A14TP4
Al4TP5
NO
() Q19 Gate
Q22 Gate
Monitor signals at A14Q19 and
Q22 Gates. Do they look like
this?
5V/div
YES
Monitor signal at A14Q6 Collector.
@ Is the waveform as illustrated?
Does the signal frequency
satisfy the table below?
Is signal at A14TP4 a
squarewave?
NO
I
YES
~
/
\
/ Is signal at A14U9 pin 3
.5Vp-p pulse? 1
-
NO
!
Check A14Q8.
\
~
~— —
YE§'
,
Is potential difference be-
tween A14Q7 Base and
Emitter 0.6Vdc?
NC
Check A14Q7.
YES
Check A14U9.
Check
Result
A14Q24
Can a pulsed waveform be observed
at A14U8 pin 11?
Is dc level at A14Q21 (Q24)
Emitter 3V?
éll‘?Q?
Is
amplitude
of
the
pulse
NO
Does
4Vp-p
square
pulse
NO
ollector
at
A14Q6
Collector
15Vp-p?
appear
at
A14U13
pin6?
[~
TEST
SIGNAL
Frequency
/,—YES\\
-
YES\
120Hz 120Hz
(8.3ms)
,
4
~ N
i
~
N
1kHz
1kHz
(1ms)
"
=
Monitor
signal
at
A14Q6
10kHz
1kHz
(1ms)
Base.
Is
tfi'e’
pulse
with.h
1
!
R‘l’jsu‘gvl‘?'i’
E,“‘s"
appear
at
{NO
YES
A
10us?
\
pin
§?
]
\
A
\
[YES
NO/
\
YES
/
N
~
7/
N
7/
J
~
e
-
+ ~
-
_
-
e
Go
to
PROCEDURE
2
NO
Check
A14U13.
Check
A14US.
g;‘fgk
Al4Q6
and

CHANGE 1
» Page 1-10, Table 1-4:
Change
the
recommended
oscilloscope
to
the
HP
1740A.
Table 6-3:
Change the table as shown below:
Reference
HP
Part
Description
Designation
Number
A14
Q4
1855-0570
TRANSISTOR
J-FET
N-CHAN
SI
RS
(ZERO
ADJ
L)
2100-4086
RESISTOR-VAR
500 10%
66
04262-24004
NUT-HEX-DBL-CHAM
1/4-32-THD
68
2190-0016
WASHER-LK
INTL
T
NO.-3/8
Page
6-25:
Add
a
washer
(reference
designation
(&)
to
the
illustration,
as
shown
below:

| (’5,” HEWLETT
PACKARD
OPERATING AND SERVICE MANUAL
MODEL 4262A
LCR METER
(including Options 001,004, 010, and 101)
SERIAL NUMBERS
This
manual
applies
directly
to
instruments
with
serial
numbers
prefixed
2022J
With changes described in Section VI, this
manual also applies to instruments with serial
numbers prefixed 1710J, and 1739J.
For additional important information about serial
numbers, see INSTRUMENTS COVERED BY MAN-
UAL in Section |.
© COPYRIGHT: YOKOGAWA-HEWLETT-PACKARD, LTD.,1977
9-1, TAKAKURA-CHO, HACHIOJI-SHI, TOKYO, JAPAN
Manual
Part
No.
04262-90007
_
Microfiche
Part
No.
04262-90057
Printed:
0CT.
1983

Table of Contents Model 4262A
TABLE OF CONTENTS
Section Title Page Section Title Page
I GENERAL INFORMATION.........ccc0utn 1-1 3-30. Terminal Configuration ........... 3-10
1-1. Introduction..........ccivevevnnns 11 3-32. Offset Adjustment ................ 3-10
1-4, Description .....covvviiiiiiennns 1-1 3-40. Option Operation ................. 3-27
1-8, Specifications .....o0ovevenieeennns 1-7 3-42, Option 001: BCD Parallel Data
1-10. Safety Considerations ......... 1-7 Output ...covvieviiieiinnianen, 3-27
1-13. Instruments Covered by Manual 1-7 3-44. Output Data and Pin
1-18. Options .. .veereereennnerannss 1-8 Assignment.........0000nn 3-27
1-20. Option 001 .............. 1-8 3-46. Alternate Output of LCR and .
1-22. Option 004 .............. 1-8 D/QData....c.ovvunneeenns 3-27
1-24, Option 101 .............. 1-8 3-47, Output Timing.......o00ven.. 3-27
1-26. Option 010 .............. 1-8 3-49. Option 004-COMPARATOR ....... 3-30
1-28. Other Options........... 1-8 3-51. Front Panel Features
1-31, Accessories Supplied ......c0uen.. 1-8 (Figure 3-42) ...cvvvvvvenns 3-30
1-33. Equipment Available .............. 1-8 3-52. LIMIT Setting Warning ....... 3-31
I INSTALLATION .eouvenenneeinnnnnnennns 2-1 3-53. OUTPUT Connector Decision |
2-1 Introduction ........evvveeeennnns 2-1 [ OWPUL - seeeeeeineneeeann -
2-3. Initial Inspection........eevvenenns 2-1 g-gg Option 101: HP-IB .........co. ... 3_33
2-5 Preparation for Use ..........0uus 2-1 oo’ Connection to HP-IB Controller 3-3
2-6 Power Requirements.......... 2-1 g'gz EgéIfLStsfiflts ;ndlcator """" g'gg
. ; -64. itech vovviienennnn. -
28 Line Vollage and Fuse Selection 2 3-65. HP-IB Interface Capabilities .. 3-32
2-14: Interconnectic;n.s' . ......... 2-3 3-66. S(;;lrrfgsfizfi é(:si{efto;}n 3_39
2-16. Operating’ Environment........ 2-3 3-67 Talier Cap(;bilit ’ T5 e 3-39
2-19, Installation Instructions ....... 2-3 368, Functions Relate‘(’i'to o
2-21, Installation of Options ) Talker Capabilit 3-33
907, 908 and 909 ...... 2-3 sarker Lapaplily ... ..
2-23. Storage and Shifiment ............ 2-3 3-69. Listener Capability: L4 . 3-33
9-24. Environment ................. 2-3 3-70. Service Request
2-26. PACKAgING +vvvvvverenronnnns 2-3 371 Capability: SR ....... 3-33
2-29. Option IStallation ... ............. 2-6 -1, R‘émtg./llft“,aém 336
2-31, Option 001 BCD Data Output 372 Do e -
TNSEAllAtion «.eeeennnnnenes.. 2-6 -12. ‘é‘;’;f:bfiif;_rDcl 536
a3 O stallation 1 . 2-6 3-13. Device Trigge” | 336
2-33. Coupling Option 004 Comparator 374, ADDRESS Switch .. ..r..10.. 3.36
giggpfigga?&tilgflj Data 9.6 3-75, Remote Message Coding...... 3-36
2-34. Option 101 HP-IB Remote Control
and Data Output Installation. .. 2-6 1V ERFOURCRCRIRST oo 40
4-3. Equipment Required .....e0e0uvuns 4-1
4-5. TestRecord .....covevesenasanaes 4-1
II OPERATION .......cuveiennnnenenennnnns 3-1 4-7. Calibration Cycle................. 4-1
3-1. INtroduction............ceeeesne.. 3-1 —— Preliminary Qperations ........... 4-2
3-3. Panel Features.........couvueunes 3-1 —— Calibration of DUT's.............. 4-4
3.5 Self Test (Basic Operating Check) .. 3-1 4-9, Measu_rement Frequency Test...... 4-17
3-7. Test Signals ....ovvveererennnnnns 3-6 4-10. Capacitance Accuracy Test ........ 4-8
3-9. Measurement Range .............. 3-6 4-11. Resistance/ESR Accuracy Test.... 4-12
3-11. Initial Display Test «.eeuvervenn... 3-17 4-12. Dissipation Factor Confirmation Check . 4-14
3-13. Initial Control Settings ............ 3-1 4-13, Inductance Accuracy Test ........ 4-117
3-15. D/Q Measurement ............o... 3.7 4-14. Internal DC Bias Source Test ..... 4-19
3-17. LCR Measurement .............. 3.7 4-15., Offset Adjustment Test..oevvuinnn 4-20
3-19. D/Q Blanking Function (Switch 4-16, Comparator Test (Option 004 Only) 4-22
selectable function inside cabinet). 3-9 4-17. HP-IB Interface Test
3-21, General Component Measurement .. 3-9 (Option 101 Only) ..eeuennnnnnnn. 4-25
3-23. Semiconductor Device Measurement 3-9
3-25. External DCBias........c.c.c.une 3-9
3-28. External Triggering .............. 3-9
ii

Model 4262A
TABLE OF CONTENTS
Section Title Page
V ADJUSTMENT .......... Cesseretreannaas 5-1
5-1.
Introduction...........oveueuennnn.
5-1
5-3.
Safety
Requirements
..............
5-1
5-7.
Equipment
Required
........00v...
5-1
5-9,
Factory
Selected
Components
......
5-1
5-12. Adjustment Relationships.......... 5-1
5-14, Adjustment Locations ............. 5-1
5-16. DUT Adjustment Recommendations . 5-4
5-1 Initial Operating Procedure........ 5-5
5-20. DC Power Supply Adjustment,...... 5-6
5-21. Nanoprocessor Operating Power
Voltage Adjustment.............. 5-7
5-22. Al2 Board Offset Adjustment....... 5-8
5-23. Al3 Board Offset Adjustment,...... 5-9
5-24. Al4 Phase Detector & Integrator
Adjustment ........c0iiiinnnn. 5-14
5-25. 10kHz Measurement Accuracy
Adjustment ......ciivviiennnnns 5-17
5-26. C Zero ADJ Circuit Adjustment
(AL2) L.ttt i et 5-22
VI REPLACEABLE PARTS ...cvvvnivienennss 6-1
6-1., Introduction.......eeovvvennnn eees B-1
6-3. Abbreviations ............. cerrras 6-1
6-5. Replaceable Parts List............ 6-1
6-7. Ordering Information ......... eees 6-2
6-12. Direct Mail Order System ......... 6-2
VII MANUAL CHANGES .. ..0iitvitverenennnn 7-1
7-1. Introduction..........ccvvvvueenn. 7-1
7-3. Manual Changes ......covvveevnnren 7-1
VIISERVICE .....vtiiiteiiiinsenecenconnnens 8-1
8-1. Introduction.........ceeoeeeenevenn 8-1
8-3. Theory of Operation .............. 8-1
8-5. Troubleshooting ............ creeas 8-1
8-7. Recommended Test Equipment ..... 8-1
8-9 Repair..civieeereninrannnns cesese 8-1
Section
8-11,
8-21,
8-22.
8-23.
Table of Contents
Title Page
Basic Theory ....vevvveeenecnnnas 8-2
Principles of Operation ,.......... 8-4
Block Diagram Discussion......... 8-8
Analog Section Discussion ...., 8-8
All Oscillator and
Source Resistor ....... 8-8
Al2 Range Resistor...... 8-8
Al3 Process Amplifier.,., 8-8
Al4 Phase Detector and
Integrator............. 8-8
Digital Control Section ....... 8-10
A23 Processor and ROM 8-10
A21 Keyboard Control .. 8-11
A22 Display Control
&RAM .......ccuvt.. 8-11
A2 Display and Keyboard 8-11
Timing Diagram Discussion....... 8-12
Options...vvverevennnnne cesesenn 8-14
Option 001 BCD Data
Output (A35) ...... ceeiaesens 8-14
Option 004 Comparator
(A4, A5 & A24)............. 8-15
Option 101 HP-IB
Compatible (A25).......... . 8-15
Troubleshooting ........c0vvveve. 8-16
Repair....ovvviieiiiennncennnasns 8-26
Removal of Q2 and Q3 ............ 8-26
Line Switch (S1) Removal......... 8-26
Protective Diode Replacement
(CR4, CR5, CR6 and CRT)...... . 8-27
ZERO ADJ Control Potentiometer
(R4 and R5) Replacement........ 8-217
A2 Keyboard and Display
Board Disassembly............. 8-27
Keyboard Switch LED Replacement 8-28
Product Safety Checks............ 8-29
iii

List of Tables
List of Ilustrations
LIST OF TABLES
Number Title Page
1-1 Specifications ....vvevvrvernncenns 1-2
1-2 General Information,.............. 1-6
1-3. Equipment Available .............. 1-9
1-4 Recommended Test Equipment .... 1-10
2-1, Option Components .........c..... 2-8
3-1 Test Signal Level....cvieeeeeeennn 3-6
3-2 Measurement Ranges.......o.v0... 3-6
3-3. Annunciation Display Meanings.... 3-12
3-4. Unusual Operating Indications..... 3-21
3-60. Remote Program Codes .......... 3-32
3-61, Remote Message Coding.,........ 3-33
4-1., Recommended Components for
Accuracy Checks ......c0uvee 4-6
Number Title Page
1-1, Model 4262A and Accessories...... 1-1
1-2, Serial Number Plate .............. 1-7
2-1 Voltage and Fuse Selection,........ 2-2
2-2
Power Cable .......ocviiiiiinenn. 2-4
2-3 Rack Mount Kit................... 2-5
2-4 Option Installation Hlustrations..... 2-7
3-1 Front Panel Features ............. 3-2
3-2 Rear Panel Features.............. 3-4
3-3 Test Fixture and Leads............ 3-8
3-4 Measurement Error due to
Misadjusted ZERO ADJ controls .. 3-10
3-5. Conversion between Parallel and
Series Equivalents ...........
3-6. Relationship of Dissipation to
Series and Parallel Resistance....3-13
-40, Pin Assignments of Qutput
Connector and Output Format.....
External DC Bias Circuits......
3-7. General Component Measurements. ., 3-15
3-8. Semiconductor Device Measurement 3-18
3-9 ...3-20
3-4
3-28
3-41. Timing Chart of BCD Data Output...3-29
3-42. Front Panel Features ..........
3-43. Option 004: COMPARATOR .....
3-44. Pin Location of Comparator
Data Qutput ... .vevvenennnens
iv
4-1 Measurement Frequency Test Setup., 4-7
4-2. Capacitance Accuracy Test Setup... 4-8
4-3 Resistance Accuracy Test Setup....4-12
Model 4262A
Title Page
Adjustable Components............ 5-2 ,
Factory Selected Components ...... 5-3
DUT's Recommended for
Making Adjustments ........ .. 5-4
Adjustment Requirements.......... 5-5
List of Reference Designators
and Abbreviations............. 6-1
Manufacturers Code List .......... 6-2
Replaceable Parts ....ovvvvenennns 6-3
Option 010 Modifieation ......... e 6-24
Manual Changes by Serial Number.. 7-1
Summary of Changes by Assembly.. 7-1
Currently Available Options ...... 8-14
Symptoms Likely to Mislead ...... 8-18
Front Panel Symptoms of Internal
Control Misadjustment ....... 8-19
Front Panel Isolation Procedure .. 8-20
Title Page
Dissipation Factor Confirmation Check
SetUpPS: «eeersnnenes e ereeeasaan 4-14
Inductance Accuracy Test Setup ... 4-17
Internal DC Bias Source
Test SetUpP.vviierteenrencsrnnens 4-19
Offset Adjustment Test Setup...... 4-20
Comparator Test Setups.......... 4-22
Comparator Output (J6) data format 4-24
HP-IB Interface Test Setup ....... 4-25
SRQ Service Routing ..... cresenas 4-29
Power Supply Voltage Adjustment... 5-6
Nanoprocessor Operating Power
Voltage Adjustment Location ..... 5-7
Al2 Board Offset Adjustment ...... 5-8
Waveform at A12Q11 Source ....... 5-9
Al3 Board Offset Adjustment....... 5-9
Waveform at A13TP1 ............ 5-10
Waveform at A13TP2 ............ 5-11
Waveform at A13TP3 ............ 5-12
Ald Phase Detector & Integrator
Adjustment ......ciiiienanian. 5-13
A228S1 Switch Setting . ....v.ue.... 5-14
Zero Detector & APAO Adjustments 5-15
10kHz Measurement Accuracy
Adjustment .. ...iiiieiieneeenn 5-17
Offset Adjustment Setup .......... 5-22
Major Mechanical Parts
- Exploded View ............... 6-23
Mechanical Parts
- Exploded View ............... 6-25

CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifica-
tions at the time of shipment from the factory. Hewlett-Packard further certifies
that its calibration measurements are traceable to the United States National Bu-
reau of Standards, to the extent allowed by the Bureau's calibration faecility, 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, except that in
the case of certain components listed in Section 1 of this manual, the warranty
shall be for the specified period. During the warranty period, Hewlett-Packard
Company 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 in-
strument will execute its programming instructions when properly installed on that
instrument. HP does not warrant that the operation of the instrument, or soft-
ware, or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inade-
quate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized
modification or misuse, operation outside of the environment specifications for the
product, or improper site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DIS-
CLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILTY 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 CONSEQUENTIAL DAMAGES, WHETHER BASED ON CON-
TRACT, TORT, OR ANY OTHER LEGAL THLORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are
available for Hewlett-Packard produects.
For
any
assistance,
contact
your
nearest
Hewlett-Packard
Sales
and
Service
Office.
Addresses
are
provided
at
the
back
of
this
manual.

SAFETY SYMBOLS
General
Definitions
of
Safety
Symbols
Used
On
Equipment
or
In
Manuals.
WARNING
CAUTION
Note
Instruction
manual
symbol:
the
product
will
be
marked
with
this
symbol
when
it
is
necessary
for
the
user
to
refer
to
the
instruction
manual
in
order
to
protect
against
damage
to
the
instrument.
Indicates
dangerous
voltage
(terminals
fed
from
the
interior
by
voltage
exceeding
1000
volts
must be so
marked).
Protective
conductor
terminal.
For
protection
against
eleetri-
cal
shock
in
case
of
a
fault.
Used
with
field
wiring
terminals
to
indicate
the
terminal
which
must
be
connected
to
ground
before
operating
equipment.
Low-noise
or
noiseless,
clean
ground
(earth)
terminal.
Used
for
a
signal
common,
as
well
as
providing
protection
against
elec-
trical
shock
in
case
of
fault.
A
terminal
marked
with
this
symbol
must
be
connected
to
ground
in
the
manner
described
in
the
installation
(operating)
manual,
and
before
operating
the
equipment.
Frame
or
chassis
terminal.
A
connection
to
the
frame
(chas-
sis)
of
the
equipment
which
normally
includes
all
exposed
metal
structures.
Alternating current (power line).
Direct current (power line).
Alternating or direct current (power line).
A
WARNING
denotes
a
hazard.
It
calls
attention
to
a
pro-
cedure,
practice,
condition
or
the
like,
which,
if
not
correctly
performed
or
adhered
to,
could
result
in
injury
or
death
to
personnel.
The
CAUTION
sign
denotes
a
hazard.
It
calls
attention
to
an
operating
procedure,
practice,
condition
or
the
like,
which,
if
not
correctly
performed
or
adhered
to,
could
result
in
damage
to
or
destruction
of
part
or
all
of
the
product.
A
Note
denotes
important
information.
It
ecalls
attention
to
a
procedure,
practice,
condition
or
the
like,
which
is
essential
to
highlight.

Model 4262A
O
O
0O
OO
OO0
O
Co
o
]
=
0
0TI
DUT
WD
LIST OF ILLUSTRATIONS
Title Page
Basic Block Diagram ............. 8-2
Cp Measurement ......coeeevenesn 8-3
Measurement Principles........... 8-7
Offset Control Principle........... 8-6
DC Bias Circuit ....o0vviveinennn. 8-6
Analog Section Block Diagram...... 8-9
Digital Section Block Diagram...... 8-11
Timing Diagram ......ecevveennan 8-13
Option Section Block Diagram...... 8-15
How to Use Troubleshooting Guides.8-17
Self Test Function ...........0uuun 8-21
Signature Analysis Guide .......... 8-23
Protective Diode and ZERO ADJ
Control Potentiometer
Replacement...........co0vunnnn 8-26
A2 Keyboard and Display
Board Disassembly.....cco0vueen. 8-217
Inserting Tubing into Switch Plunger 8-28
LED Installation in Switch ......... 8-28
Analog and Digital Section
Isolation Procedure ............. 8-31
Analog Section Troubleshooting
Procedure to Assembly Level.....8-33
Digital Section Troubleshooting
Procedures ................l. 8-35
Schematic Diagram Notes........ ..8-43
Assembly Locations.......ovoevvess 8-43
Adjustment Locations ............. 8-43
Front Panel Component Locations ..
Rear Panel Component Locations...
A2 Keyboard & Display Board
Assembly Component Locations...
A2 Keyboard & Display Board
Assembly Schematic Diagram ....
A9 Power Supply Board
Troubleshooting Tree............ 8-46
A9 Power Supply Board Assembly
Component Locations ............ 8-417
A9 Power Supply Board Assembly
Schematic Diagram ............. 8-417
All OSC & Source Resistor Board
Troubleshooting Tree............ 8-48
All OSC & Source Resistor Board
Assembly Component Locations ..
All OSC & Source Resistor Board
Assembly Schematic Diagram ..,.8-49
Al2 Range Resistor Board
Troubleshooting Tree ........... 8-50
Al2 Range Resistor Board Assembly
Component Locations ............ 8-51
Al2 Range Resistor Board
Assembly Schematic Diagram..... 8-51
Al3 Process Amplifier Board
Troubleshooting Tree............ 8-52
Number
8-37.
8-38,
8-39.
8-40,
8-41,
8-42.
8-43.
8-44,
8-45.
8-46.
8-417.
8-48.
8-49.
8-50,
8-51,
8-52.
8-53.
8-54.
8-55.
8-56.
8-517.
8-58.
8-59.
8-60.
List of Illustrations
Title
Al13 Process Amplifier Board
Assembly Component Locations. ..
Al3 Process Amplifier Board
Assembly Schematic Diagram..... 8-53
Al4 Phase Detector & Integrator
Board Troubleshooting Tree(A) ...
Al4 Phase Detector & Integrator
Board Troubleshooting Tree(B) ...
Al4 Phase Detector & Integrator
Board Assembly
Component Locations ............ 8-57
Al4 Phase Detector & Integrator
Board Assembly
Schematic Diagram ............. 8-57
A21 Keyboard Control Board
Assembly Component Locations, ..
A2l Keyboard Control Board
Assembly Schematic Diagram ....
A22 Display Control & RAM Board
Assembly Component Locations...8-61
A22 Display Control & RAM Board
Assembly Schematic Diagram ...
A23 Processor & ROM Board
Assembly Component Locations...8-63
A23 Processor & ROM Board
Assembly Schematic Diagram ...
A4 Thumbwheel Switch Board
Assembly Component Locations...8-65
A5 Comparator Keyboard Board
Assembly Component Locations...8-65
A4 Thumbwheel Switch Board and
A5 Comparator Keyboard Board
Assembly Schematic Diagram .
A24 Comparator Control Board
Diagnostic Flow Diagram ........ 8-66
A24 Comparator Control Board
Assembly Component Locations...8-67
A24 Comparator Control Board
Assembly Schematic Diagram
A25 HP-IB Interface Board
Diagnostic Flow Diagram......... 8-68
A25 HP-IB Interface Board
Assembly Component Locations..,8-69
A25 HP-IB Interface Board
Assembly Schematic Diagram ...
A35 BCD Output Control Board
Diagnostic Flow Diagram ........ 8-70
A35 BCD Output Control Board
Assembly Component Locations...8-71
A35 BCD Output Control Board
Assembly Schematic Diagram ...
.8-61
.8-63
..8-65
cee.8-67
.8-69
.8-71

Model 4262A
Section I
Paragraphs 1-1 to 1-6
SECTION |
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. This operating and service manual contains
the information required to install, operate, test,
adjust and service the Hewlett-Packard Model
4262A Digital LCR Meter. Figure 1-1 shows the in-
strument and supplied accessories. This section
covers specifications, instrument identification,
description, options, accessories, and other basic
information.
1-3. Listed on the title page of this manual is a
microfiche part number. This number can be used
to order 4 x 6 inch microfilm transparencies of the
manual. Each microfiche contains up to 60 photo-
duplicates of the manual pages. The microfiche
package also includes the latest manual changes
supplement as well as all pertinent service notes.
To order an additional manual, use the part num-
ber listed on the title page of this manual.
1-4. DESCRIPTION.
1-5. The HP Model 4262A LCR Meter is a general
purpose, fully automatic test instrument designed
to measure the parameters of an impedance ele-
ment with high accuracy and speed. The 4262A
measures capacitance, inductance, resistance (equi-
valent series resistance) and dissipation factor or
quality factor over a wide range at test frequencies
of 120Hz, 1kHz and 10kHz employing a five-term-
inal connection configuration between the com-
ponent and the instrument. The measuring circuit
for the device to be measured is capable of both
parallel and series equivalent circuit measurements
and the measured values are displayed by the two
three-full digits LED displays on the front panel.
A convenient diagnostic function, also featured in
the 4262A, is actuated by a SELF TEST switch.
This confirms functional operation of the instrument.
1-6. The measuring range for capacitance is from
0.01pF to 19.99mF, inductance from 0.01uH to
1999H, and resistance from 1mQ to 19.99MQ,
which are measured with a basic accuracy of 0.2
to 0.3% depending on test signal level, frequency,
and measuring equivalent circuit, and at typical
measuring speeds of 220 to 260 milliseconds at
P/N 8120-1378
Figure 1-1. Model 4262A and Accessories.
11

Section 1
Table 1-1
Model 4262A
Table 1-1. Specifications (Sheet 1 of 4).
COMMON SPECIFICATIONS
Parameters Measured: C - D or Q (1/D)
L-DorQ(1/D)
R (ESR) (Loss measure-
ment can be negated by
switch on internal board).
Display: 3-1/2 Digit, Maximum Display 1999
(When D value is more than 10, max-
mum display is 199).
Measurement Circuit Modes:
Auto, Parallel, and Series
Measurement Terminals: 5-terminal configura-
tion (high and low terminals for both
potential and current leads plus guard).
Range Modes: LCR - Auto and Manual
(up-down)
Deviation Measurement: When 2ALCR key is de-
pressed, the existing measured value
is stored as a reference value and
displayed value is offset to zero. The
range is held and deviation is dis-
played as the difference between the
referenced value and subsequent re-
sult. (Deviation spread in counts
from -999 to 1999).
Offset Adjustment: Stray capacitance and re-
sidual inductance of test jig can be
compensated for as follows:
C: up to 10pF
L: up to 1uH
Self Test: Annunciates either Pass, or Fail for
performance in each of the five basic
DQ - Auto and Manual (step) ranges.
DC Bias:
Measurement Frequencies: 120(100)Hz, 1kHz Internal: 1.6V, 2.2V, 6V (Selectable at front
and 10kHz 1+3%. panel). Accuracy £5%
External: External DC bias connector on rear
panel. Maximum +40V.
Test Signal Level: Normal level: 1Vrms.
Low level : 50mVrms (parallel Trigger: Internal, External, or Manual
capacitance mode only)
Warm-up Time: 15 minutes
GENERAL
Operating Temperature & Humidity:
0°C to 55°C at 95% RH(to 40°C)
Power Requirements: 100/120/220V +10%,
240V +5% -10% 48 - 66Hz
Power Consumption: 55VA with any option
Dimensions: 426(W) x 147(H) x 345(D)mm
(16-3/4° x 5-3/4” x 13-3/4”)
Weight: Approximately 8kg (Std)
1-2

Model 4262A Section I
Table 1-1
Table 1-1. Specifications (Sheet 2 of 4).
C-D, C-QMEASUREMENT
120Hz|1000pF |10.00nF|100.0nF|1000nF [10.004F[100.0uF|1000uF [10.00mF
C 1kHz|100.0pF{1000pF |10.00nF|100.0nF 1000nF|10.00xF|100.0uF|1000uF
10kHz| 10.00pF|100.0pFj1000pF {10.00nF|100.0nF|1000nF |10.00uF{100.0uF
Ranges
D .001~19.9 (2 Ranges)
Q™ 0.05~-1000 (4 Ranges)
o 1V or 50mV (LOW LEVEL) ]
Test Signal W [100A 1004A 1mA 10mA 40mA|
Level =2 AUTO [ Sameas i} Mode || Sameas 4rw Mode |
[ 0.2% + 1 counts | (Test signal level; 1V)
{u} [ 2= [ 0.3% + 2 counts | (Test signal level; 50mV)
C Accuracy *3 A (At 120Hz, 1kHz) | 0.83%+2counts || 3% |[ e’
(At 10kHz) | 0.3% +2counts |[1% + 2][5% + 2]
AUTO || Sameas ¥ Mode || Sameas 4w Mode |
[ 0.2% + (2 + 200/Cx) counts | At 120Hz, 1kHz
| 055% + (2.+ 200/Cx) counts ] L Lest signal level; 1V)
R | 0:3% + (2 + 1000/Cx) counts | At 120Hz, 1kHz
DA [1.0% + (2 1000/Cx) counts |\ 0" 50 evel; 50mV)
v
(At120Hz,
1kHz)
[
0.3%
+
(2
+
Cx/500)
counts
|f-6-S5)
(At 10kHZ) L 0.5% + (2 + Cx/500) counts I[l%f(fi‘ Cx 1IE%+(54
o}
500 00!
51
AUTO [ Sameas T+ Mode || Sameas -AM#w Mode |
*1 Calculated from D value as a reciprocal number.
*2 Typical data, varies with value of D and number of counts.
*3 #(% of reading + counts). Cx is capacitance readout in counts. This accuracy only applies for
D values to 1.999. (For higher D values, refer to General Information).
*4 (5% + 2 counts) at 1kHz.
Accuracy
applies
over
a
temperature
range
of
23°C
£
5°C
(At
0°C
to
55°C,
error
doubles).
Note: C accuracy for higher D values are unspecified.
1-3

Section I Model 4262A
Table 1-1
Table 1-1. Specifications (Sheet 3 of 4).
L-D, L-Q MEASUREMENT
120Hz | 1000xH | 10.00mH|100.0mH [1000mH |10.00H | 100.0H | 1000H
L 1kHz| 100.04H | 1000¢H |10.00mH [100.0mH | 1000mH | 10.00H | 100.0H
Ranges 10kHz | 10.00xH [ 100.04H [1000xH [10.00mH | 100.0mH| 1000mH | 10.00H
D .001~19.9 (2 Ranges)
Q" 0.05~ 1000 (4 Ranges)
Lo+
L
1v
]
TestSignal " o | 40mA _ 10mA ImA _ 100uA _ 104A |
auto || Sameas ™ Mode || Sameas Tt Mode |
(At 120Hz, 1kHz) [ 0.83%+2counts |[ 1%+ 2counts |
'@D" (At 10kHz) [ 0.3% +2counts |[1%+2 ] 5%+2 |
L Accuracy*s [ 0.2% + 2 counts | (At 120Hz, 1kHz)
T W [0.3% + 2] 0.2% + 2 counts | (At 10xHz)
auto || Sameas -w Mode || Sameas {JY Mode |
(At 120Hz, 1kHz) [0.8% + (3 + Lx/500)[1% + (3 + Lx/500)
-(33}
(At
10kHz)
[0.5%
+
(3
+
Lx/500)|
[
15+
6%
|[
s+
65
|
R((xl:{?gc L 0.2% + (3 + 200/Lx) counts —l (At 120Hz, 1kHz)
y -
[ 0.5% + (8 + 200/Lx) counts | (At 1kHz)
AUTO || Sameas -www Mode || Sameas -@- Mode |
*1 Calculated from D value as a reciprocal number.
*2 Typical data, varies with value of D and number of counts.
*3 3(% of reading + counts). Lxis inductance readout in counts. This accuracy only applies for
D values to 1.999.
Accuracy applies over a temperature range of 23°C % 5°C. (At 0°C to 55°C, error doubles).
R/ESR MEASUREMENT
120Hz
Ranges R/ESRlil)kHZ 1000m$2 [10:008 [100.0Q | 1000 [10.00k22[100.0k$2|1000k2)10.00MS2
kHz
Enian [ 1v ]
i —1wW— .
Test Signal 40mA 10mA 1mA 100uA 10uA
Level *1 YA
AUTO
||
Sameas
4bw--mwwMode
|[
Sameas
1wt
Mode
|
o
[
0.3%
+
2
counts
*?
]
- 0.2% + 2 ts | Accuracy *2 W 2% coun
AUTO
||___Sameas
4pw-wrw-Mode
|[
Sameas
Gt
Mode
|
*1 Typical data, varies with number of counts.
*2 £(% of reading + counts).
*3 (0.5% + 2 eounts) on 10.00MQ range at 10kHz.
*%
Measurement
range
for
ESR
(equivalent
series
resistance)
is
from
1m$
to
19.99kQ
(typical),
which
varies
with
series
capacitance
and
inductance
value
. .
. .
refer
to
“REFERENCE
DATA”.
Accuracy
applies
over
a
temperature
range
of
23°C
£
5°C.
(At
0°C
to
55°C,
error
doubles.)
1-4

Model 4262A
Section I
Table 1-1
Table 1-1. Specifications (Sheet 4 of 4).
OPTIONS
Option 001: Simultaneous BCD output of LCR
and DQ data (positive true). Max. sink
current 16mA. Mating connector (P/N
1251-0086). (Alternate BCD output
of LCR and DQ data selectable by
switch on internal board).
Option 004: Digital comparator (can not be
used with OPT 101). Compares meas-
ured value with high and low limit set-
tings for LCR or DQ and provides
HIGH, IN, LOW comparison outputs.
Limit setting range: 0000 - 1999 for each
limit switch.
Comparison output: Visual, relay contact,
and TTL level.
Visual: 3 LED’s indicate HIGH(red), IN
(green), or LOW (red).
Relay contacts:
SPST contacts to circuit common
for each HIGH, IN and LOW output.
TTL level:
Open collector circuits to high level
(open) for each HIGH, IN and LOW
outputs (fanout max. 30mA).
Option 101: HP-IB data output & remote con-
trol.
Remotely controllable functions:
Function (L, C, R/ESR, 2LCR)
Loss (D, Q)
LCR range
DQ range
Circuit mode
Test frequency & level
Trigger
Self test
Data output: C - D/Q, L - D/Q, R/ESR
Internal function allowable subsets:
SH1, AH1, T5, L4, RL1, DC], SRl
and DTI.
Data output format: Either of two formats
may be selected. Switchable at rear
panel (no + sign outputs).
Format A.
SFFT+N.NNNE+NN, SF+N.NNCRYLE)
Format B.
SFFT+N.NNNE+NNCRYLF)
SF+N.NNCR(LE)
SFET
LL Test Frequency
Measurement Equivalent Circuit
LMeasurement Status
SF
[—Loss measurement D or Q
‘“—Measurement status
Option 010: 100Hz test frequency instead of
120Hz,
ACCESSORIES AVAILABLE
16061A: Test fixture, direct coupled, 5-terminal
Two kinds of inserts are included for
components with either axial or radial
leads. Usable on all ranges of 4262A.
16062A: Test cable with alligator clips, 4-termi-
nal. Useable for low impedance meas-
urements. Measurement range at 1kHz
is L £ 2H, C 2 200nF and R £ 10kQ.
[For L and C measurements, these
ranges increase by x10 at 120 (100)Hz
and decrease by same factor at
10kHz].
16063A: Test cable with alligator clips, 3-termi-
nal. Useable for high impedance meas-
urements. Measurement range at 1kHz
isL 23mH, C £ 10uF and R 2 200%.
[For L and C measurement, these
ranges increase by x10 at 120(100)Hz
and decrease by same factor at
10kHz].

Section 1
Table 1-2
Table 1-2. General Information.
Model 4262A
Measurement Times (typical):
For a 1000 count measurement on a low
loss component on a fixed range:
ESR (Equivalent Series Resistance)
Measurement:
Following tables show ESR measure-
ment range for capacitors and inductors.
3or4
Digit Display
L
100 1k 10k
2o0rl 3or4
Digit Dispiay Digit Display
10
120 Hz
1 kHz
Test Frequency Function Meas. Time iy
€5 . -
1kHz, 10kHz C/L 220-260ms SEE £ B oIl
R 120-160ms = oy
120(100)Hz C/L 900ms Wt 1 10 F
R 700mS 0mf~ 100m- 1 E
B
When autorange is selected the following o100 L0mi 100
times per range step must be added to 2 10
X |- 10004 10
the above times: 3
S 10 1004 10005
1kHz, 10kHz 45ms/180ms g
120(100)Hz 150ms/670ms § 10k 100
Lyl g 10g
When U-CL is displayed, the faster
ranging
time
is
selected.
171
S
P
S
Reading Rate: B 10
Internal - Approx. 30ms between end of Measurement Range of ESR (2)
measurement and start of next cycle. gg
g2 » £
External - Measurement cycle is initiated g‘?‘ = £ E
! . 1~ 10~ 100
by external trigger input.
. .
00mf
1
F
10
High D Factor Accuracies: ) "
Typical
g
lomp
100f
2 . . G
(22, 0n 10.00 range) Sl a1
Circuit Mode Accuracy ) R
e 5% +(2+1000/Cx) 3
& 10uf 1004f
o~ HW—o 5 % + (5 -+ Cx/500)
lpf 0wk
LYo
5
%
+
(5
+
Lx/500)
¢
R T T 10
oFTE WV 5 % +(3+200/Lx) Measurement Range of ESR (2)
MEASURING TIME
(ms)
---
When
LCR
RANGE
is
set
to
MANUAL
---
1000 Cp,Ls
000 l —T G5, Lp
ao0 ________.——"‘::_—-—————""—"—' |
Rs
700 — Re
T Rp
E 600
¥ s00
g 400
i
@
300
—
’
2 T R
e —— R
100
000 2000 3000 4000
( Counts)
Sum of Counts
on LCR ond DISSIPATION FACTOR Displays

Model 4262A
1kHz and 10kHz and about 900 milliseconds at
120Hz. The wide range capability of the 4262A
enables a measurement range from small capaci-
tances such as mica capacitors and the para-
sitic capacitance of a semiconductor device
through high capacitances such as the measurement
of electrolytic capacitors to be covered. A wide
range of inductance measurements from the in-
ductance of a high frequency transformer to that
of a power transformer can be measured. The wide
resistance range permits the measurement of wire-
wound resistors through the measurement of solid
resistors. In parallel capacitance measurements,
either a test signal level of 1Vrms, or 50mVrms
can be selected.
1-7. The 4262A has the capability of making
capacitance, inductance, and resistance deviation
measurements. This function is enabled by pushing
the A LCR switch to display the deviation of a re-
ference value. When the A LCR switch is depressed
the reference value is obtained and memorized
from the preceding measurement. The practi-
cal use of this feature is evident when it is desired
to make a measurement on a variable capacitor:
First, the minimum value is measured, then the A
LCR button is pushed, Minimum to maximum capa-
citance is now displayed as the capacitor is rotated
through its range. For parallel capacitance meas-
urements, test signal levels of either 1Vrms or
50mVrms may be selected. Other versatile 4262A
capabilities and features are, for example, the use
of internal and external dc bias voltages, LC zero
adjustment, and options providing BCD output,
HP-IB interfacing capability, or a comparator func-
tion.
1-8. SPECIFICATIONS.
1-9. Complete specifications of the Model 4262A
LCR Meter are given in Table 1-1. These specifi-
cations are the performance standards or limits
against which the instrument is tested. The test
procedures for the specifications are covered in
Section IV Performance Tests. Table 1-2 lists gen-
Figure 1-2. Serial Number Plate.
Section I
Paragraphs 1-7 to 1-16
eral information. General information is not speci-
fications but is typical characteristics included as
additional information for the operator. When the
4262A LCR Meter is shipped from the factory, it
meets the specifications listed in Table 1-1.
1-10. SAFETY CONSIDERATIONS.
1-11. The Model 4262A LCR Meter has been
designed to conform to the safety requirements of
an IEC (International Electromechanical Com-
mittee) Safety Class I instrument and is shipped
from the factory in a safe condition.
1-12. This operating and service manual contains
information, cautions, and warnings which must be
followed by the user to ensure safe operation and
to maintain the instrument in a safe condition.
1-13. INSTRUMENTS COVERED BY
MANUAL.
1-14. Hewlett-Packard uses a two-section nine
character serial number which is marked on the se-
rial number plate (Figure 1-2) attached to the in-
strument rear panel. The first four digits and the
letter are the serial prefix and the last five digits are
the suffix. The letter placed between the two sec-
tions identifies country where instrument was
manufactured. The prefix is the same for all iden-
tical
instruments;
it
changes
only
when
a
change
is
made to the instrument. The suffix, however, is as-
signed sequentially and is different for each in-
strument. The contents of this manual apply to in-
struments with the serial number prefix(es) listed
under SERIAL NUMBERS on the title page.
1-15. An instrument manufactured after the
printing of this manual may have a serial number
prefix that is not listed on the title page. This un-
listed serial number prefix indicates the instrument
is different from those described in this manual.
The manual for this new instrument may be ac-
companied by a yellow Manual Changes supple-
ment or have a different manual part number.
This supplement contains ‘“change information”
that explains how to adapt the manual to the
newer instrument.
1-16. In addition to change information, the
supplement may contain information for correct-
ing errors (called Errata) in the manual. To keep
this manual as current and accurate as possible,
Hewlett-Packard recommends that you periodically
request the latest Manual Changes supplement. The
supplement for this manual is identified with this
manual’s print date and part number, both of
which appear on the manual’s title page. Com-
plimentary copies of the supplement are available
from
Hewlett-Packard.
If
the
serial
prefix
or
number
of
an
instrument
is
lower
than
that
on
title
page
of
this
manual,
see
Section
VII
Manual
Changes.
1-7