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Model 3321/3322
LCZ Meter
Service Manual

Contains Operating and Servicing Information
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year
from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable
batteries, diskettes, and documentation.

During the warranty period, we will, at OUToption, either repair or replace any product that proves to be defective,

To exercise this warranty, write or call your local Keithley representative, 01 contact Kcithley headquarters in Cleveland, Ohio.
You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service
facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for
the balance of the original warranty period, or at least 90 days.

LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley's express written consent, or
misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from
battery leakage, or problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO-
VIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND SOFl.WARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM-
ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSON, OR DAMAGE TO PROPERTY.

Keitbley Instruments, Inc. - 28775 Aumra Road - Cleveland, OH 44139 - 440-248-0400 -Fax: 440-248-616X- http://www.keithley.com
Model 3321/3322 LCZ Meter
Service Manual

0 1991, Keithley Instruments, Inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
August 1991, First Printing
Document Number: 3321-902-01 Rev. A
All Keithley product names are trademarks or registered trademarks of Keithley Instmments, Inc.

Other brand and product names are trademark or registered trademark. of their respective holders
Safety Precautions

The following safety precautions should be observed before using the Model 3321/3322 LCZ Meter and any associated
instruments.

This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read over this manual carefulIy before using the instrument.

Exercise extreme caution when a shock hazard is present at the test circuit. The American National Standards Institute
(ANSI) states that a shock hazard exists when voltage levels greater than 30V rms or 42.4V peak are present. A good
safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Inspect the connecting cables and test leads for possible wear, cracks, or breaks before each use.

For maximum safety, do not touch the test cables or any instruments while power is applied to the circuit under test.
Turn off the power and discharge any capacitors before connecting or disconnecting cables from the instrument.

Do not touch any object which could provide a current path to the common side of the circuit under test or power line
(earth) ground. Always make measurements with dry hands while standing on a dry, Insulated surface capable of with-
standing the voltage being measured.

Instrumentation and accessories should not be connected to humans
HOW TO USE THIS MANUAL

Details procedures
stated specifications.
to verify that the instrument meets SECTION 1
Performance Verification

Describes basic operating principles for the various circuits in SECTION 2
the Model 3321/3322.
Principles of Operation

Covers fuse replacement, calibration and repair of the instru- SECTION 3
ment, and lists replacement parts.
Service Information
I I

WARNING
The information in this manual is intended for qualified serv-
ice personnel who can recognize possible shock hazards. Do
not attempt these procedures unless you are qualified to do so.
Table of Contents

SECTION 1- Performance Verification
1.1 ~RODUCnON .......................................................... ... l-1
1.2 INITIALCONDITIONS ......................................................... 1-l
1.3 LINEPOWER..........................................................~ ...... 1-l
1.4 VERILlCA~ONLIMITS.......................................................~ 1-l
1.5 MEASUREMFNTSIGNALTESTS ................................................. l-2
1.5.1 EnvironmentalConditions ..................................................... l-2
1.5.2 Recommended Test Equipment .................................................. 1-2
1.5.3 FrequencyAccuracy .......................................................... l-2
1.5.4 Measurement Signal Level Accuracy .............................................. l-3
1.5.5 Measurement Signal Distortion .................................................. 14
1.5.6 OutputImpedanceAccuracy .................................................... l-5
1.5.7 Internal Bias Voltage Accuracy .............................................. ... l-6
1.5.8 External DC Bias Voltage Range ................................................. l-7
1.6 MEASUREMENT ACCURACY TESTS .............................................. l-8
1.6.1 EnvironmentalConditions ..................................................... 1-8
1.6.2 RecommendedEquipment ..................................................... 1-8
1.6.3 Resistance Standards Accuracy .................................................. 1-8
1.64 Resistance Measurement Accuracy ............................................... l-9
1.6.5 Capacitance Reading Checks .................................................... l-12
1.6.6 InductanceReadingChecks .................................................... l-12

SECTION 2 - Principles of Operation
2.1 INTRODUCnON .............................................................. 2-l
2.2 BLOCKDLAGRAMS..........................................................~ 2-l
2.3 CURRENTANDVOLTAGEDETECTION ........................................... 2-l
2.4 lMI=EDANCECALCULATION ................................................... 2-l
2.5 OSCILLATOR ................................................................ 24
2.6 CURRENT-TO-VOLTAGE CONVERTER ............................................ 24
2.7 ANALYZER .................................................................. 2-5

SECTION 3- Service Information
3.1 INTRODUCTION ................... ........ 3-l
3.2 FUSE REPLACEMENT ................... ........ 3-l
3.2.1 Line Fuse ................... ........ 3-l
3.2.2 External Bias Fuse ....... ............ ........ ...... 3-l
3.3 CALIBRATION ................... ........ ...... 3-l
3.4 FAN FILTER CLEANING ................... ........ 3-2
3.5 REPAIR ................... 3-2
3.5.1 Factory Service 3-2
3.5.2 Cover Removal ....... .......... ............ 3-2
3.5.3 Battery Replacement ....... .......... ............ 3-3
3.5.4 Operation Check .......... ............ 3-4
3.5.5 Repair summary .......... ............ 3-4
3.6 REPLACEABLE PARTS .......... ............ 3-5
3.6.1 Parts List .......... ............ 3-5
3.6.2 Ordering Parts ............ 3-5

APPENDICES
A Model 3321 Specifications
B Model 3322 Specifications
List of Illustrations

SECTION 1- Performance Verification
Figure l-1 Connections for Frequency Accuracy Measurement ............ l-3
Figure l-2 Connections for Measurement Signal Level Accuracy .......... ......... 1-3
Figure l-3 Connections for Distortion Measurements ................... .. .... l-4
Figure l-4 Connections for Output Impedance Accuracy Tests ............ l-5
Figure l-5 Connections for Internal Bias Voltage Accuracy Tests .......... ......... l-6
Figure l-6 Connections for External Bias Voltage Range Tests ............ ......... 1-7
Figure l-7 Connections for Resistance Measurement Accuracy Measurements ......... 1-9
Figure l-8 Connections for Capacitance and Inductance Reading Checks .... ......... l-13

SECTION 2 - Principles of Operation
Figure 2-l Measuring System Block Diagram ......................... ......... 2-2
Figure 2-2 Hardware Block Diagram ............................... ....... 2-3
Figure 2-3 Oscillator Block Diagram ............................... ........ 24
Figure 2-4 Current-to-Voltage converter ............................ ......... 2-5
Figure 2-5 Analyzer ........................................... 2-j

SECTION 3- Service Information
Figure 3-l CoverRemoval....................................... ......... 3-3
Figure 3-Z ExplodedView....................................... ......... 3-6
List of Tables

SECTION 1- Performance Verification
Table 1-l Recommended Test Equipment for Measurement Signal Tests ........ l-2
Table 1-2 Measurement Signal Level Accuracy l-4
Table l-3 Distortion Measurement Summary ........ 14
Table l-4 Recommended Equipment for Measurement Accuracy Tests ........ 1-E
Table l-5 Resistance Accuracy Reading Limits ( I2 I ) for 1Vrms Level ...... I-10
Table 14 Resistance Accuracy Reading Limits 18) for 1Vrms Level ...... l-10
Table l-7 Resistance Accuracy Reading Limits ( I2 I ) for 50mVrms Level ........ l-11
Table l-8 Resistance Accuracy Reading Limits (8) for 50mVrms Level ........ l-11

SECTION 3 - Service Information
Table 31 Recommended Line Fuses 3-l
Table Z+2 Self-calibration Errors ........... 3-4
Table 3-3 Operation Check Problem Summary ........... 3-I
Table 3-4 Measurement Signal Problem Summary ............. 3-5
Table 3-5 Model 3321 Replaceable Parts 3-7
Table 3-6 Model 3322 Replaceable Parts ............. 3-7
SECTION 1
Performance Verification

1 .l INTRODUCTION 1.2 INITIALCONDITIONS

The Model 3321/3322 should be huned on and allowed
The procedures outlined in this section may be used to
to warm up for at least one hour before performing the
verify that the Model 3321/3322 LCZ Meter is operating
verification procedures. (The test equipment should also
within limits stated in the specifications. Performance
be allowed to warm up for the time period recommended
verification may be done when the inshlment is first re-
by the manufacturer.) If the instrument has been sub-
ceived to ensure that no damage or misadjustment has jected to extreme temperature or humidity, allow addi-
occurred during shipment. Verification may also be per- tional time for internal circuits to reach normal operating
formed whenever there is a question of instrument accw
temperature. Typically, it takes one additional hour to
racy, if desired. stabilize a unit that is 10