Tektronix 3330 Service Manual

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 our option, either repair or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley representative, or contact Keithley 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 normaI wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTI ES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED 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 INSTRU-

MENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POS-

SIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS
OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAM­AGE TO PROPERTY.

Keithley Instruments, Inc. l 28775 Aurora

CHINA:
FRANCE: Keithley Instruments SARL l BP 60 l 3 All&e des Garays l 91122 Palaiseau (adex * 33-I-60-11-51-55 * Fax: 33-1-60-I l-77-26
GESMANY Keithley Instruments GmbH * Landsberger Strasse 65 l D-821 10 Germering, Munich l 49-89-8493070 l Fax [phone]
GREAT BRITAIN: Keithley Instruments, Ltd. l The Minster l 58 Porunan Road l Reading, Berkshire, England RG3 lE.4 l 44-l 189-596469 l Fax: [phone]
ITALY: Keithley Instruments SRL l Viale S. Gimignano 38 l 20146 Milano * 39-2-48303008 l Fax: 39-z-48302274
NETHERLANDS: Keithley Instruments BV * Avelingen West 49 * 4202 MS Gorinchem * 31-(0)183-635333 l Fax [phone]
SWITZERLAND:
TAIWAN: Keithley Instruments Taiwan l IFI.., 85 PO Ai Street l Hsinchu, Taiwan l 886-3-572-9077 * Fax: [phone]

Keithley Instruments China. Yoan Chen Xin Building, Room 705 * 12Ymnin Road, Dewai, Madian * Beijing 100029~8610-62022886 l Fax: [phone]

Keithley Instruments SA. Kriesbachsuasse 4 l 8600 Diibendorf l 41-I-8219444 *Fax: 41-l-8203081

Road l Cleveland, OH 44139 l 440-248-0400 l Fax: [phone] l http://www.keithley.com

Model 3330 LCZ Meter

Service Manual

01993, Keithley Instruments, Inc.

Test Instrumentation Group

All rights reserved.

Cleveland, Ohio, U.S.A.

First Printing February 1993

Document Number: 3330-902-07 Rev. A

ALI Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered trademarks of their respective holders.

Safety Precautions

The following safety precautions should be observed before using
this product and any associated instrumentation. Although some in­struments and accessories would normally be used with non-haz­ardous voltages, there are situations where hazardous conditions

may be present.

This product is intended for use by qualified personnel who recog-

nize shock hazards and are familiar with the safety precautions re­quired to avoid possible injury. Read the operating information
carefully before using the product.

The types of product users are:

Responsible body

and maintenance of equipment, for ensuring that the equipment is
operated within its specifications and operating limits, and for en-

suring that operators are adequately trained.

Operators

trained in electrical safety procedures and proper use of the instm­ment. They must be protected from electric shock and contact with
hazardous live circuits.

Maintenance personnel

to keep it operating, for example, setting the line voltage or replac­ing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if the operator may per-

form them. Otherwise, they should be performed only by service
personnel.

Service personnel

safe installations and repairs of products. Only properly trained ser­vice personnel may perform installation and service procedures.

is the individual or group responsible for the use

use the product for its intended function. They must be

perform routine procedures on the product

are trained to work on live circuits, and perform

Users of this product must be protected from electric shock at all
times. The responsible body must ensure that users are prevented
access and/or insulated from every connection point. In some cases,
connections must be exposed to potential human contact. Product
users in these circumstances must be trained to protect themselves
from the risk of electric shock. If the circuit is capable of operating
at or above 1000 volts,

exposed.

As described in the International Electrotechnical Commission

(IEC) Standard IEC 664, digital multimeter measuring circuits
(e.g., Keithley Models 175A, 199,2000,2001,2002, and 2010) are
Installation Category II. All other instruments’ signal terminals are
Installation Category I and must not be connected to mains.

Do not connect switching cards directly to unlimited power circuits.
They are intended to be used with impedance limited sources.
NEVER connect switching cards directly to AC mains. When con­necting sources to switching cards, install protective devices to lim-

it fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connect-

ed to a properly grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks
before each use.

For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge

any capacitors before: connecting or disconnecting cables or jump­ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

no conductive part of the circuit may be

Exercise extreme caution when a shock hazard is present. Lethal

voltage may be present on cable connectorjacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak,or60VDC~epresent.Agoodsafetypracticeistoexpect

that hazardous voltage is present in any unknown cir­cuit before measuring.

Do not touch any object that 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 withstanding the voltage being

measured.

The instrument and accessories must be used in accordance with its
specifications and operating instructions or the safety of the equip­ment may be impaired.

The WARNING heading in a manual explains dangers that might
result in personal injury or death. Always read the associated infor­mation very carefully before performing the indicated procedure.

Do not exceed the maximum signal levels of the instruments and ac­cessories, as defined in the specifications and operating informa­tion, and as shown on the instrument or test fixture panels, or

switching card.
When fuses are used in a product, replace with same type and rating

for continued protection against fire hazard.

Chassis connections must only be used as shield connections for

measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is ap-

plied to the device under test. Safe operation requires the use of a

lid interlock.

Ifa@

screw is present, connect it to safety earth ground using the

wire recommended in the user documentation.

The ! a symbol on an instrument indicates that the user should re-

fer to the operating instructions located in the manual.

The A symbol on an instrument shows that it can source or mea-

sure 1000 volts or more, including the combined effect of normal
and common mode voltages. Use standard safety precautions to
avoid personal contact with these voltages.

The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and
all test cables.

To maintain protection from electric shock and fire, replacement
components in mains circuits, including the power transformer, test
leads, and input jacks, must be purchased from Keithley Instru­ments. Standard fuses, with applicable national safety approvals,
may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as
long as they are equivalent to the original component. (Note that se­lected parts should be purchased only through Keithley Instruments
to maintain accuracy and functionality of the product.) If you are

unsure about the applicability of a replacement component, call a
Keithley Instruments office for information.

To clean the instrument, use a damp cloth or mild, water based

cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instrument.

Rev. l/99

HOW TO USE THIS MANUAL

Details procedures to verify that the instrument meets
stated specifications.

r

Describes basic operating principles for the varicws circuits in
the Model 3330.

Covers fuse replacement, calibration and repair of the instru­ment, and lists replacement parts.

WARNING

The information in this manual is intended for qualified serv­ice personnel who can recognize possible shock hazards. Do
not attempt these procedures unless you are qualified to do so.

SECTlON 1

Performance Verification

SECTION 2

Principles of Operation

SECTION 3

Service Information

Table of Contents

SECTION 1

1.1

1.2

1.3

1.4

1.5

1.5.1

1.5.2

1.5.3

1.5.4

15.5

1.5.6

15.7

1.5.8 ExternalDCBiasVoltageRange .................................................

1.6

1.6.1

1.6.2 RecommendedEquipment

1.6.3

1.6.4

1.6.5

1.6.6

- Performance Verification

~ODU~ON

lJ?XIULCONDlTIONS ......................................................... l-l

LINEPOWER
VERIFIcATlONLIMITs

MEASUREMENTSIGNALTESTS .................................................

EnvironmentalConditions
Recommended Test Equipment

FrequencyAccuracy.. ........................................................

Measurement Signal Level Accuracy
Measurement Signal Distortion
OutputImpedanceAc~a~
Internal Bias Voltage Accuracy

MEAsuREMENTACcuRAcyTESTS.. ............................................

EnvironmentiCondiiions

Recommended Standards Accuracy
Resistance Measurement Accuracy

Capa~~ceReadingChecks.......................................-

InductanceReadingChecks ....................................................

..............................................................

.................................................................

.........................................................

.....................................................

..................................................

..............................................

..................................................

....................................................

..................................................

.....................................................

.....................................................

..............................................

...............................................

............

l-l

l-l
l-l
l-2
l-2
l-2
l-3
l-3
l-4
l-4
l-6
1-6
l-7
l-7
l-7
l-7
l-8
l-11
l-11

SECTION 2 - Principles of Operation

2.1

2.2 BLOCKDLAGRAMS

2.3 CURRENT AND VOLTAGE DETECTION

2.4

2.5

2.6 CURRENT-TO-VOLTAGE CONVERTER

2.7

INTRoDucTON......................................-....~.............~

............................................................

lMl?EDANCECALCULATION

O!XlLLATOR

ANALYZER.. ................................................................

...............................................

...................................................

SECTION 3 - Service Information

3.1

3.2

3.2s

32.2'

3.3

3.4

3.5

3.5.1

INTRODUCTION ..............................................................

FUSEREPLA

LineFuse ..................................................................

ExternalBiasFuse......................-

CALIBlUTiON ...............................................................

FANmLTERCLEANING ........................................................

REl?AIR

FactoryService.. ............................................................

CEMENT ..........................................................

.....................................................................

...........................................

............................................

.....................................

. ................

.....

2-l
2-l
2-l
2-l

2-4
2-5
2-5

3-l
3-1
3-1
3-l
3-l
3-2
3-2

3-2

3.5.2

3.5.3 BatteryReplacement ..........................................................

3.5.4 OperationCheckProcedure

3.5.5 RepairS~ary

3.6

3.6.1 PartsList

3.6.2

CoverRemoval............................................................-. 3-2

....................................................

.............................................................

RIZLKEABLEPARTS

..................................................................

OrderingParts

.........................................................

..............................................................

APPENDICES

A specifications

3-2
3-4

3-4
3-5
3-5
3-5

List of Tables

SECTION 1 - Performance Verificatibn

Table l-1
Table l-2 Distortion Measurement Summary
Table l-3
Table l-4 Resistance &Ieasurement Accuracy Reading Limits ( I Z I ) for 1Vrm.s Level
Table l-5 Resistance Measurement Accuracy Reading Limits (9) for 1Vrms Level
Table l-6 Resistance Measurement Accuracy Reading Limits ( I Z I ) for 5OVrms Level
Table l-7

Recommended Test Equipment for Measurement Signal Tests

............................................

Recommended Equipment for Measurement Accuracy Tests

Resistance Measurement Accuracy Reading Limits (0) for 5OVrms Level

........................ l-2

.........................

................. 3-10

................ 3-10

SECTION 3 - Service Information

Table 3-l RecommendedLineFuse
Table 3-2
Table 33
Table 3-4 Measurement Signal Problem Summary

Table 35 Model 3330 Replaceable Parts

Se~-calibrationErr ......................................................

Operation Check Problem Summary

...................................................

...........................................

........................................

................................................

l-4
l-8

............... l-9

.............. 3-10

3-l
3-4

3-4
3-5

3-6

List of Illustrations

SECTION l-

Figure 1-l
Figure l-2 Connections for Frequency Accuracy Measurement
Figure l-3 . Connections for Distortion Measurements
Figure l-4
Figure l-5
Figure l-6

Figure l-7
Figure l-8 Connections for Capacitance and Inductance Reading Checks

Performance Verification

Connections for Measurement and Signal Level Accuracy

.......................................

Connections for Output Impedance Tests
Connections for DC Bias Accuracy Tests
Connections for External DC Bias Voltage Range Test

Connections for Resistance Accuracy Measurements

.......................................

........................................

................................

..............................

...............................

...........................

SECTION 2 - Principles of Operation

Figure 2-l
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2-5

Measuring System Block Diagram

Hardware Block Diagram
Oscillator Block Diagram
Current-to-Voltage Converter
Analyzer

...............................................................

...................................................

.........................................

.............................................

................................................

SECTION 3 - Service Information

Figure 31
Figure 32

CoverRemoval..................................................-........ 3-3

Model 3330 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . _ . . . . . . . .

........................

.........

.,

l-3
l-4
l-5
1-5
l-6
l-7

l-9
l-12

2-2
2-3
24
2-5
2-6

3-7

SECTION 1

Performance Verification

1 .l INTRODUCTION

The procedures outlined in this section may be used to
verifythattheModel333oLcZMeterisoperatingwithin
Emits stated in the specScations. Performance verifica­tion may be done when the instrument is first received to
ensure that no damage or misadjustment has occurred
during shipment. Verification may also be performed
whenever there is a question of instrument accuracy.

NOTE
If instrument performance is outside the
specified range, and the instrument is still un­der warranty, contact your Keithley represen­tative or the factory to determine the correct
course of action.

Performance verification fahs into the foIlowing two gen­eral categories:

1.2 INITIAL CONDITIONS

The Model 3330 should be turned on and allowed to
warm up for at least one-half hour before performing the
verification procedures. (The test equipment should also
beallowedtowarmupforthetimeperiodrecommended
by the manufacturer..) If the instrument has been sub­jected to extreme temperature or humidity, allow addi­tional time for internal circuits to reach normal operating
temperature. Typically, it takes one additional hour to
stabilize a unit that is 10°C (Wl?,I outside the specified
temperature range.

1.3 LINE POWER

Be sure to set the line voltage switch on the rear panel to
the correct line voltage. The instrument should be tested
while operating on a line voltage within +5% of the line
voltage switch setting and at a line frequency from 48Hz
to 62Hz.

1.4 VERIFICATION LIMITS

l

Measurement signal tests (paragraph 1.5)

l

Measurement accuracy and reading checks (para-

graph 1.6)

The performance verification limits stated in this section
reflect only the accuracy specifications of the Model 3330.
They do not include test equipment tolerance.

1-l

SECTION 1
Performance Verification

1.5 MEASUREMENT SIGNAL TESTS

Measurement signal tests measure various characteris­tics of the test signal that is applied to the DTJT. These
tests include:

l Frequency accuracy

. Measurement signal level accuracy

l

Measurement signal distortion

0 Output impedance accuracy

l li&mal

* External DC bias voltage range

Manufacturer Model

Keithley 197A DMM (AC volts,

DC bias voltage accuracy

Table l-l. Recommended Test Equipment for Measurement Signal Tests

Description

DC volts, 5-l /2 digits)

1.51 Environmental Conditions

All measurement signal tests should be performed at an

ambienttemperatureof23”+5”Candatarelativehumid­ity of 50% + 30%.

IS.2 Recommended Test Equipment

Table l-l lists the test equipment required to perform the
measurement signal tests. The procedures for measure­ment signal verification tests are based on using this ex­act equipment. Alternate equipment may be used as long
as ihat equipment has specifications at least good as
those stated in Table l-l.

Specifications

2VDC range; +(O.Oll% of rdg + 2 counts)
2VAC range; z!$O.35% of rdg + 100 counts)

Philips

PM 6654C Timer/counter
PM 9678

Panasonic

Keithley

Keithley

VP-772Z4 Audio analyzer

1681 Test leads

7051-2

Keithley 7754-3
Keithley
Keithley
Pomona

3324
3325
1468

TCXO option

DC power supply

BNC interconnect cable

BNC to alligator cable
Test leads
Test leads
BNC-banana adapter

Capacitor
Resistor
switch

O.OlHz-12OMHz; time base aging
<l x 10-7/month

lOI&-1lOkHz; 0.01% accuracy at full scale; _+ldB har­monic distortion accuracy from lOH2 to 15.99kHz
04OVDC adjustable, <5mVp-p ripple

Two leads terminated with banana plug and clip-on
probes

5OQ coaxial cable (RG58C), male BNC connectors, 2ft.

(0.6m)

Coaxial cable, male BNC connector, two alligator clips

4-terminal alligator clip test lead set

Kelvin clip test lead set

Female BNC connector to double banana plug

lo@?, 1oOVDC
100Q &o-5%, 1/2w
Single-pole, single-throw

l-2

Pt7jinmance Verification

SECTION1

1 s.3 Frequency Accuracy

1. ConnecttheModel333OHCURjacktoinputAofthe
counter/timer, as shown in Figure l-l. Be sure to
co~ect the G terminal of the LCZ meter to the shield
of the connecting cable as shown

2. Set the LCZ meter operating modes as follows:
FREQ: 1kH.z

LEVELZ 1vrms
BIAS: OFF

3. set the counter/timer to measure frequency on in­PUt JJ-

4. Verify that the counter reading is between

0.99995OkHz and 1.00005OkHz &!Spprn~.

1.5.4 Measurement Signal Level
Accuracy

1. Conned the Model 3330 H CUR jack to the DMM, as
shown in Figure l-2. be sure to connect the G termi-

nal of the LCZ meter. to the shield of the connecting
cable as shown.

2. Select the ACV function and auto-ranging on the
DMU

3. Set the LCZ meter operating modes as follows:

LEVEL: 1vrms
FREQ: 1kHz
BLAS: OFF

4. Verify that the DMM reading is between the limits
for lVrms, lkH2 operation, as follows:

0.97vrms to 1.03vrms (23.0%).

5. Change the LEVEL to 5OmVrms, and verify the sig­nal level accuracy for lkHz,5OmVrm.s operation is
as follows:

47.5mVrms to.52.5mVrms (&!S.O%)

Figure z-1.

Model 3330

to cable
shield

Connections

Model 7051-2 Coaxial Cable

for

Measurement and Signal Level Accuracy

l-3

SEcnONl

Pe?yinmance vm.fication

/i I-’

Figure z-2.

Model 3330

*

L

Connect G terminal

to cable shield

Gmnecfionsfar Frequency Accuracy Measurml

/

1

1.55 Measurement Signal Distortion

1. Connect the H CUR jack of the LCZ meter to the dis­tortion meter, as shown in Figure 13. Be sure to con­nect the G terminal of the LCZ meter to the cable
shield as shown.

2.

Set the LCZ meter operating modes as follows:
LEVEL: 1vrms

BIAS OFF

FREQ lkH.2

3.

Verify that the distortion reading is 0.3% or less, as

summarized in Table l-2.

Model 197A DMM

I

Model 7051-2 Coaxial Cable

C. Press the ENTER/EXlT key twice to complete

2ooHz

7.

Verify that the distortion reading is 0.3% or less.

1 S.6 Output Impedance Accuracy

1. Connect the LCZ meter to the DMM, switch, and re­sistor, as shown in Figure l-4. Be sure that the G ter­minal of the LCZ meter is connected to the cable
shield, and that the resistor and switch are connected
as shown.

2. Select the 2VAC

3.

Set the LCZ meter operating modes as follows:

Pomona 1468

programming.

range on the DMM.

Table l-2. Distortion Measurement Summary

Frequency Distortion Reading

4.

Change the frequency to 1OOkHz.

5.

Verify that the distortion reading is 0.5% or less.

6.

Set the Model 3330 frequency to 2OOHz as follows:

A. Press the SETCTP key to enter the auxiliary setup

mode. The LED

blinks, and the unit displays the present fre­quency in them DISPLAY area.

B. Enter a frequency of 2OOHz.

l-4

above the FREQ (HZ) marking

FREQ lkH2

LEVEL 1vrms
BIAS: OFF

4.

Set the switch to the open position, then note the
DMM reading. Call this reading VI.

5. Set the switch to the closed position, then note the
DMM reading. Call this reading Vz.

6. Compute the output impedance

from

VI and Vz as

follows:
zour = 100

Wl/VZ -

1)

IQ1

7. Verify that the output impedance computed in step 6
is between 97S2 and 10322 inclusive (S%).

Model 3339

cable shield

Figure 23. Gmnections jbr Disfortion Measuremenfs

Performance Veri.ficafion

SECTION1

Figure l-4.

Model 1681 Test Leads

R = lOOR, 0.50/o, II2 w

Connecfions for Outpuf Impedance Tests

l-5

SECTION 1
Perjbrmance verifhtion

1.5.7 Internal Bias Voltage Accuracy

1. ConnecttheLumetertotheDMMusingtheModel

3324

cables (see Figure l-5). Note that connections
are intended to measure the voltage between the H
CURandLCURtermmals.

2. Select the 2VDC

3.

Set the LCZ meter operating modes as follows:

IAl DISPLAY: C

LFivELz5omvrms
RANGE: AUTO
BIAS INT/lXTz INT (rear panel switch)

B&e&*- ~~~~~~~~ ~~~~~~~~~~~~ ~~~~~~~~~ ~~~

4.

Verify that the DMM reading is between 1.9V and
21V inclusive (*%I.

5. Set the LCZ meter to BIAS OFF.

6. Select the 2OOmVDC

7.

Verify that the DMM reading is OV flOmV.

1.5.8

External DC Bias Voltage Range

1. Connect the LCZ meter to the DC power supply, ca­pacitor, and DMM, as shown in Figure l-6.

2. Select the DCV function and auto-ranging on the
DMM.

3.

Set LCZ meter operating modes as follows:
m DI!ZLAYz C

FREQ 12oHz

LEYELz!5omvrms

range on the DMM

range on the DMM.

BIAS lNT/EXTz EXT (rear panel switch)
BIAS: OFF

4.

Set the unit to RANGE 2 as follows:

A. Measure the value of the lo@? capacitor in the

RANGE AUTO mode (DC BIAS OFF).

B. Verify that the Model 3330 is properly measur-

ing the capacitor.

C. Press the RANGE/AUTO key, and check that

the AUTO LED goes off. The unit is now set to
RANGE 2.

5. Check the voltage

across

the capacitor with BIAS
OFF,andwithBIASONanda35Vexternalbiasvolt­age SeBingon -the DC ~power 5q?plyWYmust~k
available with BIAS ON).

6. Disconnect the DMM, and measure the capacitor
value. Verify that the reading is stable to within fi
digits of the center value (four digits of span).

WARNING
Hazardous voltage (>3OW will be used in the
following steps. Do not touch the capacitor
until the test is complete, and the capacitor is
discharged.

7.

Set the unit to BIAS OFF, and set the external DC
power supply voltage to +4OV.

8. Set the LCZ meter to BIAS ON, and verify that the
BIAS fuse does not blow.

9.

Set the unit to BIAS OFF, then turn off and discon­nect the external DC power supply.

Figure 1-S.

1-b

Yodel 3330

Model 3324 4-Terminal Test Leads

Model 197A DMM (Measure DCV)

I

Connections fir DC Bias Accuracy Tests

DMM Test Leads

I

-

Black (LCUR)

I

lhdd 3330 Front Panel

S&l

0

0

~

Pomona ’ 1

BNza

Adapter

Figure 1-6. Connections fDf Extemnl DC Bias Voltage Range Test

Model 7051-2 G?a%aI Cable

1 p

Pqbrnzance Vmjbtion

SECl7ON 1

1.6 MEASUREMENT ACCURACY TESTS

Measurement accuracy tests include:

l

R (resistance) measurement accuracy
0 C (capacitance> reading checks
0 L (inductance) reading checks

1.6.1

All resistance measurement accuracy tests should be per­formed at an ambient temperature of 23” f 1°C and at a
relative humidity of 50% rt 20%. Capacitance and induc­tance reading checks can be performed at 23” + 5°C.

1.6.2

Table 1-3&s the resistance standards, capacitors, mduc-

tons, and additional equipment required to perform the
measurement accuracy tests. The procedures for resk­tance measurement accuracy verification tests are based
onusingthese standards. Listed capacitors and inductors

are to be used to perform capacitance and inductance

Environmental Conditions

Recommended Equipment

reading checks that are not based on instrument accuracy

tZp?dfications.

NOTE
The Model 3330 makes all measurements
based on the magnitude and phase of the im­pedance of the DLJT connected to the UN­KNOWN terminals. For that reason, verifica-

tion of resistance measurement accuracy is
sufficient to guarantee the accuracy of capaci­tance and inductance measurements. The re­sistance standards values used are the same as
those used for calibration. Capacitance and in-

ductance reading checks are included to ver­ify that the instrument properly displays ca­pacitance and inductance values.

1.6.3

Resistance standards used for the measurement accuracy
tests should be calibrated at certain interva.ls so as to en­sure the accuracy of standards values. Standards accu­racy tolerances should be added to the stated measure­ment limits.

Resistance Standards Accuracy

l-7

SECTTON 1
Perfomnce Verification

1.6.4

Resistance Measurement
Accuracy

Resistance accuracy measurements are made using the
resistance standards listed in Table 1-3 and the test con­nections shown in Figure l-7.

NOTE

BesuretoconnecttheHandLterminakofthe
resistance standards to the H and L terminals
respectively of the LCZ meter, or inaccurate
measurements may result. Do not handle the
standards excessively, or the resulting tem­perature rise may affect their values.

Procedure:

1. Set the Model 3330 operating modes as follows:

FREQ: 4OHz

LEVEL: 1vIm.s
SPEED: MED
RANGE: AUTO

2 Conned the OPEN resistance standard to the instru-

ment, then press ZERO OPEN. Allow the instrument
to complete the zero cycle before proceeding.

3. Connect the SHORT resistance standard to the in­strument, then press ZERO SHORT. Allow the in­strument to complete the zero cycle before proceed­ing.

4. Connect the lOO!J resistance standard to the instru­ment, and allow the reading to settle.

5. Verify that the I Z I and 0 readings are within the
limits shown in Table l-4 and Table l-5 respectively.

6. Repeat steps 4 and 5 for the remaining standards val­ues listed in the table (1162 through loowZ), and ver­ify that all readings are within the required limits.

7. Repeat steps 2 through 6 for the remaining frequen­cies listed in the tables.

8. Change the LEVEL to 5OmVrms, then repeat steps 2
through 7 for the frequencies summarized in Table

l-6 and Table l-7.

Table l-3. Recommended Equipment for Measurement Accuracy Tests

Description
Resistance standards

Capacitors
Inductors User supplied
Test Fixture*

*Future used to connect capacitors and inductors.

ManufachmrhBodel Values

Hewlett-Packard HP 16074.A
Calibration Standard

User supplied

Keithley 3323

OPEN, SHORT, 1OOQ 1 l&I, 1OkQ lOOw1

lOOpF, O.Oljt.F, kl%
loom, lOmH, z!zl%

l-8

Standard Resistance

Note : Connect L and H terminals properly as shown

Performance Vmficafion

SECTION1

Figure 1-7.

Table 1-4.

Resistance

Standard

Value

100a

1kLl 0.9980 to

lOu2 9.979 to

1ookQ 99.78 to

Connections for Resistance Accuracy Measuremenfs

Resistance Me asurement Accuracy Reading Limits ( 1 Z I 1 for 1Vrms Level

I Z I Reading Limits at Indicat

40

99.80 to

100.209

1.002okQ 1.0013m 1.001m l.OOlOkQ l.oOllkG!

10.021ksz 10.014m lO.Olw2 lO.OlOkQ 10.012kQ

100.~ 100.150ks2 100.12wz 100.100m 100.18kQ

l!ul

!

99.87 to

100.1322

0.9987

9.986 to

99.85 to

so0 lk 1 Sk

I

I

99.89to 99.9Oto
lOOSlS2 100.10Q

to

0.9988 to 0.9990 to

9.988 to 9.990 to

99.88 to 99.90 to

I
.

99.89to

100.1122

0.9989 to

9.988 to

99.82 to

!d Frequen

1Ok

99.87

to

100.13Q

0.9987 to

1.0013m

9.985 to

10.015kQ

’ 99.75to
I 1ooB

!VtHZ)

*

100.17&2 l&.@S2

0.9983 to 0.9960 to

l.cm7kQ 1.004Om

9.980 to

9.960 to

10.020wz 10.04oki2

-

1OOk

99.30 to

100.7m

0.9930 to

1.0070m

’ 98.80 to

101.2okQ

l-9

SEClTONl

Pelyimla?lceVtification

. I

Table l-5.

Resistance

Standard

Value

looi

lK?

lOlc.0

1 loowz

NOTE: M easurements

40 120

o” f 0.12O
0” f 0.12”
o” zk 0.13”
0” f 0.15”

Table 1-6.

Resistance

Standard

Value I-

lCHX2

40

99.70 to

100.3022

Resistance Measurement Accuracy Reading Limits (0) for 1Vrms Level

8 Reading Limik at Indicated Frecwencv (Hz)

soot lk

0” f 0.08”
o” f 0.08”
0” z!z 0.w

0” * 0.10”

should be made at 239tl”C

Resistance

0” f 0.05”
o” f o.c15°
0” f 0.05”
0” f o.cw

-L

Measurement Acwacy Reading L&nib ( 1 Z I) for ~Vz-ms Level

I Z I Reading Limik at Indicated Frequency !I&)

Il.20

99.80 to

100.208

500 lk Sk

99.82

loo.1852

o” * 0.03”
o” f o.c13°
0” f 0.03”
0” f 0.w

to 99.85 to 99.80 to

100.1552

Sk 1Ok 20k 50k

0” f 0.08” 0” + o.lo”
o” f 0.08O o” f 0.10”
00 * 0.06” o” 5 0.08”
0” f 0.08” 0” rt 0.15”

lok

99.77 to

100.2OQ 100.23sz 100.32Q

0” c 0.15” 0” * 0.25”
0” f 0.15” 0” f 0.25”
0” f 0.12” o” + 0.30”
0” f 0.20” 0” rf: 0.40”

20k

99.68 to

5Ok

98.80 to

101.20sz

look

0” i o.50°
o” f 0.50”

0” z!z 0.60”
0” f o.80°

1OOk

98.40 to

101.6oi2

1kQ

1om

lOOk!

NOTE: limits shown do not inchxde resistance standards tolerances- Au measurements to be made at 2391°C

Value

KHZ?

1wZ

lOld2

1OOwZ

0.9970 to

1.0030~

9.963 to

lO.O37k!J

99.55 to

100.45kR

Table 1-7.

40 120 500

0”

Z!I 0.18O
0” + 0.18O
0” z!I 0.23”
0” + 02.P

0.9980 to

1.002oks2

9.975 to

10.02.5k!2

99.70 to 99.80 to

1003OkQ 100.2Oki2 100.16kQ 100.24kQ 100.32k.Q 100.4OkQ 101.8OkQ

Resistance Measurement Accuracy Reading Limits (0) for 5OVrms Level

O” f 0.12” 0’ + 0.09”

O” zk 0.12’ 0” i 0.09”
o” F 0.15” 0” f 0.09”
0” f 0.18” 0” t- 0.12”

0.9982 to

1.0018kQ 1.0015&? 1.002OkQ 1.0023lcCI 1.0032kQ

9.982 to

10.018IcQ 10.016m 10.02OkQ 10.024w2 10.035kQ

0.9985 to 0.9980 to 0.9977 to

9.984 to 9.980 to 9.976 to

99.84 to 99.76 to 99.68

o” 32 0.06”

0” rk 0.06”
0” rtr 0.06”

0” 2 0.12O o”
O” zk 0.12O 0” rfr 0.13”

0” * 0.12” 0” + 0.14O

to 99.60 to 98.20 to

zk 0.13” o” 4 0.180

0.9!%3 to

9.965 to

0” f 0.18”
0” Ik 020”

0.9880 to

1.012om

9.860 to

10.140kQ

0” + o.70°
0” z!z 0.70”

0” rtr 0.80”

0.9840 to

1.016OkR

9.800 to

10.200k!2

97.00 to

103.ooks2

o” 5 1.0”

0” T!I 1.0”
0” It 1.2’

NOTE: Readings should be taken at 239tPC

l-10

Perfomnce Vk$icatibn

SECTION I

1.6.5

Capacitance reading checks are made using the 1OOpF
and O.Olp capacitors summarized in Table l-3.

RocedLuez

1. Set the Model 3330 operating modes as follows:

Capacitance Reading Checks

NOTE

The capacitance reading check procedure is

not based on instrument accuracy specifica­tions and is included only to show that the in­strument properly displays capacitance read­ings. As noted previously, verification of re­sistance measurement accuracy is sufficient to
verify capacitance measurement accuracy.

m DISPLAYC
a DISPLAY: D

CKTMODIZ SEX
FREQ: 1kHz
LEVEL: IVrms
sirEEDzMED
RANGE: AUTO

1.6.6

Inductance reading checks are made using the lOO#I
and 1OmH inductors

Procedure:

1. Set the Model 3330 operating modes as follows:

Inductance Reading Checks

summarized in Table l-3.

NOTE
The inductance reading check procedure is
not based on instrument accuracy specifica­tions and is included only to show that the in­strument properly displays inductance read­ings. As noted previously, verification of re­sistance measurement accuracy is sufficient to
verify inductance measurement accuracy.

m DISPLAY L
m DISPLAY: Q

CKI’ MODE: SER
FREQ 1kHz
LEVEL: mms
!SPEEDMED
RANGE: AUTO

2. Connect the Model 3323 Direct Test Fixture to the
unit (Figure l-81, but do not connect the capacitor to
the test fixture at this time.

3. Short the test fixture terminals by connecting a bare
wire between them. Press ZERO SHORT, and allow
the instrument to complete the zero cycle. Remove
the shorting wire after the zero cycle is completed.

4. Press ZERO OPEN, and allow the instrument to
complete the zero cycle.

5. Connect the lOOpF, kl% capacitor to the test fixture
terminak, and verify that the capacitance reading is
within rt2% of 1OOpF (98pF to 102pFX

6. Connect the O-01@?, +I% capacitor to the test fixture
terminals, and verify that the capacitance reading is
&bi2% of 1OnF (9.8nF to 10.2nF.I.

2. Connect the Model 3323 Direct Test Fixture to the
unit (Figure l-81, but do not connect the inductor to
the test fixture at this time.

3. Short the test fixture terminals by connecting a bare
wire between them. Press ZERO SHORT, and allow
the instrument to complete the zero cycle. Remove
the shorting wire after the zero cycle is completed.

4. Press ZERO OPEN, and allow the instrument to
complete the zero cycle.

5. Connect the lOO$H, Itl% inductor to the test fixture
exminak and verify that the inductance reading is

&thin & of 100~ (98jkH to 102@.

6. Connect the IOmH, kl% inductor to the test fixture

terminals, and verify that the inductance reading is
within 22% of 1OmH (9.8mH to 10.2mH~.

l-11

SECTTOAT 1
PnJimnrmce verifif!ufion

3323 Test Fixture

Figure 1-8. Gmnections fM Cupucitunce and Inducfance Reading Checks

Capacitor or Inductor

l-12

SECTION 2

Principles of Operation

2.1 INTRODUCTION

This section discusses basic circuit operating principles
for the Model 3330 LCZ Meter.

2.2 BLOCK DIAGRAMS

Figure 2-1 shows a block diagram of the measuring sys­tem, and Figure 2-2 is a hardware block diagram.

2.3 CURRENT AND VOLTAGE
DETECTION

The instrument drives the device under test (DUTI with a
signal from the built-in oscillator, and it detects the cur­rent I flowing through the DUT and the voltage
the DUT. The current is converted to a voltage EI by the
operational amplifier and the reference resistor RR.

EV

across

Both AC signals
by the A/D converter. The microprocessor then multi­plies these signals by the reference sine wave and inte­grates the resultant signal digitally to obtain the voltage
and current vectors (magnitude and phase) with respect
to the~referenceoscilktor siQr&Using~th.is method, it is
possible to measure only the fundamental oscillator fre­quency component,
and noise.

EV

and Er are converted into digital data

minimkhg the effects of distortion

2.4 IMPEDANCE CALCULATION

Impedance is calcuked by dividing the voltage vector
by the current vector. As a result, impedance is expressed

as the ratio of the magnitudes and the differences in

phase between the two vectors. Any current-to-voltage

conversion errors are corrected based on factors deter­mined when the instrument is calibrated. In addition,
true impedance (Z=Rs + JX) is obtained by correcting re­sidual impedance Zss and floating admittance YPP, and
the instrument automatically calculates main and auxil­iary parameters from Rs and X.

2-l

SECTION2
Principles

of

Operation

Ev

Display

*

n

GPIB

Figure 2-1.

Measuring System Block Diagmm

2-2

SECTTON

Principles 0fOperafion

-

i Oscillator

$z+
I

- I

!

L

D
Y

I

L POT

I
I

---e-e--

-w--s

r

I
I)

I

S&

a

I

---------1

EXT

----w---

IN

I

Figure 2-2.

.

i
I

I IVDetector

I--------------d

Hardware Block Diagram

i

:.;;::,gg?b

zffrl

Am f

Interface

I

I

1 Power Supply 1

I

I
I

Key Soard
Display

2-3

2.5 OSCILLATOR

Theosciuator~i~e2-3)isadigitaldirectsynthesistn?e
freqyuency synthesizer, which uses a quartz oscillator to
generate the reference frequency. The quark oscihtor is
used to ensure that the synthesizer output remains sta-

ble.

The synthesizer output, which is a digital ramp signal, is

converted into a sine wave by the sine ROM and is then

crystal 4MHz

converted into an analog signal by the D/A converter.

Since the D/A converter output includes harmonics of

the desired fundamental frequency, the D/A converter
output signal is routed through the low-pass filter to ob­tain a pure sine wave.

TheoutputoftheosciUatortifedtotheHCURterxnhlto
be applied to the

DUT

along with the DC bias voltage.

The equivalent output impedance is approximately

lOOS2.

fc

I

Frequency - ) SINE __) D/A - Var- --) An -

Synthesizer - ROM ccnv.

t

l

Frequency

l

Runmop

Phase

- Sampling
Pulse

w Generator

c

Figure 2-3. Oscillafor Block Diagram

-/z/i

1

LPF

-

INT/EXr

Bias Voltage -

GND

11

II

-

SW-

ON/OFF

H CUR (To DUT)

0

z

2-4

Principks

SECTION2

of

Operation

2.6 CURRENT-TO-VOLTAGE
CONVERTER

ThesignalcurrentfromtheDUI’isconvertedtoavoltage
before measurement, a
rent-to-voltage converter (Figure 2-4). The converter is
made up of a high-gain operational amplifier and a refer­ence resistor l&, which forms the feedbackloop for the op

=nP-

Since the operational amplifier has very high gain, its in­verting input is at virtual ground potentiak Conse­quently,thecurrentflowingthroughY~canbeneglected,
and the signal current I has the same magnitude as the
current flowing through RX. As a result, the voltage
across I& which is the same as the output voltage Vour, is
simply Ilk Note that the value of RR can be changed ac­cording to the value of the DUT being measured in order
to increase the dynamic range of the instn.unenL

At higher frequencies, the gain of the operational ampli­fier decreases, and the value of the floating admittance

(which is made up primarily of capacitance at higher frf+

function p&onned

by the cur-

quencies) increases. Consequently, the current to ground
increases substantially, increasing the measurement er­ror. The error term is proportional to the product of RR
and the square of the frequency.

2.7 ANALYZER

To eliminate the effects of a common-mode signal, the

voltages CEv and l3 across theDUT and Rx are amplified

by a differential amplikr and then routed to the A/D

converter through a signal conditioner consisting of am­plifiers and a low-pass filter (Figure 2-5). The low-pass

filter attenuates any unwanted frequency components to

prevent possible measurement errors.

The variable-gain amplifiers (AMI’ xl and AMP xS) are
used to increase the resolution of the X-bit A/D con-

verter when the voltage and current are small. The gain­phase characteristics are measured at power-on and in
zero-measurement (OPEN and SHORT) modes, and the
compensating factors are applied to subsequent imped­ance measurements to ensure that amptier characteris­tics do not affect measurement accuracy.

GND

Figure 2-4. Cumnf-to-Voltage Conv&m

Device under test
Reference resistor

Yp :
OP AMP : Operational amplifier

1 eon, 1 k&2,1 OkQ, 5okQ

Floating admittance

2-5

SECTION2

Principles

of

Operation

Ev

El

Figure 2-S.

e

DiiAMP

*

A?Udyzet

AMP

*

Xl - LPF - S/H - A/D ­X8

fc = 5ookHz

3okHz

To CPU

16Bii

2-6

SECTION 3

Service Information

3.1 lNTRODUCTlON

This section contains information on fuse replacement,

instrument repair, and replacement parts for the Model

3330.

3.2 FUSE REPLACEMENT

The following paragraphs discuss replacement of the line
fuse and external bias fuse.

WARNING

Disconnect the line cord and all other equip-

ment from the instrument

fuses.

CAUTION

Using the wrong fuse type may result in in-

stnunent damage.

3.2.1

The line fuse, which is located on the
the power line input from excessive current. To replace
the fuse, first unplug the line cord, then pry out the fuse
holder from the bottom of the line power receptacle. Re-

Line Fuse

before replacing

rear

panel, protects

place the fuse only with the type recommended in Table

3-l.

.

Table 3-2

Line
Voltage Descrktion I

lO0V/12UV

22OV/24OV

3.2.2

The external bias fuse protects the instrument from ex-

cessive current supplied by an external DC bias source.
To replace this fuse, simply unscrew the fuse holder, then
replace with the following type: O-IA, WOV, fast blow,

5lnmx2t.lnn-t.

External Bias Fuse

Recommended Line Fuses

1/2A, WOV, slow blow, 5mm x 20mm
I/4A, 25OV, slow blow, 5mm x 2Lhnm

3.3 CALIBRATION

Model 3330 &ration requires a special computer pro-

gram, which is included with a calibration kit along with

complete calibration instructions. Calibration kits are

available free of charge from the factory. Please call

‘I-800-552-1115 to obtain your calibration kit.

3-l

SECTION3
Seroice Information

3.4 FAN FILTER CLEANING

The fan filter should be cleaned at least once every three
months whentheunit is operatedina cleanenvironment,
or at least once a month when the unit is operated in a
dirty environment. The fan filter element should be
cleaned as follows:

1. Turn off instrument power, and disconnect the line
cord.

2.

Pry out the filter cover on the rear panel.

3.

Remove the filter element.

4. Soak the filter element in a solution of mild detergent
and water until clean.

5. Rinse the filter element thoroughly in clean water,
then allow the filter to dry thoroughly before re­placement.

6. When the filter has dried completely, install the filter
and cover.

CAUTION

The instrument should not be operated
without the filter in place.

3.5 REPAIR

WARNING
Disconnect the line cord and alI other equip­ment from the Model 3330 before removing
the covers.

CAUTION
A conductive coating is applied to the inner
surfaces of the covers. Be careful not to
scratch the coating when removing covers.
Also be careful not to peel off the plastic film
on the front panel.

Place the instrument upside down on a soft cloth or

I.

rubber mat to avoid scratching the top cover.

2.

Remove the four screws that secure the bottom

cover, then remove the cover.

Place the

3.

Remove the top cover by separating it from the chas-

4.

Sk

instrument right side up.

3.5.3 Battery Replacement

The battery, which backs up setup and calibration con­stants RAM, should last for at least three years. If you no­tice the instrument no longer stores setups, the battery
should be replaced. (A calibration error during the self­test may also indicate a discharged battery.) Follow the
steps below to replace the battery.

3.5.1 Factory Service

.If the Model 3330 is still under warranty, it is recom-

mended that the unit be returned to the factory or a
Keithley authorized repair facility for calibration or re­pair. When returning the unit for service, include the fol-

lowingz

l

Call the Instruments Division Repair Department at
l-800-552-1115 for a Return Material Authorization
0 number.

l

Write the RMA number and the following on the ship-

ping label: ATTENTION REPAIR DEPARTMENT.

l

Complete the service form at the back of this manual.

l

Advise as to the warranty status of the instrument.

3.5.2

The covers must be removed for repair. Follow the steps
below to remove the covers using Figure 3-l as a guide.

Cover Removal

CAUTION

Many parts on the internal circuit boards are
static sensitive. To avoid possible damage,
perform any repair operations only at a
erly grounded work station, and use only
grounded-tip soldering irons and anti-static
de-soldering tools.

prop-

Replacement of lithium batteries is normally a safe proce­dure as long as the following safety precautions are fol­lowed:

WARNING
The precautions below must be followed to
avoid possible personal injury.

1. Wear safety glasses or goggles when
working with lithium batteries.

2 Do not short the battery terminals to-

gether.

3. Do not incinerate or otherwise expose

lithium batteries to excessive heat
(>6OOC).

3-2

SECTIONS

semice Infornzation

Remove

Screw Screw

t t

1. Remove Screws 2. Remove Bottom Cover

Figure 3-Z.

4. Keep lithium batteries away from all

5. Do not attempt to charge lithium batter-

6. Observe proper polarity when install-

covtT~ovu1

_. --

liquids.

ies.
ing lithium batteries.

NOTE

Calibration constants are stored in battery
backed up RAM. Model 3330 calibration will
be required if the battery becomes fully dis-

charged, or if you remove the battery.

1. Disconnect the line cord and all other instruments

from the

Model 3330.

4

t

t

3. Remove Top Cover

Remove

t t

2. Remove the top and bottom covers.

3. Note the positions of the various cables connected to
the circuit board, then discomwct all cables from the

board.

4. Remove the screws that secure the circuit board to
the chassis.

5. Remove the control board.

6. Unsolder the battery terminals, and remove the bat­tery.

7. Install a new battery, taking care to observe polarity.

8. Install the circuit board, and connect all cables to the
board.

9. Replace the covers.

10. Calibrate the instrument after replacing the battery
(see paragraph 3.3).

33

SECTiON
sf??vice Info?Ynation

3.5.4 Operation Check Procedure

1. Connect the instrument to an appropriate power
source using the supplied power cord.

2. Fress in on the front panel POWER switch to turn on
the power.

3. Verify that the instrument displays the ROM version
number on them DISPLAY area.

4. The instrument will then .perform internal circuit
checks and enter the self-calibration mode. During
self-calibration, XAL” is displayed on them DIS-

PLAY, and a decrementing number is displayed on
them DISPLAY section.

5. The number on the m DISPLAY section decre­ments; the self-calibratiofi cycle ends when this

number reaches zero.

Table 3-Z Self-calibration Errors

6. If an error occurs, an appropriate message will be
displayed (see Table 3-2). Turn the instrument off for

three seconds, then turn power back on to see if the
error clears. If the error persists and cannot be
cleared, the instrument requires the indicated serv­ice.

3.5.5

Table 3-3
lem for the various operation check item problems (see
paragraph 3.5.4). Table 3-4 summ
various measurement signal problems. (See Section 1 for
measurement signal measurements.)

Repair Summary

summarizes the most

likely source of the prob-

arizes actions to take for

3-4

Table 3-3. Operation Check Problem Summary

Problem

Non-resettable error (except IEEFE 22222)
Resettable error’

lEFXE22222enor
Calibration error
Front panel keys and/or LEDs do not function
Handler interface does

*If the calibration error persists, the intend battery may r&@re repkement.

not function

Action

Replace RAM, ROM, or circuit board WI?-10420).
Reset error, and proceed with’operation.

Repeat test, calibrate unit if problem persists.*
Replace main board @II?-10420).
Replace front panel circuit board.
Replace handler interface board WI?-21127).

Table 3-4. Measurement Signal Problem Summary

SECTION 3

Senn’ce

Informa fion

Problem
Frequency accuracy
Measurement signal level

Measurement signal distortion

Output impedance accuracy
Internal DC bias accuracy
External DC bias voltage range

3.6 REPLACEABLE PARTS

3.6.1

Table 3-5 summariz

parts, and Figure 3-2 shows the location of mechanical
P*.

Parts List

es available Model 3330 replacement

Action
Replace main board (IQ?-10420).
Perform calibration (replace main

board if calibration is not effective).
Replace main board.
Replace main board.
Replace main board.
Replace main board.

3.6.2

Ordering Parts

To order a part, or to obtain information on replacement

parts, contact your Keithley representative or the factory.
When ordering parts, include the following information:

l

Instrument model number

l

Instrument serial number

l

Keithley part number

l

Part description

3-5

SECTION 3
Semite

Informaiion

Table 3-5. Model 3330 Replaceable Parts

Description

Part Number Quantity

FRONT PANEL SECTION

Fro& panel

400-12310-00
506-005X-00

Power switch (Front)

Button
Switch holder 1

BNC connector (BNC137)

Ground terminal

332-19133-00
359-03554-00
526-12996-00
310-00169-00

330-05346-00

REAR PANEL SrjCTlON

Rear panel

400-12328-00 1

Noise filter (inlet) 240-03212-00 1

Ground terminal 330-05389-00 1
Voltage selection switch 332-50057-00 1
Fan @C12V, 60 x 6Omm)
Air filter

300-00785-00

459-00205-00 1

Flat head screw (M3x4Omm) 600-01241-00 4
Grommet (small) 546-00138-00 1
BNC connector (BNC137) 310-00169-00 1
Fuse holder 302-04045-00 1
Hex. stud (L,=25) 606-00250-00 2

CHASSIS SECTION

1'
1

1
1
4
1

1

ChZiSSiS

Hex. stud (L=8) 606-00080-00

Power switch

516-07107-00 1

6

332-19141-00 1
Switch holder 2 526-13003-00 1
Flexible wire 332-19150-00 1

Power transformer (D: 432768) 244-10870-00 1

BOARD ASSEMBLY

Nr-10457(hMN) 080-33072-00 1
NP-21101A-1 (KEY) 080-33099-00
NP-211OlA-2 (BIAS)
NP-21127 (HANDLER I/F)

* The front panel has two code numbers, and it is necessary to specify these two

numbers when the front panel is ordered.

** These two boards combined into one set.

080-33099-00 l**
080-33510-00 1

1**

3-6

SECZ’TON3

Service Information

Figure 3-2.

Model 3330 Exploded View

3-7

APPENDIX A

Model 3330 Specifications

A.1 MEASUREMENT PARAMETERS

Main Parameters (Display A) and Range

‘L: Inductance, 0.ln.H to 19.999kH
C: Capacitance, O.OOlpF to 19999mF
R: Resiitance, O.lmR to 19.999MR

I Zl : Magnitude of impedance, O.lmR to 19.999Mn

AUTO: Automatically selects main parameters, sub-parameters, and
equivalent circuit.

Sub-parameters (Display B) and Range

Q: Quality factor, 0.0001 to 19999
D: Dissipation factor, 0.0001 to 19999
ESR Equivalent series resistance, O.lmR to 19.999MR

C: Parallel conductance, 0.0Oll1S to 19999S

X: Series reactance, O&n?.2 to 19.999MR

8: Phase angle of impedance, -180.00° to +179.99’
V: Voltage monitor (RMS voltage across device) O.OmV to 1999Vrms
I: Current monitor (RMS current through device), O.OOi.tArms to

19.99mArms

Measurement resolution will vary depending on frequency, measure­ment range, and impedance phase angle.

Automatic Parameter Selection

Phase Display A
+lZO” to +60” L
+30” to -30”

-120” to -60° C
others

R

IZI 0

Display B

Q
Q

D

Autoranging Time: Approximately equal to measurement time
Stabilization Time After Range Change: 0.2 - 4.0s
Stabilization Tie After Frequency Change: 0.15 - 4.0s
Bias Stabilization Tie: (4 + 0.015C)s

where: C = capacitance of DUT (m @)

Equivalent Circuits

AUTO: Automatic selection
SEl? Series
PAR: Parallel

Automatic Equivalent Circuit Selection

Equivalent

Display A

L,C,Ror IZI

LorC(IZI Ilkf2) Q,D,e,VorI
R(620)

IZI Q,D,&VorI series
L,C,Ror IZI G
LorC(IZI >lm) Q,D,e,VorI Parallel
R@<O)

Display B
ESRorX

QD,O,VorI Series

Q,D,e,VorI Parallel

circuit
Series
Series

Parallel

Displayed Resolution

41/2 digits (19999 max counts)

D, Q maximum resolution: 0.0001
0 resolution: 0.01’
V resolution: O.lmV
I resolution:

1pA (when reference resistance is lOOn)

0.1l1A (when reference resistance is 1kR)
O.Ol@ (when reference resistance is 1Okn or 5OkS2)

Deviation Measurement

A: Deviation of main parameter (range of deviation is at least flOO% of
the measurement range)

A% % deviation display of main parameter (display range i199.99%)

Note: Deviation and % deviation of sub-parameters cannot be dis­played.

Execution Times

Measurement Tie m-488)

FAST: 65msec (typ)
MFD: 155msec (typ)
SLOW 485msec (typ)
Note: lkS2 impedance, 1kHz frequency and one shot trigger.

Specifications subject to change without notice.

Note: Reference resistance is measurement range dependent.

Accuracy of V, I

Accuracy of V, I: zk(2% + I Z I accuracy)

Accuracy of I Z I and 0 (1 year 18°-280C)”

For 0.2(1. < I Z I < 2OMR and 0.9-l.lV test level, see Table A-l.
For 0.2D i; I Z I 5 2OMn and 50mV test level, see Table A-2.
For I Z I < 0.252 and 1V test level, see Table A-3.
For I Z I >2OM!G? and 1V test level, see Table A-4.

When properly zero corrected and using Model 3323A test fixture.

Table A-l. Impedance Magnitude Accuracy (%I and Phase Accuracy (“1

Test Level= OSl.lVrms, Speed = Med or Slow

Frequency (Hz)

IZI (RI

10Mr IZI c2OM

SMS IZI <lOM

21111-s IZI c5h4

lIvIs IZI <2M

2OOks IZI <lM

2OkS IZI <2OOk

2kS IZI <2Ok

10s IZI <2k

2s IZI <lO

1s IZI c2 052%

05s IZI <I 1.0%

02s IZI <0.5 21%

40.”

90 l30

43%

2.2s” l.!?

2.2% I 13%

13O 0.90”

1.10% 0.75%

0.68” 0.450

034% 036%

033O 02P

037% 025%

0.22O 0.150

t

0.22% 0.15%

0.15” 0.100

0.21% 0.14%

0.13O 0.09”

0.20% 0.13%

0.12” 0.08”

0.37%
O.ZF 0x9

t

0.33O OXP

0.68” 0.45”

13” 0.90”

I

I

I

I

MO-

3.0%

O.zs%

035%

0.70%

1.4%

MO-

900

05% 03%
030°

030% 0.20%

o.ls” 0.100 0.150

020% 0.15%

0.12” 0.09”

~

0.12% 0.10%

0.06” 0.04O 0.08’

lk

I I

o.20° 030”

I I

l.lk-

5.Ok

05%

030%

0.20%

0.12O

0.18%

5.lk ­1Ok

3.5%
2o”

1.8%

l.1°

0.9%

0.60”

0.40%
o.20°

0.27%

0.16”

023%

0.15”

0.15%

0.08”

0.13%

0.10”

0.32%
o.20°

O.sO%

0.34Y

0.80%
050”

1.2%

0.80”

1.0% 3.5%

0.60” 200 3.0”

O.so%

0300

03.5%
o.20° 0.60”

t

0.70% 1.0% 20%
OAOO 0.60”

1.2% 1.7% 3.3%

0.70” 1.0” 20”

1.6% 3.0%

1.00

1.0% 20%

5.0%

20”

12O

CL0

Notes:

1. For ST-lST, or 28”C-40°C, multiply the I Z I accuracy by 1.4, and the phase accuracy by 1.8.
2 When measurement speed is FAST, multiply the accuracies by 20.

3. For test levels other than 0.9-l.lVrms or 5OmVrm.s see Accuracy Notes.

Table A-2. Impedance Magnitude Accuracy (%I and Phase Accuracy lo)

Level = 5OmVims, Speed = Med

or

Slow

2Ms IZI <5M 3.0% 20%

1MS IZI <ZM 1.5%

ZOOkS IZI <lM 0.75%

2Okr IZI <200k 0.45% 030% 0.20% 0.16%

2kS IZI <2Ok 03%

105 IZI c2k

2s IZI <lO 0.75%

1s IZI <2 1.5%

0.5s IZI <I 27% 1.8%

0.2s IZI co.5 5.55% 3.7% 26% 20%

Notes:

1. For 5”C-18T, or W’C-40°C, multiply the I Z I by 20, and the ph!se accuracy by 20.

2 When measurement speed is fast, multiply the accuracies by 20.

3. Accuracy is not guaranteed in the following ranges: I Z I z= 2OMQ I Z I c 0.252

4. For test ieveis other than O-9-LlVrms or 5OmVnns see Accuracy Notes.

1.80

0.90”

0.45-J

OCP

0.23O 0.156 0.w 0.06”

030% 0.20%

0.18” 0.12O

0.45” 03 o.20°

0.90

1.650 1.10

3.30

1.2O 0.80°

1.0% 0.60%

0.60”

050%

0300 0.25”

O.lV 0.12O

025% 0.18% 0.16%

050%

1.0%

0.600 0.400 o.30°

22” 15” 1-Y

12%

035” 0.w

0.40% 030%

0.18%

0.09”

035%

0.60%

1.2%
o.70°

0.90% 1.2%

0.60°

0.40%

0.18“

0.08” 0.14”

0.15% 020% 0.23%

0.06”

025% 035%

0.140 o.20° 030°

050%

1.0%

0.60° o.70° 0.90” l.1° 6.0”

0.8”

0.60% 0.80%
035O 0.50”

035% 0.40%

0.20” 0.2Y o.40°

024% 0.32%

0.20% 0.24% 0.35% 1.4% 20%

0.12O 0.14”

0.12O 0.13”

050% 0.70%

0.60% 0.80%

o.40°
l.2% 15%

26% 29% 3.4% 21%

1Y 1.7O

1.6% 3.5%
l.o”

0.18O OLD

050”

2o”

1.6%

0.90” 7.0°

0.70% 6.0%

0.40%

OXP om

0.32%

0.18”

0.40”

1.1%

0.70” 3.6” 5.0”

1.8%

20”

25% 30%

150 18”

12%

3.6” 4.0”

1.8%

1.00 Iso

1.2%

0.70” 1.0”

3.4%
20” 23”

6.0% 8.0%

10% 14%

13O 16”

14%

8.0°

7.0%

3.0%

1.2O

1.6%

4.0%

8.5”

28%

Table A-3. Accuracy of I Z I and 0 for I Z I cO.2Q

I Z I Accuracy: z!z(% reading + R) shown.
8 Accuracy: (0 Accuracy for 0.X I Z I co.5 in Table A-l) x (0.2Q/ I Z I )
When SPEED=FAST, multiply accuracy by 2
For 5”-18°C or W-40°C, multiply accuracy by 2

Table A-4. Accuracy of I Z I and 0 for I Z I 220MQ

I Z I Accuracy: Specified by the + deviation (S) of admittance I Y I shown.

6 Accuracy: (e Accuracy for 1Om I Z I <2OM in Table A-l x ( I Z I /2OMQ).
When SPEXD=FAST, multiply accuracy by 2
For 5”-18°C or 28”-4O”C, multiply accuracy by 2

Accuracy Notes

1. When a measurement is made
interaction with line frequency.

2

Tables A-l through A-4show the worst case value in each impedance range. A more precise value for accuracy may be obtained by interpolation.

3.

Inordertodetenninetheimpedancemagnitudeaccuracy(A,)andimpedancephaseaccuracy(Ad) atmeasurementsignallwels (LV) other than5OmV
or 0.9V - l.lV, use one of the following equations:

at line frequency or at twice line frequency, the measured value may deviate beyond the accuracy range due to

. In this case, use 5OI-h or 1OOHz for a 6OHz line and 6OHz or 12OHz for a 5OHz line.

Measurement

Signal Level

0

From To

1OmV 49mV QOMnand ?0.2Q

51mV 899mV

51mV 899mV QOMQand rO.2Q

5lmV 899mV

where:
LV = Test level voltage

= Impedance Magnitude Accuracy (%) from Table A-l

An
A, = Impedance Phase Accuracy (O) from Table A-l

= Impedance Magnitude Accuracy (%) from Table A-2

42
A, = Impedance Phase Accuracy (“) from Table A-2

& = Impedance Magnitude Accuracy (%) from Table A-3
B, = Impedance Magnitude offset @IQ) from Table A-3

A, = Impedance Magnitude Accuracy (96) from Table A-4

A, = Impedance Phase Accuracy (“) from Table A-4

AZ5 = Impedance Magnitude Accuracy for 51mV S LV S 899mV and I Z I c 0.2Q

Measured
Impedance
Magnitude

IZI

22OMQ

corn

Impedance
Magnitude

Accuracy [%I

(4)

Impedance

Phase

Accuracy I”1

(4)

A,(%)

2k !5k

i .;.

; .’

-:.

,’

:*.

, .

: I.,‘! -

\

I

‘. : ,*
r,

s’ i

** :I

;<‘:

:.

*’

;. :

: ,, : *, j

*.* ,:*

I illllil,

‘. ,‘f

a’.

‘.

‘..,’ i _

; *._
it’ =

,*.

i _

‘\ i

‘.i, - \q

: .

: j.

;,* ­2 z

,‘i _

,?. i _

‘-4

; j‘,

10k 2Ok !SOk 1OOk

+

.

inductance L

Impedance t

Frequency f ‘(Hz)

Notes: Use this chart to determine the impedance magnitude of an

inductor or capacitor at a partia~lar frequency. For example,

a 1 H inductor at 1 OkHz and a 1 pF capacitor at 1 kHz are shown

on the diagram.

lH@lOkHz=63kQ

1pF@lkHz=16O~

Figure A-l. Convmion Diagram

Examples of Determining Accuracy

Example 1: Component = 33m resistor

Test Frequency = 1OkHz
Test Level = 1V rms
Temperature = 18’XWC
Speed = Med or Slow

1. Find the accuracy values corresponding to 33m and 1OkHz on Table
A-l. Record the impedance magnitude accuracy (0.25%) and imped­ance phase accuracy (0.15”).

2 If the ambient temperature is 5°C - 18OC or 28°C - 4O”C, multiply the

impedance magnitude accuracy by 1.4 and the impedance phase
accuracy by 1.8.

3. If measurement speed is set to FAST, multiply the impedance magni­tude accuracy by 20 and the impedance phase accuracy by 20.

4. Resistance accuracy is approximately equal to the impedance magni-

tude accuracy if Q s 0.1.

5. If Q > 0.1, see example 4.

Example 2: Component = 1OpF capacitor

Test Frequency = 1kHz
Test Level = 5OmV
Temperature = 18”-WC

Speed = Med or Slow

1. Determine the impedance of the lOt.tF capacitor at 1kHz by referring to
Figure A-l or by solving the following equation:

1

2Rx1kHzx10pF

2 Find the accuracy values corresponding to 16R at 1kHz on Table A-2

Record the impedance magnitude accuracy (0.15%) and impedance
phase accuracy (0.060).

3. If the ambient temperature is 5OC - 18°C or WC - 40°C, multiply the
impedance magnitude accuracy by 1.4 and the impedance phase
accuracy by 1.8.

4. If measurement speed is set to FAST, multiply the impedance magni­tude accuracy by 20 and the impedance phase accuracy by 20.

5. If D s 0.1, the accuracy of the capacitance measurement accuracy (CJ
is related to the impedance magnitude accuracy (ZJ by the followmg
equation:

= 16R

1. Determine the impedance magnitude accuracy of the 68OuH inductor
at 1OOkHz by referring to Figure A-l or by solving the following
equation:

2 Fmdtheaccuracyvaluescorrespondingto427SZatlOOkHzonTableA-

1. Record the impedance magnitude accuracy
phase accuracy (0.5’).

3. If the ambient temperature is 5°C - 18°C or 28°C - 40°C, multiply the
impedance magnitude accuracy by 1.4 and the impedance phase
accuracy by 1.8.

4. If measurement speed is set to FAST, multiply the impedance magni­tude accuracy by 20 and the impedance phase accuracy by 20.

5. If Q > 10 the inductance measurement accuracy is approximately equal
to the impedance magnitude accuracy.

6. If Q < 10, see example 4.

Example 4: Determine precision of parameters other than I Z I and 8 at

any frequency.

1. Fit,

measure I Z

parameters by applying the following equations:
%WM

IZl-

where:

f = frequency (Hz).
C, L,r = series equivalent circuit variables.
Cr, Lp = parallel equivalent circuit variables.

2 Determine the impedance magnitude accuracy (A,) and impedance

phase accuracy (AJ of
table (Table A-l, A-2, A-3 or A-4).

,3. Determine the maximum and minimum value by using the following

equations:
Z-= IZI-x(l+Ar)

z,, = I z

8
e

=arctanQ
=
= i/(2dcs

=27tfr+ine

= sin 0/(2rfCJ

mm=%las+Ae

=emols-Ao

mh

I and 8. Or, calculate them from other measured

Q =1/D

2dr.,+n e

I

lllpu x (I- 4)

sin e)

I ZmLU

= 2xfLJESR
= 1 /(2dCs ESR)
= (2xfC,)/G

= 1/(2~fL,G)

I

and Bmur by referring to the appropriate

(0.70/q)

and impedance

c,r 3%.

l-Zxc

In this example Z- = 0.1% and C, = 0.1001%.

6. If D > 0.1, see example 4.

Example 3: Component = 68OpH

Test Frequency = 1OOkHz
Test Level = 1V rms
Temperature = 18”~WC
Speed = Med or Slow

4. Determine the maximum and minimum value of the parameter of
interest by substituting the values found in step 3 into one of the
following equations. There will be four combinations:

up =

R, =

izic0se

ESR =

IZI case

= izi

sine

; =X/2ltf

= -l/lxfx

cs
Q

=itanei

5. Accuracy is found by determining the largest deviation from the
measured values.

Izihse

G

=c0se/izi

B =sine/IZI

=-1/2&B

L,
c, =B/2xf

D =i/imei

A.2 MEASUREMENT SIGNAL

Frequency

Range:

4oHz-lxxk lOH2 steps
160,200,25OHz
3ooHz-9.9kH.z lOOH steps
lOkI-Iz-1cKkHz 1kI-k steps
Accuracy: fo.O05%

Output Impedance: 100~ (typ)

Signal Level

Range: 1OmV~l.1OOVrms: 1mV steps
AmUacy:
zt(3% + 1mV) for lkH2
jz(4% + 1mV) for 4OHz-2OkHz
z!c(5% + 1mV) for 21kHz-lOOkHa)

Bias Voltage

Internal: 0 or +2VDC (&5%)
Extemal:oto-

(voltage when drive terminal HCUR is open)

Output characteristics:

Type: TTL negative logic
Maximum TTL load: 10 standard TTL
Maximum output current: 48mA (sink, output voltage nV)

Input signals:

TRIG Measurement start trigger (puke width ~lOO.us)
LOCK: Panel operation prohibited

Input characteristics

Low level input voltage: -1.5 to cO.8V
High level input voltage: +2.4V to 30V (TRIG), +3.5V to 30V (LOCK)
Low level input current (Approximation)

TRIG -033mA
LOCK: -3mA

Handler Interface Ground: isolated from chassis ground. Max voltage

from chassis k42VDC.

Beeper (two functions, dip switch selectable):

Beeper on/off: Enables beeper function.
Beeper Mode:

1. Beep oniy for NO GO
2 4KHz beep for GO and 2kHz beep for NO GO.

Note: GOrefers tocomparatorbinsl-19,and NOGOrefers tocompara­tor bin 0.

A.3 COMPARATOR/BINNING FUNCTIONS

Number of bins 20.
The comparator function can sort on the main parameters (It L, C, or Z)

Into bins l-19. Also, the comparator function can sort on the sub-para­meter into bin 0 (Q, D, ESR G or X).

A.4 FRONT PANEL SET-UP MEMORY

Number of front panel set-ups: 10.
Front panel set-up contents: All front panel parameters except bias con-

trol.

Battery Iif? At least 3 years if storage temperhue is less than 4O“C.

A.5 HANDLER INTERFACE

Connector: 36-pin Centronics type (Cinch 5730360)
Output signals:

BIN O-11:
A-NC: Main parameter failure
B-NG: Sub-parameter failure
STROBE:
BUSY:

Bin judgment signals

Judgment completion pulse (pulse width X5ms)
Measurement in progress flag

A.6 IEEE-488 BUS IMPLEMENTATION

Multiline Commands DCL, SDC, GET, GTL, LINT, UNL, SPE, SPD
UniIine Commands: lFC, REN, EOI, SRQ, ATN
Interface Functions: SHl, AI-Ii, T5, L4, SRl, RL2, PPO, DCl, DTI, CO.

A.7 GENERAL

Line Voltage: 100,120,220 or 240510% VAC (external switch selectable)
Bnvimnmenb Operating: 0”-4O”C, lo-90% RI-I (non-condensing)

Storage: -loo-50°C, lo-80% RH (non-condensing)

Dimensions, Weight: 132.5mm high x 216mm wide x 350mm deep (5 ‘/,

in. x 8 Yr in. x 13 ‘/, in.) Net weigth 3.7kg (8.1 Ibs.) (instrument only,

exduding accessories).
Warm-up: 30 minutes.
Front Panel Connectors: 4 BNC connectors and a five way biding post.
Rear Panel Connectors:

Handler Interface

External Bias: BNC

IEEE Connector: Floating
Display: Two 4 ‘/2 digit displays for main and sub-parameters.
Trigger Mode: Automatic (continuous) and manual.
Trigger Delay Time: 0-199.99s

Calibration Cycle: 1 year

lOhmz-

1MQ -z-

looks2 z-

lOks2 :-

lkf27

loon z-

loR?-

8.

c’

(.

*.c’

Y

\ .

‘\

,’

’ ‘.

I’

‘\

‘.

,

,’

‘\

,’

\

,

,’

‘.

,’

.

1R -y

Impedance Z

,

#’

:<

--.

Frequency f (Hz)

Note : 1. For 5%18%, or 28%40%, muifipiy the IZl accuracy by

1.4,andthephaseaccuracyby1.8.

2. When measurement speed is FAST, double the accuracy.

Level 3 0.9%1 .lV rms

Speed E Medium or Slow

lOhK? :-

lMQ~-

loom p-

lOks2 7’

IkQ:-

loof2~-

1on 2-

ia?-

capadtaflce c ’

ImpedanceZ

I ,,,1111, 1 ,I,““,

40

100 200 500 lk 2k

Frequency f (Hz)

Note : 1. For 5%-l 8%, or 28%40°C. multiply the pi accuracy by

2.0,

and the phase accuracy by 2.0.

2. When measurement speed is FAST, double the accuracy.

3.

Accuraoy is not guaranteed in the following ranges : IZl>2OMQ, IZ]c.2Q.

Level = 50mV rms

I I 8 , I II,,

5k 10k 20k

Speed 3~ Medium or slow

. ,

, I I,““,

50k 1OOk

hlduotance L

Index

Analyzer,Z-5 *

B

Battery Replacement, 3-2
Block Diagram, 2-l

C

Cal&ration, 3-l
Capacitance Reading Checks, l-11
Cover Removal 3-2
Current and Voltage l?e&ction, 2-1
Current-to-Voltage Converter, 2-5

E

Environmental Conditions, l-2,1-7
JtkttXdBiiFuse,3-1

ExtemaI DC Bias Voltage Range, I-6

Fan Filter Cleaning, 3-2
Frequency Accuracy, l-3
Fuse Replacement, 3-1

I

Impedance Calculation, 2-1
Inductance Reading Checks, l-11

Inltial Conditions,

Internal Bias Voltage Accuracy, l-6

1-l

L

Line Fuse, 3-l
Line Power, l-1

M

Measurement Accuracy Tests, l-7
Measurement Signal Destination, l-4
Measurement Signal Level Accuracy, 1-3

Measurement SignaI Tests, 1-2

Ordering Parts, 3-5
Oscillator, 2-4
Output Impedance Accuracy, l-4

P

Parts List, 3-5
Performance Verification, l-l
Principles of Operation, 2-l

R

Recommended Equipment, l-7
Recommended Test Equipment, l-2
Repair,3-2
Repair Surnmsq, 3-4
Resistance Standards Accuracy, l-7

S

!kvice Information, 3-l

F

Factory Service, 3-2

0

Operation Check Procedure, 3-4

V

Verification Limits, l-l

SERVICE FORM

Model No.
Name and Telephone No.
colnpany

List all control settings, describe problem

IIlIntermittent

q

DEEE failure

UFront panel operational

Display or output (circle one)

q

Drifts nUnable to zero
nUnstable
ROverload

q

Calibration only
IData required

(attach any additional sheets as necessary.)

DAnalog output follows display q Particular range or function bad; specify

q

0bvious problem on power-up q Batteries and fuses are OK

q

All ranges or functions are bad achecked all cables

q

Will not read applied input

q

Certificate of Calibration required

Serial No.

and check boxes that apply to problem.

Date

Show a block diagram of your measurement system including all instruments connected (whether power is turned on or not).
Also, describe signal source.

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used?
Relative humidity?

Any additional information. (If special modifications have been made by the user, please describe.)

Other?

Ambient Temperature?

OF

Be sure

to

include your name and phone number on this

service

form.

Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44 139

Printed in the U.S.A.