Keithley 2010 Service Manual

Model 2010

Multimeter

Service Manual

Contains Calibrating and Servicing Information

W ARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 3 years 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.

T o e xercise this w arranty, write or call your local K eithley representati v e, or contact K eithle y 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.

LIMIT A TION OF W ARRANTY

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, non­rechargeable 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 PROVIDED HEREIN ARE B UYER’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 SOFTWARE EVEN IF KEITHLEY INSTRU­MENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY 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. • 28775 Aurora Road • Cleveland, OH 44139 • 440-248-0400 • Fax: [phone] • http://www.k eithley.com

BELGIUM: Keithley Instruments B.V. Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02/363 00 40 • Fax: [phone]
CHINA: Keithley Instruments China Y uan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-62022886 • Fax: [phone]
FRANCE: Keithley Instruments Sarl B.P. 60 • 3, allée des Garays • 91122 Palaiseau Cédex • 01 64 53 20 20 • Fax: [phone]
GERMANY: Keithley Instruments GmbH Landsberger Strasse 65 • D-82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Keithley Instruments Ltd The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 0118-9 57 56 66 • Fax: [phone]
INDIA: Keithley Instruments GmbH Flat 2B, WILOCRISSA • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
ITALY: Keithley Instruments s.r.l. Viale S. Gimignano, 38 • 20146 Milano • 02/48 30 30 08 • Fax: [phone]
NETHERLANDS: Keithley Instruments B.V. Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWITZERLAND: Keithley Instruments SA Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: [phone]
TAIWAN: Keithley Instruments Taiwan 1 Fl. 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3572-9077• Fax: [phone]

6/99

Model 2010 Multimeter

Service Manual

©1996, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Third Printing, September 1999

Document Number: 2010-902-01 Rev. C

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created
for this manual. The Revision Le vel letter increases alphabetically as the manual under goes sub­sequent updates. Addenda, which are released between Revisions, contain important change in­formation that the user should incorporate immediately into the manual. Addenda are numbered
sequentially . When a new Re vision is created, all Addenda associated with the previous Re vision
of the manual are incorporated into the new Revision of the manual. Each ne w Revision includes
a revised copy of this print history page.

Revision A (Document Number 2010-902-01)............................................................January 1996

Revision B (Document Number 2010-902-01)................................................................. June 1999

Addendum B (Document Number 2010-902-02).................................................... September 1999

Revision C (Document Number 2010-902-01)....................................................... September 1999

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand 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 v oltages, there
are situations where hazardous conditions may be present.

This product is intended for use by qualified personnel who recognize 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 is the individual or group responsible for the use and maintenance of equipment, for ensuring

that the equipment is operated within its specifications and operating limits, and for ensuring that operators are
adequately trained.

Operators use the product for its intended function. They must be trained in electrical safety procedures and

proper use of the instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel perform routine procedures on the product 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 perform them. Otherwise, they should be performed only by ser­vice personnel.

Service personnel are trained to work on live circuits, and perform safe installations and repairs of products.

Only properly trained service personnel may perform installation and service procedures.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector

jacks 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, or 60VDC are present.

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

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,

of the circuit may be 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 limit fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connected 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 an y capacitors before:
connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

A good safety practice is to

no conductive part

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.

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 applied to the device under test. Safe operation

requires the use of a lid interlock.

If a screw is present, connect it to safety earth ground using the wire recommended in the user documen­tation.

!

The symbol on an instrument indicates that the user should refer to the operating instructions located in
the manual.

The symbol on an instrument shows that it can source or measure 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

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.

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.

T o clean an instrument, use a damp cloth or mild, water based cleaner . Clean the e xterior of the instrument only .
Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that
consist of a circuit board with no case or chassis (e.g., data acquisition board for installation into a computer)
should never require cleaning if handled according to instructions. If the board becomes contaminated and op­eration is affected, the board should be returned to the factory for proper cleaning/servicing.

Rev. 2/99

T able of Contents

1

Performance Verification

Introduction......................................................................................... 1-2

Verification test requirements.............................................................. 1-3

Performing the verification test procedure..........................................1-6

Verifying DC voltage .......................................................................... 1-7

V erifying A C voltage........................................................................... 1-8

Verifying DC current......................................................................... 1-10

V erifying A C current.........................................................................1-11

Verifying resistance........................................................................... 1-12

Verifying temperature ....................................................................... 1-14

Verifying frequency........................................................................... 1-17

Verifying ratio ................................................................................... 1-18

2

Calibration

Introduction......................................................................................... 2-2

Environmental conditions...................................................................2-3

Calibration considerations................................................................... 2-4

Calibration code..................................................................................2-5

Comprehensive calibration..................................................................2-6

Front panel calibration........................................................................2-8

Remote calibration............................................................................2-16

Manufacturing calibration................................................................. 2-24

Routine Maintenance

3

Introduction......................................................................................... 3-2

Setting the line voltage and replacing the line fuse.............................3-2

Replacing the AMPS fuse................................................................... 3-4

T roubleshooting

4

Introduction......................................................................................... 4-2

Repair considerations.......................................................................... 4-2

Power-on self-test................................................................................4-2

Front panel tests..................................................................................4-3

Principles of operation........................................................................4-4

Troubleshooting................................................................................4-10

Analog signal switching states.......................................................... 4-13

No comm link error........................................................................... 4-18

Disassembly

5

Introduction.........................................................................................5-2

Handling and cleaning.........................................................................5-2

Static sensitive devices........................................................................5-3

Assembly drawings .............................................................................5-4

Case cover removal .............................................................................5-5

Changing trigger link lines..................................................................5-6

Motherboard removal..........................................................................5-7

Front panel disassembly......................................................................5-8

Main CPU firmware replacement........................................................5-9

Removing power components...........................................................5-10

Instrument re-assembly .....................................................................5-12

6

Replaceable Parts

Introduction.........................................................................................6-2

Parts lists..............................................................................................6-2

Ordering information...........................................................................6-2

Factory service ....................................................................................6-3

Component layouts..............................................................................6-3

Specifications

A

Accuracy calculations.........................................................................A-7

Calibration Command Reference

B

Introduction........................................................................................B-2

Command summary ........................................................................... B-2

Miscellaneous calibration commands ................................................ B-4

DC calibration commands.................................................................. B-8

AC calibration commands................................................................ B-14

Manufacturing calibration commands.............................................. B-16

Remote error reporting..................................................................... B-18

Detecting calibration step completion.............................................. B-21

Calibration Program

C

Introduction........................................................................................C-2

Computer hardware requirements...................................................... C-2

Software requirements........................................................................ C-2

Calibration equipment........................................................................ C-3

General program instructions............................................................. C-3

List of Illustrations

1

Performance Verification

Connections for DC volts verification.................................................1-7

Connections for AC volts verification................................................. 1-8

Connections for DC current verification........................................... 1-10

Connections for AC current verification...........................................1-11

Connections for resistance verification (10 Ω -10M Ω ranges)........... 1-12

Connections for resistance verification (100M Ω range)................... 1-13

Connections for frequency verification.............................................1-17

Verifying ratio ................................................................................... 1-18

2

Calibration

Low-thermal short connections........................................................... 2-9

Calibrator connections for DC volts and ohms portion

of comprehensive calibration........................................................ 2-10

Connections for DC and AC amps comprehensive calibration......... 2-12

Connections for AC volts calibration................................................ 2-13

Synthesizer connections for manufacturing calibration....................2-25

Routine Maintenance

3

Power module......................................................................................3-3

T roubleshooting

4

Power supply block diagram............................................................... 4-5

Digital circuitry block diagram........................................................... 4-7

Analog circuitry block diagram .......................................................... 4-8

5

Disassembly

Trigger link connectors.......................................................................5-6

List of T ables

1

Performance Verification

Recommended verification equipment................................................1-4

DCV reading limits .............................................................................1-7

ACV reading limits..............................................................................1-9

DCI limits..........................................................................................1-10

ACI limits..........................................................................................1-11

Limits for resistance verification.......................................................1-13

Thermocouple temperature verification reading limits.....................1-15

Four-wire RTD temperature verification reading limits....................1-16

2

Calibration

Recommended equipment for comprehensive, DC-only,

or AC-only calibration......................................................................2-6

Comprehensive calibration procedures...............................................2-8

DC volts calibration summary...........................................................2-11

Ohms calibration summary ...............................................................2-11

DC current calibration summary.......................................................2-12

AC voltage calibration summary.......................................................2-13

AC current calibration summary.......................................................2-14

DC voltage calibration programming steps.......................................2-18

Resistance calibration programming steps........................................2-19

DC current calibration programming steps.......................................2-20

AC voltage calibration programming steps.......................................2-21

AC current calibration programming steps.......................................2-22

Recommended equipment for manufacturing calibration.................2-24

3

Routine Maintenance

Power line fuse....................................................................................3-3

4

T roubleshooting

Power supply components...................................................................4-4

Display board checks ........................................................................ 4-10

Power supply checks.........................................................................4-11

Digital circuitry checks .....................................................................4-12

DCV signal switching .......................................................................4-13

ACV and FREQ signal switching......................................................4-13

Ω

2 signal switching...........................................................................4-14

Ω 4 signal switching...........................................................................4-14

2/ Ω 4 reference switching...............................................................4-15

Ω

DCA signal switching .......................................................................4-15

ACA signal switching........................................................................4-15

DCV signal multiplexing and gain....................................................4-16

ACV and ACA signal multiplexing and gain.....................................4-16

DCA signal multiplexing and gain....................................................4-16

Ω 2 signal multiplexing and gain........................................................4-17

Ω 4 signal multiplexing and gain........................................................4-17

Circuit section locations for switching devices.................................4-17

6

Replaceable Parts

Mother board parts list.........................................................................6-4

Display board parts list......................................................................6-11

Connector board parts list..................................................................6-11

Mechanical parts list..........................................................................6-12

B

Calibration Command Reference

Remote calibration command summary.............................................B-2

DC calibration commands ..................................................................B-8

AC calibration commands ................................................................B-14

Calibration error summary................................................................B-18

1

Performance

V erification

1-2 Performance Verification

Introduction

Use the procedures in this section to verify that the Model 2010 Multimeter accuracy is within
the limits stated in the instrument’s one-year accuracy specifications. You can perform verifica­tion procedures:

• When you first receive the instrument to make sure that it w as not damaged during ship­ment, and that the unit meets factory specifications.

• If the instrument’s accuracy is questionable.

• Following calibration.

WARNING The information in this section is intended only for qualified service person-

nel. Do not attempt these procedures unless you are qualified to do so.

NOTE

If the instrument is still under warranty and its performance is outside specified lim­its, contact your Keithle y repr esentative or the factory to determine the corr ect course
of action.

Performance Verification 1-3

V erification test requirements

Be sure that you perform the verification tests:

• Under the proper environmental conditions.

• After the specified warm-up period.

• Using the correct line voltage.

• Using the proper calibration equipment.

• Using the specified reading limits.

Environmental conditions

Conduct your performance verification procedures in a test environment that has:

• An ambient temperature of 18-28°C (65-82°F).

• A relative humidity of less than 80% unless otherwise noted.

W arm-up period

Allow the Model 2010 Multimeter to warm up for at least two hours before conducting the

verification procedures.

If the instrument has been subjected to temperature extremes (those outside the ranges stated
above), allow additional time for the instrument’s internal temperature to stabilize. T ypically , al­low one extra hour to stabilize a unit that is 10°C (18°F) outside the specifi ed temperature range.

Also, allow the test equipment to warm up for the minimum time specified by the manufac­turer.

Line power

The Model 2010 Multimeter requires a line voltage of 100V/120V/220V/240V, ±10% and a
line frequency of 45Hz to 66Hz and 360Hz to 440Hz.

1-4 Performance Verification

Recommended test equipment

Table 1-1 summarizes recommended verification equipment. Use the Fluke Model 5700A
Calibrator (or the equivalent) to v erify Model 2010 Multimeter measurement accurac y. You can
use alternate equipment as long as that equipment has specifications at least as good as those
listed in T able 1-1. K eep in mind, ho wev er , that the calibrator will add to the uncertainty of each
measurement. Table 1-1 lists the uncertainties of the recommended Fluke 5700A at each source
value.

Table 1-1

Recommended verification equipment

Fluke 5700A Calibrator:

DC voltage

100mV:±14ppm

1.0V:±7ppm
10V:±5ppm
100V:±7ppm
1000V:±9ppm

Fluke 5725A Amplifier:

AC Voltage, 50kHz: 700V, ±375ppm

Keithley 3930A or 3940 Frequency Synthesizer:

1V RMS, 1kHz, ±5ppm

General Radio 1433-T Precision Decade Resistance Box:

10 Ω -400 Ω , ±0.02%

*1kHz specifications shown. 5725A amplifier required to source 700V at 50kHz.

NOTE: The Fluke 5725A amplifier is necessary only if you wish to verify the 750V AC range at 50kHz. Verifi­cation at 220V, 50kHz using only the 5700A calibrator is adequate for most applications.

AC voltage

(1kHz, 50kHz)*

100mV:±200ppm

1.0V:±82ppm
10V:±82ppm
100V:±90ppm
700V:±85ppm

DC current

10mA:±60ppm
100mA:±70ppm
1A:±110ppm

2.2A:±94ppm

AC current

(1kHz)

1A:±690ppm

2.2A:±682ppm

Resistance

10

Ω :±28ppm

100

Ω :±17ppm

1k

Ω :±12ppm

10k

Ω :±11ppm

100k

Ω :±13ppm

1M

Ω :±18ppm

10M

Ω :±37ppm

100M

Ω :±120ppm

V erification limits

The verification limits stated in this section have been calculated using only the Model 2010
one-year accuracy specifications. All ranges do not include the verification equipment’s uncer­tainty. If a particular measurement falls slightly outside the allowable range, recalculate new
limits based on both Model 2010 specifications and pertinent calibration equipment specifica­tions.

Example reading limit calculation

The following is an example of how reading limits have been calculated:

Assume you are testing the 10V DC range using a 10V input value. Using the Model 2010
one-year accuracy specification for 10V DC of ± (24ppm of reading + 4ppm of range), the cal­culated limits are:

Performance Verification 1-5

Reading limits = 10V ± [(10V

Reading limits = 10V ± (.00024 + .00004)

Reading limits = 10V ± .00028V

Reading limits = 9.99972V to 10.00028V

Calculating resistance reading limits

Resistance reading limits must be recalculated based on the actual calibration resistance val­ues supplied by the equipment manufacturer . Calculations are performed in the same manner as
shown in the preceding example, except you should use the actual calibration resistance values
instead of the nominal values when performing your calculations.

Restoring factory defaults

Before performing the verification procedures, restore the instrument to its factory defaults
as follows:

1. Press SHIFT and then SETUP. The instrument will display the following prompt:
RESTORE: FACT

NOTE Pressing either range key toggles the RESTORE selection between USER and FACT.

2. Select FACT, and then restore the factory default conditions by pressing ENTER.

3. Factory defaults will be set as follows:
Speed: medium

Filter: 10 readings

× 24ppm) + (10V × 4ppm)]

1-6 Performance Verification

Performing the verification test procedures

T est summary

Verification test procedures include:

• DC volts

• AC volts

• DC current

• AC current

• Resistance

• Temperature

• Frequency

• Ratio

If the Model 2010 is not within specifications and not under warranty , see the calibration pro-

cedures in Section 2.

T est considerations

When performing the verification procedures:

• Be sure to restore factory defaults as outlined above.

• Restore factory defaults and choose the measurement function to be tested.

• Make sure that the equipment is properly warmed up and connected to the front panel
input jacks. Also mak e sure that the front panel input jacks are selected with the INPUTS
switch.

• Do not use autoranging for any verification tests because autorange hysteresis may cause
the Model 2010 to be on an incorrect range. For each test signal, you must manually set
the correct range for the Model 2010 using the range keys.

• Make sure the calibrator is in operate before you verify each measurement.

• Always let the source signal settle before taking a reading.

• Do not connect test equipment to the Model 2010 through a scanner or other switching
equipment.

W ARNING The maximum common-mode voltage (voltage between INPUT LO and chas-

sis ground) is 500V peak. Exceeding this value may cause a breakdown in in­sulation, creating a shock hazard. Some of the procedures in this section may
expose you to dangerous voltages. Use standard safety precautions when
such dangerous voltages are encountered to avoid personal injury caused by
electric shock.

V erifying DC voltage

Check DC voltage accuracy by applying accurate v oltages from the DC v oltage calibrator to
the Model 2010 INPUT jacks and verifying that the displayed readings fall within specified lim­its. Follow these steps to verify the DC voltage:

CAUTION Do not exceed 1000V peak between INPUT HI and INPUT LO because in-

strument damage may occur.

1. Connect the Model 2010 HI and LO INPUT jacks to the DC voltage calibrator as sho wn
in Figure 1-1.

NOTE Use shielded, low-thermal connections when testing the 100mV and 1V ranges to

avoid errors caused by noise or thermal ef fects. Connect the shield to the calibr ator’s
output LO terminal.

Performance Verification 1-7

Figure 1-1

Connections for
DC volts verifica­tion

5700A Calibrator (Output DC Voltage)

Model 2010

2000 MULTIMETER

Input HI

Output HI

!

R

Input
LO

Output
LO

Note : Use shielded, low-thermal cables
for 100mV and 1V ranges.

2. Select the DC volts function by pressing the DCV key, and set the Model 2010 to the
100mV range.

3. Set the calibrator output to 0.00000mV DC, and allow the reading to settle.

4. Enable the Model 2010 REL mode. Leave REL enabled for the remainder of the DC
volts verification tests.

5. Source positive and negative full-scale voltages for each of the ranges listed in Table 1-

2. For each voltage setting, be sure that the reading is within stated limits.

Table 1-2

DCV reading limits

Range

100mV

1V

10V

100V

1000V

* Source positive and negative values for each range.

Applied DC

voltage*

100.0000mV

1.000000V

10.00000V

100.0000V

1000.000V

Reading limits

(1 year, 18°C–28°C)

99.99540 to 100.00460mV

0.9999730 to 1.0000270V

9.999720 to 10.000280V

99.99600 to 100.00400V

999.9530 to 1000.0470V

1-8 Performance Verification

V erifying AC voltage

Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from
the A C v oltage calibrator to the Model 2010 inputs and verifying that the displayed readings f all
within specified ranges.

Figure 1-2

Connections for
AC volts verifica­tion

CAUTION Do not exceed 1000V peak between INPUT HI and INPUT LO, or 8

V•Hz input, because instrument damage may occur.

Follow these steps to verify AC voltage accuracy:

1. Connect the Model 2010 HI and LO INPUT jacks to the A C voltage calibrator as sho wn
in Figure 1-2.

5725 Amplifier (Connect to calibrator)

Note: 5725 Amplifier required only
for 700V, 50kHz output.

Model 2010

2000 MULTIMETER

Input HI

Output HI

!

R

Input
LO

Shielded cable

Output
LO

5700A Calibrator (Output AC Voltage)

2. Select the AC volts function by pressing the ACV key.

3. Set the Model 2010 for the 100mV range; make sure that REL is disabled.

4. Source 1kHz and 50kHz AC voltages for each of the ranges summarized in Table 1-3,
and make sure that the respective Model 2010 readings fall within stated limits.

7

×

10

Table 1-3

ACV reading limits

Performance Verification 1-9

ACV

range

Applied

AC voltage

(1 year, 18°C–28°C)

1kHz 50kHz

Reading limits

100mV

1V

10V
100V
750V

*If the 5725A amplifier is not available, change the 700V at 50kHz step to 220V at 50kHz.

(Reading limits for 220V at 50kHz = 219.361 to 220.639V).

100.0000mV

1.000000V

10.00000V

100.0000V

700.000V*

99.910 to 100.090mV

0.99910 to 1.00090V

9.9910 to 10.0090V

99.910 to 100.090V

699.36 to 700.64V

99.830 to 100.170mV

0.99830 to 1.00170V

9.98300 to 10.0170V

99.830 to 100.170V

698.79 to 701.21V

1-10 Performance Verification

V erifying DC current

Check DC current accuracy by applying accurate DC currents from the DC current calibrator
to the AMPS input of the Model 2010 and v erifying that the displayed readings f all within spec­ified limits. Follow these steps to verify DC current accuracy:

1. Connect the Model 2010 AMPS and INPUT LO jacks to the calibrator as shown in Fig­ure 1-3.

2. Select the DC current measurement function by pressing the DCI key.

3. Set the Model 2010 for the 10mA range.

4. Source positive and negati v e full-scale currents for each of the ranges listed in Table 1-4,
and verify that the readings for each range are within stated limits.

Figure 1-3

Connections for
DC current verifi­cation

5700A Calibrator (Output DC Current)

Model 2010

2000 MULTIMETER

Input
LO

Output HI

!

R

Amps

Output
LO

Note: Be sure calibrator is set for

normal current output.

Table 1-4

DCI limits

DCI
range

10mA

100mA

1A
3A

*Source positive and negative currents with values shown.

Applied DC

current*

10.0000mA

100.0000mA

1.000000A

2.20000A

Reading limits

(1 year, 18°C–28°C)

9.994600 to 10.005400mA

99.94600 to 100.05400mA

0.9991600 to 1.0008400A

2.197315 to 2.202685A

V erifying AC current

Check A C current accurac y by applying accurate AC current at specific frequencies from the
AC current calibrator to the Model 2010 input and verifying that the displayed readings fall
within specified limits. Follow these steps to verify AC current:

1. Connect the Model 2010 AMPS and INPUT LO jacks to the calibrator as shown in Fig­ure 1-4.

2. Select the AC current function by pressing the ACI key.

3. Set the Model 2010 for the 1A range.

4. Source 1A and 2.2A, 1kHz full-scale AC currents as summarized in T able 1-5, and verify
that the readings are within stated limits.

Performance Verification 1-11

Figure 1-4

Connections for
AC current verifi­cation

Model 2010

Table 1-5

ACI limits

ACI

range

1A
3A

!

2000 MULTIMETER

R

Amps

Applied DC

voltage

1.000000A

2.20000A

Output HI

Input
LO

Output
LO

5700A Calibrator (Output AC Current)

Reading limits

(1 year, 18°C–28°C) 1kHz

0.99860 to 1.00140A

2.1949 to 2.2051A

1-12 Performance Verification

V erifying resistance

Check resistance by connecting accurate resistance values to the Model 2010 and verifying

that its resistance readings are within the specified limits.

CAUTION Do not apply more 1000V peak between INPUT HI and LO or more than

350V peak between SENSE HI and LO, or instrument damage could occur.

Follow these steps to verify resistance accuracy:

1. Using shielded 4-wire connections, connect the Model 2010 INPUT and SENSE jacks
to the calibrator as shown in Figure 1-5.

Figure 1-5

Connections for
resistance verifi-

Ω

cation (10

-

10MΩ ranges)

5700A Calibrator

Sense LO

Model 2010

2000 MULTIMETER

Sense LO

Sense HI

!

R

Sense HI

Input
HI

Output
HI

InputLOOutput

LO

Note : Use shielded low-thermal cables to
minimize noise. Enable or disable
calibrator external sense as indicated
in procedure.

2. Set the calibrator for 4-wire resistance with external sense on.

3. Select the Model 2010 4-wire resistance function by pressing the

4. Set the Model 2010 for the 10
calibrator output to 0

Ω , then enable Model 2010 REL.

Ω range, and make sure the FILTER is on. Set the

Ω 4 key.

5. Recalculate reading limits based on actual calibrator resistance values.

6. Source the nominal full-scale resistance values for the 10

Ω -10M Ω ranges summarized

in Table 1-6, and verify that the readings are within calculated limits.

7. Connect the Model 2010 INPUT and SENSE jacks to the calibrator as shown in Figure
1-6.

8. Disable external sense on the calibrator.

9. Set the Model 2010 for the 100M

10. Source a nominal 100M
lated limits for the 100M

Ω resistance value, and verify that the reading is within calcu-

Ω range.

Ω range.

Table 1-6

Limits for resistance verification

Nominal

Ω range

applied

resistance

Nominal reading limits

Performance Verification 1-13

(1 year, 18°C–28°C) Recalculated limits*

10 Ω

100 Ω

1k Ω

10k Ω

100k Ω

1M Ω

10M Ω

100M Ω

* See verification limits.

Figure 1-6

Connections for
resistance verifi-

Ω

cation (100M
range)

10 Ω

100 Ω

1k Ω

10k Ω

100k Ω

1MΩ

10MΩ

100MΩ

9.999310 to 10.000690Ω

99.99390 to 100.00610Ω

0.9999480 to 1.0000520kΩ

9.999480 to 10.000520kΩ

99.99080 to 100.00920kΩ

0.9999260 to 1.0000740MΩ

9.995960 to 10.004040MΩ

99.84960 to 100.15040MΩ

Sense HI

Model 2010

2000 MULTIMETER

Sense LO

!

R

Input
HI

InputLOOutput

______________to_____________ Ω
______________to_____________ Ω
______________to_____________ kΩ
______________to_____________ kΩ
______________to_____________ kΩ
______________to_____________ MΩ
______________to_____________ MΩ
______________to_____________ MΩ

5700A Calibrator (Output 2-wire Resistance)

Output
HI

LO

Note : Use shielded cables to minimize noise.
Disable calibrator external sense mode.

1-14 Performance Verification

V erifying temperature

Thermocouple and RTD temperature readings are derived from DC volts and ohms readings
respectively. For this reason, it is not necessary to independently verify the accuracy of temper­ature measurements. As long as the DC v olts and ohms functions meet or exceed their respecti ve
specifications, temperature function accuracy is automatically verified. However, temperature
verification procedures are provided belo w for those who wish to separately v erify temperature
accuracy.

Thermocouple temperature

1. Connect the DC voltage calibrator output terminals to the Model 2010 INPUT jacks us­ing low-thermal shielded connections. (Use 2-wire connections similar to those shown
in Figure 1-1.)

2. Configure the Model 2010 for °C units, type J temperature sensor, and 0°C simulated ref­erence junction as follows:
A. Press SHIFT then SENSOR, and note the unit displays the temperature units:

UNITS: C. (If necessary, use the cursor and range keys to select °C units.)

B. Press ENTER, and note the unit displays the sensor type: SENS: TCOUPLE. (Use

the cursor and range keys to select a thermocouple type temperature sensor.)
C. Press ENTER. The unit then displays the thermocouple type: TYPE: J.
D. Select a type J temperature sensor, and then press ENTER. The unit displays the ref-

erence junction type: JUNC: SIM.
E. Make sure the simulated reference junction type is selected, and then press ENTER.

The unit displays the current simulated reference junction temperature: SIM: 023.
F . Using the cursor and range keys, set the reference junction temperature to 0°C, and

then press ENTER to complete the temperature configuration process.

Performance Verification 1-15

3. Select the temperature function by pressing the TEMP key.

4. Source each of the voltages summarized in Table 1-7, and verify that the temperature
readings are within limits. Be sure to select the appropriate thermocouple type for each
group of readings. (See step 2.)

Table 1-7

Thermocouple temperature verification reading limits

Thermocouple

type

J

K

* Voltages shown are based on ITS-90 standard using 0°C reference

junction temperature. See text for procedure to set reference junction
temperature.

Applied DC

voltage*

-7.659mV
0mV

42.281mV

-5.730mV
0mV

54.138mV

Reading limits

(1 year, 18°C–28°C)

-190.60 to -189.40°C

-0.50 to +0.50°C

749.50 to 750.50°C

-190.60 to -189.40°C

-0.50 to +0.50°C

1349.20 to 1350.80°C

1-16 Performance Verification

RTD temperature

1. Connect the precision decade resistance box (listed in Table 1-1) to the Model 2010
INPUT and SENSE jacks using 4-wire connections. (See Figure 1-1 for a similar
connecting scheme.)

2. Configure the Model 2010 temperature function for °C units and RTD temperature sen­sor (α=0.00385) as follows:
A. Press SHIFT then SENSOR, and note the unit displays the temperature units:

UNITS: C.
B. Press ENTER, and note the unit displays the sensor type: SENS: TCOUPLE.
C. Using the cursor and range keys, set the display as follows: SENS: 4W-RTD.
D. Press ENTER, and note the unit displays: TYPE: PT100.
E. Using the cursor and range keys, set the unit for the following display: TYPE:

PT385.
F. Press ENTER to complete the temperature configuration process.

3. Select the temperature function by pressing the TEMP key.

4. Set the decade resistance box to each of the values shown in Table 1-8, and verify that
the temperature readings are within the required limits.

Table 1-8

Four-wire RTD temperature verification reading limits

Applied
resistance*

22.80Ω

100.00Ω

313.59Ω

* Based on a = 0.00385. See text.

Reading limits (°C)

(1 year, 18°C–28°C)

-190.14 to -189.86°C

-0.08 to +0.08°C

599.86 to 600.14°C

V erifying frequency

Follow the steps below to verify the Model 2010 frequency function.

1. Connect the frequency synthesizer to the Model 2010 INPUT jacks. See Figure 1-7.

2. Set the synthesizer to output a 1kHz, 1V RMS sine wave.

3. Select the Model 2010 frequency function by pressing the FREQ key.

4. Verify that the Model 2010 frequency reading is between 999.9000Hz and 1.000100kHz.

Performance Verification 1-17

Figure 1-7

Connections for
frequency verifi­cation

Model 2010

2000 MULTIMETER

!

R

BNC-to-Dual

Banana Plug

Adapter

50Ω BNC Coaxial Cable

Model 3930A or 3940 Synthesizer

Main

Function

Output

1-18 Performance Verification

V erifying ratio

CAUTION When verifying ratio or using sense volts, the SENSE LO terminal must be

1. Connect SENSE HI to INPUT HI, and connect SENSE LO to INPUT LO.

2. Connect the DC calibrator output HI and LO terminals to the Model 2010 HI and LO
terminals respectively, as shown in Figure 1-8.

3. Select the Model 2010 DCV function, and select the 1V range.

4. Set the DC calibrator output to +1.000000V DC, and turn on its output.

5. Press SHIFT then RATIO, then select and enable both RATIO:ON and SENSEIN:ON.

6. Verify that the ratio reading is between 0.9999460 and 1.0000540.

referenced to INPUT LO. Exceeding 350V DC from SENSE HI to SENSE
LO will cause instrument damage.

Figure 1-8

Verifying ratio

STEP CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10
TALK
LSTN
SRQ
SHIFT
TIMER

HOLD TRIG FAST MED SLOW AUTO ERR

MX+B

SHIFT

DCV

LOCAL

EX TRIG

POWER

SAVE SETUP

OPEN CLOSE

Model 2010

CH1REM

SCAN

REL FILT

dBm

%

dB

ACI

ACV

DCI

HOLD

LIMITS ON/OFFDELAY

TRIG

STORE

RECALL

CONFIG HALT

STEP SCAN

CONT

DIGITS RATE

Ω2 Ω4

TYPE

GPIB

BUFFER

RATIO

RELFILTER

RS232

SENSE HI

MATH
REAR

4W

STAT

2010 MULTIMETER

PERIOD SENSOR

FREQ

TEMP

DRYCKT O COMP

CAL TEST

EXIT ENTER

Model 5700A

HI

SENSE

INPUT

Ω 4 WIRE

HI

350V

1000V

!

PEAK

PEAK

LO

500V
PEAK

INPUTS

F

R

RANGE

AUTO

FRONT/REAR

3A 250V

AMPS

RANGE

Short SENSE HI to INPUT HI
Short SENSE LO to INPUT LO

LOSENSE LO

2

Calibration

2-2 Calibration

Introduction

Use the procedures in this section to calibrate the Model 2010. Calibration procedures in-

clude:

• Comprehensive calibration: calibrate DC and AC voltages, DC and AC currents, and re­sistance values.

• Manufacturing calibration: usually only performed at the factory

WARNING The information in this section is intended for qualified service personnel

only. Do not attempt these procedures unless you are qualified to do so.

All the procedures require accurate calibration equipment to supply precise DC and AC volt­ages, DC and A C currents, and resistance v alues. Comprehensi v e A C and DC calibration can be
performed any time by an operator either from the front panel, or by using the SCPI commands
sent either over the IEEE-488 bus or the RS-232 port. DC-only and AC-only calibration may be
performed individually, if desired.

NOTE Manufacturing calibration is normally requir ed in the field only if the Model 2010 has

been repaired.

Calibration 2-3

Environmental conditions

Conduct the calibration procedures in a location that has:

• An ambient temperature of 18-28°C (65-82°F)

• A relative humidity of less than 80% unless otherwise noted

W arm-up period

Allow the Model 2010 Multimeter to warm up for at least tw o hours before performing cali-

bration.

If the instrument has been subjected to temperature extremes (those outside the ranges stated
in the above section), allow e xtra time for the instrument’ s internal temperature to stabilize. Typ­ically, allow one extra hour to stabilize a unit that is 10°C (18°F) outside the specified tempera­ture range.

Also, allow the test equipment to warm up for the minimum time specified by the manufac­turer.

Line power

The Model 2010 Multimeter requires a line voltage of 100V/120V/220V/240V, ±10% and a
line frequency of 45Hz to 66Hz, or 360Hz to 440Hz.

2-4 Calibration

Calibration considerations

When performing the calibration procedures:

• Make sure that the equipment is properly warmed up and connected to the appropriate
input jacks. Also make sure that the correct input jacks are selected with the INPUTS
switch.

• Make sure the calibrator is in operate before you complete each calibration step.

• Always let the source signal settle before calibrating each point.

• Do not connect test equipment to the Model 2010 through a scanner or other switching
equipment.

• If an error occurs during calibration, the Model 2010 will generate an appropriate error
message. See Appendix B for more information.

• Always allow the calibrator to settle before pressing ENTER to complete each step.
(There is a “u” on the display of the 5700A Calibrator that is the settle annunciator).

W ARNING The maximum common-mode voltage (voltage between INPUT LO and chas-

sis ground) is 500V peak. Exceeding this value may cause a breakdown in in­sulation, creating a shock hazard. Some of the procedures in this section may
expose you to dangerous voltages. Use standard safety precautions when
such dangerous voltages are encountered to avoid personal injury caused by
electric shock.

Calibration code

Before performing comprehensive calibration, you must first unlock calibration by entering

the appropriate calibration code.

Front panel code

For front panel calibration, follow these steps:

1. Access the calibration menu by pressing SHIFT CAL, and note that the instrument dis-

Calibration 2-5

plays the following:
CAL: DATES

2. Use the up or down range key to scroll through the a v ailable calibration parameters until
the unit displays RUN, and then press ENTER.

3. The Model 2010 then prompts you to enter a code:
CODE? 000000
The factory default code is 002010. Use the left and right arro w keys to mo ve among the

digits, use the up range key to increment numbers, and press the do wn range key to spec­ify alphabetic letters. Confirm the code by pressing ENTER.

4. The Model 2010 lets you define a new calibration code. Use the up and do wn range keys
to toggle between yes and no. Choose N if you do not want to change the code. Choose
Y if you want to change the code. The unit then prompts you to enter a ne w code. Enter
the code, and press ENTER.

Remote command code

If you are performing calibration over the IEEE-488 b us or the RS-232 port, send the follo w-

ing command to unlock calibration:

CAL:PROT:CODE '<8-character string>'.

The default code command is:
CAL:PROT:CODE 'KI002010'.

NOTE If the first two characters ar e anything other than “KI”, you will not be able to unloc k

cal from the front panel.

2-6 Calibration

Comprehensive calibration

The comprehensive calibration procedure calibrates the DCV, DCI, ACV, ACI, and ohms
functions. You can also choose to calibrate only the DCV/DCI and resistance, or the ACV/ACI
functions.

These procedures are usually the only ones required in the field. Manufacturing calibration is
done at the factory and can be done in the field if the unit has been repaired. See Manufacturing
calibration at the end of this section for more information.

Calibration cycle

Perform comprehensive calibration at least e v ery other year, once a year, or e v ery 90 days to
ensure the unit meets the corresponding specifications.

Recommended equipment

Table 2-1 lists the recommended equipment you need for comprehensive, DC only, and AC
only calibration procedures. You can use alternate equipment, such as a DC transfer standard and
characterized resistors, as long as that equipment has specifications at least as good as those list­ed in the table.

Table 2-1

Recommended equipment for comprehensive, DC-only, or AC-only calibration

Fluke 5700A calibrator:

DC voltage

±10V:±5ppm
100V:±7ppm

AC voltage

(1kHz, 50kHz)*

10mV:±710ppm
100mV:±200ppm

1.0V:±82ppm
10V:±82ppm
100V:±90ppm
700V:±85ppm

DC current

10mA:±60ppm
100mA:±70ppm
1A:±110ppm

AC current

(1kHz)

100mA:±190ppm
1A:±690ppm
2A:±670ppm

Resistance

10

Ω :±28ppm

1k

Ω :±12ppm

10k

Ω :±11ppm

100k

Ω :±13ppm

1M

Ω :±18ppm

Keithley 8610 Low-thermal shorting plug

* 1kHz specifications. 10mV and 700V points require 1kHz only. All calibrator specifications are 90-

day, 23°C ±5°C specifications and indicate total absolute uncertainty at specified output.

Aborting calibration

You can abort the front panel calibration process at any time by pressing EXIT. The instru-

ment will then ask you to confirm your decision to abort with the following message:

ABORT CAL?

Press EXIT to abort calibration at this point, or press any other key to return to the calibration

process.

NOTE The Model 2010 will not respond to any remote programming commands while the

ABORT CAL? message is displayed.

Calibration 2-7

2-8 Calibration

Front panel calibration

Use the following steps for comprehensive, DC-only, and AC-only calibration procedures.

The procedures for front panel calibration include:

• Preparing the Model 2010 for calibration

• Front panel short and open calibration

• DC voltage calibration

• Resistance calibration

• DC current calibration

• AC voltage calibration

• AC current calibration

• Setting calibration dates

Preparing the Model 2010 for calibration

1. Turn on the Model 2010, and allo w it to warm up for at least two hours before performing
calibration procedure.

2. Start the calibration process as follows:
A. Access the calibration menu by pressing SHIFT then CAL.

B. Use the up and down range keys to scroll through the available calibration menu

items until the unit displays RUN, and then press ENTER.

C. At the prompt, enter the calibration code. (The default code is 002010.) Use the left

and right arrow keys to move among the digits, use the up range key to increment
numbers, and press the down range key to specify alphabetic letters. Confirm the
code by pressing ENTER.

D. Choose N at the prompt to proceed without changing the code, and then press EN-

TER.

3. Choose which of the calibration tests summarized in Table 2-2 you want to run at the
CAL: RUN prompt. Use the up and do wn range keys to scroll through the options; select
your choice by pressing ENTER.

Table 2-2

Comprehensive calibration procedures

Procedure

Full calibration
DCV, DCI, and ohms
ACV and ACI

Menu
choice Procedures

ALL
DC
AC

All comprehensive calibration steps.
DC voltage, DC current, and resistance calibration.
AC voltage and AC current.

Front panel short and open calibration

At the Model 2010 prompt for a front panel short, perform the following:

1. Connect the Model 8610 low-thermal short to the instrument front panel INPUT and
SENSE terminals as shown in Figure 2-1. Make sure the INPUTS button is not pressed
in so that the front inputs are selected. Wait at least three minutes before proceeding to
allow for thermal equilibrium.

NOTE Be sure to connect the low-thermal short properly to the HI, LO, and SENSE termi-

nals. Keep drafts away from low-thermal connections to avoid thermal drift, which
could affect calibration accuracy.

Calibration 2-9

Figure 2-1

Low-thermal
short connections

Model 2010

S+ HI

2000 MULTIMETER

!

R

Model 8610
low-thermal
short

LOS-

2. Press ENTER to start short-circuit calibration. While the unit is calibrating, the unit will
display:

CALIBRATING

3. When the unit is done calibrating, it will display the following prompt:
OPEN CIRCUIT

4. Remove the calibration short, and press ENTER. During this phase, the CALIBRATING
message will be displayed.

2-10 Calibration

DC volts calibration

After the front panel short and open procedure, the unit will prompt you for the first DC volt-

age: +10V. Perform the following:

1. Connect the calibrator to the Model 2010 as shown in Figure 2-2. Wait three minutes to
allow for thermal equilibrium before proceeding.

NOTE Although 4-wire connections are shown, the sense leads are connected and discon-

nected at various points in this procedure by turning calibrator external sense on or
off as appropriate. If your calibrator does not have provisions for turning external
sense on and off, disconnect the sense leads when external sensing is to be turned of f ,
and connect the sense leads when external sensing is to be turned on. Do not exceed
±15V peak on sense LO to LO. This will cause erroneous r eadings to be stored during
calibration.

Figure 2-2

Calibrator con­nections for DC
volts and ohms
portion of com­prehensive cali­bration

5700A Calibrator

Sense LO

Model 2010

2000

Sense LO

Sense HI

MULTIMETER

!

R

Sense HI

Input
HI

Output
HI

InputLOOutput

LO

Note : Use shielded low-thermal cables to
minimize noise. Enable or disable
calibrator external sense as indicated
in procedure.

2. Set the calibrator to output DC volts, and turn external sense off.

3. Perform the steps listed in Table 2-3 to complete DC volts calibration. For each calibra­tion step:

• Set the calibrator to the indicated value, and make sure it is in operate.

• Press the ENTER key to calibrate that step.

• Wait until the Model 2010 finishes each step. The unit will display the CALIBRAT­ING message while calibrating.

NOTE If your calibrator cannot output the values recommended in T able 2-3, use the left and

right arrow ke ys, and the up and down rang e keys to set the Model 2010 display value
to match the calibrator output voltage.

Table 2-3

DC volts calibration summary

Calibration 2-11

Calibration
step

+10V

-10V
100V

Calibrator
voltage

+10.00000V

-10.00000V
+100.0000V

Resistance calibration

Completing the 100V DC calibration step ends the DC voltage calibration procedure. The

Model 2010 will then prompt you to connect 10

1. Set the calibrator output for resistance, and turn on external sense.

NOTE Use external sense (4-wire

calibrator external sense mode is turned on.

2. Perform the calibration steps summarized in Table 2-4. For each step:

• Set the calibrator to the indicated value, and place the unit in operate. (If the calibrator
cannot output the exact resistance value, use the Model 2010 left and right arro w ke ys
and the range keys to adjust the Model 2010 display to agree with the calibrator resis­tance.)

• Press the ENTER key to calibrate each point.

• Wait for the Model 2010 to complete each step before continuing.

Allowable
range

+9V to +11V

-9V to -11V
+90V to +110V

Ω . Follow these steps for resistance calibration:

Ω

) when calibrating all resistance r anges. Be sur e that the

Table 2-4

Ohms calibration summary

Calibration
step

10 Ω
1k Ω
10k Ω
100k Ω
1M Ω

* Nominal resistance. Adjust Model 2010 calibration

parameter to agree with actual value.

Calibrator
resistance*

10 Ω
1k Ω
10k Ω
100k Ω
1M Ω

Allowable range

9 Ω to 11 Ω

0.9k Ω to 1.1k Ω
9k Ω to 11k Ω
90k Ω to 110k Ω

0.9M Ω to 1.1M Ω

2-12 Calibration

DC current calibration

After the 1M Ω resistance point has been calibrated, the unit will prompt you for 10mA. Fol-

low these steps for DC current calibration:

1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2010 as
shown in Figure 2-3.

Figure 2-3

Connections for
DC and AC amps
comprehensive
calibration

5700A Calibrator

Model 2010

2000

MULTIMETER

Input
LO

Output HI

!

R

Amps

Output
LO

Note: Be sure calibrator is set for

normal current output.

2. Calibrate each current step summarized in Table 2-5. For each step:

• Set the calibrator to the indicated DC current, and make sure the unit is in operate.

• Make sure the Model 2010 display indicates the correct calibration current.

• Press ENTER to complete each step.

• Allow the Model 2010 to finish each step.

NOTE If you are performing DC-only calibration, proceed to Setting calibration dates.

Table 2-5

DC current calibration summary

Calibration
step

Calibrator
current

Allowable
range

10mA
100mA
1A

10.00000mA

100.0000mA

1.000000A

9mA to 11mA
90mA to 110mA

0.9A to 1.1A

AC voltage calibration

Follow these steps for AC voltage calibration:

1. Connect the calibrator to the Model 2010 INPUT HI and LO terminals as shown in Fig­ure 2-4.

Calibration 2-13

Figure 2-4

Connections for
AC volts calibra­tion

5700A Calibrator

R

!

Input HI

Output HI

Input
LO

Output
LO

Model 2010

2000 MULTIMETER

2. Perform the calibration steps summarized in Table 2-6. For each step:

• Set the calibrator to the indicated value, and make sure the calibrator is in operate.

• Press ENTER to complete each step.

• Wait until the Model 2010 completes each step.

Table 2-6

AC voltage calibration summary

Calibration step

10mV AC at 1kHz
100mV AC at 1kHz
100mV AC at 50kHz
1V AC at 1kHz
1V AC at 50kHz
10V AC at 1kHz
10V AC at 50kHz
100V AC at 1kHz
100V AC at 50kHz
700V AC at 1kHz

Calibrator voltage,
frequency

10.00000mV, 1kHz

100.0000mV, 1kHz

100.0000mV, 50kHz

1.000000V, 1kHz

1.000000V, 50kHz

10.00000V, 1kHz

10.00000V, 50kHz

100.0000V, 1kHz

100.0000V, 50kHz

700.000V, 1kHz

NOTE Do not exceed ±15V peak between sense LO and LO. You may have to remove the ex-

ternal sense leads before calibrating AC volts. Even though some calibr ators can turn
off their external sense, the AC voltage can still cause excess voltage to appear be­tween sense LO and LO.

2-14 Calibration

AC current calibration

After the 700V AC at 1kHz point has been calibrated, the unit will prompt you for 100mA at

1kHz. Follow these steps for AC current calibration:

1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2010 as
shown in Figure 2-3.

2. Perform the calibration steps summarized in Table 2-7. For each step:

• Set the calibrator to the indicated current and frequency, and make sure the unit is in
operate.

• Press ENTER to complete each calibration step.

• Allow the unit to complete each step before continuing.

Table 2-7

AC current calibration summary

Calibration
step

100mA at 1kHz
1A at 1kHz
2A at 1kHz

Calibrator current,
frequency

100.0000mA, 1kHz

1.000000A, 1kHz

2.000000A, 1kHz

Setting calibration dates

At the end of the calibration procedure, the instrument will display the CALIBRATION
COMPLETE message. Press ENTER to continue, and the Model 2010 will prompt you to enter
the calibration date and the calibration due date. Set these dates as follows:

1. At the CAL DATE: mm/dd/yy prompt, use the left and right arrow keys and the range
keys to set the calibration date, and then press ENTER.

2. The unit will then prompt you to enter the next calibration due date with this prompt:
CAL NDUE: mm/dd/yy. Use the left and right arrow keys and the range keys to set the
calibration due date, and then press ENTER.

3. The unit will prompt you to save new calibration constants with this message: SAVE
CAL? YES. To save the new constants, press ENTER. If you do not want to sa ve the ne w
constants, press the down range key to toggle to NO, and then press ENTER.

Calibration 2-15

NOTE Calibration constants calculated during the curr ent calibration pr ocedur e will not be

saved unless you choose the YES option. Previous calibration constants will be re­tained if you select NO.

If an incorrect date is enter ed, the “INVALID DATE” message will be displayed. The
menu will remain until a valid date is entered.

2-16 Calibration

Remote calibration

Use the following steps to perform comprehensi ve, DC-only, and AC-only calibration proce­dures by remote. See Appendix B for a detailed list and description of SCPI calibration com­mands.

When sending calibration commands, be sure that the Model 2010 completes each step before
sending the next command. You can do so by observing the front panel CALIBRATING mes­sage or by detecting the completion of each step over the bus.

The procedures for calibrating the Model 2010 using SCPI commands include:

• Preparing the Model 2010 for calibration

• Front panel short and open calibration

• DC volts calibration

• Resistance calibration

• DC current calibration

• AC volts calibration

• AC current calibration

• Programming calibration dates

• Saving calibration constants

• Locking out calibration

NOTE As with front panel calibr ation, you can c hoose to perform comprehensive, DC-only ,

or AC-only calibr ation. Be sur e to include a space char acter between each command
and parameter.

Preparing the Model 2010 for calibration

1. Connect the Model 2010 to the IEEE-488 bus of the computer using a shielded IEEE­488 cable, such as the Keithley Model 7007, or connect the unit to a computer through
the RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9-25-pin adapter if
necessary).

2. Turn on the Model 2010, and allow it to warm up for two hours before performing cali­bration.

3. Select the DCV function, and choose SLOW as the rate (integration time = 5PLC).

4. Make sure the primary address of the Model 2010 is the same as the address specified in
the program that you will be using to send commands. Use the GPIB key.

5. Unlock the calibration function by sending this command:
:CAL:PROT:CODE 'KI002010'

Calibration 2-17

(The above command shows the default code, KI002010. Substitute the correct code if
changed.)

6. Send the following command to initiate calibration:
:CAL:PROT:INIT

Short and open calibration

1. Connect the Model 8610 low-thermal short to the instrument INPUT and SENSE termi­nals as shown in Figure 2-1. Make sure the INPUTS b utton is not pressed in so that the
front inputs are active. W ait at least three minutes before proceeding to allo w for thermal
equilibrium.

NOTE Be sure to connect the low-thermal short properly to the HI, LO, and SENSE termi-

nals. Keep drafts away from low-thermal connections to avoid thermal drift, which
could affect calibration accuracy.

2. Send the following command:
:CAL:PROT:DC:STEP1

3. After the Model 2010 completes this step, remove the low-thermal short and send this
command:

:CAL:PROT:DC:STEP2

2-18 Calibration

DC volts calibration

After front panel short and open steps, perform the following:

1. Connect the calibrator to the Model 2010 as shown in Figure 2-2. Allow three minutes
for thermal equilibrium.

NOTE Although 4-wire connections are shown, the sense leads are connected and discon-

nected at various points in this procedure by turning calibrator external sense on or
off as appropriate. If your calibrator does not have provisions for turning external
sense on and off, disconnect the sense leads when external sensing is to be turned of f ,
and connect the sense leads when external sensing is to be turned on. Disconnect
sense leads when calibrating and verifying AC volts.

NOTE Disconnect sense leads when calibrating and verifying AC volts.

2. Perform the calibration steps summarized in Table 2-8. For each step:

• Set the calibrator to the indicated voltage, and make sure the unit is in operate. (Use
the recommended voltage if possible.)

• Send the indicated programming command. (Change the voltage parameter if you are
using a different calibration voltage.)

• Wait until the Model 2010 completes each step before continuing.

Table 2-8

DC voltage calibration programming steps

Calibration
step

+10V

-10V
100V

* Change parameter accordingly if using a different calibrator voltage.

Calibrator
voltage

+10.00000V

-10.00000V

100.0000V

Calibration command*

:CAL:PROT:DC:STEP3 10
:CAL:PROT:DC:STEP4 -10
:CAL:PROT:DC:STEP5 100

Parameter
range

9 to 11

-9 to -11
90 to 110

Resistance calibration

Follow these steps for resistance calibration:

1. Set the calibrator to the resistance mode, and turn on external sensing.

Calibration 2-19

NOTE Use external sense (4-wire

calibrator external sense mode is turned on,

2. Perform the calibration steps summarized in Table 2-9. For each step:

• Set the calibrator to the indicated resistance, and make sure the unit is in operate.
(Use the recommended resistance or the closest available value.)

• Send the indicated programming command. (Change the command parameter if you
are using a different calibration resistance than that shown.)

• Wait until the Model 2010 completes each step before continuing.

Table 2-9

Resistance calibration programming steps

Calibration
step

10Ω
1kΩ
10kΩ
100kΩ
1MΩ

* Use exact calibrator resistance value for parameter.

Calibrator
resistance

10Ω
1kΩ
10kΩ
100kΩ
1MΩ

Calibration command* Parameter range

:CAL:PROT:DC:STEP6 10
:CAL:PROT:DC:STEP7 1E3
:CAL:PROT:DC:STEP8 10E3
:CAL:PROT:DC:STEP9 100E3
:CAL:PROT:DC:STEP10 1E6

Ω

) when calibrating all resistance r anges. Be sur e that the

9 to 11
900 to 1.1E3
9E3 to 11E3
90E3 to 110E3
900E3 to 1.1E6

2-20 Calibration

DC current calibration

After the 1MΩ resistance point has been calibrated, follow these steps for DC current cali-

bration:

1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2010 as
shown in Figure 2-3.

2. Perform the calibration steps listed in Table 2-10. For each step:

• Set the calibrator to the indicated current, and make sure the unit is in operate. (Use
the recommended current if possible.)

• Send the indicated programming command. (Change the current parameter if you are
using a different calibration current.)

• Wait until the Model 2010 completes each step before continuing.

NOTE If you are performing DC-only calibration, proceed to Programming calibration

dates.

Table 2-10

DC current calibration programming steps

Calibration
step

10mA
100mA
1A

* Change parameter if using different current.

Calibrator
current

10.00000mA

100.00000mA

1.000000A

Calibration command* Parameter range

:CAL:PROT:DC:STEP11 10E-3
:CAL:PROT:DC:STEP12 100E-3
:CAL:PROT:DC:STEP13 1

9E-3 to 11E-3
90E-3 to 110E-3

0.9 to 1.1

AC voltage calibration

Follow these steps for AC voltage calibration:

1. Connect the calibrator to the Model 2010 INPUT HI and LO terminals as shown in Fig­ure 2-4.

NOTE Disconnect any sense leads from the calibrator to the Model 2010 when calibrating

or verifying AC volts. Even though some calibr ators pr ovide an external sense enable/
disable function, excessive voltage (±15V peak) may be applied and will corrupt the
calibration or verify.

2. Perform the calibration steps summarized in Table 2-11. For each step:

• Set the calibrator to the indicated v oltage and frequenc y, and make sure the unit is in
operate. (You must use the stated voltage and frequency.)

• Send the indicated programming command.

• Wait until the Model 2010 completes each step before continuing.

Table 2-11

AC voltage calibration programming steps

Calibration 2-21

Calibration step

10mV AC at 1kHz
100mV AC at 1kHz
100mV AC at 50kHz
1V AC at 1kHz
1V AC at 50kHz
10V AC at 1kHz
10V AC at 50kHz
100V AC at 1kHz
100V AC at 50kHz
700V AC at 1kHz

Calibrator voltage,
frequency

10.00000mV, 1kHz

100.0000mV, 1kHz

100.0000mV, 50kHz

1.000000V, 1kHz

1.000000V, 50kHz

10.00000V, 1kHz

10.00000V, 50kHz

100.0000V, 1kHz

100.0000V, 50kHz

700.000V, 1kHz

Calibration command

:CAL:PROT:AC:STEP1
:CAL:PROT:AC:STEP2
:CAL:PROT:AC:STEP3
:CAL:PROT:AC:STEP4
:CAL:PROT:AC:STEP5
:CAL:PROT:AC:STEP6
:CAL:PROT:AC:STEP7
:CAL:PROT:AC:STEP8
:CAL:PROT:AC:STEP9
:CAL:PROT:AC:STEP10

2-22 Calibration

AC current calibration

Follow these steps for AC current calibration:

1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2010 as
shown in Figure 2-3.

2. Perform the calibration steps summarized in Table 2-12. For each step:

• Set the calibrator to the indicated current and frequency, and make sure the unit is in
operate. (You must use the stated current and frequency.)

• Send the indicated programming command.

• Wait until the Model 2010 completes each step before continuing.

Table 2-12

AC current calibration programming steps

Calibration
step

100mA at 1kHz
1A at 1kHz
2A at 1kHz

Calibrator current,
frequency

100.0000mA, 1kHz

1.000000A, 1kHz

2.000000A, 1kHz

Programming calibration dates

Program the present calibration date and calibration due date by sending the following com-

mands:

:CAL:PROT:DATE <year>, <month>, <day>
:CAL:PROT:NDUE <year>, <month>, <day>

For example, the following commands assume calibration dates of 12/15/95 and 3/14/96 re-

spectively:

:CAL:PROT:DATE 1995, 12, 15
:CAL:PROT:NDUE 1996, 3, 14

NOTE If an incorrect date is sent, an error will be generated.

Calibration command

:CAL:PROT:AC:STEP11
:CAL:PROT:AC:STEP12
:CAL:PROT:AC:STEP13

Saving calibration constants

After completing the calibration procedure, send the following command to sa ve the ne w cal-

ibration constants:

:CAL:PROT:SAVE

NOTE Calibration constants will not be saved unless the :SAVE command is sent.

Locking out calibration

After saving calibration, send the following command to lock out calibration:
:CAL:PROT:LOCK

Calibration 2-23

2-24 Calibration

Manufacturing calibration

The manufacturing procedure is normally performed only at the factory, but the necessary
steps are included here in case the unit is repaired, and the unit requires these calibration proce­dures.

NOTE If the unit has been repaired, the entire comprehensive calibration procedure should

also be performed in addition to the manufacturing calibration procedure.

Recommended test equipment

Table 2-13 summarizes the test equipment required for the manufacturing calibration steps.
In addition, you will need the Fluke 5700A Calibrator (see Table 2-1) to complete the compre­hensive calibration steps.

Table 2-13

Recommended equipment for manufacturing calibration

Keithley 3930A or 3940 Frequency Synthesizer:

1V RMS, 3Hz, ±5ppm
1V RMS, 1kHz, ±5ppm

Keithley Model 2001 or 2002 Digital Multimeter:

1V, 3Hz AC, ±0.13%

Keithley Model 8610 Low-thermal short

Unlocking manufacturing calibration

To unlock manufacturing calibration, press and hold in the OPEN key while turning on the
power.

Measuring synthesizer signal amplitude

The 3Hz synthesizer signal amplitude must be accurately measured using the digital multi­meter listed in Table 2-13. Proceed as follows:

1. Connect the synthesizer output to the Model 2001/2002 Digital Multimeter INPUT
jacks. (See Figure 2-5 for typical connections.)

2. Turn on the synthesizer and multimeter, and allow a two-hour warm-up period before
measuring.

3. Set the synthesizer to output a 1V RMS sine wave at 3Hz; measure and record the signal
amplitude.

Front panel manufacturing calibration

1. Press in and hold the OPEN key while turning on the power.

2. Connect the low-thermal short to the rear panel input jacks, and select the rear inputs
with the INPUTS switch. Allow three minutes for thermal equilibrium.

3. Press SHIFT then CAL, select RUN, and then enter the appropriate calibration code (de­fault: 002010).

4. Select ALL at the CAL:RUN prompt.

5. Press ENTER.

6. Perform the entire front panel comprehensive calibration procedure discussed earlier in
this section. (See Comprehensive calibration.)

7. Connect the synthesizer to the Model 2010 front panel INPUT jacks as shown in Figure
2-5. Select the front input jacks with the INPUTS switch.

Calibration 2-25

Figure 2-5

Synthesizer con­nections for man­ufacturing
calibration

Model 3930A or 3940 Synthesizer

50Ω BNC Coaxial Cable

Note: Synthesizer output voltage
must be accurately measured.
(See text).

Main

Function

Output

Model 2010

2000 MULTIMETER

!

R

BNC-to-Dual

Banana Plug

Adapter

8. After the last A C current calibration step, the instrument will prompt you to enter 3Hz at
1V RMS and 1kHz with the following prompts:

• Low-frequency cal: Set the synthesizer to output a 1V RMS, 3Hz sine w ave. Use the left
and right arrow keys and the range k eys to adjust the display to agree with the synthesizer
amplitude you measured previously, and then press ENTER.

• Frequency cal: Set the synthesizer to output a 1V RMS, 1kHz sine wave. Enter

1.000000kHz at the prompt, and then press ENTER.

9. Set the calibration dates, and then save calibration to complete the process.

2-26 Calibration

Remote manufacturing calibration

1. Connect the low-thermal short to the rear panel input jacks, and select the rear inputs
with the INPUTS switch. Allow three minutes for thermal equilibrium.

2. Press in and hold the OPEN key while turning on the power.

3. Enable calibration by sending the :CODE command. For example, the def ault command
is:

:CAL:PROT:CODE 'KI002010'

4. Initiate calibration by sending the following command:
:CAL:PROT:INIT

5. Calibrate step 0 with the following command:
:CAL:PROT:AC:STEP0

6. Perform the entire SCPI command comprehensive calibration procedure discussed ear­lier in this section. (See Comprehensive calibration.)

7. Connect the synthesizer to the Model 2010 INPUT jacks as shown in Figure 2-5. Select
the front input jacks with the INPUTS switch.

8. Set the synthesizer to output a 1V RMS, 3Hz sine wave, and then send the following
command:

:CAL:PROT:AC:STEP14 <Cal_voltage>
<Cal_voltage> is the actual 3Hz synthesizer signal amplitude you measured pre viously.

9. Set the synthesizer to output a 1V RMS, 1kHz sine wave, and then send the following
command:

:CAL:PROT:AC:STEP15 1E3

10. Send the following commands to set calibration dates, sav e calibration, and lock out cal­ibration:

:CAL:PROT:DATE <year>, <month>, <day>
:CAL:PROT:NDUE <year>, <month>,<day>
:CAL:PROT:SAVE
:CAL:PROT:LOCK

3

Routine

Maintenance

3-2 Routine Maintenance

Introduction

This section describes routine type maintenance that can be performed by the operator and

includes procedures for replacing both the line fuse and the amps fuse.

Setting the line voltage and replacing the line fuse

W ARNING Disconnect the line cord at the rear panel, and remove all test leads connect-

ed to the instrument (front and rear) before replacing the line fuse.

The power line fuse is located in the power module ne xt to the AC power receptacle (see Fig­ure 3-1). If the line voltage must be changed or if the line fuse requires replacement, perform the
following steps:

1. Place the tip of a flat-blade screwdriv er into the po wer module by the fuse holder assem­bly (see Figure 3-1). Gently push in and turn to the left. Release pressure on the assem­bly, and its internal spring will push it out of the power module.

2. Remove the fuse, and replace it with the type listed in Table 3-1.

CAUTION For continued protection against fire or instrument damage, replace the fuse

only with the type and rating listed. If the instrument repeatedly blows fuses,
locate and correct the cause of the trouble before replacing the fuse.

3. If configuring the instrument for a different line voltage, remo ve the line voltage selector
from the assembly , and rotate it to the proper position. When the selector is installed into
the fuse holder assembly, the correct line voltage appears inverted in the window.

4. Install the fuse holder assembly into the power module by pushing it in until it locks in
place.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Routine Maintenance 3-3

Figure 3-1

Power module

HI

350V

!

PEAK

LO

SENSE

Ω 4W

!

Table 3-1

Power line fuse

Line voltage Rating

Model 2010

MADE IN

TRIGGER

U.S.A.

LINK

RS232

!

VMC
EXT TRIG

!

FUSE LINE

250mAT

100 VAC

(SB)

120 VAC

220 VAC

125mAT

240 VAC

(SB)

1000V
PEAK

500V

3 5

1

PEAK

INPUT

4 6

2

IEEE-488

(CHANGE IEEE ADDRESS

FROM FRONT PANEL)

120

LINE RATING

50, 60
400HZ

17 VA MAX

Line Voltage Selector

Fuse

220

240

120

100

Spring

Window

Fuse Holder Assembly

Keithley part
no.

100/120V
220/240V

0.25A, slow-blow

0.125A, slow-blow

Note: 5 × 20mm fuses required

FU-96-4
FU-91

3-4 Routine Maintenance

Replacing the AMPS fuse

The AMPS fuse protects the current input from an over-current condition. Follow the steps

below to replace the AMPS fuse.

WARNING Make sure the instrument is disconnected from the power line and other

equipment before replacing the AMPS fuse.

1. Turn off the power, and disconnect the power line and test leads.

2. From the front panel, gently push in the AMPS jack with your thumb, and rotate the fuse
carrier one-quarter turn counter-clockwise. Release pressure on the jack, and its internal
spring will push the fuse carrier out of the socket.

3. Remove the fuse, and replace it with the same type: 3A, 250V, fast blow, Keithley part
number FU-99-1.

CAUTION Do not use a fuse with a higher current rating than specified, or instrument

damage may occur. If the instrument repeatedly blows fuses, locate and cor­rect the cause of the trouble before replacing the fuse.

4. Install the new fuse by reversing the above procedure.

4

Troubleshooting

4-2 Troubleshooting

Introduction

This section of the manual will assist you in troubleshooting and repairing the Model 2010.
Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions. It is left
to the discretion of the repair technician to select the appropriate tests and documentation needed
to troubleshoot the instrument.

WARNING The information in this section is intended for qualified service personnel

only . Do not perform these procedures unless you are qualified to do so. Some
of these procedures may expose you to hazardous voltages that could cause
personal injury or death. Use caution when working with hazardous voltag­es.

Repair considerations

Before making any repairs to the Model 2010, be sure to read the following considerations.

CAUTION The PC boards are built using surface mount techniques and require special-

ized equipment and skills for repair. If you are not equipped and/or qualified,
it is strongly recommended that you send the unit back to the factory for re­pairs or limit repairs to the PC board replacement level. Without proper
equipment and training, you could damage a PC board beyond repair.

• Repairs will require various degrees of disassembly. However, it is recommended that
the Front Panel Tests be performed prior to any disassembly. The disassembly instruc­tions for the Model 2010 are contained in Section 5 of this manual.

• Do not make repairs to surface mount PC boards unless equipped and qualified to do so
(see previous CAUTION).

• When working inside the unit and replacing parts, be sure to adhere to the handling pre­cautions and cleaning procedures explained in Section 5.

• Many CMOS devices are installed in the Model 2010. These static-sensitive devices re­quire special handling as explained in Section 5.

• Whenever a circuit board is removed or a component is replaced, the Model 2010 must
be recalibrated. See Section 2 for details on calibrating the unit.

Power-on self-test

During the power-on sequence, the Model 2010 will perform a checksum test on its EPROM
(U156 and U157) and test its RAM (U151 and U152). If one of these tests fails, the instrument
will lock up.

Troubleshooting 4-3

Front panel tests

There are two front panel tests: one to test the functionality of the front panel keys and one to
test the display. In the event of a test failure, refer to Display board checks for details on trou­bleshooting the display board.

KEY test

The KEY test allows you to check the functionality of each front panel key. Perform the fol­lowing steps to run the KEY test:

1. Press SHIFT and then TEST to access the self-test options.

2. Use the up or down RANGE key to display TEST: KEY.

3. Press ENTER to start the test. When a key is pressed, the label name for that key is dis­played to indicate that it is functioning properly . When the ke y is released, the “NO KEY
PRESS” message is displayed.

4. Pressing EXIT tests the EXIT key. However, the second consecutive press of EXIT
aborts the test and returns the instrument to normal operation.

DISP test

rescent display is working properly. Perform the following steps to run the display test:

The display test allows you to verify that each segment and annunciator in the vacuum fluo-

1. Press SHIFT and then TEST to access the self-test options.

2. Use the up or down RANGE key to display TEST: DISP.

3. Press ENTER to start the test. There are four parts to the display test. Each time EN­TER is pressed, the next part of the test sequence is selected. The four parts of the
test sequence are:

• All annunciators are displayed.

• The segments of each digit are sequentially displayed.

• The 12 digits (and annunciators) are sequentially displayed.

• The annunciators located at either end of the display are sequentially displayed.

4. When finished, abort the display test by pressing EXIT . The instrument returns to normal
operation.

4-4 Troubleshooting

Principles of operation

The following information is provided to support the troubleshooting tests and procedures

covered in this section of the manual. Refer to the following block diagrams:

Figure 4-1 — Power supply block diagram
Figure 4-2 — Digital circuitry block diagram
Figure 4-3 — Analog circuitry block diagram

Power supply

The following information provides some basic circuit theory that can be used as an aid to

troubleshoot the power supply. A block diagram of the power supply is shown in Figure 4-1.

AC power is applied to the AC power module receptacle (J1009). Power is routed through the
line fuse and line voltage selection switch of the power module to the power transformer. The
power transformer has a total of four secondary windings for the various supplies.

AC voltage for the display fi laments is taken from a power transformer secondary at F1 and
F2, and then routed to the display board.

Each DC supply uses a rectifier and a capacitive filter , and man y supplies use an IC regulator .
Table 4-1 summarizes rectifier, filter, and regulator circuits for the various DC supplies.

Table 4-1

Power supply components

Supply Rectifier Filter Regulator

+5VD
+37V
+15V

-15V
+5V, +5VRL
+25V

-25V
+18V

-18V
+20V

CR104
CR116, CR117
CR102
CR102
CR103
CR136, CR140, CR141
CR137, CR138, CR139
CR102
CR102
–

C156, C175
C104
C148
C131
C146
C281
C284
–
–
C279, C281

U144
U101
U180
U179
U124
–
–
–
–
U187

Troubleshooting 4-5

Figure 4-1

Power supply
block diagram

Fuse

Power

Switch

Line

Voltage

Switch

Power

Transformer

CR104

C175, C156

U144

CR116, CR117

C108
U101

CR102

C131, C148

U179, U180

CR103

C146
U124

CR102, CR136
CR137, CR138
CR139, CR140

CR141, C281

C284

+5VD

D Common

+37V

D Common

+15V

A Common

-15V

+5V, +5VRL

A Common

+18V

A Common

-18V

-25V
A Common

+25V

U187

C279
C281

+20V

A Common

4-6 Troubleshooting

Display board

Display board components are shown in the digital circuitry block diagram in Figure 4-2.

Microcontroller

U401 is the display board microcontroller that controls the display and interprets key data.
The microcontroller uses three internal peripheral I/O ports for the various control and read
functions. Display data is serially transmitted to the microcontroller from the digital section via
the TXB line to the microcontroller RDI terminal. In a similar manner, key data is serially sent
back to the digital section through the RXB line via TDO. The 4MHz clock for the microcon­troller is generated by crystal Y401.

Display

DS401 is the display module, which can display up to 12 alphanumeric characters and in­cludes the various annunciators.

The display uses a common multiplexing scheme with each character refreshed in sequence.
U402 and U403 are the drivers for the display characters and annunciators. Note that data for
the drivers is serially transmitted from the microcontroller (MOSI and PC1).

Filament voltage for the display is derived from the power supply transformer (F1 and F2).
The display drivers require +37VDC and +5VDC, which are supplied by U144 (+5VD) and
U101 (+37V).

Key matrix

The front panel keys (S401-S430) are organized into a row-column matrix to minimize the
number of microcontroller peripheral lines required to read the keyboard. A k ey is read by strob­ing the columns and reading all rows for each strobed column. K e y-do wn data is interpreted by
the display microcontroller and sent back to the main microprocessor using proprietary encod­ing schemes.

Digital circuitry

Refer to Figure 4-2 for the following discussion on digital circuitry.

Microprocessor

U135 is a 68306 microprocessor that oversees all operating aspects of the instrument. The
MPU has a 16-bit data bus and provides an 18-bit address b us. It also has parallel and serial ports
for controlling various circuits. For example, the RXDA, TXDA, RXDB and TXDB lines are
used for the RS-232 interface.

The MPU clock frequency of 14.7456MHz is controlled by crystal Y101.

Troubleshooting 4-7

Figure 4-2

Digital circuitry
block diagram

Analog

Circuitry

(See Figure 4-3)

XADTX
XADCLK
XADTS

XADRX

Scan Control

Memory circuits

O

O

O

AT101

U150
U155

Trigger

U146, U164

Trigger

Link

P
T

I

S

NVRAM

U136

ADTX
ADCLK
ADTS

ADRXB

TRIG IN
TRIG OUT

ROM

U156, U157

68306

µP

U135

U151, U152

IN

OUT

Data IN
Data OUT

RAM

RS-232

U158, U160,

Display Board

Controller

U401

XTAL
Y101

U159

GPIB

U161

Keypad

Display

DS401

RS-232

Port

IEEE-488

Bus

ROMs U156 and U157 store the firmware code for instrument operation. U157 stores the D0-

D7 bits of each data word, and U156 stores the D8-D15 bits.

RAMs U151 and U152 provide temporary operating storage. U152 stores the D0-D7 bits of

each data word, and U151 stores the D8-D15 bits.

Semi-permanent storage facilities include NVRAM U136. This IC stores such information as
instrument setup and calibration constants. Data transmission from this device is performed se­rially.

RS-232 interface

Serial data transmission and reception is performed by the TXDB and RXDB lines of the
MPU. U159 provides the necessary voltage level conversion for the RS-232 interface port.

IEEE-488 interface

U158, U160, and U161 make up the IEEE-488 interface. U158, a 9914A GPIA, takes care of
routine bus overhead such as handshaking, while U160 and U161 provide the necessary buffer­ing and drive capabilities.

4-8 Troubleshooting

T rigger circuits

Buffering for Trigger Link input and output is performed by U146. T rigger input and output
is controlled by the IRQ4 and PB3 lines of the MPU. U164 provides additional logic for the trig­ger input to minimize MPU control overhead.

At the factory, trigger output is connected to line 1 of the Trigger Link connector (resistor
R267 installed). Trigger input is connected to line 2 of the T rigger Link connector (resistor R270
installed).

Analog circuitry

Refer to Figure 4-3 for the following discussion on analog circuitry.

Figure 4-3

Analog circuitry
block diagram

AMPS

INPUT

HI

R117, Q109,
Q114, Q136

SENSE

HI

SENSE

LO

Scanner Output

Scanner

Inputs

Current Shunts

Q165, Q164, K103,

R158, R205, R386,

Q101, Q102

DCV

Divider

DCV/100

R373, Q121, Q135

Scanner

Option

*Solid State Protection

R450

K101
SSP*

Protection

DCA
ACA

AC Switching

&

Gain

K102, U102, U103, U105,

U112, U118, U111, U110

ACV,

FREQ

DCV

OHMS

SSP

Q153, CR132

Ohms I-Source
U133, Q123, Q125,
Q124, Q126, Q119,

Q166, U123

Scanner Control

DCV & Ohms

Switching

Q104, Q105,

Q108, Q113

X1

Buffer
Q137,
Q138,
U166,

U167

BUFCOM

A/D

MUX &

Gain

U163, U177,

U176, Q156

ADC
U165

Digital

Circuitry

(See Figure 4-2)

INPUT HI

INPUT HI protection is provided by the SSP (solid state protection) circuit. The SSP is pri­marily made up of Q101 and Q102. An overload condition opens Q101 and Q102, which dis­connects the analog input signal from the rest of the analog circuit.

Note that for the 100VDC and 1000VDC ranges, Q101 and Q102 of the SSP are open. The
DC voltage signal is routed through the DCV Divider (Q114 and Q136) to the DCV switching
circuit.

Troubleshooting 4-9

AMPS input

The ACA or DCA input signal is applied to the Current Shunt circuit, which is made up of
K103, Q165, Q164, R205, R450, R386, and R158. U178 controls if either Q164 or Q165 is
turned on. For the 3A and 1A DCA ranges and all ACA ranges, 0.1
the input (K103 off). For the 100mA DCA range, K103 is ener gized (on). Q164 (both) are turned
on with the LOAMP control line set high. 1.01
the 10mA DCA range, K103 is energized (on). Q165 (both) are turned on with the LO AMP con­trol line set low. 10.1

The A CA signal is then sent to the A C Switching & Gain circuit, while the DCA signal is rout­ed directly to the A/D MUX & Gain circuit.

Ω (R205//R450 + R386 + R158) is shunted across the input.

Ω (R386 + R158) is shunted across the input. For

Ω (R158) is shunted across

Signal switching

Signal switching for DCV and OHMS is done by the DCV & Ohms Switching circuit. FETs
Q113, Q105, Q104, and Q108 connect the DCV or ohms signal to the X1 buf fer (Q137, U167,
and U166). (See Analog signal switching states at the end of this section for a summary of
switching states of these FETs for the various DCV and OHMS ranges.)

Note that the reference current for OHMS is generated by the Ohms I-Source circuit. For 4­wire ohms measurements, SENSE LO is connected to the circuit by controlling U163.

Signal switching and gain for ACV, FREQ, and ACA is done by the AC Switching & Gain
circuit, which is primarily made up of K102, U102, U103, U105, U112, U118, U111, and U110.
(See Analog signal switching states.) Note that U111 is used for frequency adjustment. The
states of these analog switches vary from range to range.

Multiplexer and A/D converter

All input signals, except FREQ, are routed to the A/D MUX & Gain circuit. The multiplexer
(U163) switches the various signals for measurement. In addition to the input signal, the multi­plexer also switches among reference and zero signals at v arious phases of the measurement c y­cle.

When the input signal is selected by the MUX, it is amplified by a composite operational am­plifier made up of Q156 and U177. Tables in Analog signal switching states at the end of this
section provide the switch states of U176, which determine the gain for Q156 and U177.

The multiplexed signals of the measurement cycle are routed to the A/D Converter (U165),
where it converts the analog signals to digital form. The digital signals are then routed through
an opto-isolator to the MPU to calculate a reading.

4-10 Troubleshooting

T roubleshooting

Troubleshooting information for the v arious circuits is summarized below. See Analog signal

switching states for additional information regarding the analog circuitry.

Display board checks

If the front panel DISP test indicates that there is a problem on the display board, use Table

4-2. See Principles of operation for display circuit theory.

Table 4-2

Display board checks

Step Item/component Required condition Remarks

1

Front panel DISP test.

2

P1005, pin 5

3

P1005, pin 9

4

U401, pin 1

5

U401, pin 43

6

U401, pin 32

7

U401, pin 33

Verify that all segments operate.
+5V ±5%
+37V ±5%
Goes low briefly on power up,
then goes high.
4MHz square wave.
Pulse train every 1ms.

Brief pulse train when front
panel key is pressed.

Use front panel display test.
Digital +5V supply.
Display +37V supply.
Microcontroller RESET.

Controller 4MHz clock.
Control from main proces­sor.
Key down data sent to main
processor.

Power supply checks

Power supply problems can be checked using Table 4-3. See Principles of operation for cir­cuit theory on the power supply.

Table 4-3

Power supply checks

Step Item/component Required condition Remarks

Troubleshooting 4-11

Line fuse

1

Line voltage

2

Line power

3

U144, pin 2

4

U101, pin 7

5

U180, pin 3

6

U179, pin 3

7

U124, pin 3

8

CR141 cathode

9

CR139 anode

10

U180, pin 1

11

U179, pin 2

12

Q183, emitter

13

Check continuity.
120V/240V as required.
Plugged into live recepta­cle, power on.
+5V ±5%
+37V ±5%
+15V ±5%

-15.7V ±5%
+5V ±5%
+25V ± 20%

-25V ±20%
+18V ±20%

-18V ±20%
+21V ±5%

Remove to check.
Check power module position.
Check for correct power-up
sequence.
+5VD, referenced to Common D.
+37V, referenced to Common D.
+15V, referenced to Common A.

-15V, referenced to Common A.
+5VRL, referenced to Common A.
+25V, referenced to Common A.

-25V, referenced to Common A.
+18V, referenced to Common A.

-18V, referenced to Common A.
+20V, referenced to Common A.

4-12 Troubleshooting

Digital circuitry checks

Digital circuit problems can be checked using Table 4-4. See Principles of operation for a dig-

ital circuit description.

Table 4-4

Digital circuitry checks

Step Item/component Required condition Remarks

Power-on test

1

U157 pin 16

2

U157 pin 32

3

U135 pin 48

4

U135, lines A1-A23

5

U135, lines D1-D15

6

U135 pin 44

7

U159 pin 13

8

U159 pin 14

9

U158 pins 34-42

10

U158 pins 26-31

11

U158 pin 24

12

U158 pin 25

13

U135 pin 84

14

U135 pin 91

15

U135 pin 90

16

U135 pin 89

17

RAM OK, ROM OK.

Digital common.

+5V
Low on power-up, then goes
high.
Check for stuck bits.
Check for stuck bits.

14.7456MHz
Pulse train during RS-232 I/O.
Pulse train during RS-232 I/O.
Pulse train during IEEE-488 I/O.
Pulses during IEEE-488 I/O.
Low with remote enabled.
Low during interface clear.
Pulse train.
Pulse train.
Pulse train.
Pulse train.

Verify that RAM and ROM are
functional.
All signals referenced to digital
common.
Digital logic supply.
MPU RESET line.

MPU address bus.
MPU data bus.
MPU clock.
RS-232 RX line.
RS-232 TX line.
IEEE-488 data bus.
IEEE-488 command lines.
IEEE-488 REN line.
IEEE-488 IFC line.
ADRXB
ADTX
ADCLK
ADTS

Analog signal switching states

Tables 4-5 through 4-11 provide switching states of the various relays, FETs, and analog
switches for the basic measurement functions and ranges. These tables can be used to assist in
tracing an analog signal from the input to the A/D multiplexer.

Table 4-5

DCV signal switching

Range Q101 Q102 Q114 Q136 Q109 K101* Q113 Q105 Q104 Q108

OFF

OFF

OFF

ON

100mV
1V
10V
100V
1000V

ON
ON
ON
OFF
OFF

ON
ON
OFF
OFF

OFF
OFF
ON
ON

OFF
OFF
ON
ON

OFF
OFF
OFF
OFF

SET
SET
SET
SET
SET

Troubleshooting 4-13

OFF

ON

ON

OFF

OFF

ON

ON

OFF

OFF

ON

OFF

OFF

ON

OFF

OFF

OFF

ON

OFF

OFF

OFF

Sense
volts Q154 Q153

100mV
1V
10V

*K101 SET states: Pin 8 switched to Pin 7

OFF
OFF
OFF

OFF

OFF

OFF

OFF

OFF

OFF

Pin 3 switched to Pin 4

OFF

OFF

OFF

OFF
OFF
OFF

SET
SET
SET

ON
ON
ON

OFF
OFF

OFF
OFF

OFF
OFF

ON
ON

ON

OFF

OFF

OFF

Table 4-6

ACV and FREQ signal switching

Range Q101 Q102 K101* K102*

100mV
1V
10V
100V
750V

*K101 and K102 RESET states: Pin 8 switched to Pin 9

K101 and K102 SET states: Pin 8 switched to Pin 7

ON
ON
ON
ON
ON

ON
ON
ON
ON
ON

RESET
RESET
RESET
RESET
RESET

RESET
RESET
SET
SET
SET

Pin 3 switched to Pin 2

Pin 3 switched to Pin 4

U103
pin 8

ON
ON
OFF
OFF
OFF

U103
pin 9

ON
ON
OFF
OFF
OFF

U105
pin 9

OFF
OFF
ON
ON
ON

U105
pin 8

OFF
OFF
OFF
OFF
ON

U103
pin 16

OFF
ON
OFF
ON
OFF

U103
pin 1

ON
OFF
ON
OFF
OFF

U105
pin 1

ON
OFF
ON
OFF
OFF

ON
ON
ON

U111
pin 16

OFF
OFF
OFF
OFF
OFF

4-14 Troubleshooting

Table 4-7

Ω

2 signal switching

Range K104 Q101 Q102 Q114 Q136 Q109 K101* K102* Q113 Q105 Q104 Q108 Q153 Q167

OFF

ON

OFF

OFF

ON

10 Ω
100 Ω
1k Ω
10k Ω
100k Ω
1M Ω
10M Ω
100M Ω

*K101 set states: Pin 8 switched to Pin 7

K102 reset states: Pin 8 switched to Pin 9

RESET
RESET
RESET
RESET
RESET
RESET
RESET
RESET

ON

OFF

ON

ON

OFF

ON

ON

OFF

ON

ON

OFF

ON

ON

OFF

ON

ON

OFF

ON

ON

OFF

ON

ON

Pin 3 switched to Pin 4

Pin 3 switched to Pin 2

OFF

ON

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

OFF
OFF
OFF
OFF
OFF
OFF
ON
ON

SET
SET
SET
SET
SET
SET
SET
SET

RESET
RESET
RESET
RESET
RESET
RESET
SET
SET

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON
ON
ON
ON
ON
ON
ON

OFF
OFF
OFF
OFF
OFF
OFF
OFF

OFF
OFF
OFF
OFF
OFF
OFF
OFF

ON
ON
ON
ON
ON
OFF
OFF

OFF
OFF
OFF
OFF
OFF
OFF
OFF

Table 4-8

Ω

4 signal switching

Range K104

10 Ω
100 Ω
1k Ω
10k Ω
100k Ω
1M Ω
10M Ω
100M Ω

RESET
RESET
RESET
RESET
RESET
RESET
RESET
RESET

Q101Q102Q114Q136Q10

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

OFF

ON

ON

Dry
circuit

10 Ω
100 Ω

*K101 set states: Pin 8 switched to Pin 7

SET
SET

K102 reset states: Pin 8 switched to Pin 9

OFF

OFF

OFF

OFFONONONON

Pin 3 switched to Pin 4

Pin 3 switched to Pin 2

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

9

OFF
OFF
OFF
OFF
OFF
OFF
ON
ON

OFF
OFF

K101* K102*

SET
SET
SET
SET
SET
SET
SET
SET

RESET
RESET

RESET
RESET
RESET
RESET
RESET
RESET
SET
SET

RESET
RESETONON

Q113Q105Q104Q108Q153Q16

7

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

OFF

OFF

OFFONONONON

Table 4-9

Ω

2/

Ω

4 reference switching

Range U133 pin 8 U133 pin 1 Q123 Q125 Q124 Q126

Troubleshooting 4-15

10 Ω
100 Ω
1k Ω
10k Ω
100k Ω
1M Ω
10M Ω
100M Ω

Dry
circuit

10 Ω
100 Ω

Table 4-10

DCA signal switching

Range K103 Q165 Q164

10mA
100mA
1A
3A

OFF
ON
ON
OFF
ON
ON
OFF
OFF

ON
OFF

ON
ON
OFF
OFF

ON
OFF
OFF
ON
OFF
OFF
ON
ON

OFF
ON

ON
OFF
OFF
OFF

ON
ON
ON
OFF
OFF
OFF
OFF
OFF

ON
OFFONOFF

OFF
ON
ON
ON

ON
ON
ON
OFF
OFF
OFF
OFF
OFF

OFF
OFF
OFF
ON
ON
ON
ON
ON

OFFONOFF

OFF
OFF
OFF
ON
ON
ON
ON
ON

ON

Table 4-11

ACA signal switching

Range K103

1A
3A

(U163) to the final amplifier stage. These tables show the MUX lines (S3, S4, S6, S7) that are
selected for measurement during the SIGNAL phase of the multiplexing cycle. Also included
are switching states of analog switches (U176) that set up the gain for the final amplifier stage
(U177).

OFF
OFFONONONON

T ables 4-12 through 4-16 can be used to trace the analog signal through the A/D multiplexer

U105
pin 16

U105
pin 1

U111
pin 16

OFFONOFF

U105
pin 8

OFF

U103
pin 16

OFF
OFF

U103
pin 1

OFF
OFF

4-16 Troubleshooting

Table 4-12

DCV signal multiplexing and gain

Range

100mV
1V
10V
100V
1000V

Table 4-13

ACV and ACA signal multiplexing and gain

Range

All ON ON OFF X1 OFF

Table 4-14

DCA signal multiplexing and gain

Range

10mA
100mA
1A
3A

Signal
(U163)

S4
S4
S4
S4
S4

U176
pin 1

Signal
(U163)

S6
S6
S6
S6

U176
pin 1

OFF
OFF
OFF
OFF
OFF

U176
pin 8

U176
pin 1

OFF
OFF
OFF
OFF

U176
pin 8

OFF
OFF
ON
OFF
ON

U176
pin 9

U176
pin 8

OFF
OFF
OFF
OFF

U176
pin 9

OFF
ON
OFF
ON
OFF

Gain
(U177)

U176
pin 9

OFF
OFF
OFF
ON

Gain
(U177)

X100
X10
X1
X10
X1

U129
pin 1

Gain
(U177)

X100
X100
X100
X10

U129
pin 16

ON
OFF
OFF
OFF
OFF

U176
pin 16

ON
ON
ON
OFF

Table 4-15

Ω

2 signal multiplexing and gain

Troubleshooting 4-17

Range

10Ω
100Ω
1kΩ
10kΩ
100kΩ
1MΩ
10MΩ
100MΩ

Signal
(U163)

S4
S4
S4
S4
S4
S4
S4
S4

U176
pin 1

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

Table 4-16

Ω

4 signal multiplexing and gain

Range

10Ω
100Ω
1kΩ
10kΩ
100kΩ
1MΩ
10MΩ
100MΩ

Signal
(U163)

S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7
S4 then S7

U176
pin 1

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

U176
pin 8

OFF
OFF
OFF
OFF
OFF
ON
ON
ON

U176
pin 8

OFF
OFF
OFF
OFF
OFF
ON
ON
ON

U176
pin 9

OFF
OFF
ON
ON
ON
OFF
OFF
OFF

U176
pin 9

OFF
OFF
ON
ON
ON
OFF
OFF
OFF

Gain
(U177)

X100
X100
X10
X10
X10
X1
X1
X1

Gain
(U177)

X100
X100
X10
X10
X10
X1
X1
X1

U176
pin 16

ON
ON
OFF
OFF
OFF
OFF
OFF
OFF

U176
pin 16

ON
ON
OFF
OFF
OFF
OFF
OFF
OFF

Figure 4-3 provides a block diagram of the analog circuitry. Table 4-17 is provided to show
where the various switching devices are located in the block diagram.

Table 4-17

Circuit section locations for switching devices

Switching devices

Q101, Q102, Q153
Q114, Q136, Q109
K101, Q113, Q105, Q104, Q108, Q167
K102, U103, U105, U111
U133, Q123, Q125, Q124, Q126, Q120
K103, Q164, Q165
U163, U177, U176

Analog circuit section
(see Figure 4-3)

SSP (Solid State Protection)
DCV Divider
DCV & Ohms Switching
AC Switching & Gain
Ohms I-Source
Current Shunts
A/D Mux & Gain

4-18 Troubleshooting

No comm link error

A “No Comm Link” error indicates that the front panel processor has ceased communication
with the main processor, which is located on the mother board. This error indicates that there
may be a problem with the cable connection from the front panel display or one of the main pro­cessor ROMs may require re-seating in its socket. Check to be sure there is a proper cable con­nection from the front panel display. ROMs may be reseated as follows:

1. Turn of f the po wer, and disconnect the line cord and all other test leads and cables from
the instrument.

2. Remove the case cover as outlined in Section 5.

3. Find the two firmware ROMs, U156 and U157, located on the mother board. These are
the only ICs installed in sockets. (Refer to the component layout drawing at the end of
Section 6 for exact locations.)

4. Carefully push down on each ROM IC to make sure it is properly seated in its socket.

CAUTION Be careful not to push down excessively, or you might crack the mother

board.

5. Connect the line cord, and turn on the power. If the problem persists, additional trouble­shooting will be required.

5

Disassembly

5-2 Disassembly

Introduction

This section explains how to handle, clean, and disassemble the Model 2010 Multimeter. Dis-

assembly drawings are located at the end of this section.

Handling and cleaning

T o av oid contaminating PC board traces with body oil or other foreign matter , av oid touching
the PC board traces while you are repairing the instrument. Motherboard areas covered by the
shields have high-impedance de vices or sensitiv e circuitry where contamination could cause de­graded performance.

Handling PC boards

Observe the following precautions when handling PC boards:

• Wear cotton gloves.

• Only handle PC boards by the edges and shields.

• Do not touch any board traces or components not associated with repair.

• Do not touch areas adjacent to electrical contacts.

• Use dry nitrogen gas to clean dust off PC boards.

Solder repairs

Observe the following precautions when soldering a circuit board:

• Use an OA-based (organic activated) flux, and take care not to spread the flux to other
areas of the circuit board.

• Remove the flux from the work area when you ha ve finished the repair by using pure wa­ter with clean, foam-tipped swabs or a clean, soft brush.

• Once you have removed the flux, swab only the repair area with methanol, then blow­dry the board with dry nitrogen gas.

• After cleaning, allow the board to dry in a 50°C, lo w-humidity environment for several
hours.

Disassembly 5-3

Static sensitive devices

CMOS devices operate at very high impedance le vels. Therefore, an y static that b uilds up on
you or your clothing may be sufficient to destroy these de vices if the y are not handled properly.
Use the following precautions to avoid damaging them.

CAUTION Many CMOS devices are installed in the Model 2010. Handle all semicon-

ductor devices as being static sensitive.

• Transport and handle ICs only in containers specially designed to prevent static build­up. Typically, you will receive these parts in anti-static containers made of plastic or
foam. Keep these devices in their original containers until ready for installation.

• Remove the devices from their protective containers only at a properly grounded work
station. Also, ground yourself with a suitable wrist strap.

• Handle the devices only by the body; do not touch the pins.

• Ground any printed circuit board into which a semiconductor device is to be inserted to
the bench or table.

• Use only anti-static type desoldering tools.

• Use only grounded-tip solder irons.

• Once the device is installed in the PC board, it is normally adequately protected, and you
can handle the boards normally.

5-4 Disassembly

Assembly drawings

Use the following assembly drawings to assist you as you disassemble and re-assemble the
Model 2010. Also, refer to these drawings for information about the Keithley part numbers of
most mechanical parts in the unit. The drawings are located at the end of this section.

• Front Panel Assembly — 2010-040

• Chassis/Transformer Power Module Assembly — 2010-050

• Front Panel/Chassis Assembly — 2010-051

• Chassis Assembly — 2010-052

Case cover removal

Follow the steps below to remove the case cover to gain access to internal parts.

WARNING Before removing the case cover, disconnect the line cord and any test leads

1. Remove Handle — The handle serves as an adjustable tilt-bail. Adjust its position by
gently pulling it away from the sides of the instrument case and swinging it up or do wn.
To remove the handle, swing the handle below the bottom surface of the case and back
until the orientation arrows on the handles line up with the orientation arrows on the
mounting ears. W ith the arro ws lined up, pull the ends of the handle a way from the case.

2. Remove Mounting Ears — Remov e the screw that secures each mounting ear . Pull do wn
and out on each mounting ear.

Disassembly 5-5

from the instrument.

NOTE When re-installing the mounting ears, make sure to mount the right ear to the right

side of the chassis, and the left ear to the left side of the chassis. Eac h ear is marked
“RIGHT” or “LEFT” on its inside surface.

3. Remove Rear Bezel — To remove the rear bezel, loosen the two captive screws that se­cure the rear bezel to the chassis. Pull the bezel away from the case.

4. Removing Grounding Screws — Remo ve the two grounding scre ws that secure the case
to the chassis. They are located on the bottom of the case at the back.

5. Remove Cover — To remove the case, grasp the front bezel of the instrument, and care­fully slide the chassis forward. Slide the chassis out of the metal case.

NOTE T o gain access to the components under the motherboar d shields, r emo ve the shields,

which are secured to the motherboard by their appropriate screw.

5-6 Disassembly

Changing trigger link lines

The Model 2010 uses two lines of the T rigger Link rear panel connector as External Trigger
(EXT TRIG) input and Voltmeter Complete (VMC) output. At the factory, line 1 is configured
as VMC and line 2 as EXT TRIG.

NOTE Line 1, 3, or 5 of the T rigger Link can be confi gur ed as VMC, while line 2, 4, or 6 can

be configured as EXT TRIG.

You can change trigger link line configurations by moving the position of resistors inside the
unit. Perform the following steps to change trigger link lines:

WARNING Make sure the instrument is disconnected from the power line and other

equipment before performing the following procedure.

Figure 5-1

Trigger link connec­tors

1. Remove the cover from the instrument as explained in Case cover removal.

2. The resistors used to select the trigger link lines are located next to the T rigger Link con­nector as shown in Figure 5-1. The “resistors” are actually solder beads that bridge pc­board pads. If the factory default lines are selected, the solder beads will be located at
R270 (line 2, EXT TRIG) and R267 (line 1, VMC).

3. To change a trigger link line:

• Use a hot air pencil to remove the appropriate solder bead.

• Using a solder with OA-based flux, apply a solder bead to the appropriate resistor
location.

• Replace the cover on the instrument.

Mother Board

(view from top)

Trigger Link Lines

Line 1 = VMC (R267)
Line 2 = EXT TRIG (R270)
Line 3 = VMC (R266)
Line 4 = EXT TRIG (R268)
Line 5 = VMC (R265)
Line 6 = EXT TRIG (R269)

Solder

Bead

Trigger Link

Connector

R269
R268
R270
R265
R267
R266

Rear Panel

Motherboard removal

Perform the following steps to remov e the motherboard. This procedure assumes that the case

cover is already removed.

1. Remove the IEEE-488 and RS-232 fasteners.

The IEEE-488 and the RS-232 connectors each have two nuts that secure the connectors
to the rear panel. Remove these nuts.

2. Remove the front/rear switch rod.

At the switch, place the edge of a flat-blade screw driver in the notch on the pushrod.
Gently twist the screw driver while pulling the rod from the shaft.

3. Disconnect the front and rear input terminals.

You must disconnect these input terminal connections for both the front and rear inputs:

• INPUT HI and LO

• SENSE HI and LO

• AMPS

Disassembly 5-7

Remove all the connections except the front AMPS connection by pulling the wires off the

pin connectors. T o remov e the front panel AMPS input wire (white), first remove the AMPS fuse
holder, and then use needle-nose pliers to grasp the AMP wire near fuse housing. Push the wire
forward and down to snap the spring out of the fuse housing. Carefully pull the spring and con­tact tip out of housing.

During re-assembly, use the following table to identify input terminals:

Input terminals Front wire color Rear wire color

INPUT HI
INPUT LO
SENSE HI
SENSE LO
AMPS

4. Unplug cables:

• Unplug the display board ribbon cable from connector J1014.

• Unplug the transformer cables from connectors J1016 and J1015.

• Unplug the OPTION SLOT ribbon cable from connector J1017.

5. Remove the fastening scre w that secures the main PC board to the chassis. This scre w is

located along the left side of the unit towards the rear. It also holds down U144.
During re-assembly, replace the board, and start the IEEE-488 and RS-232 connector

nuts and the mounting screw. T ighten all the f asteners once they are all in place and the
board is correctly aligned.

6. Remove the motherboard, which is held in place by edge guides on each side, by sliding

it forward until the board edges clear the guides. Carefully pull the motherboard from
the chassis.

Red
Black
Yellow
Gray
White

White/Red
White/Black
White/Yellow
White/Gray
—

5-8 Disassembly

Front panel disassembly

Use the following procedures to remov e the display board and/or the pushbutton switch pad:

NOTE You must first remove the case cover, the front/rear input switch, and the front input

terminal wires as described in earlier in this section.

1. Unplug the display board ribbon cable from connector J1014.

2. Remove the front panel assembly.
This assembly has four retaining clips that snap onto the chassis over four pem nut studs.

Two retaining clips are located on each side of the front panel. Pull the retaining clips
outward and at the same time pull the front panel assembly forward until it separates
from the chassis.

3. Using a thin-bladed screw driv er , pry the plastic PC board stop (located at the bottom of
the display board) until the bar separates from the casing. Pull the display board from the
front panel.

4. Remove the switch pad by pulling it from the front panel.

Main CPU firmware replacement

Changing the firmware may be necessary as upgrades become available. The firmware revi­sion levels for the main and front panel CPUs are displayed during the po wer-on sequence. (The
main firmware revision level is displayed on the left; the front panel firmware revision level is
displayed on the right.) For example, REV: A01 A02 indicates a main firmw are revision le v el of
A01 and a front panel firmware revision level of A02.

The firmware for the main CPU is located in the EPROMs U156 (EVEN) and U157 (ODD),
leadless ICs that reside in chip carriers on the PC board. To replace the CPU firmware, perform
the following:

WARNING Disconnect the instrument from the power lines, and remove the test leads

before changing the firmware.

Disassembly 5-9

1. Remove the case cover as described earlier in this section.

2. Locate U156 EVEN and U157 ODD (EPROMs) on the main PC board. They are the
only devices installed in chip carriers (sockets).

CAUTION EPROMs U156 and U157 are static-sensitive devices. Be sure to follow the

handling precautions explained in Static sensitive devices.

3. Using an appropriate chip extractor, remove U156 from its chip carrier.

4. Position the new U156 EPROM on the appropriate chip carrier. Make sure the notched
corner of the chip is aligned with the notch in the chip carrier.

NOTE Be sure to install the correct EPROMs at the ODD and EVEN locations. The instru-

ment will not function if the EPROMs are installed in the wrong sockets.

5. With the EPROM properly positioned, push down on the chip until it completely seats
into the chip carrier.

6. Repeat steps 3 through 5 for EPROM U157.

7. After installation, make sure the instrument powers up normally before replacing the
cover.

5-10 Disassembly

Removing power components

The following procedures for removing the po wer transformer and/or power module require

that the case cover and motherboard be removed, as previously explained.

Power transformer removal

Perform the following steps to remove the power transformer:

1. Remove motherboard.

2. Unplug the transformer wires that attach to the power module at the rear panel.
During re-assembly, use drawing 2010-050 as a reference and replace the wires as fol-

lows:
Top wire: Gray

Right top: Violet
Right bottom: White
Left top: Red
Left bottom: Blue

3. Remove the two nuts that secure the transformer to the bottom of the chassis.

4. Pull the black ground wire off the threaded stud, and remov e the power transformer from
the chassis.

WARNING To avoid electrical shock, which could result in injury or death, the black

ground wire of the transformer must be connected to chassis ground. When
installing the power transformer , be sure to re-connect the black ground wire
to the mounting stud on bottom of the chassis.

Power module removal

Perform the following steps to remove the power module:

1. Remove motherboard.

2. Unplug the transformer wires that attach to the power module at the rear panel.
During re-assembly, use drawing 2010-050 as a reference, and replace the wires as fol-

lows:
Top wire: Gray

Right top: Violet
Right bottom: White
Left top: Red
Left bottom: Blue

Disassembly 5-11

3. Disconnect the power module's ground wire. This green and yellow wire connects to a
threaded stud on the chassis with a kep nut.

4. Squeeze the latches on either side of the power module while pushing the module from
the access hole.

WARNING To avoid electrical shock, which could result in injury or death, the ground

wire of the power module must be connected to chassis ground. When install­ing the power module, be sure to re-connect the green and yellow ground wire
to the threaded stud on the chassis.

5-12 Disassembly

Instrument re-assembly

Re-assemble the instrument by reversing the previous disassembly procedures. Make sure
that all parts are properly seated and secured and that all connections are properly made. To en­sure proper operation, replace and securely fasten the shield.

WARNING To ensure continued protection against electrical shock, verify that power

line ground (green and yellow wire attached to the power module) and the
power transformer ground (black wire) are connected to the chassis.

6

Replaceable

Parts

6-2 Replaceable Parts

Introduction

This section contains replacement parts information and component layout drawings for the
Model 2010.

Parts lists

The electrical parts lists for the Model 2010 are shown in Tables 4-1 to 4-3. For part numbers
to the various mechanical parts and assemblies, use the Miscellaneous parts list and the assem­bly drawings provided at the end of Section 5 and Tables 6-1 through 6-4.

Ordering information

T o place an order, or to obtain information concerning replacement parts, contact your Keithley
representative or the factory (see inside front co v er for addresses). When ordering parts, be sure to
include the following information:

• Instrument model number (Model 2010)

• Instrument serial number

• Part description

• Component designation (if applicable)

• Keithley part number

Replaceable Parts 6-3

Factory service

If the instrument is to be returned to Keithley Instruments for repair, perform the following:

• Call the Repair Department at 1-800-552-1115 for a Return Material Authorization
(RMA) number.

• Complete the service form at the back of this manual, and include it with the instrument.

• Carefully pack the instrument in the original packing carton.

• Write ATTENTION REP AIR DEPARTMENT and the RMA number on the shipping la­bel.

Component layouts

The component layouts are provided in the following pages:

• Motherboard: 2010-250, pages 1 and 2

• Connector board: 2010-250, pages 1 and 2

• Display board: 2010-110, pages 1 and 2

6-4 Replaceable Parts

Table 6-1

Mother board parts list

Circuit desig. Description Keithley part no.

AT101

C101,103,111,116,118,122,124,

128,133,135,136,138,139,142,
149,152,153,159-163,167-170,
173,174,178,180,183,186,187,
190,193,197,198,201-208,210,
212-218,221,223,225,227,230,

232,233,249,250,290,299
C102
C104
C105
C106
C107,117,147,151,182,185,191,

194,199,234,237,259,261-263,

279,280,282,283,285-287,291,

293,294
C109
C110,141,150,158,176,219,220,

222,224,226,272-275,278,289
C112,248
C113,114,119,123,126,245-247
C115
C120
C131,148
C132,140
C137
C145,240,260,300
C146
C156
C171,177
C175
C179,308,312
C209
C241,242,243,270
C251,258,295
C252,257,264,266,267,268,271
C253-256
C276,277,281,284
C288

IC, DUAL HIGH CMR/SPEED OPTO, HCPL-2631

CAP, .1UF, 10%, 25V, CERAMIC

CAP, .01UF, 10%,1000V,CERAMIC
CAP, 100UF, 20%, 63V, ALUM ELEC
CAP, .22UF, 20%, 400V FILM
CAP, 15P, 1%, 100V, CERAMIC
CAP, .1UF, 20%,50V, CERAMIC

CAP, 2.2UF, 20%, 63V, POLYCARB
CAP, 47P, 5%, 100V, CERAMIC

CAP, .01, 5%, 50V, NPO
CAP, 1000P, 10%, 100V, CERAMIC
CAP, .33UF, 20%, 63V, POLYCARBONATE
CAP, 270PF, 5%, 100V, CERAMIC
CAP, 1000UF, 20%, 50V, ALUM ELEC
CAP, 220PF, 10%, 100V, CERAMIC
CAP, 33PF, 5%, 100V, CERAMIC
CAP, 1000PF, 20%, 50V, CERAMIC
CAP, 2200UF, 20%, 16V, ALUM ELEC
CAP, 6800UF, -20+100%, 16V, ALUMINUM
CAP, 2200P, 10%, 100V, CERAMIC
CAP, 10UF,20%, 25V, TANTALUM
CAP, 100PF, 5%, 100V, CERAMIC
CAP, 22UF, 20%, 25V, TANTALUM
CAP, .01UF, 10%, 50V, CERAMIC
CAP, 100PF, 5%, 100V, CERAMIC
CAP, 47PF, 10%, 100V, CERAMIC
CAP, .15UF, 20%, 50V, CERAMIC
CAP, 470UF, 20%, 63V, ALUM ELEC
CAP, .1UF, 10%, 1000V, CERAMIC

IC-588

C-495-.1

C-64-.01
C-403-100
C-513-.22
C-512-15P
C-418-.1

C-480-2.2
C-465-47P

C-514-.01
C-451-1000P
C-482-.33
C-465-270P
C-469-1000
C-451-220P
C-465-33P
C-418-1000P
C-473-2200
C-313-6800
C-430-2200P
C-440-10
C-465-100P
C-440-22
C-491-.01
C-465-100P
C-451-47P
C-418-.15
C-477-470
C-64-.1

Replaceable Parts 6-5

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

C296,297
C298
C306,307

CR102,103
CR104
CR106
CR110,118
CR111,112,116,117,119,126,133

,134,142,143
CR120,122
CR121,123,127,128,131
CR132
CR135-141

E101,102

J1006
J1007
J1008
J1014
J1015
J1016
J1017
J1034

CAP, 47UF, ±20%, 25V, ALUM ELEC
CAP, 100PF, 2.5%, 630V, POLYPROPYLENE
CAP, 680PF, 10%, 1000V, CERAMIC

DIODE, BRIDGE, VM18
DIODE, SILICON, W04M
DIODE, BRIDGE PE05
DIODE, DUAL HSM-2822T31
DIODE, DUAL SWITCHING, BAV99L

DIODE, DUAL COMMON ANODE BAW56LT2
DIODE, SWITCHING, MMBD914
DIODE, HI-VOLTAGE, HV-15
DIODE, SWITCHING, MMSD914T19

SURGE ARRESTOR, CG3-1.5L

CONN, MICRODIN W/GND FINGERS
CONN, RT ANGLE, MALE, 9 PIN
CONN, RIGHT ANGLE, 24 PIN
CONN, HEADER STRAIGHT SOLDER PIN
CONNECTOR, HEADER
CONN, MALE, 5-PIN (MOLEX 42491)
CONNECTOR, HEADER STRAIGHT SOLDER PIN
CONN, MALE RT ANGLE, 32 PIN

C-314-47
C-405-100P
C-64-680P

RF-52
RF-46
RF-48
RF-95
RF-82

RF-98
RF-83
RF-76
RF-112

SA-4

CS-792
CS-761-9
CS-501
CS-368-16
CS-784-4
CS-784-5
CS-368-14
CS-456

K101,102,104
K103

L101-106
L107,108
L109,111
L110

LS101

Q101,102,153
Q103,112,128,130, 147,171,183
Q104,105,108,109,113,114,121,

123,124,126,135,136,159,167,

185,186,195
Q119

RELAY, MINATURE (DPDT) TQ2E-L2-5V
RELAY, MINI SIGNAL REL

FERRITE CHIP 600 OHM BLM32A07
CHOKE
CHOKE, 22UH
CHOKE, 100UH

BEEPER, 5V, 30MA, BRT1209P-06-C

TRANS, N-CHAN MOSFET, 2SK1412
TRANS, NPN, MMBT3904
TRANS, N CHANNEL JFET, SNJ132199

TRANS, P CHANNEL JFET, J270

RL-155
RL-163

CH-62
CH-61
CH-66-22
CH-14

EM-5

TG-276
TG-238
TG-294

TG-166

6-6 Replaceable Parts

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

Q125
Q129,141,166,172
Q137,138
Q140,188
Q142,148
Q143,149
Q144,150
Q145,146
Q151,168,169,175-178
Q154,155
Q156
Q160
Q162
Q163,189,191,192,196
Q164,165
Q184
Q187

R101,102
R104,105
R106
R109,134,329,382
R110,133
R111,122,140,165,182,190,200,

256,272,279,284,288,290,296,
298,299,358,380,391,398,408,

415,426
R112
R115
R117
R118,175,224,263,276,282, 295
R123
R127,135
R129
R130,164,183,186,191,193,315,

340
R137,143,152,154,177,230,343,

349,361-364, 402,424
R142
R145,156,161,178,184,187,213,2

48,257,321,322,351
R146

TRANS, SELECTED TG-128
TRANS, PNP, MMBT3906L
SELECTION, TG-225
TRANS, N-CHAN JFET, SST4393
TRANS, NPN COMP SILICON AMP, MPS8099
TRANS, PNP COMP SILICON AMP, MPS8599
TRANS, NPN SILICON, BC846BL
TRANS, PNP, BC 856BL
TRANS, N-MOSFET, VN0605T
TRANS, N-CHAN MOSFET, TN254ON8
TRANS, DUAL N-CHAN JFET, SNJ450H99
TRANS, NPN PAIR, LM394
TRANS, DUAL PNP, LS352
TRANS, PNP, BC860C
TRANS, N-CHAN MOSFET, IRF7101
TRANS, N CHANNEL FET, 2N4392
TRANS, P-CHAN, MMBFJ175

RES, 1M, 5%, 125MW, METAL FILM
RES, 549K, .1%, 1/4W, METAL FILM
RES, 11K, .1%, 1/10W, METAL FILM
RES, 1K, 1%, 125mW, METAL FILM
RES NET, 9K-1K, MICRO DIVIDER
RES, 1K, 1%, 100MW, THICK FILM

RES, 100K, 1%, 125mW, METAL FILM
RES, 1K, .1%, 1W, WIREWOUND
RES NET, 100K, 9.9M, METAL FILM
RES, 10K, 1%, 100MW, THICK FILM
RES, 73.2K, 1%, 100MW, THICK FILM
RES, 33.2K, 1%, 100MW, THICK FILM
RES, 215, 1%, 100MW, THICK FILM
RES, 100K, 1%, 100MW, THICK FILM

RES, 49.9K, 1%, 100MW, THICK FILM

RES, 10, 5%, 125MW, METAL FILM
RES, 100, 1%, 100MW, THICK FILM

RES, 1.1M, 5%, 125MW, METAL FILM

31841A
TG-244
182-600B
TG-263
TG-157
TG-158
TG-278
TG-287
TG-243
TG-274
TG-326
TG-142
TG-322
TG-323
TG-312
TG-128-1
TG-311

R-375-1M
R-315-549K
R-263-11K
R-391-1K
TF-246-2
R-418-1K

R-391-100K
R-249-1K
TF-251
R-418-10K
R-418-73.2K
R-418-33.2K
R-418-215
R-418-100K

R-418-49.9K

R-375-10
R-418-100

R-375-1.1M

Replaceable Parts 6-7

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

R147
R153
R155,169,339,387,388,427
R157,342
R158
R172
R185,372,385,398
R189
R194
R195
R196,212,217,220,221,264
R201,204,229,231,233, 238,244
R202,319,327,328,337,338,389,

390,433,445
R205
R214,218,422,441
R215
R216
R225,283
R226,228,235,237,245, 250,252,

255
R234
R241
R243,259,317,320
R246
R249
R261
R267,270
R271
R277
R278,281,297
R280,294
R287,459
R291,292
R300
R304
R318
R324,367
R325
R326,370
R330

RES, 732K, 1%, 100MW, THICK FILM
RES NET, 3.6K MICRO DIVIDER
RES, 4.99K, 1%, 100MW, THICK FILM
RES, 511, 1%, 100MW, THICK FILM
RES, .1, 1%, 2W, 4-TERMINAL MOLDED
RES, 1M, 1%, 100MW, THICK FILM
RES, 1K, 1%, 125mW, METAL FILM
RES, 6.65K, 1%, 125MW, METAL FILM
RES, 644, 1%, 3W, 300V, METAL FOIL
RES, 64.4K, 1%, 3W, 300V, METAL FOIL
RES, 2.21K, 1%, 100MW, THICK FILM
RES, 4.75K, 1%, 100MW, THICK FILM
RES, 10K, 1%, 100MW, THICK FILM

RES, 10, .5%, 1/8W, METAL FILM
RES, 2K, 1%, 100MW, THICK FILM
RES, 49.9K, 1%, 125MW, METAL FILM
RES, 2.49K, 1%, 125MW, METAL FILM
RES, 470, 5%, 125MW, METAL FILM
RES, 475, 1%, 100MW, THICK FILM

RES, 5.11K, 1%, 100MW, THICK FILM
RES, 34K, 1%, 100MW, THICK FILM
RES, 10, 10%, 100MW, THICK FILM
RES, 82.5, 1%, 100MW, THICK FILM
RES, 4.02K, 1%, 100MW, THICK FILM
RES, 200, 1%, 100MW, THICK FILM
RES, .0499, 1%, 100MW, THICK FILM
RES NET (SOIC)
RES, 66.5K, 1%, 100MW, THICK FILM
RES, 357, 1%, 100MW, THICK FILM
RES, 49.9, 1%, 100MW, THICK FILM
RES, 1.28M, .1%, 1/8W, METAL FILM
RES, 47.5K, 1%, 100MW, THICK FILM
RES, 6.04K, 1%, 125MW, THIN FILM
RES, 20K,1%,125MW, METAL FILM
RES, 73.2K, 1%, 100MW, THICK FILM
RES, 4.99K, 1%, 125mW, METAL FILM
RES, 200K, 1%, 125MW, METAL FILM
RES, 499, 1%, 125MW, METAL FILM
RES, 22K, 5%, 125MW, METAL FILM

R-418-732K
TF-246-1
R-418-4.99K
R-418-511
R-342-.1
R-418-1M
R-391-1K
R-391-6.65K
R-449-644
R-449-64.4K
R-418-2.21K
R-418-4.75K
R-418-10K

R-246-10
R-418-2K
R-391-2.87K
R-391-2.49K
R-375-470
R-418-475

R-418-5.11K
R-418-34K
R-418-10
R-418-82.5
R-418-4.02K
R-418-200
R-418-.0499
TF-245
R-418-66.5K
R-418-357
R-418-49.9
R-176-1.28M
R-418-47.5K
R-423-6.04K
R-391-20K
R-418-73.2K
R-391-4.99K
R-391-200K
R-391-499
R-375-22K

6-8 Replaceable Parts

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

R331
R332,365
R333,334,336
R335,400
R341,344
R345
R350
R353
R359
R360
R366,373
R368
R371,392,421
R384
R386
R405,407
R406
R412
R413
R414
R419
R423
R425,446
R428
R429
R430
R431
R444
R450

RES, 1.8M, 5%, 125MW, METAL FILM
RES, 499, 1%, 125MW, METAL FILM
RES, 2.49K, 1%, 125MW, METAL FILM
RES, 20, 1%, 100MW, THICK FILM
RES, 3.01K, 1%, 100MW, THICK FILM
RES, 511, 1%, 100MW, THICK FILM
RES, 75K, 1%, 100MW THICK FILM
RES, 332, 1%, 100MW, THICK FILM
RES, 3.01K, 1%, 125MW, METAL FILM
RES, 301, 1%, 100MW, THICK FILM
RES, 5K, .1%, WIREWOUND
RES, 169, .1%, 1/2W, 350V, METAL FILM
RES, 15k, 1%, 100MW, THICK FILM
RES, 24.9K, 1%, 100MW, THICK FILM
RES, .91, .1, 1/4W, WIREWOUND
RES, 560K, 5%, 250MW, METAL FILM
RES, 18.7, 1%, 125mW, METAL FILM
RES, 33, 5%, 250mW, METAL FILM
RES, 20K, 1%, 100MW, THICK FILM
RES, 2.2M, 10%, 1/2W, 1.5KV, METAL OXIDE
RES, 137, 1%, 125MW, METAL FILM
RES, 4.02K,1%,100MW, THICK FILM
RES, 49.9K, 1%, 100MW, THICK FILM
RES, 1.87K, .1%, 1/8W, METAL FILM
RES, 200, .1%, 1/10W, METAL FILM
RES, 100K, 1%, 100MW, THICK FILM
RES, 18K, .1%, 1/10W, METAL FILM
RES, 24K, 5%, 1W, 200V, THICK FILM
RES, 100, .1%, 1/10W, METAL FILM

R-375-1.8M
R-391-499
R-391-2.49K
R-418-20
R-418-3.01K
R-418-511
R-418-75K
R-418-332
R-391-3.01K
R-418-301
R-249-5K
R-94-169
R-418-15K
R-418-24.9K
R-95-.91
R-376-560K
R-391-18.7
R-376-33
R-418-20K
R-367-2.2M
R-391-121
R-418-4.02K
R-418-49.9K
R-377-1.87K
R-263-200
R-418-100K
R-263-18K
R-437-24K
R-263-100

S101

TP102-106

U101
U102,118
U103,105,111
U104,170,171
U106,109,121,130, 134,182
U107,108,172
U110
U112

SWITCH, PUSHBUTTON, 8 POLE

CONN,TEST POINT

IC, VOLTAGE REG LM317M
IC, J-FET, OP-AMP, TLE2081CD
IC, CMOS ANALOG SWITCH DG211DY
IC, MOSFET DRIVER, TLP591B
IC, 8 STAGE SHIFT/STORE, MC14094BD
IC, PHOTO, DARLINGTON TRANS
IC,TRMS TO DC CONVERTER, 637JR
IC, J-FET OP-AMP LF357M

SW-468

CS-553

IC-846
IC-967
IC-768
IC-877
IC-772
IC-911
IC-796
IC-966

Replaceable Parts 6-9

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

U114,168,173
U115,120
U116
U117,145
U123
U124
U131,178
U133,176
U135
U136
U137,184
U138
U139,166
U141
U142
U144
U146
U147,164,192
U148,153
U149
U150,155
U151,152
U154
U156
U157
U158
U159
U160
U161
U163
U165
U167
U174,177
U179
U180
U185
U187
U188,189
U190

IC, DUAL J-FET OP-AMP, OP-282GS
IC, QUAD COMPARATOR, LM339D
IC, DARLINGTON ARRAY, ULN2003L
IC, VOLT. COMPARATOR, LM311M
IC, DUAL PICOAMP OP-AMP AD706JR
IC, +5V REGULATOR, 500mA,7805
IC, VOLT COMPARATOR LM393D
IC, CMOS ANAL SWITCH, DG444DY
IC, 16BIT MICROPROCESSOR MC68306FC16
IC, SERIAL EPROM 24LC16B
IC, OP-AMP, AD744KR
INTEGRATED CIRCUIT, OPA177GS
IC, DUAL BIPOLAR OP-AMP, LT1124CS8
IC, PRECISION REFERENCE, LM399
IC, OP-AMP, NE5534D
IC, LOW DROPOUT REGULATOR, LM295T
IC,POS NAND GATES/INVERT, 74HCT14
IC, DUAL D-TYPE F/F, 74HC74
IC, QUAD 2 IN NOR, 74HCT02
IC, NCHAN LAT DMOS QUADFET, SD5400CY
IC, OPTOCOUPLER, 2601
IC, 32KX8 STAT CMOS RAM, D43256C
IC, QUAD D FLIP FLOP W/CLK, RESET 74HC175
PROGRAMMED ROM
PROGRAMMED ROM
IC, GPIB ADAPTER, 9914A
IC, +5V RS-232 TRANSCEIVER, MAX202
IC,OCTAL INTERFACE BUS, 75160
IC,OCTAL INTER BUS TRANS, 75161
IC, 8-CHAN ANA MULTIPLEXER, DG408DY
PROGRAMMED IC
IC, OP-AMP, LTC1050CS8
IC, OP-AMP, MC34081BD
IC, NEG VOLTAGE REG -15V, 500MA, 79M15
IC, POS VOLTAGE REG +15V, 500MA, 7815
IC, AJD SHUNT REGULATOR, TL431CLP
IC, PROGRAMMABLE, PRECISION-REF TL431CD
IC, PHOTO TRANS, TLP626BV-LFI
IC, OP-AMP, AD707

IC-968
IC-774
IC-969
IC-776
IC-910
IC-93
IC-775
IC-866
LSI-154
LSI-153
IC-1068
IC-960
IC-955
196-600A
IC-802
IC-962
IC-656
IC-773
IC-809
IC-893
IC-239
LSI-93-100
IC-923
2010-804-*
2010-803-*
LSI-123
IC-952
IC-646
IC-647
IC-844
2000-802-*
IC-791
IC-1058
IC-195
IC-194
IC-677
IC-1042
IC-1006
IC-712

6-10 Replaceable Parts

Table 6-1 (cont.)

Mother board parts list

Circuit desig. Description Keithley part no.

VR103,104
VR105,106
VR112,113
VR115,121
VR116,119
VR120,VR102
VR122
VR123,124
VR125,126

Y101
Y102

* Order same type as existing firmware revision level.

DIODE, ZENER, 6.8V, MMSZ5235BT1
DIODE, ZENER, 11V, MMSZ11T1
DIODE, ZENER, 6.2V, MMSZ6V2
DIODE, ZENER, 5.1V, BZX84C5V1
DIODE, ZENER, 3.3V, MMBZ5226BL
DIODE, ZENER, 6.2V, BZX84B6V2
DIODE, ZENER, 6.4V, IN4579
DIODE, ZENER, 12V, MMSZ11T1
DIODE, ZENER, 7.5V, BZX84C7V5

CRYSTAL, 14.7456MHZ
OSCILLATOR HIGH SPEED CMOS 12MHZ

DZ-100
DZ-103
DZ-97
DZ-88
DZ-94
DZ-87
DZ-73
DZ-112
DZ-110

CR-39
CR-37

Replaceable Parts 6-11

Table 6-2

Display board parts list

Circuit desig. Description Keithley part no.

C413
C401,402,411
C406,408
C414
C403-405,407,409,

410,412

CR401,402

DS401

P1014

R419
R405,408,410,412
R420,421
R413
R401-404,406,409,

411,415,416

U401
U402,403

Y401
* Order current firmware revision level.

CAP, 22UF, 20%, 6.3, TANTALUM
CAP, .1UF, 20%, 50V, CERAMIC
CAP, 33PF, 10%, 100V, CERAMIC
CAP, 47PF, 10%, 100V, CERAMIC
CAP, .1UF, 10%, 25V, CERAMIC

DIODE, MBR0520LT1

DISPLAY

CABLE ASSEMBL Y

RES, 10M, 5%, 125MW, METAL FILM
RES, 12.1, 1%, 125MW, METAL FILM
RES, 10K, 1%, 100MW, THICK FILM
RES, 13K, 1%, 100MW, THICK FILM
RES, 15K, 1%, 100MW, THICK FILM

PROGRAMMED ROM
IC, LATCHED DRIVERS, UCN-5812EPF-1
IC, 8-BIT MICROCON, MC68HC705C8P(PLCC)

CRYSTAL, 4MHZ

C-417-22
C-418-.1
C-451-33P
C-451-47P
C-495-.1

RF-103

DD-52

CA-123-16A

R-375-10M
R-391-12.1
R-418-10K
R-418-13K
R-418-15K

2000-800-*
IC-732
LSI-105

CR-36-4

Table 6-3

Connector board parts list

Circuit desig. Description Keithley part no.

C101
C302-305

J1034

P1017

R196

CAP, .1UF, 10%, 25V, CERAMIC
CAP, 47P, 5%, 100V, CERAMIC

CONN, MALE RT ANGLE, 32-PIN

CABLE ASSEMBL Y

RES, 2.21K, 1%, 100MW, THICK FILM

C-495-.1
C-465-47P

CS-456

CA-123-14A

R-418-2.21K