Keithley 2001 Multimeter Calibration Manual

Below you will find brief information for Multimeter 2001 2001. This manual covers the calibration procedures for your new Multimeter 2001 2001. It provides comprehensive information for the Model 2001 2001 including details on calibration, verification, and error reporting.

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Model 2001 Multimeter

Calibration Manual

2001-M-905-01 Rev. H / Mar 2011

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A G R E A T E R M E A S U R E O F C O N F I D E N C E

Model 2001 Multimeter

Calibration Manual

© 1992-2011, Keithley Instruments, Inc.

Cleveland, Ohio, U.S.A.

All rights reserved.

Reproduction and distribution of this technical manual is authorized for government purposes.

Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written approval of Keithley Instruments, Inc. is strictly prohibited.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley

Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.

The Lua 5.0 software and associated documentation files are copyright © 1994-2008, Tecgraf,

PUC-Rio. Terms of license for the Lua software and associated documentation can be accessed at the Lua licensing site (http://www.lua.org/license.html).

Document number: 2001-M-905-01 Rev. H / March 2011

Safety Precautions

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

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the product. Refer to the user documentation for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.

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 properly, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. 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, perform safe installations, and repair products. Only properly trained service personnel may perform installation and service procedures.

Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category I and

Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient over-voltages. Measurement Category II connections require protection for high transient over-voltages often associated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sources unless otherwise marked or described in the user documentation.

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. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product operators 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 1000V, no conductive part of the circuit may be exposed.

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, ensure that 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.

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.

For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.

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.

11/07

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 the 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 means caution, risk of danger. The user should refer to the operating instructions located in the user documentation in all cases where the symbol is marked on the instrument.

The symbol on an instrument means caution, risk of danger. Use standard safety precautions to avoid personal contact with these voltages.

The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.

The symbol indicates a connection terminal to the equipment frame.

If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be properly disposed of according to federal, state, and local laws.

The WARNING heading in the user documentation 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 the user documentation explains hazards that could damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.

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

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

To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the exterior of the instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no case or chassis (e.g., a 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.

11/07

1

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

1.5

1.6

1.7

1.8

1.1

1.2

1.3

1.4

2

2.1

2.2

2.3

2.4

2.5

2.5.1

2.5.2

2.5.3

2.6

2.6.1

2.6.2

2.6.3

2.7

Performance Verification

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

Environmental conditions .................................................................................................................................... 1-1

Warm-up period ................................................................................................................................................... 1-1

Line power ........................................................................................................................................................... 1-1

Recommended test equipment ............................................................................................................................. 1-2

Verification limits ................................................................................................................................................ 1-2

Restoring default conditions ................................................................................................................................ 1-2

Verification procedures........................................................................................................................................ 1-4

DC volts verification.................................................................................................................................... 1-4

AC volts verification.................................................................................................................................... 1-5

DC current verification .............................................................................................................................. 1-10

AC current verification .............................................................................................................................. 1-11

Resistance verification ............................................................................................................................... 1-13

Frequency accuracy verification ................................................................................................................ 1-16

Temperature reading checks ...................................................................................................................... 1-17

Calibration

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

Environmental conditions .................................................................................................................................... 2-1

Warm-up period ................................................................................................................................................... 2-2

Line power ........................................................................................................................................................... 2-2

Calibration lock.................................................................................................................................................... 2-2

Comprehensive calibration lock................................................................................................................... 2-2

Low-level calibration lock ........................................................................................................................... 2-2

IEEE-488 bus calibration lock status ........................................................................................................... 2-2

IEEE-488 bus calibration commands and program ............................................................................................. 2-2

Calibration commands ................................................................................................................................. 2-2

Required order of command execution........................................................................................................ 2-4

Example calibration command program ...................................................................................................... 2-4

Calibration errors ................................................................................................................................................. 2-5 i

2.7.1

2.7.2

2.8

2.8.1

2.8.2

2.8.3

2.9

2.9.1

2.9.2

2.10

2.10.1

2.10.2

2.10.3

2.10.4

Front panel error message summary.............................................................................................................2-5

IEEE-488 bus error reporting .......................................................................................................................2-6

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

Recommended equipment for comprehensive calibration ...........................................................................2-6

Front panel comprehensive calibration ........................................................................................................2-6

IEEE-488 bus comprehensive calibration ....................................................................................................2-9

AC self-calibration .............................................................................................................................................2-12

Front panel AC calibration .........................................................................................................................2-12

IEEE-488 bus AC self-calibration..............................................................................................................2-12

Low-level calibration..........................................................................................................................................2-12

Recommended equipment for low-level calibration ..................................................................................2-13

Low-level calibration summary..................................................................................................................2-13

Front panel low-level calibration procedure...............................................................................................2-15

IEEE-488 bus low-level calibration procedure ..........................................................................................2-18

3

3.3.6

3.3.7

3.3.8

3.3.9

3.3.10

3.4

3.4.1

3.5

3.1

3.2

3.3

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.5.1

3.5.2

3.6

3.6.1

3.6.2

Calibration Command Reference

Introduction .........................................................................................................................................................3-1

Command summary..............................................................................................................................................3-1

:CALibration:PROTected subsystem ...................................................................................................................3-3

:LOCK ..........................................................................................................................................................3-3

:SWITch?......................................................................................................................................................3-3

:SAVE...........................................................................................................................................................3-4

:DATA? ........................................................................................................................................................3-4

:DATE ..........................................................................................................................................................3-5

:DATE?.........................................................................................................................................................3-5

:NDUE..........................................................................................................................................................3-5

:NDUE? ........................................................................................................................................................3-6

:LLEVel........................................................................................................................................................3-6

:DC ...............................................................................................................................................................3-9

:CALibration:UNPRotected Subsystem.............................................................................................................3-12

:ACCompensation ......................................................................................................................................3-12

Bus error reporting .............................................................................................................................................3-13

Calibration error summary .........................................................................................................................3-13

Detecting calibration errors ........................................................................................................................3-13

Detecting calibration step completion ................................................................................................................3-13

Using the *OPC? query ..............................................................................................................................3-13

Using the *OPC command .........................................................................................................................3-14

Appendices

Model 2001 Specifications ..................................................................................................................................A-1

Calibration Programs........................................................................................................................................... B-1

Calibration Messages........................................................................................................................................... C-1

Alternate Calibration Sources .............................................................................................................................D-1 ii

Performance Verification

1.1 Introduction

The procedures in this section are intended to verify that

Model 2001 accuracy is within the limits stated in the instrument one-year specifications. These procedures can be performed when the instrument is first received to ensure that no damage or misadjustment has occurred during shipment.

Verification may also be performed whenever there is a question of instrument accuracy, or following calibration, if desired.

NOTE

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

Extended Warranty

Additional years of warranty coverage are available on many products. These valuable contracts protect you from unbudgeted service expenses and provide additional years of protection at a fraction of the price of a repair. Extended warranties are available on new and existing products. Contact your local Keithley Instruments representative for details.

1.2

Environmental conditions: Covers the temperature and humidity limits for verification.

1.3

Warm-up period:

Describes the length of time the

Model 2001 should be allowed to warm up before testing.

1.4

Line power:

Covers power line voltage ranges during testing.

1.5

Recommended equipment:

Summarizes recommended equipment and pertinent specifications.

1.6

Verification limits:

Explains how reading limits were calculated.

1.7

Restoring factory default conditions:

Gives step-bystep procedures for restoring default conditions before each test procedure.

1.8

Verification procedures:

Details procedures to verify measurement accuracy of all Model 2001 measurement functions.

1.2 Environmental conditions

Verification measurements should be made at an ambient temperature of 18-28°C (65-82°F), and at a relative humidity of less than 80% unless otherwise noted.

This section includes the following:

1.3 Warm-up period

The Model 2001 must be allowed to warm up for at least one hour before performing the verification procedures. If the in-

1-1

Performance Verification

strument has been subjected to temperature extremes (outside the range stated in paragraph 1.2), allow additional time for internal temperatures to stabilize. Typically, it takes one additional hour to stabilize a unit that is 10°C (18°F) outside the specified temperature range.

The calibration equipment should also be allowed to warm up for the minimum period specified by the manufacturer.

1.4 Line power

The Model 2001 should be tested while operating from a line voltage in the range of 90-134V or 180-250V at a frequency of 50, 60, or 400Hz.

1.5 Recommended test equipment

Table 1-1 lists all test equipment required for verification.

Alternate equipment may be used as long as that equipment has specifications at least as good as those listed in the table.

See Appendix D for a list of alternate calibration sources.

1.6 Verification limits

1.7 Restoring default conditions

Before performing each performance verification procedure, restore instrument bench default conditions as follows:

1. From the normal display mode, press the MENU key.

The instrument will display the following:

MAIN MENU

SAVESETUP GPIB CALIBRATION

2. Select SAVESETUP, and press ENTER. The following will be displayed:

SETUP MENU

SAVE RESTORE POWERON RESET

3. Select RESET, and press ENTER. The display will then appear as follows:

RESET ORIGINAL DFLTS

BENCH GPIB

4. Select BENCH, then press ENTER. The following will be displayed:

RESETTING INSTRUMENT

ENTER to confirm; EXIT to abort

5. Press ENTER again to confirm instrument reset.

they do not include test equipment tolerance. If a particular and pertinent calibration equipment specifications.

DC voltage:

190mV: ±11ppm

1.9V: ±5ppm

19V: ±5ppm

190V: ±7ppm

1000V: ±9ppm

AC voltage, 10Hz-1MHz (40Hz-20kHz specifications):

190mV: ±150ppm

1.9V: ±78ppm

19V: ±78ppm

190V: ±85ppm

DC current:

190µA: ±102ppm

1.9mA: ±55ppm

19mA: ±55ppm

190mA: ±65ppm

1.9A: ±96ppm

1-2

Performance Verification

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Recommended equipment for performance verification

Mfg.

Model Description Specifications*

Fluke 5700A Calibrator AC current, 40Hz-10kHz (40Hz-1kHz specifications):

190µA: ±245ppm

1.9mA: ±160ppm

19mA: ±160ppm

190mA: ±170ppm

1.9A: ±670ppm

Resistance:

19¾: ±26ppm

190¾: ±17ppm

1.9k¾: ±12ppm

19k¾: ±11ppm

190k¾: ±13ppm

1.9M¾: ±19ppm

19M¾: ±47ppm

100M¾: ±120ppm

AC voltage, 1kHz-10kHz: 750V: ±85ppm

190mV, 1.9V @ 2MHz, ±0.1%

Fluke

5725A Amplifier

5700A-03 Wideband AC option

Fluke 5440A-7002 Low thermal cable set

Keithley CA-18-1 Low capacitance cable

Keithley R-289-1G

Keithley 3940

General

Radio



1433-T



1G¾ resistor

Low capacitance dual banana to dual banana shielded cable (for

ACV), 1.2m (4 ft.) in length.

NOTE: Resistor should be characterized to within ±10,000 ppm and mounted in shielded test box (see procedure).

Metal component box (for

1G¾ resistor)

Insulated banana plugs (2)

(for test box)

Multifunction Synthesizer 1Hz-15MHz, ±5ppm

Precision Decade Resistance Box

10-400¾, ±0.02%

Megohmmeter 1G¾, ±1%

* 90-day calibrator specifications shown include total uncertainty at specified output. The 1.9V output includes 0.5ppm transfer uncertainty. See Appendix

D for recommendation on alternate calibration sources.

1-3

Performance Verification

1.8 Verification procedures

The following paragraphs contain procedures for verifying instrument accuracy specifications for the following measuring functions:

• DC volts

• AC volts

• DC current

• AC current

• Resistance

• Frequency

• Temperature

If the Model 2001 is out of specifications and not under warranty, refer to the calibration procedures in Section 2.

WARNING

The maximum common-mode voltage

(voltage between INPUT LO and chassis 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.

NOTE

Do not connect test equipment to the Model 2001 through a scanner.

1.8.1 DC volts verification

DC voltage accuracy is verified by applying accurate DC voltages from a calibrator to the Model 2001 input and verifying that the displayed readings fall within specified ranges.

Follow the steps below to verify DCV measurement accuracy.

CAUTION

Do not exceed 1100V peak between IN-

PUT HI and INPUT LO, or instrument damage may occur.

1. Turn on the Model 2001 and the calibrator, and allow a one-hour warm-up period before making measurements.

NOTE

Use shielded, low-thermal connections when testing the 200mV range to avoid errors caused by noise or thermal offsets.

Connect the shield to calibrator output

LO. (See Table 1-1.)

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-1. Be sure to connect calibrator HI to Model

2001 INPUT HI and calibrator LO to Model 2001 IN-

PUT LO as shown.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Set digital filter averaging as follows:

A. From normal display, press CONFIG then DCV.

B. Select FILTER, then press ENTER.

C. Select AVERAGING, then press ENTER.

D. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

E. Press EXIT as necessary to return to normal display.

F. If the FILT annunciator is off, press FILTER to enable the filter.

5. Select the Model 2001 200mV DC range.

NOTE

Do not use auto-ranging for any of the verification tests because auto-range hysteresis may cause the Model 2001 to be on an incorrect range.

6. Set the calibrator output to 0.000000mVDC, and allow the reading to settle.

7. Enable the Model 2001 REL mode. Leave REL enabled for the remainder of the DC volts verification test.

8. Set the calibrator output to +190.0000mVDC, and allow the reading to settle.

9. Verify that the Model 2001 reading is within the limits

summarized in Table 1-2.

10. Repeat steps 8 and 9 for the remaining ranges and volt-

ages listed in Table 1-2.

11. Repeat the procedure for each of the ranges with negative voltages of the same magnitude as those listed in

Table 1-2.

1-4

Performance Verification

Model 2001

PREV

DISPLAY

NEXT

POWER

INPUT

+1. 900000 VDC

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Output HI

Input

Output

Note: Use shielded, low-thermal cables

when testing 200mV range. Use

internal Guard (EX GRD LED is off).

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Connections for DC volts verification

5700A Calibrator (Output DC Voltage)

Ground link installed.

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Limits for DC volts verification

2001

DCV range

Applied DC voltage

Reading limits

(18° to 28°C, 1 year)

200mV

20V

200V

1000V

190.0000mV

1.900000V

19.00000V

190.0000V

1000.000V

189.9918mV to 190.0082mV

1.899949V to 1.900052V

18.99946V to 19.00054V

189.9922V to 190.0078V

999.953V to 1000.047V

Notes:

1. Repeat procedure for negative voltages.

2. Reading limits shown do not include calibrator uncertainty.

1.8.2 AC volts verification

AC voltage accuracy is checked by applying accurate AC voltages at specific frequencies from an AC calibration source and then verifying that each Model 2001 AC voltage reading falls within the specified range. The three ACV verification procedures that follow include:

• Normal mode

• Low-frequency mode

• Peak ACV

CAUTION

Do not exceed 1100V peak or 2



V•Hz between INPUT HI and IN-

PUT LO, or instrument damage may occur.

Normal mode

1. Turn on the Model 2001, calibrator, and amplifier, and allow a one-hour warm-up period before making measurements.

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-2. Be sure to connect the amplifier HI to Model

2001 INPUT HI, and amplifier LO to Model 2001 IN-

PUT LO as shown. Connect the power amplifier to the calibrator using the appropriate connector on the rear of the calibrator.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Select the ACV function and the 200mV range on the

Model 2001, and make sure that REL is disabled.

NOTE

Do not use REL to null offsets when performing AC volts tests.

5. Set the calibrator output to 190.000mVAC at a frequency of 20Hz, and allow the reading to settle.

6. Verify that the Model 2001 reading is within the limits

summarized in Table 1-3.

7. Repeat steps 5 and 6 for 190mVAC at the remaining fre-

quencies listed in Table 1-3 (except 2MHz).Verify that

instrument readings fall within the required limits listed in the table.

8. Repeat steps 5 through 7 for the 2V, 20V, 200V, and

750VAC ranges, using the input voltages and limits stat-

ed in Table 1-3.

9. Connect the Model 2001 to the wideband calibrator output (Figure 1-3).

1-5

Performance Verification

10. Set the calibrator output to 190.0000mV at a frequency of 2MHz.

11. Verify that the reading is within limits stated in Table 1-

12. Repeat steps 10 and 11 for 1.900V input on the 2V range.

Low-frequency mode

1. Turn on the Model 2001, calibrator, and amplifier, and allow a one-hour warm-up period before making measurements.

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-2. Be sure to connect the amplifier HI to Model

2001 INPUT HI, and amplifier LO to Model 2001 IN-

PUT LO as shown. Connect the power amplifier to the calibrator using the appropriate connector on the rear of the calibrator.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Select the ACV function and the 200mV range on the

Model 2001, and make sure that REL is disabled.

NOTE

Do not use REL to null offsets when performing AC volts tests. Also, do not enable the filter.

5. Select the low-frequency mode as follows:

A. Press CONFIG ACV, select AC-TYPE, then press

ENTER.

B. Select LOW-FREQ-RMS, then press ENTER.

C. Press EXIT as required to return to normal display.

6. Set the calibrator output to 190.000mVAC at a frequency of 10Hz, and allow the reading to settle.

7. Verify that the Model 2001 reading is within the limits

summarized in Table 1-4.

8. Repeat steps 6 and 7 for 190mVAC at the remaining frequencies listed in the table.

9. Repeat steps 6 through 8 for the 2V, 20V, 200V, and

750VAC ranges, using the input voltages and limits stat-

ed in Table 1-4.

CAUTION

Do not apply more than 400V at 50kHz,

80V at 250kHz, 40V at 500kHz, or 20V at 1MHz, or instrument damage may occur.

5725 Amplifier (Connect to calibrator)

PREV

DISPLAY

NEXT

POWER

Model 2001

SENSE

Ω 4 WIRE

INPUT

1. 900000 VAC RMS

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV

REL TRIG

INFO LOCAL

DCI ACI

Ω2 Ω4

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Output HI

Input

Output

5700A Calibrator (Output AC Voltage)

CA-18-1 Lowcapacitance cable

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

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Connections for AC volts verification (all except 2MHz test)

1-6

Performance Verification

5725 Amplifier (Connect to calibrator)

BNC to dual banana

Ω terminator

Model 2001

SENSE

Ω 4 WIRE

INPUT

1. 900000 VAC RMS

350V

PEAK

1100V

PEAK

PREV

DISPLAY

NEXT

POWER

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Ω Coax

5700A Calibrator (Output AC Voltage)

Wideband output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

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Connections for AC volts verification (2MHz frequency only)

1-7

Performance Verification

1-8

Performance Verification

AC peak mode

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Limits for low-frequency mode AC voltage verification

Applied voltage

190mV

Allowable readings

(1 year, 18° to 28°C)

2001 ACV range

200mV

20V

200V

750V

1.9V

19V

190V

750V

10Hz

189.837mV

190.163mV

1.89837V

1.90163V

18.9818V

19.0182V

189.811V

190.189V

—

50Hz

189.875mV

190.125mV

1.89875V

1.90125V

18.9856V

19.0144V

189.849V

190.151V

748.72V

751.28V

100Hz

189.875mV

190.125mV

1.89875V

1.90125V

18.9856V

19.0144V

189.849V

190.151V

748.72V

751.28V

NOTE: Specifications above 100Hz are the same as normal mode. Limits shown do not include calibrator uncertainty.

1. Turn on the Model 2001, calibrator, and amplifier, and allow a one-hour warm-up period before making measurements.

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-2. Be sure to connect the amplifier HI to Model

2001 INPUT HI, and amplifier LO to Model 2001 IN-

PUT LO as shown. Connect the power amplifier to the calibrator using the appropriate connector on the rear of the calibrator.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Select the ACV function and the 200mV range on the

Model 2001, and make sure that REL is disabled.

NOTE

Do not use REL to null offsets when performing AC volts tests. Use AC coupling for 5kHz-1MHz tests. Use AC+DC coupling for 20Hz tests. (Use CONFIG-ACV to set coupling.)

5. Select the AC peak and filter modes as follows:

A. Press CONFIG then ACV, select AC-TYPE, then press ENTER.

B. Select PEAK, then press ENTER.

C. Select FILTER, then press ENTER.

D. Select AVERAGING, then press ENTER.

E. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

F. Press EXIT as necessary to return to normal display.

G. If the FLT annunciator is off, press FILTER to enable the filter.

6. Set the calibrator output to 100.000mVAC at a frequency of 5kHz, and allow the reading to settle.

7. Verify that the Model 2001 reading is within the limits

summarized in Table 1-5.

8. Repeat steps 6 and 7 for 100mVAC at the remaining frequencies listed in the table.

9. Repeat steps 6 through 8 for the 2V, 20V, 200V, and

750VAC ranges, using the input voltages and limits stat-

ed in Table 1-5.

CAUTION

Do not apply more than 400V at 50kHz,

80V at 250kHz, 40V at 500kHz, or 20V at 1MHz, or instrument damage may occur.

10. Set input coupling to AC+DC, then repeat the procedure for a 20Hz input signal.

1-9

Performance Verification

q~ÄäÉ=NJR

Limits for AC peak voltage verification

Allowable Readings (1 year, 18° to 28°C)

2001

ACV range

Applied voltage* 20Hz†

200mV 100mV 139.9mV

142.9mV

2V 1V 1.407V

1.421V

20V

200V

750V

10V

190V

750V

13.99V

14.29V

267.8V

269.6V



5kHz

139.9mV

142.9mV

1.407V

1.421V

13.98V

14.30V

267.8V

269.6V

1054V to

1067V

25kHz

139.9mV

142.9mV

1.407V

1.421V

13.98V

14.30V

267.7V

269.7V

1053V to

1068V

50kHz 100kHz 250kHz 500kHz 750kHz

139.8mV

143.0mV

1.406V

1.422V

13.97V

14.31V

267.6V

269.8V

139.6mV

143.2mV

1.404V

1.424V

13.96V

14.32V

267.4V

270.0V

*Calibrator voltage is given as an RMS value. Model 2001 reading limits are peak AC values.

**CAUTION: Do not apply more than 2 10

V•Hz

†Use AC+DC input coupling for 20Hz tests only. (Use CONFIG-ACV to set coupling.)

NOTE: Limits shown do not include uncertainty calibrator.

138.6mV

144.2mV

1.394V

1.434V

13.86V

14.42V

136.5mV

146.3mV

1.373V

1.455V

13.65V

14.63V

132.2mV

150.6mV

1.330V

1.498V

13.22V

15.06V

1MHz

127.3mV

155.5mV

1.281V

1.547V

12.73V

15.55V

1.8.3 DC current verification

DC current accuracy is checked by applying accurate DC currents from a calibrator to the instrument AMPS input and then verifying that the current readings fall within appropriate limits.

Follow the steps below to verify DCI measurement accuracy.

CAUTION

Do not apply more than 2A, 250V to the

AMPS input, or the amps protection fuse will blow.

1. Turn on the Model 2001 and the calibrator, and allow a one-hour warm-up period before making measurements.

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-4. Be sure to connect calibrator HI to the

AMPS input, and connect calibrator LO to INPUT LO as shown.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Set digital filter averaging as follows:

A. From normal display, press CONFIG then DCI.

B. Select FILTER, then press ENTER.

C. Select AVERAGING, then press ENTER.

D. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

E. Press EXIT as necessary to return to normal display.

F. If the FILT annunciator is off, press FILTER to enable the filter.

5. Select the DC current function (DCI) and the 200µA range on the Model 2001.

6. Set the calibrator output to +190.0000µADC, and allow the reading to settle.

7. Verify that the Model 2001 reading is within the limits

summarized in Table 1-6.

8. Repeat steps 6 and 7 for the remaining currents listed in

Table 1-6.

9. Repeat the procedure for each of the ranges with nega-

tive currents of the same magnitude as those listed in Table 1-6.

1-10

Performance Verification

5700A Calibrator (Output DC Current)

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

19.00000 mADC

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG STORE RECALL FILTER MATH

INFO LOCAL CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input

Output HI

Amps

Output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

cáÖìêÉ=NJQ

Connections for DC current verification

q~ÄäÉ=NJS

Limits for DC current verification

2001 DCI range

Applied DC current

Reading limits

(1 year, 18° to 28°C)

200µA

2mA

20mA

200mA

190.0000µA

1.900000mA

19.00000mA

190.0000mA

1.900000A

189.9000µA to

190.1000µA

1.899200mA

1.900800mA

18.99200mA

19.00800mA

189.9010mA

190.0990mA

1.898200A

1.901800A

NOTES:

1. Repeat procedure for negative currents.

2. Reading limits shown do not include calibrator uncertainty.

1.8.4 AC current verification

AC current verification is performed by applying accurate

AC currents at specific frequencies and then verifying that

Model 2001 readings fall within specified limits.

Follow the steps below to verify ACI measurement accuracy.

CAUTION

Do not apply more than 2A, 250V to the

AMPS input, or the current protection fuse will blow.

1. Turn on the Model 2001 and the calibrator, and allow a one-hour warm-up period before making measurements.

2. Connect the Model 2001 to the calibrator, as shown in

Figure 1-5. Be sure to connect calibrator HI to the

AMPS input, and connect calibrator LO to INPUT LO as shown.

3. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

4. Select the AC current function and the 200µA range on the Model 2001.

5. Set the calibrator output to 190.000µA AC at a frequency of 40Hz, and allow the reading to settle.

6. Verify that the Model 2001 reading is within the limits

for the present current and frequency summarized in Table 1-7.

7. Repeat steps 4 and 5 for each frequency listed in Table

1-7.

8. Repeat steps 4 through 7 for the remaining ranges and

frequencies listed in Table 1-7.

1-11

Performance Verification

5700A Calibrator (Output AC Current)

Model 2001

SENSE

Ω 4 WIRE

INPUT

PREV

DISPLAY

NEXT

POWER

190.0000 µAAC RMS

2001 MULTIMETER

350V

PEAK

DCV ACV

REL TRIG

INFO LOCAL

DCI ACI

Ω2 Ω4

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

1100V

PEAK

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input

Output HI

Amps

Output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

cáÖìêÉ=NJR

Connections for AC current verification

q~ÄäÉ=NJT

Limits for AC current verification

Reading limits (1 year, 18° to 28°C)

2001 ACI range

Applied AC current 40Hz 100Hz

200µA

2mA

20mA

200mA

190.000µA

1.90000mA

19.0000mA

190.000mA

1.90000A

188.260µA to

191.740µA

1.88355mA

1.91645mA

18.8355mA

19.1645mA

188.355mA

191.645mA

1.88250A

1.91750A

Note: Reading limits shown do not include calibrator uncertainty.

189.560µA to

190.440µA

1.89657mA

1.90344mA

18.9657mA

19.0344mA

189.657mA

190.344mA

1.89556A

1.90444A

1kHz

189.210µA to

190.790µA

1.89742mA

1.90258mA

18.9742mA

19.0258mA

189.742mA

190.258mA

1.89390A

1.90610A

10kHz

189.020µA to

190.980µA

1.89742mA

1.90258mA

18.9742mA

19.0258mA

189.685mA

190.315mA

1.89105A

1.90895A

1-12

Performance Verification

1.8.5 Resistance verification

Resistance verification is performed by connecting accurate resistance values to the instrument and verifying that Model

2001 resistance readings are within stated limits.

Follow the steps below to verify resistance measurement accuracy.

CAUTION

Do not apply more than 1100V peak between INPUT HI and LO or more than

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

20¾ - 200k¾ range verification

1. Turn on the Model 2001 and the calibrator, and allow a one-hour warm-up period before making measurements.

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

3. Using shielded 4-wire connections, connect the Model

2001 to the calibrator, as shown in Figure 1-6. Be sure

to connect calibrator HI and LO terminals to the Model

2001 HI and LO terminals (including SENSE HI and

LO) as shown.

4. Restore Model 2001 factory default conditions, as explained in paragraph 1.7.

5. Set operating modes as follows:

A. From normal display, press CONFIG then ¾4.

B. Select FILTER, then press ENTER.

C. Select AVERAGING, then press ENTER.

D. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

E. Select OFFSETCOMP, then press ENTER.

F. Select ON, then press ENTER.

G. Press EXIT to return to normal display.

6. Set the calibrator to output 19.000¾, and allow the reading to settle. Verify that the reading is within the limits

stated in Table 1-8.

NOTE

Resistance values available in the Model

5700A calibrator may be slightly different than the stated nominal resistance values.

Calculated limits stated in Table 1-8

should be recalculated based on actual calibrator resistance values.

7. Set the calibrator output to 190.000¾, and allow the reading to settle.

8. Verify that the reading is within the limits stated in Table 1-8. (NOTE: Recalculate limits if calibrator resis-

tance is not exactly as listed.)

9. Repeat steps 11 and 12 for the 2k¾ through 200k¾ rang-

es using the values listed in Table 1-8. NOTE: Turn off-

set compensation off when testing the 200k¾ range (see step 5).

q~ÄäÉ=NJU

Limits for resistance verification (20¾-200M¾ ranges)

2001 ¾ range

Applied resistance

Reading limits

(1 year, 18° to 28°C)

20¾

200¾

2k¾

20k¾

200k¾

2M¾

20M¾

200M¾

19.0000¾

190.000¾

1.90000k¾

19.0000k¾

190.000k¾

1.90000M¾

19.0000M¾

100.000M¾

18.99849¾ to

19.00151¾

189.9880¾ to

190.0120¾

1.899897k¾ to

1.900103k¾

18.99897k¾ to

19.00103k¾

189.9820k¾ to

190.0180k¾

1.899687M¾ to

1.900313M¾

18.98281M¾ to

19.01719M¾

97.9800M¾ to

102.0200M¾

NOTES:

Limits shown do not include calibrator uncertainty and are based on absolute calibration values shown. Recalculate limits using Model

2001 specifications if calibrator resistance values differ from nominal values shown.

Use 4-wire connections and function for 20¾-200k¾ ranges. Use 2wire connections and function for 2M¾-200M¾ ranges.

1-13

Performance Verification

5700A Calibrator (Output 2-Wire Resistance)

Model 2001

SENSE

Ω 4 WIRE

INPUT

PREV

DISPLAY

NEXT

POWER

+1. 900000 k

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

350V

PEAK

1100V

PEAK

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Output HI

Input

Output

Note: Use shielded cable to minimize noise.

Disable calibrator external sense mode.

Use internal Guard (EX GRD LED is off).

cáÖìêÉ=NJS

Connections for resistance verification (20¾-200k¾ ranges)

Ground link installed.

2M¾ – 200M¾ range verification

1. Connect the DC calibrator and Model 2001 using the 2-

wire connections shown in Figure 1-7.

2. Set the calibrator to the 2-wire mode (external sense off).

3. Set operating modes as follows:

A. From normal display, press CONFIG then ¾2.

B. Select FILTER, then press ENTER.

C. Select AVERAGING, then press ENTER.

D. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

E. Press EXIT to return to normal display.

F. If the FILT annunciator is off, press FILTER to enable the filter.

4. Select the Model 2001 ¾2 function, and change to the

2M¾ range.

5. Set the calibrator to output 1.90000M¾, and allow the reading to settle.

6. Verify that the reading is within the limits for the 2M¾

range stated in Table 1-8. (NOTE: Recalculate limits if

actual calibrator resistance differs from value shown.)

7. Repeat steps 4 through 6 for the 20M¾ (output

19.0000M¾) and 200M¾ (output 100.000M¾) ranges.

1G¾ range verification

1. Mount the 1G¾ resistor and the banana plugs to the test

box, as shown in Figure 1-8. Be sure to mount the ba-

nana plugs with the correct spacing. The resistor should be completely enclosed in and shielded by the metal test box. The resistor LO lead should be electrically connected to the test box to provide adequate shielding.

2. Characterize the 1G¾ resistor to within ±10,000ppm or

better using an accurate megohmmeter (see Table 1-1).

Record the characterized value where indicated in Table

1-9. Also, compute the limits based on the value of R us-

ing the formula at the bottom of the table.

NOTE

The value of the 1G¾ resistor should not exceed 1.05G¾.

3. Set operating modes as follows:

A. From normal display, press CONFIG then ¾2.

B. Select FILTER, then press ENTER.

C. Select AVERAGING, then press ENTER.

D. Using the cursor and range keys, set the averaging parameter to 10 readings, then press ENTER.

E. Press EXIT to return to normal display.

F. If the FILT annunciator is off, press FILTER to enable the filter.

4. Select the 2-wire ohms function (¾2) and the 1G¾ range on the Model 2001.

5. Connect the 1G¾ resistor test box (from steps 1 and 2) to the INPUT HI and LO terminals of the Model 2001.

Allow the reading to settle.

6. Verify that the Model 2001 reading is within the limits

you calculated and recorded in Table 1-9.

1-14

Performance Verification

PREV

DISPLAY

NEXT

POWER

Sense HI

Model 2001

SENSE

Ω 4 WIRE

INPUT

190.0000 k

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

350V

PEAK

1100V

PEAK

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Input

Sense LO

Sense HI

Output HI

Output

Note: Use shielded cables to minimize noise.

Enable calibrator external sense mode.

Use internal Guard (EX GRD LED is off).

cáÖìêÉ=NJT

Connections for resistance verification (2M¾ - 200M¾ ranges)

Sense LO

5700A Calibrator (Output 4-wire Resistance)

Ground link installed.

Ω Resistor (Keithley part # R-289-1G)

Insulated

Plug

0.75"

Banana

Plugs

Non-insulated Plug

Metal

Test Box

Note: Resistor must be accurately characterized

before use (see text).

cáÖìêÉ=NJU

1G¾ resistor test box construction

q~ÄäÉ=NJV

Limits for resistance verification (1G¾ range)

Characterized resistor (R) Reading limit (1 year, 18° to 28°C)*

____________ G¾ _________G¾ to _________G¾

*1 Year limits = R ± (0.04R + 100,000)

Where R = characterized value of 1G¾ resistor.

1-15

Performance Verification

1.8.6 Frequency accuracy verification

Frequency accuracy verification is performed by connecting an accurate frequency source to the Model 2001 inputs, and then verifying that the frequency readings are within stated limits.

Use the procedure below to verify the frequency measurement accuracy of the Model 2001.

1. Connect the frequency synthesizer to the Model 2001

INPUT terminals, as shown in Figure 1-9.

2. Turn on both instruments, and allow a one-hour warmup period before measurement.

3. Set the synthesizer operating modes as follows:

FREQ: 1Hz

AMPTD: 5V p-p

OFFSET: 0V

MODE: CONT

FCTN: sine wave

4. Restore Model 2001 factory defaults, as explained in paragraph 1.7.

5. Press FREQ to place the Model 2001 in the frequency measurement mode.

6. Set maximum signal level to 10V as follows:

A. Press CONFIG then FREQ.

B. Select MAX-SIGNAL-LEVEL, then press ENTER.

C. Select VOLTAGE, then press ENTER.

D. Select 10V, then press ENTER.

E. Press EXIT to return to normal display.

7. Verify that the Model 2001 frequency reading is within

the limits shown in the first line of Table 1-10.

8. Set the synthesizer to each of the frequencies listed in

Table 1-10, and verify that the Model 2001 frequency

reading is within the required limits.

q~ÄäÉ=NJNM

Frequency verification limits

Synthesizer frequency

1Hz

10Hz

100Hz

1kHz

10kHz

100kHz

1MHz

10MHz

15MHz

Reading limits

(1 year, 18° to 28°C)

0.9997Hz to 1.0003Hz

9.997Hz to 10.003Hz

99.97Hz to 100.03Hz

0.9997kHz to 1.0003kHz

9.997kHz to 10.003kHz

99.97kHz to 100.03kHz

0.9997MHz to 1.0003MHz

9.997MHz to 10.003MHz

14.995MHz to 15.005MHz

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

1.0000 MHz

350V

PEAK

1100V

PEAK

DCV ACV DCI ACI

2001 MULTIMETER

Ω2 Ω4

FREQ TEMP

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

2A 250V

AMPS

500V

PEAK

CAL

BNC-to-Dual

Banana Plug

Adapter

Model 3940 Synthesizer

3940 MULTIFUNCTION SYNTHESIZER

Ω BNC Coaxial Cable

cáÖìêÉ=NJV

Connections for frequency accuracy verification

Main

Function

Output

1-16

Performance Verification

1.8.7 Temperature reading checks

When using thermocouples, the Model 2001 displays temperature by measuring the DC thermocouple voltage, and then calculating the corresponding temperature. Similarly, the instrument computes RTD temperature readings by measuring the resistance of the RTD probe and calculating temperature from the resistance value.

Since the instrument computes temperature from DCV and resistance measurements, verifying the accuracy of those

DCV and resistance measurement functions guarantees the accuracy of corresponding temperature measurements.

Thus, it is not necessary to perform a comprehensive temperature verification procedure if DCV and resistance verification procedures show the instrument meets its specifications in those areas. However, those who wish to verify that the

Model 2001 does in fact properly display temperature can use the following procedure to do so.

Selecting the temperature sensor

Follow the steps below to select the type of temperature sensor:

1. From normal display, press CONFIG then TEMP.

2. Select SENSOR, then press ENTER.

3. Select 4-WIRE RTD or THERMOCOUPLE as desired, then press ENTER.

4. Select the type of RTD probe or thermocouple you wish to test, then return to the CONFIG TEMPERATURE menu.

5. Select UNITS, then press ENTER.

6. Select DEG-C, then press ENTER.

7. Press EXIT as necessary to return to normal display.

8. Press the TEMP key to place the Model 2001 in the temperature display mode. Refer to further information below on how to check thermocouple and RTD probe readings.

Thermocouple temperature reading checks

To check thermocouple readings, simply apply the appropri-

ate DC voltage listed in Table 1-11 to the Model 2001 IN-

PUT jacks using a precision DC voltage source (such as the one used to verify DC voltage accuracy in paragraph 1.8.1), and check the displayed temperature reading. Be sure to use low-thermal cables for connections between the DC calibrator and the Model 2001 when making these tests.

NOTE

The voltages shown are based on a 0°C reference junction temperature. Use CON-

FIG TEMP to set the default reference junction temperature to 0°C.

q~ÄäÉ=NJNN

Thermocouple temperature reading checks

Thermocouple type

Applied DC voltage*

Displayed temperature (°C)

0.054mV

0.647mV

4.471mV

20.878mV

0.055mV

0.645mV

4.234mV

18.504mV

0.632mV

1.241mV

4.833mV

13.585mV

-4.215mV

0mV

1.277mV

5.268mV

42.283mV

-3.242mV

0mV

1.000mV

4.095mV

54.125mV

-3.089mV

0mV

0.992mV

4.277mV

20.252mV

-4.777mV

0mV

1.495mV

6.317mV

75.608mV

*Voltages shown are based on 0°C reference junction temperature. Use

CONFIG-TEMP menu to set default reference junction to 0°C.

-90.5 to -89.5

-0.5 to +0.5

24.5 to 25.5

99.5 to 100.5

749.5 to 750.5

-90.5 to -89.5

-0.5 to +0.5

24.5 to 25.5

99.5 to 100.5

1349.5 to 1350.5

-90.5 to -89.5

-0.5 to +0.5

24.5 to 25.5

99.5 to 100.5

389.5 to 390.5

-90.6 to -89.4

-0.6 to +0.6

24.4 to 25.6

99.4 to 100.6

989.4 to 990.6

7 to 13

97 to 103

497 to 503

1747 to 1753

7 to 13

97 to 103

497 to 503

1747 to 1753

355 to 365

495 to 505

995 to 1005

1795 to 1805

1-17

Performance Verification

RTD Temperature reading checks

Use a precision decade resistance box (see Table 1-1) to sim-

ulate probe resistances at various temperatures (Table 1-12).

Be sure to use 4-wire connections between the decade resistance box and the Model 2001.

q~ÄäÉ=NJNO

RTD probe temperature reading checks

RTD probe type

PT385

(=0.00385055)

PT3916

(=0.00392)

Applied resistance

64.30¾

100¾

109.73¾

138.51¾

313.71¾

63.68¾

100¾

109.90¾

139.16¾

266.94¾

Displayed temperature (°C)

-90.08 to -89.92

-0.08 to +0.08

24.92 to 25.08

99.92 to 100.08

599.86 to 600.14

-90.08 to -89.92

-0.08 to +0.08

24.92 to 25.08

99.92 to 100.08

449.86 to 450.14

1-18

Calibration

2.1 Introduction

This section gives detailed procedures for calibrating the

Model 2001. There are three types of calibration procedures:

• Comprehensive calibration

• AC self-calibration

• Low-level calibration

Comprehensive calibration requires accurate calibration equipment to supply precise DC voltages and resistance values. AC self-calibration requires no external equipment and can be performed at any time by the operator. Low-level calibration is normally performed only at the factory where the instrument is manufactured and is not usually required in the field.

NOTE

Low-level calibration is required in the field only if the Model 2001 has been repaired, or if the other calibration procedures cannot bring the instrument within stated specifications.

Section 2 includes the following information:

2.2

Environmental conditions: States the temperature and humidity limits for calibration.

2.3

Warm-up period: Discusses the length of time the

Model 2001 should be allowed to warm up before calibration.

2.4

Line power: States the power line voltage limits when calibrating the unit.

2.5

Calibration lock: Explains how to unlock calibration with the CAL switch.

2.6

IEEE-488 bus calibration commands and program:

Summarizes bus commands used for calibration, lists a simple calibration program, and also discusses other important aspects of calibrating the instrument over the bus.

2.7

Calibration errors: Details front panel error messages that might occur during calibration and also explains how to check for errors over the bus.

2.8

Comprehensive calibration: Covers comprehensive

(user) calibration from the front panel and over the

IEEE-488 bus.

2.9

AC self-calibration: Discusses the AC user calibration process, both from the front panel and over the

IEEE-488 bus.

2.10 Low-level calibration: Explains how to perform the low-level calibration procedure, which is normally required only at the factory.

2.2 Environmental conditions

Calibration procedures should be performed at an ambient temperature of 23°± 1°C, and at a relative humidity of less than 80% unless otherwise noted.

2-1

Calibration

2.3 Warm-up period

The Model 2001 must be allowed to warm up for at least one hour before calibration. If the instrument has been subjected to temperature extremes (outside the range stated in paragraph 2.2), allow additional time for internal temperatures to stabilize. Typically, it takes one additional hour to stabilize a unit that is 10°C (18°F) outside the specified temperature range.

The calibration equipment should also be allowed to warm up for the minimum period specified by the manufacturer.

2.5.2 Low-level calibration lock

To unlock low-level calibration, press in and hold the CAL switch while turning on the power. Low-level calibration can then be performed.

NOTE

Do not unlock low-level calibration unless you have the appropriate equipment and intend to perform low-level calibration.

See paragraph 2.10 for low-level calibration details.

2.4 Line power

The Model 2001 should be calibrated while operating from a line voltage in the range of 90-134V or 180-250V at 50, 60, or 400Hz.

2.5 Calibration lock

Calibration can be unlocked by pressing in on the front panel

CAL switch. Remove the sticker that covers the CAL switch access hole before calibration. Replace the sticker after completing calibration.

2.5.1 Comprehensive calibration lock

Before performing comprehensive calibration, you must first unlock calibration by momentarily pressing in on the recessed CAL switch. The instrument will display the following message:

CALIBRATION UNLOCKED

Comprehensive cal can now be performed

If you attempt comprehensive or low-level calibration without performing the unlocking procedure, the following message will be displayed:

CALIBRATION LOCKED

Press the CAL switch to unlock.

Note that it is not necessary to unlock calibration for the AConly self-calibration procedure.

If the CAL switch is pressed with calibration already unlocked, the following message will be displayed:

CAL ALREADY UNLOCKED

Cycle Power to relock cal switch.

2.5.3 IEEE-488 bus calibration lock status

You can determine the status of either calibration lock over the bus by using the appropriate query. To determine comprehensive calibration lock status, send the following query:

:CAL:PROT:SWIT?

The instrument will respond with the calibration lock status:

0: comprehensive calibration locked

1: comprehensive calibration unlocked

To determine the status of the low-level calibration lock, send the following query:

:CAL:PROT:LLEV:SWIT?

Responses to this lock query are:

0: low-level calibration locked

1: low-level calibration unlocked

Refer to paragraph 2.6.1 below and Section 3 for more details on calibration commands.

2.6 IEEE-488 bus calibration commands and program

2.6.1 Calibration commands

Table 2-1 summarizes calibration commands used to cali-

brate the instrument over the IEEE-488 bus (GPIB). For a complete description of calibration commands refer to Section 3.

2-2

Calibration

Table 2-1

IEEE-488 bus calibration command summary

Command Description

:CALibration

:PROTected

:LOCK

:SWITch?

:SAVE

:DATA?

:DATE “<string>”

:DATE?

:NDUE “<string>”

:NDUE?

:LLEVel

:SWITch?

:STEP <Step #>

:CALCulate

:DC

:ZERO

:LOW <value>

:HIGH <value>

:LOHM <value>

:HOHM <value>

:OPEN

:CALCulate

:UNPRotected

:ACCompensation

Calibration root command.

All commands in this subsystem are protected by the CAL switch.

Lock out calibration (opposite of enabling cal with CAL switch).

Request comprehensive CAL switch state.

(0 = locked; 1 = unlocked)

Save cal constants to EEPROM.

Download cal constants from 2001.

Send cal date to 2001.

Request cal date from 2001.

Send next due cal date to 2001.

Request next due cal date from 2001.

Low-level calibration subsystem.

Request low-level CAL switch state. (0 = locked; 1 = unlocked)

20V AC at 1kHz step.

20V AC at 30kHz step.

200V AC at 1kHz step.

200V AC at 30kHz

1.5V AC at 1kHz step.

0.2V AC at 1kHz step.

5mV AC at 100kHz step.

0.5mV AC at 1kHz step.

+2V DC step.

-2V DC step.

0V DC step.

20mA AC at 1kHz step.

+0.2A DC step.

+2A DC step.

2V AC at 1Hz step.

Calculate low-level cal constants.

User calibration subsystem.

Low-thermal short calibration step.

+2V DC calibration step.

+20V DC calibration step.

20k¾ calibration step.

1M¾ calibration step.

Open circuit calibration step.

Calculate DC cal constants.

All commands in this subsystem are not protected by CAL switch.

Perform user AC calibration (disconnect all cables)

NOTE: Upper case letters indicated short form of each command. For example, instead of sending “:CALibration:PROTected:LOCK”, you can send

“:CAL:PROT:LOCK”.

2-3

Calibration

2.6.2 Required order of command execution

When calibrating from the front panel, the Model 2001 will automatically prompt you in the correct order for various calibration steps. When calibrating over the IEEE-488 bus, however, the calibration sequence is determined by the order in which commands are received. Note that the Model 2001 must receive calibration commands in a specific order as covered below.

Comprehensive calibration

The following rules must be observed when sending bus commands to perform comprehensive calibration. These rules assume that comprehensive calibration has been enabled by pressing the CAL switch after instrument power is turned on.

1. The Model 2001 must execute all commands in the

:CAL:PROT:DC subsystem before the

:CAL:PROT:DC:CALC command will be executed.

Commands in the :CAL:PROT:DC subsystem can be sent in any order with the exception of the CALC command.

2. The Model 2001 must execute the following commands before it will execute the :CAL:PROT:SAVE command:

• All :CAL:PROT:DC subsystem commands.

• The :CAL:PROT:DATE command.

• The :CAL:PROT:NDUE command.

Low-level calibration

The following rules must be observed when sending commands to perform low-level calibration. These rules assume that low-level calibration has been enabled by pressing the

CAL switch while turning on instrument power.

1. The Model 2001 must execute all commands in the

:CAL:PROT:DC subsystem before the

:CAL:PROT:DC:CALC command will be executed.

Commands in the :CAL:PROT:DC subsystem can be executed in any order (except for CALC).

2. The Model 2001 must execute all commands in the

:CAL:PROT:DC subsystem, and it must execute the

:CAL:UNPR:AC command before it will execute any of the low-level commands.

3. There are a total of 15 low-level calibration steps, all of which must be executed before the

:CAL:PROT:LLEV:CALC command will be executed.

The 15 low-level calibration steps must be executed in order (step 1 through step 15).

Step 1 is always a valid next step, which allows you to restart the low-level calibration procedure at any time.

Similarly, the present step is always a valid next step, allowing you to repeat a calibration step if necessary. The next low-level step in numerical order is always valid.

4. The Model 2001 must execute the following commands before it will execute the :CAL:PROT:SAVE command:

• All :CAL:PROT:DC subsystem commands.

• The :CAL:UNPR:ACC command.

• All :CAL:PROT:LLEV subsystem commands.

• The :CAL:PROT:DATE command.

• The :CAL:PROT:NDUE command.

2.6.3 Example calibration command program

Program 2-1 below will allow you to type in calibration commands and send them to the instrument. If the command is a query, the information will be requested from the instrument and displayed on the computer screen. The program uses the

*OPC command to detect the end of each calibration step, as discussed in paragraph 3.6 in Section 3.

NOTE

See Appendix B for a summary of complete calibration programs.

Program requirements

In order to use this program, you will need the following:

• IBM PC, AT, or compatible computer.

• IOtech Personal488, CEC PC-488, or National Instruments PC-II or IIA IEEE-488 interface for the computer.

• Shielded IEEE-488 cable (Keithley Model 7007)

• MS-DOS or PC-DOS version 3.3 or later.

• Microsoft QuickBASIC, version 4.0 or later.

• IOtech Driver488 IEEE-488 bus driver, Rev. 2.3 or later. (NOTE: Later versions of Driver488 may not support other manufacturers’ interface cards.)

Program instructions

1. With the power off, connect the Model 2001 to the

IEEE-488 interface of the computer.

2. Turn on the computer and the Model 2001. Press in on the CAL switch to unlock calibration.

3. Make sure the Model 2001 is set for a primary address of 16. You can check or change the address as follows:

A. Press MENU, select GPIB, then press ENTER.

B. Select MODE, then press ENTER.

C. Select ADDRESSABLE, and press ENTER.

2-4

Calibration

D. If the address is set correctly, press EXIT as necessary to return to normal display.

E. To change the address, use the cursor and range keys to set the address to the desired value, then press

ENTER. Press EXIT as necessary to return to normal display.

4. Make sure that the IEEE-488 bus driver software is properly initialized.

5. Enter the QuickBASIC editor, and type in the example program. After checking for errors, press <Shift> +

<F5> to run it.

6. Type in the desired calibration command from the procedure (see paragraph 2.8.3), then press <Enter>.

2.7.1 Front panel error message summary

Table 2-2 summarizes front panel calibration error messages

that may occur because of improper connections or procedure.

NOTE

There are many more error messages that could occur because of internal hardware problems. Refer to Appendix C for a complete listing of all Model 2001 calibration error messages.

2.7 Calibration errors

The Model 2001 checks for errors when calibration constants are calculated, minimizing the possibility that improper calibration may occur due to operator error. The following paragraphs summarize calibration error messages and discuss bus error reporting.

Table 2-2

Calibration error messages

Error ID code Error message

-222

+438

+439

+440

Parameter data out of range.

Date of calibration not set.

Next date of calibration not set.

Calibration process not completed.

NOTE: This table lists only those errors that could occur because of some external problem such as improper connections or wrong procedure. See Appendix C for a complete listing of all error messages.

Program 2-1

Example Program to Send Calibration Commands

OPEN “\DEV\IEEEOUT” FOR OUTPUT AS #1 path.

OPEN “\DEV\IEEEIN” FOR INPUT AS #2 path.

IOCTL #1, “BREAK”

PRINT #1, “RESET”

PRINT #1, “REMOTE 16”

PRINT #1, “TERM LF EOI”

PRINT #1, “OUTPUT 16;*RST;*ESE 1”

‘ Open IEEE-488 output

‘ Open IEEE-488

‘ Reset interface.

input

‘ Warm start interface.

‘ Put unit in remote.

‘ Set terminator.

‘ Initialize 2001.

Cmd: LINE INPUT “COMMAND? ”; A$

IF RIGHT$(A$, 1) = “?” THEN GOTO Query ‘ Check for a query.

PRINT #1, “OUTPUT 16;*CLS”

PRINT #1, “OUTPUT 16;”; A$; “;*OPC”

‘ Clear status registers.

‘ Send command to unit.

Cal:

PRINT #1, “SPOLL 16”

INPUT #2, S

IF (S AND 32) = 0 THEN GOTO Cal:

‘ Check for completed cal.

GOTO Cmd

Query:

PRINT #1, “OUTPUT 16;”; A$

PRINT #1, “ENTER 16”

‘ Send query to unit.

‘ Address unit to talk.

‘ Input response from unit.

PRINT B$

2-5

Calibration

2.7.2 IEEE-488 bus error reporting

You can detect errors over the bus by testing the state of EAV

(Error Available) bit (bit 2) in the status byte. (Use the

*STB? query or serial polling to request the status byte.) If you wish to generate an SRQ (Service Request) on errors, send “*SRE 4” to the instrument to enable SRQ on errors.

You can query the instrument for the type of error by using the “:SYSTem:ERRor?” query. The Model 2001 will respond with the error number and a text message describing the nature of the error.

See paragraph 3.5 in Section 3 for more information on bus error reporting.

2.8.1 Recommended equipment for comprehensive calibration

Table 2-3 lists all test equipment recommended for compre-

hensive calibration. Alternate equipment (such as a DC transfer standard and characterized resistors) may be used as long as that equipment has specifications at least as good as those listed in the table. See Appendix D for a list of alternate calibration sources.

NOTE

Do not connect test equipment to the Model 2001 through a scanner.

2.8 Comprehensive calibration

The comprehensive calibration procedure calibrates DCV,

DCI (except for the 2A range), ¾2, and ¾4 functions. At the end of the DC calibration procedure, AC self-calibration is performed to complete the calibration process.

Comprehensive calibration should be performed at least once a year, or every 90 days to ensure the unit meets the corresponding specifications.

The comprehensive calibration procedure covered in this paragraph is normally the only calibration required in the field. However, if the unit has been repaired, you should perform the low-level calibration procedure explained in paragraph 2.10.

2.8.2 Front panel comprehensive calibration

Follow the steps below to calibrate the Model 2001 from the front panel. Refer to paragraph 2.8.3 below for the procedure

to calibrate the unit over the IEEE-488 bus. Table 2-4 sum-

marizes the front panel calibration procedure.

Table 2-4

Front panel comprehensive calibration summary

Step Description

Warm-up, unlock calibration

DC zero calibration

+2VDC calibration

+20VDC calibration

20k¾ calibration

1M¾ calibration

Open-circuit calibration

AC self-calibration

Enter calibration dates

Save calibration constants

Equipment/ connections

None

Low-thermal short

DC calibrator

Ohms calibrator

Disconnect leads

None

Table 2-3

Recommended equipment for comprehensive calibration

Mfg.

Model Description Specifications*

Fluke 5700A Calibrator ±5ppm basic uncertainty.

DC voltage:

2V: ±5ppm

20V: ±5ppm

Resistance:

19k¾: ±11ppm

1M¾: ±18ppm

Keithley 8610 Low-thermal shorting plug

* 90-day calibrator specifications shown include total uncertainty at specified output. The 2V output includes 0.5ppm transfer uncertainty. Use 20k¾ instead of 19k¾ if available with alternate resistance standard. See Appendix D for a list of alternate calibration sources.

2-6

Calibration

Procedure

Step 1: Prepare the Model 2001 for calibration

1. Turn on the power, and allow the Model 2001 to warm up for at least one hour before performing calibration.

2. Unlock comprehensive calibration by briefly pressing in on the recessed front panel CAL switch, and verify that the following message is displayed:

CALIBRATION UNLOCKED

Comprehensive calibration can now be run

3. Enter the front panel calibration menu as follows:

A. From normal display, press MENU.

B. Select CALIBRATION, and press ENTER.

C. Select COMPREHENSIVE, then press ENTER.

4. At this point, the instrument will display the following message:

DC CALIBRATION PHASE

Step 2: DC zero calibration

1. Press ENTER. The instrument will display the following prompt.

SHORT-CIRCUIT INPUTS

2. Connect the Model 8610 low-thermal short to the instru-

ment INPUT and SENSE terminals, as shown in Figure

2-1. Wait at least three minutes before proceeding to al-

low for thermal equilibrium.

NOTE

Be sure to connect the low-thermal short properly to the HI, LO, and SENSE terminals. Keep drafts away from low-thermal connections to avoid thermal drift, which could affect calibration accuracy.

3. Press ENTER. The instrument will then begin DC zero calibration. While calibration is in progress, the following will be displayed:

Performing Short-Ckt Calibration

Model 2001

S+

SENSE

Ω 4 WIRE

INPUT

PREV

DISPLAY

NEXT

POWER

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Figure 2-1

Low-thermal short connections

S-

Model 8610

Low-thermal short

Step 3: +2V DC calibration

1. When the DC zero calibration step is completed, the following message will be displayed:

CONNECT 2 VDC CAL

2. Disconnect the low-thermal short, and connect the DC

calibrator to the INPUT jacks, as shown in Figure 2-2.

NOTE

Although 4-wire connections are shown, the sense leads are connected and disconnected at various points in the 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 off, and connect the sense leads when external sensing is to be turned on.

3. Set the calibrator output to +2.0000000V, and turn external sense off.

4. Press ENTER, and note that the Model 2001 displays the presently selected calibration voltage:

VOLTAGE = 2.0000000

(At this point, you can use the cursor and range keys to set the calibration voltage to a value from 0.98 to 2.1V

if your calibrator cannot source 2V).

NOTE

For best results, it is recommended that you use the displayed calibration values throughout the procedure whenever possible.

5. Press ENTER. The instrument will display the following during calibration:

2-7

Calibration

Sense LO

5700A Calibrator

PREV

DISPLAY

NEXT

POWER

Sense HI

Model 2001

SENSE

Ω 4 WIRE

INPUT

Input HI

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

2A 250V

AMPS

500V

PEAK

CAL

Input

Sense LO

Sense HI

Output HI

Output

Note: Use shielded cables to minimize noise.

Enable or disable calibrator external

sense as indicated in procedure. Use

internal Guard (EX GRD LED is off).

Figure 2-2

Connections for comprehensive calibration

Performing 2 VDC Calibration

Step 4: +20V DC calibration

1. After completing 2VDC calibration, the instrument will display the following:

CONNECT 20 VDC CAL

2. Set the DC calibrator output to +20.000000V.

3. Press ENTER, and note that the instrument displays the calibration voltage:

VOLTAGE = 20.0000000

(At this point, you can use the cursor and range keys to set the calibration voltage to a value from 9.8 to 21V if your calibrator cannot source 20V).

4. Press ENTER. The instrument will display the following message to indicate it is performing 20V DC calibration:

Performing 20 VDC Calibration

Step 5: 20k¾ calibration

1. After completing 20VDC calibration, the instrument will display the following:

CONNECT 20kOHM RES

2. Set the calibrator output to 19.0000k¾, and turn external sense on.

3. Press ENTER, and note that the Model 2001 displays the resistance calibration value:

OHMS = 20000.000

Ground link installed.

4. Using the cursor and range keys, set the resistance value displayed by the Model 2001 to the exact resistance value displayed by the calibrator. (The allowable range is from 9k¾ to 21k¾.)

5. Press ENTER, and note that the instrument displays the following during 20k¾ calibration:

Performing 20 kOHM Calibration

Step 6: 1M¾ calibration

1. After completing 20k¾ calibration, the instrument will display the following:

CONNECT 1.0 MOHM RES

2. Set the calibrator output to 1.00000M¾, and turn external sense off.

3. Press ENTER, and note that the Model 2001 displays the resistance calibration value:

OHMS = 1000000.000

4. Using the cursor and range keys, set the resistance value displayed by the Model 2001 to the exact resistance value displayed by the calibrator. (The allowable range for this parameter is from 800k¾ to 2M¾.)

5. Press ENTER, and note that the instrument displays the following during 1M¾ calibration:

Performing 1.0 MOHM Calibration

Step 7: Open-circuit calibration

1. At this point, the instrument will display the following message advising you to disconnect test leads:

OPEN CIRCUIT INPUTS

2-8

Calibration

2. Disconnect all test leads from the INPUT and SENSE jacks, then press ENTER. During this calibration phase, the instrument will display the following:

Performing Open-Ckt Calibration

Step 8: AC self-calibration

1. After open circuit calibration, the instrument will display the following message:

AC CALIBRATION PHASE

2. Make sure all test leads are still disconnected from the

Model 2001 INPUT and SENSE jacks.

3. Press ENTER to perform AC calibration, which will take about six minutes to complete. During AC calibration, the instrument will display the following:

Calibrating AC: Please wait

4. When AC calibration is finished, the instrument will display the following:

AC CAL COMPLETE

Step 9: Enter calibration dates

1. Press ENTER, and note that the instrument prompts you to enter the present calibration date:

CAL DATE: 01/01/92

2. Use the cursor and range keys to enter the current date as the calibration date, then press ENTER. Press EN-

TER again to confirm the date as being correct.

3. The instrument will then prompt you to enter the due date for next calibration:

NEXT CAL: 01/01/93

4. Use the cursor and range keys to set the date as desired, then press ENTER. Press ENTER a second time to confirm your selection.

Step 10: Save calibration constants

1. At the end of a successful calibration cycle, the instrument will display the following:

CALIBRATION SUCCESS

2. If you wish to save calibration constants from the procedure just completed, press ENTER.

3. If you do not want to save calibration constants from the procedure just completed and wish instead to restore previous constants, press EXIT.

4. Press EXIT to return to normal display after calibration.

NOTE

Comprehensive calibration will be automatically locked out after the calibration procedure has been completed.

2.8.3 IEEE-488 bus comprehensive calibration

Follow the procedure outlined below to perform comprehensive calibration over the IEEE-488 bus. Use the program listed in paragraph 2.6.3 or other similar program to send

commands to the instrument. Table 2-5 summarizes the cal-

ibration procedure and bus commands.

Procedure

Step 1: Prepare the Model 2001 for calibration

1. Connect the Model 2001 to the IEEE-488 bus of the computer using a shielded IEEE-488 cable such as the

Keithley Model 7007.

2. Turn on the power, and allow the Model 2001 to warm up for at least one hour before performing calibration.

3. Unlock calibration by briefly pressing in on the recessed front panel CAL switch, and verify that the following message is displayed:

CALIBRATION UNLOCKED

Comprehensive calibration can now be run

NOTE

You can query the instrument for the state of the comprehensive CAL switch by using the following query:

:CAL:PROT:SWIT?

A returned value of 1 indicates that calibration is locked, while a returned value of

0 shows that calibration is unlocked.

4. Make sure the primary address of the Model 2001 is the same as the address specified in the program you will be using to send commands (see paragraph 2.6.3).

2-9

Calibration

Table 2-5

IEEE-488 bus comprehensive calibration summary

Step Description

Warm-up, unlock calibration

DC zero calibration

+2VDC calibration

+20VDC calibration

20k¾ calibration

1M¾ calibration

Open-circuit calibration

Calculate constants

Check for errors

Perform user AC cal

Check for errors

Save calibration dates

Save calibration constants

Lock out calibration

IEEE-488 bus command

:CAL:PROT:DC:ZERO

:CAL:PROT:DC:LOW <value>

:CAL:PROT:DC:HIGH <value>

:CAL:PROT:DC:LOHM <value>

:CAL:PROT:DC:HOHM <value>

:CAL:PROT:DC:OPEN

:CAL:PROT:DC:CALC

:SYST:ERR?

:CAL:UNPR:ACC

:SYST:ERR?

:CAL:PROT:DATE “<cal_date>”

:CAL:PROT:NDUE “<due_date>”

:CAL:PROT:DC:SAVE

:CAL:PROT:LOCK

Step 2: DC zero calibration

1. Connect the Model 8610 low-thermal short to the instru-

ment INPUT and SENSE terminals, as shown in Figure

2-1. Wait at least three minutes before proceeding to al-

low for thermal equilibrium.

NOTE

Be sure to properly connect HI, LO, and

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

2. Send the following command over the bus:

:CAL:PROT:DC:ZERO

3. Wait until the Model 2001 finishes this calibration step before proceeding. (You can use the *OPC or *OPC?

commands to determine when calibration steps end, as discussed in paragraph 3.6.)

Step 3: +2V DC calibration

1. Disconnect the low-thermal short, and connect the DC

calibrator to the INPUT jacks, as shown in Figure 2-2.

NOTE

2. Set the DC calibrator output to +2.00000V, and turn external sense off.

3. Send the following command to the Model 2001 over the IEEE-488 bus:

:CAL:PROT:DC:LOW 2.0

(Be sure to use the exact calibration value if you are using a voltage other than 2V. The allowable range from is

0.98V to 2.1V).

NOTE

For best results, use the calibration values given in this procedure whenever possible.

4. Wait until the Model 2001 finishes this step before going on.

2-10

Calibration

Step 4: +20V DC calibration

1. Set the DC calibrator output to +20.00000V.

2. Send the following command to the instrument:

:CAL:PROT:DC:HIGH 20

(Send the actual calibration value in the range of 9.8V to

21V if you are using a different voltage.)

3. Wait until the Model 2001 finishes this step before going on.

Step 5: 20k¾ calibration

1. Set the calibrator output to 19.0000k¾, and turn external sense on.

NOTE

If your calibrator can source 20k¾, use that value instead of the 19k¾ value.

2. Send the following command to the Model 2001:

:CAL:PROT:DC:LOHM <value>

Here, <value> is the actual calibrator resistance value.

For example, if the calibrator resistance is 18.9987k¾, the command would appear as follows:

:CAL:PROT:DC:LOHM 18.9987E3

(The allowable range for this parameter is from 9E3 to

20E3.)

3. Wait until the Model 2001 finishes 20k¾ calibration before continuing.

Step 6: 1M¾ calibration

1. Set the calibrator output to 1.0000M¾, and turn external sense off.

2. Send the following command to the Model 2001:

:CAL:PROT:DC:HOHM <value>

Here, <value> is the actual calibrator resistance value.

For example, if the calibrator resistance is 1.00023M¾, the command would appear as follows:

:CAL:PROT:DC:HOHM 1.00023E6

(The allowable range for this parameter is from 800E3 to 2E6.)

3. Wait until the Model 2001 finishes 1M¾ calibration before continuing.

Step 7. Open-circuit calibration

1. Disconnect all test leads from the Model 2001 INPUT and SENSE jacks.

2. Send the following command to the instrument:

:CAL:PROT:DC:OPEN

3. Wait until open-circuit calibration is complete before going on to the next step.

Step 8: Calculate DC calibration constants

To program the Model 2001 to calculate new DC calibration constants, send the following command over the bus:

:CAL:PROT:DC:CALC

Step 9: Check for DC calibration errors

You can check for DC calibration errors over the bus by sending the following query:

:SYST:ERR?

If no errors are reported, DC calibration is successful, and you can proceed to the next step.

Step 10: Perform AC user calibration

To perform user AC calibration, send the following command:

:CAL:UNPR:ACC

Note that AC calibration will take about six minutes to complete.

Step 11: Check for AC calibration errors

To check for AC calibration errors, send the following query:

SYST:ERR?

If the unit sends back a “No error” response, AC calibration was successful.

Step 12: Enter calibration dates

To set the calibration date and next due date, use following commands to do so:

:CAL:PROT:DATE ‘1/01/92’ (programs calibration date)

:CAL:PROT:NDUE ‘1/01/93’ (programs next calibration due date)

Step 13: Save calibration constants

Calibration is now complete, so you can store the calibration constants in EEROM by sending the following command:

:CAL:PROT:SAVE

2-11

Calibration

Step 14: Lock out calibration

To lock out further calibration, send the following command after completing the calibration procedure:

:CAL:PROT:LOCK

2.9 AC self-calibration

The AC self-calibration procedure requires no external equipment and can be performed at any time by the user. As the name implies, this calibration procedure assures the accuracy of ACI and ACV measurements.

In general, AC calibration should be performed one-hour after power-on or at least once every 24 hours for optimum AC measurement accuracy.

NOTE

The AC calibration constants generated by this procedure are not permanently stored.

Thus, AC calibration constants are in effect only until the power is turned off. In order to permanently store AC calibration constants, you must perform the comprehensive or low-level calibration procedure and then choose to save calibration constants at the end of that procedure. See paragraph 2.8 or 2.10 for details.

5. Press ENTER to begin AC calibration, which will take about six minutes to complete. During AC calibration, the instrument will display the following:

Calibrating AC: Please wait

6. Once the process has been successfully completed, the message below will be displayed, and you can press EN-

TER or EXIT to return to normal display:

AC CAL COMPLETE

Press ENTER or EXIT to continue.

2.9.2 IEEE-488 bus AC self-calibration

Procedure:

1. Disconnect all test leads and cables from the INPUT and

SENSE jacks.

2. Send the following command over the bus:

:CAL:UNPR:ACC

3. Wait until calibration has been completed before sending any further commands.

4. Check for calibration errors by using the :SYST:ERR?

query.

2.9.1 Front panel AC calibration

Procedure:

1. Disconnect all test leads or cables from the INPUT and

SENSE jacks.

2. Press MENU. The instrument will display the following:

MAIN MENU

SAVESETUP GPIB CALIBRATION

3. Select CALIBRATION, then press ENTER. The Model

2001 will display the following:

PERFORM CALIBRATION

COMPREHENSIVE AC-ONLY-CAL

4. Select AC-ONLY-CAL, then press ENTER. The instrument will display the following message:

AC CALIBRATION PHASE

Open-circuit inputs, press ENTER

2.10 Low-level calibration

Low-level calibration is normally performed only at the factory when the instrument is manufactured and is not usually required in the field. The following paragraphs give detailed procedures for performing low-level calibration should it ever become necessary in the field.

NOTE

Low-level calibration is required in the field only if the Model 2001 has been repaired, or if the other calibration procedures cannot bring the instrument within stated specifications. The low-level calibration procedure includes the comprehensive calibration steps discussed in paragraph 2.8. Comprehensive calibration steps must be performed before performing the low-level calibration steps.

2-12

Calibration

2.10.1 Recommended equipment for low-level calibration

Table 2-6 summarizes recommended equipment for low-lev-

el calibration. Alternate equipment may be used as long as corresponding specifications are at least as good as those listed in the table. See Appendix D for a list of alternate calibration sources.

2.10.2 Low-level calibration summary

Table 2-7 summarizes the steps necessary to complete the

low-level calibration procedure. The procedure must be performed in the order shown in the table. Calibration commands shown are to be used when calibrating the unit over the IEEE-488 bus.

Table 2-6

Recommended equipment for low-level calibration

Mfg.

Fluke

Model

5700A

Description

Calibrator

Specifications*

±5ppm basic uncertainty.

DC voltage:

0V: ±0.75μV

-2V, +2V: ±5ppm

20V: ±5ppm

DC current:

200mA: ±65ppm

2A: ±90ppm

AC voltage:

0.5mV @ 1kHz: ±10000ppm

5mV @ 100kHz: ±2400ppm

200mV @ 1kHz: ±150ppm

1.5V @ 1kHz: ±80ppm

20V @ 1kHz: ±80ppm

20V @ 30kHz: ±140ppm

200V @ 1kHz: ±85ppm

200V @ 30kHz: ±240ppm

AC current:

20mA @ 1kHz: ±160ppm

Resistance:

19k¾: ±11ppm

1M¾: ±18ppm

2V rms @ 1Hz Keithley

Keithley

3930A

8610

Synthesizer

Low-thermal shorting plug

* 90-day calibrator specifications shown include total uncertainty at specified output. The ±2V outputs include 0.5ppm transfer uncertainty. See Appendix D for a list of alternate calibration sources.

2-13

Calibration

Table 2-7

Low-level calibration summary

Calibration signal

Low-thermal short

+2V DC

+20V DC

20k¾

1M¾

Disconnect leads

None

20V AC @ 1kHz

20V AC @ 30kHz

200V AC @ 1kHz

200V AC @ 30kHz

1.5V AC @ 1kHz

200mV AC @ 1kHz

5mV AC @ 100kHz

0.5mV AC @ 1kHz

+2V DC

-2V DC

0V DC

20mA AC @ 1kHz

+200mA DC

+2A DC

2V rms @ 1Hz

None

Calibration command

:CAL:PROT:DC:ZERO

:CAL:PROT:DC:LOW <value>

:CAL:PROT:DC:HIGH <value>

:CAL:PROT:DC:LOHM <value>

:CAL:PROT:DC:HOHM <value>

:CAL:PROT:DC:OPEN

:CAL:PROT:DC:CALC

:SYST:ERR?

:CAL:UNPR:ACC

:SYST:ERR?

:CAL:PROT:LLEV:STEP 1

:CAL:PROT:LLEV:STEP 2

:CAL:PROT:LLEV:STEP 3

:CAL:PROT:LLEV:STEP 4

:CAL:PROT:LLEV:STEP 5

:CAL:PROT:LLEV:STEP 6

:CAL:PROT:LLEV:STEP 7

:CAL:PROT:LLEV:STEP 8

:CAL:PROT:LLEV:STEP 9

:CAL:PROT:LLEV:STEP 10

:CAL:PROT:LLEV:STEP 11

:CAL:PROT:LLEV:STEP 12

:CAL:PROT:LLEV:STEP 13

:CAL:PROT:LLEV:STEP 14

:CAL:PROT:LLEV:STEP 15

:CAL:PROT:LLEV:CALC

:SYST:ERR?

:CAL:PROT:DATE “<date>”

:CAL:PROT:NDUE “<due>”

:CAL:PROT:SAVE

:CAL:PROT:LOCK

Comments

Comprehensive cal zero.

Comprehensive cal 2V.

Comprehensive cal 20V.

Comprehensive cal 20k¾.

Comprehensive cal 1M¾.

Comprehensive cal open.

Calculate constants.

Check for DC errors.

AC user calibration.

Check for AC errors.

Low-level Step 1.

Low-level Step 2.

Low-level Step 3.

Low-level Step 4.

Low-level Step 5.

Low-level Step 6.

Low-level Step 7.

Low-level Step 8.

Low-level Step 9.

Low-level Step 10.

Low-level Step 11.

Low-level Step 12.

Low-level Step 13.

Low-level Step 14.

Low-level Step 15.

Calculate constants.

Check for errors.

Program cal date

Program cal due date.

Save constants.

Lock out calibration.

2-14

Calibration

2.10.3 Front panel low-level calibration procedure

Follow the steps below to perform low-level calibration from the front panel.

Procedure

1. Turn off the power if the instrument is presently turned on.

2. While pressing in on the recessed CAL switch, turn on the power. The instrument will display the following to indicated it is ready for low-level calibration:

MANUFACTURING CAL

3. Press ENTER. The instrument will display the following:

DC CALIBRATION PHASE

4. Allow the Model 2001 to warm up for at least one hour before performing calibration.

5. Press ENTER. The instrument will display the following prompt.

SHORT-CIRCUIT INPUTS

6. Connect the Model 8610 low-thermal short to the instru-

ment INPUT and SENSE terminals, as shown in Figure

2-1. Wait three minutes before proceeding to allow for

thermal equilibrium.

NOTE

Be sure to properly connect HI, LO, and

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

7. Press ENTER. The instrument will then begin DC zero calibration. While calibration is in progress, the following will be displayed:

Performing Short-Ckt Calibration

8. When the DC zero calibration step is completed, the following message will be displayed:

CONNECT 2 VDC CAL

9. Disconnect the low-thermal short, and connect the DC

calibrator to the INPUT jacks, as shown in Figure 2-2.

10. Set the DC calibrator output to +2.00000V, and make sure that external sense is turned off.

11. Press ENTER, and note that the Model 2001 displays the presently selected calibration voltage:

VOLTAGE = 2.0000000

(At this point, you can use the cursor and range keys to set the calibration voltage to a value from 0.98 to 2.1V

if your calibrator cannot output 2V).

12. Press ENTER. The instrument will display the following during calibration:

Performing 2 VDC Calibration

13. After completing 2VDC calibration, the instrument will display the following:

CONNECT 20 VDC CAL

14. Set the DC calibrator output to +20.00000V.

15. Press ENTER, and note that the instrument displays the calibration voltage:

VOLTAGE = 20.000000

(At this point, you can use the cursor and range keys to set the calibration voltage to a value from 9.8 to 21V if your calibrator cannot output 20V).

16. Press ENTER. The instrument will display the following message to indicate it is performing 20V DC calibration:

Performing 20 VDC Calibration

17. After completing 20VDC calibration, the instrument will display the following:

CONNECT 20kOHM RES

18. Set the calibrator output to 19.0000k¾, and turn external sense on. (Allowable range is from 9k¾ to 20k¾.)

19. Press ENTER, and note that the Model 2001 displays the resistance calibration value:

OHMS = 20000.000

20. Using the cursor and range keys, set the resistance value displayed by the Model 2001 to the exact resistance value displayed by the calibrator.

21. Press ENTER, and note that the instrument displays the following during 20k¾ calibration:

Performing 20 kOHM Calibration

22. After completing 20k¾ calibration, the instrument will display the following:

CONNECT 1.0 MOHM RES

23. Set the calibrator output to 1.00000M¾, and turn external sense off. (Allowable range is 800k¾ to 2M¾.)

24. Press ENTER, and note that the Model 2001 displays the resistance calibration value:

OHMS = 1000000.00

25. Using the cursor keys, set the resistance value displayed by the Model 2001 to the exact resistance value displayed by the calibrator.

2-15

Calibration

26. Press ENTER, and note that the instrument displays the following during 1M¾ calibration:

Performing 1.0 MOhm Calibration

27. At this point, the instrument will display the following message advising you to disconnect test leads:

OPEN CIRCUIT INPUTS

28. Disconnect all test leads from the INPUT and SENSE jacks, then press ENTER. During this calibration phase, the instrument will display the following:

Performing Open-Ckt Calibration

29. After open circuit calibration, the instrument will display the following message:

AC CALIBRATION PHASE

30. Make sure all test leads are still disconnected from the

Model 2001 INPUT and SENSE jacks.

31. Press ENTER to perform AC calibration, which will take a while to complete. During AC calibration, the instrument will display the following:

Calibrating AC: Please wait

32. After the AC calibration phase is completed, the instrument will display the following:

AC CAL COMPLETE

33. Press ENTER. The instrument will display the following to indicate the start of the low-level calibration phase:

LOW-LEVEL CAL PHASE

NOTE

Use the exact calibration values shown when performing the following steps.

5700A Calibrator

Model 2001

SENSE

Ω 4 WIRE

INPUT

PREV

DISPLAY

NEXT

POWER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

350V

PEAK

1100V

PEAK

2001 MULTIMETER

FREQ TEMP

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

EXIT ENTER

Input HI

Output HI

Input

Output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

Figure 2-3

Calibration voltage connections

34. Connect the calibrator to the INPUT terminals, as

shown in Figure 2-3.

35. Press ENTER. The instrument will display the following:

Connect 20V @ 1kHz

36. Set the calibrator to output 20V AC at a frequency of

1kHz, then press ENTER. The instrument will display the following:

Low-Level Cal - Step 1 of 15

37. Next, the instrument will prompt for a new calibration signal:

Connect 20V @ 30kHz

38. Program the calibrator for an output voltage of 20V AC at 30kHz, then press ENTER. The instrument will display the following while calibrating this step:

Low-Level Cal - Step 2 of 15

39. The Model 2001 will then display:

Connect 200V @ 1kHz

40. Set the calibrator output to 200V AC at a frequency of

1kHz, then press ENTER. The Model 2001 will display the following message:

Low-Level Cal - Step 3 of 15

41. When finished with this step, the Model 2001 will display:

Connect 200V @ 30kHz

42. Set the calibrator output to 200V AC at 30kHz, then press ENTER. The Model 2001 will display the following:

Low-Level Cal - Step 4 of 15

2-16

Calibration

43. The unit will then prompt for the next calibration signal:

Connect 1.5V @ 1kHz

44. Set the calibrator for 1.5V AC at a frequency of 1kHz, then press ENTER. The Model 2001 will display the following:

Low-Level Cal - Step 5 of 15

45. After step 5, the unit will display the following:

Connect 200mV @ 1kHz

46. Program the calibrator to output 200mV at a frequency of 1kHz, then press ENTER. The Model 2001 will then display the following:

Low-Level Cal - Step 6 of 15

47. When finished with step 6, the unit will display the following:

Connect 5mV @ 100kHz

48. Set the calibrator to output 5mV at a frequency of

100kHz, then press ENTER. The Model 2001 will then display the following while calibrating:

Low-Level Cal - Step 7 of 15

49. Following step 7, the instrument will display the following message to prompt for the next calibration signal:

Connect 0.5mV @ 1kHz

50. Program the calibrator to output 0.5mV at 1kHz, then press ENTER. The unit will display the following inprogress message:

Low-Level Cal - Step 8 of 15

51. Next, the unit will prompt for the next calibration signal:

Connect +2 VDC

52. Set the calibrator to output +2V DC, then press the EN-

TER key. The Model 2001 will advise you that the present step is in progress:

Low-Level Cal - Step 9 of 15

53. After this step has been completed, the unit will display the following:

Connect -2 VDC

54. Set the calibrator for an output voltage of -2V DC, then press ENTER. The Model 2001 will display the following message:

Low-Level Cal - Step 10 of 15

55. The Model 2001 will then prompt for the next calibration signal:

Set calibrator to 0V

56. Program the calibrator to output 0 VDC, then press the

ENTER key. The Model 2001 will display the following:

Low-Level Cal - Step 11 of 15

57. After completing step 11, the unit will display the following:

Connect 20mA @ 1kHz

58. Connect the calibrator to the AMPS and INPUT LO

jacks, as shown in Figure 2-4.

59. Set the calibrator output to 20mA AC at a frequency of

1kHz, then press the ENTER key. The Model 2001 will display the following while calibrating:

Low-Level Cal - Step 12 of 15

60. The unit will then prompt for the next calibration signal:

Connect +0.2ADC

5700A Calibrator

Model 2001

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

PREV

DISPLAY

NEXT

POWER

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input

Output HI

Amps

Output

Ground link installed.

Note: Be sure calibrator is set for normal current output.

Use internal Guard (EX GRD LED is off).

Figure 2-4

Current calibration connections

2-17

Calibration

61. Program the calibrator to output +200mA DC, then press then ENTER key. The Model 2001 will display the following while calibrating:

Low-Level Cal - Step 13 of 15

62. The Model 2001 will prompt for the next calibration signal:

Connect +2 ADC

63. Program the calibrator to output +2A DC, then press the

ENTER key. During calibration, the instrument will display the following:

Low-Level Cal - Step 14 of 15

64. The unit will then prompt for the last calibration signal:

Connect 2 V at 1 Hz

65. Put the calibrator in standby, then disconnect it from the

Model 2001 INPUT and AMPS jacks; connect the syn-

thesizer to INPUT HI and LO, as shown in Figure 2-5.

66. Set synthesizer operation modes as follows:

FCTN: sine

FREQ: 1Hz

AMPTD: 2Vrms

MODE: CONT

67. Press the Model 2001 ENTER key. The instrument will display the following while calibrating:

Low-Level Cal - Step 15 of 15

68. After step 15 is completed, the instrument will display the following message to indicate that calibration has been completed:

CALIBRATION COMPLETE

69. Press ENTER. The instrument will prompt you to enter the calibration date:

CAL DATE: 01/01/92

70. Use the cursor and range keys to set the date as desired, then press ENTER. Press ENTER a second time to confirm your date selection.

71. The Model 2001 will then prompt you to enter the calibration due date:

NEXT CAL: 01/01/92

72. Use the cursor keys to set the date as desired, then press

ENTER. Press ENTER again to confirm your date.

73. The Model 2001 will then display the following message:

CALIBRATION SUCCESS

74. If you wish to save the new calibration constants, press

ENTER. If, on the other hand, you wish to restore previous calibration constants, press EXIT.

75. Press EXIT as necessary to return to normal display.

NOTE

Calibration will be locked out automatically when the calibration procedure is completed.

2.10.4 IEEE-488 bus low-level calibration procedure

Follow the steps below to perform low-level calibration over

the IEEE-488 bus. Table 2-7 summarizes calibration com-

mands for the procedure.

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

BNC-to-Dual

Banana Plug

Adapter

Model 3930A Synthesizer

3930A MULTIFUNCTION SYNTHESIZER

Ω BNC Coaxial Cable

Figure 2-5

Synthesizer connections

Function

Output

2-18

Calibration

Procedure

1. Connect the Model 2001 to the IEEE-488 bus of the computer using a shielded IEEE-488 cable such as the

Keithley Model 7007.

2. Make sure the primary address of the Model 2001 is the same as the address specified in the program you will be using to send commands (see paragraph 2.6.3).

3. Turn off the power if the instrument is presently turned on.

4. Press and hold the recessed CAL switch while turning on the power. The instrument will display the following message to indicate it is ready for the low-level calibration procedure:

MANUFACTURING CAL

5. Allow the Model 2001 to warm up for at least one hour before performing calibration.

6. Connect the Model 8610 low-thermal short to the instru-

ment INPUT and SENSE terminals, as shown in Figure

2-1. Wait three minutes before proceeding to allow for

thermal equilibrium.

NOTE

Be sure to properly connect HI, LO, and

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

7. Send the following command over the bus:

:CAL:PROT:DC:ZERO

Wait until the Model 2001 finishes this calibration step before proceeding. (You can use the *OPC or *OPC?

commands to determine when calibration steps end, as discussed in paragraph 3.6.)

8. Disconnect the low-thermal short, and connect the DC

calibrator to the INPUT jacks, as shown in Figure 2-2.

9. Set the DC calibrator output to +2.00000V, and turn external sense off. Send the following command to the

Model 2001 over the IEEE-488 bus:

:CAL:PROT:DC:LOW 2.0

(Be sure to use the exact calibration value if you are using a voltage other than 2V. The allowable range is

0.98V to 2.1V).

NOTE

For best results, use the calibration values given in this part of the procedure whenever possible.

Wait until the Model 2001 finishes this step before going on.

10. Set the DC calibrator output to +20.00000V. Send the following command to the instrument:

:CAL:PROT:DC:HIGH 20

(Send the actual calibration value in the range of 9.8V to

21V if you are using a different voltage.) Wait until the

Model 2001 finishes this step before going on.

11. Set the calibrator output to 19.0000k¾, and turn external sense on. Send the following command to the Model

2001:

:CAL:PROT:DC:LOHM <value>

Here, <value> is the actual calibrator resistance value.

For example, if the calibrator resistance is 18.9987k¾, the command would appear as follows:

:CAL:PROT:DC:LOHM 18.9987E3

Wait until the Model 2001 finishes the 20k¾ calibration step before continuing.

NOTE

If your calibrator can source 20k¾, use that value instead of the 19k¾ value used here.

12. Set the calibrator output to 1.0000M¾, and turn external sense off. Send the following command to the Model

2001:

:CAL:PROT:DC:HOHM <value>

Here, <value> is the actual calibrator resistance value.

For example, if the calibrator resistance is 1.00023M¾, the command would appear as follows:

:CAL:PROT:DC:HOHM 1.00023E6

Wait until the Model 2001 finishes 1M¾ calibration before continuing.

13. Disconnect all test leads from the INPUT and SENSE jacks. Send the following command to the instrument:

:CAL:PROT:DC:OPEN

Wait until the open-circuit calibration is complete before going on to the next step.

14. To program the Model 2001 to calculate new calibration constants, send the following command over the bus:

:CAL:PROT:DC:CALC

15. Check for DC calibration errors by sending the following query:

:SYST:ERR?

2-19

Calibration

16. Perform user AC calibration by sending the following command:

:CAL:UNPR:ACC

Note that the AC calibration phase will take about six minutes to complete.

17. Check for AC calibration errors by sending the following command:

:SYST:ERR?

NOTE

The following steps perform the low-level part of the calibration procedure. Use only the indicated calibration values for these steps. Be sure the instrument completes each step before sending the next calibration command.

18. Connect the Model 2001 to the calibrator using 2-wire

connections, as shown in Figure 2-3.

19. Program the calibrator to output 20V AC at a frequency of 1kHz, then send the following command to the Model

2001:

:CAL:PROT:LLEV:STEP 1

20. Program the calibrator to output 20V AC at a frequency of 30kHz, and send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 2

21. Set the calibrator output to 200V AC at 1kHz, then send the following command:

:CAL:PROT:LLEV:STEP 3

22. Set the calibrator output to 200V AC at a frequency of

30kHz, then send the following command:

:CAL:PROT:LLEV:STEP 4

23. Program the calibrator to output 1.5V AC at a frequency of 1kHz. Send the following command to the Model

2001:

:CAL:PROT:LLEV:STEP 5

24. Program the calibrator to output 200mV AC at a frequency of 1kHz, and send the following command to the

Model 2001:

:CAL:PROT:LLEV:STEP 6

25. Set the calibrator output to 5mV AC at a frequency of

100kHz. Send the following command to the Model

2001:

:CAL:PROT:LLEV:STEP 7

26. Program the calibrator to output 0.5mV AC at a frequency of 1kHz. Send the following command to the Model

2001:

:CAL:PROT:LLEV:STEP 8

27. Set the calibrator output to +2V DC. Send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 9

28. Program the calibrator to output -2V DC, and send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 10

29. Set the calibrator output to 0V DC, and then send the following command:

:CAL:PROT:LLEV:STEP 11

30. Connect the calibrator to the AMPS and INPUT LO ter-

minals, as shown in Figure 2-4.

31. Program the calibrator to output 20mA AC at a frequency of 1kHz. Send the following command to the Model

2001:

:CAL:PROT:LLEV:STEP 12

32. Set the calibrator output to +200mA DC. Send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 13

33. Program the calibrator to output +2A DC, then send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 14

34. Connect the multifunction synthesizer to the Model

2001, as shown in Figure 2-5.

35. Set the synthesizer operating modes as follows:

FCTN: sine

FREQ: 1Hz

AMPTD: 2Vrms

MODE: CONT

36. Send the following command to the Model 2001:

:CAL:PROT:LLEV:STEP 15

37. Calculate new calibration constants by sending the following command to the Model 2001:

:CAL:PROT:LLEV:CALC

38. To check for calibration errors, send the following query:

:SYST:ERR?

If no errors are reported, calibration was successfully completed.

2-20

Calibration

39. Update the calibration date and calibration due date by sending the following commands:

:CAL:PROT:DATE ‘1/01/92’

:CAL:PROT:NDUE ‘1/01/93’

40. Save calibration constants in EEPROM by sending the following command:

:CAL:PROT:SAVE

41. Finally, lock out calibration by sending the following command:

:CAL:PROT:LOCK

2-21

Calibration Command Reference

3.1 Introduction

This section contains detailed information on the various

Model 2001 IEEE-488 bus calibration commands. Section 2 of this manual covers detailed calibration procedures, and

Appendix B lists several calibration programs. For information on additional commands to control other instrument functions, refer to the Model 2001 Operator’s Manual.

Information in this section includes:

3.2 Command summary: Summarizes all commands necessary to perform comprehensive, AC, and low-level calibration.

3.3 CALibration:PROTected subsystem: Gives detailed explanations of the various commands used for both comprehensive and low-level calibration.

3.4 CALibration:UNPRotected subsystem: Discusses the

:ACC command, which is used to perform AC user calibration over the bus.

3.5 Bus error reporting: Summarizes bus calibration errors, and discusses how to obtain error information.

3.6 Detecting calibration step completion: Covers how to determine when each calibration step is completed by using the *OPC and *OPC? commands.

3.2 Command summary

Table 3-1 summarizes Model 2001 calibration commands along with the paragraph number where a detail description of each command is located.

3-1

Calibration Command Reference

Table 3-1

IEEE-488 bus calibration command summary

Command Description Paragraph

:CALibration

:PROTected

:LOCK

:SWITch?

:SAVE

:DATA?

:DATE “<string>”

:DATE?

:NDUE “<string>”

:NDUE?

:LLEVel

:SWITch?

:STEP <Step #>

:STEP?

:CALCulate

:DC

:ZERO

:LOW <value>

:HIGH <value>

:LOHM <value>

:HOHM <value>

:OPEN

:CALCulate

:UNPRotected

:ACCompensation

Calibration root command.

All commands in this subsystem are protected by the CAL switch.

Lock out calibration (opposite of enabling cal with CAL switch).

Request comprehensive CAL switch state. (0 = locked; 1 = unlocked)

Save cal constants to EEPROM.

Download cal constants from 2001.

Send cal date to 2001.

Request cal date from 2001.

Send next due cal date to 2001.

Request next due cal date from 2001.

Low-level calibration subsystem.

Request low-level CAL switch state. (0 = locked; 1 = unlocked)

20V AC at 1kHz step.

20V AC at 30kHz step.

200V AC at 1kHz step.

200V AC at 30kHz step.

1.5V AC at 1kHz step.

0.2V AC at 1kHz step.

5mV AC at 100kHz step.

0.5mV AC at 1kHz step.

+2V DC step.

-2V DC step.

0V DC step.

20mA AC at 1kHz step.

+0.2A DC step.

+2A DC step.

2V AC at 1Hz step.

Request cal step number.

Calculate low-level cal constants.

User calibration subsystem.

Low-thermal short calibration step.

+2V DC calibration step.

+20V DC calibration step.

20k¾ calibration step.

1M¾ calibration step.

Open circuit calibration step.

Calculate DC cal constants.

All commands in this subsystem are not protected by CAL switch.

Perform user AC calibration (disconnect all cables)

3.3

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.3.6

3.3.7

3.3.8

3.3.9

3.3.10

3.4

3.4.1

NOTE: Upper case letters indicate short form of each command. For example, instead of sending “:CALIBRATION:PROTECTED:LOCK”, you can send

“:CAL:PROT:LOCK”.

3-2

Calibration Command Reference

3.3 :CALibration:PROTected subsystem

The protected calibration subsystem commands perform all Model 2001 calibration except for AC-only calibration. All commands in this subsystem are protected by the calibration lock (CAL switch). The following paragraphs discuss these commands in detail.

3.3.1

Purpose

Format

Parameters

Description

Programming note

Programming example

3.3.2

Purpose

Format

Response

Description

Programming note

Programming example

LOCK

(:CALibration:PROTected):LOCK

To lock out comprehensive and low-level calibration commands once calibration has been completed.

:cal:prot:lock

None

The :LOCK command allows you to lock out both comprehensive and low-level calibration after completing those procedures. Thus, :LOCK does just the opposite of pressing in on the front panel CAL switch to unlock calibration.

To unlock comprehensive calibration, press in on the CAL switch with power turned on. To unlock low-level calibration, hold in the CAL switch while turning on the power.

10 OUTPUT 716; “:CAL:PROT:LOCK” ! Lock out calibration.

:SWITch?

(:CALibration:PROTected):SWITch?

To read comprehensive calibration lock status.

:cal:prot:swit?

0 Comprehensive calibration locked.

1 Comprehensive calibration unlocked.

The :SWITch? query requests status from the Model 2001 on calibration locked/unlocked state. Calibration must be unlocked by pressing in on the CAL switch while power is turned on before calibration can be performed.

The :CAL:PROT:SWIT? query does not check the status of the low-level calibration lock, which can be checked by using the :CAL:PROT:LLEV:SWIT? query. (See paragraph

3.3.9.)

10 OUTPUT 716; “:CAL:PROT:SWIT?”

20 ENTER 716; S

30 PRINT S

! Query for switch status.

! Input response.

! Display response.

3-3

Calibration Command Reference

3.3.3

Purpose

Format

Parameters

Description

Programming note

Programming example

SAVE

(:CALibration:PROTected):SAVE

To save calibration constants in EEPROM after the calibration procedure.

:cal:prot:save

None

The :SAVE command stores internally calculated calibration constants derived during calibration in EEPROM. EEPROM is non-volatile memory, and calibration constants will be retained indefinitely once saved. Generally, :SAVE is the last command sent during calibration.

Calibration will be only temporary unless the :SAVE command is sent to permanently store calibration constants.

10 OUTPUT 716; “:CAL:PROT:SAVE” ! Save constants.

3.3.4

Purpose

Format

Response

Description

Programming note

Programming example

:DATA?

(:CALibration:PROTected):DATA?

To download calibration constants from the Model 2001

:cal:prot:data?

:DATA? allows you to request the present calibration constants stored in EEPROM from the instrument. This command can be used to compare present constants with those from a previous calibration procedure to verify that calibration was performed properly. The returned values are 99 numbers using ASCII representation delimited by commas (,). See Appendix

C for a listing of constants.

The :CAL:PROT:DATA? response is not affected by the FORMAT subsystem.

10 DIM A$[2000]

20 OUTPUT 716; “:CAL:PROT:DATA?”

30 ENTER 716; A$

40 PRINT A$

! Dimension string.

! Request constants.

! Input constants.

! Display constants.

3-4

3.3.5

Purpose

Format

Parameters

Description

Programming note

Programming example

3.3.6

Purpose

Format

Response

Description

Programming example

3.3.7

Purpose

Format

Parameters

Description

Programming note

Programming example

Calibration Command Reference

DATE

(:CALibration:PROTected):DATE

To send the calibration date to the instrument.

:cal:prot:date “<string>”?

<string> = date (mm/dd/yy)

The :DATE command allows you to store the calibration date in instrument memory for future reference. You can read back the date from the instrument over the bus by using the

:DATE? query, or by using the CALIBRATION selection in the front panel menu.

The date <string> must be enclosed either in double or single quotes (“<string>” or

‘<string>’).

10 OUTPUT 716; “:CAL:PROT:DATE ‘01/01/92’” ! Send date.

:DATE?

(:CALibration:PROTected):DATE?

To request the calibration date from the instrument.

:cal:prot:date?

<date> (mm/dd/yy)

The :DATE? query allows you to request from the instrument the previously stored calibration date. The instrument response is simply a string of ASCII characters representing the last stored date.

10 OUTPUT 716; “:CAL:PROT:DATE?”

20 ENTER 716; A$

30 PRINT A$

! Query for date.

! Input date.

! Display date.

:NDUE

(:CALibration:PROTected):NDUE

To send the next calibration due date to the instrument.

:cal:prot:ndue “<string>”

<string> = next due date (mm/dd/yy)

The :NDUE command allows you to store the date when calibration is next due in instrument memory. You can read back the next due date from the instrument over the bus by using the :NDUE? query, or by using the CALIBRATION-DATES selection in the front panel menu.

The next due date <string> must be enclosed either in single or double quotes (“<string>” or ‘<string>’).

10 OUTPUT 716; “:CAL:PROT:NDUE ‘01/01/93’” ! Send due date.

3-5

Calibration Command Reference

3.3.8

Purpose

Format

Response

Description

Programming example

3.3.9

:NDUE?

(:CALibration:PROTected):NDUE?

To request the calibration due date from the instrument.

:cal:prot:ndue?

<date> (mm/dd/yy)

The :NDUE? query allows you to request from the instrument the previously stored calibration due date. The instrument response is a string of ASCII characters representing the last stored due date.

10 OUTPUT 716; “:CAL:PROT:DATE?”

20 ENTER 716; A$

30 PRINT A$

! Query for due date.

! Input due date.

! Display due date.

:LLEVel

(CALibration:PROTected):LLEVel

Low-level calibration commands are summarized in Table 3-2.

Table 3-2

Low-level calibration commands

Command

:CALibration

:PROTected

:LLEVel

:SWITch?

Description

Low-level calibration subsystem.

Request low-level CAL switch state.

(0 = locked; 1 = unlocked)

:STEP <Step #>

:CALCulate

20V AC at 1kHz step.

20V AC at 30kHz step.

200V AC at 1kHz step.

200V AC at 30kHz step.

1.5V AC at 1kHz step.

0.2V AC at 1kHz step.

5mV AC at 100kHz step

0.5mV AC at 1kHz step.

+2V DC step.

-2V DC step.

0V DC step.

20mA AC at 1kHz step.

+0.2A DC step.

+2A DC step.

2V AC at 1Hz step.

Calculate low-level cal constants.

3-6

Purpose

Format

Response

Description

Programming note

Programming example

Purpose

Format

Parameters

Description

Programming example

Calibration Command Reference

:SWITch?

(CALibration:PROTected:LLEVel):SWITch?

To request the state of the low-level calibration lock.

:cal:prot:llev:swit?

0 Low-level calibration locked.

1 Low-level calibration unlocked.

:SWITch? query requests the status of the low-level calibration lock from the instrument.

This :SWITch? query should not be confused with the :SWITch query that requests the status of the comprehensive calibration lock (see paragraph 3.3.1).

To unlock low-level calibration, hold in the CAL switch while turning on instrument power.

10 OUTPUT 716; “:CAL:PROT:LLEV:SWIT?” ! Request switch status.

20 ENTER 716; S ! Input switch status.

30 PRINT S ! Display switch status.

:STEP

(CALibration:PROTected:LLEVel):STEP

To program individual low-level calibration steps.

:cal:prot:llev:step <n>

1 20V AC @ 1kHz

2 20V AC @ 30kHz

3 200V AC @ 1kHz

4 200V AC @ 30kHz

5 1.5V AC @ 1kHz

6 200mV AC @ 1kHz

7 5mV AC @ 100kHz

8 0.5mV AC @ 1kHz

9 +2V DC

10 -2V DC

11 0V DC

12 20mA @ 1kHz

13 +200mA DC

14 +2A DC

15 2V AC @ 1Hz

The :STEP command programs the 15 individual low-level calibration steps; <n> represents the calibration step number. The appropriate signal must be connected to the instrument when programming each step, as summarized in the parameters listed above (see

Section 2 for details).

10 OUTPUT 716; “:CAL:PROT:LLEV:STEP 1” ! Low-level Step 1.

3-7

Calibration Command Reference

Purpose

Format

Response

Description

Programming example

Purpose

Format

Parameters

Description

Programming example

:STEP?

(CALibration:PROTected:LLEVel):STEP?

To request current low-level calibration step.

:cal:prot:llev:step?

1 20V AC @ 1kHz

2 20V AC @ 30kHz

3 200V AC @ 1kHz

4 200V AC @ 30kHz

5 1.5V AC @ 1kHz

6 200mV AC @ 1kHz

7 5mV AC @ 100kHz

8 0.5mV AC @ 1kHz

9 +2V DC

10 -2V DC

11 0V DC

12 20mA @ 1kHz

13 +200mA DC

14 +2A DC

15 2V AC @ 1Hz

The :STEP? query requests the present low-level calibration step.

10 OUTPUT 716; “:CAL:PROT:LLEV:STEP ?” ! Request step.

20 ENTER 716;S ! Input step.

30 PRINT S ! Display step.

:CALCulate

(:CALibration:PROTected:LLEVel):CALCulate

To program the Model 2001 to calculate new low-level calibration constants.

:cal:prot:llev:calc

None

The :CALCulate command causes the Model 2001 to calculate new low-level calibration constants based on parameters determined during the calibration procedure. This command should be sent after completing all low-level calibration steps, but before saving calibration constants in EEPROM with the :SAVE command.

10 OUTPUT 716; “:CAL:PROT:LLEV:CALC” ! Calculate constants.

3-8

3.3.10

Purpose

Format

Parameters

Description

Programming example

Purpose

Format

Parameters

Description

Programming example

Calibration Command Reference

:DC

(CALibration:PROTected):DC

The :DC commands perform comprehensive (user) calibration. Table 3-3 summarizes these comprehensive calibration commands.

Table 3-3

Comprehensive calibration commands

Description Command

:CALibration

:PROTected

:DC

:ZERO

:LOW <value>

:HIGH <value>

:LOHM <value>

:HOHM <value>

:OPEN

Calculate

User calibration subsystem.

Low-thermal short calibration step.

+2V DC calibration step.

+20V DC calibration step.

20k¾ calibration step.

1M¾ calibration step.

Open circuit calibration step.

DC cal constants.

:ZERO

(:CALibration:PROTected:DC):ZERO

To perform short-circuit comprehensive calibration.

:cal:prot:dc:zero

None

:ZERO performs the short-circuit calibration step in the comprehensive calibration procedure. A low-thermal short (Model 8610) must be connected to the input jacks before sending this command.

10 OUTPUT 716; “CAL:PROT:DC:ZERO” ! Do short-circuit cal.

:LOW

(:CALibration:PROTected:DC):LOW

To program the +2V DC comprehensive calibration step.

:cal:prot:dc:low <cal_voltage>

<Cal_voltage> = 1.0 to 2.0 [V]

:LOW programs the +2V DC comprehensive calibration step. The allowable range of the calibration voltage parameter is from 1.0 to 2.0V, but 2V is recommended for best results.

10 OUTPUT 716; “:CAL:PROT:DC:LOW 2” ! Program 2V step.

3-9

Calibration Command Reference

Purpose

Format

Parameters

Description

Programming example

Purpose

Format

Parameters

Description

Programming example

Purpose

Format

Parameters

Description

Programming example

:HIGH

(:CALibration:PROTected:DC):HIGH

To program the +20V DC comprehensive calibration step.

:cal:prot:dc:high <cal_voltage>

<Cal_voltage> = 10 to 20 [V]

:HIGH programs the +20V DC comprehensive calibration step. The allowable range of the calibration voltage parameter is from 10 to 20V, but 20V is recommended for best results.

10 OUTPUT 716; “:CAL:PROT:DC:HIGH 20” ! Program 20V step.

:LOHM

(CALibration:PROTected:DC):LOHM

To program the 20k¾ comprehensive calibration step.

:cal:prot:dc:lohm <cal_resistance>

<Cal_resistance> = 9E3 to 20E3 [¾]

:LOHM programs the 20k¾ comprehensive calibration step. The allowable range of the calibration resistance parameter is from 9k¾ to 20k¾ (9E3 to 20E3). Use the 20k¾ value whenever possible, or the closest possible value (for example, 19k¾, which is the closest value available on many calibrators).

10 OUTPUT 716; “:CAL:PROT:DC:LOHM 19E3” ! Program 19k¾.

:HOHM

(CALibration:PROTected:DC):HOHM

To program the 1M¾ comprehensive calibration step.

:cal:prot:dc:hohm <cal_resistance>

<Cal_resistance> = 800E3 to 2E6 [¾]

:LOHM programs the 1M¾ comprehensive calibration step. The resistance parameter can be programmed for any value from 800k¾ (800E3) to 2M¾ (2E6). Use the 1M¾ value whenever possible, or the closest possible value on your calibrator for best results.

10 OUTPUT 716; “:CAL:PROT:DC:HOHM 1E6” ! Program 1M¾ step.

3-10

Purpose

Format

Parameters

Description

Programming example

Calibration Command Reference

:CALCulate

(:CALibration:PROTected:DC):CALCulate

To program the Model 2001 to calculate new comprehensive calibration DC constants.

:cal:prot:dc:calc

None

The :CALCulate command should be sent to the instrument after performing all other DC calibration steps to calculate new comprehensive calibration constants. All other comprehensive calibration steps must be completed before sending this command.

10 OUTPUT 716; “:CAL:PROT:DC:CALC” ! Calculate new constants.

3-11

Calibration Command Reference

3.4 :CALibration:UNPRotected Subsystem

3.3.11

:ACCompensation

(:CALibration:UNPRotected):ACCompensation

Purpose

To perform user AC calibration.

Format

Parameters

Description

:cal:unpr:acc

None

The :ACC command performs user AC calibration, which requires no calibration equipment. All test leads must be disconnected from the input jacks when performing user AC calibration.

Programming note

Calibration constants generated by using the :ACC command are not stored in EEPROM.

Thus, AC calibration constants are in effect only until the instrument is turned off. In order to save AC calibration constants, perform the comprehensive calibration procedure, and use the :SAVE command.

Programming example

10 OUTPUT 716; “:CAL:UNPR:ACC: ! Perform AC user cal.

3-12

Calibration Command Reference

3.5 Bus error reporting

3.5.1 Calibration error summary

Table 3-4 summarizes errors that may occur during bus calibration.

NOTE

See Appendix C for a complete listing of calibration error messages.

Generating an SRQ on Error

To program the instrument to generate an SRQ when an error occurs, send the following command: *SRE 4. This command will enable SRQ when the EAV bit is set. You can then read the status byte and error queue as outlined above to check for errors and to determine the exact nature of the error.

3.5.2 Detecting calibration errors

Several methods to detect calibration errors are discussed in the following paragraphs.

Error Queue

As with other Model 2001 errors, any calibration errors will be reported in the bus error queue. You can read this queue by using the :SYST:ERR? query. The Model 2001 will respond with the appropriate error message, as summarized in

Table 3-4.

Status Byte EAV (Error Available) Bit

Whenever an error is available in the error queue, the EAV

(Error Available) bit (bit 2) of the status byte will be set. Use the *STB? query or serial polling to obtain the status byte, then test bit 2 to see if it is set. If the EAV bit is set, an error has occurred, and you can use the :SYST:ERR? query to read the error and at the same time clear the EAV bit in the status byte.

3.6 Detecting calibration step completion

When sending calibration commands over the IEEE-488 bus, you must wait until the instrument completes the current operation before sending a command. You can use either

*OPC? or *OPC to help determine when each calibration step is completed. (The example program in paragraph 2.6.2

uses the *OPC command to detect when each calibration step is completed.)

3.6.1 Using the *OPC? query

With the *OPC? (operation complete) query, the instrument will place an ASCII 1 in the output queue when it has completed each step. In order to determine when the OPC response is ready, do the following:

1. Repeatedly test the MAV (Message Available) bit (bit 4) in the status byte and wait until it is set. (You can request the status byte by using the *STB? query or serial polling.)

2. When MAV is set, a message is available in the output queue, and you can read the output queue and test for an

ASCII 1.

Table 3-4

Calibration error summary

Error Description

0, “No Error”

-102, “Syntax error”

-113, “Command header error”

-200, “Execution error”

-221, “Settings conflict”

-222, “Parameter data out of range”

+438, “Date of calibration not set”

+439, “Next date of calibration not set”

+440, “Calibration process not completed”

No error present in error queue.

Calibration command syntax error.

Invalid calibration command header.

Cal commands sent out of sequence.

Cal command sent with calibration locked.

Calibration parameter invalid.

No calibration date sent.

No next calibration date sent.

Incomplete calibration procedure.

3-13

Calibration Command Reference

3. After reading the output queue, repeatedly test MAV again until it clears. At this point, the calibration step is completed.

3.6.2 Using the *OPC command

The *OPC (operation complete) command can also be used to detect the completion of each calibration step. In order to use OPC to detect the end of each calibration step, you must do the following:

1. Enable operation complete by sending *ESE 1. The command sets the OPC (operation complete bit) in the standard event enable register, allowing operation complete status from the standard event status register to set the ESB (event summary bit) in the status byte when operation complete is detected.

2. Send the *OPC command immediately following each calibration command. For example:

:CAL:PROT:DC:ZERO;*OPC

Note that you must include the semicolon (;) to separate the two commands.

3. After sending a calibration command, repeatedly test the ESB (Event Summary) bit (bit 5) in the status byte until it is set. (Use either the *STB? query or serial polling to request the status byte.)

4. Once operation complete has been detected, clear OPC status using one of two methods: (1) Use the *ESR?

query then read the response to clear the standard event status register, or (2) Send the *CLS command to clear the status registers. Note that sending *CLS will also clear the error queue and operation complete status.

3-14

Model 2001 Specifications

A-1

Model 2001 Specifications

The following pages contain the complete specifications for the

2001. Every effort has been made to make these specifications complete by characterizing its performance under the variety of conditions often encountered in production, engineering and research.

The 2001 provides 5-minute, 1-hour, 24-hour, 90-day, 1-year, and 2-year specifications, with full specifications for the 90-day,

1-year and 2-year specifications. This allows the user to utilize

90-day, 1-year, or 2-year recommended calibration intervals, depending upon the level of accuracy desired. As a general rule, the 2001’s 2-year performance exceeds a 5 1 ⁄

-digit DMM’s 90day, 180-day or 1-year specifications. 6 1 ⁄

- or 7 1 ⁄

-digit performance is assured using 90-day or 1-year specifications.

ABSOLUTE ACCURACY

To minimize confusion, all 90-day, 1-year and 2-year 2001

specifications are absolute accuracy, traceable to NIST based on factory calibration. Higher accuracies are possible, based on your calibration sources. For example, calibrating with a 10V primary standard rather than a 20V calibrator will reduce calibration uncertainty, and can thereby improve total 2001 accuracy for measurements up to 50% of range. Refer to the 2001 calibration procedure for details.

TYPICAL ACCURACIES

Accuracy can be specified as typical or warranted. All specifications shown are warranted unless specifically noted.

Almost 99% of the 2001’s specifications are warranted specifications. In some cases it is not possible to obtain sources to maintain traceability on the performance of every unit in production on some measurements (e.g., high-voltage, highfrequency signal sources with sufficient accuracy do not exist).

Since these values cannot be verified in production, the values are listed as typical.

2001 SPECIFIED CALIBRATION INTERVALS

MEASUREMENT

FUNCTION

HOUR 1

DAY 2

YEAR 2

• DC Volts

DC Volts Peak Spikes

AC Volts rms

AC Volts Peak

AC Volts Average

AC Volts Crest Factor

Ohms

DC Current

DC In-Circuit Current

AC Current

Frequency

Temperature (Thermocouple)

Temperature (RTD)

•

• 3

•

• 3

•

YEAR 2

•

For T

CAL

±1°C.

2 For T

CAL

±5°C.

3 For

±2°C of last AC self cal.

DC VOLTS

DCV INPUT CHARACTERISTICS AND ACCURACY

RANGE

FULL

SCALE

RESO-

DEFAULT

RESO-

LUTION LUTION

INPUT

RESISTANCE 5 Minutes

ACCURACY 1

± (ppm of reading + ppm of range)

12 24 Hours 2 90 Days 3 1 Year 3 2 Years 3

200 mV

2 V

20 V

200 V

1000 V

±210.00000

±2.1000000

±21.000000

±210.00000

±1100.0000

10 nV

100 nV

μV

100

μV

100 nV

100

μV

1 mV

>10 G

10 M

Ω ±1%

10 M

Ω ±1%

3 + 3

2 + 1.5

10 + 1.5

10 + 6

7 + 2

7 + 4

13 + 3

17 + 6

25 + 6

18 + 2

18 + 4

27 + 3

31 + 6

37 + 6

25 + 2

24 + 4

38 + 3

41 + 6

DC VOLTAGE UNCERTAINTY =

±[ (ppm of reading) × (measured value) + (ppm of range) × (range used)] / 1,000,000.

% ACCURACY = (ppm accuracy) /10,000.

50 + 6

32 + 2

32 + 4

52 + 3

55 + 6

1PPM OF RANGE = 2 counts for ranges up to 200V, 1 count on 1000V range at 6 1 ⁄

digits.

TEMPERATURE COEFFICIENT

± (ppm of reading + ppm of range)/°C

Outside T

CAL

± 5°C

3.3 +1.5

2.6 +0.15

2.6 +0.7

4.3 +1

4.1 +1

SPEED AND ACCURACY 5

90 Days

RANGE

ACCURACY

± (ppm of reading+ppm of range+ppm of range rms noise

10 )

1PLC

DFILT On,

10 Readings

1PLC

DFILT Off

0.1PLC

DFILT Off

0.01PLC

DFILT Off

200 mV

2 V

20 V

200 V

1000 V

4 25+6+0

18+2+0

18+4+0

27+3+0

31+6+0

25+6+0.6

18+2+0.2

18+4+0.3

27+5+0.3

31+6+0.1

PLC = power line cycle; DFILT = digital filter

25+30+10

18+25+1

18+20+0.5

27+20+0.8

31+21+0.5

100+200+15

130+200+3

90+200+2

NOISE REJECTION (dB)

SPEED AC and DC CMRR 6

(Number of

Power Line Line Sync Internal

Cycles) On 7 Trigger 8

Line Sync On 7

25-Reading

DFILT On

AC NMRR

Line Sync Internal

Trigger

DFILT Off DFILT Off

NPLC = 10

NPLC

≥ 1

NPLC < 1

140

120

Effective noise is reduced by a factor of 10 for every 20dB of noise rejection (140dB reduces effective noise by 10,000,000:1).

CMRR is rejection of undesirable AC or DC signal between LO and earth. NMRR is rejection of undesirable AC signal between HI and LO.

DCV READING RATES 9,10

200mV, 2V, 200V Ranges

NPLC

MEASUREMENT

APERTURE

0.2

0.1

0.02

0.01

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

3.34 ms (4 ms)

1.67 ms (2 ms)

334

μs (400 μs)

167

μs (167 μs)

167

μs (167 μs)

20V, 1000V Ranges

0.2

0.1

0.02

0.01

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

3.34 ms (4 ms)

1.67 ms (2 ms)

334

μs (400 μs)

167

μs (167 μs)

167

μs (167 μs)

DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488

BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On

⁄

(5.1)

(25)

(48)

214 (186)

272 (272)

284 (287)

417 (417)

2000 (2000)

2 (1.7)

9 (7.6)

44 (34)

127 (112)

150 (148)

156 (155)

157 (157)

(23)

(45)

183 (162)

228 (225)

230 (230)

317 (317)

2000 (2000)

(1.6)

(7.3)

(32)

104 (101)

129 (123)

136 (134)

137 (134)

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

6 (4.1)

27 (22)

49 (41)

140 (126)

156 (153)

158 (156)

198 (198)

100

(1.6)

(7.2)

(30)

(85)

(96)

104 (103)

105 (103)

7 1 ⁄

6 1 ⁄

5 1 ⁄

4 1 ⁄

6 (5.1)

30 (25)

57 (48)

201 (186)

201 (201)

227 (227)

422 (422)

2000 (2000)

SETTLING CHARACTERISTICS: <500

μs to 10ppm of step size. Reading settling times are affected by source impedance and cable dielectric absorption characteristics. Add 10ppm of range for first reading after range change.

ZERO STABILITY: Typical variation in zero reading, 1 hour, T

REF

±1°C, 6

1 default resolution, 10-reading digital filter:

⁄

-digit

Range

2V – 1000V

200 mV

ZERO STABILITY

1 Power Line Cycle Integration 10 Power Line Cycle Integration

±3 counts

±5 counts

±2 counts

±3 counts

DC VOLTS NOTES

1. Specifications are for 1 power line cycle, Auto Zero on, 10-reading digital filter, except as noted.

2. For T

CAL

±1°C, following 55-minute warm-up. T

CAL

is ambient temperature at calibration, which is 23

°C from factory.

3. For T

CAL

±5°C, following 55-minute warm-up. Specifications include factory traceability to

US NIST.

4. When properly zeroed using REL function.

5. For T

CAL

±5°C, 90-day accuracy. 1-year or 2-year accuracy can be found by applying the same speed accuracy ppm changes to the 1-year or 2-year base accuracy.

6. Applies for 1k

Ω imbalance in the LO lead. For 400Hz operation, subtract 10dB.

7. For noise synchronous to the line frequency.

2 (1.7)

9 (8.2)

42 (38)

102 (113)

126 (116)

129 (129)

130 (130)

28 (23)

54 (45)

173 (162)

175 (173)

178 (178)

333 (333)

2000 (2000)

2 (1.6)

9 (7.8)

43 (35)

102 (99)

105 (105)

114 (114)

117 (117)

27 (22)

48 (41)

129 (127)

129 (128)

138 (138)

199 (199)

2 (1.6)

9 (7.7)

39 (32)

84 (83)

86 (86)

90 (90)

95 (95)

ISOLATED POLARITY REVERSAL ERROR: This is the portion of the instrument error that is seen when high and low are reversed when driven by an isolated source. This is not an additional error—it is included in the overall instrument accuracy spec. Reversal Error: <2 counts at 10V input at 6 1 ⁄

digits, 10 power line cycles, 10-reading digital filter.

INPUT BIAS CURRENT: <100pA at 25

°C.

LINEARITY: <1ppm of range typical, <2ppm maximum.

AUTORANGING: Autoranges up at 105% of range, down at 10% of range.

8. For line frequency

±0.1%.

9. See Operating Speed section for additional detail. For DELAY=0, internal trigger, digital filter off, display off (or display in “hold” mode). Aperture is reciprocal of line frequency.

These rates are for 60Hz and (50Hz).

10. Typical values.

1 1 .In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution or measurement function) once every 24 hours.

1 2 .DCV Transfer Stability typical applications are standard cell comparisons and relative accuracy measurements. Specs apply for 10 power line cycles, 20reading digital filter, autozero on with type synchronous, fixed range following

2-hour warm-up at full scale to 10% of full scale, at T

REF

± 1°C (T

REF

is the initial ambient temperature). Specifications on the 1000V range are for measurements within 5% of the initial measurement value and following measurement settling.

DCV PEAK SPIKES MEASUREMENT

REPETITIVE SPIKES ACCURACY

RANGE 0–1kHz 4

1kHz–

10kHz

90 Days,

± 2°C from last AC self-cal

10kHz–

30kHz

30kHz–

50kHz

50kHz–

100kHz

± (% of reading+% of range)

100kHz–

300kHz

TEMPERATURE COEFFICIENT

300kHz– 500kHz– 750kHz–

± (% of reading+% of range)/°C

500kHz 750kHz 1MHz Outside T

CAL

± 2°C

200 mV

200 V

1000

0.08+0.7

0.08+0.3

0.09+0.7

0.09+0.3

0.1 +0.6

Max. % of Range

±125%

0.08+0.7

0.08+0.3

0.1 +0.7

0.1 +0.3

0.13+0.6

±125%

0.1 +0.7

0.1 +0.3

0.12+0.7

0.17+0.7

0.12+0.3

0.17+0.3

0.16+0.6

±125%

0.15+0.7

0.15+0.3

0.25+0.6

±125%

0.25+0.7

0.25+0.3

0.25+0.7

0.25+0.3

0.5 +0.6

±125%

1.0+ 0.7

1.0+0.3

1.0+0.7

1.0+0.3

±125%

2.5+ 0.7

2.5+0.3

2.5+0.7

2.5+0.3

±125%

5.5+ 0.7

5.5+0.3

5.5+0.7

5.5+0.3

±100%

9+ 0.7

9+0.3

9+0.7

9+0.3

±75%

0.002+0.03

0.004+0.03

0.01 +0.02

REPETITIVE SPIKES ACCURACY

RANGE

200 mV

2 V

20 V

200 V

1000 V 3

0–1kHz 4

0.08+0.7

0.08+0.3

0.1 +0.7

0.1 +0.3

0.12+0.6

Max. % of Range

±125%

1kHz–

10kHz

1 or 2 Years, T

0.09+0.7

0.09+0.3

0.11+0.7

0.11+0.3

0.16+0.6

±125%

10kHz–

30kHz

CAL

± 5°C

30kHz–

50kHz

0.1 +0.7

0.1 +0.3

0.15+0.7

0.15+0.3

0.14+0.7

0.19+0.7

0.14+0.3

0.19+0.3

0.2 +0.6

0.25+0.6

±125% ±125%

± (% of reading+% of range)

50kHz–

100kHz

0.25+0.7

0.25+0.3

0.25+0.7

0.25+0.3

0.5 +0.6

±125%

100kHz–

300kHz

1.0+0.7

1.0+0.3

1.0+0.7

1.0+0.3

±125%

TEMPERATURE COEFFICIENT

300kHz– 500kHz– 750kHz–

± (% of reading+% of range)/°C

500kHz 750kHz 1MHz Outside T

CAL

± 5°C

2.5+0.7

2.5+0.3

2.5+0.7

2.5+0.3

5.5+0.7

5.5+0.3

5.5+0.7

5.5+0.3

9+0.7

9+0.3

9+0.7

9+0.3

0.002+0.03

0.004+0.03

0.01 +0.02

±125% ±100% ±75%

DEFAULT MEASUREMENT RESOLUTION: 3 1 ⁄

digits.

MAXIMUM INPUT:

±1100V peak value, 2×10

7 V•Hz (for inputs above 20V).

NON-REPETITIVE SPIKES: 10% of range per

μs typical slew rate.

SPIKE WIDTH: Specifications apply for spikes

≥1μs.

RANGE CONTROL: In Multiple Display mode, voltage range is the same as

DCV range.

SPIKES MEASUREMENT WINDOW: Default is 100ms per reading (settable from

0.1 to 9.9s in Primary Display mode).

INPUT CHARACTERISTICS: Same as ACV input characteristics.

SPIKES DISPLAY: Access as multiple display on DC Volts. First option presents positive peak spikes and highest spike since reset. Second option presents negative spikes and lowest spike. Highest and lowest spike can be reset by pressing DCV function button. Third option displays the maximum and minimum levels of the input signal. Spikes displays are also available through CONFIG-ACV-ACTYPE as primary displays.

DCV PEAK SPIKES NOTES

1. Specifications apply for 10-reading digital filter. If no filter is used, add 0.25% of range typical uncertainty.

2. Typical values.

3. Add 0.001% of reading

× (V

/100V) 2 additional uncertainty for inputs above 100V.

4. Specifications assume AC+DC coupling for frequencies below 200Hz. Below 20Hz add

0.1% of reading additional uncertainty.

AC VOLTS

AC magnitude: RMS or Average. Peak and Crest Factor measurements also available.

ACV INPUT CHARACTERISTICS

RMS

RANGE

PEAK

INPUT

FULL SCALE

RMS RESOLUTION

DEFAULT

RESOLUTION INPUT IMPEDANCE

200 mV

200

750

1 V

100 V

800 V

1100 V

210.0000

2.100000

21.00000

210.0000

775.000

100 nV

100

μV

1 mV

μV

100

μV

1 mV

10 mV

Ω ±2% with <140pF

AC VOLTAGE UNCERTAINTY =

±[ (% of reading) × (measured value) + (% of range ) × (range used) ] / 100.

PPM ACCURACY = (% accuracy)

× 10,000.

0.015% OF RANGE = 30 counts for ranges up to 200V and 113 counts on 750V range at 5 1 ⁄

digits.

TEMPERATURE COEFFICIENT 2

± (% of reading + % of range) / °C

Outside T

CAL

± 5°C

0.004 + 0.001

0.006 + 0.001

0.012 + 0.001

LOW FREQUENCY MODE RMS

RANGE 1–10Hz

10–50Hz

90 Days,

50–100Hz

± 2°C from last AC self-cal, for 1% to 100% of range

0.1–2kHz 2–10kHz 10–30kHz

± (% of reading + % of range)

30–50kHz 50–100kHz 100–200kHz 0.2–1MHz 1–2MHz

200 mV 0.09+0.015

0.04+0.015

0.03+0.015

0.035+0.015

0.05+0.015

0.17+0.015

0.5+0.025

2 V 0.09+0.015

0.04+0.015

0.03+0.015

0.035+0.015

0.05+0.015

0.17+0.015

0.5+0.025

20 V 0.1 +0.015

0.05+0.015

0.04+0.015

0.06+0.015

0.08 +0.015

0.1 +0.015

0.17+0.015

0.5+0.025

200 V 4 0.1 +0.015

0.05+0.015

0.04+0.015

0.06+0.015

0.08 +0.015

0.1 +0.015

0.17+0.015

0.5+0.025

750 V 4 0.13+0.015

0.09+0.015

0.08+0.015

0.09+0.015

0.12 +0.015

0.15+0.015

5 0.5 +0.015

LOW FREQUENCY MODE RMS

RANGE 1–10Hz

10–50Hz

1 or 2 Years, T

50–100Hz

CAL

± 5°C for 1% to 100% of range

0.1–2kHz 2–10kHz

10–30kHz

2+0.1

4+0.2

5+0.2

7+0.2

± (% of reading + % of range)

30–50kHz 50–100kHz 100–200kHz 0.2–1MHz 1–2MHz

200 mV 0.11+0.015

0.06+0.015

0.05+0.015

0.05 +0.015

0.05+0.015

0.06+0.015

0.17+0.015

0.5+0.025

2 V 0.11+0.015

0.06+0.015

0.05+0.015

0.05 +0.015

0.05+0.015

0.06+0.015

0.17+0.015

0.5+0.025

20 V 0.12+0.015

0.07+0.015

0.06+0.015

0.085+0.015

0.12+0.015

0.13+0.015

0.17+0.015

0.5+0.025

200 V 4 0.12+0.015

0.07+0.015

0.06+0.015

0.085+0.015

0.12+0.015

0.13+0.015

0.17+0.015

0.5+0.025

750 V 4 0.15+0.015

0.11+0.015

0.1 +0.015

0.13 +0.015

0.18+0.015

0.22+0.015

5 0.5 +0.015

2+0.1

4+0.2

5+0.2

7+0.2

AC VOLTS (cont’d)

NORMAL MODE RMS 1

RANGE

90 Days,

± 2°C from last AC self-cal for 1% to 100% of range

20–50Hz 50–100Hz 0.1–2kHz 2–10kHz 10–30kHz

± (% of reading + % of range)

30–50kHz 50–100kHz 100–200kHz 0.2–1MHz 1–2MHz

200 mV

2 V

20 V

200 V 4

750 V 4

0.25+0.015

0.07+0.015

0.03+0.015

0.035+0.015

0.05+0.015

0.17+0.015

0.5+0.025

0.25+0.015

0.07+0.015

0.03+0.015

0.035+0.015

0.05+0.015

0.17+0.015

0.5+0.025

0.25+0.015

0.07+0.015

0.04+0.015

0.06+0.015

0.08 +0.015

0.1 +0.015

0.25+0.015

0.07+0.015

0.04+0.015

0.06+0.015

0.08 +0.015

0.1 +0.015

0.25+0.015

0.1 +0.015

0.08+0.015

0.09+0.015

0.12 +0.015

0.15+0.015

0.17+0.015

0.5 +0.015

0.5+0.025

0.17+0.015

0.5+0.025

2+0.1

4+0.2

5+0.2

7+0.2

NORMAL MODE RMS 1

RANGE 20–50Hz

1 or 2 Years, T

CAL

± 5°C for 1% to 100% of range

50–100Hz 0.1–2kHz 2–10kHz

± (% of reading + % of range)

10–30kHz 30–50kHz 50–100kHz 100–200kHz 0.2–1MHz 1–2MHz

200 mV

2 V

20 V

200 V 4

750 V

0.25+0.015

0.08+0.015

0.05+0.015

0.05 +0.015

0.05+0.015

0.06+0.015

0.17+0.015

0.5+0.025

0.25+0.015

0.08+0.015

0.05+0.015

0.05 +0.015

0.05+0.015

0.06+0.015

0.17+0.015

0.5+0.025

0.25+0.015

0.08+0.015

0.06+0.015

0.085+0.015

0.12+0.015

0.13+0.015

0.17+0.015

0.5+0.025

0.25+0.015

0.08+0.015

0.06+0.015

0.085+0.015

0.12+0.015

0.13+0.015

0.17+0.015

0.5+0.025

0.27+0.015

0.11+0.015

0.1 +0.015

0.13 +0.015

0.18+0.015

0.22+0.015

0.5 +0.015

2+0.1

4+0.2

5+0.2

7+0.2

dB ACCURACY RMS

± dB, 90 Days, 1 or 2 Years, T

CAL

± 5°C, Reference=1V, Autoranging, Low Frequency Mode, AC+DC Coupling

0.2–1MHz INPUT

–54 to–40 dB (2 mV to 10 mV)

–40 to–34 dB (10 mV to 20 mV)

–34 to 6 dB (20 mV to 2 V)

6 to 26 dB (2 V to 20 V)

26 to 46 dB (20 V to 200 V)

46 to 57.8 dB (200 V to 775 V)

1–100Hz

0.230

0.036

0.023

0.024

0.018

0.1–30kHz

0.225

0.031

0.018

0.024

0.021

30–100kHz

0.236

0.041

0.028

0.049

100–200kHz

0.355

0.088

0.066

0.265

0.538

1–2MHz

0.630

0.820

ACV READING RATES 5,6

NPLC

0.1

0.01

MEASUREMENT

APERTURE

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

1.67 ms (2 ms)

167

μs (167 μs)

167

μs (167 μs)

DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488

BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On

6 1 ⁄

5 1 ⁄

4 1 ⁄

6 (5.1)

30 (24)

57 (48)

136 (136)

140 (140)

2000 (2000)

2 (1.7)

9 (7.9)

38 (35)

70 (70)

71 (71)

28 (23)

53 (45)

122 (122)

127 (127)

2000 (2000)

2 (1.6)

9 (7.6)

36 (33)

64 (64)

66 (66)

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

27 (22)

48 (41)

98 (98)

99 (99)

2 (1.5)

9 (7.5)

34 (30)

56 (56)

58 (58)

AC COUPLING:

For AC only coupling, add the following % of reading:

1–10Hz 10–20Hz 20–50Hz 50–100Hz 100–200Hz

Normal Mode

(rms, average)

Low Frequency Mode

(rms)

—

0.1

—

0.01

0.41

0.07

0.015

For low frequency mode below 200Hz, specifications apply for sine wave inputs only.

AC+DC COUPLING:

For DC>20% of AC rms voltage, apply the following additional uncertainty, multiplied by the ratio (DC/AC rms). Applies to rms and average measurements.

RANGE % of Reading % of Range

200mV, 20V

2V, 200V, 750V

0.05

0.07

0.1

0.01

ACV CREST FACTOR MEASUREMENT 11

CREST FACTOR = Peak AC / rms AC.

CREST FACTOR RESOLUTION: 3 digits.

CREST FACTOR ACCURACY: Peak AC uncertainty + AC normal mode rms uncertainty.

MEASUREMENT TIME: 100ms plus rms measurement time.

INPUT CHARACTERISTICS: Same as ACV input.

CREST FACTOR FREQUENCY RANGE: 20Hz – 1MHz.

CREST FACTOR DISPLAY: Access as multiple display on AC volts.

AVERAGE ACV MEASUREMENT

Normal mode rms specifications apply from 10% to 100% of range, for 20Hz–

1MHz. Add 0.025% of range for 50kHz–100kHz, 0.05% of range for 100kHz–

200kHz, and 0.5% of range for 200kHz–1MHz.

HIGH CREST FACTOR ADDITIONAL ERROR

± (% of reading)

Applies to rms measurements.

CREST FACTOR:

ADDITIONAL ERROR:

1 – 2

2 – 3

0.1

3 – 4

0.2

4 – 5

0.4

ACV PEAK VALUE MEASUREMENT

RANGE

200 mV

2 V

20 V

200 V

750 V

Valid % of Range 7

20Hz–

1kHz 9

0.08+0.7

0.08+0.3

0.1 +0.7

0.1 +0.3

0.12+0.6

10–400%

1kHz–

10kHz

10kHz–

30kHz

0.09+0.7

0.09+0.3

0.11+0.7

0.11+0.3

0.16+0.6

0 .1 +0.7

0 .1 +0.3

0.14+0.7

0.14+0.3

0.2 +0.6

10–400% 10–400%

REPETITIVE PEAK ACCURACY,

± (% of reading+% of range), 90 Days, 1 Year or 2 Years, T

CAL

± 5°C

30kHz–

50kHz

50kHz–

100kHz

0.15+0.7

0.25+0.7

0.15+0.3

0.25+0.3

0.19+0.7

0.25+0.7

0.19+0.3

0.25+0.3

0.25+0.6

10–350%

5 0.5 +0.6

10–350%

DEFAULT MEASUREMENT RESOLUTION: 4 digits.

NON-REPETITIVE PEAK: 10% of range per

μs typical slew rate for single spikes.

PEAK WIDTH: Specifications apply for all peaks

≥1μs.

100kHz–

300kHz

1.0+0.7

1.0+0.3

1.0+0.7

1.0+0.3

TEMPERATURE COEFFICIENT

300kHz– 500kHz– 750kHz–

± (% of reading+% of range)/°C

500kHz 750kHz 1MHz Outside T

CAL

± 5°C

2.5+0.7

2.5+0.3

2.5+0.7

2.5+0.3

5.5+0.7

5.5+0.3

5.5+0.7

5.5+0.3

9+0.7

9+0.3

9+0.7

9+0.3

0.002 + 0.03

0.004 + 0.03

0.01 + 0.02

10–150% 10–100% 7.5–75% 10–250%

PEAK MEASUREMENT WINDOW: 100ms per reading.

MAXIMUM INPUT:

±1100V peak, 2×10

V•Hz (for inputs above 20V).

AC VOLTS (cont’d)

SETTLING CHARACTERISTICS:

Normal Mode (rms, avg.)

<300ms to 1% of step change

<450ms to 0.1% of step change

<500ms to 0.01% of step change

Low Frequency Mode (rms)

<5s to 0.1% of final value

AC VOLTS NOTES

1. Specifications apply for sinewave input, AC + DC coupling, 1 power line cycle, digital filter off, following 55 minute warm-up.

2. Temperature coefficient applies to rms or average readings. For frequencies above

100kHz, add 0.01% of reading/

°C to temperature coefficient.

3. For 1% to 5% of range below 750V range, and for 1% to 7% of 750V range, add 0.01% to range uncertainty. For inputs from 200kHz to 2MHz, specifications apply above 10% of range.

4. Add 0.001% of reading

× (V

/100V) 2 additional uncertainty above 100V rms.

5. Typical values.

6. For DELAY=0, digital filter off, display off (or display in “hold” mode). Internal Trigger,

Normal mode. See Operating Speed section for additional detail. Aperture is reciprocal of line frequency. These rates are for 60Hz and (50Hz). Applies for rms and average mode.

Low frequency mode rate is typically 0.2 readings per second.

COMMON MODE REJECTION: For 1k

Ω imbalance in either lead: >60dB for line frequency

±0.1%.

MAXIMUM VOLT•Hz PRODUCT: 2

× 10

7 V•Hz (for inputs above 20V).

AUTORANGING: Autoranges up at 105% of range, down at 10% of range.

7. For overrange readings 200–300% of range, add 0.1% of reading. For 300–400% of range, add 0.2% of reading.

8. In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution or measurement function) once every 24 hours.

9. AC peak specifications assume AC + DC coupling for frequencies below 200Hz.

10. Specifications apply for 10 reading digital filter. If no filter is used, add 0.25% of range typical uncertainty.

11. Subject to peak input voltage specification.

OHMS

TWO-WIRE AND FOUR-WIRE OHMS (2W and 4W Ohms Functions)

RANGE

200

2 k

20 k

200 k

2 M

20 M

200 M

1 G

FULL

SCALE

21.000000

210.00000

2100.0000

21.000000

210.00000

2.1000000

21.000000

210.00000

1.0500000

RESOLUTION

μΩ

100

μΩ

1 m

10 m

100 m

100

DEFAULT

RESOLUTION

μΩ

100

μΩ

1 m

10 m

100 m

100

1 k

CURRENT 1

SOURCE

9.2

0.98 mA

μA

770

μA nA

70 nA

4.4

OPEN

CIRCUIT 12

5 V

MAXIMUM

LEAD

RESISTANCE 2

1.7

100

1.5 k

MAXIMUM

OFFSET

COMPENSATION 3

±0.2 V

–0.2 V to +2 V

TEMPERATURE

COEFFICIENT

± (ppm of reading +

ppm of range)/

°C

Outside T

CAL

± 5°

8 + 1.5

4 + 1.5

2.5 + 0.2

4 + 0.2

11 + 0.2

25 + 0.2

250 + 0.2

4000 + 10

RESISTANCE ACCURACY 5

RANGE 24 Hours 6

± (ppm of reading + ppm of range)

90 Days 7 1 Year 7 2 Years 7

200

2 k

20 k

200 k

2 M

20 M

200 M

1 G

29 +

24 +

22 +

19 +

20 +

50 +

160 +

4.5

3000 + 100

9000 + 100

52 +

36 +

33 +

32 +

72 +

110 +

560 +

4.5

10000 + 100

20000 + 100

72 +

56 +

50 +

90 +

160 +

900 +

4.5

20000 + 100

40000 + 100

110 +

90 +

80 +

130 +

230 +

1100 +

4.5

30000 + 100

60000 + 100

RESISTANCE UNCERTAINTY =

± [ (ppm of reading) × (measured value) + (ppm of range)

× (range used) ] / 1,000,000.

% ACCURACY = (ppm accuracy) / 10,000.

1PPM OF RANGE = 2 counts for ranges up to 200M

Ω and 1 count on 1GΩ range at 6 1 ⁄

digits.

SPEED AND ACCURACY 9 90 Days

ACCURACY

± (ppm of reading+ppm of range+ppm of range rms noise

1PLC 0.1PLC

11 0.01PLC

12 )

8,11

DFILT Off DFILT Off DFILT Off RANGE

200

2 k

20 k

200 k

2 M

20 M

200 M

1 G

52+ 7+0.6

36+ 7+0.6

33+ 4+0.2

32+ 4+0.2

72+ 4.5+0.5

110+ 4.5+ 2

560+ 4.5+ 5

10,000+100+ 40

20,000+100+ 40

52+ 30+10

36+ 30+10

33+ 24+ 1

32+ 24+ 2

72+ 25+ 4

110+ 25+15

560+ 30+20

10,000+120+80

20,000+120+80

110+200+ 35

130+230+ 5

150+300+ 10

150+300+150

560+300+150

10,000+700+250

20,000+700+250

PLC = Power Line Cycles. DFILT = Digital Filter.

2-WIRE ACCURACY 7

± (ppm of range)

RANGE

ADDITIONAL UNCERTAINTY

(inside T

CAL

± 5°C)

TEMPERATURE COEFFICIENT

(outside T

CAL

± 5°C)

300 ppm

70ppm/

°C

200

30 ppm

7ppm/

°C

2 k

3 ppm

0.7ppm/

°C

SETTLING CHARACTERISTICS: For first reading following step change, add the total 90-day measurement error for the present range. Pre-programmed settling delay times are for <200pF external circuit capacitance. For 200M

Ω and 1G

Ω ranges, add total 1 year errors for first reading following step change. Reading settling times are affected by source impedance and cable dielectric absorption characteristics.

OHMS MEASUREMENT METHOD: Constant current.

OFFSET COMPENSATION: Available on 20

Ω – 20kΩ ranges.

OHMS VOLTAGE DROP MEASUREMENT: Available as a multiple display.

AUTORANGING: Autoranges up at 105% of range, down at 10% of range.

OHMS (cont’d)

2-WIRE RESISTANCE READING RATES 10,12 20

Ω, 200Ω, 2kΩ, and 20kΩ Ranges

NPLC

MEASUREMENT

APERTURE

0.2

0.1

0.02

0.01

8,11

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

3.34 ms (4 ms)

1.67 ms (2 ms)

334

μs (400 μs)

167

μs (167 μs)

167

μs (167 μs)

DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488

BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On

7 1 ⁄

6 1 ⁄

5 1 ⁄

4 1 ⁄

2-WIRE RESISTANCE READING RATES

10,12

6 (5.1)

30 (25)

58 (48)

219 (189)

300 (300)

421 (421)

2000 (2000)

20M

Ω Range

2 (1.7)

8 (7.1)

40 (34)

109 (97)

126 (118)

130 (130)

135 (135)

5 (4)

28 (23)

53 (45)

197 (162)

248 (245)

249 (249)

306 (306)

2000(2000)

2 (1.6)

8 (6.8)

37 (32)

97 (87)

112 (108)

114 (114)

NPLC

MEASUREMENT

APERTURE

DEFAULT READINGS/SECOND TO MEMORY

BITS DIGITS Auto Zero Off Auto Zero On

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

167 ms (200 ms)

33.4 ms (40 ms)

1 16.7 ms (20 ms)

0.1

0.01

1.67 ms (2 ms)

0.02

334

μs (400 μs)

167

μs (167 μs)

7 1 ⁄

⁄

6 1

5 1

⁄

4 1 ⁄

6 (5.1)

30 (25)

58 (48)

300 (296)

300 (300)

412 (412)

1 (0.8)

4 (3.8)

5 (5)

2 (1.8)

16(14.5)

25 (22)

43 (39)

43 (43)

1 (0.8)

4 (3.5)

5 (4.7)

5 (5)

4-WIRE RESISTANCE READING RATES 10,12

NPLC

0.1

0.01

MEASUREMENT

APERTURE

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

1.67 ms (2 ms)

167

μs (167 μs)

DEFAULT

BITS DIGITS

1 ⁄

⁄

Any Range

READINGS or READINGS WITH TIME STAMP/SECOND

TO MEMORY or IEEE-488, AUTO ZERO ON

Offset Comp. Off Offset Comp. On

2 (1.6)

7 (6.1)

12 (11.6)

20 (20)

21 (21)

0.6

(0.5)

2 (1.6)

3 (3.7)

6 (6)

7 (7)

OHMS NOTES

1. Current source is typically

±9% absolute accuracy.

2. Total of measured value and lead resistance cannot exceed full scale.

3. Maximum offset compensation plus source current times measured resistance must be less than source current times resistance range selected.

4. For 2-wire mode.

5. Specifications are for 1 power line cycle, 10 reading digital filter, Auto Zero on, 4-wire mode, offset compensation on (for 20

Ω to 20kΩ ranges).

6. For T

CAL

±1°C, following 55 minute warm-up. T

CAL

is ambient temperature at calibration

(23

°C at the factory).

7. For T

CAL

±5°C, following 55-minute warm-up. Specifications include traceability to US

NIST.

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

5 (4)

27 (22)

49 (41)

140 (129)

164 (163)

165 (165)

189 (189)

(1.6)

(6.7)

(31)

(74)

(88)

(91)

(92)

8. In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution or measurement function) once every 24 hours.

9. For T

CAL

±5°C, 90-day accuracy. 1-year and 2-year accuracy can be found by applying the same speed accuracy ppm changes to the 1-year or 2-year base accuracy.

10. For DELAY=0, digital filter off, internal trigger, display off. Aperture is reciprocal of line frequency. These rates are for 60Hz and (50Hz). Speed for 200k

Ω range is typically 10% slower than 20k

Ω range; speed for 2MΩ range is typically 3 times faster than 20MΩ range; speed for 1G

Ω range is typically 30%–50% as fast as 20MΩ range. See Operating Speed section for additional detail.

11. Ohms measurements at rates lower than 1 power line cycle are subject to potential noise pickup. Care must be taken to provide adequate shielding.

12. Typical values.

DC AMPS

DCI INPUT CHARACTERISTICS AND ACCURACY 4

RANGE

FULL

SCALE

DEFAULT

MAXIMUM

BURDEN

RESOLUTION RESOLUTION VOLTAGE 6

± (ppm of reading + ppm of range)

24 Hours 2

ACCURACY 1

90 Days 3 1 Year 3 2 Years 3

TEMPERATURE COEFFICIENT

± (ppm of reading + ppm of range)/°C

Outside T

CAL

± 5°C

200

μA 210.00000

2 mA

20 mA

200 mA

2 A

2.1000000

21.000000

210.00000

2.1000000

10 pA

100 pA

1 nA

10 nA

100 nA

100 pA

1 nA

10 nA

100 nA

μA

0.25 V

0.31 V

0.4 V

0.5 V

1.5 V

63 + 25

64 + 20

65 + 20

96 + 20

500 + 20

300 + 25

300 + 20

600 + 20

500 + 25

400 + 20

500 + 20

900 + 20

DC CURRENT UNCERTAINTY =

±[ (ppm reading)×(measured value) + (ppm of range)×(range used)] / 1,000,000.

% ACCURACY = (ppm accuracy) / 10,000.

1350 + 25

750 + 20

1350 + 20

58 + 7

58 + 5

10PPM OF RANGE = 20 counts at 6 1 ⁄

digits.

DCI READING RATES 5,9

NPLC

0.2

0.1

0.02

0.01

MEASUREMENT

APERTURE

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

3.34 ms (4 ms)

1.67 ms (2 ms)

334

μs (400 μs)

167

μs (167 μs)

167

μs (167 μs)

DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488

BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On

⁄

(5.1)

(24)

(48)

217 (195)

279 (279)

298 (298)

2000 (2000)

2 (1.7)

10 (8.2)

45 (38)

122 (111)

144 (144)

148 (148)

150 (150)

(4.8)

(23)

(45)

186 (168)

234 (229)

234 (234)

245 (245)

2000 (2000)

109

(1.6)

(7.8)

(35)

(98)

123 (123)

130 (130)

132 (132)

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

6 (4.8)

27 (22)

48 (41)

135 (125)

158 (156)

158 (158)

164 (164)

(1.6)

(7.7)

(32)

(85)

(98)

101 (101)

102 (102)

DC AMPS (cont’d)

SPEED AND ACCURACY 8 90 Days

ACCURACY

± (ppm of reading+ppm of range+ppm of range rms noise

1PLC 0.1PLC

0.01PLC

9 )

DFILT Off DFILT Off DFILT Off RANGE

200

μA

2 mA

20 mA

200 mA

2 A

300+25+0.3

300+20+0.3

600+20+0.3

300+50+8

300+45+8

600+45+8

300+200+80

600+200+80

PLC = Power Line Cycle. DFILT = Digital Filter.

DC AMPS NOTES

1. Specifications are for 1 power line cycle, Auto Zero on, 10 reading digital filter.

2. For T

CAL

± 1°C, following 55 minute warm-up.

3. For T

CAL

± 5°C, following 55 minute warm-up. Specifications include traceability to US

NIST.

4. Add 50 ppm of range for current above 0.5A for self heating.

5. For DELAY=0, digital filter off, display off. Internal trigger. Aperture is reciprocal of line frequency. These rates are for 60Hz and (50Hz). See Operating Speed section for additional detail.

SETTLING CHARACTERISTICS: <500

μs to 50ppm of step size. Reading settling times are affected by source impedance and cable dielectric absorption characteristics. Add 50ppm of range for first reading after range change.

MAXIMUM ALLOWABLE INPUT: 2.1A, 250V.

OVERLOAD PROTECTION: 2A fuse (250V), accessible from front (for front input) and rear (for rear input).

AUTORANGING: Autoranges up at 105% of range, down at 10% of range.

6. Actual maximum voltage burden = (maximum voltage burden)

× (I

MEASURED

FULL SCALE

7. In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution or measurement function) once every 24 hours.

8. For T

CAL

±5°C, 90-day accuracy. 1-year and 2-year accuracy can be found by applying the same speed accuracy ppm changes to the 1-year or 2-year base accuracy.

9. Typical values.

DC IN-CIRCUIT CURRENT

The DC in-circuit current measurement function allows a user to measure the current through a wire or a circuit board trace without breaking the circuit.

When the In-Circuit Current Measurement function is selected, the 2001 will first perform a 4-wire resistance measurement, then a voltage measurement, and will display the calculated current.

TYPICAL RANGES:

Current:

100

μA to 12A.

Trace Resistance:

Ω to 10Ω typical.

Voltage:

±200mV max. across trace.

Speed:

Accuracy:

4 measurements/second at 1 power line cycle.

±(5% + 2 counts). For 1 power line cycle, Auto Zero on, 10 reading digital filter, T

CAL

±5°C, after being properly zeroed.

90 days, 1 year or 2 years.

AC AMPS

AC magnitude: RMS or Average.

ACI INPUT CHARACTERISTICS

MEASUREMENT RANGE CHART

100m

10m

100

μA

Specified

Measurement

Range

1mA 10mA 100mA 1A

Measured Current

10A 100A

RMS

RANGE

200

μA

2 mA

20 mA

200 mA

2 A

PEAK

INPUT

1 mA

10 mA

100 mA

1 A

2 A

FULL SCALE

RMS

210.0000

2.100000

21.00000

210.0000

2.100000

RESOLUTION

100 pA

1 nA

10 nA

100 nA

μA

DEFAULT

RESOLUTION

1 nA

10 nA

100 nA

μA

MAXIMUM

BURDEN

VOLTAGE 5

0.25 V

0.31 V

0.4 V

0.5 V

1.5 V

TEMPERATURE

COEFFICIENT

± (% of reading + % of range)/°C

Outside T

CAL

± 5°C

0.01 + 0.001

ACI ACCURACY 1,2

90 Days, 1 Year or 2 Years, T

CAL

± 5°C, for 5% to 100% of range, ± (% of reading + % of range)

10kHz–30kHz 3 RANGE

200

μA

2 mA

20 mA

200 mA

2 A

20Hz–50Hz

0.35 + 0.015

0.3 + 0.015

0.35 + 0.015

50Hz–200Hz

0.2 + 0.015

0.15 + 0.015

0.2 + 0.015

200Hz–1kHz

0.4 + 0.015

0.12 + 0.015

0.3 + 0.015

1kHz–10kHz

0.5 + 0.015

0.12 + 0.015

0.15 + 0.015

0.45 + 0.015

0.25 + 0.015

0.5 + 0.015

1.5 + 0.015

30kHz–50kHz 3

0.3 + 0.015

1 + 0.015

4 + 0.015

AC CURRENT UNCERTAINTY =

±[ (% of reading) × (measured value) + (% of range)

× (range used) ] / 100.

PPM ACCURACY = (% accuracy)

× 10,000.

0.015% OF RANGE = 30 counts at 5 1 ⁄

digits.

AC COUPLING:

rms, Average

50kHz–100kHz 3

0.5 + 0.015

3 + 0.015

For AC only coupling, add the following % of reading:

20–50Hz

0.55

50–100Hz

0.09

100–200Hz

0.015

AC+DC COUPLING:

For DC>20% of AC rms voltage, apply the following additional uncertainty, multiplied by the ratio (DC/AC rms).

% of Reading % of Range rms, Average

0.05

0.1

AC AMPS (cont’d)

ACI READING RATES 3,4

NPLC

0.1

0.01

MEASUREMENT

APERTURE

167 ms (200 ms)

33.4 ms (40 ms)

16.7 ms (20 ms)

1.67 ms (2 ms)

167

μs (167 μs)

167

μs (167 μs)

DEFAULT READINGS/SECOND TO MEMORY READINGS/SECOND TO IEEE-488

BITS DIGITS Auto Zero Off Auto Zero On Auto Zero Off Auto Zero On

⁄

(5.1)

(25)

(48)

157 (136)

156 (136)

2000 (2000)

2 (1.7)

9 (7.9)

39 (35)

70 (70)

(4.9)

(23)

(45)

123 (123)

140 (140)

2000 (2000)

(1.6)

(7.6)

(33)

(62)

(63)

READINGS/SECOND WITH

TIME STAMP TO IEEE-488

Auto Zero Off Auto Zero On

6 (4.8)

27 (22)

49 (41)

107 (107)

113 (113)

(1.6)

(7.5)

(30)

(53)

(56)

SETTLING CHARACTERISTICS: <300ms to 1% of step change

<450ms to 0.1% of step change

<500ms to 0.01% of step change

AUTORANGING: Autoranges up at 105% of range, down at 10% of range.

HIGH CREST FACTOR ADDITIONAL ERROR

± (% of reading)

Applies to rms measurements.

CREST FACTOR

ADDITIONAL ERROR

1 – 2

2 – 3

0.1

3 – 4

0.2

4 – 5

0.4

AVERAGE ACI MEASUREMENT

Rms specifications apply for 10% to 100% of range.

AC AMPS NOTES

1. Specifications apply for sinewave input, AC+DC coupling, 1 power line cycle, digital filter off, following 55 minute warm-up.

2. Add 0.005% of range uncertainty for current above 0.5A rms for self-heating.

3. Typical values.

4. For DELAY=0, digital filter off, display off, internal trigger. Aperture is reciprocal of line frequency. These rates are for 60Hz and (50Hz).

5. Actual maximum voltage burden = (maximum voltage burden)

× (I

MEASURED

FULL SCALE

6. In burst mode, display off. Burst mode requires Auto Zero refresh (by changing resolution or measurement function) once every 24 hours.

FREQUENCY COUNTER

FREQUENCY/PERIOD INPUT CHARACTERISTICS AND ACCURACY

FREQUENCY

RANGE

PERIOD

RANGE

DEFAULT

RESOLUTION

AC Voltage Input

AC Current Input

1Hz–15 MHz

1Hz– 1 MHz

67 ns – 1 s

μs – 1 s

5 digits

MEASUREMENT TECHNIQUE: Unique pulse count/time count at overflow.

TIME BASE: 7.68MHz

± 0.01%, 0°C to 55°C.

READING TIME: 420ms maximum.

60 mV

150

μA

90 Days, 1 Year, or 2 Years

MINIMUM SIGNAL LEVEL

1Hz–1MHz 1–5MHz 5–15MHz

60 mV 350 mV

MAXIMUM

INPUT

1100 V pk 1

1 A pk

TRIGGER

LEVEL

0–600V

0–600mA

ACCURACY

± (% of reading)

0.03

TRIGGER LEVEL ADJUSTMENT: Trigger level is adjustable in 0.5% of range steps to

±60% of range in real-time using the up and down range buttons.

FREQUENCY RANGING: Autoranging from Hz to MHz.

FREQUENCY COUPLING: AC + DC or AC only.

FREQUENCY NOTES

1. Subject to 2

× 10

7 V•Hz product (for inputs above 20V).

TEMPERATURE (RTD)

RANGE

–100

° to +100°C

–200

° to +630°C

–212

° to +180°F

–360

° to +1102°F

RESO-

LUTION

0.001

°C

0.001

°C

0.001

°F

0.001

°F

4-WIRE ACCURACY 3

1 Hour

90 Days 1 Year 2 Years

±0.005°C ±0.05°C ±0.08°C ±0.12°C

±0.005°C ±0.12°C ±0.14°C ±0.18°C

±0.009°F ±0.09°F ±0.15°F ±0.22°F

±0.009°F ±0.15°F ±0.18°F ±0.33°F

RTD TYPE: 100

Ω platinum; DIN 43 760 or IPTS-68, alpha 0.00385, 0.00390,

0.003916, or 0.00392, 4-wire.

MAXIMUM LEAD RESISTANCE (each lead): 12

Ω (to achieve rated accuracy).

SENSOR CURRENT: 1mA (pulsed).

COMMON MODE REJECTION: <0.005

°C/V at DC, 50Hz, 60Hz and 400Hz,

(100

Ω imbalance, LO driven).

TEMPERATURE COEFFICIENT:

±(0.0013% + 0.005°C)/°C or ±(0.0013% + 0.01°F)/

°C outside T

CAL

±5°C.

RTD TEMPERATURE READING RATES 1

(2- or 4-Wire)

NPLC

READINGS or READINGS WITH TIME STAMP/SECOND

TO MEMORY or IEEE-488

Auto Zero Off Auto Zero On

0.1

0.01

1 (1)

5 (4.3)

7 (6.5)

12 (10.8)

12 (12)

1 (1)

4 (3.6)

6 (5.5)

9 (9)

10 (10)

TEMPERATURE (Thermocouple)

THERMO-

COUPLE

TYPE

RANGE

–200

° to + 760°C

–200

° to +1372°C

–200

° to + 400°C

–200

° to +1000°C

° to +1768°C

+350

° to +1820°C

DEFAULT

RESOLUTION

0.1

°C

0.1

°C

0.1

°C

0.1

°C

ACCURACY 4

±0.5°C

±0.6°C

±3 °C

±5 °C

TC TEMPERATURE READING RATES 1

NPLC

READINGS/SECOND

READINGS/SECOND READINGS/SECOND WITH TIME STAMP

TO MEMORY

Auto Zero

Off On

TO IEEE-488

Auto Zero

Off On

TO IEEE-488

Auto Zero

Off On

0.1

6 (5.1)

30 (25)

2 (1.7)

9 (7.6)

57 (48) 43 (37)

139 (139) 95 (95)

0.01

177 (177) 98 (98)

4 (3.4) 2 (1.4)

28 (23) 9 (7.3)

53 (45) 40 (32)

126 (123) 85 (84)

156 (156) 87 (87)

4 (3.4) 2 (1.4)

27 (22) 8 (7.2)

49 (41) 37 (30)

99 (99) 72 (72)

119 (119) 73 (73)

TEMPERATURE NOTES

1. Typical speeds for Auto Zero on. For DELAY=0, digital filter off, display off, internal trigger. Rates are for 60Hz and (50Hz).

2. For ambient temperature

±1°C, measured temperature ±10°C, 10-reading digital filter.

3. Excluding probe errors. T

CAL

±5°C.

4. Relative to external 0

°C reference junction; exclusive of thermocouple errors. Junction temperature may be external. Applies for 90 days, 1 year or 2 years, T

CAL

±5°C.

OPERATING SPEED

The following diagram illustrates the factors that determine a DMM’s reading rate.

GPIB

Command

Receive and

Interpret

Stored

Setup

Change

Trigger

Link or

Ext.

Trigger

Function,

Speed or

Range

Change

Measurement

Settle

Auto Zero

Off

Trigger Control

Auto Zero

Measurement

Settle

Auto Zero

Off

Measure

Engineering Units Conversion

Math, Limits Calculation

Formatting

GPIB Data

Transmission

Data

Memory

Display

Update

Command Receive and

Interpret Speed

Function Change Speed

Range Change Speed

Measurement Speed

Change Time

Trigger Speed

COMMAND RECEIVE AND INTERPRET SPEED

Time per character

Characters per second

FASTEST

0.16 ms

6250

TYPICAL

0.28 ms

3751

SLOWEST

0.66 ms

1515

Receive and Rate

Interpret Time (per second)

TYPICAL COMMAND TIMES

Command

SENSE1:VOLTAGE:AC:

RESOLUTION MAXIMUM

VOLT:AC:RES:MAX

SENSE1:FUNC 'VOLT:AC"

RESISTANCE:RANGE:UPPER 1E9

STATUS:QUEUE:CLEAR

STAT:QUE:CLE

*TRG

9.4 ms

4.1 ms

6.3 ms

9.0 ms

5.1 ms

3.1 ms

1.2 ms

106

243

158

111

196

322

833

Settling Times

(included in reading rates)

Function Reading Rates to

Memory (see rates for each measurement function).

Autorange Speed (if on)

Engineering Units Conversion

Speed (included in reading rates for multiple measurements; add to total time for single measurements only)

Math Speed (only if Math on)

Stop here for Speed to

Memory.

Data Format Speed

Data Transfer Ratess

Display Speed

Function Reading

Rates to GPIB

(see rates for each measurement function).

MEASUREMENT SPEED CHANGE TIMES 1,2

Typical delay before first reading after making a speed change.

FUNCTION From To

AUTO ZERO OFF AUTO ZERO ON

Time Time

DCV, DCI, ACI

ACV

Ohms (2-wire)

Ohms (4-wire)

TC Temperature

Any

≤ 0.1 PLC

Any 1 PLC

Any 10 PLC

Any

≤ 0.1 PLC

Any 1 PLC

Any 10 PLC

Any

≤ 0.1 PLC

Any 1 PLC

Any 10 PLC

Any

≤ 0.1 PLC

Any 1 PLC

Any 10 PLC

Any

≤ 0.1 PLC

Any 1 PLC

Any 10 PLC

66 ms

190 ms

1540 ms

120 ms

250 ms

1600 ms

69 ms

195 ms

1540 ms

110 ms

240 ms

1590 ms

80 ms

195 ms

1545 ms

44 ms

140 ms

1195 ms

100 ms

197 ms

1250 ms

57 ms

170 ms

1370 ms

46 ms

165 ms

1370 ms

55 ms

170 ms

1370 ms

FUNCTION CHANGE SPEED 1

FROM

Function

Any

Any except ACI

ACI

Any

Function

DCV

ACV

DCI

Range(s)

200mV, 2V

20V

200V

1000V

Any

200

μA, 2mA, 20mA

200mA, 2A

Any

Any ACI

Any

Ohms (2-wire) 20

Ω, 200Ω, 2kΩ, 20kΩ

2 0 0 k

2 0 M

200M

Ω, 1GΩ

Ohms (4-wire) 20

Ω, 200Ω, 2kΩ, 20kΩ

2 0 0 k

Any except ACI and Ohms Frequency 8

ACI, Ohms (4-wire)

Ohms (2-wire)

Any

Any RTD Temp. (2-wire)

RTD Temp. (4-wire)

TC Temp.

Any

AUTO ZERO OFF

RATE

TIME (per second)

8 . 1 ms

2 4 ms

1 1 ms

5 6 3 ms

1 2 0

4 0

1 6 0

1 . 8

4 . 5 ms

6 . 0 ms

2 1 . 1 ms

5 2 1 ms

6 . 0 ms

2 6 ms

9 5 ms

2 6 5 ms

3 6 6 ms

1 2 ms

2 6 ms

6 1 ms

7 9 ms

4 1 8 ms

6 . 0 ms

1 1 . 5 ms

8 . 0 ms

2 2 0

1 6 0

4 5

1 . 9

1 6 5

3 8

1 0 . 5

1 4 0

3 8

1 6

1 2

1 6 5

1 5 0

1 2 5

3 4 ms

6 1 ms

4 2 5 ms

6 9 0 ms

5 . 5 ms

3 4 . 1 ms

6 0 ms

7 5 ms

4 1 6 ms

3 3 ms

3 7 ms

3 5 ms

AUTO ZERO ON

RATE

TIME (per second)

3 6 ms

8 . 6 ms

5 2 ms

1 0 . 2 ms

5 6 3 ms

2 7

1 1 0

1 9

1 9 0

1 . 8

5 . 1 ms

6 . 6 ms

2 2 ms

5 2 1 ms

1 9 0

1 5 0

4 5

1 . 9

2 9

1 6

2 . 4

1 . 4

1 8 0

2 9

1 6

1 7

1 3

3 0

2 7

2 8

OPERATING SPEED (cont’d)

RANGE CHANGE SPEED 1

FUNCTION

DCV

ACV

DCI

From

200mV, 2V

200V, 1000V

200mV, 2V, 20V

200V, 1000V

200mV, 2V, 20V

1000V

Any

ACI

Ohms (2-wire)

Ohms (4-wire)

Any

20V

200mV, 2V, 20V

200mV, 2V

200V

1000V

Any

200

μA, 2mA, 20mA

200mA, 2A

Any

Ω, 200Ω, 2kΩ, 20kΩ

2 0 0 k

2 0 M

200M

Ω, 1GΩ

Ω, 200Ω, 2kΩ, 20kΩ

2 0 0 k

AUTO ZERO OFF

TIME

RATE

(per second)

4.5 ms

8.0 ms

4.5 ms

8.0 ms

24 ms

9 ms

11 ms

5 6 3 ms

4 . 5 ms

6 . 0 ms

5 2 5 ms

6 . 0 ms

2 6 ms

9 5 ms

2 6 5 ms

3 6 6 ms

8 ms

2 6 ms

220

120

220

120

110

165

1 . 8

2 2 0

1 6 0

1 . 9

1 6 0

3 8

1 0

3 . 7

2 . 7

1 6 0

3 8

AUTO ZERO ON

TIME

RATE

(per second)

3.1 ms

8.6 ms

36 ms

38 ms

52 ms

37 ms

10.1 ms

5 6 3 ms

5 . 2 ms

6 . 6 ms

5 2 5 ms

3 4 ms

6 6 ms

4 2 0 ms

6 9 0 ms

5 . 5 ms

3 4 ms

6 6 ms

190

110

190

1 . 8

1 9 0

1 5 0

1 . 9

2 9

1 5

2 . 3

1 . 4

1 8 0

2 9

1 6

TRIGGER SPEED (External Trigger or Trigger-Link)

Trigger Latency:

Trigger Jitter:

Auto Zero On

1.2 ms typical

Auto Zero Off

μs

±0.5 μs

MATH AND LIMITS CALCULATION SPEED 1

CALCULATION

NOMINAL

TIME

NOMINAL

RATE (per second)

mX + b

Percent

Limits 6

None

0.35 ms

0.60 ms

0.35 ms

0.07 ms

2850

1660

2850

MAXIMUM

TIME

0.44 ms

0.64 ms

0.37 ms

0.08 ms

ENGINEERING UNIT CONVERSION SPEED

Included in reading times for multiple measurements; add to total time for single measurements only.

CONFIGURATION TIME RATE (per second)

DCV

DCV, Filter on

DCV, Relative on

DCV, Ratio on

ACV

ACV, Relative on

ACV, Filter on

ACV, dB

ACV, dBm

2.4 ms

2.5 ms

3.7 ms

5.3 ms

6.8 ms

9.4 ms

17.3 ms

416

400

270

188

147

106

DISPLAY SPEED

Display updated at up to 20 times per second. Display update can be suspended by holding the display (press ENTER) or setting Display Enable Off from GPIB.

GPIB DATA FORMATTING TRANSMISSION TIME 3

FORMAT

DREAL

(Double precision real)

SREAL

(Single precision real)

ASCII

READINGS

ONLY

Time Rdg./s

0.30 ms 3330

0.37 ms 2710

3.9 ms 255

READINGS WITH

TIME STAMP

Time Rdg./s

2.0 ms

2.1 ms

8.2 ms

500

475

120

SINGLE FUNCTION SCAN SPEED 4 (Internal Scanner)

TYPE

DCV (20V) 7

Rate

(Chan./

2-Wire Ohms

(2k

Ω)

Time Rate Time per per (Chan./

Chan.

second) Chan. second)

4-Wire Ohms

(2k

Ω)

Time Rate per (Chan./

Time per

ACV

Rate

(Chan./

Chan. second) Chan.

second)

Ratio or Delta

(2 channels) 4 ms

Fast Scan

(using solid state

channels)

Normal Scan

5.5 ms

10.3 ms

250

181

4.4 ms 230

7 ms 140

12.1 ms 80

18.5 ms

21 ms

520 ms

532 ms

1.9

1.8

Frequency

Time Rate per (Chan./

Chan.

second)

958 ms

974 ms

Temperature

Time per

Rate

(Chan./

Chan.

second)

RTD

Temperature (2-Wire)

Time per

Rate

(Chan./

Chan.

second)

13.8 ms

18 ms

55 95 ms 10

MIXED FUNCTION SCAN SPEED 1 (Internal Scanner)

SCAN CONFIGURATION

(Channels)

5 chan. DCV, 5 chan. 2w

3 DCV, 3 2w

Ω, 4 TC

5 2wRTD, 5 TC

5 2w

Ω, 5 2wRTD

9 DCV, 1 ACV

2 DCV, 1 ACV, 2 2w

Ω, 1 4wΩ

5 DCV, 5 Freq.

3 DCV, 3 ACV, 2 4w

Average Time/

Channel

20 ms

22 ms

60 ms

73 ms

122 ms

490 ms

220 ms

Average Rate

(Channel/s)

OPERATING SPEED NOTES

1. With Display off, 1 power line cycle, autorange off, filter off, triggers halted. Display on may impact time by 3% worst case. To eliminate this impact press ENTER (hold) to lock out display from front panel.

2. Based on using 20V, 2k

Ω, 200mA ranges.

3. Auto Zero off, using 386SX/16 computer, average time for 1000 readings, byte order swapped, front panel disabled.

4. Typical times for 0.01 power line cycle, autorange off, Delay=0, 100 measurements into buffer.

5. Ratio and delta functions output one value for each pair of measurements.

6. Time to measure, evaluate limits, and set digital outputs are found by summing measurement time with limits calculation time.

7. Auto Zero off.

8. Based on 100kHz input frequency.

DELAY AND TIMER

TIME STAMP

Resolution: 1

μs.

Accuracy:

±0.01% ±1μs.

Maximum: 2,100,000.000 000 seconds (24 days, 20 hours).

DELAY TIME (Trigger edge to reading initiation)

Maximum: 999,999.999 seconds (11 days, 12 hours).

Resolution: 1ms.

Jitter:

±1ms.

TIMER (Reading initiation to reading initiation)

Maximum: 999,999.999 seconds (11 days, 12 hours).

Resolution: 1ms.

Jitter:

±1ms.

NOTE: To find measurement speed, see each measurement section.

MAXIMUM INPUT LEVELS

RATED

INPUT 1

OVERLOAD

RECOVERY

TIME

HI to LO

HI Sense to LO

LO Sense to LO

I Input to LO

HI to Earth

LO to Earth

±1100V pk

± 350V pk 250V rms

2A,

± 250V

(fused)

±1600V

± 500V

< 900 ms

—

< 900 ms

1. For voltages between other terminals, these ratings can be algebraically added.

IEEE-488 BUS IMPLEMENTATION

IMPLEMENTATION: IEEE-488.2, SCPI-1991.0.

MULTILINE COMMANDS: DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE, SPD.

UNILINE COMMANDS: IFC, REN, EOI, SRQ, ATN.

INTERFACE COMMANDS: SH1, AH1, T5, TE0, L4, LE0, SR1, RL1, PP0, DC1,

DT1, C0, E1.

DIGITAL I/O

CONNECTOR TYPE: 8 pin “D” subminiature.

INPUT: One pin, TTL compatible.

OUTPUTS: Four pins. Open collector, 30V maximum pull-up voltage, 100mA maximum sink current, 10

Ω output impedance.

CONTROL: Direct control by output or set real-time with limits.

GENERAL SPECIFICATIONS AND STANDARDS COMPLIANCE

POWER

Voltage: 90–134V and 180–250V, universal self-selecting.

Frequency: 50Hz, 60Hz, or 400Hz self-identifying.

Consumption: <55VA.

ENVIRONMENTAL

Operating Temperature: 0

°C to 50 °C.

Storage Temperature: –40

°C to 70 °C.

Humidity: 80% R.H., 0

°C to 35°C, per MIL-T-28800E

1 Para 4.5.5.1.2.

NORMAL CALIBRATION

Type: Software. No manual adjustments required.

Sources: 2 DC voltages (2V, 20V) and 2 resistances (19k and 1M). Different calibration source values are allowed. All other functions calibrated (adjusted) from these sources and a short circuit. No AC calibrator required for adjustment.

PHYSICAL

Case Dimensions: 90mm high

× 214mm wide × 369mm deep (3

14 1 ⁄

in.).

⁄

in.

× 8

1 ⁄

in.

Working Dimensions: From front of case to rear including power cord and

IEEE-488 connector: 15.0 inches.

Net Weight: <4.2kg (<9.2 lbs.).

Shipping Weight: <9.1kg (<20lbs.).

STANDARDS

EMI/RFI: Conforms to VDE 0871B (per Vfg 1046/1984), IEC 801-2. Meets FCC part 15 Class B, CISPR-22 (EN55022).

Safety: Conforms to IEC348, CAN/CSA-C22.2. No. 231, MIL-T-28800E 1 .

Designed to UL1244.

Reliability: MIL-T-28800E 1 .

Maintainability: MIL-T-28800E 1 .

MTTR: <90 minutes (includes disassembly and assembly, excludes recalibration). MTTR is Mean Time To Repair.

MTBF, Estimated: >75,000 hours (Bellcore method). MTBF is Mean Time

Between Failure.

MTTC: <20 minutes for normal calibration. <6 minutes for AC self-calibration.

MTTC is Mean Time To Calibrate.

Process: MIL-STD 45662A and BS5750.

ACCESSORIES SUPPLIED

The unit is shipped with line cord, high performance modular test leads, user’s manual, option slot cover, and full calibration data. A personal computer startup package is available free.

Note 1: For MIL-T-28800E, applies to Type III, Class 5, Style E.

EXTENDED MEMORY / NON-VOLATILE MEMORY OPTIONS

MODEL

2001

2001/MEM1

2001/MEM2

SIZE

(Bytes)

32k

128k

4 1 ⁄

-Digit

850

7,000

30,000

DATA STORAGE

6 1 ⁄

-Digit w/Time Stamp

250

1,400

6,000

Type

volatile non-volatile non-volatile

SETUP STORAGE

Number Type

10 non-volatile non-volatile non-volatile

Specifications subject to change without notice.

Calibration Programs

Introduction

This appendix includes programs written in QuickBASIC and Turbo C to aid you in calibrating the Model 2001. Programs include:

• Comprehensive calibration programs for use with any suitable calibrator.

• Comprehensive calibration programs for use with the

Fluke 5700A Calibrator.

• Low-level calibration programs for use with the Fluke

5700A Calibrator.

Refer to Section 2 for more details on calibration procedures.

QuickBASIC program requirements

In order to use the QuickBASIC programs, you will need the following:

• IBM PC, AT, or compatible computer.

• IOtech Personal488, CEC PC-488, or National Instruments PC-II or IIA IEEE-488 interface for the computer.

• Shielded IEEE-488 cable(s) (Keithley Model 7007).

• MS-DOS or PC-DOS version 3.3 or later.

• Microsoft QuickBASIC version 4.0 or later.

• IOtech Driver488 IEEE-488 bus driver, Rev. 2.3 or later. (NOTE: recent versions of Driver488 may not support other manufacturers’ interface cards).

Turbo C program requirements

In order to use the Turbo C programs, you will need the following:

• IBM PC, AT, or compatible computer.

• IOtech Personal488, CEC PC-488, or National Instruments PC-II or IIA IEEE-488 interface for the computer.

• Shielded IEEE-488 cable(s) (Keithley Model 7007).

• MS-DOS or PC-DOS version 3.3 or later.

• Borland Turbo C version 2.0 or later.

• IOtech Driver488 IEEE-488 bus driver, Rev. 2.3 or later. (NOTE: recent versions of Driver488 may not support other manufacturers’ interface cards).

Calibration equipment

Table B-1 summarizes recommended comprehensive calibration equipment, and Table B-1 summarizes test equipment required for low-level calibration.

B-1

Calibration Programs

Table B-1

Recommended equipment for comprehensive calibration

Mfg.

Model Description Specifications*

Fluke 5700A Calibrator ±5ppm basic uncertainty.

DC voltage:

2V: ±5ppm

20V: ±5ppm

Resistance:

19k¾: ±11ppm

1M¾: ±18ppm

Keithley 8610 Low-thermal Shorting Plug

* 90-day calibrator specifications shown include total uncertainty at specified output. The 2V output includes 0.5ppm transfer uncertainty.

Table B-1

Recommended equipment for low-level calibration

Mfg.

Model Description Specifications*

Fluke 5700A Calibrator ±5ppm basic uncertainty.

DC voltage:

0V: ±0.75μV

-2V, +2V: ±5ppm

20V: ±5ppm

DC current:

200mA: ±65ppm

2A: ±90ppm

AC voltage:

0.5mV @ 1kHz: ±10000ppm

5mV @ 100kHz: ±2400ppm

200mV @ 1kHz: ±150ppm

1.5V @ 1kHz: ±80ppm

20V @ 1kHz: ±80ppm

20V @ 30kHz: ±140ppm

200V @ 1kHz: ±85ppm

200V @ 30kHz: ±240ppm

AC current:

20mA @ 1kHz: ±160ppm

Resistance:

19k¾: ±11ppm

1M¾: ±18ppm

2V rms @ 1Hz Keithley

Keithley

3930A

8610

Synthesizer

Low-thermal Shorting Plug

* 90-day calibrator specifications shown include total uncertainty at specified output. The ±2V output includes 0.5ppm transfer uncertainty.

B-2

Calibration Programs

General program instructions

1. With the power off, connect the Model 2001 to the

IEEE-488 interface of the computer. If you are using one of the programs that controls the Fluke 5700A calibrator, connect the calibrator to the IEEE-488 bus as well.

Be sure to use shielded IEEE-488 cables for bus connections.

2. Turn on the computer, the Model 2001, and the calibrator. Allow the Model 2001 to warm up for at least one hour before performing calibration.

3. Make sure the Model 2001 is set for a primary address of 16. You can check or change the address as follows:

A. Press MENU, select GPIB, then press ENTER.

B. Select MODE, then press ENTER.

C. Select ADDRESSABLE, and press ENTER.

D. If the address is set correctly, press EXIT as necessary to return to normal display.

E. To change the address, use the cursor keys to set the address to the desired value, then press ENTER.

Press EXIT as necessary to return to normal display.

4. If you are using the Fluke 5700A calibrator over the bus

(Program B-3 through Program B-6), make sure that the calibrator primary address is at its factory default setting of 4.

5. Make sure that the computer bus driver software is properly initialized.

6. Enter the QuickBASIC or Turbo C editor, and type in the desired program. Check thoroughly for errors, then save it using a convenient filename.

7. Compile and run the program, and follow the prompts on the screen to perform calibration.

Comprehensive calibration

Programs B-1 and B-2 will perform semi-automatic comprehensive calibration of the Model 2001 using any suitable calibrator (see Table B-1 for required calibrator specifications).

Programs B-3 and B-4 will perform comprehensive calibration almost fully automatically using the Fluke 5700A calibrator.

Figure B-1 shows low-thermal short connections, while Figure B-2 shows calibrator connections.

Low-level calibration

Programs B-5 and B-6 perform low-level calibration using the Fluke 5700A calibrator. Refer to Figure B-1 and B-3 for low-thermal short and calibrator voltage connections. Figure

B-4 shows calibrator current connections. Figure B-5 shows synthesizer connections necessary to supply the 2V AC @

1Hz signal.

NOTE

Low-level calibration is not normally required in the field unless the Model 2001 has been repaired.

Unlocking calibration

In order to unlock comprehensive calibration, briefly press in on the CAL switch with the power turned on. To unlock lowlevel calibration, press in and hold the CAL switch while turning on the power.

Model 2001

S+

SENSE

Ω 4 WIRE

INPUT

PREV

DISPLAY

NEXT

POWER

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Model 8610

Low-thermal short

SLO

Figure B-1

Low-thermal short connections

B-3

Calibration Programs

Sense HI

Model 2001

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

PREV

DISPLAY

NEXT

POWER

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Input

Sense LO

Sense HI

Output HI

Output

Note : Use shielded cables to minimize noise.

Enable or disable calibrator external

sense as indicated in procedure. Use

internal Guard (EX GRD LED is off).

Figure B-2

Calibration connection for comprehensive calibration

Sense LO

5700A Calibrator

Ground link installed.

5700A Calibrator

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL

CHAN SCAN

FILTER MATH

CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

Input HI

Output HI

Input

Output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

Figure B-3

Calibration voltage connections

B-4

Calibration Programs

5700A Calibrator

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG

INFO LOCAL

STORE RECALL FILTER MATH

CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

2A 250V

AMPS

500V

PEAK

CAL

Input

Output HI

Amps

Output

Ground link installed.

Note: Use internal Guard (EX GRD LED is off).

Figure B-4

Calibration current connections

Model 2001

PREV

DISPLAY

NEXT

POWER

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1100V

PEAK

2001 MULTIMETER

DCV ACV DCI ACI

Ω2 Ω4

REL TRIG STORE RECALL FILTER MATH

INFO LOCAL CHAN SCAN CONFIG MENU

FREQ TEMP

EXIT ENTER

RANGE

AUTO

RANGE

INPUTS

FRONT/REAR

CAL

2A 250V

AMPS

500V

PEAK

BNC-to-Dual

Banana Plug

Adapter

Model 3930A Synthesizer

3930A MULTIFUNCTION SYNTHESIZER

Ω BNC Coaxial Cable

Figure B-5

Synthesizer connections

Function

Output

B-5

Calibration Programs

Program B-1

Comprehensive calibration program for use with any suitable calibrator (QuickBASIC Version).

B-6

Program B-1 (continued)

Comprehensive calibration program for use with any suitable calibrator (QuickBASIC Version).

Calibration Programs

B-7

Calibration Programs

Program B-2

Comprehensive calibration program for use with any suitable calibrator (Turbo C Version).

B-8

Program B-2 (continued)

Comprehensive calibration program for use with any suitable calibrator (Turbo C Version).

Calibration Programs

B-9

Calibration Programs

Program B-2 (continued)

Comprehensive calibration program for use with any suitable calibrator (Turbo C Version).

B-10

Program B-3

Comprehensive calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

Calibration Programs

B-11

Calibration Programs

Program B-3 (continued)

Comprehensive calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

B-12

Program B-3 (continued)

Comprehensive calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

Calibration Programs

B-13

Calibration Programs

Program B-4

Comprehensive calibration program for use with Fluke 5700A calibrator (Turbo C Version).

B-14

Program B-4 (continued)

Comprehensive calibration program for use with Fluke 5700A calibrator (Turbo C Version).

Calibration Programs

B-15

Calibration Programs

Program B-4 (continued)

Comprehensive calibration program for use with Fluke 5700A calibrator (Turbo C Version).

B-16

Program B-5

Low-level calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

Calibration Programs

B-17

Calibration Programs

Program B-5 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

B-18

Program B-5 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

Calibration Programs

B-19

Calibration Programs

Program B-5 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (QuickBASIC Version).

B-20

Program B-6

Low-level calibration program for use with Fluke 5700A calibrator (Turbo C Version).

Calibration Programs

B-21

Calibration Programs

Program B-6 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (Turbo C Version).

B-22

Program B-6 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (Turbo C Version).

Calibration Programs

B-23

Calibration Programs

Program B-6 (continued)

Low-level calibration program for use with Fluke 5700A calibrator (Turbo C Version).

B-24

Calibration Messages

Introduction

This appendix lists all calibration errors that may occur during calibration as well as the :CAL:PROT:DATA? response.

Calibration data query response

Table C-2 lists the response to the :CAL:PROT:DATA? query. The response is an ASCII string of 99 numbers separated by commas, and is not affected by the FORMAT command. Constants listed in Table C-2 are shown in the order they are sent.

Error summary

Table C-1 summarizes Model 2001 calibration errors. The error string returned over the bus by the :SYST:ERR? query include the error ID code and message separated by a comma and the message surrounded by quotes. For example:

+438, “Date of calibration not set”

C-1

Calibration Messages

Table C-1

Calibration errors

Error ID code

+369

+370

+371

+372

+373

+374

+375

+376

+361

+362

+363

+364

+365

+366

+367

+368

-102

-113

-200

-221

-222

+353

+354

+355

+356

+357

+358

+359

+360

+384

+385

+386

+387

+388

+389

+390

+391

+392

+393

+377

+378

+379

+380

+381

+382

+383

Error messages

No Error

Syntax error

Command header error

Execution error

Settings conflict

Parameter data out of range

200 mV gain out of spec

200 mV offset out of spec

2V gain out of spec

2 V offset out of spec

20 V gain out of spec

20 V offset out of spec

200 V gain out of spec

200 V offset out of spec

1000 V gain out of spec

1000 V offset out of spec

200 μA gain out of spec

200 μA offset out of spec

2 mA gain out of spec

2 mA offset out of spec

20 mA gain out of spec

20 mA offset out of spec

200 mA gain out of spec

200 mA offset out of spec

2 A gain out of spec

2 A offset out of spec

20 ohm 2w gain out of spec

20 ohm 2w offset out of spec

200 ohm 2w gain out of spec

200 ohm 2w offset out of spec

2 kohm 2w gain out of spec

2 kohm 2w offset out of spec

20 kohm 2w gain out of spec

20 kohm 2w offset out of spec

200 kohm 2w gain out of spec

200 kohm 2w offset out of spec

2 Mohm 2w gain out of spec

2 Mohm 2w offset out of spec

20 Mohm 2w gain out of spec

20 Mohm 2w offset out of spec

200 Mohm 2w gain out of spec

200 Mohm 2w offset out of spec

1 Gohm 2w gain out of spec

1 Gohm 2w offset out of spec

20 ohm 4w gain out of spec

20 ohm 4w offset out of spec

200 ohm 4w gain out of spec

Table C-1 (continued)

Calibration errors

Error ID code

+416

+417

+418

+419

+420

+421

+422

+423

+408

+409

+410

+411

+412

+413

+414

+415

+394

+395

+396

+397

+398

+399

+400

+401

+402

+403

+404

+405

+406

+407

+431

+432

+433

+434

+435

+436

+437

+438

+439

+440

+424

+425

+426

+427

+428

+429

+430

Error messages

200 ohm 4w offset out of spec

2 kohm 4w gain out of spec

2 kohm 4w offset out of spec

20 kohm 4w gain out of spec

20 kohm 4w offset out of spec

200 kohm 4w gain out of spec

200 kohm 4w offset out of spec

2 Mohm 4w gain out of spec

2 Mohm 4w offset out of spec

7 V ref out of spec

DCV rollover out of spec x1 rms gain out of spec x1 rms offset out of spec x10 rms gain out of spec x10 rms offset out of spec x1 fwr gain out of spec x1 fwr offset out of spec x10 fwr gain out of spec x10 fwr offset out of spec d100 atten out of spec d500 atten out of spec

Pos x10 peak offset out of spec

Neg x10 peak offset out of spec x1 peak offset out of spec

Pos 20V peak offset out of spec

Neg 20V peak offset out of spec d100 self cal DAC out of spec d500 self cal DAC out of spec x10 noise factor out of spec x1 cfc out of spec x10 cfc out of spec

Low V coupling fact out of spec

High V coupling fact out of spec

Input time constant out of spec

Curr coupling fact out of spec

Comparator DAC out of spec d100 div DAC out of spec

200 V div DAC out of spec d500 div DAC out of spec d100 div DAC offset out of spec

200 V div DAC offset out of spec d500 div DAC offset out of spec d100 div cal did not converge d500 div cal did not converge

Date of calibration not set

Next date of calibration not set

Calibration process not completed

C-2

Calibration Messages

Table C-2

Calibration constants returned by :CAL:PROT:DATA? Query

Constant

ofpkneg20 div100self div500self noise10 cfc1 cfc10 acdclow acdchigh inputtc acdccur compval1 div100 div200 div500 div100off div200off g1 of1 g10 of10 gfwr1 offwr1 gfwr10 offwr10 a100 a500 ofpkpos10 ofpkneg10 ofpk1 ofpkpos20 div500off dcv[200mV]gain dcv[200mV]offset dcv[2V]gain dcv[2V]offset dcv[20V]gain dcv[20V]offset dcv[200V]gain dcv[200V]offset dcv[1000V]gain dcv[1000V]offset dca[200uA]gain dca[200uA]offset dca[2mA]gain dca[2mA]offset dca[20mA]gain dca[20mA]offset dca[200mA]gain dca[200mA]offset dca[2A]gain dca[2A]offset

Description

RMS gain for 2V, 200V, and 750V AC ranges

RMS offset for 2V, 200V, and 750V AC ranges

RMS gain for 200mV and 20V AC ranges

RMS offset for 200mV and 20V AC ranges

Average gain for 2V, 200V, and 750V AC ranges

Average offset for 2V, 200V, and 750V AC ranges

Average gain for 200mV and 20V AC ranges

Average offset for 200mV and 20V AC ranges

100:1 divider attenuation factor

500:1 divider attenuation factor

Positive peak offset for 200mV AC range

Negative peak offset for 200mV AC range

Positive and negative peak offset for 2V, 200V, and 750V AC ranges

Positive peak offset for 20V AC range

Negative peak offset for 20V AC range

Self-calibration code for frequency compensation DAC, 100:1 divider

Self-calibration code for frequency compensation DAC, 500:1 divider

Noise factor for 200mV and 20V AC ranges

Crest factor correction factor for 2V, 200V, and 750V AC ranges

Crest factor correction factor for 200mV and 20V AC ranges

AC-coupled correction factor for 200mV and 2V AC ranges

AC-coupled correction factor for 20V, 200V, and 750V AC ranges

Input time constant

AC-coupled correction factor for AC current

RMS comparator DAC code

Frequency-compensation DAC code for 20V AC range

Frequency-compensation DAC code for 200V AC range

Frequency-compensation DAC code for 750V AC range

Frequency-compensation DAC offset for 20V AC range

Frequency compensation DAC offset for 200V AC range

Frequency compensation DAC offset for 750V AC range

200mV DC gain

200mV DC offset

2V DC gain

2V DC offset

20V DC gain

20V DC offset

200V DC gain

200V DC offset

100V DC gain

1000V DC offset

200μA DC gain

200μA DC offet

2mA DC gain

2mA DC offset

20mA DC gain

20mA DC offset

200mA DC gain

200mA DC offset

2A DC gain

2A DC offset

C-3

Calibration Messages

Table C-2 (continued)

Calibration constants returned by :CAL:PROT:DATA? Query

Constant

mux4d711 mux4d711p5 mux4d215 mux4d011 mux4d015 mux4d0150 mux4d011p5 mux4dF150 mux4dF15 i20 i200 i2k i20k i200k i2m i20m i200m i1g ohm2[20]gain ohm2[20]offset ohm2[200]gain ohm2[200]offset ohm2[2k]gain ohm2[2k]offset ohm2[20k]gain ohm2[20k]offset ohm2[200k]gain ohm2[200k]offset ohm2[2M]gain ohm2[2M]offset ohm2[20M]gain ohm2[20M]offset ohm2[200M]gain ohm2[200M]offset ohm2[1G]gain ohm2[1G]offset ohm4[20]gain ohm4[20]offset ohm4[200]gain ohm4[200]offset ohm4[2k]gain ohm4[2k]offset ohm4[20k]gain ohm4[20k]offset ohm4[200k]gain ohm4[200k]offset n7vref rollover

Description

2-wire 20¾ gain

2-wire 20¾ offset

2-wire 200¾ gain

2-wire 200¾ offset

2-wire 2k¾ gain

2-wire 2k¾ offset

2-wire 20k¾ gain

2-wire 20k¾ offset

2-wire 200k¾ gain

2-wire 200k¾ offset

2-wire 2M¾ gain

2-wire 2M¾ offset

2-wire 20M¾ gain

2-wire 20M¾ offset

2-wire 200M¾ gain

2-wire 200M¾ offset

2-wire 1G¾ gain

2-wire 1G¾ offset

4-wire 20¾ gain

4-wire 20¾ offset

4-wire 200¾ gain

4-wire 200¾ offset

4-wire 2k¾ gain

4-wire 2k¾ offset

4-wire 20k¾ gain

4-wire 20k¾ offset

4-wire 200k¾ gain

4-wire 200k¾ offset

7V reference value

±2V rollover

Multiplexer 4-1/2 digit counts (AC peak)

20¾ range current source value

200¾ range current source value

2k¾ range current source value

20k¾ range current source value

200k¾ range current source value

2M¾ range current source value

20M¾ range current source value

200M¾ range current source value

1G¾ range current source value

NOTE: All values are expressed in NR3 format (floating point with exponent). Constants are listed in order transmitted and are separated by commas.

C-4

Alternate Calibration Sources

Introduction

As stated in Sections 1 and 2, the Fluke 5700A Calibrator is the calibration source recommended for both performance verification and calibration. Table D-1 summarizes alternate calibration equipment that may be substituted for the recom-

Table D-1

Alternate calibration sources

mended Model 5700A. Note, however, that the alternate equipment may not be as precise for certain calibration values. Refer to the manufacturers’ specifications for more detailed information.

Manufacturer and Model

Fluke 5440B Direct Voltage Calibrator

Fluke 5450B Resistance Calibration

Fluke 5200A Precision Alternating Voltage Calibrator

Datron 4808 Multifunction Calibrator

(Options 10, 20, 30, 40, 50)

Function(s)

DCV

Ohms

ACV

Comparison to

5700A uncertainty

Equivalent

Less precise

DCV, ACV, DCI, ACI,

Ohms

Similar

D-1

Specifications are subject to change without notice.

All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.

All other trademarks and trade names are the property of their respective companies.

A G R E A T E R M E A S U R E O F C O N F I D E N C E

Keithley Instruments, Inc.

Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY • www.keithley.com

12/06

Key features

DC voltage measurement
AC voltage measurement
DC current measurement
AC current measurement
Resistance measurement
Frequency measurement
Temperature measurement

Frequently asked questions

Press MENU, then select SAVESETUP and press ENTER. Select RESET, then press ENTER. Select BENCH, then press ENTER. Press ENTER again to confirm instrument reset.

Fluke 5700A Calibrator, Fluke 5725A Amplifier, Fluke 5700A-03 Wideband AC option, Fluke 5440A-7002 Low thermal cable set, Keithley CA-18-1 Low capacitance cable, Keithley R-289-1G 1GΩ resistor, Metal component box, Insulated banana plugs (2).

Apply accurate DC voltages from a calibrator to the Model 2001 input and verify that the displayed readings fall within specified ranges.

Apply accurate AC voltages at specific frequencies from an AC calibration source and then verify that each Model 2001 AC voltage reading falls within the specified range.

Apply accurate DC currents from a calibrator to the instrument AMPS input and then verify that the current readings fall within appropriate limits.

Model 2001 Multimeter

Calibration Manual

2001-M-905-01 Rev. H / Mar 2011

Model 2001 Multimeter

Calibration Manual

© 1992-2011, Keithley Instruments, Inc.

Cleveland, Ohio, U.S.A.

All rights reserved.

Reproduction and distribution of this technical manual is authorized for government purposes.

Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written approval of Keithley Instruments, Inc. is strictly prohibited.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley

Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.

The Lua 5.0 software and associated documentation files are copyright © 1994-2008, Tecgraf,

PUC-Rio. Terms of license for the Lua software and associated documentation can be accessed at the Lua licensing site (http://www.lua.org/license.html).

Document number: 2001-M-905-01 Rev. H / March 2011

Table of Contents

1

2

Performance Verification

Calibration

3

Calibration Command Reference

Appendices

Performance Verification

1.1

Introduction

Extended Warranty

1.2

Environmental conditions

1.3

Warm-up period

1.4

Line power

1.5

Recommended test equipment

1.6

Verification limits

1.7

Restoring default conditions

MAIN MENU

SETUP MENU

RESET ORIGINAL DFLTS

RESETTING INSTRUMENT

1.8

Verification procedures

Normal mode

Low-frequency mode

Model 2001

AC peak mode

Model 2001

Model 2001

20¾ - 200k¾ range verification

2M¾ – 200M¾ range verification

1G¾ range verification

Model 2001

Selecting the temperature sensor

Thermocouple temperature reading checks

RTD Temperature reading checks

Calibration

2.1

Introduction

2.2

Environmental conditions

2.3

Warm-up period

2.4

Line power

2.5

Calibration lock

CALIBRATION UNLOCKED

CALIBRATION LOCKED

CAL ALREADY UNLOCKED

:CAL:PROT:SWIT?

:CAL:PROT:LLEV:SWIT?

2.6

IEEE-488 bus calibration commands and program

Comprehensive calibration

Low-level calibration

Program requirements

Program instructions