Tektronix DMM6500 User manual
Model DMM6500
6½-Digit Multimeter with Scanning
Calibration and Adjustment Manual
DMM6500-905-01 Rev. E June 2022
tek.com/keithley
*DMM6500-905-01E*
DMM6500-905-01E
6½-Digit Multimeter with Scanning
DMM6500
Calibration and Adjustment Manual
© 2022, Keithley Instruments, LLC
Cleveland, Ohio, U.S.A.
All rights reserved.
Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,
without the prior written approval of Keithley Instruments, LLC, is strictly prohibited.
These are the original instructions in English.
TSPTM and TSP-LinkTM are trademarks of Keithley Instruments, LLC. All Keithley Instruments
product names are trademarks or registered trademarks of Keithley Instruments, LLC. 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
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Microsoft, Visual C++, Excel, and Windows are either registered trademarks or trademarks of
Microsoft Corporation in the United States and/or other countries.
Document number: DMM6500-905-01 Rev. E June 2022
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 nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by 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 products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low
transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient
overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
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
30 V RMS, 42.4 V peak, or 60 VDC 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 1000 V, 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.
For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
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 protective earth (safety 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.
screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
If a
The
symbol on an instrument means caution, risk of hazard. The user must 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 warning, risk of electric shock. Use standard safety precautions to avoid personal
contact with these voltages.
The
The
If this
symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
symbol indicates a connection terminal to the equipment frame.
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 hazards 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.
The CAUTION heading with the
symbol in the user documentation explains hazards that could result in moderate or minor
injury or damage the instrument. Always read the associated information very carefully before performing the indicated
procedure. Damage to the instrument 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. Standard fuses with applicable national safety
approvals may be used if the rating and type are the same. The detachable mains power cord provided with the instrument may
only be replaced with a similarly rated power cord. 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 to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement
component, call a Keithley office for information.
Unless otherwise noted in product-specific literature, Keithley instruments are designed to operate indoors only, in the following
environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution degree 1 or 2.
To clean an instrument, use a cloth dampened with deionized water 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.
Safety precaution revision as of June 2018.
Table of contents
Introduction ............................................................................................................... 1-1
Welcome .............................................................................................................................. 1-1
Introduction to this manual ................................................................................................... 1-1
Extended warranty ............................................................................................................... 1-2
Contact information .............................................................................................................. 1-2
Performance verification .......................................................................................... 2-1
Introduction .......................................................................................................................... 2-1
Verification test requirements .............................................................................................. 2-2
Environmental conditions .......................................................................................................... 2-2
Warmup period .......................................................................................................................... 2-2
Line power................................................................................................................................. 2-3
Recommended test equipment ................................................................................................. 2-3
Calibration verification limits ................................................................................................ 2-4
Example reading limit calculation .............................................................................................. 2-4
Calculating resistance reading limits ......................................................................................... 2-4
Performing the verification test procedures ......................................................................... 2-5
Test summary ........................................................................................................................... 2-5
Test considerations ................................................................................................................... 2-6
Front-panel calibration verification ....................................................................................... 2-6
DC voltage verification .............................................................................................................. 2-6
AC voltage verification ............................................................................................................ 2-10
Digitize dc voltage verification ................................................................................................. 2-14
Frequency verification ............................................................................................................. 2-17
Simulated thermocouple type J temperature verification ......................................................... 2-18
Simulated RTD temperature verification ................................................................................. 2-20
Resistance verification ............................................................................................................ 2-24
DC current verification ............................................................................................................. 2-29
Digitize current verification ...................................................................................................... 2-33
AC current verification ............................................................................................................. 2-36
Capacitance verification .......................................................................................................... 2-39
Verifying zero values using a 4-wire short ............................................................................... 2-41
Rear-panel verification ....................................................................................................... 2-43
DC current 10 A range verification .......................................................................................... 2-43
Digitize current 10 A range verification .................................................................................... 2-45
AC current 10 A verification..................................................................................................... 2-47
Adjustment ................................................................................................................ 3-1
Introduction .......................................................................................................................... 3-1
Environmental conditions ..................................................................................................... 3-2
Temperature and relative humidity ............................................................................................ 3-2
Line power................................................................................................................................. 3-2
Warmup period ..................................................................................................................... 3-2
Adjustment overview ............................................................................................................ 3-3
Recommended test equipment ............................................................................................ 3-3
Table of contents
Calibration and Adjustment Manual
DMM6500 6½-Digit Multimeter with Scanning
General adjustment considerations ..................................................................................... 3-4
Initial instrument setup ......................................................................................................... 3-5
Select the correct terminals ....................................................................................................... 3-5
Select the TSP command set .................................................................................................... 3-5
Verify instrument date and time ................................................................................................. 3-6
Set up remote connections........................................................................................................ 3-6
Unlock calibration ...................................................................................................................... 3-6
Disable temperature correction ................................................................................................. 3-7
Remote calibration adjustment procedures ......................................................................... 3-7
Disable temperature correction ................................................................................................. 3-7
Front-terminal adjustment with a 4-wire short ........................................................................... 3-7
Rear-terminal adjustment with a 4-wire short .......................................................................... 3-10
Front-terminal adjustment with open circuit inputs .................................................................. 3-13
Rear-terminal adjustment with open circuit inputs ................................................................... 3-14
Resistance adjustment ............................................................................................................ 3-15
DC voltage adjustment ............................................................................................................ 3-18
DC current adjustment ............................................................................................................ 3-20
DC current 10 A range adjustment .......................................................................................... 3-24
AC voltage adjustment ............................................................................................................ 3-26
AC current adjustment ............................................................................................................ 3-29
AC current 10 A range adjustment .......................................................................................... 3-31
Frequency adjustment ............................................................................................................. 3-32
Complete list of calibration commands .................................................................................... 3-34
Enable temperature correction ........................................................................................... 3-46
Save calibration and set the adjustment dates .................................................................. 3-46
Setting time, adjustment, and verification dates ................................................................ 3-47
Adjustment command timing and error checking ............................................................... 3-47
Handling events ................................................................................................................. 3-48
TSP command reference .......................................................................................... 4-1
TSP commands .................................................................................................................... 4-1
Introduction ............................................................................................................................... 4-1
cal.adjust.count ......................................................................................................................... 4-2
cal.adjust.date ........................................................................................................................... 4-3
cal.adjust.step.setup() ............................................................................................................... 4-4
cal.adjust.step.execute() ........................................................................................................... 4-5
cal.lock() .................................................................................................................................... 4-6
cal.password ............................................................................................................................. 4-7
cal.save()................................................................................................................................... 4-8
cal.unlock() ................................................................................................................................ 4-9
cal.verify.date .......................................................................................................................... 4-10
In this section:
Contact information .................................................................. 1-2
Welcome
The DMM6500 is a 6½ digit graphical sampling multimeter that expands standard DMM functions with
high-speed digitizing and large graphical color touchscreen display.
This manual provides information on completing verification and adjustment procedures for your
DMM6500.
Section 1
Introduction
Welcome .................................................................................. 1-1
Introduction to this manual ....................................................... 1-1
Extended warranty ................................................................... 1-2
Introduction to this manual
This manual provides instructions to help you calibrate and adjust your DMM6500. In this manual,
calibration refers to the process of verifying that the accuracy of the instrument is within its one-year
accuracy specifications. Also, adjustment refers to the process of changing the calibration constants
so that the accuracy of the instrument is within its one-year accuracy specifications.
This manual presents calibration information, adjustment information, and command descriptions for
the calibration and adjustment commands.
For additional command descriptions, refer to the DMM6500 Reference Manual available on the
Product Support and Downloads web page (tek.com/en/support/product-support). Additionally,
refer to the release notes for your instrument that contains relevant information on
improvements, changes, and known issues.
Section
ation and Adjustment Manual
1: Introduction DMM6500 6½-Digit Multimeter with Scanning Calibr
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 office, sales partner, or distributor for details.
Contact information
If you have any questions after you review the information in this documentation, please contact your
local Keithley Instruments office, sales partner, or distributor. You can also call the Tektronix
corporate headquarters (toll-free inside the U.S. and Canada only) at 1-800-833-9200. For worldwide
contact numbers, visit tek.com/contact
.
1-2 DMM6500-905-01 Rev. E June 2022
Rear-panel verification ........................................................... 2-43
In this section:
Introduction .............................................................................. 2-1
Verification test requirements ................................................... 2-2
Calibration verification limits ..................................................... 2-4
Performing the verification test procedures .............................. 2-5
Front-panel calibration verification ........................................... 2-6
Introduction
Use the procedures in this section to verify that DMM6500 accuracy is within the limits stated in the
instrument’s one-year accuracy specifications. Specifications and characteristics are subject to
change without notice; refer to the Product Support and Downloads web page
(tek.com/en/support/product-support) for the most recent specifications.
Section 2
Performance verification
You can use these verification procedures to:
• Make sure that the instrument was not damaged during shipment.
• Verify that the instrument meets factory specifications.
• Determine if adjustment is required.
• Verify that adjustment was done properly.
The information in this section is intended for qualified service personnel only, as described
by the types of product users in the Safety precautions pages, provided at the beginning of
this document. Do not attempt these procedures unless you are qualified to do so.
Some of these procedures may expose you to hazardous voltages, that if contacted, could
cause personal injury or death. Use appropriate safety precautions when working with
hazardous voltages.
Section
Calibration and Adjustment Manual
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
If the instrument is still under warranty and its performance is outside specified limits, please contact
your local Keithley Instruments office, sales partner, or distributor. You can also call the Tektronix
corporate headquarters (toll-free inside the U.S. and Canada only) at 1-800-833-9200. For worldwide
contact numbers, visit tek.com/contact
.
Verification test requirements
Be sure that you perform these verification tests:
• Under the proper environmental conditions.
• After the specified warmup period.
• Using the correct line voltage.
• Using the proper test equipment.
• Using the specified output signal and reading limits.
Environmental conditions
Conduct the calibration verification procedures in a test environment with:
• An ambient temperature of 18 °C to 28 °C.
• A relative humidity of less than or equal to 80 percent, unless otherwise noted.
• No direct airflow on the input terminals.
Warmup period
Allow the DMM6500 to warm up for at least 30 minutes before conducting the calibration verification
procedures.
If the instrument has been subjected to temperature extremes (more than 5 °C above or below T
allow additional time for the internal temperature of the instrument to stabilize. Typically, allow an
additional 30 minutes to stabilize an instrument that is 10 °C outside the specified temperature range.
Also allow the test equipment to warm up for the time recommended by the manufacturer.
CAL
),
2-2 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
Fluke
5720A or 5730A
High-Performance
DCV, ACV, ACI, and
See following
Fluke
5725A
Amplifier
DCI and ACI
See following
note.
Fluke
8508A or 8588A
8.5-Digit Reference
Multimeter
DCI
See following
note.
Keithley
Instruments
3390
Function/Arbitrary
Waveform Generator
Frequency
See following
note.
IET Labs, Inc.
HACS-Z-A-2E-1uF
Series HACS-Z High
Capacitance Box
Capacitance, 1 µF to
See following
Keithley
Instruments
8610 or 8620
4-Wire DMM Shorting
Plug
DCV, digitize DCV, and
resistance
See following
note.
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
Line power
The DMM6500 requires a line voltage of 100 V to 240 V and a line frequency of 400 Hz, 50 Hz or
60 Hz. Calibration verification tests should be performed within this range.
The instrument automatically senses the line frequency at power-up.
Recommended test equipment
The following table summarizes the recommended calibration verification equipment. You can use
alternate equipment if that equipment has specifications that meet or exceed those listed in the table
below. Test equipment uncertainty adds to the uncertainty of each measurement. Generally, test
equipment uncertainty should be at least four times more accurate than corresponding DMM6500
specifications.
In this manual, the Model 8610 shorting plug is shown in the figures. However, you can use either
the Model 8610 or the Model 8620 shorting plug.
Manufacturer Model Description Used for Uncertainty
Multifunction Calibrator
IET Labs, Inc. 1423-A Precision Decade
Capacitor
Accuracy Decade
resistance
Capacitance, 1 nF to
1 µF
100 µF
note.
See following
note.
note.
Refer to the manufacturer's specifications to calculate the uncertainty, which varies for each function
and range test point.
DMM6500-905-01 Rev. E June 2022 2-3
Section
Calibration and Adjustment Manual
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
Calibration verification limits
The calibration verification limits stated in this section have been calculated using only the DMM6500
one-year accuracy specifications and ambient temperature ±5 °C from T
the instrument was calibrated). They do not include test equipment uncertainty. If a particular
measurement falls outside the allowable range, recalculate new limits based on both the DMM6500
specifications and corresponding test equipment specifications.
Specifications and characteristics are subject to change without notice; please refer to
tek.com/keithley
Example reading limit calculation
Assume you are testing the 10 V dc range using a 10 V input value. Using the DMM6500 one-year
accuracy specification for 10 V dc of ± (25 ppm of reading + 5 ppm of range), the calculated limits are:
• Reading limits = 10 V ± [(10 V × 25 ppm) + (10 V × 5 ppm)]
for the most recent specifications.
(the temperature at which
CAL
• Reading limits = 10 V ± (0.00025 + 0.00005) V
• Reading limits = 10 V ± 0.00030 V
• Reading limits = 9.99970 V to 10.00030 V
Calculating resistance reading limits
Resistance reading limits must be recalculated based on the actual calibration resistance values
supplied by the equipment manufacturer. Calculations are performed in the same manner as shown
in the preceding example. Use the actual calibration resistance values instead of the nominal values
in the example when performing your calculations.
For example, assume that you are testing the 10 kΩ range using an actual 10.03 kΩ calibration
resistance value. Using DMM6500 one-year 10 kΩ range accuracy of ± (75 ppm of reading + 6 ppm
of range), the calculated reading limits are:
• Reading limits = 10.03 kΩ ± [(10.03 kΩ x 75 ppm) + (10 kΩ x 6 ppm)]
• Reading limits = 10.03 kΩ ± [(0.7523) + (0.06)] Ω
• Reading limits = 10.03 kΩ ± 0.8123 Ω
• Reading limits = 10.029188 kΩ to 10.030812 kΩ
2-4 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
Performing the verification test procedures
The following topics provide a summary of calibration verification test procedures and items to
consider before performing any calibration verification test.
Test summary
Front-panel tests:
• DC voltage verification (on page 2-6)
• AC voltage verification (on page 2-10)
• Digitize voltage verification (on page 2-14)
• Frequency verification (on page 2-17)
• Simulated thermocouple type J temperature verification (on page 2-18)
• Simulated RTD temperature verification (on page 2-20)
• Resistance verification (on page 2-24)
• DC current verification (on page 2-29)
• Digitize current verification (on page 2-33)
• AC current verification (on page 2-36)
• Capacitance verification (on page 2-39)
• Verifying zero values using a 4-wire short (on page 2-41)
Rear-panel tests:
• DC current 10 A range verification (on page 3-24)
• Digitize current 10 A range verification (on page 2-45)
• AC current 10 A verification (on page 2-47)
DMM6500-905-01 Rev. E June 2022 2-5
Section
Calibration and Adjustment Manual
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
Test considerations
When performing the calibration verification procedures:
• Be sure to restore factory front-panel defaults. From the front panel, select the MENU key, select
Info/Manage, and select System Reset.
• Make sure that the test equipment is warmed up for the time recommended by the manufacturer
and is connected to the DMM6500 input/output terminals.
• Make sure that the correct DMM6500 terminals are selected with the TERMINALS FRONT/REAR
switch.
• Make sure the test equipment is set up for the proper function and range.
• Do not connect test equipment to the DMM6500 through a scanner, multiplexer, or other
switching equipment.
The front and rear terminals of the instrument are rated for connection to circuits rated
Measurement Category II up to 300 V, as described in International Electrotechnical
Commission (IEC) Standard IEC 60664. This range must not be exceeded. Do not connect the
instrument terminals to CAT III or CAT IV circuits. Connection of the instrument terminals to
circuits higher than CAT II can cause damage to the equipment and severe personal injury.
Front-panel calibration verification
The following topics describe verification procedures that are done with connections attached to the
terminals on the DMM6500 front panel.
DC voltage verification
The maximum input voltage between INPUT HI and INPUT LO is 1000 V dc and 750 V ac.
Exceeding this value may create a shock hazard.
The maximum common-mode voltage (the voltage between INPUT LO and chassis ground) is
500 V
hazard.
. Exceeding this value may cause a breakdown in insulation that can create a shock
PEAK
2-6 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
Verify dc voltage accuracy for the 100 mV to 1000 V ranges
To verify 100 mV to 1000 V dc voltage accuracies, you will:
• Apply accurate dc voltages from the calibrator to the DMM6500 front-panel terminals.
• Verify that the displayed readings are within specified limits.
• Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation
page 2-4)).
Use shielded low-thermal connections when testing the 100 mV and 1 V ranges to avoid errors
caused by noise or thermal effects. Connect the shield to the output LO terminal of the calibrator.
To verify dc voltage accuracy:
1. Use a low-thermal cable to connect the DMM6500 HI and LO INPUT terminals to the calibrator HI
and LO terminals as shown in the following figure.
(on
Figure 1: DC voltage 100 mV to 1000 V ranges verification connections
2. On the DMM6500, press the FUNCTION key and select DC voltage.
3. On the home screen, select the button next to Range and select 100 mV.
4. Press the MENU key.
5. Under Measure, select Settings.
6. Set Input Impedance to Auto.
7. Set the calibrator output to 0 V.
8. Set the calibrator to OPERATE.
DMM6500-905-01 Rev. E June 2022 2-7
Section
Calibration and Adjustment Manual
Perform relative
offset
0
-0.01
0.01
Full scale (+)
100
99.9935
100.0065
Half scale (+)
50
49.995
50.005
Half scale (–)
-50
-50.005
-49.995
Full scale (–)
-100
-100.0065
-99.9935
Full scale (+)
1
0.999969
1.000031
Half scale (+)
0.5
0.499979
0.500021
Half scale (–)
-0.5
-0.500021
-0.499979
Full scale (–)
–1
–1.000031
-0.999969
Full scale (+)
10
9.9997
10.0003
Half scale (–)
–5
–5.00018
–4.99982
Full scale (–)
–10
–10.0003
–9.9997
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
9. Allow 5 minutes of settling time.
10. Press the MENU key.
11. Select Calculations.
12. [Only for the 100 mV range] Select Rel Acquire.
13. Source positive and negative full-scale and half-scale voltages and allow for proper settling.
14. Select each range on the DMM6500, allow for proper settling, and verify the ranges according to
the following tables.
Verify the dc voltage 100 mV range
Description Nominal value Lower limit Upper limit
Verify the dc voltage 1 V range
Description Nominal value Lower limit Upper limit
Verify the dc voltage 10 V range
Description Nominal value Lower limit Upper limit
Half scale (+) 5 4.99982 5.00018
2-8 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
Full scale (+)
100
99.954
100.0046
Half scale (–)
-50
-50.00315
-49.99685
Full scale (+)
1000
999.944
1000.056
Half scale (–)
-500
-500.026
-499.974
Full scale (–)
-1000
-1000.069
-999.931
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
Verify the dc voltage 100 V range
The information in this section is intended for qualified service personnel only, as described
by the types of product users in the Safety precautions pages, provided at the beginning of
this document. Do not attempt these procedures unless you are qualified to do so.
Some of these procedures may expose you to hazardous voltages, that if contacted, could
cause personal injury or death. Use appropriate safety precautions when working with
hazardous voltages.
Description Nominal value Lower limit Upper limit
Half scale (+) 50 49.99685 50.00315
Full scale (–) -100 -100.0054 -99.9946
Verify the dc voltage 1000 V range
Description Nominal value Lower limit* Upper limit*
Half scale (+) 500 499.974 500.026
*For each additional volt over ±500 V, add 0.02 mV of uncertainty.
DMM6500-905-01 Rev. E June 2022 2-9
Section
Calibration and Adjustment Manual
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
AC voltage verification
To verify ac voltage accuracy:
• For the 100 mV to 100 V ranges, apply accurate voltages from the calibrator to the DMM6500
front-panel terminals.
• For the 750 V range, connect the Fluke 5725A Amplifier to the calibrator. Apply accurate voltages
from the calibrator terminals to the terminals on the front panel of the DMM6500.
• Verify that the displayed readings are within specified limits.
Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation
2-4)).
The maximum input voltage between INPUT HI and INPUT LO is 750 V dc. Exceeding this
value may create a shock hazard.
(on page
The maximum common-mode voltage (the voltage between INPUT LO and chassis ground) is
500 V
. Exceeding this value may cause a breakdown in insulation that can create a shock
PEAK
hazard.
Verify ac voltage accuracy for the 100 mV to 100 V ranges
Use shielded, low-capacitance cabling. For the 100 mV to 100 V ranges, avoid loading that exceeds
1000 pF.
Excessive capacitance may result in additional load regulation uncertainties and could cause the
calibrator output to open (go into standby).
2-10 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
To verify ac voltage accuracy:
1. Connect the DMM6500 HI and LO INPUT connectors to the calibrator as shown in the following
figure.
Figure 2: Connections for ac voltage verification 100 mV to 100 V ranges
2. On the DMM6500, press the FUNCTION key and select AC voltage.
3. On the home screen, select the button next to Range and select 100 mV.
4. Press the MENU key.
5. Under Measure, select Settings.
6. Make sure that detector bandwidth is set to 30 Hz.
AC voltage is specified for the detector bandwidth setting of 3 Hz. Three Hz measures accurately for
input signals from 3 Hz to 300 kHz, with reading rates ≈ 2 readings/s. To improve verification
throughput to ≈ 20 readings/s, set detector bandwidth to 30 Hz for frequencies of 30 Hz to 300 kHz.
To verify frequencies 1 kHz and higher, set the detector bandwidth to 300 Hz for faster ≈ 200
readings/s throughput.
7. Source ac voltages for each of the frequencies listed in the Verify the ac voltage 100 mV range
(on page 2-12) table.
8. Repeat these steps for each range and frequency listed in the tables below. For each voltage
setting, be sure that the reading is within low and high limits.
DMM6500-905-01 Rev. E June 2022 2-11
Section
Calibration and Adjustment Manual
0.1
20 Hz
99.91
100.09
0.1
1 kHz
99.91
100.09
0.1
50 kHz
99.83
100.17
0.1
100 kHz
99.32
100.68
1
20 Hz
.9991
1.0009
1
50 kHz
.9983
1.0017
1
100 kHz
.9932
1.0068
10
20 Hz
9.991
10.009
10
50 kHz
9.983
10.017
10
100 kHz
9.932
10.068
100
20 Hz
99.910
100.09
100
1 kHz
99.910
100.09
100
50 kHz
99.830
100.17
100
100 kHz
99.320
100.68
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
Verify the ac voltage 100 mV range
Nominal value Frequency Lower limit Upper limit
Verify the ac voltage 1 V range
Nominal value Frequency Lower limit Upper limit
1 1 kHz .9991 1.0009
Verify the ac voltage 10 V range
Nominal value Frequency Lower limit Upper limit
10 1 kHz 9.991 10.009
Verify the ac voltage 100 V range
Nominal value Frequency Lower limit Upper limit
Verify ac voltage accuracy for the 750 V range
Use shielded low capacitance cabling. For the 750 V range, avoid cable capacitances of >150 pF.
Excessive capacitance may result in additional load regulation uncertainties and could cause the
calibrator output to open (go into standby).
2-12 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
To verify ac voltage accuracy for the 750 V range:
1. Put the calibrator in Standby.
2. Connect the DMM6500 HI and LO INPUT connectors to the calibrator as shown in the following
figure.
3. For 750 V at 50 kHz and 100 kHz outputs, connect the calibrator to the Fluke 5725A amplifier.
Figure 3: Connections for ac voltage accuracy verification 750 V range
4. On the DMM6500, press the FUNCTION key and select AC voltage.
5. On the home screen, select the button next to Range and select 750 V.
6. Press the MENU key.
7. Under Measure, select Settings.
8. Ensure that detector bandwidth is set to 30 Hz.
AC voltage is specified for the detector bandwidth setting of 3 Hz. Three Hz measures accurately for
input signals from 3 Hz to 300 kHz, with reading rates ≈ 2 readings/s. To improve verification
throughput to ≈ 200 readings/s, set detector bandwidth to 30 Hz for frequencies of 30 Hz to 300 kHz.
To verify frequencies 1 kHz and higher, set the detector bandwidth to 300 Hz for faster ≈ 200
readings/s throughput.
DMM6500-905-01 Rev. E June 2022 2-13
Section
justment Manual
740
50 Hz
739.33
740.67
740
1 kHz
739.33
740.67
740
100 kHz
734.96
745.04
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning Calibration and Ad
9. Set the calibrator to OPERATE.
10. Source ac voltages for each of the frequencies listed in the "Verify the ac voltage 750 V range"
table, below. Be sure that the readings are within low and high limits.
Verify the ac voltage 750 V range
Nominal value Frequency Lower limit Upper limit
740 50 kHz 738.66 741.34
Digitize dc voltage verification
To verify digitize dc voltage accuracy, you will:
• Apply accurate voltages from the calibrator to the terminals on the front panel of the DMM6500.
• Verify that the displayed readings are within specified limits.
Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation
2-4)).
The maximum input voltage between INPUT HI and INPUT LO is 1000 V dc and 750 V ac.
Exceeding this value may create a shock hazard.
The maximum common-mode voltage (the voltage between INPUT LO and chassis ground) is
500 V
. Exceeding this value may cause a breakdown in insulation that can create a shock
PEAK
hazard.
Verify the digitize voltage 100 mV to 1000 V ranges
Use shielded low-thermal connections when testing the 100 mV and 1 V ranges to avoid errors
caused by noise or thermal effects. Connect the shield to the output LO terminal of the calibrator.
(on page
2-14 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
To verify digitize voltage accuracy:
1. Connect the DMM6500 HI and LO INPUT connectors to the calibrator as shown in the following
figure.
Figure 4: Connections for digitize voltage verification 100 mV to 1000 V ranges
2. On the DMM6500, press the FUNCTION key, select the Digitize Functions tab, and select
Digitize Voltage.
3. On the home screen, select the button next to Range and select 100 mV.
4. Press the MENU key.
5. Under Measure, select Settings.
6. Set the Sample Rate to 1000.
7. Set the Aperture to Auto.
8. Set the Count to 100.
9. Set the calibrator output to 0.00000 mV dc and allow the reading to settle.
10. Press the MENU key.
11. Under Measure, select Calculations.
12. Source positive and negative full-scale and half-scale voltages, as listed in the following table.
Verify the 100 mV to 100 V range settings listed in the tables below. For each voltage setting,
verify that the STATISTICS swipe screen reading for Average is within low and high limits.
The Fluke 5720A or 5730A calibrator 1000 V range 0.0 V setting is not verified.
DMM6500-905-01 Rev. E June 2022 2-15
Section
Calibration and Adjustment Manual
Full scale (+)
100
99.94
100.06
Half scale (+)
50
49.95
50.05
Half scale (–)
-50
-50.05
-49.95
Full scale (–)
-100
-100.06
-99.94
Full scale (+)
1
0.9996
1.0004
Half scale (+)
0.5
0.49975
0.50025
Half scale (–)
-0.5
-0.50025
-0.49975
Full scale (–)
-1
-1.0004
-0.9996
Full scale (+)
10
9.996
10.004
Half scale (+)
5
4.9975
5.0025
Half scale (–)
-5
-5.0025
-4.9975
Full scale (–)
-10
-10.004
-9.996
Full scale (+)
100
99.96
100.04
Half scale (+)
50
49.975
50.025
Half scale (–)
-50
-50.025
-49.975
Full scale (–)
-100
-100.04
-99.96
Half scale (+)
500
499.75
500.25
Half scale (–)
–500
-500.25
-499.75
Full scale (–)
–1000
-1000.4
-999.6
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
Verify the digitize voltage 100 mV range
Description Nominal value Lower limit Upper limit
Verify the digitize voltage 1 V range
Description Nominal value Lower limit Upper limit
Verify the digitize voltage 10 V range
Description Nominal value Lower limit Upper limit
Verify the digitize voltage 100 V range
Description Nominal value Lower limit Upper limit
Verify the digitize voltage 1000 V range
Description Nominal value Lower limit Upper limit
Full scale (+) 1000 999.6 1000.4
2-16 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
Frequency verification
To verify frequency accuracy, you will:
• Apply accurate frequencies from the function generator to the terminals on the front panel of the
DMM6500.
• Verify that the displayed readings are within specified limits.
Use the values in the table following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation
2-4)).
1. Connect the Keithley Instruments Model 3390 function generator to the DMM6500 INPUT HI and
LO terminals as shown in the following figure.
Figure 5: Connections for frequency verification and adjustment
(on page
2. On the DMM6500, press the FUNCTION key, select the Measure Functions tab, and select
Frequency.
3. Select the MENU key.
4. Under Measure, select Settings.
5. Set the Aperture to 250 ms.
6. Set the Threshold Range to 10 V.
7. Press the HOME key.
8. Source the voltage and frequency values as listed in Verify the frequency (on page 2-18
). For
each setting, be sure that the reading is within low and high limits.
DMM6500-905-01 Rev. E June 2022 2-17
Section
libration and Adjustment Manual
10 Hz at 10 V
10
9.997
10.003
10 kHz at 5 V
10
9.9991
10.0009
100 kHz at 5 V
100
99.991
100.009
300 kHz at 5 V
300
299.973
300.027
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning Ca
Verify the frequency
Use the following values to verify the performance of the DMM6500. Actual values depend on
published specifications (see Example reading limit calculation (on page 2-4
Description Frequency (Hz) Lower limit (Hz) Upper limit (Hz)
1 kHz at 5 V 1 0.9999 1.0001
Simulated thermocouple type J temperature verification
To verify thermocouple accuracy, you will:
• Apply accurate voltages from the calibrator to the terminals on the front panel of the DMM6500.
)).
• Verify that the displayed readings are within specified limits.
Thermocouple accuracy is verified by using a dc voltage calibrator to output values from standard
thermocouple tables available from the National Institute of Standards and Technology (NIST) or
other sources.
In the table following the steps below, three representative values are listed from a type J
thermocouple table for temperatures –190 °C, 0 °C, and 750 °C, with their respective thermocouple
voltages listed in the “Uncompensated calibrator source value” column. The calibrator source values
are based on NIST Monograph 175, reference data 60, version 2.0.
Verify thermocouple accuracy
Because the cable connecting the calibrator to the DMM6500 can have non-trivial thermal offset
voltages, you must first correct for these to verify the DMM6500 specifications.
2-18 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
To verify the simulated thermocouple type J temperature:
1. Connect the DMM6500 HI and LO INPUT terminals to the calibrator HI and LO terminals as
shown in the following figure.
Figure 6: Connections for thermocouple verification
2. On the DMM6500, press the FUNCTION key and select DC voltage.
3. Press the MENU key.
4. Under Measure, select Settings.
5. Set the range to 100 mV.
6. Set Input Impedance to Auto.
7. Set autozero to On.
8. Select Integration Rate. The Integration Rate dialog box opens.
9. Set the unit to NPLC.
10. Set NPLC to 1 PLC.
11. Select OK and press the HOME key to return to the Home Screen.
12. Set the calibrator to output 0 V and enable the output.
13. Allow five minutes for settling of the thermal voltage.
14. Record the measured offset voltage to 1 µV precision. If necessary, use the DMM6500 filter
settings to reduce the noise of this measurement (for filter settings, go to MENU > Measure
Calculations).
15. Press the DMM6500 FUNCTION key and select Temperature.
16. Press the MENU key.
17. Under Measure, select Settings.
DMM6500-905-01 Rev. E June 2022 2-19
Section
Calibration and Adjustment Manual
–190 °C
–7.659 mV
–190.2 °C
–189.8 °C
0 °C
0.000 mV
–0.2 °C
0.2 °C
750 °C
42.281 mV
749.8 °C
750.2 °C
2: Performance verification DMM6500 6½-Digit Multimeter with Scanning
18. On the Measure Settings screen, set the following values:
Units: °C
Transducer: TC
Thermocouple: J
Temperature (simulated reference temperature): 0 °C
Integration Rate: 1 PLC
Auto Zero: On
19. Set the calibrator to the simulated thermocouple voltage you want (from the following table), first
correcting for the offset voltage measured in step 14. For example, if the measured offset voltage
was –2 µV, set the calibrator to –7.659 mV – (–0.002 mV), which equals –7.657 mV, to simulate
–190 °C.
20. Verify that the DMM6500 reading is within lower and upper limits.
21. Repeat steps 18 and 19 for each value in the following table.
se the following values to verify the performance of the DMM6500. Actual values depend on
U
published specifications (see Example reading limit calculation (on page 2-4
)).
Simulated
temperature
Uncompensated
calibrator source
value (V)
Lower limit Upper limit
Simulated RTD temperature verification
Use the following information to verify the performance of the DMM6500. Actual calibrator source
values will vary. RTD verification is based on the calibrator sourcing resistance and the DMM6500
conversion of the resistance measurement to calculated temperature based on the Callendar-Van
Dusen equation.
To verify RTD temperature accuracy, you will:
• Apply accurate resistance from the calibrator to the terminals on the front panel of the DMM6500.
• Verify that the displayed readings are within specified limits.
2-20 DMM6500-905-01 Rev. E June 2022
DMM6500
Performance verification
6½-Digit Multimeter with Scanning Calibration and Adjustment Manual Section 2:
RTD equations
The temperature versus resistance readings listed in the RTD reference tables are calculated using
the Callendar-Van Dusen equation. There are two equations that are based on different temperature
ranges. There is an equation for the –200 °C to 0 °C range and one for the 0 °C to 850 °C range.
Equation for –200 °C to 0 °C temperature range
R
= R0 [1 + AT + BT2 + CT3(T – 100)]
RTD
where:
• R
• R
is the calculated resistance of the RTD
RTD
is the known RTD resistance at 0 °C
0
• T is the temperature in °C
• A = alpha [1 + (delta/100)]
• B = –1 (alpha)(delta)(1E-4)
• C = –1 (alpha)(beta)(1E-8)
The alpha, beta, and delta values are listed in the following table.
Equation for 0 °C to 850 °C temperature range
R
= R0 (1 + AT + BT2)
RTD
where:
• R
• R
is the calculated resistance of the RTD
RTD
is the known RTD resistance at 0 °C
0
• T is the temperature in °C
• A = alpha [1 + (delta/100)]
• B = –1 (alpha)(delta)(1E-4)
The alpha and delta values are listed in the following table.
DMM6500-905-01 Rev. E June 2022 2-21
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