Fluke 5700A II, 5720A II User Manual
5700A/5720A Series II
®
Multi-Function Calibrator
Operators Manual
PN 601622
May 1996 Rev. 1, 3/02
© 1996, 2002 Fluke Corporation. All rights reserved. Printed in U.S .A.
All product names are trademarks of their respective companies.
LIMITED WARRANTY & LIMITATI O N OF LIABILITY
Each Fluke product is warranted to be free fr om defects in material and workmanship
under normal use and service. The warranty period is one year and begins on the date
of shipment. Parts, product repairs and services are warranted for 90 days. This
warranty extends only to the original buyer or end- user customer of a Fluke authorized
reseller, and does not apply to fuses, disposable batt er ies or to any product which, in
Fluke’s opinion, has been misused, altered, neglected or damaged by accident or
abnormal conditions of operation or handling. Fluke warr ant s t hat software will operate
substantially in accordance with its functional specifications for 90 days and that it has
been properly recorded on non-defective media. Fluke does not war r ant that software
will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to
end-user customers only but have no authority t o extend a greater or different warr anty
on behalf of Fluke. Warranty support is available if product is purchased through a Fluke
authorized sales outlet or Buyer has paid the applicable international price. Fluke
reserves the right to invoice Buyer for im por tation costs of repair/replacement par t s
when product purchased in one country is submitted f or r epair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase pr ice,
free of charge repair, or replacem ent of a defective product which is returned to a Fluke
authorized service center within the warranty period.
To obtain warranty service, contact your near est Fluke authorized service center or
send the product, with a description of the dif ficulty, postage and insurance prepaid
(FOB Destination), to the nearest Fluke authorized service center. Fluke assumes no
risk for damage in transit. Following warr ant y r epair , the product will be returned to
Buyer, transportation prepaid (FO B Dest inat ion) . If Fluke determines that the failur e
was caused by misuse, alteration, accident or abnormal condition of operation or
handling, Fluke will provide an estimate of repair costs and obt ain aut horization before
commencing the work. Following repair, t he pr oduct will be returned to the Buyer
transportation prepaid and the Buyer will be billed for t he r epair and return transportation
charges (FOB Shipping Point).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU O F
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIM ITED
TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECI AL,
INDIRECT, INCIDENTAL OR CO NSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, W HETHER ARI SING FROM BREACH OF WARRANTY
OR BASED ON CONTRACT, TORT, RELI ANCE O R ANY OTHER THEORY.
Since some countries or states do not allow limitat ion of the term of an implied warranty,
or exclusion or limitation of incidental or consequential damages, the limitations and
exclusions of this warranty may not apply to every buyer . If any provision of this
Warranty is held invalid or unenforceable by a court of com petent jurisdiction, such
holding will not affect the validity or enfor ceabilit y of any other provision.
Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett, WA 98206-9090 5602 BD Eindhoven
U.S.A. The Netherlands
5/94
Claims
Immediately upon arrival, purchaser shall check the packing container against the enclosed
packing list and shall, within thirty (30) days of arrival, give Fluke notice of shortages or any
nonconformity with the terms of the order. If purchaser fails to five notice, the delivery shall be
deemed to conform with the terms of the order.
The purchaser assumes all risk of loss or damage to instruments upon delivery by Fluke to the
carrier. If an instrument is damaged in transit, PURCHASER MUST FILE ALL CLAIMS FOR
DAMAGE WITH THE CARRIER to obtain compensation. Upon request by purchaser, Fluke will
submit an estimate of the cost to repair shipment damage.
Fluke will be happy to answer all questions to enhance the use of this instrument. Please address
your requests or correspondence to: Fluke Corporation, P.O. Box 9090, Everett, WA 98206-9090.
Declaration of the Manufacturer or Importer
We hereby certify that the Fluke Models 5700A Series II and 5720A Series II are in compliance
with Postal Regulation Vfg. 1046 and is RFI suppressed. The marketing and sale of the equipment
was reported to the German Postal Service. The right to retest this equipment to verify compliance
with the regulation was given to the German Postal Service.
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daβ Fluke Models 5700A Series II und 5720A Series II in
Übereinstimung mit den Bestimmungen der Amtsblattverfügung Vfg. 1046 funk-entstört ist, Der
Deutschen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt und die
Berechtigung zur Überprüfung der Seire auf Einhaltung der Bestimmungen eingeräumt.
Fluke Corporation
Interference Information
This equipment generates and uses radio frequency energy and if not installed and used in strict
accordance with the manufacturer’s instructions, may cause interference to radio and television
reception. It has been type tested and found to comply with the limits for a Class B computing
device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are
designed to provide reasonable protection against such interference in a residential installation.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by one
of more of the following measures:
• Reorient the receiving antenna
• Relocate the equipment with respect to the receiver
• Move the equipment away from the receiver
• Plug the equipment into a different outlet so that the computer and receiver are on different
branch circuits
If necessary, the user should consult the dealer or an experienced radio/television technician for
additional suggestions. The user may find the following booklet prepared by the Federal
Communications Commission helpful: How to Identify and Resolve Radio-TV Interference
Problems. This booklet is available from the U.S. Government Printing Office, Washington, D.C.
20402. Stock No. 004-000-00345-4.
OPERATOR SAFETY
SUMMARY
WARNING
HIGH VOLTAGE
is used in the operation of this equipment
LETHAL VOLTAGE
may be present on the terminals, observe all safety precautions!
To avoid electrical shock hazard, the operator should not electrically
contact the output hi or sense hi binding posts. During operation, lethal
voltages of up to 1100V ac or dc may be present on these terminals.
Whenever the nature of the operation permits, keep one hand away from
equipment to reduce the hazard of current flowing thought vital organs of
the body.
Terms in this Manual
This instrument has been designed and tested in accordance with the safety standards
listed in the General Specifications, which are located in the Specifications section in
Chapter 1 of this Operator Manual. This manual contains information and warnings which
have to be followed by the user to ensure safe operation and to retain the instrument in
safe condition.
WARNING statements identify conditions or practices that could result in personal injury or
loss of life.
CAUTION statements identify conditions or practices that could result in damage to the
equipment or other property.
Symbols Marked on Equipment
DANGER — High Voltage
Protective ground (earth) terminal
Attention — refer to the manual. This symbol indicates that information about
the usage of a feature is contained in the manua
l.
Power Source
The 5700A Series II and 5720A Series II are intended to operate from a power source that
will not apply more than 264V ac rms between the supply conductors or between either
supply conductor and ground. A protective ground connection by way of the grounding
conductor in the power cord is essential for safe operation.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified on the line voltage selection switch label,
and which is identical in type voltage rating, and current rating.
Grounding the 5700A Series II or 5720A Series I I
The 5700A Series II and 5720A Series II are Safety Class I (grounded enclosure)
instruments as defined in IEC 348. The enclosure is grounded through the grounding
conductor of the power cord. To avoid electrical shock, plug the power cord into a
properly wired earth grounded receptacle before connecting anything to any of the 5700A
Series II or 5720A Series II terminals. A protective ground connection by way of the
grounding conductor in the power cord is essential for safe operation.
Use the Proper Power Cord
Use only the power cord and connector appropriate for proper operation of a 5700A Series
II or 5720A Series II in your country.
Use only a power cord that is in good condition.
For detailed information on power cords, refer to Figure 2-3 in Chapter 2.
Refer cord and connector changes to qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate the 5700A Series II or 5720A Series II in an
atmosphere of explosive gas.
Do Not Remove Cover
To avoid personal injury, do not remove the cover from the 5700A Series II or 5720A
Series II. Do not operate the 5700A Series II or 5720A Series II without the cover
properly installed. There are no user-serviceable parts inside the 5700A Series II or the
5720A Series II, so there is no need for the operator to ever remove the cover.
FIRST AID FOR ELECTRIC SHOCK
Free the Victim From the Live Conductor
Shut off high voltage at once and ground the circuit. If high voltage cannot be turned off
quickly, ground the circuit.
Get Help!
Call loudly for help. Call an emergency number. Request medical assistance.
Never Accept Ordinary and General Tests for Death
Symptoms of electric shock may include unconsciousness, failure to breathe, absence of
pulse, pallor, and stiffness, and well as severe burns.
Treat the Victim
If the victim is not breathing, begin CPR or mouth-to-mouth resuscitation if you are
certified.
Table of Contents
Chapter Title Page
1 Introduction and Specifications........................................................ 1-1
1-1. Introduction.......................................................................................... 1-3
1-2. Instruction Manuals.............................................................................. 1-4
1-3. About this Manual................................................................................ 1-4
1-4. How to Use this Manual....................................................................... 1-5
1-5. Wideband AC Voltage Module (Option 5700A-03)............................ 1-5
1-6. Auxiliary Amplifier.............................................................................. 1-5
1-7. 5725A Amplifier.............................................................................. 1-6
1-8. Support Equipment and Services ......................................................... 1-6
1-9. 732B Direct Voltage Reference Standard........................................ 1-6
1-10. 732B-200 Direct Volt Maintenance Program (U.S.A. Only) .......... 1-7
1-11. 742A Series Resistance Standards................................................... 1-7
1-12. Wideband AC Module (Option 5700A-03) Calibration Support .... 1-7
1-13. Service Centers ................................................................................ 1-7
1-14. The Components of the 5700A/5720A Series II Calibrator................. 1-8
1-15. Calibrating the 5700A/5720A Series II Calibrator............................... 1-8
1-16. The Calibration Process................................................................... 1-10
1-17. Establishing Traceability ................................................................. 1-10
1-18. Calibration Reports.......................................................................... 1-10
1-19. Calibration Check................................................................................. 1-11
1-20. Developing a Performance History...................................................... 1-11
1-21. Range Calibration ................................................................................ 1-11
1-22. DC Zeros Calibration ........................................................................... 1-11
1-23. Specifications....................................................................................... 1-12
1-24. Specification Confidence Levels ..................................................... 1-12
1-25. Using Absolute and Relative Uncertainty Specifications................ 1-12
1-26. Using Secondary Performance Specifications................................. 1-12
1-27. DC Voltage Specifications................................................................... 1-13
1-28. AC Voltage Specifications................................................................... 1-16
1-29. Resistance Specifications..................................................................... 1-22
1-30. DC Current Specifications ................................................................... 1-26
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Operators Manual
2 Installation.......................................................................................... 2-1
3 Features.............................................................................................. 3-1
1-31. AC Current Specifications ................................................................... 1-29
1-32. Wideband AC Voltage (Option 5700-03) Specifications .................... 1-34
1-33. General Specifications.......................................................................... 1-35
1-34. Auxiliary Amplifier Specifications...................................................... 1-36
2-1. Introduction.......................................................................................... 2-3
2-2. Unpacking and Inspection.................................................................... 2-3
2-3. Service Information.............................................................................. 2-4
2-4. Contacting Fluke .................................................................................. 2-4
2-5. Placement and Rack Mounting............................................................. 2-4
2-6. Cooling Considerations........................................................................ 2-4
2-7. Accessing the Fuse............................................................................... 2-5
2-8. Selecting Line Voltage......................................................................... 2-6
2-9. Connecting to Line Power.................................................................... 2-8
2-10. Connecting a 5725A Amplifier............................................................ 2-8
2-11. Selecting Output Binding Posts............................................................ 2-8
3-1. Introduction.......................................................................................... 3-3
3-2. Front Panel Features............................................................................. 3-3
3-3. Display Screen Saver....................................................................... 3-3
3-4. Rear Panel Features.............................................................................. 3-12
3-5. Softkey Menu Tree............................................................................... 3-14
4 Front Panel Operation ....................................................................... 4-1
4-1. Introduction.......................................................................................... 4-3
4-2. Powering on the Calibrator .................................................................. 4-4
4-3. Warm Up.............................................................................................. 4-4
4-4. DC Zeros .............................................................................................. 4-5
4-5. Executing DC Zeros......................................................................... 4-5
4-6. DC Zeros Reminder......................................................................... 4-5
4-7. The Setup Menu ................................................................................... 4-6
4-8. Instrument Setup.............................................................................. 4-7
4-9. Format EEPROM Menu................................................................... 4-7
4-10. Spec Format Setup Menu................................................................. 4-8
4-11. Setting the Internal Clock/Calendar................................................. 4-9
4-12. Selecting Amplifiers ........................................................................ 4-10
4-13. Checking the Instrument Configuration........................................... 4-11
4-14. Special Functions Menu................................................................... 4-12
4-15. Resetting the Calibrator........................................................................ 4-12
4-16. Operate and Standby Modes................................................................. 4-13
4-17. Connecting the Calibrator to a UUT.................................................... 4-13
4-18. Recommended Cable and Connector Types.................................... 4-13
4-19. When to Use External Sensing ........................................................ 4-14
4-20. When to Use the External Voltage Guard........................................ 4-15
4-21. When to Use the Current Guard....................................................... 4-15
4-22. Four-Wire Vs. Two-Wire Resistance Connections ......................... 4-16
4-23. Cable Connection Instructions......................................................... 4-16
4-24. Setting the Output................................................................................. 4-22
4-25. DC Voltage Output .......................................................................... 4-24
4-26. AC Voltage Output .......................................................................... 4-25
4-27. DC Current Output........................................................................... 4-27
ii
Contents
4-28. AC Current Output........................................................................... 4-28
4-29. Resistance Output ............................................................................ 4-30
4-30. Wideband AC Voltage Output (Option 5700A-03)......................... 4-32
4-31. Variable Phase Output ..................................................................... 4-34
4-32. Phase Locking to an External Signal.................................................... 4-35
4-33. Using an Auxiliary Amplifier............................................................... 4-36
4-34. 5725A Amplifier Output.................................................................. 4-37
4-35. Checking the Calibrator’s Uncertainty Specification .......................... 4-38
4-36. Error Mode Operation.......................................................................... 4-38
4-37. Error Mode Overview...................................................................... 4-39
4-38. Entering Error Mode.................................................................... 4-39
4-39. Exiting Error Mode...................................................................... 4-39
4-40. Using Error Mode........................................................................ 4-40
4-41. Reading the UUT Error: AC and DC Voltage and Current Output. 4-40
4-42. Reading the UUT Error: Resistance Output .................................... 4-41
4-43. Introduction to Offset, Scale, and Linearity Errors.............................. 4-42
4-44. Offset Error...................................................................................... 4-42
4-45. Scale Error ....................................................................................... 4-43
4-46. Linearity Error ................................................................................. 4-44
4-47. Combining the Error Types.............................................................. 4-44
4-48. Programming an Offset........................................................................ 4-45
4-49. Programming a Scale Factor ................................................................ 4-46
4-50. Linearity Checking Using Offset and Scale......................................... 4-47
4-51. Setting Output Limits........................................................................... 4-50
4-52. Setting Voltage and Current Limits................................................. 4-50
4-53. Sample Applications............................................................................. 4-51
4-54. Calibrating Fluke 70 Series Multimeter........................................... 4-51
4-55. Cables .......................................................................................... 4-52
4-56. Guarding...................................................................................... 4-52
4-57. Sensing......................................................................................... 4-52
4-58. Testing the Meter......................................................................... 4-53
4-59. Calibrating the Meter................................................................... 4-54
4-60. Calibrating a Fluke Model 8840A Series Digital Multimeter ......... 4-56
4-61. Cables .......................................................................................... 4-56
4-62. Guarding...................................................................................... 4-56
4-63. Sensing......................................................................................... 4-58
4-64. Basic Calibration Procedure........................................................ 4-58
4-65. Calibration Setup Procedure........................................................ 4-58
4-66. A/D Calibration ........................................................................... 4-59
4-67. Offset and Gain Calibration......................................................... 4-60
4-68. High Frequency AC Calibration.................................................. 4-62
4-69. Performing A Wideband Flatness Test............................................ 4-63
(continued)
5 Remote Operation.............................................................................. 5-1
5-1. Introduction.......................................................................................... 5-3
5-2. Using the IEEE-488 Port for Remote Control...................................... 5-4
5-3. IEEE-488 Bus Restrictions .............................................................. 5-4
5-4. Bus Setup Procedure........................................................................ 5-4
5-5. Using the RS-232C Port for Remote Control....................................... 5-5
5-6. Serial Remote Control Setup Procedure.......................................... 5-6
5-7. Exceptions for Serial Remote Control............................................. 5-7
5-8. Command Syntax Information ............................................................. 5-7
5-9. Parameter Syntax Rules................................................................... 5-8
5-10. Extra Space Characters.................................................................... 5-9
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5700A/5720A Series II
Operators Manual
5-11. Terminators...................................................................................... 5-9
5-12. Incoming Character Processing........................................................ 5-9
5-13. Response Message Syntax............................................................... 5-10
5-14. Input Buffer Operation......................................................................... 5-10
5-15. Commands............................................................................................ 5-10
5-16. Multiple Commands......................................................................... 5-11
5-17. Coupled Commands......................................................................... 5-11
5-18. Sequential and Overlapped Commands........................................... 5-12
5-19. Commands Ignored When Not in Remote....................................... 5-12
5-20. Commands that Require the Calibration Switch to be Set............... 5-12
5-21. Long Term Commands..................................................................... 5-12
5-22. Local-to-Remote State Transitions....................................................... 5-43
5-23. Checking the Calibrator’s Status.......................................................... 5-45
5-24. Serial Poll Status Byte ..................................................................... 5-47
5-25. Service Request Line (SRQ)........................................................ 5-48
5-26. Service Request Enable Register................................................. 5-48
5-27. Loading the SRE.......................................................................... 5-48
5-28. Event Status Register....................................................................... 5-49
5-29. Bit Assignments for the ESR and ESE........................................ 5-49
5-30. Reading the ESR and ESE........................................................... 5-50
5-31. Loading the ESE.......................................................................... 5-50
5-32. Instrument Status Register............................................................... 5-51
5-33. Instrument Status Change Register.................................................. 5-51
5-34. Instrument Status Change Enable Register...................................... 5-51
5-35. Bit Assignments for the ISR, ISCR, and ISCE............................ 5-51
5-36. Reading the ISR, ISCR, or ISCE................................................. 5-52
5-37. Loading the ISCE......................................................................... 5-52
5-38. Fault Queue...................................................................................... 5-53
5-39. IEEE-488 Interface Configuration ....................................................... 5-54
5-40. Bus Communication Overview............................................................ 5-55
5-41. Definition: Queries and Commands................................................. 5-56
5-42. Functional Elements Of Commands................................................ 5-56
5-43. Interface Messages........................................................................... 5-58
5-44. The IEEE-488 Connector..................................................................... 5-60
5-45. Remote Program Examples.................................................................. 5-61
5-46. Printing Main Output Calibration Shift Results .............................. 5-61
5-47. Verifying a Meter............................................................................. 5-62
5-48. Remote Calibration.......................................................................... 5-62
5-49. DC Zeros...................................................................................... 5-62
5-50. Calibration................................................................................... 5-63
5-51. Calibration Check........................................................................ 5-64
5-52. Wideband AC Module (Option 5700A-03) Gain Calibration..... 5-65
5-53. Using *OPC?, *OPC, and *WAI..................................................... 5-66
5-54. Writing an SRQ and Fault Handler.................................................. 5-67
5-55. Emulating a Fluke 5100B or 5200A Calibrator................................... 5-68
5-56. Entering Emulation Mode................................................................ 5-68
5-57. Exiting Emulation Mode.................................................................. 5-69
5-58. The 5720’s Display During Emulation............................................ 5-69
5-59. 5100B Emulation.................................................................................. 5-69
5-60. Local-to-Remote Transitions........................................................... 5-69
5-61. Current Output Location.................................................................. 5-70
5-62. Differences in the 5700A/5720A Series II and
5100B Ohms Function................................................................... 5-70
5-63. Ohms Remote Program Modifications for 5100B Emulation.......... 5-71
5-64. 5200A Emulation ................................................................................. 5-72
iv
Contents
5-65. Local-to-Remote Transitions........................................................... 5-72
5-66. Voltage and Frequency Ranges........................................................ 5-72
5-67. Rounding Numeric Entries............................................................... 5-73
5-68. Settling Times.................................................................................. 5-73
5-69. Programming External Sensing........................................................ 5-74
5-70. Overload Conditions........................................................................ 5-74
5-71. Phase Lock Errors............................................................................ 5-74
6 Using the RS-232C Serial Interface .................................................. 6-1
6-1. Introduction.......................................................................................... 6-3
6-2. RS-232C Interface Specifications........................................................ 6-3
6-3. Setting Up and Connecting the Serial Interface................................... 6-4
6-4. Printing Calibration Reports................................................................. 6-6
6-5. Calibration Shift Results.................................................................. 6-6
6-6. Calibration Check Shift Results....................................................... 6-7
6-7. Generating a Printout....................................................................... 6-8
7 Operator Maintenance....................................................................... 7-1
7-1. Introduction.......................................................................................... 7-3
7-2. Accessing the Fuse............................................................................... 7-4
7-3. Cleaning the Air Filter.......................................................................... 7-4
7-4. Cleaning the Exterior ........................................................................... 7-6
7-5. Calibration............................................................................................ 7-6
7-6. Calibrating the 5700A/5720A Series II to External Standards............ 7-6
7-7. Calibration Requirements ................................................................ 7-7
7-8. When to Adjust the Calibrator’s Uncertainty.................................. 7-7
7-9. Calibration Procedure ...................................................................... 7-8
7-10. Range Calibration................................................................................. 7-14
7-11. Calibrating the Wideband AC Module (Option 5700A-03)................. 7-18
7-12. Performing a Calibration Check........................................................... 7-21
(continued)
8 Options and Accessories.................................................................. 8-1
8-1. Introduction.......................................................................................... 8-3
8-2. Wideband AC Voltage Module (Option 5700A-03............................. 8-3
8-3. Accessories........................................................................................... 8-3
8-4. Low Thermal EMF Test Leads........................................................ 8-4
8-5. Rack Mount Kits (Y5737 and Y5735)............................................. 8-4
8-6. Shielded IEEE-488 Interface Cables (Y8021, Y8022, and Y8023). 8-4
8-7. RS-232C Null-Modem Cables (Y1702 and Y1703)........................ 8-4
8-8. DC Voltage Reference Standard (732B).......................................... 8-4
8-9. 1Ω and 10 kΩ Resistance Standards (742A-1 and 742A-10k)........ 8-5
8-10. 5725A Amplifier .................................................................................. 8-5
Appendices
Fault Codes........................................................................................................A-1
ASCII and IEEE Bus Codes..............................................................................B-1
Symbolic Names of Calibration Constants .......................................................C-1
Glossary.............................................................................................................D-1
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5700A/5720A Series II
Operators Manual
vi
List of Tables
Table Title Page
1-1. Auxiliary Amplifier Data....................................................................................... 1-6
1-2. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-13
1-3. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-14
1-4. DC Voltage Secondary Performance Specifications and
Operating Characteristics .................................................................................... 1-15
1-5. 5720A Series II AC Voltage Specifications: 99 % Confidence Level.................. 1-16
1-6. 5720A Series II AC Voltage Specifications: 95 % Confidence Level.................. 1-17
1-7. 5700A Series II AC Voltage Specifications: 99 % Confidence Level.................. 1-18
1-8. 5700A Series II AC Voltage Specifications: 95 % Confidence Level.................. 1-19
1-9. AC Voltage Secondary Performance Specifications and
Operating Characteristics .................................................................................... 1-20
1-10. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels.. 1-22
1-11. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels.. 1-23
1-12. Resistance Secondary Performance Specifications and
Operating Characteristics .................................................................................... 1-24
1-13. Current Derating Factors....................................................................................... 1-25
1-14. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels. 1-26
1-15. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels. 1-27
1-16. DC Current Secondary Performance Specifications and
Operating Characteristics .................................................................................... 1-28
1-17. 5720A Series II AC Current Specifications: 99 % Confidence Level................... 1-29
1-18. 5720A Series II AC Current Specifications: 95 % Confidence Level................... 1-30
1-19. 5700A Series II AC Current Specifications: 99 % Confidence Level................... 1-31
1-20. 5700A Series II AC Current Specifications: 95 % Confidence Level................... 1-32
1-21. AC Current Secondary Performance Specifications and
Operating Characteristics .................................................................................... 1-33
1-22. Wideband AC Voltage (Option 5700-03) Specifications...................................... 1-34
2-1. Standard Equipment............................................................................................... 2-3
2-2. Line Power Cord Types Available from Fluke...................................................... 2-6
3-1. Front Panel Features.............................................................................................. 3-4
3-2. Rear Panel Features............................................................................................... 3-12
4-1. Auxiliary Amplifier Data....................................................................................... 4-14
4-2. UUT Connection Figures....................................................................................... 4-16
4-3. Keys that Exit Error Mode..................................................................................... 4-39
4-4. 8840A A/D Converter Calibration Prompts .......................................................... 4-59
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5700A/5720A Series II
Operators Manual
4-5. 8840A A/D Calibration Allowable Errors............................................................. 4-60
4-6. 8840A Offset and Gain Calibration Prompts......................................................... 4-61
4-7. 8840A High-Frequency AC Calibration Prompts.................................................. 4-62
5-1. Command Summary by Function.......................................................................... 5-13
5-2. Commands ............................................................................................................. 5-17
5-3. Serial Remote Control Commands........................................................................ 5-42
5-4. Range Identifiers for Remote Commands.............................................................. 5-42
5-5. Operating State Transitions................................................................................... 5-44
5-6. Status Register Summary....................................................................................... 5-45
5-7. Supported IEEE-488 Interface Function Subsets.................................................. 5-54
5-8. Functional Elements of Commands....................................................................... 5-57
5-9. Interface Messages Accepted by the Calibrator.................................................... 5-58
5-10. Interface Messages Sent by the Calibrator............................................................ 5-59
6-1. RS-232C Interface Parameter Choices.................................................................. 6-4
6-2. Annotation for Shift Results Printout.................................................................... 6-16
7-1. Standards for Calibrating 5700A/5720A Series II................................................. 7-7
8-1. Accessories............................................................................................................ 8-3
viii
List of Figures
Figure Title Page
1-1. Time and Costs: Calibrator Calibration................................................................. 1-9
1-2. Volt-Hertz Capability ............................................................................................ 1-21
2-1. Accessing the Fuse ................................................................................................ 2-5
2-2. Line Power Cord Types Available from Fluke...................................................... 2-6
2-3. Line Power Label and Switch Location................................................................. 2-7
3-1. Front Panel Features.............................................................................................. 3-5
3-2. Rear Panel Features............................................................................................... 3-13
3-3. Softkey Menu Tree ................................................................................................ 3-15
4-1. UUT Connections: DC Voltage, AC Voltage N+]......................................... 4-17
4-2. UUT Connections: AC Voltage >10 kHz.............................................................. 4-18
4-3. UUT Connections: AC Current $ ..................................................................... 4-19
4-4. UUT Connections: Resistance............................................................................... 4-20
4-5. UUT Wideband AC Voltage Output (Option 5700A-03)..................................... 4-22
4-6. UUT Connections: 5725A Amplified Current Output.......................................... 4-23
4-7. Offset Error............................................................................................................ 4-42
4-8. Scale Error............................................................................................................. 4-43
4-9. Linearity Error....................................................................................................... 4-44
4-10. Meter Response vs. Stimulus................................................................................. 4-47
4-11. Cable Connections for Testing a Fluke 70 Series Multimeter............................... 4-53
4-12. Cable Connections for Calibrating a Fluke 70 Series Multimeter......................... 4-55
4-13. 8840A Calibration Connections ............................................................................ 4-57
5-1. Overview of Status Data Structure ........................................................................ 5-46
5-2. IEEE-488 Connector Pin Assignments.................................................................. 5-60
6-1. RS-232C Connector Pinout................................................................................... 6-3
7-1. Accessing the Fuse ................................................................................................ 7-4
7-2. Accessing the Air Filter......................................................................................... 7-5
7-3. 732B External Calibration Connections................................................................ 7-9
7-5. 220V DC Range Calibration Connections............................................................. 7-17
7-6. Wideband Module Calibration Connection........................................................... 7-19
ix
5700A/5720A Series II
Operators Manual
x
Chapter 1
Introduction and Specifications
Title Page
1-1. Introduction.......................................................................................... 1-3
1-2. Instruction Manuals.............................................................................. 1-4
1-3. About this Manual................................................................................ 1-4
1-4. How to Use this Manual....................................................................... 1-5
1-5. Wideband AC Voltage Module (Option 5700A-03)............................ 1-5
1-6. Auxiliary Amplifier.............................................................................. 1-5
1-7. 5725A Amplifier.............................................................................. 1-6
1-8. Support Equipment and Services ......................................................... 1-6
1-9. 732B Direct Voltage Reference Standard........................................ 1-6
1-10. 732B-200 Direct Volt Maintenance Program (U.S.A. Only) .......... 1-7
1-11. 742A Series Resistance Standards................................................... 1-7
1-12. Wideband AC Module (Option 5700A-03) Calibration Support .... 1-7
1-13. Service Centers ................................................................................ 1-7
1-14. The Components of the 5700A/5720A Series II Calibrator................. 1-8
1-15. Calibrating the 5700A/5720A Series II Calibrator............................... 1-8
1-16. The Calibration Process................................................................... 1-10
1-17. Establishing Traceability ................................................................. 1-10
1-18. Calibration Reports.......................................................................... 1-10
1-19. Calibration Check................................................................................. 1-11
1-20. Developing a Performance History...................................................... 1-11
1-21. Range Calibration ................................................................................ 1-11
1-22. DC Zeros Calibration ........................................................................... 1-11
1-23. Specifications....................................................................................... 1-12
1-24. Specification Confidence Levels ..................................................... 1-12
1-25. Using Absolute and Relative Uncertainty Specifications................ 1-12
1-26. Using Secondary Performance Specifications................................. 1-12
1-27. DC Voltage Specifications................................................................... 1-13
1-28. AC Voltage Specifications................................................................... 1-16
1-29. Resistance Specifications..................................................................... 1-22
1-1
5700A/5720A Series II
Operators Manual
1-30. DC Current Specifications ................................................................... 1-26
1-31. AC Current Specifications ................................................................... 1-29
1-32. Wideband AC Voltage (Option 5700-03) Specifications .................... 1-34
1-33. General Specifications.......................................................................... 1-35
1-34. Auxiliary Amplifier Specifications...................................................... 1-36
1-2
1-1. Introduction
The Fluke Model 5700A/5720A Series II Calibrators are precise instruments that
calibrate a wide variety of electrical measuring instruments. These calibrators maintain
high accuracy over a wide ambient temperature range, allowing them to test instruments
in any environment, eliminating the restrictions to calibrate only in a temperaturecontrolled standards laboratory. With a 5700A/5720A Series II, you can calibrate
precision multimeters that measure ac or dc voltage, ac or dc current, and resistance. The
5720A Series II operates in a similar manner to the 5700A Series II, the difference is that
the 5720A Series II has a considerably higher specified accuracy. Option 5700A-03
Wideband AC Voltage, which is available for both the 5700A Series II and the 5720A
Series II, extends this workload to include rf voltmeters.
Specifications are provided at the end of this chapter. The calibrator is a fullyprogrammable precision source of the following:
• DC voltage to 1100 V
• AC voltage to 1100 V, with output available from 10 Hz to 1.2 MHz
• AC and DC current to 2.2 A, with output available from 10 Hz to 10 kHz
• Resistance in values of 1x10
Introduction and Specifications
n
and 1.9x10n from 1 Ω to 100 MΩ, plus a short
Introduction
1
• Optional wideband ac voltage from 300 µV to 3.5 V into 50 Ω (-57 dBm to
+24 dBm), 10 Hz to 30 MHz
Features of the calibrator include the following:
• Internal environmentally-controlled references allowing the calibrator to maintain
full performance over a wide ambient temperature range
• Automatic meter error calculation obtained through using a simple output adjust
knob; the display shows linearity, offset, and scale errors
• Keys that multiply and divide the output value by 10 to simplify work on meters
with calibration points at decade multiples of a fraction of full-scale
• Programmable entry limits used for restricting the levels that can be keyed into the
calibrator, preventing access to levels that may be harmful to equipment or personnel
• A s key that provides the capability of displaying the instrument’s specification at
the selected operating point, calibration interval, and specification confidence level
• An auxiliary current binding post that allows you to calibrate meters with separate
current inputs without moving cables
• Real-time clock and calendar for date stamping reports
• Offset and scaling modes that simplify linearity testing of multimeters
• Variable phase reference signal output and phase-lock input
• Interface for the Fluke 5725A Amplifier
• Standard IEEE-488 (GPIB) interface, complying with ANSI/IEEE Standards 488.1-
1987 and 488.2-1987
• Selectable normal remote mode or emulation of the Fluke 5100B and 5200A Series
calibrators in functions and response to system controller software
• EIA Standard RS-232C serial data interface for printing, displaying, or transferring
internally-stored calibration constants, and for remote control of the calibrator
• Extensive internal self-testing and diagnostics of analog and digital functions
1-3
5700A/5720A Series II
Operators Manual
• A traceable calibration procedure for all modes and ranges that requires only 10 V,
• Fast, simple, automated calibration check providing added confidence between
1-2. Instruction Manuals
The 5700A/5720A Series II Calibrators ship with a complete manual set that contains
information for the operator and service or maintenance technicians. The set includes:
• 5700A/5720A Series II Getting Started Manual (PN 1668111)
• 5700A/5720A Series II Operator Reference Guide (PN 601648)
• 5700A/5720A Series II Remote Programming Reference Guide (PN 601655)
• 5700A/5720A Series II Operator Manual (provided on CD-ROM, PN 1668127, or a
1 Ω, and 10 kΩ external standards, with only occasional independent verification
calibration recalls, and data that can be used to document and characterize the
calibrator’s performance between calibration recalls
printed copy is available for purchase through the Fluke Service Department under
PN 601622)
• 5700A/5720A Series II Service Manual (provided on CD-ROM, PN 1668127, or a
printed copy is available for purchase through the Fluke Service Department under
PN 105798)
Order additional copies of these instruction manuals separately using the part numbers
provided. For ordering instructions, refer to the Fluke Catalog or contact a Fluke sales
representative.
1-3. About this Manual
This manual provides complete information for installing the calibrator and operating it
from the front panel keys and in remote. It also provides a glossary of calibration-related
terms as well as general items such as specifications and error code information. The
following topics are covered in this manual:
• Installation
• Operating controls and features
• Front panel operation
• Remote operation (IEEE-488 bus or serial port remote control)
• Serial port operation (printing, displaying, or transferring data, and setting up for
serial port remote control)
• Operator maintenance, including how to calibrate the 5700A/5720A Series II
Calibrator
1-4
• Options and accessories
1-4. How to Use this Manual
Use the following list to find the location of specific information.
• Unpacking and setup: Chapter 2
• Installation and rack mounting: Chapter 2; also the rack mount kit instruction sheet
• AC line power and interface cabling: Chapter 2
• Controls, indicators, and displays: Chapter 3
• Front panel operation: Chapter 4
• Cabling to a UUT (Unit Under Test): Chapter 4
• Using auxiliary amplifiers: Chapter 4
• Self calibration: Chapters 1 and 7
• Remote operation (IEEE-488 or serial): Chapter 5
• Options and accessories: Chapters 2 and 8
• Instrument specifications: The end of this Chapter
Introduction and Specifications
How to Use this Manual
1
1-5. Wideband AC Voltage Module (Option 5700A-03)
The Wideband AC Voltage Module (Option 5700A-03) can be installed in both the
5700A and 5720A Series II Calibrators. The module is a high-accuracy, low-noise,
extremely flat ac voltage source for calibrating rf voltmeters, with a frequency range of
10 Hz to 30 MHz. Output is in seven ranges from 300 µV (-57 dBm) to 3.5 V (+24 dBm)
through a Type-N coaxial connector into a 50 Ω load. The output level is selected in
volts or dBm through either the front panel controls or under remote control.
The wideband module also functions with the calibrator’s output adjust controls that let
display the error of a wideband meter in either percentage of output or in decibels.
Included with the wideband module is a Type-N output cable and a 50 Ω terminator. The
wideband module is calibrated to the end of its standard-equipment output cable.
1-6. Auxiliary Amplifier
The Fluke Model 5725A Amplifier is available to extend the high voltage performance
and current range of the calibrator:
Interface connectors on the calibrator’s rear panel accept cables to directly operate a
5725A. Three amplifiers can be connected to the calibrator at the same time, but only
one output can be active at a time. Once you have connected the amplifiers and
configured the calibrator in a setup menu, amplifier operation is controlled by the
calibrator.
Chapter 4 provides instructions for operating the 5725A. The general specifications at
the end of this chapter include specifications for operating the calibrator with the 5725A.
For other amplifier specifications, refer to their instruction manuals. Table 1-1
summarizes the extended capabilities offered by the 5725A. Brief descriptions of the
extended capabilities follow.
1-5
5700A/5720A Series II
Operators Manual
Model Mode Range
5725A Amplifier AC V 20 to 1100 V rms up to 70 mA, 40 Hz to 30 kHz
1-7. 5725A Amplifier
The Fluke 5725A Amplifier is an external unit operating under calibrator control to
extend ac voltage drive capabilities and both ac and dc current output range. The
amplifier adds the following capabilities to the calibrator’s 1100 V AC range with no
compromise in accuracy:
• Frequency limits at higher voltage increase to 100 kHz at 750 V, 30 kHz at 1100 V.
• Load limit increases to 70 mA for frequencies above 5 kHz.
Table 1-1. Auxiliary Amplifier Data
(50 mA < 5 kHz)
220 to 750 V rms up to 70 mA, 30 kHz to 100 kHz
DC Amps 0 to ±11 A
DC Amps 1 to 11 A rms, 40 Hz to 10 kHz
• Capacitive drive increases to 1000 pF, subject to the maximum output current.
Extended-performance voltage is available at the calibrator’s front or rear binding posts,
eliminating the need to change cables during a procedure.
A separate set of binding posts on the front panel of the 5725A supplies extended-range
ac and dc current outputs. Since most meters have a separate input terminal for the high
current ranges, this eliminates the need to change cables during a procedure. The 5725A
can also be configured to source all current (both standard calibrator-generated current
and its own current) through the 5725A binding posts.
1-8. Support Equipment and Services
Fluke supports your calibration needs with precision, high-quality equipment and a wide
range of services. Depending on your needs, location, and capabilities, you may decide
to support your 5700A/5720A Series II Calibrator independently or use Fluke services
for part, or all, of your support needs. The following paragraphs describe the support
equipment and services offered by Fluke for the calibrator. For specifications and
ordering instructions for this support equipment and other Fluke instruments, refer to the
Fluke catalog, or contact a representative at a Fluke Sales and Service Center.
1-9. 732B Direct Voltage Reference Standard
The Fluke 732B is a rugged, easily transported solid state direct voltage reference
standard with a highly predictable 10 V output. This predictability allows the Fluke
Standards Laboratory, as well as many Fluke customers, to completely eliminate fragile,
saturated standard cells. Laboratories still maintain standard cells using the 732A and
732B as a transportable voltage standard, eliminating the need to transport their standard
cells. The 732B can be short-circuited, even for extended periods of time, without
damage or loss of stability. It maintains full specified stability over a temperature span
of 18 to 28 °C.
1-6
The calibrator uses a 10 V reference standard such as the Fluke 732B in its semiautomated calibration procedure to establish external voltage traceability. Chapter 7
describes this procedure.
Introduction and Specifications
Support Equipment and Services
1-10. 732B-200 Direct Volt Maintenance Program (U.S.A. Only)
The Fluke 732B-200 Direct Volt Maintenance Program provides your laboratory with
NIST-traceable 10 V calibration uncertainty as low as 0.6 parts per million.
The program maintains the 732B that you keep in your laboratory. To accomplish this,
the following occurs:
1. Fluke sends you a calibrated Fluke-owned 732B standard, together with all-
necessary connecting cables and instructions for comparison with your 10 V
reference standard.
2. You take a series of readings over a five-day period, and return the results to the
Fluke Standards Laboratory.
3. The Fluke Standards Laboratory assigns a value to your 10 V standard relative to the
NIST legal volt and sends you a report of calibration.
1-11. 742A Series Resistance Standards
The calibrator uses 1 Ω and 10 kΩ resistor standards such as the 742A Series in its semiautomated calibration procedure to establish external traceability of resistance and
current. Chapter 7 describes this procedure.
1
The 742A Resistance Standards, which are constructed of arrays of Fluke wirewound
precision resistors, are ideally suited as support standards for the calibrator. Stability of
the resistance transfer standards and their temperature coefficients make them ideal for
easy transport to and operation in the calibrator’s working environment.
1-12. Wideband AC Module (Option 5700A-03) Calibration Support
The Wideband AC Module (Option 5700A-03) requires two kinds of calibration: gain
and flatness. Gain constants are checked and recalibrated as a part of the normal
calibrator semi-automated calibration process.
Since frequency flatness is determined by such stable parameters as circuit geometry and
dielectric constants, flatness of the Wideband AC module has excellent long-term
stability. This stability gives the Wideband AC Module a two-year calibration cycle for
flatness calibration. Flatness calibration is required only infrequently, and can be done
when the calibrator is returned to a standards laboratory for periodic verification. The
5700A/5720A Series II Service Manual contains the wideband flatness calibration
procedure. Chapter 7 of this manual contains the wideband gain calibration procedure.
1-13. Service Centers
A worldwide network of Fluke service centers supports Fluke instruments and assists
customers in many ways. Most service centers have standards and calibration
laboratories certified by local national standards organizations. The following is a partial
list of the services provided by most service centers:
• Repair and certified traceable calibration of all Fluke products.
• Certified traceable calibration of many non-Fluke standards and calibrators.
• Worldwide exchange of calibrator internal modules. Delivery inside the U.S.A. is
typically within 48 hours.
1-7
5700A/5720A Series II
Operators Manual
• Service agreements with the flexibility to suit your needs. These can be a simple
• Training programs and seminars, including laboratory metrology, system
• Application help and consulting, including system design, hardware selection,
• Replacement parts inventory, including recommended spare parts and module kits.
Visit www.fluke.com for locations and phone numbers of authorized Fluke service
centers.
1-14. The Components of the 5700A/5720A Series II Calibrator
The calibrator is configured internally as an automated calibration system, with process
controls and consistent procedures. Internal microprocessors control all functions and
monitor performance, using a switching matrix to route signals between modules.
Complete automatic internal diagnostics, both analog and digital, confirm operational
integrity.
warranty extension or an agreement that includes on-site support. Calibration service
agreements are also available in many areas.
applications, and product maintenance.
custom software, site evaluation and installation.
Reference amplifiers maintain dc accuracy and stability. Of all technologies available,
reference amplifiers have the lowest noise and best stability. Reference amplifiers in the
calibrator go through special selection processes including long-term aging to ensure
high reliability and performance well within specifications.
The calibrator achieves its exceptional ac voltage accuracy by using a patented Fluke
rms sensor to make real-time AC/DC comparison measurements. The Fluke rms sensor
is similar in principle to the traditional thermal voltage converter, but has a shorter time
constant, virtually no reversal error, higher signal-to-noise ratio, and better frequency
response. In the calibrator, one Fluke rms sensor serves as an AC/DC transfer standard to
develop gain and flatness correction constants during calibration. The second Fluke rms
sensor continuously monitors and corrects output voltage during operation.
A patented 26-bit digital-to-analog converter (dac) provides the calibrator with the
ability to precisely vary its output. This is a pulse-width-modulated dac with linearity
typically better than 0.2 ppm of full scale. As with the other internal functions, the
linearity of the dac is automatically checked during calibration and analog diagnostics.
1-15. Calibrating the 5700A/5720A Series II Calibrator
The traditional practice of returning a calibrator to a standards laboratory at regular
intervals for a full calibration is time consuming, expensive, and disruptive to the task to
which the calibrator is being applied. Moreover, it leaves gaps in confidence. You must
rely on manufacturer’s specifications to determine if a calibrator will perform acceptably
in an operating environment outside the lab. Also, you must assume that drift is
predictable enough so that performance is within limits between recalls.
1-8
The 5700A/5720A Series II Calibrator makes use of Fluke design breakthroughs in the
use of internal check standards and measurement systems. As a result, it can be
completely calibrated in place to full specifications using a small number of convenient,
portable, environmentally tolerant standards available from Fluke. As you will see
below, this procedure is traceable to military standard requirements.
Introduction and Specifications
Calibrating the 5700A/5720A Series II Calibrator
When manufactured, each calibrator is calibrated and thoroughly verified with process
metrology and calibration standards traceable to the U.S. National Bureau of Standards.
A certificate of calibration is included.
A calibration verification procedure described in the 5700A/5720A Series II Service
Manual is recommended every two years or as required by your established policies.
This procedure involves no adjustments. It simply ensures internal processes are in
control, and establishes parallel external traceability paths for internal functions such as
ac transfers that are never adjusted or corrected.
Figure 1-1 illustrates the time and money that can be saved by using the 5700A/5720A
Series II calibration support plan recommended by Fluke. Depending on your policies,
you may initially decide to perform calibration verification more often. The calibrator
makes this unnecessary and offers you a practical way to collect data unavailable with a
traditional calibrator design about performance between calibrations.
TRADITIONAL CALIBRATOR CALIBRATION
CALIBRATION CYCLE
1
COST $
COST $
TIME
5700A/5720A SERIES II CALIBRATION
CALIBRATION CYCLE
TIME
Figure 1-1. Time and Costs: Calibrator Calibration
1-9
5700A/5720A Series II
Operators Manual
1-16. The Calibration Process
Calibration requires only three external standards: 10 V, 1 Ω, and 10 kΩ.
Environmentally-controlled internal check standards provide the primary reference
points. A stored table of calibration constants defines additional reference points for
controlling the output. Traceable calibration and adjustment to the specified level of
performance is accomplished in a semi-automated process that revises this table.
When you finish calibration, but before you save the new constants, the calibrator
presents you with the proposed adjustments as +/- ppm of range and percentage change
in specification for each range and function. You can print a list of changes through the
serial (RS-232C) port, or send them to a computer through either the serial port or the
IEEE-488 port. Also on completion of calibration, the calibrator displays the largest
proposed change.
Calibration can be completed as far as deriving and printing the proposed adjustments
without changing the setting of the rear panel CALIBRATION switch; however, the
switch must be set to ENABLE to store the changes in nonvolatile memory and make
them effective. The switch is recessed to allow the metrologist to cover it with a
calibration sticker to guarantee calibrator integrity.
1-17. Establishing Traceability
Traceability to national standards is established as follows:
• Except for the internal AC/DC transfer standard, the internal check standards are
directly calibrated by traceable external standards every time the 5700A/5720A
Series II is calibrated.
• The internal AC/DC transfer standard is never adjusted, so its traceability is not
disturbed by calibration. Infrequent verification is done in the traditional way, by
comparing selected ac voltage outputs with an external dc voltage standard through
an external ac/dc transfer standard. Fluke recommends this is done every two years
or as determined by the policy of your organization.
• Infrequent independent verification is also performed on stable parameters, such as
frequency flatness, determined more by circuit geometry and dielectric constants
than time.
1-18. Calibration Reports
The calibrator stores two sets of calibration constants: the set currently in use and the old
set from the previous calibration. This gives the calibrator the ability at any time to
produce a calibration report of the differences between the present settings and the
settings that were in effect before the last calibration. The report shows changes for each
range and function in +/- ppm of range and in percentage of specification limit. You can
print the report or send it to a host computer through either the RS-232-C or IEEE-488
interface.
1-10
If you request a calibration report after doing calibration but before saving the new
constants, the report shows proposed changes to the calibration constants relative to the
previously stored settings.
1-19. Calibration Check
Checking the calibration takes about an hour, and provides you with a means of
documenting the calibrator’s performance of a between calibrations. Calibration
checking is similar to calibration, except internal check standards are used as primary
references (no external standards are needed), and changes cannot be stored. The process
produces a report similar to normal calibration, showing drift relative to internal check
standards. Because cal check does not change stored calibration constants, there is no
need to enable the rear panel CALIBRATION switch. Therefore, an external computer
can do the procedure unattended.
1-20. Developing a Performance History
A Fluke specification is a set of performance limits that all products must meet. To
maintain consistent quality, Fluke calibrators are specified with enough margin to
include temperature, line, and load extremes, plus additional margin for production. This
means that a typical 5700A/5720A Series II calibrator in a typical environment operates
inside 50 % of specification limits. For some exacting applications, it can be helpful to
know just how accurately a particular calibrator operates. The proper way to do this is to
accumulate a performance history by calibrating regularly and recording results on a
control chart.
Introduction and Specifications
Calibration Check
1
Calibrating regularly and recording the results on a control chart is tedious and requires a
large array of equipment. The calibrator’s calibration check feature is an alternative with
some distinct advantages:
• Calibrated check standards are already programmed into the unit. You do not have to
use external standards.
• The process is consistent and automatic: it does not require an operator’s assistance.
Each calibration check produces a new set of data points for accumulating a historical
record. When this process is externally automated, significant history can be
accumulated much faster than with a manual calibration.
1-21. Range Calibration
After calibration, you can make further fine adjustments to each range. Range
adjustments are optional; they are not necessary to meet total uncertainty specifications.
However, they do allow you to align your calibrator closer to your standards.
Before you do range calibration, you must first use the calibrator’s semi-automated
calibration procedure. This is to calibrate the ranges that will not be adjusted. It also
performs an initial adjustment for each range, and supplies flatness corrections for ac
functions.
1-22. DC Zeros Calibration
To ensure the validity of the specifications, a dc zeros calibration must be performed at
least every 30 days. If more than 30 days elapse without a dc zeros calibration a warning
message appears. This procedure does not require any external equipment or connections
and takes approximately 2.5 minutes to complete.
1-11
5700A/5720A Series II
Operators Manual
1-23. Specifications
The 5700A/5720A Series II Calibrators are verified and calibrated at the factory prior to
shipment to ensure they meet the accuracy standards required for all certified calibration
laboratories. By calibrating to the specifications in this chapter, you can maintain the
high performance level throughout the life of your calibrator.
Specifications are valid after a warm-up period of twice the time the calibrator has been
turned off, up to a maximum of 30 minutes. For example, if the calibrator has been
turned off for five minutes, the warm-up period is ten minutes.
1-24. Specification Confidence Levels
You calibrator’s performance level is ensured by regular calibration to the primary
performance specifications, which are provided at both the 99 % and 95 % confidence
levels. The 95 % confidence level will provide an accuracy that will often surpass the
accuracy requirements for meeting Tag 4 standards, or a coverage factor of 2.
Calibration at the 99 % confidence level is also available for those applications that
require a confidence factor for the specifications that is higher than 95 %. For
information on selecting the confidence level, refer to Chapter 4.
The tables in this chapter provide specifications at both the 95 % and 99 % confidence
levels for the 5700A/5720A Series II Calibrators. Included with these tables are
operating specifications for using the calibrator with the Wideband AC Module (Option
5700A-03) and the 5725A Amplifier.
1-25. Using Absolute and Relative Uncertainty Specifications
To evaluate the 5700A/5720A Series II coverage of your calibration workload, use the
Absolute Uncertainty specifications. Absolute uncertainty includes stability, temperature
coefficient, linearity, line and load regulation, and the traceability to external standards.
You do not need to add anything to absolute uncertainty to determine the ratios between
the calibrator’s uncertainties and the uncertainties of your calibration workload.
Relative uncertainty specifications are provided for enhanced accuracy applications.
These specifications apply when range constants are adjusted (see “Range Calibration”).
To calculate absolute uncertainty, you must combine the uncertainties of your external
standards and techniques with relative uncertainty.
1-26. Using Secondary Performance Specifications
Secondary performance specifications and operating characteristics are included in
uncertainty specifications. They are provided for special calibration requirements such as
stability or linearity testing.
1-12
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