Fluke 5700A, 5720A Getting Started
5700A/5720A Series II
®
Multi-Function Calibrator
Getting Started
PN 1668111
March 2002
© 2002 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of thei r r espective c omp ani es.
LIMITED WARRANTY & LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from 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 batteries 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 warrants that 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 warrant 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 to extend a greater or different warranty
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 importation costs of repair/replacement parts
when product purchased in one country is submitted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price,
free of charge repair, or replacement of a defective product which is returned to a Fluke
authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center or send
the product, with a description of the difficulty, postage and insurance prepaid (FOB
Destination), to the nearest Fluke authorized service center. Fluke assumes no risk for
damage in transit. Following warranty repair, the product will be returned to Buyer,
transportation prepaid (FOB Destination). If Fluke determines that the failure was
caused by misuse, alteration, accident or abnormal condition of operation or handling,
Fluke will provide an estimate of repair costs and obtain authorization before
commencing the work. Following repair, the product will be returned to the Buyer
transportation prepaid and the Buyer will be billed for the repair and return transportation
charges (FOB Shipping Point).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMI TED
TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES O R LOSSES, INCLUDING
LOSS OF DATA, WHETHER ARISING FROM BREACH OF WARRANTY OR BASED
ON CONTRACT, TORT, RELIANCE OR ANY OTHER THEORY.
Since some countries or states do not allow limitation 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 competent jurisdiction, such
holding will not affect the validity or enforceability 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 purcha ser, 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 Überpr üf ung der Seir e auf Einh alt un g der Be st imm ung en eingeräumt.
Fluke Corporation
Interference Information
This equipment generates and use s radio frequ en cy 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 reasona bl e protec tio n agai ns t su ch inter f eren ce in a res id ent ial in st al lati on.
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 dif ferent
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 Gen eral Specific ations. Thi s manual contains informat ion and warnings which
have to be followed by the user to ensure safe operat ion and to retain the instrument in
safe condition.
WARNING statements ident if y condit ions or pra ctice s that could result in per sonal injur y 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 II
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 24.
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
Title Page
Introduction.......................................................................................................... 1
Instruction Manuals.............................................................................................. 2
Wideband AC Voltage Module (Option 5700A-03)............................................ 3
Auxiliary Amplifier.............................................................................................. 3
5725A Amplifier.............................................................................................. 3
Support Equipment and Services.......................................................................... 4
732B Direct Voltage Reference Standard........................................................ 4
732B-200 Direct Volt Maintenance Program (U.S.A. Only)........................... 4
742A Series Resistance Standards................................................................... 4
Wideband AC Module (Option 5700A-03) Calibration Support..................... 5
Service Centers................................................................................................. 5
The Components of the 5700A/5720A Series II Calibrator................................. 6
Calibrating the 5700A/5720A Series II Calibrator............................................... 6
The Calibration Process................................................................................... 7
Establishing Traceability.................................................................................. 8
Calibration Reports.......................................................................................... 8
Calibration Check................................................................................................. 9
Developing a Performance History ...................................................................... 9
Range Calibration................................................................................................. 9
DC Zeros Calibration ........................................................................................... 9
Specifications ....................................................................................................... 10
Specification Confidence Levels...................................................................... 10
Using Absolute and Relative Uncertainty Specifications................................ 10
Using Secondary Performance Specifications ................................................. 10
DC Voltage Specifications................................................................................... 11
AC Voltage Specifications................................................................................... 14
Resistance Specifications..................................................................................... 20
DC Current Specifications.................................................................................... 24
AC Current Specifications.................................................................................... 27
Wideband AC Voltage (Option 5700-03) Specifications..................................... 32
General Specifications.......................................................................................... 33
Auxiliary Amplifier Specifications ...................................................................... 34
Unpacking and Inspection.................................................................................... 35
Service Information.............................................................................................. 35
Contacting Fluke .................................................................................................. 36
Placement and Rack Mounting............................................................................. 36
i
5700A/5720A Series II
Getting Started
Cooling Considerations........................................................................................ 36
Accessing the Fuse............................................................................................... 37
Selecting Line Voltage......................................................................................... 38
Connecting to Line Power.................................................................................... 40
Connecting a 5725A Amplifier............................................................................ 40
Selecting Output Binding Posts............................................................................ 40
Front Panel Features............................................................................................. 41
Display Screen Saver....................................................................................... 41
Rear Panel Features.............................................................................................. 50
Softkey Menu Tree............................................................................................... 52
ii
List of Tables
Table Title Page
1. Auxiliary Amplifier Data.......................................................................................... 3
2. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels.... 11
3. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels.... 12
4. DC Voltage Secondary Performance Specifications and Operating Characteristics 13
5. 5720A Series II AC Voltage Specifications: 99 % Confidence Level...................... 14
6. 5720A Series II AC Voltage Specifications: 95 % Confidence Level...................... 15
7. 5700A Series II AC Voltage Specifications: 99 % Confidence Level...................... 16
8. 5700A Series II AC Voltage Specifications: 95 % Confidence Level...................... 17
9. AC Voltage Secondary Performance Specifications and Operating Characteristics 18
10. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels...... 20
11. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels...... 21
12. Resistance Secondary Performance Specifications and Operating Characteristics.. 22
13. Current Derating Factors........................................................................................... 23
14. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels .... 24
15. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels .... 25
16. DC Current Secondary Performance Specifications and Operating Characteristics. 26
17. 5720A Series II AC Current Specifications: 99 % Confidence Level...................... 27
18. 5720A Series II AC Current Specifications: 95 % Confidence Level...................... 28
19. 5700A Series II AC Current Specifications: 99 % Confidence Level...................... 29
20. 5700A Series II AC Current Specifications: 95 % Confidence Level...................... 30
21. AC Current Secondary Performance Specifications and Operating Characteristics. 31
22. Wideband AC Voltage (Option 5700-03) Specifications......................................... 32
23. Standard Equipment.................................................................................................. 35
24. Line Power Cord Types Available from Fluke......................................................... 38
25. Front Panel Features................................................................................................. 42
26. Rear Panel Features .................................................................................................. 50
iii
5700A/5720A Series II
Getting Started
iv
List of Figures
Figure Title Page
1. Time and Costs: Calibrator Calibration.................................................................... 7
2. Volt-Hertz Capability................................................................................................ 19
3. Accessing the Fuse.................................................................................................... 37
4. Line Power Cord Types Available from Fluke......................................................... 38
5. Line Power Label and Switch Location.................................................................... 39
6. Front Panel Features................................................................................................. 43
7. Rear Panel Features .................................................................................................. 51
8. Softkey Menu Tree................................................................................................... 53
v
5700A/5720A Series II
Getting Started
vi
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 Ser ies II, you can calibra te
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.
The calibrator is a fully-programmable 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
Getting Started
n
and 1.9x10n from 1 Ω to 100 MΩ, plus a short
• 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 obta ined th rough usin g 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
1
5700A/5720A Series II
Getting Started
• An auxiliary current binding post that allows you to calibrate meters with separate
• 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
• Selectable normal remote mode or emulation of the Fluke 5100B and 5200A Series
• EIA Standard RS-232C serial data interface for printing, displaying, or transferring
• Extensive internal self-testing and diagnostics of analog and digital functions
• A traceable calibration procedure for all modes and ranges that requires only 10 V,
• Fast, simple, automated calibration check providing added confidence between
current inputs without moving cables
488.1-1987 and 488.2-1987
calibrators in functions and response to system controller software
internally-stored calibration constants, and for remote control of the calibrator
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
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 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.
2
Wideband AC Voltage Module (Option 5700A-03)
Wideband AC Voltage Module (Opt ion 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.
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.
Getting Started
Operating instructions for the 5725A are provided in Chapter 4 of the Operators
Manual. The General Specifications include specifications for operating the calibrator
with the 5725A. For other amplifier specifications, refer to their instruction manuals.
Table summarizes the extended capabilities offered by the 5725A. Brief descriptions
of the extended capabilities follow.
Table 1. Auxiliary Amplifier Data
Model Mode Range
5725A Amplifier AC V 20 to 1100 V rms up to 70 mA, 40 Hz to 30 kHz
(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
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.
• 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.
3
5700A/5720A Series II
Getting Started
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.
Support Equipment and Ser vices
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 equi pm ent and othe r Fluke ins tru men ts, re fer
to the Fluke catalog, or contact a representative at a Fluke Sales and Service Center.
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.
The calibrator uses a 10 V reference standard such as the Fluke 732B in its semi-
automated calibration procedure to establish external voltage traceability. Chapter 7 of
the Operators Manual describes this procedure.
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.
742A Series Resistance Standards
The calibrator uses 1 Ω and 10 kΩ resistor standards such as the 742A Series in its
semi-automated calibration procedure to establish external traceability of resistance and
current. Chapter 7 of the Operators Manual describes this procedure.
The 742A Resistance Standards, which are constructed of arrays of Fluke wirewound
precision resistors, are ideally sui ted as suppo rt sta ndard s for the cal ib rat or. Stab il ity of
the resistance transfer standards and their temperature coefficients make them ideal for
easy transport to and operation in the calibrator's working environment.
4
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 the Operators Manual contains the wideband gain calibration
procedure.
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.
Getting Started
Support Equipment and Services
• 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.
• Service agreements with the flexibility to suit your needs. These can be a simple
warranty extension or an agreement that includes on-site support. Calibration
service agreements are also available in many areas.
• Training programs and seminars, including laboratory metrology, system
applications, and product maintenance.
• Application help and consulting, including system design, hardware selection,
custom software, site evaluation and installation.
• Replacement parts inventory, including recommended spare parts and module kits.
Visit www.fluke.com for locations and phone numbers of authorized Fluke service
centers.
5
5700A/5720A Series II
Getting Started
The Components of the 570 0A/5720A Series II Calibr ator
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.
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.
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 outs ide the lab. A lso, you mus t assu me that
drift is predictable enough so that performance is within limits between recalls.
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.
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 exte rna l tra ceab il it y paths for in ter nal fun ct ions such as
ac transfers that are never adjusted or corrected.
Figure 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.
6
TRADITIONAL CALIBRATOR CALIBRATION
CALIBRATION CYCLE
COST $
CALIBRATION CYCLE
Getting Started
Calibrating the 5700A/5720A Series II Calibrator
TIME
5700A/5720A SERIES II CALIBRATION
COST $
Figure 1. Time and Costs: Calibrator Calibration
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 seria l 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.
TIME
alh1.eps
7
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