FLUKE 5700a___smeng0000 电路图.pdf

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1、 5700A/5720A Series II Multi-Function Calibrator Service Manual November 2007 2007 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY the display shows linearity, offset, and scale errors. Keys that multipl

2、y 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 per

3、sonnel. A s key that provides the capability of displaying the instruments 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

4、. 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 5725 Amplifier. Standard IEEE-488 (GPIB) interface, complying with ANSI/IEEE Standar

5、ds 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 constan

6、ts, and for remote control of the calibrator. Extensive internal self testing and diagnostics of analog and digital functions. 5700A/5720A Series II Calibrator Service Manual 1-4 A traceable calibration procedure for all modes and ranges that requires only 10V, 1, and 10 k external standards, with o

7、nly occasional independent verification. Fast, simple, automated calibration check providing added confidence between calibration recalls, and data that can be used to document and characterize the calibrators performance between calibration recalls. 1-2. Contacting Fluke To order accessories, recei

8、ve operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: USA: 1-888-44-FLUKE (1-888-443-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31 402-675-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500 Or, visit

9、Flukes Web site at . 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 inform

10、ation. 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) O

11、perator maintenance, including how to calibrate the 5700A/5720A Series II Options and accessories 1-4. How to Use this Manual Use the following list to find the location of specific information. Quick setup procedure: 5700A/5720A Series II Operators Reference Guide Unpacking and setup: Chapter 2. In

12、stallation 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 ca

13、libration: Chapters 1 and 7 Introduction and Specifications Wideband AC Voltage Module (Option 5700A-03) 1 1-5 Remote operation (IEEE-488 or serial): Chapter 5 Options and accessories: Chapters 2 and 8 Instrument specifications: The end of this Chapter Theory of operation: Chapter 2 of the 5700A/572

14、0A Series II Service Manual 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,

15、 with a frequency range of 10 Hz to 30 MHz. Output is in seven ranges from 300 V (-57 dBm) to 3.5 V (+24 dBm) through a Type-N coaxial connector into a 50 load. The output level is selected in volts or dBm through either the front panel controls or under remote control. The wideband module also func

16、tions with the calibrators 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 terminator. The wideband module is calibrated to the end of its standard-equipment outpu

17、t cable. 5700A/5720A Series II Calibrator Service Manual 1-6 1-6. Auxiliary Amplifiers The Fluke Model 5725A Amplifier is available to extend the high voltage performance and current range of the calibrator: Interface connectors on the calibrators rear panel accept cables to directly operate a 5725A

18、. 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 operatin

19、g 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 th

20、e extended capabilities follow. Table 1-1. Auxiliary Amplifier Data Model Mode Range 5725A Amplifier AC V 220 to 1100V rms up to 70 mA, 40 Hz to 30 kHz (50 mA 5 kHz) 220 to 750V rms up to 70 mA, 30 kHz to 100 kHz DC Amps 0 to 11A AC Amps 1 to 11A rms, 40 Hz to 10 kHz 1-7. 5725A Amplifier The Fluke 5

21、725A 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 calibrators 1100V ac range with no compromise in accuracy: Frequency limits at higher voltage in

22、crease to 100 kHz at 750V, 30 kHz at 1100V. 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 calibrators front or rear binding posts, eliminating the need to chang

23、e 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 al

24、so 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 ne

25、eds, 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 a

26、nd 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. Introduction and Specifications Support Equipment and Services 1 1-7 1-9. 732B Direct Voltage Reference Standard The Fluke 732

27、B is a rugged, easily transported solid state direct voltage reference standard with a highly predictable 10V output. This predictability allows the Fluke Standards Laboratory, as well as many Fluke customers, to completely eliminate fragile, saturated standard cells. Laboratories still maintain sta

28、ndard 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 1

29、8 to 28 C. The calibrator uses a 10V reference standard such as the Fluke 732B in its semi- automated calibration procedure to establish external voltage traceability. Chapter 7 describes this procedure. 1-10. 732B-200 Direct Volt Maintenance Program (U.S.A. Only) The Fluke 732B-200 Direct Volt Main

30、tenance Program provides your laboratory with NIST-traceable 10V 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 wit

31、h all necessary connecting cables and instructions for comparison with your 10V 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 10V standard relative to th

32、e NIST legal volt and sends you a report of calibration. 1-11. 742A Series Resistance Standards The calibrator uses 1 and 10 k resistor standards such as the 742A Series in its semi- automated calibration procedure to establish external traceability of resistance and current. Chapter 7 describes thi

33、s procedure. 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

34、operation in the calibrators 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-automate

35、d 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 calibratio

36、n. 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 ga

37、in calibration procedure. 5700A/5720A Series II Calibrator Service Manual 1-8 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

38、 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

39、. 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 semina

40、rs, 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 for

41、 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 a

42、nd 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 lo

43、west 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 sens

44、or 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 s

45、ensor 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 abilit

46、y 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

47、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 Introduction and Specifications Calibrating the 5700A/5720A Series II Calibrator 1 1-9 which the calibrat

48、or is being applied. Moreover, it leaves gaps in confidence. You must rely on manufacturers 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 bet

49、ween 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 requ