FLUKE 268xa 电路图.pdf

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1、 268XA Data Acquisition System/Data Logging System Service Manual PN 1883791 November 2002 2002 Fluke Corporation. All rights reserved. Printed in USA All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 Limited Warranty and Limitation of Liability Each Fluke produ

2、ct 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 o

3、f a Fluke authorized reseller, and does not apply to fuses, disposable batteries or to any product which, in Flukes opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substanti

4、ally 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. The software is neither intended nor warranted for use in medical or any other app

5、lications where human safety may be a concern. 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 only if product is purchased th

6、rough 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. Flukes warranty obligation is limi

7、ted, at Flukes 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 to obtain return au

8、thorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Des

9、tination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident or abnormal condition of operation or handling, including overvoltage failures caused by use outside the products specified rating, or normal wear and tear of mechanical components, Fluke w

10、ill 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 BUYERS

11、SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 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 OR LOSSES AND/OR PR

12、OFITS, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR 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.

13、 If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision. Fluke CorporationFluke Europe B.V. P.O. Box 9090P.O. Box 1186 Everett, WA 98206-909056

14、02 BD Eindhoven U.S.A.The Netherlands 2/02 RadioFans.CN 收音机爱 好者资料库 WCaution This is an IEC safety Class 1 product. Before using, the ground wire in the line cord or rear panel binding post must be connect to an earth ground for safety. Interference Information This equipment generates and uses radio

15、 frequency energy and if not installed and used in strict accordance with the manufacturers 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 of Part

16、 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. Operation is subject to the following two conditions: This device may not cause harmful interference. This device must accept any interference received, including interferen

17、ce that may cause undesired operation. 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 correc

18、t 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 n

19、ecessary, 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 availa

20、ble from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4. SAFETY TERMS IN THIS MANUAL This device has been designed and tested to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It i

21、s an Installation Category II device intended for operation from a normal single phase supply. The DIO relay controls are rated to 250 V ac CAT I and should not be used in applications that exceed that rating. This Users Manual contains information, warnings and cautions. Use of this equipment in a

22、manner not specified herein may impair the protection provided by the equipment. Measurement category I is for measurements performed on circuits not directly connected to MAINS. Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits.

23、Measurement category II is for measurements performed on circuits directly connected to the low voltage installation. Examples are measurements on household appliances, portable tools and similar equipment. W WARNING statements identify conditions or practices that could result in personal injury or

24、 loss of life. CAUTION statements identify conditions or practices that could result in damage to equipment. RadioFans.CN 收音机爱 好者资料库 SYMBOLS MARKED ON EQUIPMENT: WARNING Risk of electric shock. Ground (earth) terminal. Protective ground (earth) terminal. Must be connected to safety earth ground when

25、 the power cord is used. Attention. Refer to the manual. This symbol indicates that information about usage of a feature is contained in the manual. This symbol appears on the Universal Input Module and in the following two places on the device rear panel: 1. Ground Binding Post (to the left of the

26、line power connector). 2. Alarm/Trigger I/O and Digital I/O connectors. AC POWER SOURCE The device is intended to operate from an ac power source that will not apply more than 264 V ac rms between the supply conductors or between either supply conductor and ground. A protective ground connection by

27、way of the grounding conductor in the power cord is required for safe operation. XWWARNING Use the proper fuse. To avoid fire hazard, for fuse replacement use only a 1/2 ampere, 250 V time delay line fuse. DC POWER SOURCE The device may also be operated from a 9 V to 45 V dc power source when either

28、 the rear panel ground binding post or the power cord grounding conductor is connected properly. The input is protected by a 4 ampere fuse internal to the device. This fuse should only be replaced by a qualified Fluke technician. GROUNDING THE DEVICE The device utilizes controlled overvoltage techni

29、ques that require the device to be grounded whenever normal mode or common mode ac voltages or transient voltages may occur. The enclosure must be grounded through the grounding conductor of the power cord, or if operated on battery with the power cord unplugged, through the rear panel ground bindin

30、g post. USE THE PROPER POWER CORD Use only the power cord and connector appropriate for the voltage and plug configuration in your country. Use only a power cord that is in good condition. Refer power cord and connector changes to qualified service personnel. XWWARNING To avoid possible electric sho

31、ck or damage to the device: Read manual before operating. Do not position device so that air flow through side vents is restricted. Do not use in a manner not specified in this manual or safety protection may be impaired. Disconnect power cord and ALL other inputs before replacing a fuse. Position t

32、he device where power cord can be disconnected. Do not exceed maximum voltages. XWWARNING DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES To avoid personal injury or death, do not remove the device cover without first removing the power source connected to the rear panel. Do not operate the device without t

33、he cover properly installed. There is no need for the operator to remove the cover. DO NOT ATTEMPT TO OPERATE IF PROTECTION MAY BE IMPAIRED If the device appears damaged or operates abnormally, protection may be impaired. Do not attempt to operate the device under these conditions. Refer all questio

34、n of proper device operation to qualified service personnel. DO NOT ATTEMPT TO SERVICE UNLESS YOU ARE A FLUKE QUALIFIED REPAIR TECHNICIAN To avoid personal injury or death, remove the AC power cord and all analog and digital connector modules before servicing the device. Note All signals must be rem

35、oved from the analog and digital connector wiring before opening the connector modules. i Table of Contents ChapterTitlePage 1Introduction and Specifications. 1-1 Introduction. 1-3 Block Diagrams. 1-5 Specifications . 1-7 2680A/2686A Combined Specifications. 1-7 2680A/2686A General Specifications. 1

36、-8 Real-Time Clock and Calendar . 1-9 Trigger In Specifications. 1-9 Trigger Out Specifications . 1-9 Master Alarm Output Specification. 1-10 Communication I/O. 1-10 2686A PC Card Storage . 1-10 Precision Analog Input (PAI) A/D Specifications. 1-11 Specifications PAI A/D DC Voltage Measurement. 1-11

37、 PAI A/D AC Voltage Measurement Specifications. 1-13 PAI A/D 4-Wire Resistance Measurement Specifications. 1-15 PAI A/D 2-Wire Resistance Measurement Specifications. 1-16 PAI A/D 4-Wire RTD per ITS-1990 Measurement Specifications . 1-16 PAI A/D 2-Wire RTD per ITS-1990 Measurement Specifications . 1-

38、16 PAI A/D Thermocouple per ITS-1990 Measurement Specifications. 1-17 PAI A/D Frequency Measurement Specifications. 1-20 Fast Analog Input (FAI) A/D Specifications. 1-21 FAI A/D DC Voltage Measurement Specifications. 1-21 FAI A/D AC Voltage Measurement Specifications. 1-22 FAI A/D 4-Wire Resistance

39、Measurement Specifications. 1-24 FAI A/D 2-Wire Resistance Measurement Specifications. 1-25 FAI A/D 4-Wire RTD per ITS-1990 Measurement Specifications . 1-25 FAI A/D Thermocouple per ITS-1990 Measurement Specifications. 1-26 FAI A/D Frequency Measurement Specifications. 1-28 Digital Input/Output Mod

40、ule. 1-29 Digital Input/Output Specifications . 1-29 Totalizer Input Specifications. 1-30 Digital Relay Specifications. 1-30 Options and Accessories. 1-31 268XA Service Manual ii 2Theory of Operation. 2-1 Introduction. 2-3 Main Power Supply. 2-5 Secondary Supplies. 2-5 Out-Guard Overview. 2-5 Microprocessor. 2-6 FPGA. 2-7 Other Bus Devices. 2-8 Serial Devices. 2-9 Trigger In/Out, Master Alarm. 2-9 PCMCIA Interface PCA (2686A-4041). 2-10 Backplane PCA (268XA-4001). 2-10 Display Interface.