FLUKE 57lfc 电路图.pdf

57LFC/AN System Calibrator Service Manual March 2004 2004 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 AND 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 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 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 only 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. Flukes warranty obligation is limited, 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 authorization 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 Destination). 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 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 BUYERS 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, 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. 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 Corporation P.O. Box 9090 Everett, WA 98206-9090 U.S.A. Fluke Europe B.V. P.O. Box 1186 5602 BD Eindhoven The Netherlands 11/99 To register your product online, visit RadioFans.CN 收音机爱 好者资料库 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. Interference Information This equipment generates and uses radio 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 A 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. RadioFans.CN 收音机爱 好者资料库 OPERATOR SAFETY SUMMARY XWXWWARNING 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 2200 V 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 Chapter 1 of this 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. XWWARNING statements identify conditions or practices that could result in personal injury or loss of life. XWCAUTION statements identify conditions or practices that could result in damage to the equipment or other property. Symbols Marked on Equipment X Caution, risk of electric shock. . Protective ground (earth) terminal. Q Q Functional earth terminal. W Caution, risk of danger. Refer to the manual to maintain the safety provided by the equipment. XWXWWarning Do not operate this calibrator in a position where it is difficult to operate the power switch. Do not operate this calibrator in a manner not specified in the manual or the protection provided by the equipment may be impaired. Do not operate the calibrator if it shows signs of damage or malfunction, the protection provided by the equipment may be impaired. Do not use hook-up wire on the calibrator with an insulation or current rating of less than the calibrator output. Power Source The 57LFC is intended to operate from a power source that will not apply more than 246 V 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 57LFC The 57LFC is Safety Class I (grounded enclosure) instruments as defined in IEC 61010 2nd Edition. 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 57LFC 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 57LFC. Use only a power cord that is in good condition. Refer cord and connector changes to qualified service personnel. Do Not Operate in Explosive Atmospheres To avoid explosion, do not operate the 57LFC in an atmosphere of explosive gas. Do Not Remove Cover To avoid personal injury, do not remove the cover from the 57LFC. Do not operate the 57LFC without the cover properly installed. There are no user-serviceable parts inside the 57LFC, so there is no need for the operator to ever remove the cover. SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present. Use Care When Servicing With Power On Dangerous voltage exist at many points inside this product. To avoid personal injury, do not touch exposed connections and components while power is on. Whenever the nature of the operation permits, keep one hand away from equipment to reduce the hazard of current flowing through vital organs of the body. Do not wear a grounded wrist strap while working on this product. A grounded wrist strap increase the risk of current flowing through the body. Disconnect power before removing protective panels, soldering, or replacing components. High voltage may still be present even after disconnecting power. 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. If the circuit cannot be broken or grounded, use a board, dry clothing, or other nonconductor to free the victim. Get Help! Yell 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 severe burns. Treat the Victim If the victim is not breathing, begin CPR or mouth-to-mouth resuscitation if you are certified. i Table of Contents Chapter Title Page 1 Introduction and Specifications. 1-1 Introduction. 1-3 Service Information. 1-3 Accessories. 1-4 Low Thermal EMF Test Leads. 1-4 Rack Mount Kit. 1-4 Shielded IEEE-488 Cables (Y8021, Y8022, and Y8023). 1-4 Contacting Fluke. 1-5 Specifications. 1-6 General Specifications. 1-6 Accuracy Specifications. 1-7 DC Voltage Accuracy. 1-7 DC Current Accuracy. 1-7 Resistance Accuracy. 1-7 AC Voltage Accuracy. 1-8 AC Voltage Distortion. 1-9 AC Current Accuracy. 1-10 AC Current Distortion. 1-11 2 Theory of Operation. 2-1 Introduction. 2-3 A1 LED PCA. 2-5 A3 Motherboard PCA. 2-5 Relay Control and Switch Matrix. 2-5 LED Control and Output Cables . 2-10 Signal Buses. 2-10 Low Volt Buffer. 2-10 In-guard Power Supplies. 2-10 Outguard Power Supplies. 2-11 Miscellaneous Circuits. 2-11 Troubleshooting Test Points. 2-12 List of Fuses . 2-13 A5 Ohms PCA. 2-13 Precision Resistor Networks. 2-14 57LFC/AN Service Manual ii Relay Switch Matrix and Con