FLUKE 8508A 电路图.pdf

8508A Reference Multimeter Service Manual September 2004 Rev. 1, 8/08 2004, 2008 Fluke Corporation, All rights reserved. Specifications are subject to change without notice All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 Warranty 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 i Table of Contents Chapter Title Page 1 Introduction and Specifications. 1-1 Introduction. 1-3 Safety Considerations. 1-3 Symbols. 1-5 Service Information . 1-6 How to Contact fluke. 1-6 Specifications. 1-6 General Specifications. 1-7 Maximum Voltage and Current Inputs. 1-8 DC and AC Voltage. 1-8 DC and AC Current. 1-8 Resistance and Temperature . 1-8 DC Voltage. 1-9 DC Current. 1-10 AC Voltage. 1-11 AC Current. 1-13 Resistance. 1-15 Temperature. 1-17 Read Rate and Additional Uncertainty. 1-18 Applying the Specifications. 1-19 Introduction. 1-19 Absolute and Relative Specifications. 1-19 Applying Users Calibration Uncertainties . 1-20 Operating and Calibration Temperature Ranges . 1-20 Applying Temperature Coefficient Specifications. 1-20 Ratio Measurements. 1-21 Additional Errors. 1-21 2 Theory of Operation. 2-1 Introduction. 2-3 Overall Functional Description. 2-3 Main Assemblies. 2-3 Power Supplies. 2-6 RadioFans.CN 收音机爱 好者资料库 8508A Service Manual ii 3 Calibration and Verification. 3-1 Introduction. 3-3 Calibration Overview. 3-3 Calibration Interval and Performance. 3-3 Calibration Points . 3-3 Non-Nominal Values. 3-4 Enabling Access to Calibration Mode . 3-4 Calibration Menus. 3-4 Accessing the Calibration Menus and Calibration Mode. 3-4 Calibration Menu. 3-4 SET VALUE Menu. 3-5 SPOT CAL Menu. 3-6 SPOT (1 to 6) RMS Menus. 3-6 SPOT FREQUENCY (1 to 6) Menu. 3-6 Special Calibration . 3-7 SPCL Menu. 3-7 SER # = Menu. 3-7 Hvlin Menu. 3-8 Non-volatile input offset compensation. 3-8 Routine Calibration. 3-9 Equipment Required for Calibration . 3-10 Preparing for Calibration. 3-10 Interconnections . 3-11 ADC Calibration. 3-14 DC Voltage Calibration. 3-14 AC Voltage Calibration. 3-16 Resistance Calibration. 3-18 DC Current Calibration . 3-25 AC Current Calibration . 3-27 Frequency Calibration. 3-28 Exit From Calibration Mode and Non-Volatile Input Offset Adjustment. 3-29 Cal Due Date Entry and Calibration Mode Disable . 3-30 ACV Spot Frequency Calibration. 3-30 Performance Verification. 3-31 Equipment Requirements . 3-32 Interconnections . 3-32 Applicable Verification Tolerance and Conditions. 3-32 Preparation. 3-33 DC Voltage Checks. 3-33 AC Voltage Checks. 3-35 Resistance Checks. 3-37 DC Current Checks. 3-40 AC Current Checks. 3-41 Frequency Checks . 3-43 4 Maintenance. 4-1 Introduction. 4-3 Access Procedures . 4-3 Before You Start. 4-3 Cabling and Wiring Connections . 4-4 Removing the A1 DC PCA . 4-5 Removing the A2 AC PCA . 4-6 Removing the A3 Ohms PCA . 4-7 Removing the A4 Digital PCA. 4-8 Contents (continued) iii Removing the A5 Bezel Assembly. 4-9 Removing the A5A1 Display PCA. 4-10 Removing the A6 Rear Input Assembly. 4-11 Fuse Replacement and Line-Voltage Selection. 4-12 Line-Power Fuse F1 and Voltage Selection. 4-12 Rear-Input Current Fuse F2 (Rear Inputs Option). 4-13 Self Test. 4-13 Self-Test Errors . 4-13 Fatal Errors. 4-16 Execution Errors. 4-18 Device Dependant Errors . 4-19 5 List of Replaceable Parts. 5-1 Introduction. 5-3 How to Obtain Parts. 5-3 How to Contact Fluke. 5-3 Parts Lists. 5-4