FLUKE 525a 电路图.pdf

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1、 525A Temperature/Pressure Calibrator Service Manual PN 1644492 March 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 product is warranted

2、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 autho

3、rized 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 accord

4、ance 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 cus

5、tomers 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 impor

6、tation 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 Flu

7、ke 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

8、 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 operat

9、ion 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

10、 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 MER

11、CHANTABILITY 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,

12、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 affe

13、ct 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 TitlePage Introduction. 1

14、 Contacting Fluke . 1 Safety Information. 1 Calibrator Specifications. 3 General Specifications . 3 DC Voltage Specifications, Output. 4 DC Current Specifications, Output . 4 Resistance Specifications, Output. 5 Resistance Specifications, Input. 5 Thermocouple Specification, Output and Input. 6 TC m

15、V Specifications, Input and Output. 7 RTD and Thermistor Specification, Output. 8 RTD and Thermistor Specification, Input. 9 Pressure Measurement . 11 Theory of Operation. 11 Micro-Controller Section. 11 Analog Section. 12 Basic Maintenance. 12 Cleaning the Calibrator. 12 Replacing a Line Fuse. 12 T

16、o Check or Replace a Fuse. 13 Changing Line Voltage. 13 Modular-Level Maintenance. 14 Disassembly. 15 Reassembly . 15 Output Block Subassembly Connections. 17 Keypad to Main PCB. 19 Display Assembly to Main PCB. 19 Opto RS232 to Main PCA. 20 Reinstalling the Circuit Boards. 21 Connecting the Power M

17、odule . 21 Final Assembly and Inspection. 22 Performance Tests. 23 Required Equipment List . 23 Testing DC Voltage. 24 RadioFans.CN 收音机爱 好者资料库 525A Service Manual ii Testing DC Current. 25 Testing Thermocouple Output . 26 Testing CJC (Cold Junction Compensation). 27 CJC (Cold Junction Compensation)

18、Calibration. 27 Testing Thermocouple Input. 28 Testing Ohms Output. 29 Testing Ohms Input. 30 Testing Pressure Modules. 32 Calibration Adjustment . 32 Initiating Communication . 32 Starting Adjustment Mode. 32 Adjustment Sequence. 33 14: Calibrate DAC, Digital to Analog Converter Adjustment. 34 1: 1

19、00 mV Source to 4: 100 V Source, Adjusting DC Source. 34 5: 100 mA Source, Adjusting DC Current Source. 35 6: Hi Ohms Source, Adjusting High Resistance Source. 37 7: Low Ohms, Adjusting Low Ohms Source. 38 8: Hi Ohms, Adjusting High Resistance Measure. 38 9: Low Ohms, Adjusting Low Resistance Measur

20、e. 40 10: SPRT 25, Adjusting SPRT Low Resistance Measure . 41 11: TC SOURCE, Adjusting TC mVolt Source . 43 12: TC Read, Adjusting TC mVolt Measure. 43 Customer Replaceable Parts. 45 iii List of Tables TableTitlePage 1.Symbols Used on the Calibrator. 2 2.Replacement Fuses . 13 3.Front Panel Wire Col

21、or Assignments. 16 4.Rear Panel Wire Color Assignments . 16 5.Output Block to Main PCA Connections. 17 6.TC PCA to Main PCA Connections. 18 7.Opto RS232 to Main PCA Connections . 20 8.Power Module to Main PCA Connections. 21 9.Power Connections. 22 10.Required Equipment. 23 11.Testing DC Voltage. 24

22、 13.TC Temperatures . 26 14.Ohms Output Ranges. 29 15.Ohms Ratio Table. 31 16.Calibration Dependencies. 33 17.List of Equipment for Voltage Calibration Adjustments. 34 18.List of Equipment for Current Calibration Adjustments . 35 19.List of Equipment for High Ohms Measure Calibration Adjustments . 3

23、8 20.List of Equipment for High Ohms Measure Calibration Adjustments . 40 21.List of Equipment for Low Ohms Measure Calibration Adjustments. 41 22.List of Test Equipment for Adjusting TC Source. 43 23.List of Test Equipment for Adjusting TC Read. 43 24.List of Test Equipment for Adjusting TC CJC. 45

24、 25.Replacement Parts. 47 26.Accessories. 48 525A Service Manual iv v List of Figures Figure TitlePage 1. Accessing the Fuse. 14 2.Wiring Connections. 17 3.Solder Connections for the TC PCA. 18 4. Keypad PCA Connections. 19 5.Connections for the Opto RS232 PCA . 20 6.Power Module Connections. 22 7.M

25、easuring DC Current. 25 8.Testing TC Output. 26 9.Connections for CJC Calibration. 27 10.Connections for Measuring TC Input. 28 11.Connection for Measuring Resistance Output. 29 12.1281 Connection Diagram. 30 13.Connection for Measuring Ohms. 31 14.Exploded View of the 525A . 46 525A Service Manual

26、vi 1 525A Introduction This manual provides user-service information for the 525A Temperature/Pressure Calibrator (hereafter referred to as the Calibrator). Details regarding verification of the Calibrators functionality and calibration, basic maintenance, contacting Fluke service centers, and impor

27、tant safety information are also contained within this manual. Contacting Fluke To contact Fluke, order accessories, or locate the nearest Fluke Service Center or distributor, call: USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31-402-678-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500 Or, visit Flukes Web site at . Safety Information The Calibrator complies with EN 61010, ANSI/ISA-S82.01-1994, an