KEI2640A, 2645A 电路图.pdf

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1、PN 942615 March 1995 1995 Fluke Corporation, Inc. All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. 2640A/2645A NetDAQ Data Acquisition Tools Service Manual RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY the 150V value is for all other channels. 2 Drift

2、 Correction refers to an automatic internal measurement step performed with each scan to correct for drift due to changes in ambient temperature and humidity. Table 1-2. Summary of 2640A/2645A Measurement Capabilities Capability2640A2645A Volts DC MeasurementsRanges: 90 mV 300 mV 3V 30V 150/300V 1 A

3、utorange Ranges: 90 mV 300 mV 3V 30V 50V Autorange Volts AC MeasurementsRanges: 300 mV 3V 30V 150/300V 1 Autorange Ranges: 300 mV 3V 30V Autorange Resistance MeasurementsRanges: 300 3 k 30 k 300 k 3 M Autorange Ranges: 30 k 300 k 3 M Autorange Introduction and Specification Introduction1 1-5 Table 1

4、-2. Summary of 2640A/2645A Measurement Capabilities (cont) Capability2640A2645A Temperature Measurements (Thermocouple) 2 Thermocouples: JKRSE TBCN Thermocouples: JKRSE TBCN Temperature Measurements (RTD) (Two-wire) RTD R0:10 to 1010(None) Temperature Measurements (RTD) (Four-wire) RTD R0:10 to 1010

5、RTD R0:10 to 1010 Frequency Measurements 3Ranges:AutorangeRanges:Autorange Amperes DC Measurements 4Ranges:4 to 20 mA 0 to 100 mA Ranges:4 to 20 mA 0 to 100 mA 1 300V range available only on channels 1 and 11. 2 Open thermocouple detection is supported on a per-channel basis. 3 Minimum frequency is

6、20 Hz. Signal strength must be at least 50 mV ac rms. 4 Shunt resistor required (enter value; default is 10 ohms). The 4 to 20 mA scale displayed as 0% (4 mA) to 100% (20 mA). Table 1-3. Summary of 2640A/2645A Features FeatureDescription Analog Channels20 (channels 1 to 20) Computed Channels10 (chan

7、nels 21 to 30) Alarm LimitsTwo per channel Mx+B ScalingAny configured channel (1 to 30) Scan TriggeringInterval/External/Alarm Trigger Channel MonitoringAny configured channel, scanning or not scanning Setup and OperationVia host computer Communications PortsEthernet 10BASE2 and 10BASE-T Primary Pow

8、erAC - 107 to 264V ac, 50/60 Hz DC - 9 to 16V dc Nonvolatile Memory (unaffected by cycling instrument power) Instrument parameters: Base Channel Number, Line Frequency, Network Type, Socket Port, IP Address, Baud Rate. (See Chapter 2.) Permanent Data StorageVia host computer Real-Time Trend Plotting

9、Via host computer NetDAQ Service Manual 1-6 Options and Accessories1-2. Table 1-4 summarizes the available models, options and accessories, including measurement transducers, software, connector sets, Ethernet interfaces, cables, and components. Table 1-4. Models, Options and Accessories ModelDescri

10、ption 2640ANetDAQ Instrument 2645ANetDAQ Instrument 264XA-901NetDAQ Logger for Windows (Isolated Network) 264XA-902NetDAQ Logger for Windows (General Network) 264XA-902UNetDAQ Logger for Windows Network (Upgrade Kit) 264XA-801Ethernet Card 264XA-802Parallel-to-LAN Adapter (10BASE2) 80i-410Clamp-On D

11、C/AC Current Probe 80i-1010Clamp-On DC/AC Current Probe 2620A-100I/O connector set, including Universal Input Module, DIGITAL I/O and ALARM/TRIGGER I/O connectors. 2620A-1014-20 mA Current Shunt Strip 942615NetDAQ Service Manual Y264119-inch Rackmount Kit Y26434-meter Cable Kit Instrument Connector

12、Set, 2620A-1001-3. The 2620A-100 is a complete set of input connectors: one Universal Input Module, one ALARM/TRIGGER I/O connector, and one DIGITAL I/O connector. Each instrument comes with a 2620A-100 Instrument Connector Set. The use of additional connector sets allows quick equipment interface t

13、o several wiring setups. Host Computer Ethernet Interfaces1-4. The 264XA-801 is the recommended Ethernet card and the 264XA-802 is the recommended Parallel-to-LAN Adapter for host computer installations. Interconnection Cables and Components1-5. Cables for equipment interconnection can be purchased

14、as an option or fabricated. Ethernet interconnection components such as BNC T and 50-ohm terminations are available from any components supplier. Introduction and Specification Operating Instructions1 1-7 Operating Instructions1-6. Full operating instructions are provided in the NetDAQ User Manual (

15、PN 942623). Refer to the User Manual as necessary during the maintenance and repair procedures presented in this Service Manual. Organization of the Service Manual1-7. This manual focuses on performance tests, calibration procedures, and component-level repair of the 2640A and 2645A networked data a

16、cquisition units. To that end, manual chapters are often interdependent; effective troubleshooting may require not only reference to the troubleshooting procedures in Chapter 5, but also some understanding of the detailed Theory of Operation in Chapter 2 and some tracing of circuit operation in the

17、Schematic Diagrams presented in Chapter 7. Often, scanning the table of contents yields an appropriate place to start using the manual. A comprehensive table of contents is presented at the front of the manual; local tables of contents are also presented at the beginning of each chapter for ease of

18、reference. If you know the topic name, the index at the end of the manual is probably a good place to start. The following descriptions introduce the manual: Chapter 1 - Introduction and Specifications Introduces the instrument, describing its features, options, and accessories. This chapter also di

19、scusses use of the Service Manual and the various conventions used in describing the circuitry. Finally, a complete set of specifications is presented. Chapter 2 - Theory of Operation This chapter first categorizes the instruments circuitry into functional blocks, with a description of each blocks r

20、ole in overall operation. A detailed circuit description is then given for each block. These descriptions explore operation to the component level and fully support troubleshooting procedures defined in Chapter 5. Chapter 3 - General Maintenance Provides maintenance information covering handling, cl

21、eaning, and fuse replacement. Access and reassembly procedures are also explained in this chapter. Chapter 4 - Performance Testing and Calibration This chapter provides performance verification procedures, which relate to the specifications presented in Chapter 1. To maintain these specifications, a

22、 full calibration procedure is also presented. Chapter 5 - Diagnostic Testing and Troubleshooting The troubleshooting procedures presented in this chapter rely closely on both the Theory of Operation presented in Chapter 2, the Schematic Diagrams shown in Chapter 7, and the access information provid

23、ed in Chapter 3. Chapter 6 - List of Replaceable Parts Includes parts lists for all standard assemblies. Information on how and where to order parts is also provided. Chapter 7 - Schematic Diagrams Includes schematic Diagrams for all standard and optional assemblies. A list of mnemonic definitions i

24、s also included to aid in identifying signal name abbreviations. NetDAQ Service Manual 1-8 Conventions1-8. Throughout the manual set, certain notational conventions are used. A summary of these conventions follows: Instrument Reference The term instrument is used in this manual to refer to both the

25、2640A NetDAQ and 2645A NetDAQ networked data acquisition units. The model number (2640A or 2645A) is used when discussing characteristics unique to one instrument. Printed Circuit Assembly The term pca is used to represent a printed circuit board and its attached parts. Signal Logic Polarity On sche

26、matic Diagrams, a signal name followed by a * character is active (or asserted) low. Signals not so marked are active high. Circuit Nodes Individual pins or connections on a component are specified with a dash (-) following the assembly and component reference designators. For example, pin 19 of U30

27、 on assembly A1 would be A1U30-19. Front Panel Interface User Notation For front panel operation, XXX, an uppercase word or symbol without parentheses indicates a button to be pressed by the user. Buttons can be pressed in four ways: 1. Press a single button to select a function or operation. 2. Pre

28、ss a combination of buttons, one after the other. 3. Press and hold down a button; then press another button. 4. Press multiple buttons simultaneously. Computer Interface User Notation For computer interface operation: XXX An uppercase word without parentheses identifies a command by name. Angle bra

29、ckets around all uppercase letters mean press the key. (xxx) A lowercase word in parentheses indicates a keyboard input. Specifications1-9. Specifications are divided into three sections. The first section contains the combined specifications that apply equally to both the 2640A and 2645A instrument

30、s. The second section contains specifications that apply only to the 2640A instrument. The third section contains specifications that apply only to the 2645A instrument. 2640A/2645A Combined Specifications1-10. The following specifications apply equally to both the 2640A and 2645A instruments. The t

31、opics include: 2640A/2645A General Specifications 2640A/2645A Environmental Specifications 2640A/2645A Digital I/O and Totalizer Interface Introduction and Specification Specifications1 1-9 2640A/2645A General Specifications1-11. Table 1-5 provides the general specifications for the 2640A and 2645A

32、instruments. Table 1-5. 2640A/2645A General Specifications SpecificationCharacteristic Channel Capacity20 I/O Lines Total12 Size9.3 cm (3.67 in) high, 21.6 cm (8.5 in) wide, 36.2 cm (14.28 in) deep WeightNet, 4 kg (8.8 lb.) Shipping, 6.0 kg (13.2 lb.) Power107 to 264V ac (no switching required), 45

33、to 65 Hz, 15 VA maximum 9V dc to 16V dc, 6W maximum. Specifications are for 50 or 60 Hz operation. If both sources are applied simultaneously, ac voltage is used if it exceeds approximately 8 times the dc voltage. Automatic switchover occurs between ac and dc without interruption. StandardsBoth inst

34、ruments comply with: IEC 1010-1 UL 1244 CSA Bulletin 556B ANSI/ISA-S8201-1988 CSA C22.2 No. 101.1-92 Vfg. 243/1991 (when shielded cables are used) FCC-15B, Class B level (when shielded cables are used) Serial Interface (RS-232C) Connector: 9 pin male (DB-9P) Signals: TX, RX, DTR, RTS, GND Modem Cont

35、rol: full duplex Baud rates: 4800, 9600, 19200, 38400 Data format: 8 data bits, no parity bit, one stop bit Flow control: XON/XOFF Echo: Off Common Mode Voltage 2640A 150V (300V on channels 1 and 11) 2645A 50V dc or 30V ac rms. Measurement Speed (Scanning Rates) 2640A Slow - 6 readings per second Me

36、dium - 48 readings per second (60 Hz) Fast - 143 readings per second (20 configured channels) Single Channel - 120 readings per second 2645A Slow - 54 readings per second (60 Hz) Medium - 200 readings per second Fast - 1000 readings per second (20 configured channels) Single Channel - 400 readings p

37、er second Accuracy of Medium Scanning Rate Equal to (Fast Accuracy Rate + Slow Accuracy Rate)/2 Additional error if “Automatic drift correction” is turned off. If the instrument is fully warmed-up at the time drift correction was disabled, i.e., turned on at least 1 hour earlier: 1/10 of the 90-day

38、specification per C change in ambient temperature from the temperature when drift correction was disabled. If the instrument was not fully warmed up at the time of drift correction was disabled: add an error equal to the 90-day specification for instrument warmup +1/10 of the 90-day specification pe

39、r C change in ambient temperature from the temperature when drift correction was disabled. NetDAQ Service Manual 1-10 2640A/2645A Environmental Specifications1-12. Table 1-6 provides a summary of the environmental specifications for the 2640A/2645A. Table 1-6. Environmental Specifications Specificat

40、ionCharacteristic Warmup Time1 hour to rated specifications -or- 15 minutes if relative humidity (noncondensing) is 50% or less. Operating Temperature-10C to 60C (14F to 140F) Storage Temperature-40C to +70C (-40F to +158F) Relative Humidity90% maximum for -10C to 28C (14F to 82.4F) 75% maximum for

41、28C to 35C (82.4F to 95F) 50% maximum for 35C to 60C (95F to 140F) (3 M range, reduce humidity rating by 25% for 1 hour warmup. The 3 M range meets full humidity ratings with 2-hour warmup.) AltitudeOperating: 2,000m (6,561 ft) maximum Non-operating: 12,200m (40,000 ft) maximum Vibration0.7g at 15 H

42、z 1.3g at 25 Hz 3g at 55 Hz Shock30g half-sine per Mil-T-28800 Bench handling per Mil-T-28800 2640A/2645A Input/Output Capabilities1-13. The following specifications include the input/output functions, including the Digital I/O, Trigger Out, Trigger In, and Master Alarm output. Digital I/O1-14. Tabl

43、e 1-7 provides a summary of the Digital I/O specifications for the 8 Digital I/O lines (0 to 7). Digital I/O is located on the DIGITAL I/O connector, terminals 0 to 7, and GND. Table 1-7. 2640A/2645A DIGITAL I/O Specification SpecificationCharacteristic Maximum Input Voltage30V Minimum Input Voltage

44、-4V IsolationNone (dc coupled) Threshold1.4V Hysteresis500 mV SpecificationCharacteristic Output Voltage - TTL Logical Zero0.8V maximum for an Iout of -1.0 mA (1 LSTTL load) Output Voltage - TTL Logical One3.8V minimum for an Iout of 0.05 mA (1 LSTTL load) Output Voltage - Non-TTL Load Zero1.8V maxi

45、mum for an Iout of -20 mA Output Voltage - Non-TTL Load One3.25V maximum for an Iout of -50 mA Introduction and Specification Specifications1 1-11 Trigger In1-15. Table 1-8 provides a summary of the Trigger In specifications. The Trigger In input is located on the ALARM/TRIGGER I/O connector, termin

46、als TI and GND. Table 1-8. 2640A/2645A Trigger In (TI) Specification SpecificationCharacteristic Logical High - Trigger not setMinimum: 2.0V Maximum: 7.0V Logical Low - Trigger setMinimum: -0.6V Maximum: +0.8V CompatibilityTTL or Contact Closure IsolationNone (dc coupled) Minimum Pulse Width5 s Maxi

47、mum FrequencyNominal 400 Hz Repeatability3 ms Trigger Out1-16. Table 1-9 provides a summary of the Trigger Out specifications. The Trigger Out output is located on the ALARM/TRIGGER I/O connector, terminals TO and GND. Table 1-9. 2640A/2645A Trigger Out (TO) Specification SpecificationCharacteristic

48、 TTL Logical Zero - Trigger Out Set0.8V maximum for an Iout of -1.0 mA (1 LSTTL load) TTL Logical One - Trigger Out Not Set3.8V minimum for an Iout of 0.05 mA (1 LSTTL load) Non-TTL Logical Zero - Trigger Out Set1.8V maximum for an Iout of -20 mA Non-TTL Logical One - Trigger Out Not Set3.25V maximu

49、m for an Iout of -50 mA Pulse Duration (Logic Low)125 s IsolationNone Master Alarm1-17. Table 1-10 provides a summary of the Master Alarm specifications. The Master Alarm output is located on the ALARM/TRIGGER I/O connector, terminals MA and GND. Table 1-10. 2640A/2645A Master Alarm (MA) Specification SpecificationCharacteristic TTL Logical Zero - Master Alarm Set0.8V maximum for an Iout of -1.0 mA (1 LSTTL load) TTL Logical One - Master Alarm Not Set3.8V minimum for an Iout of 0.05 mA (1 LSTTL load) Non-TTL Logical Zero - Master Alarm Set1.8V maximum for an Iout of -20