KEI2620A, 25A, 35A 电路图.pdf

Note This manual applies to SN 6560XXX and higher. HYDRA 2620A Data Acquisition Unit 2625A Data Logger 2635A Data Bucket Service Manual PN 202231 February 1997 1997 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY effective troubleshooting may require not only reference to the troubleshooting procedures in Section 5, but also some understanding of the detailed Theory of Operation in Section 2 and some tracing of circuit operation in the Schematic Diagrams presented in Section 8. Often, scanning the table of contents will yield 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 reference. If you know the topic name, the index at the end of the manual is probably a good place to start. The following chapter descriptions serve to introduce the manual: Chapter 1. Introduction and Specifications Introduces the instrument, describing its features, options, and accessories. This chapter also discusses 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 (2620A and 2625A) This chapter first categorizes these instruments circuitry into functional blocks, with a description of each blocks role 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 2A. Theory of Operation (2635A) This chapter first categorizes the instruments circuitry into functional blocks, with a description of each blocks role 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 5A. Chapter 3. General Maintenance Provides maintenance information covering handling, cleaning, 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 full calibration procedure is also presented. Chapter 5. Diagnostic Testing and Troubleshooting (2620A and 2625A) 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 8, and the access information provided in Chapter 3. Chapter 5A. Diagnostic Testing and Troubleshooting (2635A) The troubleshooting procedures presented in this chapter rely closely on both the Theory of Operation presented in Chapter 2A, the Schematic Diagrams shown in Chapter 8, and the access information provided 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. Introduction and Specifications Conventions1 1-5 Chapter 7. IEEE-488 Option (2620A only) This chapter describes the IEEE-488 option. Included are specifications, theory of operation, maintenance, and a list of replaceable parts. Schematic diagrams for this option are included at the end of the overall Service Manual (Chapter 8). Chapter 8. Schematic Diagrams Includes schematic diagrams for all standard and optional assemblies. A list of mnemonic definitions is also included to aid in identifying signal name abbreviations. Chapter 9. HYDRA Starter Calibration Software This chapter provides an extened tutorial that demostrates how to perform a series of operations. These operations introduce you to the menu structure of the Starter with cal software, explain what the menu items do, and teach you how to use them. 1-5. Conventions Throughout the manual set, certain notational conventions are used. A summary of these conventions follows: Instrument Reference The Hydra Data Acquisition Unit (Model 2620A), the Hydra Data Logger(Model 2625A), and the Hydra Data Bucket (Model 2635A) share manyfeatures and functions. The term Hydra refers to any of theseinstruments. The model number (e.g., 2620A, 2625A, or 2635A) isused when features unique to one instrument are being described. Printed Circuit Assembly The term pca is used to represent a printed circuit board and itsattached parts. Signal Logic Polarity On schematic diagrams, a signal name followed by a * is active (orasserted) low. Signals not so marked are active high. Circuit Nodes Individual pins or connections on a component are specified with adash (-) following the assembly and component reference designators.For example, pin 19 of U30 on assembly A1 would be A1U30-19. User Notation For front panel operation, XXXAn 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. Press a combination of buttons, one after the other. 3. Press and hold down a button, then press another button. 4. Press multiple buttons simultaneously. For computer interface operation, XXXAn uppercase word without parentheses identifies a command byname. Angle brackets around all uppercase letters mean press the key. (xxx)When associated with a keyword, a lowercase word inparentheses indicates an input required by the user. HYDRA Service Manual 1-6 Table 1-1. Hydra Features Channel Scanning Can be continuous scanning, scanning at an interval time, single scans, or triggered (internal or external) scans. Channel Monitoring Make measurements on a single channel and view these measurements on the display. Channel Scanning and Monitoring View measurements made for the monitor channel while scanning of all active channels continues. Multi-Function Display Left (numeric) display shows measurement readings; also used when setting numeric parameters. Right (alphanumeric) display used for numeric entries, channel number selection and display, status information, and operator prompts. Front-Panel Operation Almost all operations can be readily controlled with the buttons on the front panel. Measurement Input Function and Range Volts dc (VDC), volts ac (VAC), frequency (Hz), and resistance () inputs can be specified in a fixed measurement range. Autoranging, which allows the instrument to use the measurement range providing the optimum resolution, can also be selected. Temperature Measurement Thermocouple types J, K, E, T, N, R, S, B, and Hoskins Engineering Co. type C are supported.Also, DIN/IEC 751 (Pt 385) Platinum RTDs are supported. Totalize Events on the Totalizing Input Alarms Limits and Digital Output Alarm Indication 4-Terminal Resistance Measurements (Ch. 1 . 10) RS-232 Computer Interface Operation Measurement Rate Selection Nonvolatile Memory Storage of minimum, maximum, and most recent measurements for all scanned channels. Storage of Computer Interface setup, channel configurations, and calibration values. Features unique to the 2625A Data Logger. Storage of measurement data: storage for 2047 scans of up to 21 channels, representing up to 42,987 readings. Features unique to the 2635A Data Bucket. Internal storage of measurement data for 100 scans of up to 21 channels, representing up to 2,100 readings. Memory card storage of instrument setup configurations so that instrument may be quickly set up to do different tasks. Memory card storage of measurement data for up to 4,800 scans of 10 channels on a 256K-byte card or up to 19,800 scans of 10 channels on a 1M-byte memory card. Enhanced RS-232 interface with higher baud rates and hardware flow control using the Clear to Send modem control signal. Introduction and Specifications Specifications1 1-7 Table 1-2. Accessories ModelDescription 80i-410 80i-1010 Clamp-On DC/AC Current Probes 80J-10Current Shunt 2620A-05KField-installable IEEE-488 Option kit (Hydra Data Acquisition Unit only.) 2620A-100Extra I/O Connector Set: Includes Universal Input Module, Digital I/O and Alarm Output Connectors. 262XA-801Diconix(R) 80-column serial printer. 263XA-803Memory Card Reader for IBM-PC or compatible personal computer. Card reader is external to the PC and connects to a PC parallel port (LPT1, LPT2, etc.). (2635A Data Bucket only). 263XA-804256K-Byte Memory Card (2635A Data Bucket only). (This card is supplied with the instrument.) 263XA-8051M-Byte Memory Card (2635A Data Bucket only). 26XXA-901Hydra Logger Applications Package (Version 3.0) C40Soft carrying case. Provides padded protection for the instrument. Includes a pocket for the manual and pouch for the line cord. M00-200-634Rackmount Kit. Provides standard 19-inch rack mounting for one instrument (right or left side.) PM 8922Switchable X1, X10 passive probe. RS40Shielded RS-232 terminal interface cable. Connects the instrument to any terminal or printer with properly configured DTE connector (DB-25 socket), including an IBM PC(R), IBM PC/XT(R) or IBM PS/2 (models 25, 30, 50, P60, 70, and 80). RS41Shielded RS-232 modem cable. Connects the instrument to a modem with properly configured DB-25 male pin connector. Use an RS40 and an RS41 cable in series to connect with an IBM PC/AT(R). RS42Shielded serial printer cable. Contact Fluke for list of compatible printers. TL20Industrial test lead set. TL70ATest lead set (one set is supplied with the instrument). Y8021Shielded IEEE-488 one-meter (39.4 inches) cable, with plug and jack at each end. Y8022Shielded IEEE-488 two-meter (78.8 inches) cable, with plug and jack at each end. Y8023Shielded IEEE-488 four-meter (13 feet) cable, with plug and jack at each end. Y9109Binding post to BNC plug. Footnote: IBM PC, IBM PC/XT, and IBM PC/AT are registered trademarks of International Business Machines 1-6. Specifications Table 1-3 contains the specifications for the 2620A and 2625A. Table 1-4 contains the specifications for the 2635A. HYDRA Service Manual 1-8 Table 1-3. 2620A/2625A Specifications The instrument specifications presented here are applicable within the conditions listed in the Environmental portion of this specification. The specifications state total instrument accuracy following calibration, including: A/D errors Linearization conformity Initial calibration errors Isothermality errors Relay thermal emfs Reference junction conformity Temperature coefficients Humidity errors Sensor inaccuracies are not included in the accuracy figures. Accuracies at Temperatures Other Than Specified To determine typical accuracies at temperatures intermediate to those listed in the specification tables, linearly interpolate between the applicable 0oC to 60oC and 18oC to 28oC accuracy specifications. Response Times Refer to Typical Scanning Rate and Maximum Autoranging Time later in this table. DC Voltage Inputs Resolution RangeSlowFast 300 mV10 V0.1 mV 3V0.1 mV1 mV 30V1 mV10 mV 300V10 mV0.1V Accuracy (% V) Range18C to 28C0C to 60C 90 Days, Slow1 Year, Slow1 Year, Fast1 Year, Slow1 Year, Fast 300 mV0.026% + 20 V0.031% + 20 V0.047% + 0.2 mV0.070% + 20 V0.087% + 0.2 mV 3V0.028% + 0.2 mV0.033% + 0.2 mV0.050% + 2 mV0.072% + 0.2 mV0.089% + 2 mV 30V0.024% + 2 mV0.029% + 2 mV0.046% + 20 mV0.090% + 2 mV0.107% + 20 mV 300V0.023% + 20 mV0.028% + 20 mV0.045% + 0.2V0.090% + 20 mV0.107% + 0.2V Input Impedance 100 M minimum in parallel with 150 pF maximum for all ranges 3V and below 10 M in parallel with 100 pF maximum for the 30V and 300V ranges. Normal Mode Rejection 53 dB minimum at 60 Hz 0.1%, slow rate 47 dB minimum at 50 Hz 0.1%, slow rate Common Mode Rejection 120 dB minimum at dc, 1 k imbalance, slow rate 120 dB minimum at 50 or 60 Hz 0.1%, 1 k imbalance, slow rate Maximum Input 300V dc or ac rms on any range for channels 0, 1, and 11 150V dc or ac rms for channels 2 to 10 and 12 to 20 Voltage ratings between channels must not be exceeded Crosstalk Rejection Refer to Crosstalk Rejection at the end of this table. Introduction and Specifications Specifications1 1-9 Table 1-3. 2620A/2625A Specifications (cont) Thermocouple Inputs Thermocouple Accuracy (C)* 18C to 28C0C to 60C Type Temperature (C) 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast J -100.00 0.00 760.00 0.49 0.38 0.49 0.53 0.40 0.54 1.00 0.77 0.97 0.73 0.53 0.91 1.22 0.91 1.35 K -100.00 0.00 1000.00 1372.00 0.57 0.42 0.73 0.95 0.60 0.44 0.80 1.05 1.20 0.88 1.46 1.89 0.82 0.57 1.36 1.85 1.43 1.02 2.03 2.70 N -100.00 0.00 400.00 1300.00 0.66 0.51 0.46 0.75 0.69 0.53 0.49 0.83 1.48 1.14 0.99 1.53 0.90 0.66 0.72 1.45 1.70 1.29 1.23 2.16 E -100.00 0.00 500.00 1000.00 0.50 0.36 0.40 0.58 0.53 0.38 0.43 0.65 0.99 0.72 0.77 1.11 0.75 0.52 0.71 1.16 1.22 0.86 1.05 1.63 T -150.00 0.00 400.00 0.79 0.42 0.37 0.84 0.45 0.40 1.66 0.89 0.74 1.16 0.58 0.61 1.99 1.04 0.97 R 250.00 1000.00 1767.00 0.96 0.86 1.14 0.98 0.91 1.24 2.48 2.10 2.65 1.14 1.29 1.96 2.65 2.48 3.38 S 250.00 1000.00 1767.00 1.01 0.97 1.29 1.03 1.02 1.39 2.62 2.37 3.02 1.20 1.42 2.17 2.80 2.77 3.80 B 600.00 1000.00 1820.00 1.26 0.92 0.97 1.28 0.95 1.03 3.52 2.48 2.41 1.40 1.16 1.51 3.64 2.69 2.89 C 0.00 500.00 1000.00 1850.00 2316.00 0.76 0.66 0.85 1.47 2.30 0.78 0.69 0.91 1.61 2.53 1.87 1.53 1.90 3.18 4.93 0.92 0.96 1.41 2.70 4.35 2.01 1.81 2.41 4.29 6.77 * Sensor inaccuracies are not included. HYDRA Service Manual 1-10 Table 1-3. 2620A/2625A Specifications (cont) Thermocouple Inputs (cont) Input Impedance 100 M minimum in parallel with 150 pF maximum Common Mode and Normal Mode Rejection See Specifications, DC Voltage Inputs Crosstalk Rejection Refer to Crosstalk Rejection at the end of this table. Open Thermocouple Detect Small ac signal injection and detection scheme before each measurement detects greater than 1 to 4 k as open. Performed on each channel unless defeated by computer command. RTD Inputs Type DIN/IEC 751, 100 Platinum RTD 1 Year, 4-Wire Accuracy (C) TemperatureResolution18C to 28C0C to 60C (C) SlowFastSlowFastSlowFast -200.000.020.010.080.490.120.54 0.000.020.010.210.670.500.96 100.000.020.010.270.750.691.17 300.000.020.010.410.921.101.60 600.000.020.010.651.211.772.33 2-Wire Accuracy Not specified Maximum Current Through Sensor 1 mA Typical Full Scale Voltage 0.22V Maximum Open Circuit Voltage 3.2V Maximum Sensor Temperature 600C nominal 999.99F is the maximum that can be displayed when using F. Crosstalk Rejection Refer to Crosstalk Rejection at the end of this table. Introduction and Specifications Specifications1 1-11 Table 1-3. 2620A/2625A Specifications (cont) AC Voltage Inputs (True RMS AC Voltage, AC-Coupled Inputs) Range Resolution Minimum Input for SlowFast Rated Accuracy 300 mV10 V100 V20 mV 3V100 V1 mV200 mV 30V1 mV10 mV2V 300V10 mV100 mV20V 1 Year Accuracy (%V) Frequency 18C to 28C0C to 60C SLowFastSlowFa