Fluke 57LFC Calibrateur
Fabricant:
Modèle:
57LFC
Date:
2004
Catégorie:
Groupe:
Description:
System Calibrator

Information

The Fluke Model 57LFC System Calibrator (hereafter called the Calibrator) is a precise instrument that calibrates a wide variety of electrical measuring instruments. This Calibrator maintains a high accuracy over a wide ambient temperature range, and is able to test instruments in harsh environments, eliminating the restriction of calibrating only in a temperature-controlled standards laboratory. With a 57LFC you can calibrate precision multimeters that measure ac or dc voltage, ac or dc current, and resistance. The Calibrator operates in a similar manner to the 57XXA series calibrators. Specifications are provided at the end of this chapter. The Calibrator is a fullyprogrammable precision source of the following: • DC voltage to 220 V. • AC voltage to 220 V rms, with output available from 10 Hz to 100 kHz. • AC and DC current to 2.2 A, with AC output available from 10 Hz to 20 kHz. • Resistance in values from 0 Ω to 19 MΩ in 1 and 1.9x. Features of the Calibrator include the following: • Automatic meter error calculation obtained through using a simple remote adjust. • Programmable entry limits used for restricting the levels that can be remotely keyed into the Calibrator, preventing access to levels that may be harmful to equipment or personnel. • Real-time clock and calendar. • Offset and scaling modes that simplify linearity testing of multimeters. • Standard IEEE-488 (GPIB) Interface, complying with ANSI/IEEE Standards 488.1- 1987 and 488.2-1987. • Internal self-testing and diagnostics of analog and digital functions. • Status LEDs on front panel to indicate standby (yellow), operate (green), high voltage (red), and fault (red and yellow).

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manuel de réparation
Type manuel:
manuel de réparation
Pages:
208
Taille:
4.63 Mbytes (4853336 Bytes)
Langue:
english
Révision:
Manuel-ID:
Date:
Qualité:
Électronique de documents, numérisation sans, bien lisible.
Date de transfert:
29 novembre 2014
MD5:
171d891cbaf195552a2fef5e40509212
Téléchargements:
874

Information

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 Relay Switch Matrix and Control ... 2-14 Other Control Circuits ... 2-26 Guard Circuits ... 2-26 Compensation Circuits ... 2-27 Monitor ... 2-27 Diagnostics ... 2-29 A6 Digital Synthesis PCA ... 2-33 Precision, Dual Tracking, +/-7 V References ... 2-33 Precision, 28bit, PWM, Dual DAC’s ... 2-33 DC Voltage Operation ... 2-34 DDS Waveform Generation ... 2-34 AC Voltage Operation ... 2-35 DC Current Operation ... 2-35 AC Current Operation ... 2-35 Thermocouple Temperature Measurement ... 2-35 Iso-thermal Block Reference Junction Temperature Measurement ... 2-36 Thermocouple Voltage Measurement: ... 2-36 Thermocouple Temperature Simulation ... 2-36 Analog to Digital Converter ... 2-36 Fault Detection ... 2-36 Digital Control ... 2-37 A7 Current PCA ... 2-37 Detailed Hardware Description of DC/AC Current ... 2-40 Low Current Output Amplifier ... 2-40 Mid-Current Output Amplifier ... 2-41 High Current Output Amplifier ... 2-42 High Current Amplifier Power Supplies (Mongo Supplies) ... 2-43 A8 High Voltage PCA ... 2-44 Detailed Hardware Description of the 22 V Amplifier ... 2-46 Detailed Description of the 220 V Amplifier ... 2-47 Detailed Hardware Description of the High Voltage Regulator ... 2-49 Heat Sink Temperature Measurement ... 2-51 Digital Interface and Control ... 2-51 A9 Out-Guard CPU PCA ... 2-52 Real Time Clock Memory ... 2-52 IEEE-488 Interface ... 2-52 3 Calibration and Verification ... 3-1 Calibration ... 3-3 Procedure Architecture ... 3-3 ZERO ... 3-3 MAIN ... 3-3 DIAG ... 3-3 Calibration Steps ... 3-3 RUN ... 3-4 Instruction Step (INS) ... 3-4 Reference Step (REF) ... 3-4 NOT ... 3-4 Verification Tests ... 3-5 Test Equipment ... 3-5 Calibrator Configuration and Pre-check ... 3-6 DC Voltage Test ... 3-7 AC Voltage Tests ... 3-9 AC Voltage Accuracy Test ... 3-9 Frequency Accuracy Test ... 3-10 DC Current Test ... 3-14 AC Current Test ... 3-15 Current Output Compliance Test ... 3-17 Voltage Output Compliance Test ... 3-17 Harmonic Test Levels for AC Volts ... 3-19 Harmonic AC Current Test ... 3-21 External Trigger ... 3-21 Verification Test Check List ... 3-22 4 Maintenance ... 4-1 Introduction ... 4-3 Replacing the Fuse ... 4-3 Cleaning the Air Filter ... 4-4 Replacing PCA Modules ... 4-6 Cleaning the Exterior ... 4-7 5 List of Replaceable Parts ... 5-1 Introduction ... 5-3 How to Obtain Parts ... 5-3 Service Centers ... 5-4 Parts Lists ... 5-4 6 Schematic Diagrams ... 6-1

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