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Electro Scientific Industries 253 Level Meter
Manufacturer:
Model:
253
Date:
1979
Class:
Type:
SubType:
Digital Impedance Meter

Information

The ESI model 253 Digital Impedance Meter is a semi-automatic instrument which permits rapid measurement of inductance (L) , capacitance (C) , resistance (R) , conductance (G) , and dissipation factor (D) at a test frequency of 1kHz. Measurement accuracy and versatility satisfies most demanding engineering or scientific applications . This instrument has both an autoranging mode and a manual range selection mode. The autoranging feature eliminates the need for manual range selecting, thus saving time and avoiding operator errors. It is designed to measure an unknown and select the lowest corresponding range automatically, thereby providing the highest resolution display. When a series of measurements are to be made within a particular range, time can be saved by turning the range switch to the corresponding fixed range position. Front panel LED lamps indicate the unit of measurement being displayed by the 3-1/2 digit LED readout. To operate, merely push the button for the desired function, manually turn the knob to the desired range, and connect the unknown. Kelvin KLIPS® test leads are included, thus ensuring true four-terminal connections. Excellent reliability of the model 253 is assured through use of solid state devices and etched circuit board construction. Its small size is ideal for use on benchtops where work space may be at a premium. The carrying handle tilts the unit to a convenient viewing angle. Rear panel brackets provide line cord storage and enable it to be operated in a vertical position.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
78
Size:
2.11 Mbytes (2211252 Bytes)
Language:
english
Revision:
Manual-ID:
43761B
Date:
01 June 1985
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
12 September 2016
MD5:
c47cb79981b78741fce706230dddc50a
Downloads:
809

Information

DESCRIPTION 1.1 INTRODUCTION 1-1 1.2 SPECIFICATIONS 1-2 2 OPERATION 2.1 CONTROLS AND CONNECTORS 2-1 2.1.1 Front Panel 2-1 2.1.2 Rear Panel 2-3 2.2 OPERATING PROCEDURE 2-4 2.2.1 Power Requirements 2-4 2.2.2 Applying Power 2-5 2.2.3 Connection to Unknowns 2-5 2.2.3.1 Test Fixture Compensation 2-7 2.2.4 Function Selection 2-9 2.2.5 Range Selection 2-12 2.2.6 Summary of Operation 2-14 2.3 MEASUREMENT TECHNIQUES 2-15 2.3.1 Resi stance' Measurements at 1kHz 2-15 2.3.2 Capacitance Measurements 2-15 2.3.3 Inductance Measurements 2-18 2.3.4 Determining Quality Factor (Q) of Inductors 2-19 2.3.5 Determining Dissipation Factor (D) of Capacitors using Nomograph 2-20 2.3.6 Using the Bias Feature 2-22 2.3.7 Signal Output Terminals 2-23 2.3.8 Measuring Grounded Unknowns 2-23 2.3.9 Measuring Battery Impedance 2-26 2.3.10 Component Sorting 2-28 3 CIRCUIT DESCRIPTIONS 3.1 GENERAL DESCRIPTION 3-1 3.2 DETAILED CIRCUIT DESCRIPTIONS 3-2 3.2.1 1kHz Oscillator 3-3 3.2.2 Unknown Differential Amplifier 3-3 3.2.3 Range Amplifier 3-3 3.2.4 Reference Generator and Phase Sensitive Detector 3—4 3.2.5 Dissipation Factor Circuit 3-4 3.2.6 Overload Blanking Circuit 3-5 3.2.7 Analog to Digital Converter 3-5 3.2.8 Function and Range Programming 3-5 3.2.9 Auto Range Circuit 3-6 4 MAINTENANCE 4.1 CALIBRATION PROCEDURE 4-1 4.1.1 Power Supply Check 4-2 4.1.2 Oscillator Adjust 4-2 4.1.3 L, C, R, G Alignment 4-2 4.1.4 Dissipation Factor (D) Alignment 4-3 4.2 MAINTENANCE 4-7 4.2.1 Preventive Maintenance 4-7 4.2.1.1 Cleaning 4-7 4.2.1.2 Visual Inspection 4-8 4.2.2 Troubleshooting 4-8 4.2.2.1 Troubleshooting Aids 4-8 4.2.2.2 Troubleshooting Procedure 4-9 4.3 CORRECTIVE MAINTENANCE 4-12 4.3.1 Obtaining Replacement Parts 4-12 4.3.2 Component Replacement Parts 4-13 4.4 REPACKING FOR SHIPMENT 4-14 5 PARTS LISTS AND DIAGRAMS 5.1 MAINFRAME PARTS 5-1 5.2 MOTHERBOARD CIRCUIT ASSEMBLY 5-2 5.3 DISPLAY CIRCUIT ASSEMBLY 5-8 5.4 AUTORANGE CIRCUIT ASSEMBLY 5-10 5.5 REAR PANEL ASSEMBLY 5-12 5.6 POWER SUPPLY CIRCUIT ASSEMBLY 5-14

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