Equipment information:

Electro Scientific Industries 253 Level Meter
Manufacturer:
Electro Scientific Industries
Model: 253
Date: 1979
Category: Measurement instruments
Group: Level Meter
Description: 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.

These manuals are available for the above equipment:

Electro Scientific Industries -- 253 -- Service and User Manual
File name: ESI-8026-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 78
Size: 2.11 Mbytes (2211252 Bytes)
Language: english
Revision:
Manual-ID/Number: 43761B
Date: 01 June 1985
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: c47cb79981b78741fce706230dddc50a
ed2kID: 755e7e93145221ab4b546dfa5e0cd402
Downloads: 3 since 12 September 2016
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
ESI-8026-Manual-Page-1-Picture
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