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MODEL 252

Digital Impedance Meter

Instruction Manual

P/N 43158-CD

Rev F

This owner’s manual was as current as possible when this product was manufactured.

However, products are constantly being updated and improved. Because of this, some

differences may occur between the description in this manual and the product you

received.

TEGAM, INC.

TEN TEGAM WAY

GENEVA, OH 44041

TEL: (440) 466-6100

FAX: (440) 466-6110

www.tegam.com

Publication Date: June 2005

Ten Tegam Way, Geneva, Ohio 44041 (440) 466-6100 (440) 466-6110

TABLE OF CONTENTS

DANGEROUS VOLTAGE POTENTIALS EXIST INSIDE THIS INSTRUMENT. MAINTENANCE

INSTRUCTIONS WITHIN THIS MANUAL ARE FOR USE BY QUALIFIED SERVICE PERSONNEL ONLY.

TO AVOID ELECTRICAL SHOCK, DO NOT ATTEMPT ANY SERVICING OTHER THAN THAT

CONTAINED IN THE OPERATION INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.

1 DESCRIPTION

1.1 INTRODUCTION 1-1

1.2SPECIFICATIONS 1-2

2 OPERATION

2.1 CONTROLS AND CONNECTORS 2-1

2.1.1FrontPanel 2-1

2.1.2RearPanel 2-3

2.2OPERATINGPROCEDURE 2-4

2.2.1 Power Requirements 2-4

2.2.2ApplyingPower 2-5

2.2.3 Connection to Unknowns 2-6

2.2.3.1 Test Fixture Compensation 2-8

2.2.4 Function Selection 2-9

2.2.5RangeSelection 2-12

2.2.6SummaryofOperation 2-13

2.3 MEASUREMENT TECHNIQUES 2-15

2.3.1 Resistance 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

2.3.10ComponentSorting 2-28

3 CIRCUIT DESCRIPTIONS

3.1GENERALDESCRIPTION 3-1

i

TABLE OF CONTENTS (continued)

4 MAINTENANCE

4.1 CALIBRATION PROCEDURE 4-1

4.1.1PowerSupplyCheck 4-2

4.1.2 Oscillator Adjust 4-2

4.1.3L,C,R,GAlignment 4-2

4.1.4 Dissipation Factor (D) Alignment 4-3

4.2MAINTENANCE 4-5

4.2.1PreventiveMaintenance 4-5

4.2.1.1 Cleaning 4-5

4.2.1.2 Visual Inspection 4-5

4.3 PREPARATION FOR CALIBRATION OR REPAIR SERVICE 4-6

4.4 WARRANTY

ii

SECTION 1

DESCRIPTION

1.1 INTRODUCTION

Model 252 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.

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. The position of the range switch, used in conjunction with the desired

function button and front panel range scale, indicate the unit of measurement being displayed by the

3-1/2 digit LED readout.

Excellent reliability of the Model 252 is assured through use of solid-state devices and etched circuit

board construction. Its small size is ideal for use on bench tops 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.

1-1

Table 1-1. Model 252 Specifications

Test Frequency: 1kHz ±1%.

Unknown Excitation: The 1kHz voltage (Vx) and current (Ix) levels listed in Table 1-1 are held

constant by an internal amplitude control circuit.

Measurement Rate: Four per second; one second is required for first reading after connecting

unknown to terminals.

Measurement Display: 3-1/2 digit LED with decimal point. Blanked for overload conditions.

Unit Display: Unit of mesurement being displayed by the LED readout is indicated by position

of the range switch, used in conjunction with the desired function button and the

front panel range scale.

External Bias: Rear panel terminals are provided for connection of external supply. 0V to 50VDC,

0.1A maximum. (Read Section 2.2.6 before using external bias.)

Static Charge Protection: Diode and resistor discharge network.

1-2

1.2 SPECIFICATIONS

Connection to Unknown: Four-terminal, shielded, connections are provided by the KELVIN KLIPS®

cable assembly (Tegam Part Number 43072) supplied with the Model

252.

Outputs: Analog signals of 1V per 1,000 counts, 1kΩsource resistance is available at rear panel.

L, C, R, or G, with simultaneous output of D for L or C.

Power Consumption: 4 watts typical.

Power Requirements: 100 to 125V or 200to250V,50/60Hz.

Fuse: 110V: 1/16A 250VAC Slow-Blow

220V:1/20A 250VAC Slow-Blow

Size: Height (with feet) - 100mm (3.9 in.)

Width - 260mm (10.2 in.)

Depth (overall) - 370mm (14.6 in.)

Weight: 3.2kg (7 lb.)

Accessories supplied with Model 252: Part No.

KELVIN KLIPS® Four-Terminal Clips 43072

Instruction Manual 43158

Options Available: Part No.

Model 1412B Universal Limits Comparator 31412B

Sorting Fixture Model 2001 (low frequency) 32001

Cable Assembly (for Model 2001 connection) 43586

Front Panel Dust Cover 43374

AdditionalAccessories PartNo.

Chip Tweezers 2005B/SP5132

Kelvin Klip Rebuild Kit KK100

Chip Tweezer Rebuild Kit 47422

1-3