MRC MO-2001 Manual de usuario

Your purchase of this MILLIOHM METER marks a step forward

for you into the field of precision measurement. Although this

METER is a complex and delicate instrument, its durable structure

developed. Please read the following instructions carefully and

always keep this manual within easy reach.

OPERATION MANUAL

MILLIOHM METER

Model : MO-2001

Hagavish st. Israel 58817 Tel: 972 3 5595252, Fax: 972 3 5594529 mrc@mrclab.com

PLEASE READ THIS MANUAL CAREFULLYBEFORE OPERATION

MRC.9.21

TABLE OF CONTENTS

FEATURES.....

....

2. SPECIFICATIONS...

....

2-1 General Specifications....

....

2-2 Electrical Specifications.............

....

FRONT PANEL DESCRIPTION...................

....

3-1 AC Power Input Socket...........................................

....

3-2 4 Wires Input Terminal

....

3-3 Display............................................

....

3-4 Zero Adjust Knob...........

....

3-5 Power Off/Range Rotary Switch..............................

3-6 200 m ohm/2000 m ohm, 20 ohm, 200 ohm,

2000 ohm Select Switch

BASIC 4 WIRES MEASURING PRINCIPLE..................................................

5. PRECAUTION & PREPARATIONS FOR

MEASUREMENT...................................................................

6. MEASURING PROCEDURES

....

1. FEATURES

* 4 terminal devices for accurate measurement of very low

resistance.

* Ideal for measuring the resistance of the motor coil,

transformer, PCB layout.

* Ideal for testing protective conductors, lightning

conductors and welded points.

* Wide measuring range, 0.1 m ohm - 2000 ohm, 5 ranges.

* 18 mm, large size LCD display, easy to read-out.

* LSI circuit provides high accuracy, reliability and durability.

* Built-in over input.

* Durable & portable housing plastic case with the front

protective cover.

2. SPECIFICATIONS

2-1 General Specifications

Display 18 mm (0.7") LCD,

Max. indication 1999.

Range 200 m ohm, 2,000 m ohm, 20 ohm,

200 ohm, 2000 ohm.

Zero Adjustment External adjustment for zero value of the

display.

Adjusting range approx. 100 counts.

Input Terminal 4 terminal input, accurate for low ohms

measuring.

Over input Indication Indication of "1".

Sampling Time Approx. 0.4 sec.

Operating Temp. 0to 50C ( 32to 122F ).

Operating Humidity Less than 80 % R.H..

Power Supply AC 110V 15%, 50/60 Hz

or AC 220V/240V 15%, 50/60 Hz.

Power Consumption Less than 2 VA.

Dimension 160 x 120 x 85 mm,

with housing front cover.

Weight Approx. 680 g (1.5 LB).

Standard Power Cable.............................1 PC.

Accessories 4 wire with 2 kelvin clips...........1 pair.

Instruction Manual....................1 PC.

2-2 Electrical Specifications ( 23 5 蚓 )

Range

Resolution

Test current

Accuracy

200 m ohm

0.1 m ohm

100 mA

0.75% + 4d)

2000 m ohm

1 m ohm

10 mA

20 ohm

10 m ohm

10 mA

200 ohm

0.1 ohm

1 mA

0.75% + 2d)

2000 ohm

1 ohm

1 mA

Range

Open circuit voltage

200 m ohm Approx. 3.8 V DC

2000 m ohm Approx. 3.4 V DC

20 ohm Approx. 3.4 V DC

200 ohm Approx. 3.2 V DC

2000 ohm Approx. 3.2 V DC

Remark :

Spec. tested under the environment RF Field Strength less

than 3 V/M & frequency less than the 30 MHz only.

3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 AC Power Input Socket

3-2 4 Wires Input Terminal

3-3 Display

3-4 Zero Adjust Knob

3-5 Power Off/Range Rotary Switch

4. BASIC 4 WIRES MEASURING PRINCIPLE

The DIGITAL MILLIOHM METER is the precision,

wide range & small resistance with high resolution

measuring instrument. As for preventing any measuring

errors, especial to avoid the influence of "LEAD STRAY

RESISTANCE" or "TEST WIRE'S RESISTANCE". The

meter is designed according the following "4 WIRES

MEASURING PRINCIPAL" to let the meter within high

accuracy.

Fig. 2

* Please refer to 2.2 Electrical Specification ( page 3 ),

each range exist the exciting test current ( from

Hi to Lo terminal ).

* The standard current is dropped to the unknown resistor

Rx.

* From the terminal Rx1, Rx2 can measure a voltage :

Vx = Is x Rx.

* According the Vx value, then meter can get the unknown

resistance (Rx) values from following formula :

Rx = Vx

* The measured resistance between Rx 1 and Rx 2 is not

affected by any stray resistance of test wire.

5. PRECAUTION & PREPARATIONS FOR

MEASUREMENT

* Please check carefully if the meter's power supply is

AC 110 V or AC 220 V before operating the meter.

There is a label at the rear of the meter to show the

proper power source outlet AC 110 V or AC 220 V.

* Please don't input voltage to input terminal ( Lo, Rx1,

Rx2, Hi ) to prevent any internal circuit damage.

6. MEASURING PROCEDURES

1) Rotate the " Power off/Range Rotary Switch " ( 3-5, Fig. 1 )

to the convenient & right range 200 m ohm, 2000 m ohm,

20 ohm, 200 ohm, 2000 ohm.

2) After select the above right range, then should make

the following " ZERO ADJ. PROCEDURE " :

a. Short the 2 clips.

b. Rotate the " Zero Adjust Knob " (3-4, Fig. 1) until

the display reading values show the zero values.

Consideration :

* Zero adjustment is necessary for range 200 m

ohm, 2000 m ohm, 20 ohm only.

* Recommend user select 200 m ohm range to

make "ZERO ADJ. PROCEDURE"

3) Connect the 2 clips as following Fig. 3 to measure

the unknown resistance.

Fig. 3

Connect the 2 Kelvin clips as following Fig. 4 to measure

the unknown resistance between two test points, such

as PCB layout.

Fig. 4

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