Unit UT276A Manual de usuario

P/N:110401103514

Contents

UT276A/278A OPERATING MANUAL

I Safety Instructions

II Product Overview

III Unpack and Check

IV Product Specification

1 Series Types

2 Range and Accuracy

3 Technical Specification

V Clamp Meter Structure

VI Liquid Crystal Display

1 Liquid Crystal Display

2 Instruction for Special Symbol

3 Display Demonstration

VII Operation Methods

1 Power-on

2 Power-off

3 Resistance Measurement

4 Current measurement

5 Data hold/unlock/store

I Safety Instructions

Thank you for purchasing the Clamp-on Ground Resistance of our company

and for the full use of the product, please:

Read the user manual carefully.

observe the operation notes listed in the manual.

Under no circumstances shall fail to pay attention to the safety in using the

clamp meter.

Pay attention to the stipulate measurement scope and operation environment.

The instrument shall apply to ground resistance testing instead of the current

of power frequency power wire, or it will affect the clamp's magnetic property

and the accuracy of ground resistance testing finally .

Pay attention to the labeled words on the surface board and backboard.

Before start it, pull the trigger once or twice to confirm the jaw of clamp can

close or open freely .

When starting it, don't pull the trigger and clamp any wires.

Clamp the objects being tested only after displaying the sign OL after

started the instrument.

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

7 Alarm Function Setting

8 Alarm Critical Value Inquiry

9 Data Wipe

10 Data Uploading to Computer

VIII Measurement Principles

1 Resistance Measurement Principle

2 Current Measurement Principle

IX Ground Resistance Measurement Method

1 Multi-point Ground System

2 Limited Point Ground System

3 Single Point Ground System

X On-site Application

1 Application of Power System

2 Application of Telecommunication System

3 Application of the building lightning protection ground system

4 Application of the gas station ground system

XI Notes about Ground Resistance Measurement

Appendix: loop Resistance Analysis

6 Data Inquiry 24

Contact surface of the clamp jaw shall keep clean and refrained from cleaning

by corrosive and coarse matters.

Refrain from any shock on the clamp meter , especially the junction surface of

the clamp jaw.

It is strongly recommended using our company's explosion-proof Clamp-on

Ground Resistance tester in dangerous occasions.

The explosion-proof product is prohibited to dismantle and replace the battery

in dangerous place.

The clamp meter shall sound sporadically with light hum in measuring the

resistance, which is normal and shall be distinctive from the warning sound

beep--beep--beep-- .

Do not exceed the upper limits of the clamp meter in measuring the wire's

current.

Take out battery if do not use it for long time.

Dismantling, calibration and maintenance of the clamp meter shall be

conducted by the authorized qualified personnel.

If any danger might be resulted in continuation use by the inner reason of the

meter, stop using it immediately and pack it to the authorized qualified

institution to address the problem.

The contents labeled with * in the user manual shall be only applicable to

UT278A.

II Product Overview

The series of clamp-on ground resistance tester represents a significant

breakthrough of the traditional ground resistance measurement techniques and

apply widely to grounding resistance measurement in electricity,

telecommunication, meteorology, oilfield, architecture and industrial electric

equipment.

In measuring the ground system with loop, the series of clamp-on ground

resistance tester don't need to disconnect the ground down lead and any auxiliary

electrode, safe and fast, easy to use.

The series of clamp-on ground resistance tester can measure the grounding

problems with the traditional methods and apply to occasions traditional ways

can't measure as the tester measure the composite value of the grounding body

resistance and grounding down lead resistance.

UT276A 278A clamp-on ground resistance tester is the medium and high-end

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

Product in the UT270 clamp-on ground series, its uniqueness are:

No long time waiting for start up, enter into testing immediately .

The only one clamp-on ground resistance meter with RS232 port, uploading the

stored data to PC.

A breakthrough of the relay self-checking method, adopt the advance arithmetic

and digital IC processing techniques.

Solving the bulkiness of old product, and meeting the portable meter property .

Add the sound-light alarm function with beep--beep--beep--

Add the recognition indication function of interference signal with beep--beep--

beep-- .

Measurement scope has increased to 0.01 -1200 .

With 99-group storage data, lower energy consumption, and with working current

less 50mA in maximum start up.

III Unpack and Check

Unpack and take out the instrument, please check carefully if the following

attachment are complete or intact, if any lack or damage were found, please

contact with your supplier .

Meter

Test ring

Data up-loading software disk

RS232 communication wire

R6 AA size dry batteries

Meter box

User manual, warranty , qualification certificate

1(1.8m)

A set

Types Measuring

resistance

Measuring

current Storing data RS232 port Warning

function

Yes No

Yes

Yes Yes Yes

Yes Yes Yes Yes

IV Product Specification

1 Series Types

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

2 Range and Accuracy

Measurement mode Measurement Scope Resolution Accuracy

Resistance

*Current

3 Technical Specification

Resistance range

*Current range

Resistance resolution

*Current resolution

Data storage

RS232 port

Communication wire

Sound-light alarm

Scope of alarm critical value

setting

Power

Working temperature and

humidity

LCD

99groups

To upload stored data into the computer for

data analysis.

RS232communication wire with 1.8m long.

beep--beep--beep-- alarm press AL key to

control the on-off status.

Resistance 1-199 *current 1-499mA

6VDC (4 AA dry alkaline batteries )

-20 -55 10 RH-90 RH

4bit LCD digit display dimension

( 47mm 28.5mm)

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

50/60Hz (automatic)

Resistance measurement

frequency

Single measurement time

Outside magnetic field and

electric field

Full automatic shift

Structural characteristic Clamp CT

Double insulationProtection rate

Length, width and height 285mm 85mm

56mm

Clamp surface dimension

Clamp surface mass 1160g (inclusive of battery)

Clamp jaw stretch size

Clamp jaw dimension

65mm 32mm

28mm

Shift

40A/m 1V/m

0.5s

1KHz

*Frequency of the current

being measured

V Clamp Meter Structure

1 Long clamp head: 65 32mm

2 Trigger: control the closure and open

of clamp jaw

3 Function keys

ke key: (described as key POWER)

power on and off/exit

SAVE key: data inquiry/wipe data

AL alarm function key: alarm function

on/off

Left/right arrow key: resistance/current

mode conversion

4 HOLD key: hold/unhold display/store

5 LCD

6 RS232 port

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

10 11

VI Liquid Crystal Display

1 Liquid Crystal Display

Alarm symbol

Battery low voltage symbol

Full stored data symbol

Data inquiry symbol

Number of 2-bit stored data group

Current, voltage unit symbol

Resistance unit symbol

Noise signal

Data hold symbol

Clamp jaw open symbol

DC symbol

Decimal point

4-bit LCD digital display

(14). AC symbol

2 Instruction for Special Symbol

(2)Er power-on error symbol. It might be caused by the dirtiness of the

clamp jaw, please clean the clamp jaw surface.

(4)OL symbol, it means the resistance being measured exceeds the upper

limit of the clamp meter.

(5)L0.01 symbol, it means the resistance being measured exceeds the

lower limit of the clamp meter.

(6)OL A symbol, it means the current being measured exceeds the upper

limit of the clamp meter.

indicates that it might be artificial pull-off the trigger; or the clamp jaw has

been too dirty to measure, requiring clamp jaw cleaning.

(1) clamp jaw open symbol. It shall display when the clamp jaw is open. It

the symbol would appear and replace battery in time or the measurement

accuracy couldn't be guaranteed.

(3) battery low voltage symbol. When the battery voltage is lower than 5.3V ,

it will flicker and the meter will sound sporadic beep--beep--beep-- .

(7) Alarm symbol, when the measured value exceed the alarm critical value,

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

12 13

(8)MEM full stored data symbol, when the stored data has reached 99 groups

and can't store data anymore, the symbol MEM shall flicker.

Of stored data.

(9)MR Data inquiry symbol, it shall appear in inquiring data and indicate the No.

loop being measured, the symbol shall flicker and the meter sound sporadic

beep--beep--beep-- , the measurement accuracy of the time can't be

guaranteed.

(10)NOISE Symbol, when there are quite big interference current to the earth

3 Display Demonstration

(1)as clamp jaw is open, it can't measure.

(It might be caused by the dirtiness of

the clamp jaw, please clean the clamp

jaw surface.)

power-on error indication Er(Error)

(It might be caused by the dirtiness

of the clamp jaw , please clean the

clamp jaw surface.)

resistance of the loop being

measured <0.01

resistance of the loop being

measured is 5.1

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

14 15

(5)resistance of the loop being

measured is 2.1,

hold the present measurement

value 2.1,

store automatically as the No.08

group data.

(6)inquiry the No.26group stored data

resistance of the loop being

measured is 0.028

(7)start alarm function and the current

being measured exceed the set

alarm critical value

battery low voltage display and the

measurement accuracy can't be

guaranteed.

current being measured is: 8.40A

hold the present display value

store the present hold value as the

No 37 group data.

(8)inquiry No 08 group stored data

resistance being measure is: 30.0

the data is measured under strong

interference signal

UT276A/278A OPERATING MANUALUT276A/278A OPERATING MANUAL

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