Morris Products 57276 User manual

Model 57276

:0.01 1200 CAT II

MEM

AL:1 100

1 99

:600V

EARTH RESISTANCE

CLAMP

USERS MANUAL

1mA 20A

CONTENTS

WARNING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1

MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1

INTRODUCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2

FRATURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2

SUMMARY OF FUNCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

LAYOUT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

LCD DISPLAY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

OPERATION

ON/OFF OPERATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

EARTH RESISTANCE MEASUREMENT - - - - - - - - - - - - - - - - - - - - 7

CURRENT MEASUREMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

HOLD BUTTON - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

ALARM OPERATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

MEMORY FUNCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

SPECIAL FUNCTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

SPECIFICATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

FEATURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

ACCESSORY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

CHANGING THE BATTERIES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

CHARGE THE BATTERIES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

APPLICATION FIELD - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18

WARNING

* Before measuring, note that the metal objects or the conductors that connect with

the electric equipment are dangerous, as well as the earth system. So when you

test the electric equipment, you must especially pay attention to safety.

* The warning letter that is in the back of your instrument reminds you of the values

that must not be exceeded, the measurement ranges, and briefly, the operation

of the clamp.

* Do not exceed the permissible overloads of loop current.

* Before switching the instrument on, you must press the trigger several times to

ensure the clamp is closing correctly.

* When switching on and the clamp it is auto-calibrating, do not open the clamp or

hook the clamp jaw around any conductor.

MAINTENANCE

* Keep the surfaces of the clamp jaw clean, any dirt may cause malfunction of the

clamp.

* Use the soft damp cloth to clean the clamp jaw faces, do not use abrasives,

solvents, or alcohol.

* Avoid any shock, especially the clamp jaw faces.

* Avoid the immediate proximity of metallic masses.

* After each measurement, press the HOLD button to reduce consumption of the

batteries.

* Remove the batteries from the instrument in case of prolonged non-use.

―1 ―

INTRODUCTION

Modern industrial electronic equipment is in quick development. A good

Earth ground is becoming an efficient system to prevent from interference and

thunderbolt. A safe and quick earth tester is most needed.

The Earth resistance clamp is a breakthrough from traditional testers. Neither

the supplementary earth leads nor the break earth equipment is necessary.

Ground resistance results can be safely and quickly obtained only by clamping

the ground line.

Current testing is also provided. This high sensitivity clamp meter

can measure the leakage current to 1mA, neutral current to 20ARMS. It is

especially important for testing ground circuit with strong interference and ripple

that will influence the electrical quality.

In addition to industrial electronic equipment, it is also widely used in the field

of electric power distribution, telecommunication and architectural ground.

FEATURES

☼0.01Ωhigh accuracy for low resistance measurement

☼0.001Ωhigh resolution

☼Record 99 resistance measurement values

☼With alarm function of resistance limit, set alarm threshold in 1Ωto 100Ω

☼Measure leakage current and neutral current 1mA～20A

☼45mm×32mm large jaws of exactitude measurement probe

☼Digital measurement, autorange ,easy operation

☼Double insulation, strengthen the interference resistance

☼Untouched measurement ,ensure the safety

☼Time per measurement : 1 second

☼Current overload display : >20A RMS, display “OL”

―2 ―

SUMMARY OF FUNCTION

FUNCTION BUTTON

ON/OFF/EXIT SET MODE

A MEASUREMENT/ ALARM VALUE INCREASE/

RECORD NUMBER SELECT

▲A

ΩMEASUREMENT/ ALARM VALUE MINISH /

RECORD NUMBER SELECT

▼Ω

HOLD DISPLAY HOLD

SELECT ALARM MODE AL

SELECT /SET MEMORY MODE MEM

SWITCH BUZZER ON/OFF +Ω

SET ALARM VALUE +AL

AUTO POWER OFF FUNCTION SET +HOLD

READ SAVED MEASUREMENT VALUE +MEM

RESET MEMORY TO ZERO HOLD+MEM

LAYOUT

1．Clamp jaw

2．Trigger

3．MEM Button

4．Button（ON/OFF BUTTON ）

5．LCD Display

6．AL Button

7．▼Ω Button

8．▲A Button

9．HOLD Button

―3 ―

LCD DISPLAY

（Note: when switch is on, the clamp performs a rapid auto-test of the whole

display. All the symbols on the LCD are displayed for this short time.）

―4 ―

:0.01 1200 CAT II

MEMAL:1 100

1 99

:600V

EARTH RESISTANCE

1mA 20A

1．Buzzer ON symbol

2．HOLD symbol : holds the last measurement

3．Interference Symbol: shows that the current in the loop is disturbed such that

the resistance measurement value is not guaranteed.

4．Clamp symbol: shows that the clamp is closed incorrectly, cannot measure.

5．Wait symbol: shows that the instrument is auto-calibrating

6．Current measurement unit

7．Resistance measurement unit

8．Decimal points

9．Percent sign of the batteries actual service life

10. Alarm threshold value of resistance unit

11. Digital display of the battery actual service life orAlarm threshold value

―5 ―

141516

2 3 4 5

12. High Alarm symbol

13. LowAlarm symbol

14. Alarm mode symbol

15. Low voltage indication symbol

16. Auto Power Off symbol

17. Record number symbol

18. Read memory mode symbol

19. save in memory mode symbol

20. 4 digit LCD digital display

OPERATION

一、ON/OFF OPERATION

button switches ON/OFF. Press button so the clamp switch is on,

Press the button for 2 seconds, the instrument switches off.

As soon as it switches on, the earth resistance clamp begins to

auto-calibrate to obtain better resolution. When it is calibrating, the instrument

will count from CAL 9 to CAL 0. The user must wait for the clamp to complete

calibration. Do not open the clamp or hook the clamp jaw around the

conductor or the object to be measured during the calibration. After the

calibration is completed, the instrument returns to the measurement mode

when last switch off. If the instrument is in resistance measurement mode

when switch off, the LCD will display the primary resistance measured value.

―6 ―

二、EARTH RESISTANCE MEASUREMENT

1．After switching on, the instrument is automatically in measurement current

mode, you can press the ▼Ω button to configure for resistance

measurement mode.

2．Hook the clamp jaw around earth leads or electrode to be tested.

3．If symbol “ - - - ” and symbol are shown on the display, it indicates

that the clamp is closed incompletely. You must press the trigger of the

instrument several times to close the clamp jaw correctly. After the

symbol disappears from the display, meter is in the normal measurement

mode.

4．Read the measurement value on the display.

5．When the display shows the “NOISE” symbol, it indicates that there is an

interference current in the loop, the resistance measurement may be

innaccurate.

6．Schematic of measurement

·Buzzer ON

·A loop earth resistance of 36.2Ω

·The batteries service life is 87%

―7 ―

·Buzzer ON

·A loop earth resistance of 68.7Ω

·The earth resistance value is above the high alarm

threshold 50Ω, a beep is emitted

·Buzzer ON

·A loop earth resistance of 0.5Ω

·The earth resistance value is less than the low alarm

threshold value 8Ω, a beep is emitted

―8 ―

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