Mastech MS2301 Manuel utilisateur

MS2301

USERS MANUAL

EARTH RESISTANCE CLAMP

CONTENTS CONTENTS

WARNING

MAINTENANCE

INTRODUCTION

FRATURES

SUMMARY OF FUNCTION

LAYOUT

LCD DISPLAY

OPERATION

ON/OFF OPERATION

EARTH RESISTANCE

MEASUREMENT

CURRENT MEASUREMENT

HOLD BUTTON

ALARM OPERATION

MEMORY FUNCTION

SPECIAL FUNCTION

SPECIFICATION

FEATURES

ACCESSORY

CHANGING THE BATTERIES

CHARGE THE BATTERIES

APPLICATION FIELD

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Summary of function

FUNCTION BUTTON

A MEASUREMENT/

A LARM VALUE INCREASE/

RECORD NUMBER SELECT

ON/OFF/EXIT SET MODE

Ω MEASUREMENT/

A LARM VALUE MINISH /

RECORD NUMBER SELECT

HOLD DISPLAY

SELECTA LARM MODE

SELECT /SET MEMORY MODE

SWITCH BUZZER ON/OFF

SET A LARM VALUE

AUTO POWER OFF FUNCTION SET

READ SAVED MEASUREMENT VALUE

RESET MEMORY T O ZERO HOLD+MEM

HOLD

A L

MEM

▲A

▼

+MEM

+HOLD

A L

LCD Display

(Note: when switch on, the clamp performs a rapid

auto-test of the whole display. All the symbol on the

LCD are display for this short time.)

Layout

1. Clamp jaw

2. Tri gger

3. MEM Button

4. Button

(ON/OFF BUTTON)

5. LCD Display

6. AL Button

7. ▼Ω Button

8. ▲A Button

9. HOLD Button

05 06

1． Buzzer ON symbol

2． HOLD symbol : hold the last measurement

3． Interference Symbol : showing that the current in

the loop is disturbed such that the resistance

measurement value is not be guaranteed.

4． Clamp symbol : showing that the clamp is closed

incorrectly, can not measure.

5． Wait symbol : showing 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 or

Alarm threshold value

12. High Alarm symbol

13. Low Alarm 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

1.ON/OFF Operation

button switches ON/OFF. Press button so the

clampswitch on, Press the  button for 2 seconds,

the instrument switch off.

As soon as it switch on, the earth resistance clamp

begins to auto-calibrate to obtain batter resolution.

When it is calibrating, the instrument will count from

CAL 9 to CAL 0. The user must wait for the clamp

completed calibration. Do not open the clamp or hook

the clamp jaw around the conductor or the object be

measured in case of the calibration. After the calibration

completed, the instrument returns 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.

• Buzzer ON

• Aloop earth resistance of 36.2Ω

• The batteries service life is 87%

07 08

2.Earth resistance measurement

1. After switching on, the instrument is automatism 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, then it is in the

normal measurement mode.

4. Read the measurement value on the display.

5. When the display appears the “NOISE” symbol, it

indicates that there is an interference current in the

loop, the resistance measurement is not assured.

6. Schematic of measurement

• 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

09 10

• Buzzer ON

• Read the 22th recorded measurement, the loop

earth resistance of 176.4Ω

• The low alarm threshold of earth resistance set at 15Ω

• Buzzer ON

• A interfered current is in the loop resistance, the

current measured resistance is 55.2Ω, the value

is not guaranteed

• The batteries service life is 86%

• Buzzer ON

• A loop earth resistance of 93.7Ω

• The batteries service life is 18% and less than 20%.The

display appears the low voltage indication

• Auto Power Off function is valid

• 55 recorded values in the memory

• Buzzer ON

• A loop earth resistance of 19.6Ω

• The earth resistance value is less than the high

alarm threshold value 30Ω, no beep is emitted

• 6 recorded values in the memory

11 12

• The clamp jaw is closed incorrectly, ”---” is displayed

• The batteries service life is 90%

3. Current measurement

1. Press the A button on the instrument.

2. The display shows the current unit “A” or “mA”, the

instrument is in

current measurement mode. You can measure current

of the conductor.

3. Read the measurement value on the display.

4. If the display shows symbol “OL” , it indicates the

measured value exceeds the measurement range.

4. Hold button

Press the HOLD button to lock display of the current measure

state and last measurement on measurement mode.

5. Alarm operation

1. On resistance measurement, press the AL button, “AL”

symbol and the value of the alarm threshold are displayed.

2. According to the measurement demand, you can press

“AL” button time after time to select one of three alarm

modes:

---- LOW ALARM MODE: when signals

measurement below the alarm threshold, a continuous

beep at low frequency.

The symbol is displayed.

---- HIGH ALARM MODE: when signals measurement

belowthe alarm threshold, a continuous beep at high

frequency.The symbol is displayed.

---- NO ALARM MODE: signals measurement is not

confined in alarm threshold .

3. Set the alarm threshold

The earth resistance clamp set initial Alarm threshold value

is high alarm threshold of 20Ω. In resistance measurement

mode, press the +Al to set in Alarm threshold value

setting mode, then “AL” symbol and the Alarm threshold

value are displayed; press A or Ω button,you can

increase or decrease the Alarm threshold value, the Alarm

threshold is from 1 to 100Ωinclusive. After switching off the

threshold value is not changed. Setting Alarm threshold

value completed, you can press AL button to select one of

the three Alarm mode: HIGHT ALARM MODE, LOW

ALARM MODE, NO ALARM MODE, when the selection is

completed, you can press the button to exit Alarm

threshold value setting mode.

13 14

6. Memory function

1. Clear memory

Press the HOLD+MEM for 3 seconds, then the “CLR”

symbol is shown on the display. At a beep, the memory

is cleared. The instrument return to measurement mode

automatically.

2. Save measured value

When press the MEM button,the ”MEM” symbol is

displayed; press this button for 2 seconds to save the

current measured value in memory.The number of record

goes up by 1 automatically and is shown on the display,

when the number of the record is 99, if MEM button is

pressed again at this time, a beep is emitted and the

instrument prohibits saving the measurement value.

When the batteries service life is less than 20%, a beep

warns that the saving measured value is prohibited.

3. Read the saving measurements

Press the +MEM for 1 second, then the instrument is

in the read memory mode, the “MR” and “HOLD” symbo

are displayed, the number of the record and the measured

value are shown at one time. To display previous record

or subsequent record in the memory press A button

or Ω button. You can press the button to exit read the

record mode to return resistance measurement mode.

7. Special function

1. Press +Ω button, the buzzer symbol disappears

from the display, the buzzer be switched off and beep

function of pressing button or Alarm function is invalid;

press the +Ω to switch on the buzzer again.

2. ON/OFF Auto Power Off function

Press +HOLD button, the LCD display “P” symbol,

the Auto Power Off function switch on. After no operation

for 5 minutes, the instrument switch off automatically.

Press +HOLD again, then the “P” symbol disappears

from the display, the Auto Power Off function switch off.

To switch off the instrument press the button for 2 seconds.

3. Symbol

When the battery service life is less than 20%,the symbol

is continual displayed, the clamp can not save the measured

value in memory in this case. When the batteries service life

is less than 15%, prompt beeps is continual emitted. After

10 beeps is emitted, the instrument switch off automatically.

4. NOISE Symbol

“NOISE” appears on the display indicate that an interference

current of testing earth resistance is too high, the resistance

measurement is not accurate.

5. Symbol

This symbol indicates that the clamp is close incorrectly

and can not make a measurement.

6. WAIT Symbol

This symbol is shown on the display when the instrument

switch on and begin to auto-calibrate., it is from CAL 9 to

CAL 1 to calibration count.

7. OL Symbol

Measured resistance value exceeds 1200Ωor measured

current value exceeds 20A, this symbol is shown on the

display.

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