Mastech MS2108A Operation Manual

AC/DC

DIGITA CLAMP METER

OPERATION MANUAL

CONTENTS

1. SAFETY INFORMATION ……1

1.1 PRELIMINARY ……1

1.2 DURING USE ……2

1.3 SYMBOLS ……3

1.4 MAINTENANCE ……3

2. DESCRIPTION ……4

2.1 NAMES OF PARTS ……5

2.2

SWITCH, BUTTONS AND INPUT JACKS ……8

2.3 LCD (Liquid-crystal display) ……8

3. SPECIFICATIONS ……10

3.1 GENERAL SPECIFICATIONS ……10

3.2 TECHNICAL SPECIFICATIONS ……11

4. OPERATION INSTRUCTION ……16

4.1 HOLDING READINGS ……16

4.2 SWITCHING REL ……16

4.3 SWITCHING FREQUENCY OR DUTY ……17

4.4 SWITCHING

MAXIMUM OR

MINIMUM VALUE

……17

4.5 SWITCHING FUNCTIONS ……18

4.6 BACK LIGHT AND

CLAMP LIGHTING

BULB

……18

4.7 AUTO POWER OFF ……19

4.8 PREPARING FOR MEASUREMENT ……19

4.9 MEASURING AC CURRENT ……20

4.10 MEASURING DC CURRENT ……21

CONTENTS

4.11 MEASURING AC VOLTAGE ……23

4.12 MEASURING DC VOLTAGE ……24

4.13 MEASURING FREQUENCY ……26

4.14 MEASURING DUTY ……29

4.15 MEASURING RESISTANCE ……33

4.16 TESTING DIODE ……35

4.17 TESTING CONTINUITY ……36

4.18 MEASURING CAPACITANCE ……37

5. MAINTENANCE ……39

5.1 REPLACING THE BATTERIES ……39

5.2 REPLACING TEST LEADS ……39

6. ACCESSORIES ……39

1. SAFETY INFORMATION

WARNING

BE EXTREMELY CAREFUL WHEN USING THIS

METER. Improper use of this device can result in electric

shock or destruction of the meter. Take all normal safety

precautions and follow the safeguards suggested in this

manual.

To exploit full functionality of the meter and ensure safe

operation, please read carefully and follow the directions in

this manual.

This meter has been designed according to IEC-1010 concerning

electronic measuring instruments with an overvoltage category

CAT ΙΙΙ 600V and pollution 2.

Follow all safety and operating instructions to ensure safe use of

the meter.

With proper use and care, this digital multimeter will give you

years of satisfactory service.

1.1 PRELIMINARY

1.1.1 When using the meter, the user must observe all normal safety

rules concerning:

- General protection against electric shock

- Protection of the meter against misuse

1.1.2 When the meter is delivered, check whether it has been

damaged in transit.

1.1.3 After being stored and delivered under harsh conditions, the

meter should be checked and confirmed whether any damages

- 1 -

have been incurred.

1.1.4 Test leads must be kept in good condition. Before using check

whether the insulation on test leads has been damaged and any

wire has been exposed.

1.1.5 Use the test leads supplied to ensure operation safety. If

required, they must be replaced with test leads of the same

model or class.

1.2 DURING USE

1.2.1 Use the right input jack, function and range.

1.2.2 Do not take measurements that exceed the protection limit

values indicated in the specifications.

1.2.3 Do not touch the metal tips of the test leads when the meter is

connected to the circuit to be measured.

1.2.4 Keep your fingers behind the probe barriers when taking a

measurement with an effective voltage above 60V DC or 30V

rms AC.

1.2.5 Do not take voltage measurement if the value between the

terminals and earth ground exceeds 600V.

1.2.6 Select the highest range if the value scale to be measured in

the manual range is unknown.

1.2.7 Disconnect the test leads from the circuit under test before

turning the rotary selector to change functions.

1.2.8 Do not measure the resistance，capacitance, diode or

continuity of live circuits.

1.2.9 Do not connect the meter to any voltage source while the

rotary selector is in the current, resistance, capacitance, diode

or continuity range.

- 2 -

1.2.10 Do not take capacitance measurements until the capacitor to

be measured has been fully discharged.

1.2.11 Do not use the meter near explosive gases, steam or dirt.

1.2.12 Stop using the meter if any abnormalities or faults are

observed.

1.2.13 Do not use the meter unless its rear case and battery cover is

securely fastened in its original position.

1.2.14 Do not store or use the meter in areas exposed to direct

sunlight, at high temperature or with high relative humidity.

1.3 SYMBOLS

Caution, risk of danger (Important safety information; refer

to the operation manual.)

Application around and removal from HAZARDOUS

LIVE conductors is permitted.

Double insulation（Protection class II）.

CAT III Overvoltage (Installation) category III, Pollution

Degree 2 per IEC1010-1 refers to the level of Impulse

Withstand Voltage protection provided.

Conforms to European Union Directive

Earth (ground) terminal

1.4 MAINTENANCE

1.4.1 Do not attempt to remove the rear case to adjust or repair the

meter. Such actions should only be performed by a technician

who fully understands the meter and the danger involved.

1.4.2 Before opening the case and battery cover of the meter,

always disconnect test leads from all sources of electric

-3 -

current. Disconnect the test leads from all sources of electric

current before opening the rear case and battery cover of the meter.

1.4.3 To avoid any electric shock caused by error readings, replace

the batteries immediately when the “ ” sign appears on the

display.

1.4.4 Use damp cloth and mild detergent to clean the meter; do not

use abrasives or solvents.

1.4.5 Turn the rotary selector to OFF position to switch off the

power when the meter is not in use.

1.4.6 Remove the batteries to avoid damages to the meter if it will

idle for a long time.

2. DESCRIPTION

- This meter is a portable professional measuring instrument with

LCD and back light easily reading. The ‘single-hand operation’

design for the range switch makes measurement simple and easy.

Overload protection and low battery indication are provided. It

is an ideal multi-function Instrument with scores of practical

applications for professional, workshop, school, hobby and

home use.

- The meter can perform measurements of AC/DC voltage and

current, resistance，frequency, duty, capacitance, as well as

continuity and diode test.

- auto range is available.

- This meter is equipped with reading hold function.

- This meter is equipped with square value measuring function (at

AC A and AC V range).

- This meter is equipped with auto zero function (at DCA range).

- This meter is equipped with maximum value measuring

- 4 -

function.

- This meter is equipped with minimum value measuring

function.

- This meter can measure frequency by clamp.

- This meter has function of auto power off.

2.1 NAMES OF COMPONENTS

⑴

Current Clamp

⑵

Clamp Lighting Bulb

⑶

Panel

⑷

Trigger

⑸

Function Switch Button (SEL)

⑹

MAX/MIN Switch Button (MAX/MIN)

⑺

Relative Switch Button (REL)

⑻

Liquid Crystal Display (LCD)

⑼

COM Jack

⑽

Input Jack

⑾

Hz/Duty Switch Button (Hz/%)

⑿

Reading Hold/Back Light Button (HOLD/B.L)

⒀

Rotary selector

⒁

OFF - power switch

⒂

“+” Symbol

⒃

“-” Symbol

⒄

Rear Case

⒅

Fixing Screw of Battery Cover

⒆

Battery Cover

- 5 -

- 6 -

- 7 -

2.2 SWITCH, BUTTONS AND INPUT JACKS

HOLD/B.L Button

- For holding the reading or control backlight

SEL Button

- For switching among measuring functions

REL Button

- The key is the relative value measurement.

Hz/% Button

- For switching between frequency and duty measuring functions.

MAX/MIN Button

- For switching between maximum and minimum value

measuring function.

Rotary Selector

- For selecting functions and ranges.

OFF Position

- for turning off the power.

INPUT Jack

- For measuring voltage, resistance, frequency, duty, capacitance,

diode, and continuity.

COM Jack

- Common input connection for current, voltage, resistance,

frequency, duty, capacitance, diode, continuity measurement.

Clamp

- For measuring current

2.3 LCD (Liquid-crystal display)

- 8 -

ALTERNATING CURRENT

Direct current

Diode test

Continuity buzzer

AUTO Auto range mode

MAX The maximum value is being measured

MIN The minimum value is being measured.

REL DCA zero and relative measure

Aotu power off

Battery low

This indicates that the display data is being

held.

% Percent (Duty cycle)

mV, V Milli-volts, Volts (Voltage)

A Amperes (Current)

nF, µF Nanofarad，Microfarad

Ω,kΩ, MΩ Ohms,Kilo-ohms,Mega-ohms (Resistance)

Hz, kHz,MHz Hertz, Kilo-hertz (Frequency)，Milohertz

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3. SPECIFICATIONS

Calibration is required once a year, to be carried out at a

temperature between 18°C and 28 °C (64°F to 82°F) and relative

humidity below 75%.

3.1 GENERAL SPECIFICATIONS

3.1.1 Auto range.

3.1.2 Overrange protection is provided for all ranges.

3.1.3 Maximum voltage between terminals and earth ground:

1000V DC or 750V rms AC

3.1.4 Operating altitude: max. 2000 meters (7000 ft.)

3.1.5 Display: 4000 counts with analog bar LCD display

3.1.6 Maximum value display: 4000 digits

3.1.7 Polarity indication: automatic; ‘-‘ for negative polarity.

3.1.8 Overrange indication: ‘0L’ or ‘-0L’

3.1.9 Converter Rate: 3 times/sec; Bar graph: 30 times/sec.

3.1.10 Unit indication: function and unit.

3.1.11 Auto power off time: 15 minute.

3.1.12 Operating power : 1.5V×3 AAA batteries

3.1.13 Battery low indication: ‘ ’ on LCD

3.1.14 Temperature factor: < 0.1×Accuracy /℃

3.1.15 Operating temperature: 0℃ to 40

℃

（

32°F to 104°F）

3.1.16 Storage temperature: -10℃ to 50

℃

（

10°F to 122°F）

3.1.17 Dimension: 208×78×35mm

3.1.18 Weight: approximate 340g（including batteries）

- 10-

3.2 ELECTRICAL SPECIFICATIONS

Ambient temperature: 23±5℃ Relative humidity: < 75%

3.2.1 AC Current

Range Resolution Accuracy

40A 0.01A ±（2.0% of rdg + 6 digits）

400A 0.1A

- Max. input current: 400A AC

- Frequency range: 40 to 400Hz

- Response: average value

3.2.2 DC Current

Range Resolution Accuracy

40A 0.01A ±（2.0% of rdg + 6 digits）

400A 0.1A

- Max. input current: 400A DC

3.2.3 DC Voltage

Range Resolution Accuracy

400mV 0.1mV ± (1 .0% of rdg + 2digits)

4V 0.001V

40V 0.01V ± (0.7% of rdg + 2digits)

400V 0.1V

1000V 1V ±（0.8%rdg+2dgt）

- Input impedance: 10MΩ

- Max. input voltage: 1000V DC

NOTE:

At small voltage range, unsteady readings will appear before the

- 11-

test leads contact the circuit. This is normal because the meter is

highly sensitive. When the test leads contact the circuit, the true

reading will be shown.

3.2.4 AC Voltage

Range Resolution Accuracy

4V 0.001V

± (0.8% of rdg + 3digits)

40V 0.01V

400V 0.1V

750 1V ± (1% of rdg + 4digits)

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

- Frequency range: 40 to 400Hz

- Response: average value

3.2.5 Frequency

3.2.5.1 By A range ( from current clamp):

Range Resolution Accuracy

10Hz 0.01Hz

±（1.5% of rdg + 5 digits）

1kHz 0.001KHz

>1kHz 0.001KHz

- Measurement range: 10 ~ 1kHz

- Input current range: ≥4A rms AC (higher input current at higher

frequency)

- Max. Input current: 400A rms AC

3.2.5.2 By ACV range:

- 12 -

Range Resolution Accuracy

10Hz 0.01Hz

1kHz 0.001kHz ±（1.5% of rdg + 5 digits）

10kHz 0.01kHz

>10kHz 0.01kHz Take it only as referance

- Measurement range: 10 ~ 10kHz

- Input voltage range: ≥ 0.6V rms AC (higher input voltage at

higher frequency)

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

3.2.5.3 By Hz/DUTY range

Range Resolution Accuracy

9.999Hz 0.001Hz

±（0.5% of rdg+3 digits）

99.99Hz 0.01Hz

999.9Hz 0.1Hz

9.999KHz 0.001 KHz

99.99KHz 0.01 KHz

999.9KHz 0.1 KHz

9.999MHz 0.001MHz

- Overload protection: 250V dc or 250V ac rms.

- Input Voltage range: 200mV-10V ac rms

3.2.6 Duty Cycle

Range Resolution Accuracy

0.1% - 99% 0.1% ± 3.0%

3.2.6.1 By A range ( from current clamp):

- Frequency response: 10 ~1kHz

- Input current range: ≥4A rms AC

- Max. input current: 400A

3.2.6.2 By ACV range:

- 13 -

- Frequency response: 10 ~ 10 kHz

- Input voltage range: ≥ 1 V rms AC

- Input impedance: 10MΩ

- Max. input voltage: 750V rms AC

3.2.6.3 By Hz/DUTY range

- Frequency response: 1 ~ 10MHz

- Input voltage range: ≥ 500mV rms

- Overload protection: 250V rms AC

3.2.7 Resistance

Range Resolution Accuracy

400Ω 0.1Ω

± (0.8% of rdg + 3digits)

4kΩ 0.001kΩ

40kΩ 0.01kΩ

400kΩ 0.1kΩ

4MΩ 0.001MkΩ

40MΩ 0.1MΩ ± (1.2% of rdg + 3digits)

- Open circuit voltage: 0.4V

- Overload protection: 250V DC or rms AC

3.2.8 Diode

Range Resolution Function

0.001V Displaying approximate forward

voltage of diode

- Forward DC current ~ 1mA

- Reversed DC voltage ~ 3.3V

- Overload protection: 250V DC or rms AC

- 14 -

3.2.9 Continuity

Range Resolution Function

0. 1Ω Built-in buzzer will sound, if

resistance is lower than 40Ω.

- Open circuit voltage ~ 1.2V

- Overload protection: 250V DC or rms AC

3.2.10 Capacitance

Range Resolution Accuracy

40nF 0.01nF

400nF 0.1nF

4µF 0.001µF ±（4.0% of rdg + 5 digits）

40µF 0.01µF

400µF 0.1µF

4000µF 1µF

- Overload protection: 250V DC or rms AC

- 15 -

4. OPERATION INSTRUCTION

4.1 HOLDING READINGS

4.1.1 Press the “HOLD/B.L” button to hold the readings while

taking measurement and the value on the display will be held.

4.1.2 Press the “HOLD/B.L” button again to release the reading

hold function.

4.2 SWITCHING REL

1) REL key is the relative value measurement communication

transmission key that acts with trigger. Press this key will enter into

the relative value measurement mode. The system will save the

display value in the memory as the reference value. When doing the

measurement later, the display value will be the difference value

that the entry value deducts the reference value.

2) Press REL△ key will enter into the Manual Measurement Mode

automatically.

3) In REL△ measurement status, press the key again, the REL△

function will be relocked.

4) Press the key in HOLD status, HOLD function will be cancelled.

The system will save the display value in the memory as the

reference value. When doing the measurement later, the display

value is the difference that the entry value deducts the reference

value.

5) Press SELECT Key or use Mode Switch will cancel REL∆

- 16 –

measurement mode, and go back to the normal mode (REL∆ will

disappear in the LCD).

6) OL triggering: Under REL△ mode, OL shows when input value

larger than the allowed value of the measurement mode. Press the

key again, the relative measurement function will be cancelled.

Disable to enter REL△ mode when OL shows.

7) No analog section bar function under REL△ mode.

4.3 SWITCHING FREQUENCY OR DUTY

4.3.1 During working at the voltage or current ranges, press the

“Hz/%” button one time, frequency of the voltage or current

will be measured. Press the “Hz/%” button twice, the meter

will be changed into the duty range for measuring the duty

cycle of the voltage or current. At the same time, the meter is

changed into manual mode.

4.3.2 Press the "Hz/%" button again, meter will be back to the

condition of the voltage or current measuring.

NOTE:

During working at maximum or minimum value measuring

function, the meter can’t be changed into frequency or duty cycle

measuring mode.

4.4 SWITCHING MAXIMUM OR MINIMUM VALUE

4.4.1 At all ranges, press the "MAX/MIN" button one time, the

meter can be set to maximum value measuring mode; press

the button twice, the meter can be set to minimum value

measuring mode; press the button three times, the meter will

get back to normal test mode, and the maximum and

- 17 –

minimum value will be recorded by the chip.

4.4.2 Press the ”MAX/MIN” button more than two second , the

meter will get back to normal test.

NOTE:

1) During measuring maximum or minimum value, the meter will

be set to manual mode automatically.

2) During working at frequency or duty measuring function, the

meter can’t be changed into maximum or minimum value

measuring mode.

4.5 SWITCHING FUNCTIONS

1) SELECT Key is a function selection key that acts with trigger.

Press the key can choose the needed measurement mode: To

choose DC or AC in DC/AC status, to choose Diode or Buzzer

in Diode/Buzzer status, to choose Ohm, Cap, Diode or Buzzer

in Ohm/Cap/Diode/ Buzzer status.

2) Press the key then turn on the power, the Auto Power-off

function will be cancelled, the signal “APO”disappears in

LCD, and enter into Sleep Status (Power-Off). Press the key

then power on will have the Auto Power-Off function.

4.6 BACK LIGHT AND CLAMP LIGHTING BULB

4.6.1 Press the ”HOLD/B.L” button for two or more seconds to

switch on the back light if the light in the environment is too

dim for taking reading, which will last for 15 seconds.

4.6.2 During the back light is working, press the “HOLD/B.L”

button for two or more seconds, it will be turned off.

4.6.3 At the current range, when the back light is switched on, the

clamp lighting bulb will be turned on at the same time.

- 18 –

NOTE:

- LED which requires a larger working current, is the main source

of back light. Although the meter is equipped with a timer set at

about 15 seconds (i.e. the back light will be off automatically

after about 15 seconds), frequent use of the back light will

shorten the life of the batteries. Therefore, do not use the back

light unless necessary.

- When the battery voltage is ≤3.7V, the symbol “ ”（battery

low）will appear on the LCD. When the back light is on, even

if the batter is ≥3.7V, the “ ” may appear because of its

large working current which will cause the voltage to drop. (The

accuracy of the measurement cannot be assured when the “

“ symbol appears.) In this case, you need not replace the

batteries yet. Normally, the batteries can last until the “ ”

appears when the back light is not being used.

4.7 AUTO POWER OFF

4.7.1 If the mode switch or keys of the meter is no action within 15

minutes, the system will power off automatically (sleep mode). In

Auto Power-off status, press any key, the meter will “Auto

Power-On” (Operation Mode)

4.8 PREPARATING FOR MEASUREMENT

4.8.1 Switch on the power by turning the rotary selector. If the

battery voltage is lower than 3.7V, the “ ” symbol will

appear and the batteries should be replaced.

4.8.2 The “ ” symbol shows that the input voltage or current

should not exceed the specified value in order to protect the

internal circuit from damage.

- 19 –

4.8.3 Turn the rotary selector to the required function and range to

be measured.

4.8.4 Connect the common test lead first and then the charged test

leads when making connection. Take away the charged test

lead first when disconnecting.

4.9 MEASURING AC CURRENT

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter

before making current clamp measurements.

4.9.1 Set the rotary selector to the 40A or 400A range position.

4.9.2 push the REL key make sure the LCD display zero if the

unsteady reading appear before measurement.

4.9.3 Press the trigger to open jaw. Fully enclose only one

conductor.

4.9.4 Take the reading on the LCD.

NOTE:

1) Do not put more than one cable into the jaw during test,

otherwise incorrect test value might be obtained.

2) For optimum results, center the conductor in the jaw.

3) At the manual range mode, when only ‘OL’ is shown on the

LCD, it means the measurement has exceeded the range. A

higher range should be selected.

4) If the scale of the value to be measured is unknown beforehand,

set the range to the highest.

5) “ ” means the maximum input current is 400A rms AC.

- 20 -

4.10 MEASURING DC CURRENT

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter

before making current clamp measurements.

4.11.1 Set the rotary selector to the 40A or 400A range position.

4.11.2 Press the SEL key turn to DC current measurement mode..

4.11.3 Press the "REL" button, the meter will be set to zero.

4.11.4 Press the trigger to open jaw. Fully enclose only one

conductor.

4.11.5 Take the reading on the LCD.

4.11.6 Symbol “-” will be displayed on LCD if the direction of the

current is negative.

NOTE:

1) Do not put more than one cable into the jaw during test,

otherwise incorrect test value might be obtained.

2) For optimum results, press the "REL" button to make the

meter get into zero first.

3) For optimum results, center the conductor in the jaw.

4) At the manual range mode, when only ‘OL’ or ‘-OL’ is shown

on the LCD, it means the measurement has exceeded the range.

A higher range should be selected.

5) Under the manual range mode, when the scale of the value to

be measured is unknown beforehand, set the range to the

highest.

6) “ ” means the maximum input current is 400A DC.

- 21 -

- 22 -

4.11 MEASURING AC VOLTAGE

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when

measuring high voltage.

Do not input the voltage which more than 750V rms AC.

4.12.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.12.2 Set the rotary selector to position to make the meter

get into AC V range.

4.12.3 Connect the test leads to the voltage source or load terminals

for measurement.

4.12.5 Take the reading on the LCD.

NOTE:

1) “ ” means the maximum input voltage is 750V rms AC.

2) If the test result is more than 750V rms AC, symbol “OL” will

be displayed on LCD and the build-up buzzer will sound.

- 23 -

Correct Incorrect

4.12 MEASURING DC VOLTAGE

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring

high voltage.

Do not input the voltage which more than 1000V DC.

4.13.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.13.2 Set the rotary selector to at the V range position.

4.13.3 Connect the test leads to the voltage source or load terminals

for measurement.

4.13.4 Take the reading on the LCD.The polarity symbol denotes

-24 -

the polarity of the end connected by the red test lead.

NOTE:

1) At small voltage range, unsteady readings will appear before

the test leads contact the circuit. This is normal because the

meter is highly sensitive. When the test leads contact the

circuit, the true reading will be shown.

2) “ ” means the maximum input voltage is 1000V DC.

3) If the test result is more than 1000V DC, symbol “OL” will be

displayed on LCD and the build-up buzzer will sound.

- 25 -

4.13 MEASURING FREQUENCY

4.13.1 By A range (from current clamp):

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter

before making current clamp measurements.

4.13.1.1 Set the rotary selector to the A range ( A or A )

position.

4.13.1.2 Press the trigger to open jaw. Fully enclose only one

conductor.

4.13.1.3 Press the "Hz/%" to switch to the frequency measurement.

4.13.1.4 Take the reading on the LCD.

NOTE:

1) Do not put more than one cable into the jaw during test,

otherwise incorrect test value might be obtained.

2) Frequency test range is 10Hz - 1kHz. ‘00.0’ will be displayed

on LCD if the test frequency is lower than 10.0 Hz. It is

possible to test the frequency which is higher than 1 kHz but

the tolerance of the test result can not be ensure.

3) “ ” means the maximum input current is 400A rms AC.

- 26 -

4.13.2 By V range:

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring

high voltage. Do not input the voltage which more than

750V rms AC.

4.13.2.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.13.2.2 Set the rotary selector to the range position.

4.13.2.3 Press the "Hz/%" key to switch to frequency

measurement.

4.13.2.4 Connect test leads to the two ends of the source or load for

measurement.

4.13.2.5 Take the reading on the LCD.

NOTE:

- 27-

correct incorrect

1) Frequency test range is 10Hz -10kHz. It is possible to test the

frequency which is higher than 10kHz but the tolerance of the

test result can not be ensure.

2) “ ” means the maximum input voltage is 750V rms AC.

4.13.3 By HZ/DUTY range:

WARNING

Beware of Electrocution. Pay special attention to avoid

electric shock when measuring high voltage. Do not input

the voltage which more than 250V rms AC.

4.13.3.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.13.3.2 Set the rotary selector to the HZ/DUTY range position.

4.13.3.3 Connect test leads to the two ends of the source or load for

measurement.

4.13.3.4 Take the reading on the LCD.

- 28 -

4.14 MEASURING DUTY

4.14.1 By A range ( from current clamp):

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter

before making current clamp measurements.

4.14.1.1 Set the rotary selector to the A range position.

4.14.1.2 Press the trigger to open jaw. Fully enclose only one

conductor.

4.14.1.3 Press the "Hz/%" to switch to the DUTY measurement.

4.14.1.4 Take the reading on the LCD.

NOTE:

1) Do not put more than one cable into the jaw during test,

otherwise incorrect test value might be obtained.

2) If the duty cycle is less than 10%, symbol ‘UL’ will be

displayed on LCD; if the duty cycle is more than 94.9%,

symbol ‘OL’ will be displayed on LCD.

3) The input signal frequency range is 10 – 1kHz. It is possible to

test duty cycle of the higher than 1 kHz frequency signal, but

the tolerance of the test result can not be ensure.

4) “ ” means the maximum input current is 400A rms AC.

- 29 –

4.14.2 By V range:

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring

high voltage.

Do not input the voltage which more than 750V rms AC.

4.14.2.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.14.2.2 Set the rotary selector to the range position.

4.14.2.3 Press the "Hz/%" to switch to DUTY measurement.

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4.14.2.4 Connect test leads to the two end of the source or load for

measurement.

4.14.2.5 Take the reading on the LCD.

NOTE:

1) If the duty cycle is less than 10%, symbol ‘UL’ will be

displayed on LCD; if the duty cycle is more than 94.9%,

symbol ‘OL’ will be displayed on LCD.

3) The input signal frequency range is 10 – 10 kHz. It is possible

to test duty cycle of the higher than 10 kHz frequency signal,

but the tolerance of the test result can not be ensure.

3) “ ” means the maximum input voltage is 750V rms AC.

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Correct Incorrect

4.14.3 By HZ/DUTY range:

WARNING

Beware of Electrocution. Pay special attention to avoid

electric shock when measuring high voltage. Do not input

the voltage which more than 250V rms AC.

4.14.3.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.14.2.2 Set the rotary selector to the HZ/DUTY range position.

4.14.2.3 Press the "Hz/%" to switch to DUTY measurement.

4.14.2.4 Connect test leads to the two end of the source or load for

measurement.

4.14.2.5 Take the reading on the LCD.

NOTE:

1) If the duty cycle is less than 10%, symbol ‘UL’ will be

displayed on LCD; if the duty cycle is more than 99.9%,

symbol ‘OL’ will be displayed on LCD.

3) The input signal frequency range is 10 – 10 kHz. It is possible

to test duty cycle of the higher than 10 kHz frequency signal,

but the tolerance of the test result can not be ensure.

3) “ ” means the maximum input voltage is 750V rms AC.

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4.15 MEASURING RESISTANCE

WARNING

Beware of Electrocution.

When measuring in-circuit resistance, make sure that the

power of the circuit under test has been turned off and that

all capacitors have been fully discharged.

4.15.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.15.2 Set the rotary selector to the range position to make

the meter get into Ω range.

4.15.3 Connect the test leads to the ends of the resistor or circuit for

measurement.

4.15.4 Take the reading on the LCD.

NOTE:

1) When the input is open, ‘OL’ will appear on the LCD to

indicate that the range has been exceeded.

2) For measuring resistance above 1MΩ, it may take a few

seconds to get a steady reading. This is normal for high

resistance reading.

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4.16 TESTING DIODE

4.16.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.16.2 Set the rotary selector to the range position.

4.16.3 Press the "SEL" button to switch to test.

4.16.4 Connect the red test lead to the anode and the black test lead

to the cathode of the diode for testing.

4.16.5 Take the reading on the LCD.

NOTE:

1) The meter will show the approximate forward voltage drop of

the diode.

2) When the test leads have been reversed or open, ‘OL’ will

appear on the LCD.

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4.17 TESTING CONTINUITY

WARNING

Beware of Electrocution.

Make sure that the power of the circuit has been turned off

and the capacitors have been fully discharged before testing

the continuity of a circuit.

4.17.1 Plug the black test lead into the COM jack and the red test

lead into the INPUT jack.

4.17.2 Set the rotary selector to the range position.

4.17.3 Press the "SEL" button to switch to continuity test.

4.17.4 Connect the test leads to the two ends of the circuit for

measurement.

4.17.5 If the resistance of the circuit being tested is less than 40Ω,

the built-in buzzer will maybe sound.

4.17.6 Take the reading on the LCD.

NOTE:

If the test leads are open or the resistance of the circuit is over

400Ω, “OL” will appear on the LCD.

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4.18 MEASURING CAPACITANCE

WARNING

Beware of Electrocution.

To avoid electric shock, make sure that the capacitors have

been fully discharged before measuring the capacitance of a

capacitor.

4.18.1 Plug the black test lead into the COM jack and the red test

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lead into the INPUT jack.

4.18.2 Set the rotary selector to the range position.

4.18.3 After fully discharged the capacitor, connect the test leads to

the two ends of the capacitor for measurement.

4.18.4 Take the reading on the LCD.

NOTE:

1. It may take some time (about 30 seconds for the 400µF and

4000µF range) for steady readings when measuring high capacity.

2. You must push the key “REL” when measure less than 20 nF.

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5. MAINTENANCE

5.1 REPLACING THE BATTERIES

WARNING

To avoid electric shock, make sure that the test leads have

been clearly move away from the circuit under

measurement before opening the battery cover of the meter.

5.1.1 If the sign “

” appears, it means that the batteries should

be replaced.

5.1.2 Loosen the fixing screw of the battery cover and remove it.

5.1.3 Replace the exhausted batteries with new ones.

5.1.4 Put the battery cover back and fix it again to its origin form.

NOTE:

Do not reverse the poles of the batteries.

5.2 REPLACING TEST LEADS

WARNING

The replacement must be test leads in good working

condition with the same or equivalent rating: 1000V 10A.

A test lead must be replaced if the insulation layer has been

damaged, e.g. the wire inside is exposed.

6. ACCESSORIES

1) Test Leads: Electric Ratings 1000V 10A 1 pair (set)

2) Operating Manual 1 copy

3) 1.5V AAA Battery 3 piece

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HYS006169