USERS MANUAL

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TRUE RMS MULTIMETER

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Contents

1. General Information ......................................................................... 1

1.1 Safety information ..................................................................................... 1

1.1.1 Safety instructions ........................................................................... 1

1.1.2 Safety considerations ..................................................................... 1

1.1.3 Safety symbol: ................................................................................... 3

1.1.4 Maintenance practices for safety .............................................. .3

1.2 Input protection measures ..................................................................... 4

2. A Schematic Diagram for the Meter ............................................... 4

2.1 A Schematic Diagram for the Meter .................................................. .5

Physical appearance ................................................................................ 5

2.2 Description of the symbols on the display unit. ............................. 6

2.3 Description of functional keys .............................................................. 7

2.4 Description of input socket .................................................................... 8

2.5 Accessories ................................................................................................... 8

3. Operational guidelines ..................................................................... 9

3.1 Normal operation ...................................................................................... 9

3.1.1 Hold mode ......................................................................................... 9

3.1.2 Backlight & lighting ........................................................................ 9

3.1.3 Auto power off .................................................................................. 9

3.2 Measurement guidelines ........................................................................ 9

3.2.1 Measurement of AC voltage and DC voltage ........................ 9

3.2.2 Electric resistance measurement ............................................. 11

3.2.3 Diode test ........................................................................................ 11

3.2.4 Beep continuity test ..................................................................... 12

3.2.5 Capacitance measurement ........................................................ 13

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3.2.6 Frequency measurement. ........................................................... 13

3.2.7 Current measurement ................................................................. 14

3.2.8 NCV test (non-contact voltage detection) ........................... 15

3.2.9 Temperature measurement ........................................................ 15

4. Technical parameters ...................................................................... 15

4.1 Overall parameters ................................................................................. 15

4.2 Precision indicator .................................................................................. 16

4.2.1 DC voltage ....................................................................................... 16

4.2.2 AC voltage ....................................................................................... 17

4.2.3 Frequency ......................................................................................... 17

4.2.4 Electric resistance .......................................................................... 17

4.2.5 Diode .................................................................................................. 18

4.2.6 Beeper continuity .......................................................................... 18

4.2.7 Capacitor ........................................................................................... 19

4.2.8 DC current ........................................................................................ 19

4.2.9 AC current ........................................................................................ 20

4.2.10 Temperature .................................................................................. 20

5. Meter maintenance ......................................................................... 20

5.1 General maintenance., .......................................................................... 21

5.2 Battery & fuse replacement. ............................................................... 21

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General Information

1. General Information

This digital multimeter 1s designed and manufactured in compliance with IEC-61010 safety requirements on electronic measuring instruments and hand-held digital multi-meters. It is compliant with IEC-61010 requirements pertaining to 600V CAT IV,

1000V CAT.ill and requirements on pollution degree 2. Please read carefully this Operation Manual and pay attention to safety guidelines before operating this meter.

1.1 Safety information

1.1.1 Safety instructions

* Before operating this meter, the operator must observe all standard safety procedures in the two respects below:

A. Safety procedures against electric shock

B. Safety procedures against unintended use

*

To ensure your personal safety, prease use the test lead that accompanies the meter. Before operating this meter, ensure that the test lead is flawless.

1.1.2 Safety considerations

* When the meter is used in the vicinity of the equipment that produces strong electromagnetic interferences, the reading on the meter will grow unstable and even produce serious errors.

*

Don't operate the meter or pen-shaped meter whose appearance is damaged.

* The safety function of the meter will become null if the meter is not properly operated.

*

The meter must be operated with great care when working in the vicinity of an exposed conductor or bus line.

*

The meter is prohibited from being used in the vicinity of any explosive gas, vapor or dust.

* The measurement must be made with correct input terminals and functions and within the allowable measuring range.

* To prevent the meter from being damaged, the value to be input shall not exceed the extremes allowed by each measuring range.

* When the meter has already been connected to the line being

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General Information

* measured, the operator is prohibited from touching the input terminal that is not in service.

* When the voltage measured exceeds 60Vdc or 30Vac (valid value), the operator shall be careful enough to avoid electric shock.

* When making measurement with a test lead, place your fingers behind its protective ring.

* When switching to another measuring range, be sure that test lead has already been taken off the measured circuit.

*

*

For all DC functions, to prevent potential electric shock as a result of incorrect reading, please first use AC functions to check the absence of any AV voltage. Then, select DC voltage measuring range equivalent to or greater than that for AC voltage.

Before the tests on electric resistance, diode, capacitor or continuity, the operator must cut off the power supply to the circuit to be measured, and discharge all high-voltage capacitors within the circuit to be measured.

*

The eiectric resistance measurement or continuity test cannot be carried out in any live electrical circuit.

*

Before the current measurement, the operator must first examine the protective tube of the meter. Before connecting the meter to the circuit to be measured, the operator must first power off the aforesaid circuit.

*

Before repairing TV sets or measuring power switching circuit, the operator must be careful enough to prevent high amplitude voltage impulse from damaging the meter.

*

This meter uses 4 x 1.SV AA batteries that must be correctly installed into the battery compartment.

When

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which is likely to bring electric shock or personal injury to the operator.

appears, the batteries must be replaced immediately. The

*

In measurement, category III voltage and category IV voltage shall not exceed 1000V and 600V respectively.

* The meter shall not be in service if its case (or part of its case) is dismantled.

General Information

1.1.3 Safety symbol:

The safety symbols that appear on the meter's body and ,n this

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Warning, an important safety symbol. The operator must consult this Operation Manual before using the meter. Unintended use may lead to the damage to the device or its components.

AC (alternating current)

-.,

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DC (direct current)

AC/DC

-

[§]

Ground

Double insulation protection

� Fuse

CE

Compliant with European Union Directive

High voltage warning

CAT.ID

1000V

CAT. IV

600 V over-voltage protection over-voltage protection

1.1.4 Maintenance practices for safety

*

The operator must first pull out the test lead when the meter's case is opened or the battery cover is dismantled.

*

The designated replacement parts must be used at the moment of

* maintenance.

The operator must cut off all relevant power supplies before opening the meter. At the same time, the operator must avoid damage to the meter's elements by ensure that he himself doesn't carry any static.

* The meter can only be calibrated, repaired and maintained by

Schematic diagrams for the meter professionals.

*

When the meter's case is opened, the operator must understand the fact that the presence of some capacitance may promise the dangerous voltages even if the power supply to the meter is cut off.

*

The operator should stop using and maintain the meter immediately if any abnormality has been observed on the meter. The operator must see to it that the meter cannot be in service unless it is proved conforming.

*

When the meter is left idle for a long period, the operator shall remove the battery and place it in a place free from high temperature and humidity.

1.2 Input protection measures

*

The meter can sustain the maximum input voltage of 1000V (DC) or

*

750V (AC) at the moment of voltage measurement.

The meter can sustain the maximum AC voltage of 600V or equivalent voltage (valid value) when the tests on frequency, electric resistance, continuity and diode are carried out.

*

The protective tube (FF600mA/ 250V) is used for protection purpose when µA and mA current measurements are carried out.

2. A Schematic Diagram for the Meter

This meter is a hand-held digital multi-meter with the function of displaying True RMS. it is a large-screen LCD unit with backlight and illumination light functions so that the user can easily recognize reading. It is equipped with the function of overload protection and the indicator of battery under voltage. Either for professionals, factories, schools, enthusiasts or households, it is an ideal multi-functional meter.

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Schematic diagrams for the meter

2.1 A Schematic Diagram for the Meter

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Physical appearance

(!).Non-contact voltage detection area @. Non-contact voltage indicator

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Schematic diagrams for the meter

2�2 Description of the symbols on the display unit

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Symbol a e. .ym o s

Description

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F+1

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To avoid electric shock or personal injury as a result of incorrect reading, promptly replace the battery when the battery under voltage indicator appears.

Auto power off indicator C> -

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High voltage warning

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AC

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Negative input polarity indicator

Input voltage AC

Input voltage DC

Switching on/off test mode

Diode test mode

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Automatic range measurement mode

Data hold mode oc, OF Unit of temperature( ° C: Celsius; ° F: Fahrenheit)

% Duty ratio

NCV Non-contact AC voltage detection mode

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V, mV

A, mA, µA n, kn,

Mn

MkHz mF,µF, nF

Schematic diagrams for the meter

V: mV :

A: mA:

µA: n: k.Q:

Mn:

Hz:

KHz:

MHz:

F: mF:

µF: nF:

Table.l Symbols (Continued)

V: the unit of volt

Millivolt , lxl03 or 0.001 volt.

Ampere, the unit of current.

Milliampere, lxl03 or 0.001

ampere.

Microampere, lxl06 or 0.000001

ampere.

Ohm, the unit of electric resistance.

Kilohm, 1000 Ohm

Megaohm, 1,000,000 ohm.

Hz, the unit of frequency

KHz, lx10 3 Hz.

MHz, lx10 6 Hz or 1000 KHz.

Farad, the unit of capacitance.

Millifarad, lxl03 or 0.001 farad.

Microfarad, lxl06 or 0.000001

farad. nF, lxl09 or 0.000000001 farad.

2.3 Description of functional keys

Key

SEL

HOLD(H)

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Description of functions

SEL keys, e.g.

TEMP position: °C mode or °F mode.

Voltage position or current position:

ACV /DCV ACA/DCA

-...�•>) : Select the diode or beep on-off mode

Press the key to hold the measured value for the current moment Press the key again to cancel this function.

Press this key for more than 2 seconds, the backliqht and the illumination indicator will be

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HZ/%

Schematic diagrams for the meter on; however, long press the key for more than 2 seconds again, you will turn off backlight and illumination indicator. If you don't press the key at all, the function will automatically be disenabled in 15 minutes.

AC voltage or AC current position : Under AC voltage or AC current measuring state, press this key to select ACV /HZ/% or ACA/HZ/% measurement mode.

Frequency position : HZ or % measurement mode.

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2.4 Description of input socket

input socket

VO.Hz%

µAmA lOA

Description

COM

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All public input terminals to be measured are connected to test leads in black or the public output plugs of exclusive multi-function test sockets.

Positive input terminals (connected to a test lead in red) for capacitor measurement, diode measurement, beep on/off test, temperature measurement, voltage measurement, electric resistance, frequency, duty ratio.

µA and mA positive input termi' nal (connected to a test lead in red). lOA positive input terminal (connected to a test lead in red).

2.5 Accessories

• Operation Manual

• Test lead

•K-Type thermocouple

One

A pair

A pair

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Operational guidelines

3. Operational guidelines

3.1 Normal operation

3.1.1 Hold mode

In the hold mode, the reading can be maintained on the display unit. Changing the measurement function position or pressing the key Hold again to exit the hold mode.

Hold mode: entry and exit

1. Press the key "H" and the reading will be held and the symbol "[:::I" will appear on the LCD screen.

2. Press the key "H" again to restore the meter to its status for normal measurement.

3.1.2 Backlight & lighting

The meter is equipped with the functions of backlight and lighting so that the operator can access measurement results· even if he is in a darker place. The backlight function can be enabled or disabled by the steps below:

1. Long press-:+:-key for more than 2 seconds to enable backlight and illumination light.

disabled backlight and illumination light; wait for 15 seconds until the backlight and illumination light are automatically disabled.

3.1.3 Auto power off

If no operations are made in 15 minutes following the initialization, the meter will sound to remind the operator to automatically cut off power _ supply and enter the state of dormancy.

The meter can be rebooted when the operator presses H/ the auto power off mode.

-:+:key in

3.2 Measurement guidelines

3.2.1 Measurement of AC voltage and DC voltage

Operational guidelines

,& To avoid any electric shock and/or damage to the meter, do not attempt a voltage 1neasurement if the voltage

(valid value) is l,OOOV for DC current or 750V for AC current.

To avoid any electric sho,ck and/or damage to the meter, don't attempt to impose between any public terminal and ground any voltage whose valid value is over 1,000V for DC current or 750V for AC current.

The meter provides DC voltage measuring ranges as follows:

600.0mV, 6.000V, 60.00V, 600.0V and 1000V, and AC voltage measuring ranges: 6.000V, 60.00V, 600.0V and 750V.

Measurement of AC voltage or DC voltage ,_

1. Turn the rotary switch to the position

DC/ AC voltage function.

\l, Press "SEL" to switch

2. Connect the test lead in black and test lead in red to COM input socket and V input socket respectively.

3. Use another two ends of the test lead to measure the voltage of the circuit to be measured. (In parallel connection with the circuit to be measured)

4. Read the measured voltage value on LCD screen. When DC voltage measurement is attempted, the display unit will show the voltage polarity of the circuit connected to the pen-shaped meter in red.

Notes:

• Within the measuring range of DC voltage of 600mV and AC voltage of 6V, even if there is no input or no connection to the test lead, the meter will display some information. In this situation, press short circuit "V - O" and "COM" terminal to reset the meter to zero.

• Within the AC voltage function, press the key " HZ/%" to measure the frequency of the AC voltage source ( 40HZ-1KHZ )

• The value of the AC voltage measured with this meter is True RMS

(root mean square). These measurements are accurate for sine wave and other .waves (without DC offset), square wave, triangular wave and step wave.

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Operational guidelines

3.2.2 Electric resistance measurement

.&.

To avoid the meter or the measured equipment from damage, do not attempt a resistance measurement

,the operator has already cut off all power sources for circuit to be measured and fully discharged hi h-volta e ca p

Ohm is the unit of electric resistance (n).

The measuring ranges of electric resistance of this meter are 600.0n,

6.000kn, 60.00kn, 600.0kn, 6.000Mnand 60.00Mn,

Measurement of electric resistance

1. Turn the rotary switch to the n position.

2. Connect the test lead in black and test lead in red to COM input socket and V /ninput socket respectively.

3. Use another two ends of the test lead to measure the electric resistance of the circuit to be measured.

4. Read the measured electric resistance value on LCD screen.

Notes:

• The measured value of the electric resistance of the circuit differs a bit from the rated value of the electric resistance.

• To ensure measurement accuracy, in attempting a low resistance measurement, first put two pen-shaped meters in short circuit and capture the resistance reading of these short circuits. Then subtract the aforesaid reading from the measured resistance.

• At 60Mnposition, you have to wait a few seconds before the reading grow stable. This is quite normal for a high resistance measurement.

• When the meter is in open circuit, the display unit will show "OL" that indicates the measured value is over the measuring range.

3.2.3 Diode test

_&.

To avoid the meter or the measured equipment from a

Operational guidelines has already cut off all power sources for the circuit to be y g

Diode test outside the circuit:

1. Turn the rotary switch to the position+l0

1 >) , Press "SEL 11 to switch +l-or ° 1 >) function o

2. Connect the test leads in black and in red to COM input socket and V /Oinput socket respectively.

3. Connect the test leads in black and in red to the positive and negative poles of the diode to be tested respectively.

4. The meter displays the forward bias value of the diode to be tested. If the polarity of the test lead is reversed, the meter will display 1

1

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A normal diode still produces a forward voltage drop of O.SV to 0.8V; the reverse bias voltage reading depend on the variation in electric resistance of other channels between two pen-shaped meters.

3.2.4 Beep continuity test

&

To avoid the meter or the measured equipment from damage, do not attempt a beep continuity test unless the operator has already cut off all power sources for the circuit to be measured and fully discharged all p

Steps for a continuity test:

1. Turn the rotary switch to the position+f•J))

2. Connect the test lead in black and test lead 1n red to COM input socket and V /n input socket respectively.

3. Use another two ends of the test lead to measure the resistance of the circuit to be measured. If the measured distance is no more than 400, the sensor LED (green indicator) will be on and the beeper will sound continuously. If the measured resistance is between 40nand 600, the sensor LED

(red indicator) will be on.

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OJ>erational guidelines

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To avoid the meter or the ·measured equipment from

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damage, do not attempt a capacitance measurement unless the operator has already cut off all power sources for the circuit to be measured and fully discharged all high-voltage capacitors. Use the DC voltage position to determine that all capacitors have been discharqed.

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The measuring ranges for the capacitance of this meter are 6.000nF,

60.00nF, 600.0nF, 6.000µF, 60.00µF and 600.0µF,6mF,100mF.

Measurement of capacitance:

1. Turn the rotary switch to the position

-t

I-input socket respectively.

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2. Connect the test leads in black and in red to COM input socket and

3. Use another two ends of the test lead to measure the capacitance of the capacitor to be measured, and capture the measured value on LCD screen.

Notes:

• The measurement of a large capacitance requires a given period of stabiliz ation of reading.

• To avoid damage to the meter, the measurement of a capacitor with polarities requires much attention to its polarity.

3.2.6 Frequency measurement

.

.&.

To avoid any electric shock and/or damage to the meter, do not attempt a frequency measurement if the voltage is over 250V for DC current or AC current/valid value).

Frequency measurement:

1. Turn the rotary switch to the position HZ% , Press "Hz%" to switch HZ or% function.

2. Connect the test leads in black and in red to COM input socket and Hz input socket respectively.

3. Use another two ends of the test lead to measure the frequency of the circuit to be measured.

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Operational guidelines

4. Read the measured frequency on LCD screen.

3.2. 7 Current measurement

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Do not attempt a measurement on the current in a circuit, if when the voltage between the open-circuit voltage and the ground is over 250V. If the fuse is blown at the moment of measurement, you are likely to damage the meter or get yourself hurt.

To avoid any damage to the meter or equipment to be measured, do not attempt a current measurement unless you have examined the meter's protective tube. In attempting a measurement, you should use the correct input sockets, function positions and measuring ranges.

When a test lead is inserted into the current input socket, do not put the other end of the test lead in parallel connection with any circuit.

The meter provides DC current measuring ranges as follows: 60µA,

600µA,6mA,60.00mA,600.0mA and 10.00A; and AC current measuring ranges: 60µA,600µA,6mA,60.0mA,600.0mA and 10.00A.

Measurement of current:

1. Turn the rotary switch to the appropriate position , Press "SEL" to switch DC/ AC current function.

2. Connect the test lead in black to COM input socket. Connect the test lead in red to a mA input socket when the measured current is less than 600mA; connect the test lead in red to a lOA input socket when the measured current is 600mA,.., 10A.

3. Disconnection of the circuit to be measured Connect the test lead in black to the end of disconnected circuit (the voltage is lower) and connect the test lead in red to the end of the disconnected circuit (voltage is higher).

4. Connect the power to the circuit and capture the displayed reading. If the display unit only shows "OL ", it means the input is over the selected measuring range. At this moment, turn the rotary switch to a higher measuring range.

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Operational guidelines

Notes:

• Within the AC current function, press the key" HZ/%" to measure the frequency of the AC current source ( 40HZ-1KHZ ) .

3.2.8 NCV test (non-contact voltage detection)

Turn the rotary switch to NCV position, and place the top of the meter approach the conductor. If the meter detects the AC voltage, the indicators for signal density (high, medium and low) will be on in accordance with the detected density, while the beeper will sounds alarms at different frequencies.

Note:

1: Voltage may still remain in the absence of any indication. The operator shall not rely on non contact voltage detector to check the presence of voltage. The detection operation may be affected by various factors, including socket design, insulation thickness and type.

2. When the voltage is input into the meter's input terminal, the voltage sensor LED may be on as a result of induced voltage.

3. External sources of interference (like flashlight and motor) may trigger non-contact voltage detection.

3.2.9 Measuring temperature

Put the range switch at the gear of TEMP. Insert the red plug of the thermocouple into the end of °C, and insert the black plug of the thermocouple into COM socket. Directly read the temperature value from the display screen after the reading is stable.

Notes: The maximum measuring temperature for the K-type thermocouple dispatched at random is 250 °C , and its instant measuring value can reach 300 ° (.

4. Technical parameters

4.1 Overall parameters

• Operating environment:

600V CAT IV and 1000V CAT. m Pollution level: 2

Altitude < 2000 m

Working temperature & humidity: 0-40°( (The requirements will not be considered when temperature is less than

l0 ° C and relative humidity is below 80%).

Storage temperature & humidity: -10-60°C (batteries shall be removed when RH is below 70%).

• Coefficient of temperature: O.lxaccuracy/ 0 c ( < 18 °c or > 28 °C).

• Allowable max voltage between terminal to be measured and ground: 1000V DC or 750V AC (valid value)

• Protection of protective tube: mA position: protective tube

FF 600mA/ 250V; A position protective tube FF lOA/ 250V

• Rotation rate: approximately 3 revolutions/second

• Display unit: 6000 counts displayed on LCD screen. Automatically display the symbol for unit in accordance with measurement function position.

• Outrange indication: the LCD screen will display "OL".

• Battery Low indication:

"F +I"

will appear when the battery's voltage is below the normal working voltage.

• Input polarity indication: "-" will automatically appear.

• Power: 4 x l.SV AA battery

• Dimensions: 190 mm(L)x89mm(W)x50mm(H).

• Weight: approximately 380g (inclusive of batteries)

.

4.2 Precision indicator

Accuracy: +(% reading + digit) The accuracy warranty will run for 1 year upon the ex-factory date.

Reference conditions: ambient temperature is between l8 and relative humidity is no more than 80%.

° C and 28 ° C

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Measuring range

600mV

6V

60V

600V

1000V

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Resolution

O.lmV

lmV lOmV lOOmV lV

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Input impedance:lOMn

Maximal input voltage: lOOOVdc or 750Vac valid value

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Measuring range

6V .

Resolution Accuracy

60V

600V lmV lOmV lOOmV

± ( 0.8% readings +3 digits )

750V lV

± ( 1 % readings + 10 digits )

Input impedance:lOMn

Maximal input voltage: lOOOVdc or 750Vac valid value

Frequency response: 40Hz-lkHz True RMS

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Measuring range Resolution Accuracy

9.999Hz 0.001Hz

99.99Hz

999.9Hz

9.999KHz

99.99KHz

O.OlHz

O.lHz

0.001 KHz ± (1 % Reading + 3 digits)

0.01 KHz

999.9KHz

9.999MHz

0.1 KHz

0.001MHz

Input voltage range: 200mV-10V ac valid value

Overload protection: 600V DC/ AC

4.2.4 Electric resistance

Measuring range Resolution

60on

6kn

O.ln

1n

60kn 10n

600kn lOOn

6Mn

60Mn lkn lOkn

Overload protection: 600V D�/ AC

Open-circuit voltage: 1 V

Accuracy

+(0.8% Reading + 3 digits)

±(1.2% Reading + 30 digits)

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4.2.5 Diode

Functions

. range

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Testing conditions

Diode test

0-3V 0.001V

Forward DC current: approximately

Open-circuit approximately 3.2V.

voltage:

The display unit shows the approximate value of the diode's voltage drop. forward

Overload protection: 600V DC/ AC

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eeper continuity

Functi ans

Measur

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Resolution

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Description

When the built-in beeper sounds and the accompanying red indicator

IS on, the measured resistance shall not be over 30.n The red indicator will be on when the resistance is

400-600.

Testing conditions

Open-circuit voltage: approximat ely lV

Overload protection: 600V DC/ AC

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Measurinq ranqe

6nF

60nF

600nF

6µF

60µF

600µF

6mF lOOmF

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Resolution

O.OOlnF

O.OlnF

O.lnF

lnF lOnF lOOnF luF

O.OlmF

Overload protection: 600V DC/AC

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Accuracy

+ (4.0% Readinq + 30 diqits)

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+ (4.0% Reading + 3 digits)

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± (5.0% Readinq + 3 diaits)

4.2.8 DC current

Measuring range Resolution

60µA

600µA

6mA

60mA

600mA

O.OlµA

O.lµA

Accuracy

O.OOlmA

O.OlmA

O.lmA

lOmA

±(0.8% Reading + 3 digits)

10 .

00A ±(1.2% Readinq + 3 diqits)

Overload protection: protective tube for mA measuring range

(FF600mA/ 2 SOV) ; protective tube for lOA measuring range (FFlOA/ 250V).

Maximal input current: mA position: 600mA DC/AC (valid value); lOA position: lOA DC/ AC (valid value)

When the measured current is over SA, the duration of continuous measurement shall not be over 10 seconds. The current measurement shall be carried out 1 minute after the completion of previous measurement.

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Measuring range Resolution

60µA

600µA

6 mA

60mA

600mA

O.OlµA

O.lµA

Accuracy

O.OOlmA

O.OlmA

O.lmA

lOmA

+(1% Reading + 3 digits) lOA ± (1.5% Readinq + 3 digits)

Overload protection: protective tube for mA measuring range

(FF600mA/ 250V) ; protective tube for lOA measuring range (FFlOA/ 250V).

Maximal input voltage: mA position: 600mA DC/AC (valid value); lOA position: lOA DC/ AC (valid value)

When the measured current is over SA, the duration of continuous measurement shall not be over 10 seconds. The current measurement shall be carried out 1 minute after the completion of previous measurement.

Frequency response: 40Hz-lkHz True RMS

4 2 10 Ti

Measuring range t

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1000

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Overload protection: 600V DC/ AC

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Accuracy

+ {1.0%+ 3) reading

+ (1.0%+3) reading

5. Meter maintenance

This section provides the basic information on maintenance, including the descriptions about replacement of protective tubes and batteries.

Do not attempt the meter maintenance unless you are experienced in maintenance and have read the information on calibration, performance test and maintenance ..

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5.1 General maintenance

_A To avoid any electric shock or damage to the meter, do not attempt to clean the inside of the meter. You must remove the line connecting a test lead to input signals, before a enin the case or batte cover.

You must regularly use damp cloth and a small quantity of detergent to clean the meter's shell. Don't attempt the use of any abradant or chemical solvent.

The dirty or damp input socket may affect reading.

Steps for cleaning input sockets:

• Disenable the meter and pull all test leads out of the input socket.

• Clean up all dirty substances on sockets.

• Use a new cotton ball with a detergent or lubricant to clean each socket, because lubricant can prevent the socket vulnerable to dampness from pollution.

5.2 Battery & fuse replacement

To avoid any electric shock or personal injury as a result of incorrect reading, replace batteries once the symbol

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appear on the display unit.

Only the designated fuse (600mA/ 250V,10A/ 250V quick-acting fuse) can be used.

To avoid any electric shock or personal injury, don't attempt to open the battery cover to replace batteries, unless you have already powered off the device and carried out an examination to ensure that the test lead has been disconnected from the circuit to be measured

Batteries must be replaced by the following steps:

1. Cut off the power to the meter.

2. Pull all test leads out of the input socket.

3. Use a screw driver to unscrew the bolts that are used to fix battery cover.

4. Take off the battery cover.

5. Remove the old batteries or the damaged protective tubes.

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6. Make replacements with new 4x 1.5 V AA batteries or new protective tu bes.

7. Remount the battery cover and fix a bolt.

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