Mastech MS8265 Instrucciones de montaje

MS8265

DIGITAL MULTIMETER

OPERATOR'S

INSTRUCTION MANUAL

MS8265

ON/OFF

HOLD LIGHT

10A

COM

FUSED,10A MAX

RESETTABLE

750V

1000V

MAX

600V CAT III

1000V CAT II

hFE

200m

200m 2m

10 hFE

200m

200

1000

750

200

200M

200K

20K

200

200μ

20μ

2μ

200n

20n

20M

KHz

1. GENERAL INSTRUCTIONS.......................1

1.1 Precaution safety measures......................1

1.1.1 Preliminary......................................1

1.1.2 During use........................................2

1.1.3 Symbols...........................................4

1.1.4 Instructions......................................5

1.2 Protection mechanisms............................6

2. DESCRIPTION...........................................6

2.1 Instrument Familiarization.........................6

2.2 LCD Display..............................................7

2.3 Keypad.....................................................8

2.4 Terminals..................................................9

2.5 Accessories..............................................9

3. FUNCTION DESCRIPTION......................10

3.1 General Functions..................................10

3.1.1Misconnection Alarm........................10

3.1.2 ..........11

3.1.3 Battery saver........

3.2 Measurement Functions

DATA HOLD mode................

..........................11

....................11

3.2.5 Capacitance measurement

3.2.6 Transistor measurement...

3.2.7 Frequency measurement...............17

3.2.8 Current measurement........

4. TECHNICAL SPECIFICATIONS

4.1 General specifications

4.2 Measurement specifications

4.2.1 DC Voltage

4.2.2 AC Voltage

4.2.3 Frequency......................................21

4.2.4 Resistance

4.2.5 Diode Test...........

4.2.6 Continuity Check

4.2.7 Transistor

4.2.8 Capacitance

4.2.9 DC current

4.2.10 AC current..

5. MAINTENANCE

5.1 General Maintenance

5.2 Battery Replacement

............16

.............17

............18

..............19

............................19

...................20

....................................20

....................................21

..........................22

...........................22

........................................22

...................................22

.....................................23

..................................23

.....................................24

............................24

..............................25

3.2.1 AC and DC

Voltage measurement................11

CONTENTS CONTENTS

3.2.2 Resistance measurement...............12

3.2.3 Diode Test......................................14

3.2.4 Continuity Check............................15

01 02

1. General Instructions

This instrument complies with IEC 1010-1 (61010

-1@IEC: 2001), CAT. II 1000V and CAT. III 600V

over voltage standards. See Specifications.

To get the best service from this instrument, read

carefully this user's manual and respect the

detailed safety precautions.

International symbols used on the Meter and in this

manual are explained in chapter 1.1.3

1.1 Precautions Safety Measures

Measurement category III is for measurements

performed in the building installation.

NOTE: Examples are measurements on distribution

boards, circuit-breakers, wiring, including cables,

bus-bars, junction boxes, switches, socket-outlets

in the fixed installation, and equipment for industrial

use and some other equipment, for example,

stationary motors with permanent connection to the

fixed installation.

Measurement category II is for measurements

performed on circuits directly connected to the low

voltage installation.

NOTE: Examples are measurements on household

appliances, portable tools and similar equipment.

Measurement category I is for measurements

performed on circuits not directly connected to MAINS.

NOTE: Examples are measurements on circuits not

derived from MAINS, and specially protected (internal)

MAINS derived circuits. In the latter case, transient

stresses are variable; for that reason, requires that the

transient withstand capability of the equipment is made

known to the user.

1.1.1 Preliminary

*When using this Multimeter, the user must observe all

normal safety rules concerning:

– protection against the dangers of electric current.

– protection of the Multimeter against misuse.

* For your own safety, only use the test probes supplied

with the instrument. Before use, check that they are

in good condition.

*If the meter is used near noise generating equipment,

be aware that display may become unstable or indicate

large errors.

*Do not use the meter or test leads if they look damaged.

*Use the meter only as specified in this manual;

otherwise, the protection provided by the meter may

be impaired.

*Use extreme caution when working around bare

conductors or bus bars.

*Do not operate the meter around explosive gas, vapor,

or dust.

*Verify a Meter's operation by measuring a known

voltage. Do not use the Meter if it operates abnormally.

Protection may be impaired. When in doubt, have the

Meter serviced.

*Uses the proper terminals, function, and range for

your measurements.

*When the range of the value to be measured is

unknown, check that the range initially set on the

multimeter is the highest possible or, wherever

possible, choose the autoranging mode.

1.1.2 During use

03 04

*To avoid damages to the instrument, do not exceed

the maximum limits of the input values shown in the

technical specification tables.

When the multimeter is linked to measurement circuits,

do not touch unused terminals.

Caution when working with voltages above 60Vdc or

30Vac rms. Such voltages pose a shock hazard.

When using the probes, keep your fingers behind the

finger guards.

When making connections, connect the common test

lead before connecting the live test lead; when

disconnecting, disconnect the live test lead before

disconnecting the common test lead.

Before changing functions, disconnect the test leads

from the circuit under test.

For all dc functions, to avoid the risk of shock due to

possible improper reading, verify the presence of any

AC Voltages by first using the ac function. Then select

a DC Voltage range equal to or greater than the ac range.

Disconnect circuits power and discharge all

high-voltage capacitors before testing resistance,

continuity, diodes, or capacitance.

Never perform resistance or continuity measurements

on live circuits.

Before measuring current, check the meter's fuse

and turn off power to the circuit before connecting the

meter to the circuit.

In TV repair work, or when carrying out measurements

on power switching circuits, remember that high

amplitude voltage pulses at the test points can damage

the multimeter. Use of a TV filter will attenuate any

such pulses.

*Use the 9V NEDA battery, properly installed in the

Meter's battery case, to power the Meter.

*Replace the battery as soon as the battery indicator

( ) appears. With a low battery, the Meter might

produce false readings that can lead to electric shock

and personal injury.

*Do not measure voltages above 600V in Category III,

or 1000V in Category II installations.

*Do not operate the Meter with the case

(or part of the case) removed.

Symbols used in this manual and on the instrument:

1.1.3 Symbols:

Caution: refer to the instruction manual.

Incorrect use may result in damage to the

device or its components.

AC (Alternating Current)

DC (Direct Current)

Earth ground

Double insulated

Fuse

Conforms to European Union directives

DC (Direct Current) or AC (Alternating Current)

05 06

* Any adjustment, maintenance or repair work carried

out on the meter while it is live should be carried out

only by appropriately qualified personnel, after

having taken into account the instructions in this

present manual.

* A "qualified person" is someone who is familiar with

the installation, construction and operation of the

equipment and the hazards involved. He is trained

and authorized to energize and de-energize circuits

and equipment in accordance with established

practices.

* When the instrument is opened up, remember that

some internal capacitors can retain a dangerous

potential even after the instrument is switched off.

*If any faults or abnormalities are observed, take the

instrument out of service and ensure that it cannot

be used until it has been checked out.

*If the meter is not going to be used for a long time,

take out the battery and do not store the meter in

high temperature or high humidity environment.

* Fused by the resettable fuse (F400mA/250V) during

capacitance, temperature, mA and hFE

measurements.

A PTC resistor protects against permanent over

voltages of up to 250V during resistance, Frequency,

continuity and diode test measurements.

1.2 Protection mechanisms

2. Description

2.1 Instrument Familiarization

1. LCD display 2. Keypad

3. Rotary switch 4. Terminals

* Remove test leads from the Meter before opening

the Meter case or battery cover.

* When servicing the Meter, use only specified

replacement parts.

* Before opening up the instrument, always disconnect

from all sources of electric current and make sure

you are not charged with static electricity, which may

destroy internal components.

1.1.4 Instructions

MS8265

ON/OFF

HOLD LIGHT

10A

COM

FUSED,10A MAX

RESETTABLE

750V

1000V

MAX

600V CAT III

1000V CAT II

hFE

200m

200m 2m

10 hFE

200m

200

1000

750

200

200M

200K

20K

200

200μ

20μ

2μ

200n

20n

20M

KHz

07 08

See Table 1 indicated for information about the LCD

display.

2.2 LCD Display

Figure 1.Display

Table 1. Display Symbols

Meaning

Symbol

The battery is low.

Warning: To avoid false readings, which

could lead to possible electric shock or

personal injury, replace the battery as soon

as the battery indicator appears.

Indicates negative readings.

The Meter is in the Diode Test mode

Table 1. Display Symbols (continued)

The Meter is in the Continuity Check mode

The Meter is in the Data Hold mode

mV:

Volts. The unit of voltage.

Millivolt. 1x10 or 0.001 volts.

-3

mA:

μA:

Amperes (amps). The unit of current.

Milliamp. 1x10 or 0.001 amperes.

Microamp. 1x10 or 0.000001 amperes

-3

-6

k :

M :

Ω:

Ohm. The unit of resistance.

Kilohm. 1x10 or 1000 ohms.

Megohm. 1x10 or 1,000,000 ohms.

n :

µF

Farad. The unit of capacitance.

Microfarad.1x10 or 0.000001 farads.

Nanofarad. 1x10 or 0.000000001 farads

-6

-9

See Table 2 indicated for information about the keypad

operations.

2.3 Keypad

Table 2. Keypad

Function

Key

Any switch position

Operation performed

turn the meter on or off

Press HOLD to enter and

exit the Data Hold mode.

Any switch position

V, mV

A, mA,

µA

Ω, ΚΩ,

ΜΩ

µF, nF

HOLD

ON/OFF

Any switch position

Press LIGHT to turn the

backlight on. After about

5 seconds, the backlight

is auto-off.

LIGHT

The Meter is in the Transistor Test mode

hFE

kHz kHz: Kilohertz. 1x10³ or 1000 hertz.

09 10

See Table 4 indicated for information about the terminals.

2.4 Terminals

Table 4. Terminals

Description

Terminal

Return terminal for all measurements.

(Receiving the black test lead or the “com”

plug of the special multi-function socket)

Input for voltage, resistance, frequency,

diode and continuity measurements.

(Receiving the red test lead)

Input for capacitance, Temperature, hFE

and 0.001mA to 200mA current

measurements. (Receiving the red test

lead or the “+” plug of the special

multi-function socket)

Input for 10A current measurements.

(Receiving the red test lead)

Delivered with the multimeter:

2.5 Accessories

One piece

• User's manual

One piece

• Test leads

• Special Multi-function socket

3. Function Description

3.1 General Functions

3.1.1 Misconnection Alarm

The input jacks of the meter are equipped with sound

and light alarms against misconnection of test leads.

COM

VΩHz

°C mA

hFE

10A

1. At V Ω、Hz ranges:

1) The red lights at the “V” and “COM” jacks will be

off after the test leads are plugged in.

2) The buzzer will sound upon misconnection of the

test leads in the “mA” or “10A” jacks to warn the

user. At the same time, the lights at the “V” and

“COM” jacks will flash to remind the user to plug

in the test leads there.

2. At mA, hFE, ranges:

The red lights at the “mA” and “COM” jacks will

be off after the test leads are plugged in.

The buzzer will sound upon misconnection of

the test leads in the “V” or “10A” jacks to warn the

user. At the same time, the red lights at the “mA”

and “COM” jacks will flash to remind the user to

plug in the test leads there.

3. At 10A range:

1) The red lights at the “10A” and “COM” jacks will be

off after the test leads are plugged in.

2) The buzzer will sound upon misconnection of the

test leads in the “V” or “mA” jacks to warn the user.

At the same time, the lights at the “10A” and

“COM” jacks will

、、、

11 12

3.2 Measurement Functions

3.2.1 AC and DC Voltage measurement

To avoid electrical shock and/or damage to the

instrument, do not attempt to take any voltage

measurement that might exceeds 1000Vdc or

750Vac rms.

To avoid electrical shock and/or damage to the

instrument, do not apply more than 1000Vdc or

750Vac rms between the common terminal and

the earth ground.

Voltage is the difference in electrical potential between

two points. The polarity of ac (alternating current)

voltage varies over time; the polarity of dc (direct

current) voltage is constant.

The Meter's DC voltage ranges are 200.00mV, 2.0000V,

20.000V, 200.00V and 1000.0V；AC voltage ranges

are 2.0000V, 20.000V, 200.00V and 750.0V.

To measure ac or dc voltage:

1. Set rotary switch to the proper range.

2. Connect the black and red test leads to the COM

and V terminals respectively.

3. Connect the test leads to the circuit being measured

4. Read the displayed value. The polarity of red test

lead connection will be indicated when making a

DCV measurement.

Note:

Unstable display may occur especially at DC200mV

and AC2V ranges, even though you do not put test

leads into input terminals, in this case, if an erroneous

reading is suspected, short the V terminal and the

COM terminal, and make sure the zero display.

3.2.2 Resistance measurement

To avoid electrical shock and/or damage to the

instrument, disconnect circuit power and

discharge all high-voltage capacitors before

measuring resistance.

3.1.2 DATA HOLD mode

Data Hold mode makes the meter stop updating the

display. Data Hold function can be cancelled by

changing the measurement mode, or push HOLD

key again.

To enter and exit the Data Hold mode:

1. Press HOLD key. Fixes the display on the current

value, is displayed.

2. A second short press returns the meter to normal

mode.

3.1.3 Battery Saver

Turn on the meter. And then The Meter will be turned

off automatic after approx. 30 minutes.

13 14

3.2.3 Diode Test

To avoid electrical shock and/or damage to the

instrument, disconnect circuit power and

discharge all high-voltage capacitors before

testing diodes.

Use the diode test to check diodes, and other

semi- conductor devices. The diode test sends a

current through the semiconductor junction, and then

measures the voltage drop across the junction; a

good silicon junction drops between 0.5V and 0.8V.

To test a diode out of a circuit:

1. Set the rotary switch to range.

2. Connect the black and red test leads to the COM

and terminals respectively.

3. For forward-bias readings on any semiconductor

component, place the red test lead on the

component's anode and place the black test lead

on the component's cathode.

4. The meter will show the approx. forward voltage of

the diode. If the test lead connection is reversed,

only figure "1" displayed.

In a circuit, a good diode should still produce a forward

bias reading of 0.5V to 0.8V; however, the reverse-bias

reading can vary depending on the resistance of other

pathways between the probe tips.

Resistance is an opposition to current flow.

The unit of resistance is the ohm ( ).

The Meter's resistance ranges are 200.00Ω,

2.0000kΩ, 20.000kΩ, 200.00kΩ, 2.0000MΩ,

20.000MΩ and 200.00MΩ.

To measure resistance:

1. Set the rotary switch to proper range.

2. Connect the black and red test leads to the COM

and terminals respectively.

3. Connect the test leads to the circuit being

measured and read the displayed value.

Ω

Some tips for measuring resistance:

• The measured value of a resistor in a circuit is often

different from the resistor's rated value. This is

because the Meter's test current flows through all

possible paths between the probe tips.

• In order to ensure the best accuracy in measurement

of low resistance, short the test leads before

measurement and memory the test probe resistance

in mind. This necessary to subtract for the resistance

of the test leads.

The resistance function can produce enough voltage

to forward-bias silicon diode or transistor junctions,

causing them to conduct. To avoid this, do not use the

2M range for in-circuit resistance measurements.

•

• On 20MΩ and 200MΩ ranges, the meter may take

a few seconds to stabilize reading. This is normal

for high resistance measuring.

• When the input is not connected, i.e. at open circuit,

the figure "1" will be displayed for the over range

condition.

3.2.5 Capacitance measurement

To avoid electrical shock and/or damage to the

instrument, disconnect circuit power and discharge

all high-voltage capacitors before measuring

capacitance. Use the dc voltage function to confirm

that the capacitor is discharged.

15 16

Capacitance is the ability of a component to store an

electrical charge.

The unit of capacitance is the farad (F). Most capacitors

are in the nanofarad to microfarad range.

The Meter's capacitance ranges are 20.000nF, 200.00nF,

2.0000F, 20.000F, and 200.00F.

To measure capacitance:

1. Set the rotary switch to proper range.

2. Connect the black and red test leads to the COM

and terminals respectively(or you can measure the

capacitance by using the special Multi-Function

Socket).

3. Connect the test leads to the capacitor being

measured and read the displayed value.

Some tips for measuring capacitance:

• The meter may take a few seconds to stabilize

reading. This is normal for high capacitance

measuring.

• To improve the accuracy of measurements less

than 20nF, subtract the residual capacitance of

the Meter and leads.

3.2.4 Continuity Check

To avoid electrical shock and/or damage to the

instrument, disconnect circuit power and

discharge all high-voltage capacitors before

testing for Continuity.

Continuity is a complete path for current flow.

The beeper sounds if a circuit is complete. These

brief contacts cause the Meter to emit a short beep.

To test for continuity:

1. Set the rotary switch to range.

2. Press the yellow key twice to activate Continuity

Check.

3. Connect the black and red test leads to the COM

and terminals respectively.

4. Connect the test leads to the resistance in the

circuit being measured.

5. When the test lead to the circuit is below approx.

50Ω, a continuous beeping will indicate it.

Note:

Continuity test is available to check open/short of the

circuit.

Ω

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