Mastech MS8238A Manual de usuario

MS8238A

User's Manual

Digital Multimeter

600V

CAT II

MS8238A

250

CONTENTS

2.Safety Information..................................1

2.1 Safety Standards................................1

1.Overview .................................................1

2.2 Precautions......................................2

Warning

1.Overview

To avoid electrical shock or personal injury,

please read all safety information, warnings and

precautions before using the meter.

The MS8238A is a small, safe and reliable 3 1/2 digit

handheld multimeter. This meter can measure AC/DC

voltage, AC/DC current, resistance, diode, continuity,

battery test and non-contact voltage tests. This tool is

ideal for professionals and hobbyists alike.

2. Safety Information

2.1 Safety Standards

The MS8238A meets the safety standards UL61010-1,

CSA C22.2 No.61010-1, CAT II 600V and a pollution

degree 2.

• The protection provided by the meter can only be

ensured if all safety procedures are strictly followed.

• The safety symbols on the meter are to advise of

potential dangerous situations.Caution is required

when measuring close to the mete’s safety limits.

• Never exceed the protection limit values indicated in

the specifications for each range of measurement.

2.3 Electrical Symbols ..............................3

3.Description and Usage ...........................4

3.1 Front Panel.......................................4

3.2 Display ...........................................5

3.3 Using the Meter..................................6

4.Specifications ......................................10

4.1 General Specifications........................10

4.2 Technical Specifications ......................11

5.Maintenance.........................................14

5.1 General Maintenance .........................14

5.2 Replacing the Battery and Fuses.............15

5.3 Replacing the Probe ...........................15

WARNING

The special attention should be paid when using the meter

because the improper usage may cause electric shock and

damage the meter .The safety measures in common safety

regulations and operating instruction should be complied with

when using. In order to make fully use of its functions and

ensure safe operations please comply with the usage in this

section carefully. If the equipment is used in a manner not

specified by the manufacturer, the protection provided by the

equipment may be impaired.

6. Accessories.....................................................15

2.2 Precautions

• To avoid electrical shock or personal injury, observe

and follow all safety precautions

• Check the meter for damage before use. Do not use if

any damage is observed.

• Check the test leads for cracks or exposed wires before

using the meter. Replace if necessary.

• Ensure the meter works properly by testing a known

voltage source first.If not working properly, the

protective equipment may be damaged; have the meter

serviced before using.

• Never measure voltages that may exceed the protection

limit indicated on the meter.

• Always be careful when working with voltages above

60V dc or 30V ac rms. Keep fingers behind the probe

barriers when making voltage measurements.

• Make sure the test leads are in the correct input jacks

before measurement.

• Do not expose the meter to explosive gas, dust or vapor.

• When connecting the test leads to a measurement

circuit, connect the common lead first, then the live lead.

Reverse when disconnecting.

• Turn off power to circuit and discharge all capacitors

before making resistance, continuity or diode

measurements.

• In order to avoid incorrect DC voltage readings, check

the circuit for AC voltage first, then put the meter in the

appropriate DC voltage range.

• Turn off circuit power and check fused before connect

the leads when measuring current.Turn circuit power

on after making connection.

• Never use the meter unless the back cover is in place

and fastened securely.

• When the low battery indicator“ ”is displayed, replace

the battery.The accuracy of the meter cannot be

guaranteed while the low battery indicator is on.

• Before opening the case, always disconnect test leads

from all energized circuits.

• For continued protection against fire, replace fuse only

with the specified voltage and current ratings listed in

the manual.

2.3 Electrical Symbols

Important safety information. Read the manual.

High voltage with danger.

Ground.

Double Insulation (Class II safety equipment).

Fuse must be replaced as per the specification herein.

Accord with the related EU laws and regulations

AC (Alternating Current)

DC (Direct Current)

Conforms to UL STD 61010-1;

Certified to CSA STD C22.2 NO.61010-1

This product has been tested to the requirements

of CAN/CSA C22.2 NO.61010-1,second edition,

including Amendment 1.

CAT II (Measurement category ll): it is for measurements

performed on circuits directly connected to the low voltage

installation.

3 Description and Usage

3.1 Front Panel

1.LCD display

2.Data hold button

3.Rotary switch

4.10A input jack

5.Common jack

6.Input jack (all functions except current greater than

200mA)

7.Non-contact voltage (NCV) button

8.Non-contact voltage (NCV) indicator

3.2 Display

1.Low battery indicator

2.Data hold

3.Measurement display

4.Polarity indicator

5.Diode cycle

MS8238A

250

3.3 Using the Meter

3.3.1 Data Hold

The data hold function will hold the current reading on

the display.

• Press the “HOLD” button to hold the current reading.

“H” symbol will appear on the display.

• Press the “HOLD” button to release the hold.

Hold the “NCV” button down in any mode and the meter

will activate the non-contact voltage detection.

• Hold the meter up to a voltage source and the buzzer

will sound and the NCV indicator will light up if voltage

is detected.

• Release the “NCV” button to stop NCV detection.

3.3.2 Non-Contact Voltage Detection (NCV)

3.3.3 AC/DC voltage measurement

• Set the rotary switch to the appropriate AC or DC

voltage range.

• Connect the red test lead to the input jack and the black

lead to the COM jack.

• Connect the leads to the circuit under test and read the

measurement on the display. Observe polarity for DC

measurements. If “OL” is display, it means the

measurement has exceeded the current range. Move

the rotary switch to a higher range.

Warning

Do not measure voltages higher than 600V DC

or AC rms to perevent damage to the meter or

personal injury.

3.3.4 AC/DC current measurement

• Turn off power to the circuit. Allow all capacitors to

discharge.

• Set the rotary switch to the appropriate AC or DC

current range.

• Depending on the current to be measured, connect the

red test lead to either the input or 10A jack and the black

lead to the COM jack.

• Break the circuit and connect the leads in series with the

circuit (black lead on the lower voltage side).

• Turn circuit power on and read the measurement on the

display. If “OL” is display, it means the measurement

has exceeded the current range.Move the rotary switch

to a higher range.

Warning

Never measure open-circuit voltages exceeding

250V between the input terminals and ground to

prevent injury or damage to the meter.

NOTE

Check fuses before making current measurements,

Make sure to use correct input jacks to prevent

damage to the meter.

4. Specifications

4.1 General Specifications

When battery voltage drops below

normal operating voltage,“ ”is

shown on the display

Polarity Indication Display automatically displays “-“

Power Source 1x 9V battery (NEDA 1604, 6F22 or 006P)

Function Range

Safety Rating CAT II 600V; pollution degree: 2

Operating Altitude ≤2000m

Operating Temperature/

Humidity 0~40°C, <80% RH

Storage Temperature/

Humidity -10~60°C, <70% RH, remove battery

Max. Input between

terminals and earth

ground

600V DC or AC rms

Fuse Protection 10A ranges: F1:F10A H 250V

mA range: F2:F250mA H 250V

Sample Rate Approx. 3 times/sec.

Display 3 ½ digit LCD display

Overload Indication Display shows “OL”

Low Battery Indication

4.2 Technical Specifications

Accuracy: ±(% of reading + digits) at 18°C~28°C with a

relative humidity of <80%; guaranteed for a period of one year.

4.2.3 Resistance

Resolution Accuracy

200Ω

2kΩ

0.1kΩ

0.001kΩ

0.1Ω

0.01kΩ

0.001MΩ

20kΩ

200kΩ

2MΩ

Measuring range

±(0.8% of reading +4 digits)

Overload protection: 250V DC or AC (RMS)

Resolution Accuracy

200V

600V 1V

0.1V

4.2.2 AC Voltage

Max. input voltage: 600V DC or AC rms.

Frequency Response: 40~400Hz, sine wave rms

(avg. response)

Measuring range

±(1.0% of reading +5 digits)

4.2.1 DC Voltage

Max. input voltage: 600V DC or AC rms.

Resolution Accuracy

200mV

0.1V

0.001V

0.1mV

0.01V

20V

200V

600V ±(0.8% of reading +5 digits)

Measuring range

±(0.5% of reading +2 digits)

3.3.5 Resistance measurement

• Turn off power to the circuit. Allow all capacitors to

discharge.

• Set the rotary switch to the appropriate resistance range.

• Connect the red test lead to the input jack and the black

lead to the COM jack.

• Connect the leads to the circuit under test and read the

measurement on the display.

Tips for measuring resistance:

• In-circuit resistance is usually different from a resistors

rating due to the fact that the meter’s test current flows

in parallel with the circuit.

• For increased accuracy when measuring low

resistances, short the test leads, record the value

displayed, then connect the leads to the circuit and

subtract the shorted value from the circuit measurement.

• When the leads are disconnected from the circuit under

test, “OL” will be displayed on the screen.

Warning

To prevent injury or damage to the meter,turn

off power to circuit and discharge all capacitiors

fully before making resistance measurements.

3.3.6 Continuity measurement

• Turn off power to the circuit. Allow all capacitors to

discharge.

• Set the rotary switch to the continuity position.

• Connect the red test lead to the input jack and the black

lead to the COM jack.

• Connect the leads to the circuit under test.If the

measured resistance is less than 50Ω, the buzzer

will sound.

Warning

To prevent injury or damage to the meter,turn

off power to circuit and discharge all capacitiors

fully before making resistance measurements.

3.3.7 Diode test

Turn off power to the circuit. Allow all capacitors to

discharge.

• Set the rotary switch to the diode position.

• Connect the red test lead to the input jack and the black

lead to the COM jack.

• Connect the red test lead to the anode (+) and the black

lead to the cathode (-) of the diode and read the

measurement on the display.The meter will display “OL”

if the connection is reversed.

Warning

To prevent injury or damage to the meter,turn

off power to circuit and discharge all capacitiors

fully before making resistance measurements.

3.3.8 Battery test

• Set the rotary switch to the appropriate battery test range.

• Connect the red test lead to the input jack and the black

lead to the COM jack.

• Connect the red test lead to the positive (+) end and the

black lead to the negative (-) end of the battery and read

the measurement on the display.

Warning

To prevent injury or damage to the meter,do not

connent the meter to a battery with a voltage rating

exceeding 60V AC or 30V DC

4.2.6 DC Current

Resolution Accuracy

200mA 0.1mA

10mA10A

Measuring range

±(0.8% of reading +3 digits)

±(2.5% of reading +3digits)

If measured resistance

is less than 50Ω,

buzzer will sound

4.2.5 Continuity

Function Description

Description

Open circuit

voltage: 2.9V

Overload protection: 250V DC or AC (RMS)

Forward DC current:1mA

Reverse DC voltage: 2.9V

Display shows forward

voltage drop

4.2.4 Diode Test

Function DescriptionResolution

0.001V

Diode Test

Overload protection: 250V DC or AC (RMS)

4.2.7 AC Current

Resolution Accuracy

200mA 0.1mA

10mA10A

Measuring range

±(1.0% of reading +3 digits)

±(2.5% of reading +3digits)

Overload protection: mA jack: F250mA H 250V fuse

10A jack: F10A H 250V fuse

Max input current: mA jack: 200mA AC rms

10A jack: 10A AC rms

When measuring current exceeding 2A, do not measure

for longer than 2 minutes continuously.Wait 10 minutes

to continue measurement.

4.2.8 Battery Test

Resolution Accuracy

12V 0.01V

0.01V

Position

±(0.8% of reading +7 digits)

±(0.8% of reading +7digits)

1.5V 0.001V ±(3.0% of reading +5digits)

Overload protection: F250mA H 250V fuse

4.2.9 NCV Test

• Hold down the NCV button and move the NCV sensor

at the top of the unit next to the object being tested.

• When voltage is detected (>110V AC rms) the buzzer

will sound and the NCV indicator will flash.

Overload protection: mA jack: F250mA H250V fuse

10A jack: F10A H 250V fuse

Max input current: mA jack: 200mA DC

10A jack: 10A DC

When measuring current exceeding 2A, do not measure

for longer than 2 minutes continuously.Wait 10 minutes

to continue measurement.

5. Maintenance

5.1 General Maintenance

This section provides basic information on maintaining

the meter, such as replacing fuses and the battery. Only

experienced and authorized personnel should make

repairs to the meter.

Warning

To avoid injury or damage to the meter,do not allow

moisture inside the case and remove test leads

before opening battery cover.

• Use a damp cloth to regularly clean the outside of the

meter. Do not use abrasives or chemical solvents.Dirty

or damp input jack can adversely affect readings.

• To clean input jacks, follow the following steps:

1. Turn off the instrument and remove the test leads.

2. Clear any dirt or other particles on the input jacks.

3. Use a cotton ball/swab with a lubricant (i.e. WD-40) to

clean off the contacts of the input jacks.

4. Use a separate cotton ball/swab for each jack to

prevent cross-contamination.

5.2 Replacing the Battery and Fuses

5.3 Replacing the Probe

Note:

• Even if the indicator doesn’t go off, voltage may still

exist.Do not use NCV detection as the sole

determination of a lack of voltage present in a

conductor.Detection could be impaired by socket

design, insulation, etc.

• When measuring voltage through input jacks, NCV

indicator may light up due to induced voltage.

• External environmental interference could cause false

NCV indications.

1. Under normal conditions, it is unnecessary to replace the fuse.

Don't replace it until the probes are unplugged and the power is

shut down. Take out the two screws of the rear cover to remove

the housing.

2. The specification of the fuse is:

F1 F 10A H 250V, F2 F 250mA H 250V

The replacement should be of the same specification.

3. The battery for this multimeter is 9V NEDA 1604 or 6F22.

The replacement should be of the same specification.

4. Don't put the instrument into use until the rear cover is screwed

after replacing battery or fuse.

To avoid electric shock, make sure the probes are disconnected

from the measured circuit before removing the rear cover.

Make sure the rear cover is tightly screwed before using the

instrument.

Warning

If insulation on probe is damaged, replace it.

Use meet EN 61010-031 standard, rated CAT II 600V, 10A or better probe.

WARNING

6. Accessories

•

Test Leads 1set

Package 1pcs

9V Battery 1pcs

User's Manual 1pcs

R-00-05-1048

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