Pro's Kit MT-2208 Manuel utilisateur

MT-2208

Protective Multifunction Analog Multimeter

User’s Manual

1st Edition,2023

INTRODUCTION

This Multi-meter is an accurate, safe handheld meter that comes with mirrored

Aluminum dial, robust protective holster alongside, built-in stand and hook-up

design. MT-2028 is powered by batteries, offers accurate, reliable measurement of

DC/AC Voltage, DC Current, Resistance and Diode, LED, Transistor, Decibels,

infrared signal detection, Continuity test and Capacitance with very high sensitivity

quality movement.

This meter is designed with double-sided glass-epoxy PCB, full overload &

misused protection via two Fuses, voltage Suppressor & Diodes, and smart

protection on Ω testing via the extra Resettable Fuse & Varistor. Ideal for indoor

use in laboratory, school, workshop, and home applications.

SPECIFICATION

Safety Category: IEC61010-1, CAT II 1000V CAT III 500V and Pollution Degree 2.

Common Environment: 23C5C, less than 75% RH.

Operating temperature: 0C to 40C, 32 F to 104 F

Storage temperature: -10 C to 50C, 14 F to 122F

Operating Humidity Scope: Less than 90% RH.

Storage Humidity Scope: less than 80% RH.

Dimensione: 179(L) x 118(W) x 50(H) mm

Weight: 500g approx. (not including test leads and batteries)

Accessories: One pair of test leads;

Spare Fuse: F0.5A 250V;F10A 250V, Φ5x20mm

Test

Functions

Range

Accuracy

Remarks

DC V

0-0.25-1-2.5-10-50-25

0-1000V(2500V)

3% FSD.

4% FSD for

1000V(2500V)

Input Impedance:

20KΩ/V, UP 50V 9KΩ/V;

Overload Protection:

0.25V/1V/2.5V/10V/50V

Range，250V Max.

250V/1000V Range,

1000V AC/DC Max.

2500V Range, 2500V

AC/DC Max.

AC V

0-10-50-250V-

1000V(2500V)

4% FSD.

5% FSD for

1000V(2500V)

Input Impedance: 9KΩ/V

Overload Protection:

10V/50VRange, 250V

Max. Band width: 40

~10K Hz

1000V Range ,1000V

AC/DC Max.

2500V Range ,2500V

AC/DC Max.

DC mA

0-50uA-0.5mA-5mA-5

0mA-500mA(10A)

3% FSD.

4% FSD for

10A

Drop Voltage: 250 mV

Overload protected by

Fuses 0.5A/250V & 10A

/ 250V at 10A range,

Max. test time 10sec. for

10A.

Ω

X 1: 0.2 ~ 2KΩ

Midscale at 20Ω

X 10: 2 ~ 20KΩ

Midscale at 200Ω

X 100: 20 ~ 200KΩ

Midscale at 2000Ω

X1K: 200~ 2MΩ

Midscale at 0KΩ

X10K: 2K ~20MΩ

Midscale at 200KΩ

X100K: 20K ~200MΩ

Midscale at 2MΩ

4% of ARC of

Scale Length

Overload protected by

the voltage Suppressor

& Fuse (3sec.)

Capacitance

(uF)

Cx1: 50uF

Cx10: 500uF

Cx100: 5000uF

Cx1K & Cx10K:

Approx. Value

Overload protected by

the voltage Suppressor

& Fuse (3sec.)

BATT

Check

0 -1.2V- 1.5V-

2.0V-3V-3.6V: BAD

(red)- ?

–GOOD(green)

5% of ARC of

Scale Length

Overload protected by

the voltage Suppressor

& Fuse (3sec.)

Transistor

Check

hFE: 0-1000 via

special hFE socket

Approx. Value

At Ω X 10 Range

LED, Diode

Check

via special hFE socket

Approx. Value

At Ω X 10 Range

Decibel

-22 dB ~ + 62 dB

(0dB=1mW at 600Ω)

Approx. Value

At ACV ranges

Via Test Leads

Continuity

Check

Beeper sounding

under 50 Ohm

Overload protected by

the voltage Suppressor

& Fuse (3sec.)

Infrared

signal

detection

Vertical allow angle ±

15°

Distance：1-30cm

LED light(red) indicates

Power

Source

Internal Battery: AAA,

1.5V 2pcs

Name of part

1.Scale panel 2.Point zero adjust 3. hFE socket 4.Range switch

5.VΩmA input socket 6.COM input socket 7.10A input socket

8.2500V input socket 9.Resistance zero adjust 10. Infrared receiving

hole 11.LED indicator.

CALIBRATION

Ohms Zero Adjustor located at the right side of the panel. Adjust the meter pointer

to the Zero mark on the right side of Ohm scale of the meter dial when the test

leads are touched together.

Mechanical Adjustor Screw: located right side below the center of the meter dial to

set pointer to Zero mark at the left side of the scale.

(-) Jack: Plug-in connector at the lower left on the panel for black, negative test

lead.

(+) Jack: Plug-in connector at the lower right on the panel for Red, positive test

lead.

STAND & HOOK-UP

This meter can be used in any operating position. It has an oblique bracket and a

hook behind it. Users should choose according to their own needs. And it have

magnets on its back to absorb the suspension.

OPERATING INSTRUCTIONS

CAUTION!

When making voltage or current measurements, develop the habit of turning off

all power to the circuit under test. Connect the test leads at the desired points in

the circuit, and then turn on the power while taking readings. Turn off the power

before disconnecting the test leads from the circuit.

INTERNAL BATTERY CHECK

To check the battery condition, insert the black test lead into the (-) jack. Set the

range switch to the R X1 range position and short the ends of the two sides of

the test leads. If the pointer can not be brought to the zero mark, replace the

1.5V batteries. (See battery replacement.)

BEFORE OPERATING

1. Set the range switch to the proper position before making any measurement.

2. Never apply more voltage or current than the rated value in every position.

3. When the voltage or current to be measured it not known, always start with

the highest range.

4. If meter indication is in the lower half of the scale and falls within the range of

a lower scale, reset selector switch to the lower range for greatest accuracy.

5. If the meter won’t work at all, check the fuse located on the PCB. If it’s blown,

replace it. (See fuse replacement.)

6. Avoid placing the meter where extreme shock or continuous vibration is

encountered and do not store in excessively hot or damp places. Although

very rugged, the meter is a sensitive measuring device and should be

handled carefully & properly.

7. Do not check resistance, transistor, diode, LED, or capacitance when live

voltage or current input across the circuit.

8. When the meter is not in use, keep the selector switch to the “DC or AC

voltage” range position, this provides direct short across meter movement for

minimum needle bounce when transporting meter.

9. If you should accidentally apply excessive voltage or current on a certain

range, disconnect the leads from the circuit as quickly as possible, check

instrument operation on that range by applying peoper input. If the meter

does not operate properly, check fuse. If it is blown replace it. (See fuse

replacement.)

OPERATION PROCEDURES

DC Voltage Measurement

WARNING: USE EXTREME CARE WHEN MAKING

MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH

TERMINAL OR PROBE ENDS.

1. Set the selector switch to the appropriate DCV range to be used.

2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the

“+” jack.

3. If measuring a voltage above 1000V, insert the red test lead into the “2500v”

jack.

4. If you know the polarity of the circuit to be tested, connect the black probe to

the negative side.

5. If you don’t know the polarity, connect the probes to opposite sides of the circuit

and watch the pointer. If it goes to the left, reverse the probes. The RED probe

will be connected to the positive.

6. Check the needle position and the get the reading on V.A scale.

AC Voltage Measurement

WARNING: USE EXTREME CARE WHEN MAKING

MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH

TERMINAL OR PROBE ENDS!

1. Set the selector switch to the appropriate ACV range to be used and connect

the test leads across the circuit or load under measurement. (Polarity of the test

probes is unimportant on ACV test.)

2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the“+”

jack.

3. If measuring a voltage above 1000V, insert the red test lead into the “2500v”

jack.

4. Check the needle position and the get the reading on V.A scale.

Note: When measuring high pressure at 2500V, wear rubber insulated gloves

on both hands and be in a dry insulated environment.

DC Current Measurement

WARNING: DO NOT APPLY VOLTAGE TO MEASURING

TERMINAL WHILE RANGE SWITCH IS IN CURRENT POSITION. DO

NOT ATTEMPT TO MEASURE AC CURRENT.

1. Set the selector switch to the appropriate DC mA range to be used and connect

the test leads in series with the circuit or the load under measurement. If the

pointer deflects to the left, reverse the probes.

2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the

Red “+” jack for Current at/less than 0.5A. For large current max. 10A, move the

red test lead to the Red “10A” jack.

3. Check the needle position and the get the reading on V.A scale.

NOTE: Excessive current input across mA range will blow the fuse that must be

replaced by a same fuse rating 0.5A/250V or 10A/250V. The maximum testing

time once must be not more than 15sec. and pause 5min. for next time at big

current load.

The maximum terminal voltage drop is 250mV except for the 10A range.

NOTE: If connected incorrectly with the voltage at these ranges, quickly remove

the test leads from the circuit as to avoid damage to this tester.

(This tester can afford the voltage <250V DC/AC rms. for the period of 5 seconds

max.)

Resistance Measurement

WARNING: DO NOT APPLY VOLTAGE TO MEASURING

TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.

1. Set the selector switch to the appropriate Ω range to be used.

2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the

Red “+” jack.

3. Short the leads by touching the probes together. Pointer should read zero at the

right-hand end of the upper most scale, if it doesn’t, use the Ohm adjust knob

on the right hand of the panel to line up the pointer with zero. (If pointer can’t be

brought to zero, replace battery.)

4. Connect the test leads across the resistance to be measured.

5. Take reading on the top “Ω” scale and multiply it by the multiplication factor

indicated by the selector switch.

6. If there is little or no pointer movement from the left side of the scale, reset the

selector switch to higher range. The effective reading scope on an Ohm meter

scale is within the area of between 25 degree of Arc left side to the Midscale

and 25 degree right side to the Midscale.

NOTE: If connected incorrectly with the voltage, this tester can be automatically

restored to the normal working within 1 minute after taking off the test leads or the

voltage load from the tester without any damage. (This tester can afford the

voltage <250V DC/AC rms. for the period of 3 seconds max.)

Diode Measurement

1. Set the selector switch to the appropriate Ω range to be used.

NOTE: To test the diode while current below 0.060 mA at X 10K range; current

below 0.15 mA at X 1K range; current below 1.5 mA at X 100 range; current

below 15 mA at X 10 range; current below 150 mA at X 1 range.

2. For IF (forward current) test, put the BLACK test lead to the “-COM” jack and

the RED test lead to the Red “+” jack. And then connect the Black probe to the

Positive terminal of the Diode, the Red probe to the Negative terminal of the

Diode.

For IR (reverse current) test, reverse the connection.

3. Read the linear (forward voltage) VF of the diode on the LV scale.

Continuity Test

WARNING: DO NOT APPLY VOLTAGE TO MEASURING

TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.

Set the selector switch to the BUZZ range. Connect the test leads to two points of

circuit. If the resistance is lower than 200 Ohm approx., the Beeper sounds.

NOTE: Battery voltage is sufficient for Buzzer operation as long as the Zero Ohm

pointer can be adjusted to the Zero scale place.

NOTE: If connected incorrectly with the voltage, quickly remove the test leads

from the circuit as to avoid damage to this tester..

(This tester can afford the voltage <250V DC/AC rms. for the period of 3 seconds

max.)

Transistor hFE and LED Test

1. Set the selector switch to the R X 10 range.

FOR Measuring Transistor hFE

2. Take note the type of transistor “PNP” or “NPN” and then insert the transistor

terminals of the Emitter, Base and Collector separately into the proper holes of

the socket on the front panel.

3. Read the approximate hFE Value directly at the hFE scale.

NOTE: Current 10μA. VCE 2.8V.

4. When the Base terminal cut, the value of Leak is Iceo for Transistor.

FOR Measuring LED: Insert the transistor terminals directly into the E(Up) “+”

and C(Down) “-” holes of the socket on the front panel.

And then check if the LED under testing is lighting.

Battery Check

1. This meter comes with two separate battery check ranges to test either DC

1.2V /2.0V /3.0V or 3.6V batteries.

2. Set the selector switch to the appropriate BATT range to be used.

3. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the

Red “+” jack.

4. Connect the Red test lead to the positive end of battery and the Black one to

the negative end of the battery to be measured.

5. Take reading on the “BATT” scale and check it good or bad as per which portion

indicated.

(Note: the mark section of “?” shows that the battery may be starting to decay.)

NOTE: If connected incorrectly with the voltage, quickly remove the test leads

from the circuit and can avoid the damage to this tester.

(This tester can afford the voltage <250V DC/AC rms. for the period of 3 seconds

max.)

Decibels Measurement

1. Set the selector switch to AC 10V range.

2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the

Red “+” jack.

3. Connect the test leads to the measuring circuit specially in series with a

0.047μF/400V Metalized Polyester Capacitor. And then read the bottom Red dB

scale.

4. For more dB scope, change the selector switch to the others of ACV ranges and

make the same actions. Add the appropriate number of dB scale reading as

noted on the chart below.

NOTE: For absolute dB measurements, circuit impedance must be 600 Ohm. 0 dB

= 1mw dissipated in a 600 Ohm impedance (equivalent to 0.755V across 600

Ohm)

ACV RANGE

ADD dB Number

250

1000

Capacitance Measurement

WARNING: DO NOT APPLY VOLTAGE TO MEASURING TERMINAL WHILE

MAKING ANY CAPACITANCE MEASUREMENTS.

BEFORE TESTING ANY CAPACITORS, DISCHARGE THE CAPACITOR

COMPLETELY.

1) Set the selector switch to the C X1/X10/X100/X1K/X10K(R

X10K/X1K/X100/X10/X1) range.

2) Connect the BLACK test lead to the “-COM” jack and the RED test lead to

the Red “+” jack.

3) Connect the test leads to the capacitor to be measured (Note the polarity

of capacitor).

4) Watch the needle deflection to the right topside, and read the Red

C2000uF scale on the Dial.

Infrared remote-control test:

1) Set the selector switch to the “ ” range.

2) Point the infrared remote control at the instrument panel " " receiving

hole and press the remote-control button.

3) The red LED on the meter dial means that the remote control is normal. If

it is not bright, it means that the remote control cannot be normal.

TROUBLESHOOTING

Nevertheless, problems or malfunctions may occur.

For this reason, the following is a description of how you can eliminate possible

malfunctions yourself:

Error

Possible cause

The multimeter does not

work.

Are the batteries exhausted?

Check the state of the batteries and the

fuse 0.5A.

No measurements

possible via V/mA socket.

Is the fuse defective? Check the fuse 0.5A

(fuse replacement)

No measurements

possible via 10A socket.

Is the fuse defective? Check the fuse 10A

(fuse replacement)

No change in measured

values.

Have you selected the right measuring

sockets? Is the measuring range/mode

correct (AC/DC)?

Faulty measuring results

are displayed.

Has null balancing of the display or a 0

Ohm calibration for the resistance

measurement been carried out? Is the

batteries not properly assembled in?

MAINTENANCE

Replacement for Battery and/or Fuse should only be done after the

test leads have been disconnected and POWER OFF.

1. Battery Replacement

1) This tester uses 2pcs AAA size 1.5V batteries which are located under the lower

battery cover together with the big tilt device on the lower part of the rear case.

2) Note the condition of the batteries using the procedure described above, if the

battery needs to be replaced, open the lower tilt device on the rear case and

then turn the screw and take off the cover of the battery cabinet together with

the tilt device on the rear case.

3) Remove the spent batteries and replace them with a battery of the same type.

Observing polarity as indicated battery polarity marking on the bottom of the

battery compartments.

4) Replace the battery cabinet cover and tighten the screw.

2. Fuse Replacement

1) When the fuse needs replacement, use only UL-Listed 0.5A/250V fuse or

10A/250V fuse identical in physical size to the original type Φ5 x 20 mm.

2) Open the lower tilt device on the rear case and then turn the screw and take off

the cover of the battery cabinet together with the tilt device.

3) The old fuses inside their holders located on the PCB can be visible and access

to be removed. Then take off the melt fuses and install the new fuses into their

original places.

4) Replace the battery cabinet cover and tighten the screw.

NOTE: 2pcs stand-by fuses are provided and located beside the batteries under

the lower battery cover with rating marked below the fuses.

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