Pro's Kit MT-2019 Manuale utente

MT-2019

Protective Function Analog Multimeter

User’s Manual

1st Edition,2019

INTRODUCTION

This Multi-meter is an accurate, safe, battery operated, rear tilt-stand, easy to

operate handheld instrument with robust protective holster alongside and the

adjustable back tilt device with hook-up design. It can offer accurate, reliable

measurement of DC/AC Voltage, DC Current, Resistance and Diode, LED,

Transistor, Decibels, Continuity Buzzer and Capacitance with very high

sensitive quality movement, and good-designed circuit, as well as colorful

Aluminum dial plate etc. It has the perfect full overload & miss-used protection

via Fuses, Oxide Varactor & Diodes. It is an ideal instrument for indoor use in

the laboratory, school, workshop, hobby and home applications.

SPECIFICATIONS

Safety Category

IEC61010-1, CAT II 1000V, CAT III 500V and

Pollution Degree 2

Common

Environment

23C5C, less than 75% RH

Temperature

Ranges

0C to 40C, 32 F to 104 F for Operating

condition.

-10 C to 50C, 14 F to 122F for Storage

condition.

Humidity Scope

Operating condition less than 90% RH

Storage condition: less than 80% RH

Accessories

One set of Test Leads; One Spare Fuse:

0.5A/250V

Size

160(W) x 105(D)x 40(H) mm

Weight

390g approx. (including batteries 3pcs)

Test

Functions

Range

Accuracy

Remarks

DCV

0-0.1-2.5-10-50-

250V -1000V

3% FSD.

4% FSD.

For 1000V

Input Impendence:

20KΩ/V

Overload Protection:

Max. 1000V AC/DC

BUT at 0.1/2.5/10V,,

250V Max.

ACV

0-10-50-250V

-1000V

4% FSD.

5% FSD.

for 1000V

Input Impendence:

9KΩ/V

Overload Protection:

Max. 1000V AC/DC But

10V/50V only 250V

Max. Band width: 40

~10K Hz

DC mA

0-0.05-2.5-25-

250 mA,

3% FSD.

Drop Voltage: 250mV

Overload protected by

Fuses 0.5A/250V, and

Oxide Varactor. <250V

AC/DC(5s).

Ω

X1: 0.2 ~ 2KΩ

midscale at 20Ω

X10: 2~20KΩ

Midscale at 200Ω

X100:20~200KΩ

Midscale at

2000Ω

X1K: 200~ 2MΩ

Midscale at 20KΩ

X10K: 2K ~

20MΩ Midscale

at 200KΩ

4% of ARC

of Scale

Length

Overload protected by

the Oxide Varactor &

Fuse <250V AC/DC(5s).

Capacitance

(uF)

2000uF

Approximate

Value

Use the ΩX 1K range

BATT Check

0 ~ 1.5V: GOOD

- ? –BAD

0 ~ 9V: GOOD - ?

–BAD

5% of ARC

of Scale

Length

Load Current:

270mA for 1.5V, 25mA

for 9V.

Overload protected by

Fuse & Oxide Varactor

<250V AC/DC(5s).

Continuity

Check

Beeper sounding

under 200 Ohm

Overload protected by

Fuse & voltage

Suppressor <250V

AC/DC(5s).

Transistor

Check

hFE: 0-1000 via

special hFE

socket

Approximate

Value

At Ω X 10 Range

LED, Diode

Check

via special hFE

socket

Approximate

Value

At Ω X 10 Range

Decibel

-22 dB ~ + 62 dB

(0dB=1mW at

600Ω)

Approximate

Value

At ACV ranges

Power

Source

Internal Battery: R03, AAA, 1.5V 2pcs, 6F22, NEDA1604, 9V

1pc

CALIBRATION

ΩZero Adjustor located at the right side of the panel, adjusting the meter

pointer to the Zero mark on the right side of Ωscale of the meter dial when

the test leads are touched together.

Mechanical Adjustor Screw: located right 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.

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; 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 ΩX1 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 cells or 9V cell. (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 wotk 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 “OFF”

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 circuot as quickly as possible,

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

meter does not operate peoperly, check fuse. If it is blown replace it.

(See fuse replacement.)

OPERATION PROCEDURES

DC Voltage Measurement

WARNING: WITH EXTREME CARE WHEN MAKING MEASUREMENTS

FOR HUGH VOLTAGE, AND 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 you know the polarity of the circuit to be tested, connect the black

probe to the negative side.

4. 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.

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

AC Voltage Measurement

WARNING: WITH EXTREME CARE WHEN MAKING MEASUREMENTS

FOR HUGH VOLTAGE, AND 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. Check the needle position and the get the reading on V.A scale.

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 0.25A.

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.

Note: If connected incorrectly with the voltage at these ranges, 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 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 Ωrange 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 uppermost scale, if it doesn’t, use the 0

Ωadjust 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 Ω 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, quickly remove the test

leads from the circuit as to avoid the damage to this tester. (This tester

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

max.)

Diode Measurement

Set the selector switch to the appropriate Ωrange 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.

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.

1.Read the value IF or IR of the diode on the LI scale.

2.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 5

seconds max.)

Transistor hFE and LED Test

Set the selector switch to the Ω X 10 range.

For Measuring Transistor hFE

1. 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.

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

Note: Current 10μA. VCE 2.8V.

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

For Measuring LED

Insert the transistor terminals directly into the “+” and “-” holes of the

socket on the front panel.

And then check if the LED under testing is lighting.

Battery Check

1. This meter can come with two separate battery check ranges to test

either DC 1.5V or 9V 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 as to avoid the damage to this tester.

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

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 “Output” jack.

3. Connect the test leads to the measuring circuit, 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 ΩX 1K 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 C

scale on the Dial.

TROUBLESHOOTING

Nevertheless, problems or malfunctions may occur.

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

possible malfunctions by yourself:

Error

Possible cause

The multimeter does

not work.

Are the batteries exhausted? Is the power

indicator lit? 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 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 Ω

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

if the battery needs to be replaced, remove the screw and open the

upper cover of the battery cabinet on the rear case.

2) Take off 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.

3) 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

identical in physical size to the original type Φ5 x 20 mm.

2) Disassemble the side Holsters, and take off the screw, then open the

whole rear case. Remove the old fuse from its holder; install the new fuse

into it.

3) Replace the rear cover & Holsters, and tighten the screw.

Indice

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