MTP 2326 Bedienungsanleitung

MTP

INSTRUCTION MANUAL

Digital Multimeter

Model MTP 2326

MTP Instruments Inc.

Table of Contents

TITLE

PAGE

1. GENERAL INSTRUCTIONS

1.1 Precaution safety measures

1.1.1 Preliminary

1.1.2 During use

1.1.3 Symbols

1.1.4 Instructions

1.2 Protection mechanisms

2. DESCRIPTION

2.1 Instrument Familiarization

2.2 LCD Display

2.3 Key pad

2.4 Terminals

2.5 Accessories

3. FUNCTION DESCRIPTION

3.1 General Functions

3.1.1 DATA HOLD mode

3.1.2 Battery saver

3.2 Measurement Functions

3.2.1 AC and DC Voltage measurement

3.2.2 Resistance measurement

3.2.3 Diode Test

3.2.4 Continuity Check

Ⅰ

Table of Contents

TITLE

PAGE

3.2.5 Capacitance measurement

3.2.6 Inductance measurement

3.2.7 Transistor measurement

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 Resistance

4.2.4 Diode Test

4.2.5 Continuity Check

4.2.6 Transistor

4.2.7 Inductance

4.2.8 Capacitance

4.2.9 DC Current

4.2.110AC Current

5. MAINTENANCE

5.1 General maintenance

5.2 Battery replacement

1. GENERAL INSTRUCTIONS

This instrument complies with IEC 61010-1, CAT. III 1000V

and CAT.Ⅳ600V overvoltage 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

1.1.1 Preliminary

*Measurement category Ⅳmeters are designed to protect

against transients from the primary supply level (overhead

or underground utilityservice).

* 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)

Ⅱ

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.

*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.

1.1.2 During use

* 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.

* 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, including manual or auto-ranging, 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 Ⅳ, or

1000V in Category III installations.

* Do not operate the Meter with the case (or part of the case)

removed.

1.1.3 Symbols:

Symbols used in this manual and on the instrument:

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

1.1.4 Instructions

* 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.

*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.

1.2 Protection mechanisms

*Fused by the fuse (FF400mA/1000V) during capacitance,

Inductance, mA and hFE measurements.

*A PTC resistor protects against permanent overvoltages of

up to 250V during resistance, continuity and diode test

measurements.

2. DESCRIPTION

2.1 Instrument Familiarization

1 LCD display 2. Keypad 3. Rotary switch 4. Terminals

2.2 LCD Display

See Table 1 indicated for information about the LCD display.

Figure 1.Display

Table 1. Display Symbols

Symbol

Meaning

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.

Indicator for ac voltage or current.

AC voltage and current are displayed as the

average of the absolute value of the input,

calibrated to indicate the equivalent rms

value of a sine wave.

Indicator for dc voltage or current.

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

V, mV

mV:

Volts. The unit of voltage.

Millivolt. 1x10-3 or 0.001 volts.

A, mA, A

mA:

A:

Amperes (amps).The unit of current.

Milliamp. 1x10-3 or 0.001 amperes.

Microamp. 1x10-6 or 0.000001 amperes

, k, M

:

k:

M:

Ohm. The unit of resistance.

Kilohm. 1x103or 1000 ohms.

Megohm. 1x106or 1,000,000 ohms.

mH,H

mH:

The unit of Inductance 1H=1000mH

F, nF

F:

nF:

Farad. The unit of capacitance.

Microfarad.1x10-6 or 0.000001 farads.

Nanofarad. 1x10-9 or 0.000000001

farads.

2.3 Keypad

See Table 2 indicated for information about the keypad

operations. Table 2. Keypad

Key

Function

Operation performed

Any switch position

turn the meter on or off

HOLD

Any switch position

Press HOLD to enter and

exit the Data Hold mode.

Any switch position

Press to turn the

backlight on. After about

5 seconds, the backlight

is auto-off.

2.4 Terminals

See Table 3 indicated for information about the terminals.

Table 3. Terminals

Terminal

Description

COM

Return terminal for all measurements.

（Receiving the black test lead or the “com”

plug of the special multi-function socket）

VHz

Input for voltage, resistance, frequency, diode

and continuity measurements. (Receiving the

red test lead)

hFE

Input for capacitance, Inductance, hFE and mA

current measurements.（Receiving the red test

lead or the “+”plug of the special multi-function

socket）

10A

Input for 200mA to 10A current measurements.

(Receiving the red test lead)

2.5 Accessories

Delivered with the multimeter:

User's manual

One piece

Test leads

One piece

Carry case

One piece

Special Multi-function socket

One piece

3. FUNCTION DESCRIPTION

3.1 General Functions

3.1.1 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.Asecond short press returns the meter to normal mode.

3.1.2 Battery Saver

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

automatic after approx. 20 minutes.

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 200.0mV, 2.000V,

20.00V, 200.0V and 1000V；AC voltage ranges are 2.000V,

20.00V, 200.0V and 7500V.

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.

Resistance is an opposition to current flow.

The unit of resistance is the ohm ().

The Meter's resistance ranges are 200.0, 2.000k,

20.00k, 200.0k, 2.000M, 20.00Mand 200.0M.

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.

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.

On 20Mand 200M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 overrange condition.

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.

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 yellowkey 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. 30,

a continuous beeping will indicate it.

Note:

Continuity test is available to check open/short of the

circuit.

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.

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 20.00nF, 200.0nF,

2.000F, and 200.0F.

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

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.

3.2.6 Inductance measurement

The unit of Inductance is the farad (H). The Meter's

Inductance ranges are 20.00mH, 200.0mH, 2.000H, and

20.00H.

To measure Inductance:

1. Set the rotary switch to proper range.

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

LXterminals respectively

3. Connect the test leads to the Inductance being

measured and read the displayed value.

3.2.7 Transistor measurement

To avoid electrical shock and/or damage to the

instrument, do not apply more than 250Vdc or

250Vac rms between the hFE

terminal and the

COM terminal.

1. Set the rotary switch to hFE range.

2. Connect the “com”plug and “+”plug of the special

multi-function socket to the COM and hFE terminals.

3. Determine whether the transistor to be tested is NPN or

PNP type and locate the Emitter, Base and Collector leads.

4. Insert leads of the transistor into proper holes of the

special multi-function socket.

5. The meter will show the approx. hFE value at test

condition of base current 10μA and Vce 2.8V.

3.2.8 Current measurement

To avoid damage to the Meter or injury if the fuse

blows, never attempt an in-circuit current

measurement where the open-circuit potential to

earth is greater than 250V.

To avoid damage to the meter, check the meter's

fuse before proceeding. Use the proper terminals,

function, and range for your measurement. Never

place the test leads in parallel with a circuit or

component when the leads are plugged into the

current terminals.

Current is the flow of electrons through a conductor.

The Meter's DC current ranges are 200.0mA and 10.00A；

AC current ranges are 200.0mA and 10.00A.

To measure current:

1. Turn off the power of the measured circuit. Discharge all

the high voltage capacitors.

2. Set the rotary switch to the proper range.

3. Connect the black test lead to the COM terminal and

the red test leads to the mA terminal for a maximum of

200mA. For a maximum of 10A, move the red test lead

to the 10A terminal.

4. Break the circuit path to be tested.

Connect the black test lead to the more negative side of

the break; connect the red test lead to the more positive

side of the break. (Reversing the leads will give a

negative reading, but will not damage the Meter.)

5. Turn on the power of the measured circuit, and then

read the display. Be sure to note the measurement

units at the right side of the display (mA or A). When

only the figure "1" displayed, it indicates overrange

situation and the higher range has to be selected.

6. Turn off the power of the measured circuit and discharge

all the high voltage capacitors. Remove the test leads and

recover the measured circuit.

4 TECHNICAL SPECIFICATIONS

4.1 GENERAL SPECIFICATIONS

Environment conditions:

1000V CAT. III and 600V CAT.Ⅳ

Pollution degree: 2

Altitude < 2000m

Operating temperature:

0~40℃, 32℉~122℉(<80% RH, <10℃noncondensing)

Storage temperature:

-10~60 ℃, 14℉~140℉(<70% RH, battery removed)

Temperature Coefficient:

0.1(specified accuracy) / ℃(<18℃or >28℃)

MAX. Voltage between terminals and earth ground:

750V AC rms or 1000V DC.

Fuse Protection: mA: fuse (FF400mA/1000V)

A: fuse (FF10A/500V)

Sample Rate: 3 times/sec for digital data.

Display: 3 1/2 digits LCD display. Automatic indication of

functions and symbols.

Over Range indication: LCD will display "1".

Low battery indication:

The " " is displayed when the battery is under the proper

operation range.

Polarity indication: "" displayed automatically.

Power source: 9V

Battery type: NEDA1604, 6F22, or 006P.

Dimensions: 188(L)92(W)50(H) mm.

Weight: 380g. Approx. (battery included).

4.2 Measurement specifications

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