MTP 2326 Instruction Manual

MTP

INSTRUCTION MANUAL

Digital Multimeter

Model MTP 2326

MTP Instruments Inc.

Table of Contents

TITLE

PAGE

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

4

1.2 Protection mechanisms

5

2. DESCRIPTION

6

2.1 Instrument Familiarization

6

2.2 LCD Display

7

2.3 Key pad

8

2.4 Terminals

9

2.5 Accessories

9

3. FUNCTION DESCRIPTION

10

3.1 General Functions

10

3.1.1 DATA HOLD mode

10

3.1.2 Battery saver

10

3.2 Measurement Functions

11

3.2.1 AC and DC Voltage measurement

11

3.2.2 Resistance measurement

12

3.2.3 Diode Test

12

3.2.4 Continuity Check

13

Ⅰ

Table of Contents

TITLE

PAGE

3.2.5 Capacitance measurement

14

3.2.6 Inductance measurement

14

3.2.7 Transistor measurement

15

3.2.8 Current measurement

15

4. TECHNICAL SPECIFICATIONS

17

4.1 General specifications..

17

4.2 Measurement specifications

17

4.2.1 DC Voltage

18

4.2.2 AC Voltage

18

4.2.3 Resistance

18

4.2.4 Diode Test

19

4.2.5 Continuity Check

19

4.2.6 Transistor

19

4.2.7 Inductance

19

4.2.8 Capacitance

19

4.2.9 DC Current

20

4.2.110AC Current

20

5. MAINTENANCE

21

5.1 General maintenance

21

5.2 Battery replacement

21

1. GENERAL INSTRUCTIONS

This instrument complies with IEC 61010-1, CAT. III 1000V
and CAT.Ⅳ 600V 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 Ⅳ meters 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

1

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

2

3

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.

4

5