Extech Instruments MultiMaster MM560A Manual de usuario

User’s Guide

MultiMaster™ Digital MultiMeter Series

With PC Interface

Models:

MM560A

MM570A

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1) SAFETY

This manual contains information and warnings that must be followed for operating the instrument

safely and maintaining the instrument in a safe operating condition. If the instrument is used in a

manner not specified by the manufacturer, the protection provided by the instrument may be impaired.

The meter is intended only for indoor use.

The meter protection rating, against the users, is double insulation per IEC61010-1 2nd Ed.,

EN61010-1 2nd Ed., UL61010-1 2nd Ed. and CAN/CSA C22.2 No. 61010.1-0.92 to Category III 1000

Volts AC & DC and Category IV 600 Volts AC & DC.

MM560A Terminals (to COM) measurement category:

V : Category III 1000 Volts AC & DC, and Category IV 600 Volts AC & DC.

A / mAA : Category III and Category IV 600 Volts AC and 300 Volts DC.

MM570A Terminals (to COM) measurement category:

V / A / mAA : Category III 1000 Volts AC & DC, and Category IV 600 Volts AC & DC.

Per IEC61010-1 2nd Ed. (2001) Measurement Category

Measurement Category IV (CAT IV) is for measurements performed at the source of the low-voltage

installation. Examples are electricity meters and measurements on primary overcurrent protection

devices and ripple control units.

Measurement Category III (CAT III) is for measurements performed in the building installation.

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 (CAT II) is for measurements performed on circuits directly connected to

the low voltage installation. Examples are measurements on household appliances, portable tools and

similar equipment.

TERMS IN THIS MANUAL

WARNING identifies conditions and actions that could result in serious injury or even death

to the user.

CAUTION identifies conditions and actions that could cause damage or malfunction in the

instrument.

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WARNING

To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. To avoid

electrical shock hazard, observe the proper safety precautions when working with voltages above 60

VDC or 30 VAC rms. These voltage levels pose a potential shock hazard to the user. Do not touch test

lead tips or the circuit being tested while power is applied to the circuit being measured. Keep your

fingers behind the finger guards of the test leads during measurement. Inspect test leads, connectors,

and probes for damaged insulation or exposed metal before using the instrument. If any defects are

found, replace them immediately. Do not measure any current that exceeds the current rating of the

protection fuse. Do not attempt a current measurement to any circuit where the open circuit voltage is

above the protection fuse voltage rating. Suspected open circuit voltage should be checked with

voltage functions. Never attempt a voltage measurement with the test lead inserted into the A/mA or

A input jack. Only replace the blown fuse with the proper rating as specified in this manual.

CAUTION

Disconnect the test leads from the test points before changing functions. Always set the instrument to

the highest range and work downward for an unknown value when using manual ranging mode.

INTERNATIONAL ELECTRICAL SYMBOLS

!Caution ! Refer to the explanation in this Manual

Caution ! Risk of electric shock

Earth (Ground)

Double Insulation or Reinforced insulation

Fuse

AC--Alternating Current

DC--Direct Current

2) CENELEC Directives

The instruments conform to CENELEC Low-voltage directive 2006/95/EC and Electromagnetic

compatibility directive 2004/108/EC

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3) PRODUCT DESCRIPTION

Panel Illustration

1) 5-4/5 digits 500000

counts LCD display

2) Push-buttons for special

functions & features

3) Selector to turn the Power

On or Off and Select a

function

4) Input Jack for 10A (+)

(20A for 30sec) current, and

for T2 (-) function

5) Input Jack (+) for all

functions EXCEPT current

(



A, mA, A) and T2

functions

6) Common (Ground

reference) Input Jack (-) for

all functions EXCEPT T2

function

7) Input Jack (+) for

milli-amp, micro-amp, and

T2 (+) functions

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Average sensing RMS calibrated

RMS (Root-Mean-Square) is the term used to describe the effective or equivalent DC value of an AC

signal. Most digital multimeters use average sensing RMS calibrated technique to measure RMS

values of AC signals. This technique is to obtain the average value by rectifying and filtering the AC

signal. The average value is then scaled upward (calibrated) to read the RMS value of a sine wave. In

measuring pure sinusoidal waveform, this technique is fast, accurate, and cost effective. In measuring

non-sinusoidal waveforms, however, significant errors can be introduced because of different scaling

factors relating average to RMS values.

AC True RMS

AC True RMS, normally refers as True RMS, identifies a DMM function that is AC coupled, and

responds accurately only to the effective RMS AC component value regardless of the waveforms.

However, DC component plays an important role in the distorted non-symmetrical waveforms, and will

also be of interest sometimes. A full wave rectified sine waveform is a good example, and the AC true

RMS function will only give the AC component reading which is at 43.6% of the total effective DC+AC

RMS reading.

DC+AC True RMS

DC+AC True RMS calculates both of the AC and DC components given by the expression

when making measurement, and can responds accurately to the

total effective RMS value regardless of the waveform. Distorted waveforms with the presence of DC

components and harmonics may cause:

1) Overheated transformers, generators and motors to burn out faster than normal

2) Circuit breakers to trip prematurely

3) Fuses to blow

4) Neutrals to overheat due to the triplen harmonics present on the neutral

5) Bus bars and electrical panels to vibrate

AC Bandwidth

AC bandwidth of a DMM is the range of frequencies over which AC measurements can be made within

the specified accuracy. It is not the frequency measurement function, and is the frequency response of

the AC functions. A DMM cannot accurately measure the AC value with frequency spectrums beyond

the AC bandwidth of the DMM. Therefore, wide AC bandwidth plays an important role in high

performance DMMs. In reality, complex waveforms, noise and distorted waveforms contain much

higher frequency spectrum than its fundamental.

NMRR (Normal Mode Rejection Ratio)

NMRR is the DMM's ability to reject unwanted AC noise effect that can cause inaccurate DC

measurements. NMRR is typically specified in terms of dB (decibel). This series has a NMRR

specification of > 60dB at 50 and 60Hz, which is a good and definite ability to reject the effect of AC

noise when making DC measurements.

CMRR (Common Mode Rejection Ratio)

Common mode voltage is voltage present on both the COM and VOLTAGE input terminals of a DMM,

with respect to ground. CMRR is the DMM's ability to reject common mode voltage effect that can

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cause digit rolling or offset in voltage measurements. This series has a CMRR specifications of > 80dB

at DC to 60Hz in ACV function; and > 120dB at DC, 50 and 60Hz in DCV function. If neither NMRR nor

CMRR specification is specified, a DMM's performance will be uncertain.

Analog bar-graph

The analog bar graph provides a visual indication of measurement like a traditional analog meter

needle. It is excellent in detecting faulty contacts, identifying potentiometer clicks, and indicating signal

spikes during adjustments. Analog bar-graph is not available in AC+DC True RMS Voltage & Current

modes.

4) OPERATION

CAUTION

Before and after hazardous voltage measurements, test the voltage function on a known source such

as line voltage to determine proper meter functioning.

AC Voltage, DC Voltage, DC+AC Voltage, & Hz Line Level Frequency

In AC Voltage, press SELECT button momentarily to toggle between AC and dBm. In DC Voltage,

press SELECT button momentarily to toggle between DC, and DC+AC. In mV Voltage, press SELECT

button momentarily to select DC, AC, or DC+AC. The new settings will be saved automatically to the

non-volatile memory as power up default. In DCV and DCmV, press 500000 button momentarily to

toggle between 4-4/5 digits and 5-4/5 digits readings. In voltage or current functions, press the

Hz push button momentarily to activate or to exit Line Level Frequency measuring function. Line

Level Frequency measuring function is designed especially for noisy electrical high voltage signals.

Note: In dBm function, power up default reference impedance will be displayed for 1 second before

displaying the dBm readings. Press dBm-(RANGE) button momentary to select different reference

impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up

to 1200. The new impedance value will be saved automatically to the non-volatile memory as power

up default.

A A A

dBm dBm-Ω dBm

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A A A

DCV ACV Hz

Note: Line Level Frequency measuring function input sensitivity varies automatically with voltage (or

current) function range selected. The lower the measuring range the higher the sensitivity. That is, mV

function has the highest and the 1000V range has the lowest as in voltage function ranges. It is

recommended to first measure the signal voltage (or current) level then activate the Hz function in that

voltage (or current) range to automatically get the most appropriate trigger level. When activated from

voltage function, you can also press the RANGE button momentarily to select another trigger level

range manually. The analog bargraph pointer will point at the selected trigger level range scale 1, 2, 3,

or 4. If the Hz reading is unstable, select lower sensitivity to avoid electrical noise. If the reading shows

zero, select higher sensitivity.

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Hz Logic Level Frequency and % Duty Cycle functions

Press SELECT button momentarily to toggle between Hz and % (duty cycle) readings. The new

setting will be saved automatically to the non-volatile memory as power up default. Press 500000

button momentarily to toggle between 5 full digits and 6 full digits Hz readings.

A A A

Note: Unlike the Line Level Frequency measuring function as previously stated, this Logic Level

Frequency function is set only at the highest input sensitivity for measuring digital type electronic

signals.

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T1-T2 Dual Channels Temperature function (MM570A only)

Press SELECT button momentarily to toggle between C and F readings, and the new setting will be

saved automatically in the non-volatile memory as power up default. Press T1-T2 (RANGE) button

momentarily to select T1, T2, or T1-T2 readings.

Note: Insert the banana plug K-type temperature bead probe with correct polarities. Dual

channels T1-T2 readings require 2 probes.

A A A

T-T

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Resistance, Continuity functions

Press SELECT button momentarily to toggle between and Continuity functions. The new

setting will be saved automatically to the non-volatile memory as power up default. Continuity function

is convenient for checking wiring connections and operation of switches. A continuous beep tone

indicates a complete wire.

A A

CAUTION

Using resistance or continuity function in a live circuit will produce false results and may damage the

meter. In many cases the suspected component must be disconnected from the circuit to obtain an

accurate reading.

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