Amprobe AM-120 TRMS Manuale utente

USER'S

MANUAL

AM-120 TRMS

AM-130 TRMS

AM-150 TRMS

Digital Multimeters

Version: 02/2008 / PAEB27309020

BEHA-AMPROBE GmbH

In den Engematten 14, 79286 Glottertal

Tel.: 07684 8009 - 0, Fax: 07684 8009 410

This manual is applicable to all meter protection versions or otherwise specified

1) SAFETY

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.

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 meters (all versions) are protected by double insulation per EN61010-1 and

IEC61010-1 2nd Edition (2001) to CAT III 1000V & CAT IV 600V. The meter (all

versions) also meets CSA C22.2 No. 1010-1-92* to CAT III 1000V.

Standard-version AM-120 & AM-130 Terminals (to COM) ratings:

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

A / mAμA : Category III and Category IV* 500 Volts AC and 300 Volts DC.

CF-version AM-150 (Highest-Protection) Terminals (to COM) ratings:

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

*Category IV safety standard (for DMMs) was first released in IEC61010-1 2nd Edition

in year 2001.

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.

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

μA/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 73/23/EEC and

Electromagnetic compatibility directive 89/336/EEC

3) PRODUCT DESCRIPTION

Panel Illustration

1) 3-4/5 digits 5000

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

function

5) Input Jack for all

functions EXCEPT

current (μA, mA, A)

functions

6) Common (Ground

reference) Input Jack for

all functions

7) Input Jack for milli-

amp and micro-amp

current functions

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.

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.

True RMS

True RMS is a term which identifies a DMM that responds accurately to the effective

RMS value regardless of the waveforms such as: square, sawtooth, triangle, pulse

trains, spikes, as well as distorted waveforms with the presence of harmonics.

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

Crest Factor

Crest Factor is the ratio of the Crest (instantaneous peak) value to the True RMS

value, and is commonly used to define the dynamic range of a True RMS DMM. A pure

sinusoidal waveform has a Crest Factor of 1.4. A badly distorted sinusoidal waveform

normally has a much higher Crest Factor.

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 means a good

ability to reject the effect of AC noise in DCmeasurements.

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 cause digit rattle or offset in voltage

measurements. This series has a CMRR specifications of >60dB 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.

4) OPERATION

DC Voltage, AC Voltage, & Hz Frequency functions

mV function defaults at DC. Press SELECT button momentarily to select AC. Press the

Hz push-button momentarily to activate or to exit Hz.

Note: Input sensitivity varies automatically with function range selected before

activating the Hz function. mV function has the highest (300mV) and the 1000V range

has the lowest (300V). 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 set the most appropriate trigger level. You can also press the RANGE

button momentarily to select another trigger level manually. If the Hz reading becomes

unstable, select lower sensitivity to avoid electrical noise. If the reading shows zero,

select higher sensitivity.

Capacitance, Diode test function

Default at . Press SELECT button momentarily to select Diode test function.

CAUTION

Discharge capacitors before making any measurement. Large value capacitors should

be discharged through an appropriate resistance load.

Normal forward voltage drop (forward biased) for a good silicon diode is between

0.400V to 0.900V. A reading higher than that indicates a leaky diode (defective). A zero

reading indicates a shorted diode (defective). An OL indicates an open diode

(defective). Reverse the test leads connections (reverse biased) across the diode. The

digital display shows OL if the diode is good. Any other readings indicate the diode is

resistive or shorted (defective).

Temperature function (AM-130 & AM-150 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.

Note: Be sure to insert the banana plug K-type temperature bead probe with correct

polarities. You can also use a plug adapter (Optional purchase) with banana pins

to K-type socket to adapt other standard K type mini plug temperature probes.



Resistance, Continuity functions

Default at . Press SELECT button momentarily to select Continuity function that is

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

beep tone indicates a complete wire.

CAUTION

Using resistance and continuity function in a live circuit will produce false results and

may damage the instrument. In many cases the suspected component must be

disconnected from the circuit to obtain an accurate reading

Auto leads resistance calibration

When entering the 50range manually by RANGE button for high precision low

resistance measurement, this feature will prompt you to short the inputs for calibration.

The display shows “Shrt”. Simply short the leads for about 3 seconds until the display

shows zero, then the resistance in the leads and in the internal protection circuitry of

the meter is compensated automatically. The compensation value can be as much as

5. If you need a compensation value that is higher than that, Relative mode is

recommended.

The shortcut is to short the test leads in auto-ranging resistance mode until the meter

enters the lowest 50



range automatically, press the RANGE button momentarily to

get the “Shrt” prompt, then wait about 3 more seconds until the display shows zero.

Note: The calibration stays until you change ranges, functions, or go back to auto-

ranging mode.

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