Brymen BM821 Manuale utente

USER'S MANUAL

BM821, BM822, BM827, BM829

BM521, BM525

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 meter protection rating, against the users, is double insulation per IEC61 1 -1 2nd Ed.,

EN61 1 -1 2nd Ed., UL61 1 -1 2nd Ed. and CAN/CSA C22.2 No. 61 1 .1- .92 to Category

IV 1 Volts AC & DC.

BM821, BM822, BM827 & BM829 Terminals (to COM) measurement category:

V : Category IV 1 Volts AC & DC

mAµA : Category IV 6 Volts AC and 3 Volts DC

A : Category IV 6 Volts AC and 3 Volts DC

BM521 & BM525 Terminals (to COM) measurement category:

V / mAµA / A : Category IV 1 Volts AC & DC

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

Measurement Cate ory 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 Cate ory 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 Cate ory 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 6 VDC or 3 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 2 6/95/EC and

Electromagnetic compatibility directive 2 4/1 8/EC

3) PRODUCT DESCRIPTION

Note: Top of the line model is used as representative for illustration purposes. Please refer to

your respective model for function availability.

Analo bar- raph

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.

1) 4 digits 9999 counts dual

displays

2) Push-buttons for special

functions & features

3) Selector to turn the Power On

or Off and Select a function

4) Input Jack for 1 A (2 A for

3 sec) current function

5) Common (Ground reference)

Input Jack for all functions

6) Input Jack for all functions

EXCEPT current (µA, mA, A)

functions

7) Input Jack for milli-amp and

micro-amp current functions

Avera e sensin 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.

4) OPERATION

CAUTION

Before and after hazardous voltage measurements, test the voltage function on a nown

source such as line voltage to determine proper meter functioning.

AutoCheck

mode (525, 521, 829 only)

This innovative AutoCheck

feature automatically selects measurement function of DCV,

ACV or Resistance (Ω) based on the input via the test leads.

●With no input, the meter displays “Auto” when it is ready.

●With no voltage signal but a resistance below 6 MΩ is present, the meter displays the

resistance value. When below “Audible Threshold“ is present, the meter further gives a

continuity beep tone.

●When a signal above the threshold of 1.5V DC or 3V AC up to the rated 1 V is present,

the meter displays the voltage value in appropriate DC or AC, whichever larger in peak

magnitude.

Note:

*Range-Lock and Function-Lock Feature: When a measurement reading is being

displayed in AutoChec

mode, press the RANGE or SELECT button momentarily 1 time

can loc the range or function it was in. Press the button momentarily repeatedly to step

through the ranges or functions.

*As azardous-Alert: When ma ing resistance measurements in AutoChec

mode, an

unexpected display of voltage readings alerts you that the object under test is being

energized.

*Ghost-voltage Buster: Ghost-voltages are unwanted stray signals coupled from adjacent

hard signals, which confuse common multimeter voltage measurements. Our AutoChec

mode provides low (ramp-up) input impedance (approx. 3 Ω at low voltage) to drain ghost

voltages leaving mainly hard signal values on meter readings. It is an invaluable feature for

precise indication of hard signals, such as distinguishing between hot and open wires (to

ground) in electrical installation applications.

WARNING:

AutoChec

mode input impedance increases abruptly from initial 3 Ω to a few hundred

Ω’s on high voltage hard signals. “LoZ” displays on the LCD to remind the users of being in

such low impedance mode. Pea initial load current, while probing 1000VAC for example,

can be up to 471mA (1000V x 1.414 / 3 Ω), decreasing abruptly to approx. 3.1mA (1000V x

1.414 / 460 Ω) within a fraction of a second. Do not use AutoChec

mode on circuits that

could be damaged by such low input impedance. Instead, use rotary selector or high

input impedance voltage modes to minimize loading for such circuits.

dBm

+Hz

(829 only), Hz

+ACV

, ACV

+Hz

functions

Press the SELECT button momentarily to select the subject functions in sequence. Last

selection will be saved as power up default for repeat measurement convenience.

Note: Hz Input sensitivity varies automatically with voltage (current function alike) range

selected. 1V range has the highest and the 1 V range has the lowest. Auto-ranging

measurements normally set the most appropriate trigger level. You can also press the

RANGE button momentarily to select another trigger level (voltage range) manually. If the

Hz reading becomes unstable, select higher voltage range to avoid electrical noise. If the

reading shows zero, select lower voltage range.

Note: In dBm

+Hz

function, power up default reference impedance will be displayed for 1

second before displaying the dBm readings. Press dBm-Ω

ΩΩ

Ω (RANGE) button momentary to

select different reference impedance of 4, 8, 16, 32, 5 , 75, 93, 11 , 125, 135, 15 , 2 ,

25 , 3 , 5 , 6 , 8 , 9 , 1 , up to 12 Ω

ΩΩ

Ω. Last selection will be saved as power up

default for repeat measurement convenience. Manual trigger level selection on Hz reading is

not available.

DC+ACV

+ACV

(525, 521, 829 only), DCV, DCV

+ACV

functions

Press the SELECT button momentarily to select the subject functions in sequence. Last

selection will be saved as power up default for repeat measurement convenience.

525, 521, 829:

DCmV, DCmV

+ACmV

, DC+ACmV

+ACmV

, Lo ic-Level Hz & Duty%

Press the SELECT button momentarily to select the subject functions in sequence. Last

selection will be saved as power up default for repeat measurement convenience.

827, 822, 821:

DCmV, DCmV

+ACmV

, Lo ic-Level Hz & Duty%

Press the SELECT button momentarily to select the subject functions in sequence. Last

selection will be saved as power up default for repeat measurement convenience.

ACmV

+Hz

, dBm

+Hz

(829 only), Hz

+ACmV

functions

Press the SELECT button momentarily to select the subject functions in sequence. Last

selection will be saved as power up default for repeat measurement convenience.

nS Conductance (525, 521, 829, 827 only), Ω

ΩΩ

Ω Resistance, Continuity functions

Press the SELECT button momentarily to select the subject functions in sequence for

models 525, 521, 829 and 827. Last selection will be saved as power up default for repeat

measurement convenience. Direct rotary switch selection on Ω

ΩΩ

Ω Resistance and

Continuity functions for models 822 and 821.

Note:

Conductance is the inverse of Resistance, that is S=1/Ω or nS=1/GΩ. It virtually extends the

Resistance measurements to the order of Giga-Ohms for leakage measurements.

Continuity function 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

Temperature functions (525, 521, 829, 827 only)

Press SELECT button momentarily to toggle between °C and °F readings. For Dual Channel

Temperature function models 829 & 525, press T1-T2 (RANGE) button momentarily can

select T1, T2, T1

+T2

or T1-T2

+T2

readings. Last selection will be saved as power up default

for repeat measurement convenience.

Note: Be sure to insert the banana plug type-K temperature bead probe Bkp6 with correct

polarities. You can also use a plug adapter Bkb32 (Optional purchase) with banana

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

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