Brymen BM859s Manuale utente

USER'S

MANUAL

BM857s

BM859s

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

IEC/UL/EN61010-1 Ed. 3.0, IEC/EN61010-2-030 Ed. 1.0, IEC/EN61010-2-033 Ed. 1.0,

IEC/UL/EN61010-031 Ed. 1.1 and CAN/CSA-C22.2 No. 61010-1-12 Ed. 3.0 to

Category III 1000 Volts AC & DC and Category IV 600 Volts AC & DC.

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.

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. Only use the test lead provided with the equipment or UL Listed Probe

Assembly rated CAT III 1000V or better.

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

3) PRODUCT DESCRIPTION

Panel Illustration

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

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

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 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.

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.

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.

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.

T1-T2 Dual Channels Temperature function (Model 859s 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 Bkp60 (standard

accessory x 1) with correct polarities. Dual channels T1-T2 readings require 2

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

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

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.

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.

Capacitance, Diode test function

Press SELECT button momentarily to toggle between Capacitance and

Diode test functions. The new setting will be saved automatically to the non-volatile

memory as power up default.

CAUTION

Discharge capacitors before making any measurement. Large value capacitors should

be discharged through an appropriate resistance load.

Note: 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).

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