Brymen BM859s Manual de usuario
USER'S
MANUAL
BM857s
BM859s
1
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 / mAA : 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.
2
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
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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
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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.
5
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.
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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.
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.
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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.
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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).
Este manual sirve para los siguientes modelos
1
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