SZBJ BM802A User manual

1
BM802A INSTRUCTION MANUAL
Ⅰ. Introduction
Welcome to use this product.
The updated BM802A adopts high-performance MCU processor,it is Great Value
as has high reliability,security, automatically setting range funcition,hand-held clamp
meter etc.. the product has a large digital display, full range overload
protection, data-hold function, undervoltage indication, auto shut off function,it
has TRUE RMS measurement function which can accurately
measure frequency voltage, non-sinusoidal voltage and inrush current measurement
function which can measure inrush current about 80mS RMS, it also has temperature
measurement function which can accurately measured -50~1000 ℃, the instrument is
suitable for frequency-converting power supply, air conditioning, refrigeration
equipment such as refrigerators, motor performance test, It is more excellent for a
new generation of practical electrical measuring instrument .
This product is ideal instrument for test, maintenance and repais in college,
smelting, communications, manufacturing, petroleum, electric power, national
defense,electronic, electric power equipment .
Ⅱ. Safety standard
The meter in structure complies with the safety requirements of ICE61010-1. Read
the instruction carefully as follows before you use the meter:
1. When measuring voltage, AC or DC voltage should not be more than the peak
voltage (DC / AC 1000V) of the meter.
2. Voltage of less than 36V is safety voltage. When the voltage is more than DC 51V
or AC36V, the leads should be checked. The test lead should be connected correctly
and their insulating property should be under excellent status against electric shock.
3. When change of functional measuring range, the test lead should be away from test
point.
4.It is suggested that for safety the functions and range should be selected correctly
although protective function for the full measuring range exists.
5.When measurement of current, the input current shouldn’t be more than the
maximum current labeled on input end.
6. Safety symbols:
Warning!
risk of high voltage and electric shock!
Double insulated.
Ⅲ. Features
3.1 General
3.1.1The meter is based on CMOS large scale IC and can automatically changed
measuring range for measurement of AC/DC voltage, AC, resistance, frequency and
capacity, which makes the meter easy to be used.
3.1.2 Display mode: Display by LCD.
3.1.3 Maximum display: 3999
3.1.4 Maximum span of jaw: 52mm.
3.1.5 Auto negative polarity indication: Displaying “-”.
3.1.6 Lack of battery power: Displaying “ ”.
3.1.7 Auto power OFF
After turning on the instrument and without turning the function switch or
pressing any button, the instrument will automatically enter into sleep mode after 10
minutes,to save battery power.when it is in the sleep mode you can press the SELECT
key to wake up the instrument. If you don't need the automatic sleep mode, you
should hold down the DH key to turn on the instrument, and then the symbol" "
will not be display on the LCD.
3.1.8 Work environment: 0C-40C, 75%RH.
3.1.9 Storage environment: -10C-60C, 85%RH.
3.1.10 battery ： 3V (AA1.5V×2)
3.1.11External dimensions: 249（L）×89（W）×38（H）mm
3.1.12Weight: About 360g (including battery’s weight)
3.2 Technical specifications
Accuracy：±(% reading + digit); calibration term is one year.
Ambient temperature: 23C±5C; Ambient humidity: ≤70%RH
3.2.1 DCV
Range Accuracy Resolution Input impendance
400mV 0.1mV About 10MΩ
4V 1mV About 10MΩ
40V 10mV About 10MΩ
400V
±(0.8%+2d)
100mV About 10MΩ
1000V ±(1%+3d) 1V About 10MΩ
3.2.2 ACV
Range Accuracy Resolution Input impendance
400mV 0.1mV About 10MΩ
4V 1mV About 10MΩ
40V 10mV About 10MΩ
400V
±(1.2%+5d)
100mV About 10MΩ
700V ±(1.5%+5d) 1V About 10MΩ
Frequency：10Hz~1kHz (Warning：Frequency for square wave accuracy is specified
from 10Hz to 400Hz)，display：TRUE RMS(sinusoidal waveform RMS calibration)。
Overload protection:250V at mV range,DC1000V or peak value AC1000V at V range
3.2.3 ACA
Range Accuracy Resolution
4A 1mA
40A 10mA
400A 100mA
1000A
±(2%+10d)
1A
AC Conversion Type： TRUE RMS responding, calibrated readings consistent with
sinusoidal waveform RMS. Frequency Range:50~60Hz。
3.2.5 Resistance 
Range Accuracy Resolution
400Ω 0.1Ω
4kΩ 1Ω
40kΩ 10Ω
400kΩ 100Ω
4MΩ
±(1%+3d)
1kΩ
40MΩ ±(1.5%+5d) 10kΩ
Overload protection: effective value 220V
3.2.5 Capacitance
Range Accuracy Resolution
10nF ±（3%+20d） 0.001nF
100nF 0.01nF
1uF 0.1nF
10uF 1nF
100uF 10nF
1000uF
±（3%+5d）
100nF
10mF ±（5%+5d） 1uF
Overload protection: effective value 250V
warning：There is about 20pF dead zone in the 10nF,capacitance below 20pF can
not be measured
3.2.6 Frequency
Range Accuracy Resolution
100Hz 0.01Hz
1kHz 0.1Hz
10kHz 1Hz
100kHz 10Hz
1MHz 100Hz
10MHz 1kHz
40MHz
±（0.5%+3d）
10kHz
Overload protection: effective value 250V. Input sensitivity RMS: effective value 1V.
NOTE:If the voltage of the frequency being measured is above 30V,set the rotary
function switch to the ACV measured function and press “SELECT”key to enter
voltage frequency measured function,in order to avoid demage the instrument.
3.2.6 DUTY
Rrange Accuracy Resolution
1%~99% ±（0.5%+3d） 0.1%
Overload protection: effective value 250V.
input sensitivity RMS：1V
3.2.8 Temperature
Range Resolution Accuracy
-50～300℃ 1℃ ±1%±5
301～1000℃ 1℃ ±1.9%±5
-58～600 oF 1 oF ±1.2%±6
601～1832 oF 1 oF ±1.9%±6
Temperature sensor: K WRNM- 010 bare contact thermojunction
Overload protection：effective value 250V.
3.2.9 Forward voltage drop of diode
Displaying approximate forward voltage values of diode. Measuring condition:
forward direct current is 1.5mA; opposite DC voltage is about 3 V.
3.2.10 Continuity Test
In the case that the resistance between two tested points is less than about
90±20,the buzzer will bring up sound. Test condition:Open-circuit voltage is
about 0.5V.
Ⅳ．Operation
4.1 Instruction for control panel
（1） jaws
（2） Trigger
（3） Rotary switch ：This switch is used to select functions such as
current.voltage,capacitance.resistance,temperature,frequency,forward voltage drop of
diode,continuity and turn on/off the meter.
（4） “SELECT” button: When press the key continuously, change the range of all
function for a proper range you need.
（5）“RANGE” button: One may change the measuring range by pressing this button,
press this key to cycle from small to large range of each function

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（6）INRUSH:measuring Inrush voltage, current key,in AC measuring function press
the key,it will measure the Inrush value, and show the "INR" symbol in the
LCD, INRUSH function can measure current or voltage with the minimum period up
to valid values80mS,in the inrush mode, instrument automatically enter the manual
range function, if the measurement range is unknowed , press RANGE key to the
maximum range, first press the INRUSH button again inrush measurement will be
resumed, and the "INR" symbol disappear.
（7）“DH” button: The user may hold the present reading and keep it on the display
by pressing the “DH” button. Press the button again to concel the data-hold function
（8）LCD display
（9）“V”jack: This is positive input terminal for voltage,resistance
frequency,temperature,capacity and diode.
（10） “COM”jack:This is negative(ground)input terminal
(11) Barrier
4.2 Measurement of AC/DC voltage
Turn the Rotary switch to “V”. Then plug black lead in “COM” socket, and plug
red lead in “V/” socket. connect the test lead with the two ends of the circuit and
then directly read the reading on the LCD display
NOTE: 1. The inrush measuring funciton can only be change range manually, before
the test,if the voltage is unknown, manually set the measuring range to 700V and then
press the PH key to enter the INRUSH measuring function.
2. Don't measure the peak voltage more than 1000V, otherwise it might damage the
instrument ,if the screen only displays OL, it means that the tested voltage is higher
than DC1000V or AC700V.
3. Presse the SRLECT key in the ACV function to enter the voltage frequency
measurement mode, it can measure the the frequency range from 10Hz to 100KHz
with voltage higher than AC 30V~700V.
4.3 AC current measurement
Turn rotary switch to“~A” range. Press the trigger, opens the mouth of the
clamp, and hold wire ( put the wire in the clamp center ), read the reading directly
Note:1.INRUSH measuring can only be manually setting range. when the
current value being measuring is unknow, turn the rotary switch to 1000A and
press INRUSH key to entry INRUSH measuring funciton.
2. When measuring current ,the clamp might hold only one wire,it is null to
catch one more another wire
4.4 Measurement of resistance,continuity and forward Voltage drop of diode
Warning! When measurement of resistance or continuity, make sure that no
voltage is with the circuit and components.
（1）Turn the Rotary switch to the range of Ω/ / . At this time, the meter is
reserved at resistance range.
（2）Plug red lead in “V/Ω” socket, and plug black lead in “COM” socket
（3）Connect the leads with the two ends of the circuit or component, and then read
the value of resistance.
（4）Press SELECT key to change the range of . When the resistance measured
is less than about 90±20, the buzzer sounds. This is continuity testing.
（5）When the test lead is under open-circuit or input-overload status, the display will
display “OL”.
（6）When measuring diode,press the SELECT key to the function of .
（7）Connect the test lead with the two ends of the diode, and then read the value of
forward voltage drop value.
（8）When the test lead is under reverse connection or open-circuit status, the display
will display “OL”.
Note：a、When the resistance measured is above 1MΩ, it needs several seconds for
the reading to be stable, it is normal when measuring high resistance.
b、When measuring high resistance, insert the resistance pin directly into the V Ω and
COM jack, so as to avoid interference
c、When measuring resistance in a circuit make sure the power to the circuit is turned
off and all capcitors are discharged,
4.5 Measurement of capacitance
Warning! When measurement of capacity, the measured capacitor should be
completely discharged.
（1）Turn the Rotary switch to “CAP” function. Plug red lead in “V/Ω” socket, and
plug black lead in “COM” socket.
Warning:The range for capacitor can’t be set manually. When the capacity value
is large, the time for measurement may be a little longer.
a. Do not take an external voltage or charged capacitor (especially a large
capacitor) connected to the test terminal
b. When a large capacitor is serious leakage or breakdown, the measurement value
may be instability
4.6 Measurement of frequency / DUTY Ratio
（1）Turn the Rotary switch to “Hz” function.if you want to measure DUTY
Ratio,Press SELECT key to switch
（2）Plug red test lead in “V/Ω” terminal and plug black lead in “COM” terminal.
（3）Connect the leads with measured circuit and then read the reading.
（4）when the voltage exceeding 30V, please enter the Voltage frequency
measurement mode by pressing the SELECT key in the “ACV” measurement
function.
4.7 Measurement of temperature
Turn the Rotary switch to the function of temperature, then plug the cold end
(plug end) of temperature sensor to the V/Ωand COM socket(black end for COM
socket and red end for V/Ω socket). Place the working end (temperature end) of the
sensor on or in the measured object. Then read the temperature value (in ) on the ℃
display. If you need to measure that “OF”, presses the SELECT key to switch.
Caution: When the cold terminal of the sensor isn’t inserted into the meter, the
meter might display approximate environmental temperature. K WRNM- 010 bare
contact thermojunction has a limiting temperature of 250℃ (300℃ for short time).
4.8 NON CONTACT VOLTAGE TESTING
Turn the Rotary switch to the “ ” function, then the LCD display NCV and ~
symble, plug red test lead in the “V/Ω” terminal and black lead without being
used,place the red test lead near the electric line, switch,or socket,the phase metal
terminal need not to be connected,when the detected voltage is above AC RMS
110V,a reverse C will be displayed on the LCD,the higer the testing voltage is ,the
more reverse C will be display,with buzzer alarm sounds more intensive.
When the meter has no response to the voltage,you can contect the red test lead to the
metal of the terminal.
Caution:
1.even if there is no indication, voltage may still exist. Do not judge the wire whether
threre is voltage absolutely throught the non contact voltage testing,the testing may be
effected by many factors such as the socket design,the insulation thickness and types
etc.
2.Interference source of external environment,such as flash,motor etc,may false
triggle the non contect voltage testing.
Ⅴ. Maintenance of meter
Warning! Switch off the power, remove the test lead and any of input
signals to prevent electric shock before opening the cover of meter or the cover of
battery.
5.1 When the meter displays the symbol of “ ”, the battery should be changed.
Open the battery cover, and then change the used battery with new battery to ensure
the normal operation of the meter.
5.2 Keep the meter and the pens clean, dry and non-destructive. Clean cloth or
detergent may be used for cleaning the cover of the meter. No grinding agent or
organic solvent can be used for the same cleaning purpose.
5.3 The meter should be protected against damage, vibration and impact. It
shouldn’t be placed where high temperature or intense magnetic field exists.
5.4 Calibrating of the meter is done on a yearly basis.
Ⅵ. Accessories
6.1 Test lead: 1 set
6.2 Users manual: 1 piece
6.3 Temperature sensors: 1 set
6.4 Cloth bag: 1piece