SZBJ BM801A User manual

BM801A INSTRUCTION MANUAL
1. Introduction
The digital clamp meter is completely portable, 3 1/2 digits
LCD display instrument for measuring AC current, DC and
AC voltage, resistance, diode and for testing audible
continuity. It is kind of ideal facility for measurement and
monitor in electrician materials, electrical equipments and
household electric appliances etc.
2. Safety Information
This clamp meter has been designed according to
IEC61010-1
Please read this manual carefully before using the meter.
2.1 Explanation of Symbols
Warning! Important safety information is found in
the manual.
risk of high voltage and electric shock!
Double insulated.
2.2 Never exceed the protection limit values indicated in the
specifications for each range of measurement.
2.3 Check the rotary switch and make sure it is at the correct
position before measuring.
2.4 Before rotating the range selector to change functions,
disconnect test leads from the circuit under test.
2.5 Never perform resistance measurements and continuity
test on live circuits.
2.6 Exercise extreme caution when measuring live system
with voltage above 60V dc or 30V ac rms.
2.7 Keep fingers behind the barriers while measuring current.
2.8 Never touch exposed wiring, connections or live circuit
when attempting to take measurements.
2.9 Change the battery when the “ ” symbol appears to
avoid incorrect data.
3.Specification
3.1 General Specification:
3.1.1 Digital display: 3 1/2 digits LCD display with
maximum reading 1999.
3.1.2 Jaw opening capability: 52mm.
3.1.3 Data hold function: When the HOLD button is pushed,
the display will keep the last reading and “DH” symbol will
appear on the LCD until pushing it again.
3.1.4 Polarity: “-” displayed for negative polarity.
3.1.5 Over-range indication: “1” figure only on the display.
3.1.5 Low battery indication: When the battery is under the
proper operation range, “ ” will appear on the display.
3.1.6 Auto power off: If there is not any operation with the
keys or dials within about15 minutes, the meter will power
itself off to save battery consumption. Dial the rotary switch
to turn on the meter again.
3.1.7 Operating temperature and humidity: 0C~40C，
70%RH.
3.1.8 Storage temperature and humidity: -20C~60C，
80%RH.
3.1.9 Power supply: 9V battery, NEDA 1604, 6F22 or
equivalent.
3.1.10 Dimension: 248（L）88（W）45（H）mm.
3.1.11 Weight: about 360g (include battery).
3.1.12 Accessory: Test leads, Instruction Manual.
3.2 Electrical Specification:
The accuracy specification is defined as …%reading
…count.
At 235C，70%RH.
Funcuion Range Resolution Accuracy
2A 0.001A
20A 0.01A
200A 0.1A
ACA
1000A 1A
2%10
ACV 700V 1V 1.2%5
DCV 1000V 1V 0.8%2
 2k 1 1.0%2
Forward current: 1mA. Reversed voltage:
2.8V.
Buzzer sounds at less than50. Open circuit
voltage: 2.8V, Test current: 1mA.
Voltage input impeadance：10M
ACA/ACV frequence range: 50~60Hz
/ Overload protection: effective value 250V
4. Operating Instruction
4.1 Front Panel Description
(1) Transformer jaws: Pick up the AC current flowing
through the conductor.
(2) Trigger: Press the lever to open the transformer. When
the lever is released, the jaws will close again.
(3) Rotary switch: This switch is used to selected functions
and desired ranges as well as to turn on/off the meter.
(4) Data-hold button: The user may hold the present reading
and keep it on the display by pressing the “Hold” button.
When the data is no longer needed, one may release the
data-hold operation by press the “Hold” button again.
(5) LCD display
(6) “V/” jack: This is positive input terminal for volt and
ohms.
(7) “COM” jack: This is negative (ground) input terminal for
all measurement modes except current.
(8) Barrier
4.2 AC Voltage Measurement
WARNING! Maximum Input Voltage is 700V AC/DC.
Do not attempt to take any voltage measurement that may
exceed to avoid electrical shock hazard or damage to this
meter.
(1) Set the rotary switch at AC700V position. Connect the
red test lead to “V/” jack and the black test to the
“COM” jack.
(2) Connect test leads across the source or loading being
measured and read voltage value on the LCD display.

4.3 DC Voltage Measurement
WARNING! Maximum Input Voltage is 1000V AC/DC.
Do not attempt to take any voltage measurement that may
exceed to avoid electrical shock hazard or damage to this
meter.
(1) Set the rotary switch at DC1000V position. Connect the
red test lead to “V/” jack and the black test to the
“COM” jack.
(2) Connect test leads across the source or loading being
measured and read voltage value on the LCD display.
4.4 AC Current Measurement
WARNING! The input current should not exceed
indicated values, it is to avoid electrical shock hazard or
damage to this meter.
(1) Set the rotary switch at AC1000A position.
(2) Press the trigger to open transformer jaw and clamp one
conductor only, making sure that the jaw is firmly closed
around the conductor. Read current value on LCD
display.
(3) If current under test is smaller, the lower range has to be
selected.
Note: a) Disconnect the test lead with the meter for safety
before this measurement.
b) If two or more conductors are clamped, the meter
will stop operating.
c) The accurate reading will be obtained by the
conductor across center of the transformer jaws.
4.5 Resistance Measurement
WARNING! When checking in-circuit resistance, be
sure the circuit under test has all power removed and all
capacitors have been discharged fully.
(1) Set the rotary switch at 2k position.
(2) Connect the red test lead to “V/” jack and the black test
to the “COM” jack.
(3) Connect test leads across the resistor to be measured and
read LCD display.
(4) When at open circuit or over-range condition, “1” will be
displayed.
4.6 Diode Measurement
(1) Set the rotary switch at position. When the input is
not connected, i.e. at open circuit, the figure “1” will be
displayed.
(2) Connect the red test lead to “V/” jack and the black test
to the “COM” jack.(The polarity of red lead is positive
“+”)
(3) If diode test mode is selected, connect the red and black
leads to the anode and cathode of the diode, the forward
voltage drop of this diode will be displayed in mV.
(4) The figure “1” will be displayed when the diode is
reversed under test.
4.7 Continuity Test
(1) Set the rotary switch at position. When the input is
not connected, i.e. at open circuit, the figure “1” will be
displayed.
(2) Connect the red test lead to “V/” jack and the black test
to the “COM” jack.
(3) Connect tip of the test leads to the points where the
conduction needed. If the resistance is under 50, the
buzzer will sound continuously.
Note: The circuit to be tested must in power off status during
the continuity check, because any load signals may sound the
buzzer and mislead the result.
5. Maintenance
WARNING! To avoid electrical shock hazard, before
open the case or the battery cover, be sure that test leads
have been disconnected from measurement circuits. Close
case and tighten screws completely before using the meter.
5.1 If the sign “ ” appears on the LCD display, it indicates
that battery should be replaced. Remove the battery cover of
case, replace the exhausted battery with a new one.
5.2 Do not expose the instrument to direct sunlight, extreme
temperature or moisture.
5.3 Keep the meter cleaning. Do not use abrasives or
solvents on the meter, wipe periodically the case with a dry
cloth and detergent.