SZBJ BM87 User manual

BM87 ENGLISH 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 equipment and household electric appliances
etc.
2. Safety Information
This clamp meter has been designed according to
IEC1010 and UL3111-1.
Please read this manual carefully before using the meter.
2.1 Explanation of Symbols
Warning! Important safety information is found in
the manual.
Caution: dangerous voltage, risk of electric shock.
Double insulation (protection class II)
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: 30mm.
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 Operating temperature and humidity: 0C~40C，
70%RH.
3.1.7 Storage temperature and humidity: -10C~60C，
80%RH.
3.1.8 Power supply: 1.5V batteries size 7(AAA)*2
3.1.9 External dimensions: 165（L）×68（W）×28（H）
mm
3.1.10 Weight: About 170g (including battery’s
weight)
3.2 Electrical Specification:
The accuracy specification is defined as …%reading
…count.
At 235C，70%RH.
Function Range Resolution Accuracy Overload
protection
2000mA 1mA 40A
20A 0.01A 40A
200A 0.1A 800A
ACA
600A 1A
2%10
800A
ACV 600V 1V 1.2%5 600V
DCV 600V 1V 0.8%5 600V
 2000 1 1.0%5 250V
Forward current: 0.8A. Reversed voltage:
2.6V.
250V
Buzzer sounds at less than50. Open
circuit voltage: 2.6V, Test current: 1mA.
250V
DCV/ACV input impedance :10M Frequency
Range : 50~60Hz
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.
4.2 AC Voltage Measurement
WARNING! Maximum Input Voltage is 600V 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 AC600V 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 600V 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 DC600V 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 AC600A 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 2000 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.
Ⅴ. Maintenance of meter
Warning! Switch off the power, the meter
pens 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 two new 1.5V
batteries size 7(AAA) 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 A pair of test leads
6.2 One instruction manual