3 1/2 Digits Unbeatable Best Buy Multimeters with All-Ranges Protection
OPERATION MANUAL
1. SAFETY RULES
This meter is designed and tested in accordance with EN publication 61010-1, pollution
degree II and installation category (overvoltage category) II 600V.
This meter has been tested according to the following EC Directives
♦
89/336/EEC Electromagnetic Compatibility, EN61326
♦
73/23/EEC Product safety law of Low Voltage Directive, EN61010-1
This meter is designed to be indoor use at temperature 5
°
C to 40
°
C and altitude up to
2,000m.
To ensure that the meter is used safely, follow all safety and operating instructions in
this operation manual. If the meter is not used as described in this operation manual,
the safety features of this meter might be impaired.
2. INTERNATIONAL SYMBOLS
Important information
Diode
see manual
Continuity
AC
Ground
DC
Double insulation
3. SPECIFICATIONS
3.1 General Specifications
Display
: 3 1/2 digit LCD with max. reading of 1999.
Polarity
: Automatic, (-) negative polarity indication.
Zero adjustment
: Automatic.
Over range indication
: Only the MSD “1” is displayed.
Power
: 1.5V AAA battery x 3
Dimension
: 85 (W) x 155 (H) x 40 (D) mm.
Net Weight
: Approx. 250g. (Including battery).
3.2 Electrical Specifications
Accuracies are
±
(% of r number of least significant digits) at 23
°
C
±
5
°
C, <75% RH.
DC Voltage
Range
Resolution
Accuracy
Input
Impedance
Overload
Protection
200mV
0.1mV
±
(1.0%+3)
10M
Ω
600V DC/ACrms
2V
1mV
20V
0.01V
200V
0.1V
600V
1V
AC Voltage
Range
Resolution
Accuracy
Frequency
(Hz)
Overload
Protection
200V
0.1V
±
(1.2%+3d)
40~400
600V DC/ACrms
600V
1V
DC Current
Range
Resolution
Accuracy
Overload
Protection
20mA
0.01mA
±
(1.2%+3d)
250V DC/ACrms
200mA
0.1mA
10A*
0.1A
±
(5.0%+3d)
Resistance
Range
Resolution
Accuracy
Open circuit
voltage
Overload
Protection
200
Ω
0.1
Ω
±
(1.2%+3d)
<1.0V
250V DC/AC rms
<30 sec.
2k
Ω
0.001k
Ω
20k
Ω
0.01k
Ω
200k
Ω
0.1k
Ω
2M
Ω
0.001M
Ω
Capacitance
(BS1902/03)
Range
Resolution
Accuracy
Test
Volt/Freq
Overload Protection
20
µ
F
0.01
µ
F
±
(2.5% + 3d) <3V/2.5Hz
250V DC/AC rms
<30 sec
200
µ
F
0.1
µ
F
Temperature
(BS1903)
Range
Resolution
Accuracy
Overload Protection
-20
°
C to
+400
°
C
1
°
C
±
(2.5% + 4
°
C)
250V DC/AC rms <30 sec.
Diode Test
Test Voltage
Test Current
Overload Protection
<3V
Approx. 1.6mA
250V DC/AC rms
<30 sec.
Continuity
Test
Test range
Open circuit
Voltage
Overload
protection
Buzzer sounds when
resistance value
<30
Ω
<3V
250V DC/AC rms
<30 sec.
Transistor Test
(NPN-PNP)
(BS1901/02/03)
range
hFE Value
Overload
protection
hFE
0 – 1000
250V DC/AC rms
<30 sec.
Phase Sequence
Indication
Range
Phase Sequence Indication
380ACV
±
10%
Correct Phase Sequence
– Phase Sequence Light “ON”
Live Wire
Verification Voltage
Tested Voltage Range
100~250V
Battery Test
(BS 1901)
Range
Load Resistance
Overload Protection
1.5V load
150
Ω
250V DC/AC rms
<30 sec.
12V load
900
Ω
Square
Waveform Output
(BS 1901W)
Output Voltage Frequency Wave Form
Overload Protection
Approx. 3V
50Hz
Square
Wave
250V DC/AC rms
<30 sec.
* for BS1903 only, use 10A fused current adaptor at 200mV range
4. PANEL DESCRIPTIONS
1.
Live wire verification indication light
(BS1901/01W)
2.
LCD display
3.
Transistor testing socket
(BS1901/02/03); Battery test key
(BS1901W)
4.
Multifunction selector
5.
HOLD key / Battery test key
6.
Phase verification indication light
7.
Input terminal
5. OPERATION
!
WARNING
1) When measuring voltage ensure that the instrument is not connected or switched to a
current or resistance, or battery test, or diode/ continuity check range. Always ensure that
the correct terminals are used for the type of measurement to be made.
2) Use extreme care when measuring voltage above 50V, especially from sources where
high energy exists.
3) Avoid making connections to “live” circuits whenever possible.
4) When performing current measurements ensure that the circuit is not “live” before opening
it in order to connect the test leads.
5) Before performing resistance/capacitance measurements or diode test, ensure that the
circuit under test is de-energised.
6) Always ensure that the correct function and range is selected. If in doubt about the correct
range, start with the highest and work downwards.
7) Extreme care should be taken when using the instrument to conjunction with a current
transformer connected to the terminals. High voltage may be produced at the terminals if
an open circuit occurs.
8) Ensure that the test leads and prods are in good condition with no damage to the
insulation.
9) Take care not to exceed the overload limits as given in the specifications.
5.1 DC and AC voltage measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “V” terminal.
2. Set the multifunction selector to desired DC V or AC V position and connect the test leads
across the source or load under measurement.
5.2 DC current measurement
1. Connect the black test lead to the “COM” terminal and red test lead to the “mA” terminal
for measurement up to 200mA.
2. Set the multifunction selector to desired current range position.
3. Connect the test leads in series with the current source to be measured.
4. When the tested current is above 100mA, the input voltage drop might above 1V; hence,
the test duration cannot exceed 15 seconds!
!
CAUTION: Max. input overload: 250V rms < 20sec.
5.3 Resistance measurement
1.
Connect the black test lead to the “COM” terminal and red test lead to the “Ω” terminal.
2. Set the multifunction selector to desired resistance
(Ω) range position.
3. Connect the test leads across the circuit to be tested.
!
CAUTION: Ensure that the circuit to be tested is “dead”.
Max. input overload : 250V rms < 20sec.
5.4 Capacitance Measurement
(BS1902/03)
1. Connect the black test lead to the “COM” terminal and red test lead to the “
” terminal.
2. Set the multifunction selector to desired Capacitance (C) range position.
3. Connect the test leads across the capacitance to be tested.
!
CAUTION: Ensure that the capacitance to be tested is discharged.
Max. input overload : 250V rms < 20sec.
5.5 Temperature Measurement (with K-Type
Thermocouple)
(BS1903)
1. Connect the K-Type Thermocouple cathode (-) to
the “COM” terminal and the anode (+) to “
°
C”
terminal.
2. Set the multifunction selector to “
°
C” range
position.
3. Use the K-Type Thermocouple’ probe contact the
object to be tested (Liquid)
4. If the temperature of the environment is sudden
changed or the resettable fuse is in active mode,
the temperature measurement should continue
after 30 minutes; otherwise, the measurement is
not accurate.
5.6 Diode test
1. Connect the black test lead to the “COM” terminal and red test lead to the “
” terminal.
2. Set the multifunction selector to
(same as ) position.
3. Connect the black and red test leads to the cathode (-) and anode (+) ends of the diode
to be tested respectively.
4. Read the forward voltage drop (junction) value from the display. When the forward biased
is open, the display will shows overload ‘1’ .
!
CAUTION: Max. input overload: 250V rms < 20sec.
5.7
Transistor (NPN/PNP) Test
(BS1901/02/03)
1. Set the multifunction selector to hFE position, the meter will display 000
2. Connect the transistor’s pin to the testing socket according to the type of the transistor,
the meter will display transistor’s hFE value, if display abnormal value, it mean wrong
connection is made or the transistor is damage.
!
CAUTION: Max. input overload: 250V rms < 20sec.
!
