BST BS1801 Operation Manual

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
!
see manual
AC
DC

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 reading + number of least significant digits) at 23°C ± 5°C, <75% RH.
Range Resolution
200mV 0.1mV
DC Voltage 2V 1mV
20V 0.01V
200V 0.1V
600V 1V
Range Resolution
AC Voltage
200V 0.1V
600V 1V
Range Resolution
20mA 0.01mA
DC Current
200mA 0.1mA
10A* 0.1A
Range Resolution
200Ω 0.1Ω
2kΩ 0.001kΩ
Resistance
20kΩ 0.01kΩ
200kΩ 0.1kΩ
2MΩ 0.001MΩ
Range Resolution
Capacitance
20µF 0.01µF
(BS1902/03)
200µF 0.1µF
Range Resolution
Temperature
-20°C to
(BS1903) 1°C
+400°C
Test Voltage
Diode Test
<3V
Test range
Continuity
Buzzer sounds when
Test
resistance value
<30Ω
range
Transistor Test
(NPN-PNP)
hFE
(BS1901/02/03)
Range
Phase Sequence
Indication ±
380ACV 10%
Live Wire
Verification Voltage
Range
Battery Test
1.5V load
(BS 1901)
12V load
Output Voltage
Square
Waveform Output
Approx. 3V
(BS 1901W)
* for BS1903 only, use 10A fused current adaptor at 200mV range
Diode
Continuity
Ground
Double insulation
Input
Accuracy
Impedance
600V DC/ACrms
±(1.0%+3) 10MΩ
Frequency
Accuracy
(Hz)
40~400 600V DC/ACrms
±(1.2%+3d)
Overload
Accuracy
Protection
±(1.2%+3d)
250V DC/ACrms
±(5.0%+3d)
Open circuit
Accuracy
voltage
250V DC/AC rms
±(1.2%+3d) <1.0V
Test
Accuracy Overload Protection
Volt/Freq
250V DC/AC rms
±(2.5% + 3d) <3V/2.5Hz
Accuracy Overload Protection
±(2.5% + 4°C) 250V DC/AC rms <30 sec.
Test Current Overload Protection
250V DC/AC rms
Approx. 1.6mA
Open circuit
Voltage
250V DC/AC rms
<3V
hFE Value
250V DC/AC rms
0 – 1000
Phase Sequence Indication
Correct Phase Sequence
– Phase Sequence Light "ON"
Tested Voltage Range
100~250V
Load Resistance Overload Protection
150Ω
250V DC/AC rms
<30 sec.
900Ω
Frequency Wave Form Overload Protection
Square 250V DC/AC rms
50Hz
Wave <30 sec.

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.
Overload
Protection
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
Overload
1. Connect the black test lead to the "COM" terminal and red test lead to the "mA" terminal
Protection
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
Overload
1. Connect the black test lead to the "COM" terminal and red test lead to the "Ω" terminal.
Protection
2. Set the multifunction selector to desired resistance (Ω) range position.
3. Connect the test leads across the circuit to be tested.
!
CAUTION:
<30 sec.
5.4 Capacitance Measurement (BS1902/03)
1. Connect the black test lead to the "COM" terminal and red test lead to the "
2. Set the multifunction selector to desired Capacitance (C) range position.
3. Connect the test leads across the capacitance to be tested.
!
CAUTION:
<30 sec
5.5 Temperature
Thermocouple) (BS1903)
1. Connect the K-Type Thermocouple cathode (-) to
the "COM" terminal and the anode (+) to "°C"
<30 sec.
terminal.
Overload
2. Set the multifunction selector to "°C" range
protection
position.
3. Use the K-Type Thermocouple' probe contact the
object to be tested (Liquid)
<30 sec.
4. If the temperature of the environment is sudden
Overload
changed or the resettable fuse is in active mode,
protection
the temperature measurement should continue
after 30 minutes; otherwise, the measurement is
<30 sec.
not accurate.
5.6 Diode test
1. Connect the black test lead to the "COM" terminal and red test lead to the "
2. Set the multifunction selector to
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.
Ensure that the circuit to be tested is "dead".
Max. input overload : 250V rms < 20sec.
Ensure that the capacitance to be tested is discharged.
Max. input overload : 250V rms < 20sec.
Measurement (with K-Type
(same as ) position.
" terminal.
" terminal.