BST BS1901W - User 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
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 reading + 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) 10MΩ
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
(Optional)
*
0.1A
±(5.0%+3d)
Resistance
Range Resolution Accuracy
Open circuit
voltage
Overload
Protection
200Ω
0.1Ω
±(1.2%+3d)
<1.0V
250V DC/AC rms
<30 sec.
2kΩ
0.001kΩ
20kΩ
0.01kΩ
200kΩ
0.1kΩ
2MΩ
0.001MΩ
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
<30Ω
<3V
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
Square Waveform
Output
Output
Voltage
Frequency Wave Form Overload Protection
Approx. 3V 50Hz
Square
Wave
250V DC/AC rms
<30 sec.
4. PANEL DESCRIPTIONS
1. Live wire verification indication light
2. LCD display
3. Battery test key
4. Multifunction selector
5. HOLD 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 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 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.
5.5 Phase Sequence Verification
1. Connect the red test lead to the “c” terminal, black test lead to “b” terminal and yellow test
lead to “a” terminal
2. Set the multifunction selector to “600V~/abc” range.
3. Connect yellow/black/red test lead to three-phase contact point, If the phase sequence
LED lights on, indicating the connection is in correct phase sequence.
4. If the phase sequence LED lights off, please swap black (b) and red (c) test leads, if the
LED remains off which means that there is a missing phase or wrong connection, please
use Live Wire Verification function to verify each phase again.
5.6 Live Wire Verification
1. Connect the red test lead to the “
” terminal,
black test lead to “COM” terminal and hold the black
test lead (please note: do not touch the test pin
and keep your hands away from the finger guard
of the test lead!)
2. Set the multifunction selector to “600V~/abc”
range.
3. Use the red test lead to contact the live wire to
be tested. When there is a live wire, the Live Wire
Verification lights will turn on.
!

Summary

Safety, Specifications, and Panel Overview

Safety Rules and Specifications

Covers safety rules, international symbols, general and electrical specifications.

Panel Components and Basic Operations

Identifies panel parts and covers basic measurement procedures like voltage, current, resistance.

Advanced Operations, Maintenance, and Service

Advanced Operations and Maintenance

Details continuity, battery tests, waveform output, AC current, battery replacement, and cleaning.

Accessories and Service Information

Lists included accessories, warranty conditions, and service/technical contact.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

This document describes a 3 1/2 Digits Unbeatable Best Buy Multimeter with All-Ranges Protection, designed for indoor use at temperatures between 5°C and 40°C and altitudes up to 2,000m. It complies with EN publication 61010-1, pollution degree II, and installation category (overvoltage category) II 600V, as well as EC Directives 89/336/EEC (Electromagnetic Compatibility, EN61326) and 73/23/EEC (Low Voltage Directive, EN61010-1). Users must follow all safety and operating instructions to ensure safe operation and prevent impairment of safety features.

Function Description

The multimeter offers a wide range of measurement functions, including DC Voltage, AC Voltage, DC Current, Resistance, Diode Test, Continuity Test, Phase Sequence Verification, Live Wire Verification, Battery Test, and Square Waveform Output.

DC and AC Voltage Measurement: To measure DC or AC voltage, connect the black test lead to the "COM" terminal and the red test lead to the "V" terminal. Set the multifunction selector to the desired DC V or AC V position, then connect the test leads across the source or load under measurement. Extreme care should be taken when measuring voltages above 50V, especially from high-energy sources, and connections to "live" circuits should be avoided whenever possible.

DC Current Measurement: For DC current measurement, connect the black test lead to the "COM" terminal and the red test lead to the "mA" terminal for measurements up to 200mA. Set the multifunction selector to the desired current range position and connect the test leads in series with the current source. If the tested current exceeds 100mA, the input voltage drop may exceed 1V, and the test duration should not exceed 15 seconds. The maximum input overload is 250V rms for less than 20 seconds. Ensure the circuit is not "live" before opening it to connect the test leads.

Resistance Measurement: To measure resistance, connect the black test lead to the "COM" terminal and the red test lead to the "Ω" terminal. Set the multifunction selector to the desired resistance (Ω) range position and connect the test leads across the circuit to be tested. It is crucial to ensure that the circuit under test is "dead" before performing resistance measurements. The maximum input overload is 250V rms for less than 20 seconds.

Diode Test: For diode testing, connect the black test lead to the "COM" terminal and the red test lead to the "+" terminal. Set the multifunction selector to the diode test position (indicated by "++" or ")))"). Connect the black and red test leads to the cathode (-) and anode (+) ends of the diode, respectively. The forward voltage drop (junction) value will be displayed. An overload '1' will be shown if the forward-biased diode is open. The maximum input overload is 250V rms for less than 20 seconds. Ensure the circuit under test is de-energized.

Continuity Test: To perform a continuity test, connect the black test lead to the "COM" terminal and the red test lead to the ")))" terminal. Set the multifunction selector to the continuity position (indicated by ")))" or "++"). Connect the test leads across the circuit to be tested. A buzzer will activate if the resistance value is less than 30Ω. The maximum input overload is 250V rms for less than 20 seconds.

Phase Sequence Verification: For phase sequence verification, connect the red test lead to the "c" terminal, the black test lead to the "b" terminal, and the yellow test lead to the "a" terminal. Set the multifunction selector to the "600V~/abc" range. Connect the yellow/black/red test leads to the three-phase contact points. If the phase sequence LED lights on, it indicates a correct phase sequence. If the LED remains off, swap the black (b) and red (c) test leads. If it still remains off, there might be a missing phase or a wrong connection, in which case the Live Wire Verification function should be used to verify each phase again.

Live Wire Verification: To verify live wires, connect the red test lead to the "" terminal and the black test lead to the "COM" terminal. Hold the black test lead (without touching the test pin and keeping hands away from the finger guard). Set the multifunction selector to the "600V~/abc" range. Use the red test lead to contact the live wire to be tested. The Live Wire Verification light will turn on if a live wire is detected.

Battery Test: To test a battery, connect the black test lead to the "COM" terminal and the red test lead to the "batt." terminal. Set the multifunction selector to the "1.5V or 12V" range. To measure the battery voltage without loading (V1), connect the test leads to the battery (red to cathode (+), black to anode (-)). If the display shows "---", it means the red test lead is connected to the anode (-). To measure the battery voltage with loading (V2), press the "BATT." key. The meter presets an internal loading Ro of 9000 for 12V and 1500 for 1.5V. The internal impedance (Ri) of the battery can be calculated using the formula: Ri = ((V1-V2) × Ro) / V2.

Square Waveform Output: For square waveform output, connect the black test lead to the "COM" socket and the red test lead to the "ma" socket. Set the function selector to the square waveform position and connect the test leads across the device under test.

Measuring AC Current with an Add-on Clamp (Optional): Connect an add-on clamp anode (-) to the "COM" terminal and cathode (+) to the "" terminal. Clamp the tested wire with the clamp head, and the AC current value will be shown on the display.

Usage Features

The device features a 3 1/2 digit LCD with a maximum reading of 1999 and automatic negative polarity indication. Zero adjustment is automatic. An "1" on the MSD indicates an over-range condition. It is powered by three 1.5V AAA batteries. The multifunction selector allows easy switching between different measurement modes and ranges. A HOLD key is available to freeze the displayed reading. The device includes a live wire verification indication light and a phase verification indication light for enhanced safety and ease of use.

Maintenance Features

Battery Replacement: Before attempting battery removal or replacement, it is crucial to disconnect test leads or probes from any energized circuits to avoid shock hazards. To replace the battery:

1. Ensure the instrument is not connected to any external circuit. Set the multifunction selector to the OFF position and remove the test leads from the terminals.
2. Remove the screw of the battery compartment on the bottom of the back case.
3. Replace the spent battery with the same type and rating.
4. Reinstate the battery compartment, tightening the securing screw.

Cleaning: Periodically wipe the case with a soft, damp cloth and a mild household cleanser. Do not use abrasives or solvents. Ensure that no water gets inside the equipment to prevent possible shorts and damage.

Warranty and Service: The meter is guaranteed against material faults or manufacturer's defects for one year from the date of sale. Faulty parts may be replaced, with the manufacturer reserving the right to repair or replace the product. The customer is responsible for the outward transport costs when returning the meter for service. Returns must be agreed upon in advance with the consignee and should include a clear note explaining the reasons for return, using only the original packing. Damage caused by shipment without original packaging will be charged to the consignor.

The warranty does not cover accessories, batteries, repairs due to unsuitable use, incompatible accessories, incorrect shipping, unauthorized servicing, modifications without explicit authorization, or adaptations not provided for in the manual.

If the meter does not work properly, users should first check the battery condition and test leads. If the issue persists, verify that the operating procedure aligns with the manual. For technical assistance, contact the provided service channels. The manufacturer reserves the right to modify specifications and prices as part of ongoing product development.

BST BS1901W Specifications