Clas Ohlson BS1801 User Manual

Digital Multimeter
• Digital Multimeter BS1801 with 3½ - digit display.
• Automatic shutdown
• Comes with test probes and 9V battery, type 6F22.
1. Warning!
The instrument is meant for indoor use at temperatures 5ºC - 40ºC at a height up
to 2000 m above sea level.
Follow all instructions for safety and use in the instruction manual.
• Carefully read the following before you start to use the meter.
• Avoid damage to the meter by not exceeding maximum input values for the
measuring data.
• Do not use the meter or test cables if they look like they are damaged. Be
very careful when you work close to uninsulated cable.
• Accidental contact with electric cables can give electric shocks.
• Only use the meter the way described in this instruction manual.
• Read the entire instruction manual before use. Follow all safety instructions.
• Be careful when working with voltages greater then 20 V DC they can give
electric shocks.
• Remember to disconnect the circuit from the mains and all loads from the
circuit before measuring resistance and continuity testing.
• Never use the meter if it is damaged or does not work correctly.

2. Safety symbols

! Read the manual before use
AC current
DC current
Measuring diodes
Continuity test
Earth
The meter is protected by double insulation
Conforms to CE norms
The instrument is constructed and tested according to the EN publication norms:
61010-1, environmental class II and installation category III 600 V.
The instrument is tested according to the following EC directive:
• 89/336/EEC Electromagnetic Compatibility, EN61326
• 73/23/EEC Product safety law of Low Voltage Directive, EN61010-1

3. Functions

• 3 ½ digit LCD display with max. reading 1999
• 600 V AC/DC voltage range
• 30 MΩ resistance range
• Continuity test with buzzer
• Automatic polarity indication
• Memory for current or max. value
• Automatic zeroing
• Automatic shutdown after 15 minutes inactivity
• Overvoltage warning: Only the digit "1" is displayed
3.1 This box contains
• 2 x test leads
• Instruction manual
• Multimeter
• 9 V battery
• Test protocol
GREAT BRITAIN For consumer contact, please visit www.clasohlson.co.uk and click on customer service.
Article number: 36-1743 • Model: BS1801

4. Electrical Specifications

Accuracy is ± (% of reading + amount of the least significant number) at 23 °C ±
5 °C, < 75% RH.
DC V
Measurement Resolution Accuracy Input Overload Protection
Range Impedance
200 mV 0.1 mV ± (0,8% +1) 10 MΩ 600V DC/AC rms
2 V 1 mV ± (0,8% +1) 10 MΩ 600V DC/AC rms
20 V 10 mV ± (0,8% +1) 10 MΩ 600V DC/AC rms
200 V 100 mV ± (0,8% +1) 10 MΩ 600V DC/AC rms
600 V 1 V ± (1.0% +1) 10 MΩ 600V DC/AC rms
ACV
Measurement Resolution Accuracy Input Overload
Range Impedance Protection
200 V 100 mV ± (1,5% +10) 10 MΩ 600V DC/AC rms 40 – 400Hz
600 V 1 V ± (1,5% +10) 10 MΩ 600V DC/AC rms 40 – 400Hz
DC A
Measurement Resolution Accuracy Voltage Overload Protection
Range drop
200 mA 0.1 mA ± (1,0% +3) 100 mV Fuses: 200 mA/250 V (quick)
10 A 100 mA ± (2,0% +5) 100 mV Fuses: 10 A/250 V (quick)
Resistance Ω
Measurement Resolution Accuracy Idling Overload Protection
Range voltage
200 Ω 0,1 Ω ± (1.0% +5) ≤ 0.7 V 250V DC/AC rms (< 10 s)
2 kΩ 1 Ω ± (1.0% +5) ≤ 0.7 V 250V DC/AC rms (< 10 s)
20 kΩ 0.01 kΩ ± (1.0% +5) ≤ 0.7 V 250V DC/AC rms (< 10 s)
200 kΩ 0.1 kΩ ± (1.0% +5) ≤ 0.7 V 250V DC/AC rms (< 10 s)
20 MΩ 0.01 MΩ ± (1.5% +3) ≤ 0.7 V 250V DC/AC rms (< 10 s)

Diode Test

Measurement Test Test current Idling Overload Protection
Range voltage voltage
0-1999 mV 1.0±0.6 mA Approx. 250V DC/AC rms (< 10 s)
2.8 V

Continuity Test

Measurement Test range Test current Idling Overload Protection
Range voltage
< 50±30Ω* 1.0 mA Approx. 250V DC/AC rms (< 10 s)
2.8 V
* buzzer sounds at < 50±30Ω
Battery Test
Measurement Test current Overload Protection
Range
1.5 V 40 mA at 37Ω Fuses: 200mA/250V (quick)
9V mA 24 mA at 361Ω Fuses: 10A/250V (quick)
4.1 Specifications
Display: 3 ½ digit LCD display with max. reading 1999.
Indication of polarity: Automatic, the display shows "-" for negative polarity.
Zeroing: Automatic
Indication that the value is outside the measurement range:
The display will show "1".
Power Supply: 1 x 9 V battery (6LR61)
Automatic shutdown: 15 minuter
Size in mm: 150 x 80 x 40 (h x b x d)
Weight: Approx. 300 grams with battery

5. Description

1. 3½ digit display
2. [RES] Reset button
3. [HOLD] Memory button
4. Function selector
5. Test probe connection

6. Use

If the display does not change while measuring you should check that the Data
Hold is not activated ("H" is shown on the display when Hold is activated)

6.1 Measuring DC Voltage (VDC) and AC Voltage (VAC)

1. Connect the black test lead to the "COM" jack and the red test lead to the
Frequency
"V/Ω" jack.
2. Set the function selector to DCV or ACV and connect the test probes to the circuit.
3. Read the value, press [HOLD] if you have difficulty seeing the display or if you
wish to save the reading.

6.2 Measuring DC Current (DCA)

1. Connect the black test lead to the "COM" jack and the red test lead to the
"mA" jack (for measurements up to 200 mA).
2. Set the function selector to "200m" and connect the test probes to the circuit.
3. Read the value; press [HOLD] if you have difficulty seeing the display or if you
wish to save the reading.
4. Measuring current strengths from 200mA to 10A (fused) is done in the same
way but the red test lead is connected to "10A".
Warning! Maximum overload: 250V DC/AC rms (< 10 s).
6.3 Measuring Resistance (Ω)
1. Check that the circuit is not carrying any current and discharge all capacitors
before measuring.
2. Set the selector switch to the desired measuring range (200Ω - 20MΩ)
3. Connect the black test lead to the "COM" jack and the red test lead to the
"V/Ω" jack.
4. Connect the probes to the circuit and read displayed value.
5. Read the value; press [HOLD] if you have difficulty seeing the display or if you
wish to save the reading.
Warning! Maximum overload: 250V DC/AC rms (< 10 s).
6.4 Diode Test
1. Connect the black test lead to the "COM" jack and the red test lead to the
"V/Ω" jack.
2. Set the selector switch to .
3. Connect the black test probe to the cathode (-) and the red test probe to the
anode (+) on the diode and read the displayed value.
4. Read the voltage drop across the diode (if the test leads have been
connected incorrectly "1" appears in the display).
6.5 Continuity Test
1. Set the selector switch to .
2. Connect the black test lead to the "COM" jack and the red test lead to the
"V/Ω" jack.
3. Connect the test probes to the circuit.
4. If the resistance is less than 50±30Ω the buzzer will activate!
6.6 Battery Test
1. Set the selector switch to 1.5V or 9V depending on which battery is to be
tested 1.5V (for R69) or 9V (for 6LR61).
2. Connect the black test lead to the "COM" jack and the red test lead to the
"mA" jack.
3. Connect the test probes to the battery (red to + and black to -).
4. The capacity of the battery is displayed (a good value for R6 batteries is 40mA
and for 6LR61 batteries is 24mA).
6.7 Switching the multimeter off
• Turn the selector switch to "OFF".
• Automatic shutdown after 15 minutes inactivity. Push [RES] to turn on the
instrument after automatic shutdown.
6.8 Memory
Current reading memory allows you to save readings. Push [HOLD] to save the reading,
push [HOLD] once more to erase the memory and take a new measurement.

7. Battery change

Warning: Always remove the
test cables from the circuit before
changing batteries.
1. Check that the instrument is not
connected to any test object.
Remove the test cables and set
the function selector to "OFF".
2. Remove the screw that holds
the battery cover on the back of
the instrument.
3. Remove the old battery and insert a new one as marked in the battery compartment.
4. Put the battery cover back and tighten the screw. Note! Do not tighten too
hard, the housing can be damaged.

8. Replacing the fuses

Warning: Always remove the
test cables from the circuit before
changing batteries. Always replace
fuses with identical ones.
1. Check that the instrument
is not connected to any test
object. Remove the test
cables and set the function
selector to "OFF".
2. Remove the four screws
securing the back panel of
the instrument.
3. Remove the battery and take off the back.
4. You will see a fuse, it is a 200mA fuse (5 x 20 mm, quick)
5. The 10A fuse is located on the circuit board under the 200mA fuse, unscrew
the nine small screws to get at it.
6. Put the battery cover back and tighten the screws. Note! Do not tighten too
much!
Note! Check that the function selector is on "OFF" before replacing the circuit
board.
9. Cleaning
• Wipe off with a damp cloth when needed
• Only use mild detergents, never solvents or strong detergents.
Warning! Avoid exposing the instrument to electric shocks, knocks and water.
10. Disposal
• Electrical waste products must not be thrown away with household waste.
• Follow local ordinances when disposing of this product. If you are unsure
about how to dispose of this product contact your municipality.