2
3
Digital multimeter EM320A
Before you start using EM320A read carefully this manual.
Especially important passages that deal with principles of safety work with this device are highlighted. You will prevent
electric shock or damage of the device. The digital multimeter was designed in accordance with standard IEC-61010
relating to electronic measuring instruments falling in to the category (CAT II 250V), safety class II and pollution level 2.
Electrical symbols
Alternating current (AC)
Direct current (DC)
Alternating/direct current (AC/DC)
WARNING - Read up the instructions before using this device
Risk of electric shock
Ground
Safety-fuse
Declaration of Conformity (CE)
The device is protected by a double insulation and a reinforced insulation
CAUTION
Pay special attention to the following instructions:
• Carefully check that the device is not damaged before you start using the multimeter. If you see any obvious damage
of the device, do not perform any measurement! Check if the surface of the multimeter is not scratched and side
connections are not unglued.
• Check the insulation of the measuring probes and jaws. There is a risk of electric shock when the insulation is damaged.
Do not use the damaged probes!
• Do not measure voltages higher than 250 V or current higher than 200 mA!
• Do not measure current, if the void voltage in an open circuit is higher than 250 V.
• The „COM“ terminal must always be connected to the reference measuring ground.
• If you detect abnormal measurement results, do not use the multimeter. If you are not sure about the cause of a
failure, contact the service center.
• Do not measure higher voltages and currents than those indicated on the front panel of the multimeter. There is a
risk of electric shock and damage of the multimeter!
• Verify that the multimeter is working properly before use. Test a circuit where you know its electrical parameters.
• Turn off the power supply of the circuit before you connect the multimeter to the circuit of which current you intend
to measure to.
• Do not use or store the multimeter in environments with high temperature, dust and moisture. It is also not rec-
ommended to use the device in an environment where a strong magnetic field is present or where there is a risk of
explosion or a fire.
• When replacing the battery or other parts of the multimeter, use spare parts of the same type and specification.
Replace the parts only when the multimeter is switched off and disconnected!
• Do not change or modify the internal circuits of the multimeter!
• Caution when measuring voltages higher than 30 V AC rms, 42 V peak or 60 V DC. Risk of electric shock!
• When handling the measuring pins make sure to hold them behind the finger barrier.
• To avoid electric shock, do not touch any bare wires with your hands or skin.
• Disconnect the measuring pins from the circuit before opening the cover of the multimeter.
• Do not take any measurements if the cover of the multimeter is removed or it is loose.
• When the display shows a discharged battery icon „
“, replace the battery. Otherwise, the subsequently
performed measurements can be inaccurate. This can lead to biased results of the measurement resulting in an
electric shock!
CAT II - Measurement Category II is intended for measurements performed on circuits connected directly to low voltage
equipment for example measurements on household appliances, portable tools and similar equipment. Do not use the
multimeter for measuring ranges falling in to the categories III and IV!
WARNING
Use a multimeter EM320A only as specified below, otherwise it may result in damage of the device or your health. Pay
attention to the following instructions:
• Disconnect circuits from their power source and discharge high-voltage capacitors, before you make any measurement
of resistance, diode or current.
• Check if a round range selector switch knob is in the correct position before measurement. Do not make any changes
in the measuring range (by turning the round range selector switch knob) during the measurement in any case! This
could cause damage of the device.
• When measuring current, turn off the power supply of circuit before you connect the multimeter.
Description of the device
Digital multimeter EM320A belongs to a series of compact devices with 3.5 digital display, designed to measure AC and
DC voltage, DC current, resistance and diode testing. It indicates exceeding of the measured range. It has an auto power
off feature. The multimeter offers an overload protection and information about low battery. Ideal use of the multimeter
EM320A is for example in workshops, laboratories and homes.
Technical specifications
Display:
LCD, 1999 (3.5 digits) with an automatic polarity indication
Working temperature:
0 °C to 40 °C <75%
Storage temperature:
-10 °C to 50 °C, relative humidity <85%
Power:
1× 12V (23A)
Low battery:
indication by battery symbol on the display
Over range indication:
display number “1” on the LCD
Measurement category:
CAT II (250 V)
Dimensions and weight:
57 × 95 × 30 mm, 82 g (including battery)
Front view of the multimeter
1. Display - 3.5 digit LCD display with maximum indication up to 1999
2. Rotary switch knob
It is used for the desired function selection and also for turning the measuring device on and off. Set the rotary switch
knob to the OFF position, when you are not using the device.
3. Test conductors
Measurement accuracy
Accuracy is specified for a period of one year after calibration, at 18 °C to 28 °C and at a relative humidity of 75%.
Accuracy specification has the following form:
± ([% of device reading] + [number of the lowest valid digits])
