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GB | Digital Multimeter
Carefully read through this instruction manual before you begin using the MD-310. It contains particularly
important passages concerning occupational safety principles when using the device. Such passages
are highlighted. Reading the manual will prevent potential injury by electric current or damage to the
device. The multimeter was designed in accordance with the IEC-61010 standard regarding electronic
measuring devices in the category (CAT III 300 V), 2nd degree of pollution. The CAT III category is used to
measure circuits powered by a xed output power supply, such as a relay, socket, switchboards, power
supplies, short branching circuits and lighting systems in large buildings.
Warning
Use the MD-310 multimeter only in the manner specied below. Other uses may cause damage to the
device or injury to your health. Comply with the following instructions:
• Before measuring resistance, diodes or current, disconnect the circuits from the power supply and
discharge the high-voltage capacitors. Use the corresponding function for the given measurement.
Before changing the range (or switching functions) disconnect the conductor from the circuit that
is being measured.
• Make sure the device is not damaged before you begin using the multimeter. If you nd obvious
signs of damage on the body of the device, do not make any measurements! Check that the surface
of the multimeter does not have scratches and that the side joints are not coming apart.
• Also check the insulation on the measuring probes. Damaged insulation may result in injury by
electric current. Do not use damaged measuring probes!
• Do not measure voltages above 300 V! If you intend to measure current, check the multimeter's fuse
and turn o the power supply to the circuit before you connect the multimeter. Before measuring,
make sure the circular switch for the measuring range is in the correct position. Under no circum-
stances should you make any changes to the measuring range (by moving the circular switch for
measuring programs) while measuring! It could damage the device. When you are measuring, rst
