1.1.1 Safety instructions
1.1 Safety information
• Before operating this meter, please observe the standard safety procedures in two aspects:
A. Safety measures to protect against electric shock
B. Safety measures to protect against unintended use
• To ensure your personal safety, please use the test leads enclosed with the meter. Before operating the meter, ensure
that the test leads are flawless.
1.1.2 Safety aspects
Digital multimeter
GB
19
• If the meter is used in the vicinity of equipment generating strong electromagnetic interferences, the reading on
the meter will become unstable and might lead to serious mistakes.
• Do not operate the meter or test leads if they appear to be damaged.
• If the meter is not operated properly, safety cannot be sufficiently guaranteed.
• The meter must be operated with great care when working in the vicinity of an exposed conductor or bus line.
• It is prohibited to use the meter in the vicinity of explosive gases, vapours or dust.
• Measurements must only be taken after the measuring range has been set correctly.
• To prevent the meter from being damaged, the input values must not exceed the maximum values of the respective
measuring range.
• If the meter has already been connected to the line being measured, the operator is prohibited from touching the
input terminals that are not in service.
• If the voltage measured exceeds 60 V dc or 30 V ac (valid value), the operator has to be very careful. Under
unfavourable conditions, these voltages can lead to a life-threatening electric shock.
• Always place your fingers behind the touch protection when working with the test leads.
• When switching to another measuring range, make sure that the test leads have already been taken off the measured
circuit.
• For all DC functions, to prevent potential electric shock as a result of incorrect reading, please use AC functions first
to check the absence of any AV voltage. Only then, select the DC voltage measuring range equivalent to or greater
than that for AC voltage.
• Before measuring resistances, diodes, capacitors or continuity, the operator has to cut off the power supply to the
circuit to be measured and discharge all high-voltage capacitors within the circuit to be measured.
• The electric resistance measurement or continuity test cannot be carried out in any live electrical circuit.
• Before measuring the current, the insulation of the measuring tips has to be checked for potential damage first.
Before connecting the meter to the circuit to be measured, you have to power off the aforesaid circuit.
• When repairing TV sets or measuring power circuits, the operator has to avoid high voltage pulses to prevent the
meter from being damaged.
• This meter uses 4 x 1.5 AA batteries. They have to be inserted into the battery compartment correctly.
• When appears, the batteries must be replaced immediately. A low battery level will result in incorrect
readings on the meter, which is likely to cause personal injury or electric shock.
• In measurements, overvoltage categories III and IV must not exceed 1,000 V or 600 V respectively.
• The meter must not be used if its case or part of its case is dismantled.