User manual

Safety measures

The Machinery-Tester MT 204-S has been built and tested in compliance

with the valid safety regulations and left the factory in safe and perfect

condition. In order to maintain this condition and to ensure safe instrument

operation, the user must pay attention to the references and warnings

contained within this instruction manual.

WARNING, DANGER OF ELECTRICAL SHOCK

• In order to avoid electrical shock, the valid safety and national

regulations regarding excessive contact voltages must receive utmost

attention when working with voltages exceeding 120V (60V) DC or 50V

(25V) RMS AC. The values in brackets are valid for limited ranges (as for

example medicine).

• The respective accident prevention regulations established by the

professional associations for electrical systems and equipment must be

strictly met at all times.

• Prior to any operation, ensure that test leads used, mains cable and

accessories are in perfect condition.

• The instrument may only be connected to mains voltage as indicated on

the type shield.

• The instrument may only be used within the operating ranges as

specified in the technical data section.

• Only touch test leads and test probes at handle surface provided. Never

directly touch test probes.

• The instrument may only be used in dry and clean environments. Dirt and

humidity reduce insulation resistance and may lead to electrical shocks, in

particular for high voltages.

• Never use the instrument in precipitation such as dew or rain. In case of

condensation due to temperature jumps, the instrument may not be

used.

• A perfect display of measurement values may only be ensured within the

temperature range of 0°C to +40°C.

• Prior to opening the instrument ensure that it is switched off and

disconnected from all current circuits.

• To ensure a safe measurement only use original test leads and

accessories.

• Dangerous voltages may be present at units under test caused by

insulation test or high-voltage test. Do not touch the units under test,

danger of electrical shock!

• Start any test series by earth bond resistance measurement.

• At insulation resistance, high-voltage and earth bond resistance

measurement, unit under test must be voltage-free. If necessary check

the unit is voltage-free i.e. by using a voltage tester.