Major tech MT478 Manual do utilizador - Página 6

Procurar online ou descarregar pdf Manual do utilizador para Equipamento de teste Major tech MT478. Major tech MT478 16 páginas. Voltage tester

1. Safety

1.4 The safely can no longer be insured if the instrument:

• Shows obvious damage

• does not carry out the desired measurements

• has been stored for too long under unfavorable conditions

• has been subjected lo mechanical stress during transport.

All relevant statutory regulations must be adhered to when using this

instrument

1.5 Safety Advices

• Depending on the internal impedance of the voltage detector there will

be a diﬀerent capability of indicating the presence or absence of

operating voltage in case of the presence of interference voltage.

• A voltage detector of relatively low internal impedance, compared to the

reference value of 100kΩ, will not indicate all interference voltages

having an original voltage value above the ELV level. When in contact

with the parts to be tested, the voltage detector may discharge

temporarily the interference voltage lo a level below the ELV, but it will

be back to the original value when the voltage detector is removed.

• When the indication "voltage present" does not appear, it is highly

recommended installing earthing equipment before work.

• A voltage detector of relatively high internal impedance, compared lo !he

reference value of 100kΩ, may not permit to clearly indicate the

absence of operating voltage in case of presence of interference

voltage.

• When the indication "voltage present" appears on a part that is expected

to be disconnected of the installation, it is highly recommended

conﬁrming by another means (e.g. use of an adequate voltage detector,

visual check of the disconnecting point of the electric circuit, etc.) that

there is no operating voltage on the part to be tested and to conclude

that the voltage indicated by the voltage detector is an interference

voltage.

• A voltage detector declaring two values of internal impedance has

passed a performance test of managing interference voltages and is

(within technical limits) able to distinguish operating voltage from

interference voltage and has a means to directly or indirectly indicate

which type of voltage is present