HT Instruments HT6 Bedienungsanleitung Seite 21

1. PRECAUTIONS AND SAFETY MEASURES
• 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 100k, 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 to 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 to the
reference value of 100k, 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
Before and after carrying out the measurements, carefully observe the following
instructions:
• Do not carry out any voltage measurement in humid environments.
• Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
• Avoid any contact with the circuit being measured if no measurements are being
carried out.
• Avoid any contact with exposed metal parts, with unused measuring probes, etc.
• Do not carry out any measurement in case you find anomalies in the instrument such
as deformation, breaks, substance leaks, etc.
• Do not carry out any measurement in case of rain or bad weather.
• Do not carry out any measurement with open battery compartment.
• Pay special attention when measuring voltages higher than 20V, since a risk of
electrical shock exists
In this manual, and/or on the instrument, the following symbols are used:
Warning: observe the instructions given in this manual; improper use could
damage the instrument or its components.
High voltage danger: electrical shock hazard.
Double-insulated meter.
SAFETY ADVICES
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EN - 2
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