Page 3 PRC50-EN-V2.1 11/11
3 Safety Information
For the correct and safe use of the instrument, be sure to follow the cautionary notes stated in this manual whenever
handling the instrument. Extech Instruments shall not be held liable for any damage resulting from use of the instrument in a
manner other than prescribed in the cautionary notes.
A
Warning
identifies conditions and actions that pose hazards to the user; a
Caution
identifies conditions and actions that
may damage the meter or the equipment under test.
Refer to Table 1 for the international electric symbols adopted by the calibrator.
Table 1 - International Electrical Symbols
EARTH GROUND
WARNING
INFORMATION
Warning
To avoid possible electric shock or personal injury:
z
Do not apply more than the rated voltage, as marked on the calibrator, between terminals or between any terminal and
earth ground;
z
Before use, verify the meter’s operation by measuring a known voltage;
z
Follow all equipment safety procedures;
z
Do not connect the probe of the test leads with any live power when the other end has been inserted into the current
jack;
z
Do not use the meter if it is damaged. Before using the meter, inspect the case. Look for cracks or missing plastic. Pay
particular attention to the insulation surrounding the connectors;
z
Select the proper function and range for the measurement;
z
Make sure the battery door is closed and latched before operating the meter;
z
Remove test leads from the meter before opening the battery door;
z
Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace damaged test leads
before using the meter;
z
When using the probes, keep fingers behind the finger guards on the probes;
z
Connect the common test lead before connecting the live test lead. When disconnecting test leads, disconnect the live
test lead first;
z
Do not use the meter if it operates abnormally. Protection may be impaired. When in doubt, have the meter inspected;
z
Do not operate this instrument in areas where inflammable or explosive gases or vapor exists. It is extremely hazardous
to use the instrument under such environments;
z
Do not operate the meter near explosive gas, vapor, or dust;
z
Use only four (4) AAA 1.5V batteries, properly installed in the meter case, to power the meter;
z
Disconnect the test leads before changing source or measurement functions;
z
When servicing the meter, use only specified replacement parts.
z
To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as
the low battery indicator (
) appears.
