General Tools and Instruments GT310 - Manual (Page 7)

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!WARNING Do not measure voltages above 500V in CAT III
installations.
•
!WARNING Do not measure voltage with the rotary dial pointing
to the resistance (ohms), current, capacitance or NCVD or NCCD
positions. Never measure current with the dial pointing to the
resistance (ohms), capacitance or NCVD or NCCD positions.
• Use caution when working with voltages above 42V ACrms, or
60V DC. These voltages pose a shock hazard.
• Use the proper terminals, function, and range for all measurements.
•
!WARNING Do not operate the meter around explosive gas, vapor,
or dust.
•
!WARNING When using the probes, keep your fingers behind the
finger guards. Do not touch the metal probes of the test leads when
making a measurement.
• When making connections, connect the black (–) test lead before
connecting the red (+) test lead; when disconnecting, disconnect the
red (+) test lead before disconnecting the black (–) test lead.
• Disconnect circuit power and discharge all high-voltage capacitors
before measuring/testing resistance, continuity, diodes, or
capacitance.
• For all DC functions in both auto ranging and manual ranging modes,
to avoid the risk of shock due to possible improper reading verify the
presence of any AC voltages by first using the AC voltage
measurement function. Then select a DC voltage range equal to or
greater than the AC range.
• Before measuring current, turn off power to the circuit before
connecting the meter.
• Do not operate the meter with the case (or part of the case)
removed.
• Replace the battery as soon as the low battery indicator “ ”
appears. Operated with a weak battery, the meter might produce
false readings that could lead to electric shock and personal injury.
• Remove the test leads from the meter before opening the meter
case or battery compartment.
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