Tektronix TDS3012C User Manual page 11

Important safety information
Ground the product. This product is grounded through the grounding
conductor of the power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground. Before making
connections to the input or output terminals of the product, make sure
that the product is properly grounded.
Do not disable the power cord grounding connection.
Power disconnect. The power cord disconnects the product from the
power source. See instructions for the location. Do not position the
equipment so that it is difficult to operate the power cord; it must remain
accessible to the user at all times to allow for quick disconnection if
needed.
Connect and disconnect properly. Do not connect or disconnect probes
or test leads while they are connected to a voltage source.
Use only insulated voltage probes, test leads, and adapters supplied with
the product, or indicated by Tektronix to be suitable for the product.
Observe all terminal ratings. To avoid fire or shock hazard, observe all
ratings and markings on the product. Consult the product manual for
further ratings information before making connections to the product.
Do not exceed the Measurement Category (CAT) rating and voltage or
current rating of the lowest rated individual component of a product,
probe, or accessory. Use caution when using 1:1 test leads because the
probe tip voltage is directly transmitted to the product.
Do not apply a potential to any terminal, including the common
terminal, that exceeds the maximum rating of that terminal.
Do not float the common terminal above the rated voltage for that
terminal.
The measuring terminals on this product are not rated for connection
to mains Category III or IV circuits, or to mains Category II circuits
greater than 100 V.
When connected to circuits other than mains, the maximum transient
overvoltage rating is 400 V peak."
Do not operate without covers. Do not operate this product with covers
or panels removed, or with the case open. Hazardous voltage exposure
is possible.
TDS3000C Series Oscilloscope User Manual v