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Only properly trained service personnel may perform
installation and service procedures.
Keithley products are designed for use with electrical
signals that are rated Installation Category I and In-
stallation Category II, as described in the International
Electrotechnical Commission (IEC) Standard IEC
60664. Most measurement, control, and data I/O sig-
nals are Installation Category I and must not be di-
rectly connected to mains voltage or to voltage sources
with high transient over-voltages. Installation Category
II connections require protection for high transient over-
voltages often associated with local AC mains con-
nections. The user should assume all measurement,
control, and data I/O connections are for connection
to Category I sources unless otherwise marked or
described in the Manual.
Exercise extreme caution when a shock hazard is
present. Lethal voltage may be present on cable con-
nector jacks or test fixtures. The American National
Standards Institute (ANSI) states that a shock hazard
exists when voltage levels greater than 30V RMS,
42.4V peak, or 60VDC are present. A good safety prac-
tice is to expect that hazardous voltage is present in
any unknown circuit before measuring.
Users of this product must be protected from electric
shock at all times. The responsible body must ensure
that users are prevented access and/or insulated from
every connection point. In some cases, connections
must be exposed to potential human contact. Product
users in these circumstances must be trained to pro-
tect themselves from the risk of electric shock. If the
circuit is capable of operating at or above 1000 volts,
no conductive part of the circuit may be exposed.
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