2
greater than 30V RMS, 42.4V peak, or 60VDC are present.
A good safety practice 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 connec-
tion point. In some cases, connections must be exposed to
potential human contact. Product users in these circum-
stances must be trained to protect 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.
As described in the International Electrotechnical Commis-
sion (IEC) Standard IEC 664, digital multimeter measuring
circuits (e.g., Keithley Models 175A, 199, 2000, 2001,
2002, and 2010) are Installation Category II. All other
instruments’ signal terminals are Installation Category I and
must not be connected to mains.
Do not connect switching cards directly to unlimited
power circuits. They are intended to be used with imped-
ance limited sources. NEVER connect switching cards
directly to AC mains. When connecting sources to switch-
ing cards, install protective devices to limit fault current
and voltage to the card.
Before operating an instrument, make sure the line cord is
connected to a properly grounded power receptacle.
Inspect the connecting cables, test leads, and jumpers for
possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the product, test cables,
or any other instruments while power is applied to the cir-
cuit under test. ALWAYS remove power from the entire test
system and discharge any capacitors before: connecting or
disconnecting cables or jumpers, installing or removing
switching cards, or making internal changes, such as
installing or removing jumpers.
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