Safety Precautions
The following safety precautions should be observed before
using this product and any associated instrumentation. Al-
though some instruments and accessories would normally be
used with non-hazardous voltages, there are situations
where hazardous conditions may be present.
This product is intended for use by qualiÞed personnel who
recognize shock hazards and are familiar with the safety pre-
cautions required to avoid possible injury. Read the operat-
ing information carefully before using the product.
Exercise extreme caution when a shock hazard is present. Le-
thal voltage may be present on cable connector jacks or test
Þxtures. 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 practice is to expect that hazardous voltage is present
in any unknown circuit before measuring.
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 circuit
under test. ALWAYS remove power from the entire test sys-
tem and discharge any capacitors before: connecting or dis-
connecting cables or jumpers, installing or removing
switching cards, or making internal changes, such as install-
ing or removing jumpers.
Do not touch any object that could provide a current path to
the common side of the circuit under test or power line
(earth) ground. Always make measurements with dry hands
while standing on a dry, insulated surface capable of with-
standing the voltage being measured.
Do not exceed the maximum signal levels of the instruments
and accessories, as deÞned in the speciÞcations and operat-
ing information, and as shown on the instrument or test Þx-
ture rear panel, or switching card.
Do not connect switching cards directly to unlimited power
circuits. They are intended to be used with impedance limit-
ed sources. NEVER connect switching cards directly to AC
main. When connecting sources to switching cards, install
protective devices to limit fault current and voltage to the
card.
When fuses are used in a product, replace with same type
and rating for continued protection against Þre hazard.
Chassis connections must only be used as shield connections
for measuring circuits, NOT as safety earth ground connec-
tions.
If you are using a test Þxture, keep the lid closed while power
is applied to the device under test. Safe operation requires the
use of a lid interlock.
If a screw is present on the test Þxture, connect it to safety
earth ground using #18 AWG or larger wire.
The symbol on an instrument or accessory indicates that
1000V or more may be present on the terminals. Refer to the
product manual for detailed operating information.
Instrumentation and accessories should not be connected to
humans.
Maintenance should be performed by qualiÞed service per-
sonnel. Before performing any maintenance, disconnect the
line cord and all test cables.
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