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TEST INSTRUMENT SAFETY____________________________________________________________________________
(continued from inside front cover)
4. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However,
remember that high voltage may appear at unexpected points in defective equipment.
5. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place
equipment; and make certain such surfaces are not damp or wet.
6. Use the time-proven “one hand in the pocket” technique while handling an instrument probe. Be particularly careful to
avoid contacting a nearby metal object that could provide a good ground return path.
7. When testing ac powered equipment, remember that the ac line voltage is usually present on some power input circuits such
as the on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the
equipment is turned off.
8. Some equipment with a two-wire ac power cord, including some with polarized power plugs, is the “hot chassis” type. This includes most
recent television receivers and audio equipment. A plastic or wooden cabinet insulates the chassis to protect the customer. When the
cabinet is removed for servicing, a serious shock hazard exists if the chassis is touched. Not only does this present a dangerous shock
hazard, but damage to test instruments or the equipment under test may result from connecting an earth ground lead of a test instrument to
a “hot chassis”. To make measurements in “hot chassis” equipment, always connect an isolation transformer between the ac outlet and the
equipment under test. The B+K Precision Model TR-110 or 1604 Isolation Transformer, or Model 1653 or 1655 AC Power Supply is
suitable for most applications. To be on the safe side, treat all two-wire ac powered equipment as “hot chassis” unless you are sure it has
an isolated chassis or an earth ground chassis.
9. B+K Precision products are not authorized for use in any application involving direct contact between our product and the
human body, or for use as a critical component in a life support device or system. Here, “direct contact” refers to any
connection from or to our equipment via any cabling or switching means. A ”critical component” is any component of a life
support device or system whose failure to perform can be reasonably expected to cause failure of that device or system, or
to affect its safety or effectiveness.
10. Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio-pulmonary resuscitation)
first aid is highly recommended.