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CHPA SERIES
t.
Shut off the high voltage when you are making low voltage measurements. It does
not make sense to increase danger needlessly. While there may be times when you
cannot shut off the high voltage during a low voltage measurement, this is generally
not the case.
u.
Remove the test equipment when you have finished a measurement program. There
have been many instruments destroyed or damaged because a test program was
conducted in a haphazard manner, rather than in an orderly progression from start to
finish. Experience has shown in many instances when a little order would have
prevented a tragedy or avoided an expensive mistake.
v.
Be extremely wary when making filament voltage measurements. The cathode of
tubes is elevated above (or below) ground and the filament voltages usually cannot be
measured with reference to ground. Do everything you can to assure that the high
voltage cannot be turned on when you are making your measurements. This includes
disconnecting the high voltage drive source, shorting out appropriate leads, taping
down switches, and anything else you can think of to protect yourself.
w.
When troubleshooting a unit, assume that the switches and components are
defective. You may shut off the high-voltage switch in some systems, but if the switch
were defective, the high voltage would still be on. Returned units are potential booby
traps.
x.
Make sure that your workstation is stable. Flimsy work surfaces or supports for the
equipment or the test instruments represent a real threat. Do NOT use a setup that you
know is unstable and/or dangerous.
y.
Use a 1-minute rule. Wait 1 minute or more after you have shut off the equipment
before you work on a unit. Part of the reason for a 1-minute rule is that some of the
dielectrics (insulators) used for high voltage circuits can store a charge. While the
amount of charge stored is a function of the size of the object, a 1-minute rule provides
an additional margin of safety.
z.
Maintain a healthy respect for any kind of live circuit. Complacency can hurt or kill
you. Your continued wariness is your best insurance against injury or death.
Microwave Radiation
Personnel Operating Guidelines
This guideline presents operating practices appropriate for operators and technicians who work
with equipment involving microwave radiation. Keep in mind that levels of microwave radiation
that do not induce immediate physical discomfort in most individuals can be sufficiently high to
induce longer-term effects.
S-4
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