Simpson 270 Series - Page 28

Operation
4.2.1 The 270 should only be used by personnel qualified to
recognize shock hazards and trained in the safety precautions re-
quired to avoid possible injury.
4.2.2 Do not connect any terminal of this Instrument to a circuit
point at which a voltage exceeding 1000 volts AC or DC may
exist with respect to earth ground. (Refer to Table 1-1, item 16.)
4.2.3 Turn off power and discharge any capacitors in the circuit
to be measured before connecting to or disconnecting from it.
4.2.4 Prior to using this Instrument, check accessories (if any)
and test leads for missing, damaged, deteriorated or otherwise
faulty insulating parts. Do not use, or permit the use of equip-
ment with faulty insulation until it has been properly repaired.
NOTE: e Always wear safety glasses when working in
clectrical circuitry.
е Do not work alone on high voltage circuits.
Make certain that someone capable of ren-
dering aid is nearby and watchful.
e Do not handle the instrument, its test leads,
or the circuitry while high voltage is being
applied.
4.2.5 Hands, shoes, floor, and workbench must be dry. Avoid
making measurements under humid, damp, or other environmental
conditions that could affect the dielectric withstanding voltage of
the test leads or Instrument.
4.2.6 Do not change switch settings or test lead connections
while the circuit is energized. A mistake could result in damage
to the instrument and possible personal injury.
4.2.7 Locate all voltage sources and accessible current paths
before making connections to circuitry.
4-2