Simpson 460 4 Series - Page 27

Operation
4.2.5 Measurements in a circuit should not be made where a
corona is present. Corona can be identified by a pale-blue color
emanating from sharp metal points in the circuit or a buzzing
sound, or the odor of ozone. In rare instances, such as around
germicidal lamps, ozone might be generated as a normal func-
tion. Ordinarily, the presence of ozone indicates the presence of
high voltage and probably a malfunction of some kind.
4.2.6 Hands, shoes, floor and workbench must be dry. Avoid
making measurements under humid, damp, or other environ-
mental conditions that could affect the dielectric withstanding
voltage of the test leads or the Instrument.
4.2.7 Do not touch test leads, circuit, or Instrument while power
is applied to the circuit being measured.
4.2.8 Use extreme caution when making measurements in a
circuit where dangerous composite voltages could be present, such
as in an r-f amplifier.
4.2.9 Do not use test leads which differ from those originally
furnished with the Instrument.
4.2.10 Before the Instrument is used for AC operation, make sure
that the "third wire" on the AC power cord is connected to an
earth or powerline ground.
4.2.11 Do not float any measuring terminal more than the rated
circuit to ground voltage as specified in Table 1-1, item 6.
4.3 PRELIMINARY NOTES AND CHECKS
NOTE: Prior to the operation of the Instrument, review
and perform (where applicable) the following notes and
checks. These steps can be used also as a general func-
tional check.
4-2