aids should also be considered. Measuring and calibration equipment may
also be susceptible.
To make a
comparison:
an arc welder when in use, would create
interference
far greater than this type of tester. It would, therefore, be reasonable to
assume that if an arc welder had been used in the area without problems,
then an AC Pinhole Detector would be safe. However, it would be unwise to
use both equipment
on the same site at the same time as they may interfere
with each other.
The test area itself should also be
considered.
For example, the layout
of the
area would affect the distances, which the emissions would travel. Buildings
and metal structures would shield against, or reduce, emissions. If the tester was
being used inside a metal tank, for example, the tank would act as a very
good shield. This would not, however, have the same effect if you were testing
a plastic tank. If you were testing the
circumference
of a metal pipe then the
pipe would act as an aerial and transmit the emissions further than expected.
Remember that electromagnetic emissions travel in all directions and can
even be bent or deflected. Neighbouring works or sites should also be
considered as there may be equipment in use that could be affected by your
tester’s emissions.
This type of tester will usually be used on outdoor sites and remote from
susceptible equipment, but the SITE SAFETY OFFICER should always be
consulted before any testing is carried out. This is particularly necessary
where electronically controlled equipment is being used.
Timing of the testing should also be considered as a means to avoiding
interference problems. Consider testing when all susceptible equipment in the
test area is switched off.
If your tester is only used in one area, then simple tests will
ascertain
where the
tester interferes with other equipment and these can be resolved by
scheduling the proper testing accordingly. Again, you should remember
neighbouring works.
The PST-100 has been designed with EMC in mind and therefore all leads are
of optimum length. If longer leads are used then they could transmit similar to
aerials and cause interference.
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