Operation Page 27 of 85
Section 2: Operation
2.1 Terms and Conventions
Table 2-1: Measurement Unit Prefixes
Multiple Scientific Engineering Symbol
1000000000000000 10
15
Peta P
1000000000000 10
12
Tera T
1000000000 10
9
Giga G
1000000 10
6
Mega M
1000 10
3
Kilo k
.001 10
-3
milli m
.000001 10
-6
micro u
.000000001 10
-9
nano n
.000000000001 10
-12
pico p
.000000000000001 10
-15
femto f
ARCing: Sparking or ‘flashing over’ caused by a breakdown of electrical
insulation.
Current:
AC: Alternating Current. AC is an electrical current that has one
polarity during part of the cycle and the opposing polarity during
the other part of the cycle. Residential electricity is AC.
DC: Direct Current. Non-reversing polarity. The movement of charge
is in one direction. Used to describe both current and voltage.
Batteries supply direct current (DC).
Charging Current: An insulated product exhibits the basic characteristics of a
capacitor. Application of a voltage across the insulation causes a
current to flow as the capacitor charges. This current
instantaneously rises to a high value as voltage is applied then
exponentially decays to zero as the DUT becomes fully charged.
Charging current decays to zero much faster than dielectric
absorption.
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