Metric Relationships and New International Codes

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Metric Relationships
The above chart shows the relation of term watt is a basic unit).  The number of
the most used values in the American and
the metric systems of notation.		 steps so counted is three, and the direction
was to the left.  Therefore, 5.0 milliwatts is
the equivalent of .005 watts.
This chart also serves to quickly locate
the decimal point in the conversion from
one metric expression to another.

Example: Convert 5.0 milliwatts to watts.
Place the finger on milli and count the num-
ber of steps from there to units (since the

 Example: Convert 0.00035 microfarads to
picofarads (micromicrofarads). Here the
number of steps counted will be six to the
right.  Therefore 0.00035 microfarads is the
equivalent of 350 picofarads.
New International Codes
The gradual adoption in this country of 2. “Kilomega” (km) has been replaced
new international codes for metric prefixes by “giga” (G).
amd measurement terminology by govern- “Hertz”.  This term was recently adopted
ment agencies, industry, technical maga-
zines, book publishers and others, is slowly
changing  the  system  of  measurement
and  evaluation  codes  in  general  use
today.		 in the United States but it is not represented
in this handbook.  It is, however, already
used by some publishers in place of”cycles”
in references to frequency specifications.
The old familiar terms such as “cycles”
(cyc), “kilocycles” (kc) and “megacycles”
Acceptance of the new codes here, how- (Mc), are replaced by “Hertz” (Hz),
ever, has been slow.  We have , therefore,
continued to use the more familial termi-
nology in this handbook with the following
exceptions which appear in the metric		 “kilohertz” (kHz) and “megahertz”
(MHz).
To combine two of these changes in one
tables in the next two pages: specification, the old term “kilomegacycles”
(kMc) has become “gigahertz” (GHz).
1. The cumbersome term “micromicro”
has been replaced by “pico”.  Micro-
microfarad” (µµf) now becomes “pico-
farad” (pf).		 Heinrich Rudolph Hertz, was born in
Germany in 1857 and died in 1894.  He was
the first scientist to dect, create and
measure electromagnetic waves.

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