|
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has been replaced by "pico".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.
|
| |
|
|
|
|
|
|
|