"Mark D. Zacharias" wrote in message
...

Not to be picky, Mark, but it is MHz and KHz. A mHz is .000001 Hz
(277.778 hours per cycle) and a kHz is .001 Hz (16.667 seconds per
cycle).

A correction to a correction...

Many years ago, it was KHz. When the decision was made that unit
abbreviations would be capitalized only when they were derived from names
(eg, hertz and Hz), KHz gradually became kHz. The latter is now common
usage.

MHz remained MHz, because m has always represented "milli". MHz is
megahertz, mHz is millihertz.

While we're at it, let's note that S represents siemens, s represents
seconds. mS is millisiemens, not milliseconds.