On 12/7/2011 8:00 PM, spamtrap1888 wrote:
In my youth I often puzzled why HP test equipment was rated to work
off 400 Hz -- why did the Air Force use that?

Because the power transformers, filter chokes and capacitors
were smaller and lighter. Both very important things when
designing aircraft equipment.

Jeff


--
"Everything from Crackers to Coffins"