Tag Results for
"Voltmeter" - 3 Total Result(s)
Front face of the HP 400A vacuum tube voltmeter.
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A Jolt to the Line: HP 400A Voltmeter
The 400A vacuum tube voltmeter was Hewlett-Packard’s first voltmeter. Voltmeters would become one of the young company’s most important business avenues.
Advertisement for the HP 400AC voltmeter from 1948.
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A Revolution: HP 400AC Voltmeter
When Dave Packard designed the HP 400AC voltmeter in 1948, he was on to something big. This product launched the beginning of a voltmeter product line that would continue for 50 years and more than a ...
Ad for the HP 400A voltmeter from 1946.
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Measured for Success: HP 400A Ad
Hewlett-Packard voltmeters would become one of the longstanding, reliable products offered by the company in the postwar period. The 400A model was engineered for “dependability and uniformity of accu ...