Första oscilloskopet - DuMont?

[4kTRB]

http://www.eetimes.com/anniversary/desi ... copes.html
Kul info om första op:n finns med här också plus lite annat mixat godis.

[JimmyAndersson]

Intressant läsning.


Det här var lite kul: (Speciellt andra och sista stycket.)

General Radio's big move came in 1934, when it announced the Type
687-A Electron Oscillograph. A complete scope, the 687-A included CRT,
power supply and sweep circuit, all in one housing.

Deflection sensitivity ranged from 1 V/ to 5 V/,
a linear function of anode voltage, which could be adjusted from
500 to 2,500 V. By today's standards, the instrument was far from
sensitive, since signals were applied directly to the deflection plates.
Plate capacitance was specified as less than 1.5 F.

This was before micro-micro became pico and before units derived
from a person's name (like the farad from Michael Faraday) were
spelled out lower case and abbreviated with an initial (and most
often single) capital letter. Today that capacitance would be 1.5 pF.
The frequency range was specified-rather modestly.

"Even at frequencies of 30 megacycles per second,"
a catalog supplement proclaimed before hertz was invented,
"the envelope patterns are fairly good, especially when the radio-
frequency deflection is used in one direction only and the time axis
obtained with a rotating mirror or a moving film camera."

[hcb]

>Plate capacitance was specified as less than 1.5 F.

Man får hoppas att prefixet fallit bort

Edit: OK, det är väl rätt säkert att det är <1.5 F ...