434: Difference between revisions
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of isolated pads behind the [[phosphor]] where the electron beam is then blocked or released. | of isolated pads behind the [[phosphor]] where the electron beam is then blocked or released. | ||
There is a chopped two channel system and the fastest sweep time is | There is a chopped two channel system and the fastest sweep time is 20ns/div. | ||
An option for a tube with higher sensitivity at high writing speeds was available too. | An option for a tube with higher sensitivity at high writing speeds was available too. | ||
Revision as of 18:39, 3 March 2013
The 434 is a analog CRT storage scope with two independent storage areas on the screen. It has a bandwith of 24 MHz and uses a tunnel diode in its trigger circuit. The storage is done in the CRT itself, by trapping charge on a special fine grid of isolated pads behind the phosphor where the electron beam is then blocked or released.
There is a chopped two channel system and the fastest sweep time is 20ns/div. An option for a tube with higher sensitivity at high writing speeds was available too.
The signal passes through rotary cam-operated input attenuators, then a JFET source-follower buffer that uses a 2N5911A (Tektronix part number 151-1032-00).
