7T11

7T11 sampling sweep unit

7T11 is a time base plugin for the 7000 mainframe family. It was specialy designed to build a sampling scope configuration together with the 7S11 including one of the sampling heads. Fastest sweep is 10pS/div and lowest jitter is 10pS, depending on actual settings.

Trigger bandwith is 500MHz at internal and 1 GHz at external trigger sources. Additional there is an internal 200MHz oscillator with analog trigger count down, which can be synchronized from external signals up to 14GHz.

Due its sampling principle ( so called undersampling ) it can only be used on periodic signals and samples are allways taken from signal portions delayed from the trigger event. This delay is adjustable on the frontpanel to select the portion of interest. At the three lowest sweep ranges the 7T11 changes from the undersampling principles to realtime sampling.

Due the high bandwith of the sampling heads, there is no Y-delay-line in the heads, so the 7T11 needs an external pretrigger, if there are random, high jitter signals or if the original signal triggered onto shall be observed. In the special case of a periodic signal with low jitter, a so called random trigger mode can be used, so that the signal triggered on can be observed. In this case a internal PLL locks to the signal and generates a internal pretrigger. If only bandwiths of up to 3GHz are needed, single events can be observed directly be using the 7M11 analog delay line plugin.

Manual or external sweep is possible to connect a slow pen plotter.

Because the 7T11 and 7S11 have direct interconnections side by side, they work also in slow mainframes. The 7T11 supports up to two 7S11 and allows also xy-operation.

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  Right view

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  Left view

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  noisy 8GHz taken with 7T11,7S11,S6,7904