7T11

The Tektronix 7T11 is a time base plug-in for the 7000 mainframe family. It was specially designed to build a sampling oscilloscope configuration together with the 7S11 including one of the sampling heads. The fastest sweep is 10 ps/div and lowest jitter is 10 ps, depending on actual settings.

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

Due its sampling principle (so called undersampling), the 7T11 can only be used on repetitive signals and samples are always taken from signal portions delayed from the trigger event. This delay is adjustable on the front panel to select the portion of interest. At the three lowest sweep ranges, the 7T11 changes from undersampling to real-time sampling.

Due the high bandwidth of the sampling heads, there is no Y-delay-line in the heads, so the 7T11 needs an external pre-trigger if there are random, high-jitter signals or if the original signal triggered onto needs to be observed. In the special case of a periodic signal with low jitter, a random sampling mode can be used so that the signal triggered on can be observed. In this case, an internal PLL locks to the signal and generates an internal pre-trigger.

If only bandwidths of up to 3 GHz are needed, single events can be observed directly be using the 7M11 analog delay line plug-in. (This statement should be clarified. It seems to imply that a single event can be plotted using a 7T11.)

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 X–Y operation up to 14 GHz if one 7S11 resides in the A-horizontal slot.

The 7T11 uses a BSM connector for pulse output on the front panel.

Note the 7T11 does not work in a 7854 mixed-mode scope while the updated 7T11A does. A 7T11 can be field upgraded to 7T11A.

Specifications

please add

Links

• 7T11A page @ amplifier.cd
• http://www.barrytech.com/tektronix/tek7000/tek7t11.html

Pictures

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  7T11A and 7S11 with S-4 in a 7613 mainframe displaying a 1 GHz sine

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  7T11A front

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  Right view

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  Left view

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  Trigger board in a 7T11

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  Tunnel Diode CR28 in a 7T11

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  Tunnel Diode CR28 in a 7T11A

Measurements

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  noisy 8 GHz taken with 7T11 and 7S11 + S-6 in a 7904

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  7T11, 7S11, S-4 displaying a 1 GHz sine