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7T11: Difference between revisions
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* [[Media:070-0986-00.pdf|Tektronix 7T11 Manual]] (OCR) | * [[Media:070-0986-00.pdf|Tektronix 7T11 Manual]] (OCR) | ||
* [[Media:070-6176-00.pdf|Tektronix 7T11A Manual]] | * [[Media:070-6176-00.pdf|Tektronix 7T11A Manual]] (OCR) | ||
* [[Media:7T11A Modification Insert.pdf|7T11A Modification - Manual Insert]] | * [[Media:7T11A Modification Insert.pdf|7T11A Modification - Manual Insert]] | ||
* [http://www.perdrix.co.uk/7T11Conversion/index.htm Dave Partridge's Report on Converting a Tektronix 7T11 to a 7T11A] | * [http://www.perdrix.co.uk/7T11Conversion/index.htm Dave Partridge's Report on Converting a Tektronix 7T11 to a 7T11A] | ||
}} | }} | ||
The '''Tektronix 7T11''' is a time base plug-in for the [[7000-series scopes]]. | The '''Tektronix 7T11''' is a [[sampling oscilloscope|sampling]] time base plug-in for the [[7000-series scopes]] that was [[introduced in 1969]]. | ||
It | It is specially designed to work in conjunction with one or two [[7S11]] samplers and their [[7000_and_3S_series_sampling_heads|sampling head plug-ins]]. | ||
Because the 7T11 and 7S11 have [[7000-series Sampling Shoe|direct interconnections side by side]], they also work in slow mainframes. | Because the 7T11 and 7S11 have [[7000-series Sampling Shoe|direct interconnections side by side]], they also work in slow mainframes. | ||
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==Operation== | ==Operation== | ||
Due to its sampling principle (so called equivalent time sampling or undersampling), the 7T11 can only be used on repetitive signals | Due to its sampling principle (so called equivalent time sampling or undersampling), the 7T11 can only be used on repetitive signals. | ||
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. | This delay is adjustable on the front panel to select the portion of interest. | ||
At the three lowest time position ranges, the 7T11 changes from equivalent time sampling to real-time sampling. | At the three lowest time position ranges, the 7T11 changes from equivalent time sampling to real-time sampling. | ||
To obtain maximum bandwidth, the sampling heads contain no delay lines, 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. | To obtain maximum bandwidth, the sampling heads contain no delay lines, 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 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. | In this case, an internal PLL locks to the signal and generates an internal pre-trigger. | ||
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<gallery> | <gallery> | ||
Tek 7t11 front.jpg|7T11 front | Tek 7t11 front.jpg | 7T11 front | ||
Tek 7t11 side connection.jpg|7T11 [[7000-series_Sampling_Shoe|side connector]] | Tek 7t11 side connection.jpg | 7T11 [[7000-series_Sampling_Shoe|side connector]] | ||
7s11-s4-7t11a-1ghz.jpg | 7T11A and [[7S11]] with [[S-4]] in a [[7613]] mainframe displaying a 1 GHz sine | 7s11-s4-7t11a-1ghz.jpg | 7T11A and [[7S11]] with [[S-4]] in a [[7613]] mainframe displaying a 1 GHz sine | ||
7t11a.jpg | 7T11A front | 7t11a.jpg | 7T11A front | ||
Tek 7t11.jpg | Tek 7t11.jpg | | ||
Tek-7t11-right.jpg | Right view | Tek-7t11-right.jpg | Right view | ||
Tek-7t11-left.jpg | Left view | Tek-7t11-left.jpg | Left view | ||
7t11-trigger.JPG | Trigger board in a 7T11 | 7t11-trigger.JPG | Trigger board in a 7T11 | ||
Tek-7t11-trigger-back.jpg | Back side of trigger board | Tek-7t11-trigger-back.jpg | Back side of trigger board | ||
Tek-7t11-timing.jpg | Timing board in a 7T11 | Tek-7t11-timing.jpg | Timing board in a 7T11 | ||
7t11-cr28.JPG | 7t11-cr28.JPG | Tunnel Diode CR28 in a 7T11 | ||
7t11a-cr28.JPG | 7t11a-cr28.JPG | Tunnel Diode CR28 in a 7T11A | ||
Tek-7t11-arming.jpg | Arming circuit detail (tunnel diodes CR142, CR152) | Tek-7t11-arming.jpg | Arming circuit detail (tunnel diodes CR142, CR152) | ||
Time-base-knob.jpg | Time base knob with sleeve insert | Time-base-knob.jpg | Time base knob with sleeve insert | ||
</gallery> | </gallery> | ||
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<gallery> | <gallery> | ||
S6_8GHz.jpg | S6_8GHz.jpg | noisy 8 GHz taken with 7T11 and [[7S11]] + [[S-6]] in a [[7904]] | ||
7s11-1ghz-norm.jpg | [[7S11]], 7T11, [[S-4]] displaying a 1 GHz sine (normal mode) | 7s11-1ghz-norm.jpg | [[7S11]], 7T11, [[S-4]] displaying a 1 GHz sine (normal mode) | ||
7s11-1ghz-smooth.jpg | 7S11, 7T11, S-4 displaying a 1 GHz sine (smooth mode) | 7s11-1ghz-smooth.jpg | 7S11, 7T11, S-4 displaying a 1 GHz sine (smooth mode) | ||
7s11-1ghz-smooth-store.jpg | 7S11, 7T11, S-4 displaying a 1 GHz sine (smooth mode, variable-persistence storage display of a [[7613]] mainframe) | 7s11-1ghz-smooth-store.jpg | 7S11, 7T11, S-4 displaying a 1 GHz sine (smooth mode, variable-persistence storage display of a [[7613]] mainframe) | ||
Tek 7633 7s11 7t11.jpg|Rackmount [[7633]] with two [[7S11]] and a 7T11 displaying a 2 GHz sinewave | Tek 7633 7s11 7t11.jpg | Rackmount [[7633]] with two [[7S11]] and a 7T11 displaying a 2 GHz sinewave | ||
</gallery> | </gallery> | ||