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7T11: Difference between revisions
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{{Plugin Sidebar| | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Sampling | |series=7000-series scopes | ||
image=7t11a.jpg | | |type=7T11 | ||
caption=Tektronix | |summary=Sampling sweep plugin | ||
|image=7t11a.jpg | |||
|caption=Tektronix 7T11A sampling sweep unit | |||
|introduced=1969 | |||
manuals= | |discontinued=1990 | ||
* [ | |designers=George Frye;Al Zimmerman;Gene Cowan | ||
* [ | |manuals= | ||
* [ | * [[Media:070-0986-00.pdf|Tektronix 7T11 Manual]] (OCR) | ||
* [[Media:070-6176-00.pdf|Tektronix 7T11A Manual]] (OCR) | |||
* [[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 [[sampling oscilloscope|sampling]] time base plug-in for the [[7000-series scopes]] that was [[introduced in 1969]]. | |||
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. | |||
The 7T11 supports up to two 7S11 for dual channel or X–Y operation. | |||
It was designed by [[George Frye]], [[Al Zimmerman]], and [[Gene Cowan]]. | |||
Due its sampling principle (so called undersampling), the 7T11 can only be used on | {{BeginSpecs}} | ||
repetitive signals | {{Spec | Sweep rate | 5 ms/Div to 10 ps/div in a 1−2−5 sequence. Variable speed-up ×2.5 on all ranges (i.e. down to 4 ps/Div) }} | ||
from the trigger event. This delay is adjustable on the front panel to select | {{Spec | Time position Range | 50 ms to 50 ns in 10x steps. 50 ms to to 0.5 ms ranges are real time, 50 μs to 50 ns equivalent time sampling}} | ||
the portion of interest. At the three lowest | {{Spec | Time accuracy | 3%}} | ||
from | {{Spec | Trigger bandwidth | 500 MHz internal, 1 GHz from external trigger sources, 12.4 GHz in HF Sync mode }} | ||
{{Spec | Trigger sensitivity | | |||
* ×1 internal: 125 mV to 1 V<sub>p-p</sub>, 5 kHz to 500 MHz | |||
* ×10 internal: 12.5 mV to 1 V<sub>p-p</sub>, 5 kHz to 50 MHz | |||
* ×1 external 50 Ω: 12.5 mV to 2 V<sub>p-p</sub>, DC to 1 GHz | |||
* ×10 external 50 Ω: 1.25 mV to 2 V<sub>p-p</sub>, 1 kHz to 50 MHz | |||
* ×1 external 1 MΩ: 12.5 mV to 2 V<sub>p-p</sub>, DC to 100 MHz | |||
* ×10 external 1 MΩ: 1.25 mV to 2 V<sub>p-p</sub>, 1 kHz to 50 MHz | |||
* HF Sync mode: 10 mV to 500 mV<sub>p-p</sub> @ 1 GHz, 200 mV to 500 mV<sub>p-p</sub> @ 12.4 GHz | |||
}} | |||
{{Spec | Input impedance (Trig Input) | selectable, 1 MΩ / 50 Ω }} | |||
{{Spec | Max. input | | |||
* 1 MΩ: 100 V DC or P-P to 1 kHz, derate at −6 dB/octave above 1 kHz down to 5 V<sub>p-p</sub> | |||
* 50 Ω: 2 V (DC + peak AC) | |||
}} | |||
{{Spec | Jitter | | |||
* Sequential mode: < 10 ps at fastest sweep, < 0.4 Div otherwise | |||
* Random mode: < 30 ps at fastest sweep, 1 Div otherwise | |||
* HF Sync mode: < 20 ps with 12.4 GHz, 200 mV<sub>p-p</sub> signal | |||
}} | |||
{{EndSpecs}} | |||
==Links== | |||
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7T11A.htm Tek 7T11A page @ amplifier.cd] | |||
* [https://web.archive.org/web/20221204151726/http://www.barrytech.com/tektronix/tek7000/tek7t11.html Tek 7T11 page @ barrytech.com (waybackarchive) ] | |||
{{Documents|Link=7T11}} | |||
{{PatentLinks|7T11}} | |||
==Operation== | |||
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. | |||
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. | |||
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. | |||
To display the triggering event without slowing the sweep rate enough to see the next pulse, the input signal can be delayed by an external delay line such as the [[7M11]]. | |||
X-Y operation is possible up to 14 GHz if one 7S11 resides in the A-horizontal slot of a 4-slot mainframe. | |||
Manual or external sweep is possible to connect a slow pen plotter. | Manual or external sweep is possible to connect a slow pen plotter through [[Pin Tip]] jacks located on the front panel. | ||
Additionally, there is an internal 200 MHz tunnel diode oscillator, which can be synchronized from external signals up to 14 GHz. | |||
This oscillator in turn drives a 10 MHz tunnel diode oscillator that provides the internal trigger signal. | |||
The 7T11 uses a [[BSM connector]] for pulse output on the front panel. | 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 | Note that waveform acquisition with the 7T11 does not work in a [[7854]] mixed-mode scope because it uses the [[7000 Series plug-in interface|A1 sweep gate signal]] for blanking. | ||
The updated 7T11A does since it uses A17 for blanking. | |||
A 7T11 can be [http://www.perdrix.co.uk/7T11Conversion/index.htm field upgraded to 7T11A]. | |||
== | ==Internals== | ||
The 7T11 makes use of 5 tunnel diodes in its triggering circuits: 2x [[152-0140-01]] (CR29 & CR142), 2x [[152-0177-00]] (CR134 & CR152) and 1x [[152-0329-00]] for the RF sync (CR28). | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 7t11 front.jpg | 7T11 front | |||
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 | |||
7t11a.jpg | 7T11A front | |||
Tek 7t11.jpg | | |||
Tek-7t11-right.jpg | Right view | |||
Tek-7t11-left.jpg | Left view | |||
7t11-trigger.JPG | Trigger board in a 7T11 | |||
Tek-7t11-trigger-back.jpg | Back side of trigger board | |||
Tek-7t11-timing.jpg | Timing board in a 7T11 | |||
7t11-cr28.JPG | Tunnel Diode CR28 in a 7T11 | |||
7t11a-cr28.JPG | Tunnel Diode CR28 in a 7T11A | |||
Tek-7t11-arming.jpg | Arming circuit detail (tunnel diodes CR142, CR152) | |||
Time-base-knob.jpg | Time base knob with sleeve insert | |||
</gallery> | </gallery> | ||
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<gallery> | <gallery> | ||
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-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) | |||
Tek 7633 7s11 7t11.jpg | Rackmount [[7633]] with two [[7S11]] and a 7T11 displaying a 2 GHz sinewave | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|7T11}} | |||
[[Category:7000 series horizontal plugins]] | [[Category:7000 series horizontal plugins]] | ||
[[Category: | [[Category:7000 series sampling plugins]] | ||