7T11: Difference between revisions

{{Plugin Sidebar  

|manufacturer=Tektronix

|type=7T11  

|summary=Sampling sweep plugin

|image=7t11a.jpg  

|caption=Tektronix 7T11A sampling sweep unit

|introduced=1969

|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]]

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]].

{{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) }}

{{Spec | Time accuracy | 3%}}

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 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.

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 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).

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)

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

[[Category:7000 series sampling plugins]]