7A29: Difference between revisions

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7A29 (view source)

Revision as of 02:24, 4 October 2015

567 bytes added ,  4 October 2015
specs
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There is also a [[7A29P]], which has digitally programmable gain, intended for the [[:Category:7000 series digitizer mainframes|7000 series digitizers]].
There is also a [[7A29P]], which has digitally programmable gain, intended for the [[:Category:7000 series digitizer mainframes|7000 series digitizers]].


==Specifications==
The [[7F10]] uses the 7A29's amplifier board after the optical/electrical converter.


* Bandwidth: 1 GHz (in [[7104]])
{{BeginSpecs}}
* Input impedance: 50 Ω
{{Spec | Bandwidth       | 1 GHz (in [[7104]]) }}
* 10 mV/div to 1V/div
{{Spec | Input impedance | 50±1 Ω, VSWR <1.2:1 from DC to 1 GHz (10 mV/Div: 1.4:1, Opt.4: 1.5:1) }}
* Single channel
{{Spec | Max. input      | max. 10 V<sub>RMS</sub> or 1 Ws pulses not exceeding 50 V; max. 100 V additional DC component in AC mode }}
* Option 4: variable delay
{{Spec | Deflection      | 10 mV/div to 1 V/div, 1-2-5, ±2%; variable 2.5:1 }}
{{Spec | Channels        | Single channel }}
{{Spec | Options        | Option 4: variable delay (1 ns) }}
{{EndSpecs}}


==Internals==
==Internals==


The 7A29 employs a number of Tek-made custom [[Hypcon]]-packaged hybrids, the
The 7A29 employs a number of Tek-made custom [[Hypcon]]-packaged hybrids, the [[155-0180-00]]  
[[155-0180-00]] fast input protection, [[155-0181-00]] input amplifier and  [[155-0175-00]] trigger amplifier (2 ×).
fast input protection, [[155-0181-00]] input amplifier and  [[155-0175-00]] trigger amplifier (2 ×).
 
It uses a "feed-beside" scheme implemented with standard low-frequency operational amplifiers to
compensate for low-frequency anomalies in the frequency response that are attributed to transistor heating.


It uses a "feed-beside" scheme to compensate for low-frequency anomalies in the frequency response that are attributed to transistor heating.
The input connector is a special Tek-made part that is exactly 50 Ω.  Typical BNC connectors are around 52 Ω.
The input connector is a special Tek-made part that is exactly 50 Ω.  Typical BNC connectors are around 52 Ω.


==Links==
==Links==


* [http://www.eevblog.com/forum/testgear/tektronix-7a29-teardown/ Tektronix 7A29 teardown]
* [http://www.eevblog.com/forum/testgear/tektronix-7a29-teardown/ Tektronix 7A29 teardown - nice detailed pictures of attenuator internals]


==Pictures==
==Pictures==
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/18903"

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