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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]]. | ||
The [[7F10]] uses the 7A29's amplifier board after the optical/electrical converter. | |||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 1 GHz (in [[7104]]) }} | |||
{{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) }} | |||
{{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 }} | |||
{{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. | |||
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== |