B170-V: Difference between revisions
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The '''B170-V''' is a 170 Ω attenuator for the [[517]]. | {{Instrument Sidebar | ||
Switches select from 0 to 64 dB of attenuation. | |manufacturer=Tektronix | ||
|model=B170-V | |||
|class=Attenuator | |||
|series= | |||
|summary=70 Ω attenuator for the [[517]] | |||
|image=Tek b170-v top.jpg | |||
|caption=Tektronix B170-V' | |||
|introduced=(?) | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* ''please add'' | |||
}} | |||
The '''B170-V''' is a 170 Ω attenuator for the [[517]]. Switches select from 0 to 64 dB of attenuation. | |||
[[John Addis]] wrote: | [[John Addis]] wrote: | ||
<blockquote> | <blockquote> | ||
The inductors compensate for the switch stray capacitances. When the Ls and | The inductors compensate for the switch stray capacitances. | ||
the stray Cs are connected like that, they constitute a lumped element delay | When the Ls and the stray Cs are connected like that, they constitute a lumped element delay line. | ||
line. The intent is not to make a delay line, but compensate out all the | The intent is not to make a delay line, but compensate out all the stray Cs by making a lumped delay line out of it. | ||
stray Cs by making a lumped delay line out of it. That extends the | That extends the bandwidth and makes the impedance 170 ohms (up to 1 GHz or so) rather than a bunch of Cs sitting on the connection from input to output. | ||
bandwidth and makes the impedance 170 ohms (up to 1 GHz or so) rather than a | |||
bunch of Cs sitting on the connection from input to output. | |||
</blockquote> | </blockquote> | ||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek b170-v top.jpg | |||
B170-V_1.jpg | A (?) | B170-V_1.jpg | A (?) | ||
B170-A_2.jpg | B170-A_2.jpg | ||
B170-A_3.jpg | B170-A_3.jpg | ||
Tek b170-v inside.jpg | |||
Tek b170-v trimmed.jpg|Hand-trimmed resistors | |||
Tek 517a b170a att.png|Schematic | |||
</gallery> | </gallery> | ||
[[Category:Attenuators]] | [[Category:Attenuators]] | ||
Revision as of 11:21, 18 August 2021
The B170-V is a 170 Ω attenuator for the 517. Switches select from 0 to 64 dB of attenuation.
John Addis wrote:
The inductors compensate for the switch stray capacitances. When the Ls and the stray Cs are connected like that, they constitute a lumped element delay line. The intent is not to make a delay line, but compensate out all the stray Cs by making a lumped delay line out of it. That extends the bandwidth and makes the impedance 170 ohms (up to 1 GHz or so) rather than a bunch of Cs sitting on the connection from input to output.
Pictures
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A (?)
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Hand-trimmed resistors
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Schematic
