B170-V: Difference between revisions

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The B170-V is a an attenuator for the [[517]].
The '''B170-V''' is a 170 Ω attenuator for the [[517]].  
Switches select from 0 to 64 dB of attenuation.
 
[[John Addis]] wrote:
<blockquote>
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.
</blockquote>


<gallery>
<gallery>
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File:Tek b170-v inside.jpg
File:Tek b170-v inside.jpg
File:Tek b170-v trimmed.jpg|Hand-trimmed resistors
File:Tek b170-v trimmed.jpg|Hand-trimmed resistors
File:Tek 517a b170a att.png|Schematic
</gallery>
</gallery>
[[Category:Attenuators]]

Revision as of 22:50, 8 September 2016

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.