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Delay line: Difference between revisions
→Lumped L-C
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Lumped L-C delay lines are used in the [[511|511AD]], [[513|513D]], [[514|514D]], [[541]], [[545]], [[551]], [[555]], and [[524]]. | Lumped L-C delay lines are used in the [[511|511AD]], [[513|513D]], [[514|514D]], [[541]], [[545]], [[551]], [[555]], and [[524]]. | ||
These delay lines must be carefully adjusted for best pulse response. | These delay lines must be carefully adjusted for best pulse response. | ||
A typical lumped L-C delay line has about 30 sections, and each section typically | A typical lumped L-C delay line has about 30 sections, and each section typically has an adjustable capacitor. | ||
has an adjustable capacitor. In some applications, lumped L-C delay lines | In some applications, lumped L-C delay lines were preferred over distributed delays (e.g., coax) because of impedance. | ||
were preferred over distributed delays (e.g., coax) because of impedance. It is possible | It is possible for a lumped L-C delay line to have a characteristic impedance of 1000 Ω, while most coaxial cables are 125 Ω or less. | ||
for a lumped L-C delay line to have a characteristic impedance of | |||
most coaxial cables are | |||
<gallery> | <gallery> | ||
Tek_514d_delay_trimmers.jpg|Delay line trimmer capacitors in a [[514D]]. | |||
551_leftint.jpg|Delay line in a [[551]] wraps around the rear left side of the scope. | |||
Tek 545a delay close.jpg|Section of delay line of [[545A]]. Trimmer capacitors can be seen behind the inductor. | |||
Tek 533a delay line 1.jpg | Tek 533a delay line 1.jpg | ||
Tek 533a delay line 2.jpg | Tek 533a delay line 2.jpg | ||