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The Tektronix SD-20 Loopthrough Sampling Head is a single-channel, 20 GHz loop-through sampling head designed for low-loss testing in applications such as microwave systems research and development, digital device characterization and high-speed digital communications circuit design.

Lik the older S-6, the SD-20 is nonterminated and routes the signal of interest directly through the sampling head without the need of a power divider, thus keeping losses to a minimum. The SD-20 can also be used for customized TDR measurements of transmission lines and controlled impedance devices. An external signal generator may be used, instead of the SD-24 step generator, to tailor the TDR stimulus to fit a particular situation. For instance, slower slew rates or higher amplitude may be utilized, or you may perform half-sine or impulse testing. In digital communications, the SD-20 is useful for viewing and triggering on the clock signal without the use of a power divider.


Rise time 17.5 ps
Bandwidth 20 GHz typ.
Noise typically 750 µVRMS, 1.2 mVRMS max. (350 µV typ./550 µV max. with smoothing)
Max. input 1.0 Vp-p signal, 1.6 Vp-p (AC+Offset) operating, ±3 V non-destructive
Sampling rate 100 Hz - 200 kHz
Signal connections 50 Ω 3.5 mm connectors