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Tektronix SD-22
12.5 GHz dual channel Sampling Head
Tektronix SD-22 Sampling Head

Compatible with 11800-series scopes

Produced from 1989 to (?)

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix SD-22 is a low-noise sampling head for 11800 series digital sampling scopes.

From the Tektronix site:

The SD22 is a dual-channel, 12.5 GHz sampling head specifically designed for low-noise measurement in digital communications and device characterization applications. It provides an acquisition rise time of 28 ps, and typically 450 µVRMS of displayed noise. With smoothing, noise levels are 180 µVRMS.

In order to precisely capture and display the switching characteristics of high-speed communications circuits, to make accurate statistical measurements of signal noise and signal timing jitter, or to obtain stable timing measurements of fast digital ICs, the noise floor of the test equipment must be kept to a minimum. The SD22 is the ideal instrument for these low-noise applications.

Key Specifications

Rise time 28 ps
Bandwidth 12.5 GHz
Sampling repetition rate 100 Hz to 200 kHz
Time coincidence 10 ps between channels
Maximum input voltage 1 Vp-p, 1.6 Vp-p operating, ±3 V non-destructive
Noise 800 μVRMS max., 400 μVRMS typ. (400/180 μV with smoothing)
Time coincidence 10 ps between channels
Input 3.5 mm connector