3S1
The Tektronix Type 3S1 is a dual-trace sampling plug-in for 560-series scopes. The risetime is 350ps.
In contrast to modular sampling plug-ins like the 3S2, the 3S1 has built-in sampling heads. The signal enters through GR-874 connectors on the front panel. Each channel has a resistive trigger pickoff followed by a 55ns coaxial delay line. Following the delay line is a compensation circuit designed to (partially) undo the pulse degradation caused by the delay line, and also to provide proper termination for low return loss at the input. Next in the main signal path is a four-diode sampling bridge driven by a snap-off diode, D73.
The many ways, the 3S1 is similar to the 4S1, but more compact.
The 3S1 provides +100VDC and -12.2VDC probe power.
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front view
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left view
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right view
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top view
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bottom view
