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The Tektronix Type 4S1 is a dual-trace [[sampling_oscilloscope|sampling]] unit for the [[661]]. | The Tektronix Type 4S1 is a dual-trace [[sampling_oscilloscope|sampling]] unit for the [[661]]. | ||
The 4S1 was [[introduced in 1962]]. | The 4S1 was developed in 1961 and [[introduced in 1962]]. | ||
Each channel has a trigger pickoff, a [[delay line]], and a sampler. | Each channel has a trigger pickoff, a [[delay line]], and a sampler. | ||
Specified rise time is 350ps. | Specified rise time is 350ps. |