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The Tektronix S-6 Sampling Head plug-in is a 50 Ω feed-through unit with a rise-time of 30 ps and bandwidth of 11.5 GHz. It was introduced in 1971.

The S-6 provides two unterminated 50 Ω SMA connections in a loop-through configuration as is convenient for TDR applications. It is good practice to leave a termination resistor on the unit when unused to give some protection against electrostatic discharge. The S-6 does not provide a trigger pickoff signal.


Rise time 30 ps
Bandwidth 11.5 GHz
Operating input voltage range 1 Vp-p
Maximum single sample step 250 mV for less than 5% aberration
Maximum input voltage ±5 VDC
Input impedance 50 Ω (unterminated!)
Noise < 5 mV of noise
  • No internal trigger pick-off signal
  • No internal termination


The S-6 is very similar to the S-4 in that it uses a 6-diode traveling wave trapped-charge sampling gate. This gate is implemented in the 155-0053-00 hybrid. Since the S-6 is a feed-through sampling head, the blow-by compensation is implemented slightly differently using a 10 k resistor in the hybrid directly connected to the input signal. The S-6 replaces the discrete preamplifier of the S-4 with two opamps from a 155-0035-00 quad opamp chip. The two other opamps are used to buffer the gate bias voltages.