From TekWiki
Jump to navigation Jump to search
Tektronix S-6
Sampling Head
S-6 head

Compatible with 7000 and 3S series sampling heads

Produced from 1971 to 1990

Manuals – Specifications – Links – Pictures

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 strongly recommended 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.

Key Specifications

Rise time 30 ps
Bandwidth 11.5 GHz
Input voltage 1 Vp-p (operating)
Maximum input ±5 VDC
Maximum single sample step 250 mV for less than 5% aberration
Input impedance 50 Ω (unterminated!)
Noise < 5 mV of noise


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.


Documents Referencing S-6

Document Class Title Authors Year Links
42W-5850.pdf Application Note Preventing Sampling Head Overdrive and Static Damage Gary Mott 1985
Rochester LLE Review Volume 25.pdf Article Computerized, Wide-Bandwidth, Multichannel, Soft X-Ray Diode Spectrometer for High Density Plasma Diagnosis 1985
RISOM2873.pdf Article Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET Erik Kristensen 1990


1979: $1,345 (~$5,600 in 2023 dollars)

According to an internal memo, annual sales were estimated at 225 units in 1979.




Some Parts Used in the S-6

Part Part Number(s) Class Description Used in
152-0335-00 152-0335-00 Discrete component step recovery diode S-4 S-6
152-0335-01 152-0335-01 Discrete component 150 ps step recovery diode 1502 S-2 S-4 S-6
155-0035-00 155-0035-00 155-0116-00 Monolithic integrated circuit quad op-amp 3110 3S7 3T7 492 492A 492AP 492P 494 494P 496 496P 4010 4011 4012 4013 7L5 7L12 7L13 7L14 7L18 7S11 7T11 7S12 S-6 1461 4602 P7001 613 653
155-0053-00 155-0053-00 Hybrid integrated circuit sampler S-6