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|
|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|
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.
- S-6 internal photo and simulation
- Repairing an S-6 head (with internal photos)
- S-6 @ amplifier.cd 7S12 page
- S-6 @ barrytech.com
S-6 internal all boards removed, 155-0053-00 hybrid remains
155-0053-00 hybrid sampling diode assembly
155-0053-00 hybrid sampling diode assembly with lid
Incident pulse from an S-52 (nom. < 25 ps) displayed by an S-6 head (nom. < 30 ps), both installed in a 7S12. Displayed rise time ~35 ps confirms spec.