S-6

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Template:Plugin Sidebar 2 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.

Key Specifications

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
Features
  • No internal trigger pick-off signal
  • No internal termination

Internals

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.

Links

Pictures

  • S-6 front

    S-6 front

  • S-6, entire plugin

    S-6, entire plugin

  • S-6 sampling head and S-52 pulse generator head in a 7S12 TDR/Sampler plugin

    S-6 sampling head and S-52 pulse generator head in a 7S12 TDR/Sampler plugin

  • S-6 with a black face plate

    S-6 with a black face plate

  • S-6 schematic

    S-6 schematic

  • S-6 internal left side

    S-6 internal left side

  • S-6 internal right side

    S-6 internal right side

  • S-6 internal right side

    S-6 internal right side

  • S-6 internal left side, Preamp board removed

    S-6 internal left side, Preamp board removed

  • S-6 internal all boards removed, 155-0053-00 hybrid remains

    S-6 internal all boards removed, 155-0053-00 hybrid remains

  • S-6 Preamp board top

    S-6 Preamp board top

  • S-6 Preamp board backside

    S-6 Preamp board backside

  • S-6 Strobe board backside

    S-6 Strobe board backside

  • S-6 interconnect board

    S-6 interconnect board

  • 155-0053-00 hybrid sampling diode assembly

    155-0053-00 hybrid sampling diode assembly

  • 155-0053-00 hybrid sampling diode assembly (internal)

    155-0053-00 hybrid sampling diode assembly (internal)

  • 155-0053-00 hybrid sampling diode assembly with lid

    155-0053-00 hybrid sampling diode assembly with lid

  • 155-0053-00 hybrid sampling diode assembly (internal)

    155-0053-00 hybrid sampling diode assembly (internal)

  • 155-0053-00 hybrid sampling diode assembly (internal)

    155-0053-00 hybrid sampling diode assembly (internal)

Measurements

  • Impulse taken with S6 sampling head. Every dot is equivalent to one sample taken, and combined on the CRT with a rate of app. 100 Hz. Bright dots are newer than dimmed ones.

    Impulse taken with S6 sampling head. Every dot is equivalent to one sample taken, and combined on the CRT with a rate of app. 100 Hz. Bright dots are newer than dimmed ones.

  • 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.

    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.

  • "Self Portrait" of an S-6: A pulse reflected on the unterminated "through" path (approx. 120 ps one way)

    "Self Portrait" of an S-6: A pulse reflected on the unterminated "through" path (approx. 120 ps one way)

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