Tektronix SD30

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The SD30 is a single channel, high-performance sampling head that can be installed in the 11800 Series digital sampling oscilloscopes, the SM-11 multi-channel unit, or the CSA803 Series communications signal analyzers.

The sampling head acquisition system performs the function of a very fast sample-and-hold circuit for the mainframe instrument. It uses local analog feedback to achieve high accuracy and high throughput for repetitive input signals. For random input signals such as those found in eye diagram measurements, accuracy depends on the dot transient response of the sampling head. Dot response can easily be adjusted through the enhanced accuracy menu in the mainframe.

The strobe drive signal from the instrument controls the timing of the strobe assertion to the acquisition system. The strobe sense signal is a part of the strobe signal returned to the instrument. The instrument monitors the time duration of the strobe drive/strobe sense loop and adjusts a delay inside the instrument to maintain correct strobe timing.

• Bandwidth: Better than ±3 dB to 40 GHz
• Sampling repetition rate
  • Maximum: 200 kHz
  • Minimum: 100 Hz
• Rise time: 8.8 ps or less
• Abberations
  • 10 ns to 20 ps before step: ±3% or less, typical
  • <300 ps after step: +12%, -5% or less, typical
  • 3 ns to 10 ns after step: +5.5%, -3% or less, typical
  • elsewhere: ±0.5% or less, typical
• Maximum safe input signal voltage: ±2 V
• Maximum operating input: 1.6 Vp-p
• Maximum signal voltage: 1.0 Vp-p
• Dot transient response (Accuracy after calibration at operating temperature): ±5% for signals up to 0.5 Vp-p
• Delayed noise
  • Unity dot response: <2.3 mVrms, 1.8 mV typical
  • With smoothing: <1 mVrms, 700 mV typical
• Input termination impedance: 50 Ω ±0.5Ω
• A SELECT CHANNEL button for quick trace selection from the sampling head front panel
• Precision 2.9 mm connector (Wiltron Co - K type) that is mechanically compatible with 3.5 mm and SMA connectors