High Impedance Buffer Amplifier System DC 500MHz, 1MOhm / 10pF. The Tektronix TCA-1MEG is a High-Impedance Buffer Amplifier System and extends the capabilities of Tektronix high-performance oscilloscopes, making them ideal for a variety of general-purpose measurements. It provides a 1 MΩ path that is easily removed and replaced with a wide array of TekConnect probes, amplifiers, and adapters. Bandwidth: DC to >= 500 MHz Input impedance: 1 MΩ / 10 pF Bandwidth limiting: Full/100 MHz/20 MHz Input coupling: DC/AC/GND Includes P6139A, 500 MHz, 10x Passive Probe TekConnect interface delivers superior signal fidelity, unparalleled versatility, and ease-of-use