Check the listing for details. High-Z Spectrum Analyzer Amplifier, 1MOhm, 4pF, FETAMP1. Condition: New. Listed at 560.95 USD. Mathews Engineering Model: FETAMP1 Compensation Procedure Video Multi-drop Application Example Video Line Driver Application Example Video High input impedance low noise buffer amplifier. Allows the use of oscilloscope probes with 50 ohm spectrum analyzer input DC-400 MHz BandwidthInput: 1 Megaohm, 4 pF, BNC(f)DC Input resistance can be increased to up to 500 GigaOhms by removing R3, internal 1 MOhm resistor (charge amplifier)Output: 50 Ohms, Type N(f) Gain: 1X into 50 ohms or 2X into 1 MOhmWorks by itself or with 10X or 100X scope probes (not included)Solid billet construction, durable black wrinkle powder coatUltra low noise, virtually no spurious Operates from batteries, 120 VAC, or USB power 6 hour battery life (3 x AAA alkaline)USB cord draws power from the USB port on your oscilloscope (62 mA) Unambiguous ON/OFF power LED indicates "in specification" operation Full specifications show with product imagesApplications: Allows the use of oscilloscope probes with 50 ohm test equipmentTurns any 50 ohm input into a 1 MOhm oscilloscope type inputAllows remote use of scope probes in hard to reach places (output will drive a lengthy 50 ohm transmission line)Signal distribution and monitoring (drive oscilloscope, frequency counter, and spectrum analyzer simultaneously)Network analysis (Hi-Z A/B sweeps)Control system stability analysis IF Strip Engineering, RF engineeringWhat's Included: FETAMP1 Buffer AmplifierN(m)-N(m) AdapterDC Block (BNC)USB Power Cordipod type 120VAC to USB Power Adapter3 AAA Alkaline BatteriesUsers Manual Customer Comment: "Exactly what I needed for power supply bode plots with HP4195A network analyzer."Factory New & Made in the USA Shipping weight is 2 lbs. 8"x5"x5" box. Indiana Residents Must Pay 7% Sales Tax Ships to US customers or countries supported by the eBay global shipping program.