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Tektronix ADA400
Differential preamplifier
Tektronix ADA400 Differential Preamplifier

Produced from 1995 to (?)

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix ADA400 Differential Preamplifier allows direct oscilloscope measurements of very low amplitude voltages and signals which are not ground referenced. It attaches to a scope or 1103 power supply through a Tekprobe BNC connector.


  • 10 µV/div sensitivity
  • Typically 100 dB CMRR from DC to 10 kHz
  • Selectable bandwidth limiting
  • Adjustable differential offset
  • "Infinite impedance" mode in the two highest gain ranges