Tektronix ADA400A Active Differential Preamplifier, 100 dB CMRR, DC-1 MHz

ADA400A differential preamplifier allows direct measurement of very low amplitude voltages and floating signals (not referenced to ground) using an oscilloscope. Both input terminals have high impedance, so no additional grounding is required in the DUT, avoiding interference with measurements or circuit ground loops.

Main Performance Specifications

• 10 μV/div sensitivity
• Typical 100 dB CMRR from DC to 10 kHz

Main Features

• Active differential preamplifier
• Integrated probe power with TEKPROBE™ BNC

Connectivity

• ADA400A is directly powered by TDS400, TDS500, TDS600, TDS700, TDS5000, TDS7000 (TEKPROBE), TDS7000 (TekConnect), and TCA-1MEG series oscilloscopes.
• ADA400A can also be powered by the 1103 probe power supply.

Applications

• Mechanical Analysis

• Audio Design

• Biomedical Research (without patient connection certification)

• Medical Devices (without patient connection certification)

ADA400A

The ADA400A differential preamplifier features high gain and extremely high common-mode rejection, allowing it to measure voltages as low as 5 μV even in high-noise environments. Optional bandwidth limiting can reduce normal-mode noise from digital logic, switching power supplies, and line-frequency sources. Adjustable differential offset allows the user to eliminate sensor bridge offsets and potentials in the test setup. An "infinite impedance" mode can be selected in the two highest gain ranges for precise measurement of signals with high source impedance.