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The ADA400A Differential Preamplifier allows direct oscilloscope measurements of very low amplitude voltages and signals which are not ground referenced. The high impedance of both inputs eliminates the need to add additional ground points in the DUT, thereby avoiding circulating currents which disturb the measurement or the circuit.

Key performance specifications

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

Key features

• Active differential preamplifier
• Integral probe power with TEKPROBE? BNC

Connectivity

• The ADA400A is powered directly from TDS400, TDS500, TDS600, TDS700, TDS5000, TDS7000 (TEKPROBE), TDS7000 (TekConnect) w/ TCA-1MEG Series oscilloscopes.

• The ADA400A may also be powered by a 1103 Probe Power Supply.

Applications

• Mechanical analysis
• Audio design
• Biomedical research (not certified for patient connection)
• Medical equipment (not certified for patient connection)

ADA400A

The high gain and extremely high common mode rejection of the ADA400A Differential Preamplifier provide usable measurements of voltages as low as 5 μV, even in high-noise environments. Selectable bandwidth limiting reduces normal mode noise from digital logic, switch mode power supplies, and line frequency sources. Adjustable differential offset allows the user to null out transducer bridge bias and galvanic potential from the test setup. An "infinite impedance" mode can be selected in the two highest gain ranges allowing accurate measurements of signals with high source impedance.