ADA400A - 

Differential Preamplifier with BNC Connector Interface

TDS3000B Series Digital Phosphor Oscilloscopes Adapt to Wide-Ranging Video Measurement Needs
A Tell-All Tool for Video Troubleshooting:
Many video engineers have remained loyal to analog oscilloscopes, believing the gradations on an analog display are the only way to see certain video waveform details. The TDS3000B has the same information-rich display as an analog oscilloscope, but with much more detail. Tektronix DPO technology provides a live display that captures anomalies while providing the intensity-graded vision you need to interpret the waveform. Both patterns and one-time events are easy to see and understand. With up to 500 MHz bandwidth and four inputs, the TDS3000B family provides ample performance for analog and digital video use. The TDS3000B is compact and light enough to meet field requirements as well as design and evaluation needs on the engineering bench. Two optional video modules add easy-to-use, video-specific measurement and display tools to the TDS3000B DPO series.
Introduction
Active Differential Probes allow you to view differential signals. Differential signals are signals that are referenced to each other rather than to ground. While a matched pair of single-ended probes can be used, a true differential probe typically gives higher performance, providing high CMRR, broad frequency range, and minimal time skew between inputs. Differential signaling transmits data over two complementary wires. The signal pair is routed together to a receiver, which subtracts them from each other to recover the original signal. Differential signaling is becoming more common as rates increase. Differential signaling eliminates common mode noise, It also reduces the need for a common reference voltage between the transmitter and the receiver against which the signal is compared to determine its logic level, eliminating some signal integrity issues such as “ground bounce”.
When your signal must be measured differentially, Tektronix has a range of differential probing solutions to fit your application. While a matched pair of single-ended probes can be used (see P6135A below), a true differential probe typically gives the highest performance, providing high CMRR, broad frequency range, and minimal time skew between inputs. For high-voltage floating applications, see the High Voltage Probes.
The preamplifier is perfect for low frequency differential measurements.