Keysight Agilent U1818B Active Differential Probe with 100 kHz to 12 GHz Range, Low Noise Floor, and Flat Frequency Response

The Keysight U1818B 100 kHz to 12 GHz active differential probe makes it easy to perform high frequency in-circuit measurements using network, spectrum and signal source analyzers. With flat frequency response, low noise floor, and direct power from instrument connection, the U1818B allows measurements to be made while taking full advantage of Keysight's RF analyzers dynamic range.

• Broad bandwidth with flat frequency, +/- 1.5 dB, which ensures excellent measurement accuracy and helps users achieve the best product specifications
• Low noise floor, less than -130 dBm/Hz at 10 MHz to 12 GHz, which allows measurements to be made at a low signal amplitude
• Convenience biasing from Keysight's RF and microwave instruments probe power port or bench top power supply for user flexibility

Using a Network Analyzer with Active Differential Probes: Below is an application showing the U1818A/B with a network analyzer measuring step response in a high-speed digital design. In this application, the network analyzer provides the signal at one end while the active differential probe is used to measure the insertion loss between the DUT at the other end. The network analyzer will automatically transform the output signal from frequency domain to time domain for the frequency sweep selected. After the conversion of the signal, you will be able to identify the rise time, fall time or overshoot values which is essential in verifying the PCB design. The in-circuit measurement method of using the active differential probe with a network analyzer will provide accurate measurements with bigger dynamic range.

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