87405B Preamplifier 10 MHz to 4 GHz

Benchtop/General Purpose Use

Used alone on the bench, the Keysight Technologies, Inc. 87405B Preamplifier can be added to any application in which additional gain and low noise are required. The Keysight 87405B preamplifier brings reliable gain and low noise figure to measurement systems to improve overall system perfor mance and reduce systematic errors. With its compact and portable size, this preamplifier can be powered directly from the instrument’s probe-port which eliminates the need for a separate power supply and makes it an excellent choice for use in the field. The 87405B is designed for use with a variety of Keysight instruments such as the PSA, ESA, and MXA spectrum analyzers. The 87405B is the recommended preamplifier for use with the 8594E noise figure measure ment solution. The rugged Type-N connectors stand up to the multiple connect and disconnects needed in field applications for reliable, repeatable measurements.

Improve Noise Figure Measurements

Add a preamplifier to noise figure measurement systems to significantly lower system noise figure. The noise figure of the system is dominated by the noise figure of the preamplifier.

For systems having a single preamplifier, where the gain of the preamplifier is greater than or equal to the spectrum analyzer noise figure, the system noise figure approximately equals the noise figure of the pre-amplifier.

Increase Sensitivity and Speed

Adding preamplifiers to measurement systems can improve sensitivity for measuring low-level signals. Boost the sensitivity of your Keysight spectrum analyzer 15 to 25 dB by using the 87405B preamplifier. Alternatively, better sensitivity can be traded for measurement speed. Spurious tests often require narrow resolution bandwidths to reduce the noise floor of the analyzer, allowing low-level signal detection. An analyzer with low noise figure allows you to use a wider resolution bandwidth, yet achieve the same sensitivity. Sweep times can improve one hundred times for each decade increase in band width. The 87405B preamplifier has gain and noise figure characteristics that optimize dynamic range and sensitivity.