The HP 8971B Noise Figure Test Set is an integral part of the HP 8970S Noise Figure Test System. It is used to extend the frequency range of the HP Noise Figure Meter. If the signal under test is above 1600 MHz, the Test Set down-converts it to an intermediate frequency (IF). The IF signal has noise characteristics virtually identical to the input signal, and is routed to the HP 8970B for noise figure measurement.
