A tracking source combined with a host spectrum analyzer allows you to measure the swept amplitude response of a device, such as an amplifier or a filter. These measurements have the advantage of high dynamic range and speed. In addition, since the spectrum analyzer is a tuned receiver, measurements are not affected by spurious signals or harmonics.
The HP 85644A tracking source is ac coupled. The frequency range is from 300 kHz to 6.5 GHz with selectable RF output power.
The HP 85645A tracking source allows you to choose ac or dc coupling. The frequency range is from 300 kHz to 26.5 GHz with selectable RF output power.
The tracking sources can easily be congured to track the input frequency of a variety of spectrum analyzers or the output frequency of a microwave sweep oscillator. A conguration menu, accessible at the press of a front-panel key or via HP-IB, allows you to choose from among the following compatible host instruments:
– HP 8560 Series portable spectrum analyzers.
– HP 8566A/B spectrum analyzers.
– HP 8590 Series portable spectrum analyzers.
– HP 8340A/B synthesized sweepers.
– HP 8350 Series sweep oscillators .
The tracking sources have offset tracking capability. Offset tracking makes possible the amplitude response measurements of many frequency translation devices (such as mixers), and of systems with delays (such as satellite links). The advantage of the host spectrum analyzer (a tuned receiver) minimizes the effects of other mixing products.
With two tracking sources set to appropriate offset frequencies, swept TOI (third-order-intercept) measurements are possible over a continuous range of frequencies. The time required for the swept TOI measurement is minimal.
The tracking source also offers power sweep capability. Power sweep is useful for characterizing saturation effects of devices under test.
The tracking sources can generate stand-alone, CW signals at fixed, non-synthesized, frequencies of your choosing. No connections to a host instrument are required. The CW signal from the tracking source can be used, along with a host spectrum analyzer, for measuring harmonics generated by a device such as an amplifier.
The tracking source combined with a transducer can make swept measurements of circuit immunity to electromagnetic interference.