TO1
Third order intermodulation distortion occurs in a system where two signals are present. The distortion products are a result of each signal mixing with the other’s second harmonic. If the two main signals are of equal power, the two third order distortion products will also be of equal power. As the power of the two main signals is increased by an equal amount, the power of the distortion products will increase three times that amount. Theoretically, there is a power level at which the power of each distortion product equals the power of the two main signals. (Practically, it may not be possible to reach this power level because of compression or limiting.) The Third Order Intercept (TOI) is deEned as the power at which the third order distortion products equals the power of two equal level test signals.
trace
A trace is made up of a series of data points containing frequency and amplitude information. The series of data points is often referred to as an array. Traces A, B, and C are the typical names of traces that analyzer displays. The number of traces is speciEc to the instrument.
units
Dimensions on the measured quantities. Units usually refer to amplitude quantities because they can be changed. In analyzers with microprocessors, available units are dBm (dB relative to 1 mW (milliwatt) dissipated in the nominal input impedance of the analyzer), dBmV (dB relative to 1 mV (millivolt)), dBpV (dB relative to 1 pV>, volts, and in some analyzers watts.
update
To make existing information current; to bring information up to date
upgrade
To improve the quality or extend the capability of an instrument or product. Enhancements to upgrade the product. These enhancements can then be documented in an update package.
variable persistence
A property of the display that allows the adjustment of the
