Typical specifications for frequency discriminators include frequency accuracy within the linear bandwidth (expressed as a percent of deviation from a best-fit straight line), crossover accuracy and demodulated video bandwidth.
Frequency accuracy (commonly known as linearity) measurement is achieved using a computer-controlled RF generator, which is step incremented through the specified linear frequency range, and a digital multimeter to record the video output voltage. The result is a plot of measured output voltage, corresponding to input frequency and its deviation from a best-fit straight line using a linear regression formula.
In many instances, the demodulated video bandwidth can be approximated. This is achieved by dividing 0.35 by the measured video rise time. Alternatively, a more appropriate form of measurement is to modulate the carrier with a suitably wide baseband signal and use a spectrum analyzer to display the modulated video output. The -3 dB point of baseband signal can then be measured directly.
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