Feature: T&M
Figure 1: Amplitude accuracy of a source across the frequency range
Figure 2: An example of amplitude specifi ed within a temperature range for a signal generator
Figure 3: Various non-ideal spectral components
frequency sweeping to test fi lters and power amplifi ers. Choosing a signal generator with a tighter amplitude frequency specifi cation provides a more uniform output across a frequency range. Figure 1 shows the fl atness of a signal generator when determining the amplitude accuracy across a group of frequencies.
Temperature range and amplitude accuracy Temperature is another factor that aff ects amplitude accuracy. Characterisation by a specifi c frequency and temperature range determines the accuracy of a device. Temperatures outside of this range cause an accuracy roll-off . If the signal generator’s ambient
temperature is outside the defi ned range, it is essential to check whether the temperature diff erence will aff ect the amplitude accuracy. Figure 2 is an example of temperature specifi cations of a
signal generator. T e footnote gives the temperature range and degradation for temperatures beyond that range.
Frequency accuracy Two key factors for understanding the accuracy for frequency generation are the stability of the reference oscillator and the time between source calibrations – also known as the ageing eff ect, or rate.
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