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166
THD+N=10log
10
(
THD+N
V
f
)
Spurious-free Dynamic Range (SFDR) - the ratio of the amplitude of the
highest peak in the spectrum to that of the second highest peak
SINAD – signal to noise and distortion ratio. The ratio (in decibels) of the
signal-plus-noise-plus-distortion to noise-plus-distortion
SINAD=10log
10
(
Signal
Noise+noise
)
Signal Noise Ratio (SNR) – the ratio (in decibels) of average signal power to
average noise power
SINAD=10log
10
(
Signal
Noise
)
Inter-modulation Distortion (IMD) - a measure of distortion due to non-linear
mixing of two tones
IMD=
√
F
3
2
+F
4
2
F
1
2
+F
2
2
To set the measurements
1. Tap the Measurement button at the bottom of the screen to open the
measurement dialog box.
2. Select the channel to be measured.
3. Select the appropriate measurement options. The Whole Track and Ruler
Track can be toggled through the Edit icon in the lower corner of the option.
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