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175
THD + N = 10log
10
( )
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 Ratio (SNR) — the ratio (in decibels) of average signal power
to average noise power
SINAD = 10log
10
(
Inter-modulation Distortion (IMD) — a measure of distortion due to non-
linear mixing of two tones
F
2
3
+ F
2
4
F
2
1
+ F
2
2
To set the measurement
1. Tap the Measurement button at the bottom of the screen to open the
measurement dialog box.
2. Select the channel to be measured.
IMD = √
)
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