77
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 upper corner of the option.
