Smpte Imd Measurements; Figure 4-33 Analog Analyzer > Functions > Smpte Imd Menu - Keysight U8903B User Manual

4 Audio Analyzer Measurement Functions

SMPTE IMD measurements

The SMPTE IMD function provides a measure of the second and third order intermodulation
distortion introduced by the DUT by injecting two pure tones (tone 1 and tone 2, where
tone 1 is at a much lower frequency than tone 2, for example, 60 Hz and 7 kHz respectively)
into the DUT. SMPTE IMD is expressed in dB (default) or as a percentage.
If tone 1 = f1 and tone 2 = f2, the following harmonics are considered.
– f2 – f1
– f2 + f1
– f2 – 2f1
– f2 + 2f1
The SMPTE IMD value is computed as the ratio of the sum of the intermodulation
harmonics amplitude to the upper frequency tone amplitude. Refer to "Dual waveform" on
page
SMPTE IMD measurement function mode is applicable for the analog, digital, and
Bluetooth analyzer. The settings for SMPTE IMD measurement are displayed as shown in
Figure 4-33, Figure 4-34, and Figure 4-35 for the analog, digital, and Bluetooth analyzer
respectively.
Figure 4-33
210
106 for more information on generating dual tones for this measurement.
Analog Analyzer > Functions > SMPTE IMD menu page 1
Keysight U8903B User's Guide