Table 4-14 Analog/Digital/Bluetooth Analyzer > Functions > Smpte Imd Menu - Keysight U8903B User Manual

4 Audio Analyzer Measurement Functions
Table 4-14 Analog/Digital/Bluetooth Analyzer > Functions > SMPTE IMD menu description
Menu Description
Press the Unit softkey to select the measurement unit.
– dB
Unit – ΔdB
– %
– x
Press the Format softkey to select the format of the returned measurement reading.
– Off
Selecting Off will return the measurement reading without any formatting (raw value).
– Delta
Format
Selecting Delta will return the measurement result by deducting the reference ratio from the measured ratio. The result
will be returned in unit ΔdB.
– Linear
Selecting Linear will return the measurement result by dividing the measured ratio by the reference ratio. The result is
returned in unit x.
This is only available for the analog analyzer.
Set to 0dB
Press the Set to 0dB softkey to store the measured ratio as the reference ratio, and set the measurement reading format to
Delta.
Set resul t as ref. from Press the Set resul t as ref. from softkey to store the measurement result from the selected channel as the reference ratio.
Ref. Ratio Press the Ref. Ratio softkey to set the reference ratio.
This is only available for the analog and Bluetooth analyzer.
Press the Freq Lock softkey to select the searching method for the upper and lower frequencies.
– Gen Lock
Selecting Gen Lock will allow the U8903B to search for the upper and lower frequencies of the input signal based on the
upper and lower frequencies of the respective generator channel. You can select the generator channel by setting the
Freq Lock
Src Channel in the Meas. Config. menu page. This Gen Lock method is only useful if you use the internal audio
generator.
– Custom
If you have a known input signal, you can define the upper and lower frequency values by setting the searching method
to Custom and setting the frequency value in Upper Freq and Lower Freq.
Press the Upper Freq softkey to set the upper frequency value. This setting is only available when Freq Lock is set to
Upper Freq
Custom.
Press the Lower Freq softkey to set the lower frequency value. This setting is only available when Freq Lock is set to
Lower Freq
Custom.
212 Keysight U8903B User's Guide