7 Test Sequence Application
324 Keysight U8903B User’s Guide
Signal analysis
The SNR signal analysis settings menu page is displayed as shown in Figure 7-24.
Figure 7-24 SNR > Signal Analysis settings menu page
Table 7-23 SNR > Signal Analysis settings menu description
Menu Description
SNR Mode
Press the SNR Mode softkey to select the SNR measurement mode.
–Fast
The SNR measurement is based on the frequency domain computation method.
– Standard
The SNR measurement is measured by an internal routine that alternatively switches the U8903B generator output on
and off. This mode is a closed-loop configuration which requires both the generator and analyzer in the test setup.
SNR Delay Press the SNR Delay softkey to set the SNR delay. This setting is only available when SNR Mode is set to Standard.
Freq Lock
Press the Freq Lock softkey to select the searching method for the fundamental frequency. This setting is only available
when SNR Mode is set to Fast.
–Auto
Selecting Auto will allow the U8903B to search for the fundamental frequency automatically.
– Gen Lock
Selecting Gen Lock will allow the U8903B to search for the fundamental frequency based on the generator frequency
value of the respective generator channel. 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 fundamental frequency value by setting the searching method to
Custom and setting the frequency value in Fund Freq.
Fund Freq
Press the Fund Freq softkey to set the fundamental frequency value. This setting is only available when SNR Mode is set to
Fast and Freq Lock is set to Custom.
Harmonic Cnt
Press the Harmonic Cnt softkey to set the number of harmonic order to be removed. This setting is ony available when SNR
Mode is set to Fast.
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