29. Spurious Response, HP 8591EM

10.If necessary, adjust the EMC analyzer center frequency until the two signals are centered on the display, then set the EMC analyzer by pressing the following keys:

4BW5 3 4kHz5

AVG BW AUTO MAN (MAN) 300 4Hz5

11.Press 4MKR !5, MARKER ! HIGH , then press 4DISPLAY5, DSP LINE ON OFF

(ON). Set the display line to a value 54 dB below the current reference level setting.

The third order intermodulation distortion products should appear 50 kHz below the lower frequency signal and 50 kHz above the higher frequency signal. Their amplitude should be less than the display line. See Figure 2-40.

Figure 2-40. Third Order Intermodulation Distortion, HP 8591EM

Performance Veri￿cation Tests 2-185