39. Displayed Average Noise Level, HP 8591EM

1 MHz

10. Press the following EMC analyzer keys:

4FREQUENCY5 1 4MHz5

4SGL SWP5

Wait for the completion of a new sweep.

11. Press the following EMC analyzer keys:

4DISPLAY5 DSP LINE ON OFF (ON)

Adjust the display line so that it is centered on the average trace noise, ignoring any residual responses (refer to the Residual Responses veri￿cation test for any suspect residuals).

12.Record the display line amplitude setting as TR Entry 2 of the performance veri￿cation test record as the noise level at 1 MHz. The average noise level should be less than the speci￿ed limit.

1 MHz to 1.5 GHz

13. Press the following EMC analyzer keys:

4FREQUENCY5 START FREQ 1 4MHz5 STOP FREQ 1.5 4GHz5

4BW5 1 4MHz5

AVG BW AUTO MAN (MAN) 10 4kHz5

4SWEEP/TRIG5 SWEEP CONT SGL (CONT)

If the IF overload message is displayed on the EMC analyzer, performing the next step should clear the message.

14.Press 4FREQUENCY5 and adjust the center frequency setting, if necessary, to place the LO feedthrough just o￿-screen to the left.

15.Press the following EMC analyzer keys:

4SGL SWP5

4TRACE5 CLEAR WRITE A

More 1 of 4 More 2 of 4 VID AVG ON OFF (ON) 10 4Hz5

Wait until AVG 10 is displayed to the left of the graticule (the EMC analyzer will take ten sweeps, then stop).

2-268 Performance Veri￿cation Tests