10. Residual FM, HP 8591EM

Part 1: Residual FM

Determining the IF Filter Slope

1.Connect the equipment as shown in Figure 2-13.

2.Set the signal generator controls as follows:

FREQUENCY ::: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: : 500 MHz

CW OUTPUT :: :: :: :: :: ::: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: 010 dBm

3.Press 4PRESET5 on the EMC analyzer, then wait for the preset routine to ￿nish. Set the EMC analyzer by pressing the following keys:

4FREQUENCY5 500 4MHz5

4SPAN5 1 4MHz5

4AMPLITUDE5 98 4dB￿V5

SCALE LOG LIN (LOG) 1 4dB5

4BW5 1 4kHz5

4MKR !5 MKR ! HIGH

4MKR5 More 1 of 3 MK TRACK ON OFF (ON)

4SPAN5 10 4kHz5

4.Wait for the AUTO ZOOM message to disappear, then press the following EMC analyzer keys:

4MKR !5 More 1 of 3 MARKER !REF LVL

4MKR5 MARKER 1 ON OFF (OFF)

4SGL SWP5

4MKR !5 MKR ! HIGH More 1 of 3 More 2 of 3 MARKER 1

If you have di￿culty achieving the 60.1 dB setting, then make the following EMC analyzer settings:

4SPAN5 5 4kHz5

4BW5 AVG BW AUTO MAN (MAN) 30 4Hz5

5.Rotate the EMC analyzer knob counterclockwise until the MKR-1

amplitude reads 01 dB 60.1 dB. Press 4MKR5, MARKER 1 . Rotate the knob counterclockwise until the MKR-1 amplitude reads 04 dB 60.1 dB.

Performance Veri￿cation Tests 2-45