10. Residual FM, HP 8591EM

Measuring the Residual FM

7. On the EMC analyzer, press:

4MKR5 More 1 of 3 MARKER ALL OFF

4MKR !5 MKR ! HIGH

More 1 of 3 More 2 of 3 MARKER 1

8.Rotate the knob counterclockwise until the MKR-1 amplitude reads 03 dB 60.1 dB.

9.On the EMC analyzer, press the following keys:

4MKR5 MARKER NORMAL

4MKR !5 MARKER !CF

4SGL SWP5

4BW5 AVG BW AUTO MAN (MAN) 1 4kHz5

 

4

SPAN

5 0 4

Hz

5

 

 

 

 

 

 

 

4SWEEP/TRIG5 100 4

 

5

 

 

 

 

 

ms

 

4SGL SWP5

 

 

 

 

 

 

 

 

 

Note

 

 

 

The displayed trace should be about three divisions

 

 

 

 

below the reference level. If it is not, press 4

SWEEP/TRIG

5,

 

 

 

 

SWEEP CONT SGL (CONT), 4

 

5, and use the knob

 

 

 

 

FREQUENCY

 

 

 

 

to place the displayed trace about three divisions below the

 

 

 

 

reference level. Press 4SGL SWP5.

 

 

 

 

 

 

 

 

 

 

 

 

10.On the EMC analyzer, press 4MKR !5, MORE 1 of 3 , MARKER !PK-PK . Read the MKR-1 amplitude, take its absolute value, and record the result as the Deviation.

Deviation dB

11.Calculate the Residual FM by multiplying the Slope recorded in step 6 by the Deviation recorded in step 10.

Record this value as TR Entry 1 of the performance veri￿cation test record. The residual FM should be less than 250 Hz.

Continue with \Part 2: Narrow Bandwidth Residual FM."

Performance Veri￿cation Tests 2-47