b. To uncouple the channel stimulus so that the channel power will be uncoupled, press:

7.

8.

9.

This will allow you to separately increase the power for channel 2 and channel 1, so that you can observe the gain compression on channel 2 while channel 1 remains unchanged.

c. ‘lb display the ratio of channel 2 data to channel 1 data on the channel 2 display, press:

This produces a trace that represents gain compression only.

~~~~and position the marker at appro~ately mid-sp~.

...........................................................

::

..........

/

@ @ to change the scale to 1 dB per division.

press (Scale3

i ;..:

 

10.Increase the power until you observe approximately 1 dB of compression on channel 2, using the step keys or the front panel knob.

11.To locate the worst case point on the trace, press:

log MRG

1 8 dB/ REF 0 dB

1 1 9 . 7 2 3 dB

PRm

CT

PRm

CT

 

 

 

I

I

 

I

I

I

I

I

I

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHZ STfiRT

1.000

000

MHz

 

S T O P 1 000. 000 000 MHz

 

. . . . . .................,..,

.......

............;....,.,.,.,.,.,.,.,.,;;.;...

was s&x&&, recouple the channel stimulus by pressing:

12. If :~~~~~~~~~~~:

:;,,.~.; .....t.... +...i.:.,.........: .. .::. .

A?:::<. . . >>

:...::z.......:..........i. . . .

 

13. lb place the marker eax.ct& on a measurement point, press:

2-56 Making Measurements

Page 107
Image 107
HP 8753E manual @ @ to change the scale to 1 dB per division, Lb place the marker eax.ct& on a measurement point, press