Making Measurements Using Spectrum Analyzer Mode

Third Order Intermodulation Measurement (TOI)

 

 

RF iF

48.8

dBmV

#AT

40 dB

I

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PEAK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOG

 

TO1

 

72.

1 dB

V

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

dB/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N dB

PTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

%

AM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TO1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

OFF

 

WA

SE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SC

FS

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

COAR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Menu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FFT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I

CENTER 300.500

MHZ

 

 

 

 

SPAN

5.000

MHZ

 

 

 

 

 

 

 

 

 

 

XRES

EW 3.0

kHz

 

VBW 3 kHZ

 

SWP

1.67

set

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5-34. Third-Order Intermodulation Measurement

Example: Use the TO1 function to make a measurement.

1.Press [PRESET). Connect two equal amplitude signals with different frequencies, to the spectrum analyzer’s INPUT 75 Q.

2.Press [FREQUENCY) and enter the frequency of one of your input signals to place the signal at the spectrum-analyzer center frequency.

3.Press (SPANI. Change the span until only the two signals and their two distortion products appear on the display.

4.Press I-1 and TO1 ON OFF (ON) to activate the third order intercept measurement function.

5.Read the measurement results in the upper left corner of the screen.

6.Press TO1 ON OFF (OFF) to turn the measurement off.

5-65