HP Cable Box 8591C manual Third-Order Intermodulation Measurement

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.

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