HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

TO1
Third-Order Intermodulation Measurement
Turns on or off the third-order inter-modulation (TOI) measurement.
Syntax
Equivalent Softkey: TO1 ClN OFF .
Related Commands: AUNITS, MKPX, TH, TOIR.
Example
OUTPUT 718*"MOV TO1 1."
, , ,
OUTPUT 718*"TOIR'."
f - ,
ENTER 718;Toi
PRINT 'Third-order intermodulation is ",Toi
OUTPUT 718;"MOV TOI,O;"
Description
Tums on the third-order intemnodul&ion
measurement.
Queries TOIR. TOIR contains the results
of the third-order intermdulation
measurement.
Stores the value of TOIR in the variable
lbi.
Prints the results.
Turns off the third-order interrnodul&ion
measurement.
Setting TO1 to 1 turns on the third-order intermodulation measurement. Setting TO1 to 0 turns
off the third-order intermodulation measurement. When the third-order intermodulation
measurement is turned on, the spectrum analyzer first determines that there are four signals
on the spectrum analyzer display; the four signals must be the two fundamental signals and
two distortion products. All of the signals must be greater than the peak excursion above
the threshold. If four valid signals could not be found for the third-order intermodulation
measurement, the value of TOIR is -100. If four valid signals could be found, the spectrum
analyzer does the following:
1. Finds the four highest on-screen signals. (If the four highest on-screen signals are not the
two signals and two distortion products, the TO1 measurement cannot be performed.)
2. Determines the spacing between the highest two signals. The highest two signals are tone A
and tone B.
3. Verifies that the third and fourth highest signals (distortion A and distortion B) fall above
and below tone A and tone B by the frequency difference between tone A and tone B.
5-555 Programming Commands