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TO1 Third-Order Intermodulation Measurement
4. Measures the levels of the four signals (tone A, tone B, distortion A, and distortion B) and
calculates the third-order intermodulation intercept.
The third-order intermodulation intercept is calculated as follows:
TOI
=
(2
x
LevelTone
A
-
Leve~Di~tortion
A
+
LeVelTone
B)
2
The frequency of the distortion product (Distortion A) is equal to the following:
Frequewm8tortion
A
=
2
X
FrequencYTone
A
-
FreqwwTone
B
You must query TOIR to determine the value of the higher third-order intermodulation product.
The third-order intermodulation measurement is repeated at the end of every sweep
(TO1
uses the ONEOS command to update the measurement data) until you turn off the third-order
intermodulation measurement.
Restrictions
Turning the TO1 measurement on turns off the following functions: windows display mode
(WINON),
N
dB
point measurement (NDBPNT), the FFT menu measurements (FF’IAUTO,
FFTCONTS,
FFTSNGLS),
gate utility functions (GDRVUTIL), marker table (MKTBL), peak table
(PKTBL), percent AM (PCTAM), peak zoom (PKZOOM), and power menu measurements (ACP,
ACPE, CHP, and OBW).
You can execute the
TO1
command two different ways. You can either execute the
TO1
command directly (for example,
“TO1
1;
I’)
or use the MOV command to move the 1 or 0 into
the TO1 command (for example,
“MOV
TOI,
1;
I’).
If you use the MOV command, no text is
displayed in the active function area during command execution.
Because
TO1
is performed at the end of every measurement sweep, you should turn off
the third-order intermodulation measurement (set
TO1
to 0) when you are done with the
third-order intermodulation measurement.
Query Response
r
Off
7
0
output
’
termination
+
QTO I
Programming Commands
5-557