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SR1 Operation
163
© 2014 Stanford Research Systems
SMPTE/DIN (f1 = low frequency, f2 = high frequency,
U2 = amplitude of high freq. component)
d2
d2 = (U
f 2+f 1
+ U
f 2-f 1
)/U2
d2+d3
d3 = (U
f 2+2*f 1
+ U
f 2-2*f 1
)/U2
d2+d3+d4
d4 = (U
f 2+3*f 1
+ U
f 2-3*f 1
)/U2
CCIF/DFD (fc = center frequency, fd = difference
frequency, U = average power of fundamental
components)
d
d,2
d
d,2
= U
f d/U
d
d,2
+ d
d,3
d
d,3
= (U
f c+1.5f d
+ U
f c-1.5f d
) / U
DIM/TIM (fs = Sine Frequency ~15 kHz, fq = Square
Freq. ~ 3.15 kHz)
U
5
U
5
=
U
5f q-f s
/ U
U
5
+U
4
U
4
=
U
f s-4f q
/ U
Note that the listed distortion products are not the complete set of distortion products for each type of
measurement. For instance, in the CCIF/DFD measurment there is a second order distortion product at
the sum of the input frequencies as well as the difference. However the listed distortion products
represent the ones typically measured for each type of IMD measurement.
Averaging
The IMD analyzer implements a user-selectable tradeoff between measurement speed and measurement
precision. Internally this is accomplished by varying both the number of FFT averages performed and the
resolution of the FFT spectra. When using the precise and very precise settings measurements will be
noticeably slower, but the measurement results will exhibit less variability. Pressing "Clear" clears the
average buffer and is useful for eliminating the transients caused, for example, by switching input ranges.
Summary of Contents for SR1
Page 5: ...Part I Getting Started Audio...
Page 7: ...Getting Started 7 2014 Stanford Research Systems...
Page 12: ...SR1 Operation Manual 12 2014 Stanford Research Systems...
Page 27: ...Part II SR1 Operation Audio...
Page 258: ...SR1 Operation Manual 258 2014 Stanford Research Systems...
Page 272: ...SR1 Operation Manual 272 2014 Stanford Research Systems on the amplitude sweep...
Page 289: ...SR1 Operation 289 2014 Stanford Research Systems...
Page 290: ...Part III SR1 Reference Audio...