Tektronix RSA6100A Technical Reference page 105

RSA6100A Series Technical Reference
Table 72: Image Suppression Settings — RSA6120A (cont.)
RSA6100A Center Frequency
18 GHz
19.5 GHz
5. For each row of the above table (as appropriate to your instrument model):
a. Set the RSA6100A to the Center Frequency shown in the first column.
b. Set the RF generator output frequency to the Image Frequency shown in
the second column.
c. Read the signal amplitude, in dBm, at center screen. Subtract -30 dBm
from the signal amplitude, to convert it to dBc.
d. Enter this value in the test record.
NOTE. The intent of the image spurious test is to measure spurious responses
caused by the injection an external signal that would induce an image product
on the display. These images can be the same frequencies as residual spurs. In
case of question, slightly change the frequency of the input tone to induce a
corresponding change in the displayed frequency of the image spur. Change
the input frequency in steps that allow the product to stay within the on-screen
frequency span. If the on-screen spur does not move in response to the input signal
change, it is not an image and is not covered in the image spurious specification.
Some care must be taken in noting the frequency change. The images specified in
the specification are 1:1 images and they will move -1:1 with changes in input
signal frequency. Never discount the possibility that a spur in question could be
coming from the test signal generator. Such spurious responses can also move
with changes in signal generator frequency. In case of question, validate the
performance of the generator with a different spectrum analyzer and/or filter the
signal from the test generator to remove unwanted products.
If the spur seen on screen is a residual, it will still be present with the input
to the spectrum analyzer terminated in 50 ohms. Residual spurs are subject to
separate specification limits.
Performance Verification
RF Generator Output Frequency (Image)
8 GHz
9.5 GHz
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