Tektronix RSA306 Technical Reference

Performance ver
ification
9. Calculate and record the Image Spur Amplitude in dBc (Image amplitude (dBm) + 30).
10. Repeat steps 6 through 9 for each center frequency listed in the table.
11. Record results in the Test record.
NOTE. The inte
nt of the image spurious test is to measure spurious responses caused by the injection of 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 signal to induce a corresponding change in the displayed
frequency of
the image spur.
Change the in
put frequency in steps that allow the product to stay within the on-screen frequency s pan. 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 s pecification are 1:1 images and they will move either –1:1 or + 1:1 with changes in input
signal fre
quency.
Never disc
ount 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 Signal 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 signal analyzer terminated in 50 Ω.
Residual
spurs are subject to separate specification limits.
Table 18: First converter images: RSA306 and signal generator settings
Center frequency
(RSA306)
Image frequency
(signal generator)
Image Amplitude at
RSA306 CF, dBm
Image Spur
Amplitude, dBc
1
Specific
ation, dBc
(relative to –30 dBm
input)
22 MHz 4902 MH
z
< –50 dB
c
690 MHz 5570 MHz < –50 dBc
700 MHz 5580 MHz < –50 dBc
1320 M
Hz
6200 M
Hz
< –50 d
Bc
1850 MHz 4230 MHz < –50 dBc
2690 MHz 5070 MHz < –50 dBc
2700
MHz
5080
MHz
< –50
dBc
3690 MHz 6070 MHz < –50 dBc
4200 MHz 680 MHz < –50 dBc
475
0MHz
237
0MHz
<–5
0 dBc
4950 MHz 2570 MHz < –50 dBc
4960 MHz 2580 MHz < –50 dBc
57
00 MHz
33
20 MHz
<–
50 dBc
6200 MHz 3820 MHz < –50 dBc
1
Image amplitude + 30.
RSA306 Specifications and Performance Verification 42

Tektronix RSA306 Specifications

General

Brand	Tektronix
Model	RSA306
Category	Measuring Instruments
Language	English