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NI PXIe-5611 Calibration Procedure
16
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Sweep time: 5 ms
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Reference clock source: External
6.
Calculate the ISR according to the following formula and save the
values:
ISR
=
Measured Image Power
–
Measured RF Output Power
7.
Repeat steps 3 through 6 for every offset frequency from –50 MHz to
+50 MHz in 5 MHz increments while keeping the LO frequency fixed.
Tip
Set the NI-RFSG Generation Mode property to
CW
to generate a 0 Hz offset. The ISR
with a 0 Hz frequency offset cannot be measured, and the 0 Hz data point can be ignored.
8.
Calculate the relative modulation bandwidth flatness by subtracting
the RF output power measured at 0 Hz offset from the RF output
powers measured at each of the other offset frequencies.
9.
Compare each value calculated in step 8 to the limits in Table 6 and
compare only the ISR values calculated for offset frequencies between
–10 MHz and 10 MHz in step 5 to the limits in Table 7.
Note
Values calculated for offset frequencies less than –10 MHz and greater than 10 MHz
are not specified and do not have test limits.
10. Repeat steps 3 through 9 for each LO frequency in Table 6.
Table 6.
Modulation Bandwidth Impairment Verification Test Limits
LO Frequency
(GHz)
Modulation Bandwidth Test Limits (dB)
Maximum
Minimum
0.2
3
–3
2.4
3
–3
4.0
3
–3
5.8
3
–3