11. Open the ZAUTO utility and perform a calibration:
a. Begin at +10-dBm and decrease the SIGGEN power by 10 dB for each sample.
b. At the saturation point and noise floor use 1 dB steps to carefully define the roll-os.
c. Select the lower and upper bounds of the linear portion of the receiver.
d. Select FIT.
e. Turn o the SIGGEN RF output and select NOISE.
f. Verify that the receiver dynamic range is greater than or equal to 95 dB.
g. Check that the signal generator frequency has not drifted by looking at the plot.
h. If it is
o by more than 0.1 MHz, retune and repeat the test.
12. In the dspx utility, put RVP900 back in automatic AFC control by typing the ps
command and pressing =.
13. Record RVP900 calibration values.
Checklist
Table 107 Calibration and Dynamic Checklist
Task Checked OK/Not OK Remarks
Test procedure completed successfully.
Parameters are set.
See 6.7 Pr — Plot Receiver Waveforms (page 155).
Test Passed
For Customer Date:
For Vaisala Date:
A.23 Checking Receiver Bandwidth
Test Goal
Verify the receiver bandwidth is in excess of 14 MHz.
Background
For proper functioning of the high speed A/D convertors, RVP requires approximately 14
MHz of broadband noise.
This noise does not interfere with the signal to noise ratio because the bandwidth
filter is
applied afterwards. The bandwidth of the anti-aliasing
filter should be the limiting factor.
This test uses the same hookup as A.22 Checking Calibration and Dynamic Range
(page 362).
For dual polarization systems, you can expect a narrower bandwidth.
Appendix A – Installation and Test Procedures
363
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