Vaisala RVP900 - Digital AFC (DAFC) Alignment (Optional); Table 102 Bandwidth Filter Setup Checklist

Test Procedure
1. Enter the TTY setups through dspx.
2. Issue the Ps command and view the results on the display scope.
3. Toggle the space bar to show both the spectrum of the burst pulse and the spectrum of
the bandwidth filter response.
4. Use the Z/z command to zoom the burst spectrum plot to approximately match the
height of the bandwidth filter response (which have a smoother shape than the burst
pulse).
5. Use the Ww/Nn commands to adjust the width of the bandwidth
filter plot to be slightly
narrower than the burst pulse. Then use the w/n commands to fine tune the filter width
such that the DC–Gain: is either ZERO or less than -66 dB.
6. Repeat for each pulse width that is used (use the Mt command to change pulse width)
and record:
Pulse width #
FIRLength Bandwidth DC Gain
0 ________ μsec ________ MHz ________ dBm
1 ________ μsec ________ MHz ________ dBm
2 ________ μsec ________ MHz ________ dBm
3 ________ μsec ________ MHz ________ dBm
Checklist
Table 102 Bandwidth Filter Setup Checklist
Task Checked OK/Not OK Remarks
Test procedure completed successfully.
Parameters are set.
See 6.6 Ps — Plot Burst Spectra and AFC (page 137).
Test Passed
For Customer Date:
For Vaisala Date:
A.18 Digital AFC (DAFC) Alignment
(Optional)
Test Goal
Verify that RVP900 DAFC output controls the STALO over the correct span.
RVP900 User Guide M211322EN-J
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