Appendix C _____________________________________________ Installation and Test Procedures
VAISALA______________________________________________________________________ 381
Test Passed
C.16 Bandwidth Filter Adjustment
Test Goal
Set the band width filter for each pulse width.
Special Test Equipment
- KVM connected
Reference
-See Section 5.4 Ps — Plot Burst Spectra and AFC on page 148
Test Procedure
1. Enter the "Ps" command and view the results on the display scope.
Toggle the space bar to show both the spectrum of the burst pulse and
the spectrum of the bandwidth filter response. Use the Z/z command
to zoom the burst spectrum plot to approximately match the height of
the bandwidth filter response (which will have a smoother shape than
the burst pulse).
2. 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.
3. Repeat for each pulse width that is used (use the "Mt" command to
change pulse width) and record:
Test Passed
For Customer_________________________________ Date__________
For Vaisala___________________________________ Date__________
FIR Length Bandwidth DC Gain
Pulsewidth 0 __________usec __________MHz _________ dB
Pulsewidth 1 __________usec __________MHz _________ dB
Pulsewidth 2 __________usec __________MHz _________ dB
Pulsewidth 3 __________usec __________MHz _________ dB
For Customer_________________________________ Date__________
For Vaisala___________________________________ Date__________
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