Period, sec 
22.80 
19.08 
16.48 
14.47 
12.40 
10.40 
10.26 
8.81 
Uodi/ 
6.45 
5.40 
4.33 
21.84 
17.94 
14.34 
12.09 
10.26 
10.18 
8.69 
(eres; 
Bo tT 
4 40 
6. 
0439 
.0524 
.0607 
0691 
. 0806 
.0962 
.0975 
6 WIS 
. 1321 
aIp90 
. 1852 
.2309 
SOLOISTS. O BOLO OVOVOr© 
-0458 
-0557 
.0697 
.0827 
-0975 
.0982 
6 IS 
. 1383 
IS, 
oCATS) 
GOOO00 OO000 
Frequency, Hz 
Table A4 
Waverider 66968 Errors (Proportion) for Calibrations 
on 26 August 1981 and 31 August 1982 
26 August 1981 
-0. 
.0062 
-0 
-0. 
0. 
-O. 
0002 
.0009 
0022 
. 0047 
0059 
0064 
0132 
0111 
0028 
0002 
0043 
31 August 1982 
-O. 
-0. 
.0005 
0025 
.0030 
0022 
.0016 
.0006 
. 0006 
0133 
0115 
0056 
Datawell-Predicted 
Difference Error d Error DW 
-0. 1230 
-0.0664 
-0.0386 
-0.0235 
-0.0129 
-0.0064 
-0.0061 
-0.0033 
-0.0018 
-0.0010 
-0.0005 
-0.0002 
-0. 1066 
-0.0530 
-0.0227 
-0.0117 
-0.0061 
-0.0059 
-0.0032 
-0.0015 
-0.0006 
-0.0002 
Recently, Datawell has been working on this sensitivity-drift prob- 
lem, and an improved modulator printed-circuit board has been made available 
for bringing calibrations within specification and for preventing further 
This modification was made for buoy 66968 and 66966 
decrease in sensitivity. 
so the temperature-related error correction need not be applied. For buoy 
66967, however, it is recommended that the correction be used. Datawell has 
provided curves for correction of the calibration based on buoy temperature 
when the buoy is measuring waves in the ocean. 
The NOAA Engineering Support 
Office has developed a table based on the Datawell curve which can be entered 
with the uncorrected difference error value d and the temperature of the 
A6 
