UM-0085-B09
DT80 Range User Manual
Page 81
RG
The rainflow report provides a complete summary of the rainflow data for the collection period. The cycle size range for
each class, the number of cycles in each class, and the mean for each class is shown, as well as the summary data.
Although the rainflow report cannot be logged in the DT80, the primary cycle count data used to make up the rainflow
report can. For example, the program
BEGIN"Rainflow"
RA50T 2BGI(RAINFLOW:72:5:1..27IV,W)
RB7D 1..27IV
LOGONB
END
logs the histogram data every 7 days. Reports can be created manually after download of the primary cycle count data.
Example — Rainflow Cycle Counting
Capture raw strain gauge data and perform rainflow cycle analysis using the program
BEGIN
RA50T 1BGI(RAINFLOW:1000:5:101..127IV,W)
END
This instructs the DT80 to
•
collect current-excited bridge data (1BGI) every 50ms (RA50T) and carry out rainflow analysis over the range of
zero to 1000 ppm
•
apply a 5% rejection (that is, cycles smaller than 50ppm are rejected)
•
accumulate cycles into histogram variables 101 through 127 (101..127); this gives 20 cycle size classes for
cycle counts, and 7 others for summary information.
The matching rainflow report command
RAINFLOW:1000:5:101..127IV
can then be used to return a summary report.
