The Overall Equipment Effectiveness analysis (OEE) gives you detailed information about a test machines’ productivity based on performance, quality and availability. It calculates OEE metrics based on the availability of the stations, the performance as well as the quality.
To load the report, enter one or more station names or wildcard (*) in the report filter and click Apply filter to load the report.
A new parameters section is presented when you apply a filter. The values entered in this section are used in the OEE calculations.
With the Availability (hrs) parameter, you can specify for how many hours a machine is being available for testing per weekday (0 to 24 hours). Specifying 24 hours per weekday means the station is available 24/7. The available time is calculated per socket and capped by the From and To-date specified in the top filter.
Target output (reports)
With the Target output parameter, you can specify the number of reports a station is able to produce per hour. If the station has multiple sockets, this value will be divided by the number of identified sockets. Leave this parameter empty and WATS will calculate the target output by looking on the last 6 months production volume (daily average per station).
Min/Max connection /execution time
With the Min/Max connection/execution time parameters, you can cap results not being accurate. The parameters are prefilled with the results minimum and maximum values. Results outside the min/max values will be capped accordingly.
Connection and Execution time statistics
Connection and Execution time statistics are presented next to the Parameters section, listing the average and median connection and execution time for the complete result set.
Recalculating after modifying parameters
When modifying parameters, simply click the calculate button to update OEE calculations and statistics.
OEE Result grid
OEE calculations are presented to you in our new grid, and you can easily visualise the data of interest with help of the new column chooser.
Quality is measured by calculating the last pass yield (LPY, passed units divided by total number of units). See Last Pass Yield for details about the calculation. The LPY value will fall back to 100% in cases where we have multiple UUTs but none of them being produced for the first time in the process.
The unit count, lpy pass count and quality (lpy) are presented to you in the data grid.
The performance is computed by dividing the total number of produced UUTs by a target production output. If you leave the target output parameter empty, it is calculated from historical data from the previous six months. If there are no historical data available, the performance will fall back to 100%.
The Target output, target output per hour, test report count and performance are presented to you in the data grid.
The availability is computed by dividing the connection and execution time by the available time. The connection and execution time is the sum of all tests’ connection and execution time in the period. This value is presented to you in days, hours, minutes and seconds. The OEE parameters section gives you inputs to specify the available time. Specify the number of hours per weekday for which a test machine should be available during a typical week.
You may inspect all the source data by a click on a row’s matrix view button in the data grid. A new window will open and present the source data (Matrix view).
OEE Details view
Investigate a test station further by a click on a row’s magnifying glass in the data grid. A new window will open and present a more detailed view of the results (OEE analysis details). The details view lists calculations by period. You can group by day, week or month and have the OEE calculations presented for each of them. If you operate on multiple sockets, the grid will list the distinct sockets and their OEE calculations and you will need to expand a socket of interest to view the period calculations.
A period chart is presented to visualize the test machine’s OEE by period. This chart will display the total number of test reports as columns, together with the OEE calculations as lines. The chart will line up with the selected period grouping (day, week or month). If you operate on multiple sockets, a second socket chart is also presented, and you will need to select the socket of interest in the period chart (the socket with lowest OEE is initially selected).
When sockets are used, the socket chart displays the total test reports produced for each socket and the OEE calculations for each of them as lines. With the socket chart, you should easily be able to identify a problematic socket.
Please sign in to leave a comment.