Program Description
This program can be found on the System Manager Serial File menu (LMSY-1-3-18). It will change the date placed and initial meter reading (SERIALD) on machines that are placed at a customer site and have a blank date placed. It looks at the oldest service call for that machine at that customer site to get the meter reading and call date. These two fields are used to write into date placed and initial meter reading. The AMV, MTBF, and MCBF that are stored in the Serial file (SERIALD) will be recalculated with the new information. The program prompts for a range of item numbers, serial numbers and product classes.
The program works in the following way:
The program searches the MODSERX index file for the item numbers and serial numbers, then searches the Item (ITEM) data file for the product class. The only file that is written to is the Serial (SERIALD) data file.
The Mean Copies Between Failure (MCBF) is calculated by taking the greater of the last service call meter reading or preventive maintenance (PM) call meter reading (MAXMETER) minus the install meter reading (IMET) divided by the number of calls in the Serial (SERIALD) file.
The Mean Time Between Failure (MTBF) is calculated by taking the greater of the last service call meter reading or preventive maintenance call meter reading (MAXMETER) minus the install meter date (IDATE) divided by the number of calls in the Serial file.
The Average Monthly Volume (AMV) is calculated by taking the greater of the last service call reading, preventive maintenance call meter reading, or last meter reading and making it equal to the Maximum Meter Reading (MAXMETER).
Then the difference of meter readings is calculated by taking the Maximum Meter Reading (MAXMETER) minus the install meter reading (IMET).
The Amount of Time in Service is then calculated by taking the Maximum Meter Reading Date (MAXDATE) minus the Install Meter Reading Date (IDATE).
This number is then divided by 30 to equal the Amount of Months in Service. If this is less than one month, the number of months is equal to one.
Then the difference in meter readings is divided by the Amount of Months in Service to equal the Average Monthly Volume (AMV).
The calculations are as follows:
(MAXMETER – IMET) / Number of Calls = Mean Copies Between Failure (MCBF)
(MAXMETER – IDATE) / Number of Calls = Mean Time Between Failure (MTBF)
(MAXMETER – IMET) / ((MAXDATE – IDATE) / 30) = Average Monthly Volume