These test systems are based on measurement of NOISE from the test units. The system consists of NI Data Acquisition Hardware and customized software for data processing and display of results (OK or NOK). These systems can be retrofitted to the existing performance test rigs.Many such systems, supplied by ENVICON VIBROTECH , are presently functional in production lines of BOSCH, which make auto electric parts. These systems have been deployed in the starter and alternator assembly lines.