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What is Intermittent Testing? Futura Apsol Intermittent fault testing What is intermittent fault?
‘Intermittent’ is occurrence of momentary disconnection in a cable. Generally i t is observed in IDC cables like FRC. For example, FRC cable; normally shows continuity. But, because of movement, disconnection occurs for a very short period of time (microseconds or milliseconds) In other words, cable is generally ‘short’ , but ‘opens’ sometimes for a short time. It is a pain area, as it is most likely that the product works OK before dispatch and develops fault after installation because of ‘intermittent’ Why regular testers cannot locate intermittent faults?
Regular continuity testers, scan inputs i.e. points or circuits, at a regular time interval. For example a 64 points tester will check points 1 to 64, after every 1 millisecond. Hence each ‘point’ will be scanned after 64 milliseconds. Tester will find open only if ‘disconnection’ is at the moment of scanning. ‘Intermittent’ is an asynchronous event. Meaning it can occur anytime. Hence, if disconnection in a cable, occurs, when tester is checking other points, tester cannot locate disconnection. What is the technic used by Futura?
Regular continuity testers, scan inputs i.e. points or circuits, at a regular time interval. For example a 64 points tester will check points 1 to 64, after every 1 millisecond. Hence each ‘point’ will be scanned after 64 milliseconds. Tester will find open only if ‘disconnection’ is at the moment of scanning. ‘Intermittent’ is an asynchronous event. Meaning it can occur anytime. Hence, if disconnection in a cable, occurs, when tester is checking other points, tester cannot locate disconnection.
Futura has developed an intermittent finding technic for the first time in India. An additional ‘hardware circuit’ in each point or circuit, ‘memorises’ the asynchronous occurrence of disconnection. Hence when tester scans a point, it is checking if disconnection occurred earlier. Intermittent to occur; cable has to be ‘moved’ or ‘pulled’ or ‘rotated’ Futura Apsol Pvt Ltd What is the test process?
Test system consists of a tester and a test board or rig to mount the Cable / Harness Under Test. Testing is done in two steps. First is to check correct ‘continuity’. If OK then to check ‘intermittent’. Tester keeps checking for intermittent continuously and displays result as Pass. Cable under test is moved to generate intermittent fault. If a momentary disconnection occurs, tester displays intermittent fault with the circuit number. Intermittent test can be started again by pressing a key and test process repeated. Testing can be stopped by pressing a key. Even after moving Cable under test, intermittent does not occur, test can be stopped by pressing a key. Futura has launched a One-to-one tester with intermittent checking.
Futura has launched a One-to-one tester with intermittent checking. It is an enhanced version of CT121. Models are INT_CT_121_32 and INT_CT_121_64 for upto 32 circuits and upto 64 circuits.(32 way cable and 64 way cable). This tester will not check cables with mid-joints. Relay output on Passing a cable Futura can provide test boards for FRC cables. Contact sales@futuras.com for further information.