Trouble encountered in cable testing -- a case study of a manufacturer?

One day ,Johnny Received a call from the technician of a cable factory in Houjie, Dongguan , He has a technical problem that has not been well solved . This is how it happened ： The jumper they made , Full inspection and delivery , But it was tested by its customers , There are always some jumpers NG, Was beaten back , We need to take the equipment to the site to find out the reason . This is in the jumper OEM or oem Although it is an example that often happens in , But at the same time, things often happen between cable factories . Often can't find the real reason , And cause everyone to quarrel with each other , So much so that everyone is fighting to the death , Extremely unpleasant .
ad locum , Make it clear to everyone , For the time being, Houjie cable factory is abbreviated as A factory , Its customers are B factory .
A The tester used by the factory is DSX-5000, Its PATCHCORD The module is DSX-PC6S;B The tester used by the factory is fluke DTX-1800,PATCHCORD The module is DTX-PC6S.

On 2 One day of the month , carry 2 set DTX-1800 As a verification tool and A Factory DSX-5000 Make comparison and verification . First we need to know ,DSX and DTX Belong to 2 Different test platforms , The test principle is not exactly the same .DSX-5000 It's a two-way test , and DTX-1800 It's a single test . It has been reported that the test accuracy is also different .


From the above table, we can see its specific specifications .
Continue with the above topic , The premise is the same as 1 Patch cord ,2 A train of thought ：
1,PATCHCORD Module once ;
2,CHANNEL Module once ;
Test and compare separately , Let's see how different the two items are ？

The verification result is ： They have their own DSX-5000 The test of the matching jumper adapter is inaccurate , The test value is on the high side . Use the channel standard to test ,3 The test value of the machine is almost the same , There is no difference 1 individual DB.
In other words, this case tells us ：
1, The machine has passed the calibration time , Be sure to calibrate again , Regardless of DSX-5000 still DTX-1800;
2,PATCHCORD In the test module , Wear and tear parts JCAK Socket , Be sure to replace it regularly （ Look at the frequency you use ）;
How to determine whether it should be replaced JACK？ You can make a sample line , Keep the test results , If the test of the module deviates 2db Or more , It should be replaced in time .