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Sencore LC102 & LC103 Capacitor & Inductor Analyzer

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coromonadalix:
@syau   does it says  error 7 ??  do you have an original test cable ? 


With a cable i had for years :  i've made the open short tests, they are okay, but if i add some tests clips to complete the cable  it doesn't pass the open test, but pass the short test  ... i have to get the correct impedance vs the cable capacitance ...

You have explications in the user manual for the errors test(s)

syau:
It show error 4 during short cal. I did bypassed the input coax and directly shorting the input to the pcb (the one has 1 thin white wire and 3 thick red) with the same result. (the white go to the shield, center red go the the coaxial center, the right red go to the coaxial center after the fuse)

Tried to remove the fuse (by turning bnc anti-clockwise) but unable to do so, looks like the previous owner turn it too hard in order the secure a good contact  :phew:

No error 7 during esr measurement, only give -ve which keep changing

Note: The test lead I am using is not original.

Johnny10:
Since we started repairing these Sencore units on the EEV Blog Forum the price has gone way up!

I repaired a number of these units a few years back.
I did buy parted out units etc. from this eBay seller.

https://www.ebay.com/itm/SENCORE-LC103-LC102-LC101-LC77-LC76-LC75-LC53-TEST-LEADS-SET-OF-THREE-NEW/113767939522?hash=item1a7d18fdc2:g:69QAAOSwhURZgj8w

All my units Zero, open and short, with a BNC adapter and regular clip cables.
When they don't zero it takes a while to track down the exact cause,  i.e. BNC Fuse Holder, Relays...
The relays were available on eBay also. I bought a few of the black ones from someone mismatching manufacturer name. They had 50 or so but that was a few years ago.

I should look that up again.

coromonadalix:
As Johny10 wrote

I did all the checkups  for the mta crimp connectors, some claimed the wire cut in the connector,   unscrewed the bnc fuse, it was tighten very well, i put an bnc connector and turned slowly counterclockwise with a pair of pliers, done every checkups i could do for oxydation on the 2 big relays and the bnc test plug.

With the calibration procedures i re-checked every voltages in the lc102, they were almost perfect for its age ?   touched nothing else.

Tested the open and short tests, everything went fine.

Sencore LC-102 Cable 'zeroing' issue and 'fix'   mostly the error 7
https://www.antiqueradios.com/forums/viewtopic.php?f=8&t=286666

Normally the test leads are made with an low capacitance cable rg-62u


@syau    Your error4   Value beyond zeroing limits, see page 18 of the user manual

It simply could be your tests leads are not accepted by the lc102


Just checked my tests leads, they are slightly over 1800 pf,  damn loll         short pass,  open fail 
They are coaxial, but no specs written :(

syau:
I suspect that the relay L1 failed to close during ESR and Short Zero measurement and will test it out later today. In the mean time, I ordered several 5VDC reed relay from RS (diff pin out) but better spec, which should be delivered within 3 days.

Testing has been done on the P3 connector so it ruled out the test lead issue.

By the way, any one know the source of the fused bnc jack ?

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