Author Topic: Sencore LC102 & LC103 Capacitor & Inductor Analyzer  (Read 1954 times)

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Offline HighVoltage

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Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« on: July 18, 2019, 09:17:47 am »
This thread is about the Sencore LC102 and LC103 Capacitor & Inductor Analyzer




I am interested to buy a Sencore LC102 Capacitor & Inductor Analyzer in good working condition with accessories for a reasonable price.

Preferable from within the EU but if needed, it can be shipped from outside the EU as well.


« Last Edit: August 18, 2019, 04:31:12 pm by HighVoltage »
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Offline cahillsr

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Re: WTB: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #1 on: July 20, 2019, 06:52:27 pm »
I have one needs repair. Everything seems to  work execpt ESR and leads won't zero on open. I am in NH USA
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #2 on: July 31, 2019, 11:49:07 pm »
I have found a broken Sencore LC103 instead and bought it.
Might be a good repair thread.
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Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #3 on: August 01, 2019, 02:27:00 am »
Just bought one too, for a very low price, (never tough it would be best offer accepted loll)  clean casing, nothing broke,  no xformer no test probes. 
Luckily i have a matcing xformer with the right plug who will fit nicely, and at my company we have very good Belden rf cables who could work.

The zeroing problems are known,  you have a white relay who oxidize over time, some had sucess with deoxit spray,  but opening the relay is tricky, and you have to be careful not to contaminate the inside with debris.

You have the test plug with the integrated fuse who get loose some times

And some had problems with the small black reed relays, they get stuck or dont operate properly

And in the manual you have a section for the specs or failures when zeroing,  impedances values  etc..  and use an 93-96 ohm low capacitance cable ...


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

Some link here :
https://www.eevblog.com/forum/testgear/sencore-lc102-cap-analyzer/
Replies #20 and 21  are interesting
« Last Edit: August 01, 2019, 02:45:07 am by coromonadalix »
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #4 on: August 01, 2019, 08:59:10 am »
Nice, thanks for the info
I am looking forward to get my ReZolver !
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Offline Sencoretech

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #5 on: August 01, 2019, 12:58:48 pm »
Nice, thanks for the info
I am looking forward to get my ReZolver !

Having worked on both the 102 and the 103 for a decade as my full time job I can tell you the 102 will be easier to fix in the field vs the 103.  I'm hoping you find it with no major issues.   If you need some help troubling shooting I'm more then willing to help, but PM me as I don't check these forums often.
 
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Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #6 on: August 01, 2019, 01:59:39 pm »
Thank you,

The LC103 is on its way and I hope it has not too many issues.
The seller claimed it needs calibration, so I am not sure if the label is expired or if it has an issue.
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Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #7 on: August 06, 2019, 02:55:05 pm »
Received my lc102, i think i've scored big,  all  zeroing / open test leads works,  all coils and caps ive tested seems fine

The only thing i have to figure out is : the selected output voltage, is it a pulsed voltage to the selected value, or it is continuous when i push the test button ??

I have the right power supply plug,  but an leader 12vac xformer instead of an dc one ........  unless i hack a rectification in it ??
 

Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #8 on: August 06, 2019, 05:07:41 pm »
Tks mr.fabe

Checked the bnc fuse contacts just in case, i think it was never unscrewed ?

Opened the casing,  never touched or repaired, all seems fine, managed to supply it thru an computer fan connector on the 3 pins psu  dc in / battery in connector .....  12vdc  simulated battery works fine but it wont start on the 3 pins dc plug, it need at least 15 - 18vdc to start.

Found an 2 feet bnc to 3.5 mm already made cable   (dont know its use or how i got it 10 years ago ??,  it zero and open fine  yepeeee loll   test at 6.5 pf ?? gonna add an 3.5mm female plug with 2  clip connectors, i'll sse if it accepts them

And find an 12vdc lead acid battery of the same size ??

This one has different / newer reed relays,  they are "metallic" enclosed ??  from American Relay
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #9 on: August 06, 2019, 06:16:40 pm »
Received my lc102, i think i've scored big, 

I got my LC103 today as well and it works like a charm.
It is by far the best capacitor tester I have seen.

In leakage test mode, it applies up to 1000 Volts DC directly to the pins of the cap.

I had a DMM in parallel to the cap to watch the voltage and a good cap was detected as bad because of the 10 MOhm of the DMM.

Over the years I had collected lots of bad electrolytic and also bad film capacitors.
And the LC103 detected all failure modes perfectly.

I will post pictures soon.

What a great instrument, highly recommended!
May be we should move this thread to the Test Equipment section.

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Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #10 on: August 06, 2019, 06:28:53 pm »
Tks mr.fabe

Checked the bnc fuse contacts just in case, i think it was never unscrewed ?

Opened the casing,  never touched or repaired, all seems fine, managed to supply it thru an computer fan connector on the 3 pins psu  dc in / battery in connector .....  12vdc  simulated battery works fine but it wont start on the 3 pins dc plug, it need at least 15 - 18vdc to start.

Found an 2 feet bnc to 3.5 mm already made cable   (dont know its use or how i got it 10 years ago ??,  it zero and open fine  yepeeee loll   test at 6.5 pf ?? gonna add an 3.5mm female plug with 2  clip connectors, i'll sse if it accepts them

And find an 12vdc lead acid battery of the same size ??

This one has different / newer reed relays,  they are "metallic" enclosed ??  from American Relay

BNC fuse connector causes a lot of issues with the Sencores that use them.  Poor contact affects the lead zeroing.

The power plug requires at least 18 VDC.  You can power the unit with lower voltage but it will shutdown on leakage tests depending on the test voltage used.

Cables used for test leads are the RG62 / 93 ohm stranded core similar to the Belkin 8255 but a little softer.  Some LC units can zero out with RG58 but have issues with lower cap readings.

Powersonic batteries work with clip with adapter plug. 
« Last Edit: August 06, 2019, 06:38:32 pm by mr.fabe »
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #11 on: August 06, 2019, 07:12:38 pm »
Powersonic batteries work with clip with adapter plug.

Interesting,
Do you have a link to that battery?

I see some batteries on ebay for around 70 US$
Are they worth it?
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Offline GEOelectronics

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #12 on: August 06, 2019, 07:20:43 pm »
I've had the LC103 since it first came out, now they cost more used than new back then, wish I had bought a spare! L+C but not R specifically. Be careful at the HV settings, they mean business. Blew out one GR polyethylene decade cap during testing- egad, IET does not sell individual caps but glad to sell an individual  decade switch- at a price.

This is my first capacitor meter that does a lead test first, shorted and open, then subtracts the measured capacitance from the device under test measurements. Sencore was high end for the service technician's workbench, still have several of there scopes in service.

Still hanging on to the old bridges and meters out of nostalgia, but will probably start selling them to make space pretty soon, including some ESI universal impedance racks.

The 34470A does a lot of things better, but not everything. ACAL every day, sometimes several times, it does drift with temperature. Using 34470A to test 1G Ohm resistors overnight has given me renewed confidence in my ESI Precision Resistance Measurement system for high R values, it comes really close and it only takes 30 seconds. That rack is a keeper.

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Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #13 on: August 06, 2019, 07:22:52 pm »
Powersonic batteries work with clip with adapter plug.

Interesting,
Do you have a link to that battery?

I see some batteries on ebay for around 70 US$
Are they worth it?

Not worth it. 
Powersonic PS-1223 2.3 Amp Hr works for my LC103
I'll have to check for the links...
 
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Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #14 on: August 06, 2019, 07:35:14 pm »
battery specs: 12vdc at 2.3 amps
https://cdn.shopify.com/s/files/1/2694/4298/files/PS-1223_SPEC_SHEET.pdf?16089243122879519379

Length:
 7.17" (182mm)   
Width:
 0.94" (24mm)   
Height:
 2.40" (61mm)   

They ressemble old portable camera and camcorder pack ??  Around   55$  CAD  in my country
« Last Edit: August 06, 2019, 07:41:03 pm by coromonadalix »
 

Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #15 on: August 06, 2019, 07:43:41 pm »
Here's a pic of the battery and clip..  I think I paid around $24 USD  for the battery and $5 for the clip.

804750-0
« Last Edit: August 06, 2019, 08:19:10 pm by mr.fabe »
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #16 on: August 06, 2019, 09:16:29 pm »
I've had the LC103 since it first came out, now they cost more used than new back then, wish I had bought a spare!

Good idea.
I think I will buy a second LC103, if I find another one for a good price.
One quote I got from a used equipment seller was US$ 7200
It is totally crazy, how much some instruments have increased in price over the years.
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Offline zucca

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #17 on: August 07, 2019, 08:06:15 am »
I was thinking my Agilent 4263B was enough to test L or C components...
Why there is always a new toy to buy?
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Online BU508A

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #18 on: August 07, 2019, 10:05:45 am »
I was thinking my Agilent 4263B was enough to test L or C components...
Why there is always a new toy to buy?

This question will be answered here:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/

 :)
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Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #19 on: August 08, 2019, 01:17:31 am »
I will upload to K04BB  website the joint together multi part pages for the boards, took few hours to do

The 1000 board,  already made by someone

Made by me
The block diagram
The 2000 and 3000 board   

Around 17 megs each,  had to patch  ic16 ic17  and ic26 on the 2000 "Mcu" board, no manual around the web has this section correctly scanned ??

Hope it help

Copied in the test instruments,  until someone complain or the admins remove it ?
« Last Edit: August 08, 2019, 01:20:28 am by coromonadalix »
 

Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #20 on: August 08, 2019, 09:49:38 pm »
Uploaded the LC102 calibration procedures at K04BB too
 

Offline philexile

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #21 on: August 18, 2019, 01:14:18 pm »
Hello,

I recently purchased an Sencore LC103 and I'm waiting for it to be delivered. It will be arriving without a power supply and I'm having problems identifying the 3-prong power jack on the rear of the unit. Does anyone know the name of this connector? I don't think that it is proprietary to Sencore, but I could be wrong.

Should I instead ignore that and go through the 12v battery connector? If so, what sort of molex connector is that?

Also, I've attached the calibration procedure PDF for the LC103. It appears to require specific software and hardware. You'll see mention of Final Cal Test program, final test box, ringer test box, ringer cal box, final test box, large inductance box, and high cap box. There is also mention of a Standards book "on the bench."

Does anyone have access to the items noted above or performed a calibration?

Thank you
 
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Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #22 on: August 18, 2019, 01:32:07 pm »
I just took my LC103 apart for the first time but it is difficult to get to the connector on the inside.
It would require to remove the top or bottom PCB

Here are some tear down pictures.

I do not know the manufacturer of that 3 pic connector

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Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #23 on: August 18, 2019, 01:32:58 pm »
More pictures
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Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #24 on: August 18, 2019, 02:11:28 pm »
I do not know the manufacturer of that 3 pic connector

I don't know the manufacturer but the connector type is a Mini-IEC (ACL117) that sells for $7.95 AUS.

https://www.wagneronline.com.au/mini-iec-to-bare-wire/ac-power-leads-iec/power-240vac/power-lighting/acl117-47410/969715/pd/

You should probably ask the sysop move this topic to test equipment or start a fresh thread....
« Last Edit: August 18, 2019, 02:24:02 pm by mr.fabe »
 
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Offline coromonadalix

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #25 on: August 18, 2019, 03:36:12 pm »
Managed to get the Sencore IB78 RS232 interface  for a premium price

Gonna try to make a schematic for it,  the eeproms dump now exists,  will compare to mine when i'll have it ...

A member here pigrew is trying to simplify the design for his usage, dont know if it'l get public

I'll try to do the same on slightly older tech ??  5v i/o fpga / cpld ...  but i'm rusty

Tested my lc102 so far, i had the supply cord from an leader ac xformer,  made a new dc supply for it,   works fine, lc102 seems pretty spot on,  cant find any calibration service near me to do a cal of this unit ???
« Last Edit: August 18, 2019, 03:40:03 pm by coromonadalix »
 

Offline HighVoltage

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #26 on: August 18, 2019, 03:47:14 pm »

You should probably ask the sysop move this topic to test equipment or start a fresh thread....

Requested, may be an admin will notice.
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Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #27 on: August 18, 2019, 04:51:16 pm »
Tested my lc102 so far, i had the supply cord from an leader ac xformer,  made a new dc supply for it,   works fine, lc102 seems pretty spot on,  cant find any calibration service near me to do a cal of this unit ???

If the readings are pretty close, I wouldn't adjust it unless you absolutely have to.  You have a LC102 and can perform the calibration yourself since the unit has variable pots.  Much similar to the LC53, LC75, LC101 type units.  I wish the LC103 had that option since calibration was quoted at $500-$600 USD.  Pretty ridiculous pricing for a non-Lab type piece of equipment...
 

Offline coromonadalix

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #28 on: August 19, 2019, 01:43:39 am »
The lc102 need a few  parts for calibrating it myself

I have a hard time to find 0.25% precision caps and some coils values in Canada

You need:

caps
1500pf
1.2uf
500uf

coils
20uh
80uh
800uh
8mh
60mh
80mh
800mh
2 henry
8 henry

res  not wire wounded type   not too difficult to find
1 ohm
15 ohms
20 ohms
150 ohms
250 ohms
1,5K ohms
50k ohms

 

Online mr.fabe

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Re: Bought: Sencore LC102 Capacitor & Inductor Analyzer
« Reply #29 on: August 19, 2019, 02:15:31 am »
Here's a pic of the battery and clip..  I think I paid around $24 USD  for the battery and $5 for the clip.

(Attachment Link)

Sorry about the delay on the battery clip information...

The battery clip I purchased was from DigiKey.

https://www.digikey.com/product-detail/en/mpd-memory-protection-devices/ZA5350-B/ZA5350-B-ND/124921
« Last Edit: August 19, 2019, 03:47:06 pm by mr.fabe »
 
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Offline HighVoltage

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #30 on: August 19, 2019, 08:25:39 am »
The lc102 need a few  parts for calibrating it myself

I have a hard time to find 0.25% precision caps and some coils values in Canada


The caps and inductors should also be easy to get.
Let me see what I can find in my bins.

I will use my Philips / Fluke PM6306 to select the values of caps and inductors.
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Offline Xenawise

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #31 on: August 19, 2019, 08:33:53 am »
@HighVoltage:

Hello, looks like you have a first production version of you PCB's (Version "B"). I recently repaired this version LC103 (it would fail the "OPEN" test but complete the "SHORT" test - turns out it was one of the SOT-23 2N3906 - Q13 - transistors in the low current source circuit. The transistor is completely open, all leads! Not sure what happened to it, there are no physical signs of failure either like too much current blew a chunk out of the case or something. It looks "normal" just like it's sister (it is connected in a darlington pair). Took quite a while to find this as well, I would say I have over a week into troubleshooting alone and since I have two LC103's now I could do some part swapping to help with the process.

In any case, I see that your EPROM is version 1.53! I have a Version "C" LC103 as well (I have two of them and actually three LC102's, one of them I need the LCD displays for as they got cracked during some shipping damage) and it has version 1.41 of firmware. Perhaps you could pull the EPROM and read it and post up the resulting BIN file? I would love to update to the latest firmware, although I wonder if the calibration of the unit is somehow tied the version of firmware (highly likely) so it might just be better to stick with whatever EPROM shipping in the unit to maintain the calibration. My Version "B" LC103 has firmware version 1.31. I have swapped the 1.41 firmware chip into the Version "B" and it does work, and your pictures show you have a Version "B" unit with version 1.53 firmware. Maybe it was sent in for repair or calibration and Sencore updated the firmware during the repair. As for Version "A" models, I don't think they were sold and were probably the last of the pre-production units. I believe Version "B" PCB's were the first production runs. My Version "C" unit does not have any of the bodges that the Version "B" PCB's have, and the power supply unit has some significant changes as well.

In any case, have fun with your LC103! They will only rise in value as time goes on I predict, unless some manufacturer comes up with something that can replace it which I doubt will ever happen.

Regards,

Xenawise
 
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Offline coromonadalix

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #32 on: August 19, 2019, 02:24:25 pm »
A 20 farad or 20 henry lcr seems improbable, with an 1kv leak test ?? more improbable ?  seen tons of models up to  100,000uf  seen nothing in recent models higher or equal to the lc102, lc103  can offer ??

I can be wrong
« Last Edit: August 19, 2019, 02:26:09 pm by coromonadalix »
 

Offline HighVoltage

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #33 on: August 19, 2019, 06:22:00 pm »
@Xenawise
Very interesting, thanks.

OK, I will get the EPROM version 1.53 read out.

Based on your facts, it really seems that my unit was repaired at a later time and the new FW installed.
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Offline syau

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #34 on: August 19, 2019, 11:12:08 pm »
Scored a LC102, unable to zero on short, other capacitor measurement work except the ESR which give -ve  :palm:

Managed to open up the cover on the big white relay, cleaned the contact with deoxit, also did so with the adjacent one. Still fail when I do zero on short. Surprising, it show short when I shorted the lead during capacitor measurement.

Need to do some trouble shooting on the ESR circuit.

 

Offline coromonadalix

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #35 on: August 19, 2019, 11:34:46 pm »
@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)
 

Offline syau

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #36 on: August 19, 2019, 11:47:31 pm »
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.
 

Online Johnny10

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #37 on: August 20, 2019, 12:49:17 am »
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.

Tek TDS7104, DMM4050, HP 3561A, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, Fluke 181 Nanovoltmeter, Dos4Ever uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, 1062LS101
 

Offline coromonadalix

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #38 on: August 20, 2019, 02:04:44 am »
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 :(
 

Offline syau

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #39 on: August 20, 2019, 04:02:23 am »
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 ?

 

Offline HighVoltage

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #40 on: August 20, 2019, 09:17:50 am »
Since we started repairing these Sencore units on the EEV Blog Forum the price has gone way up!


It is really crazy, how much they have increase since this thread is open!
For LC102 and LC103

I just got a quote from a company for a LC103 in good condition for US$ 4800 !

There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline Mr. Scram

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #41 on: August 20, 2019, 09:36:17 am »
It is really crazy, how much they have increase since this thread is open!
For LC102 and LC103

I just got a quote from a company for a LC103 in good condition for US$ 4800 !
Such is the Eevblog. The prices will come down again when the initial hype blows over though.
« Last Edit: August 20, 2019, 09:38:20 am by Mr. Scram »
 

Online BU508A

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #42 on: August 20, 2019, 09:50:07 am »
I just got a quote from a company for a LC103 in good condition for US$ 4800 !

I hope, you've showed them this:

“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline HighVoltage

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #43 on: August 20, 2019, 10:54:22 am »

I hope, you've showed them this:

Yup!

I am glad I have a good working LC103, that I got for a good price. I might buy a LC102, once the prices have come down again.
No hurry!  :-DD

In regards to open and short compensation, I have tried a normal 50 Ohm BNC cable and it would not confirm the open compensation. So it seems Sencore has limited this to special cables.
I will try a few other cables soon.

There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline syau

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #44 on: August 20, 2019, 01:56:30 pm »
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 ?

Did an in circuit testing of L1, it works but still can’t cal short nor ESR (start with -1990 displayed on the LCD and the value slowly increase up to -9.0 ohm)  :--

Anybody has an idea how the ESR circuit works ? One member did mentioned that it use the ESR circuit to do a cal short.
 

Online Johnny10

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #45 on: August 20, 2019, 02:19:36 pm »
That zero issue fix on Antique Radio was a bit off in technique.
I first cut into the top of relay cover as shown in pics.
Yet afterwards, I found I could simply squeeze rectangular cover and it unlocked and whole cover came off without having cut on top that then needed to be fixed.
« Last Edit: August 23, 2019, 12:59:58 pm by Johnny10 »
Tek TDS7104, DMM4050, HP 3561A, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, Fluke 181 Nanovoltmeter, Dos4Ever uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, 1062LS101
 

Online mr.fabe

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #46 on: August 20, 2019, 03:33:06 pm »
In regards to open and short compensation, I have tried a normal 50 Ohm BNC cable and it would not confirm the open compensation. So it seems Sencore has limited this to special cables.
I will try a few other cables soon.

With the LC53, LC75, LC101 (units that I've owned), RG62 cables were needed to be able to zero out the meter.
With my LC103, I have no trouble with open and close compensation with any of the cables I normally use.  I use the Sencore 39G219, Fluke tweezers, mini 7" BNC to clip hook leads, and sometimes a set of needle probes for in-circuit tests.

Per the LC103 Manual for Value Beyond Zeroing Limit...

An open (greater than 20kohms) or shorted (less than 1 ohm) test lead will cause the display to show "OPEN" or "SHORT"
Possible Causes:
1. The capacitance at the TEST LEAD input is greater than 1800pF
2. The inductance at the TEST LEAD input is greater than 18uH
3. The resistance at the TEST LEAD input is greater than 5 ohms
« Last Edit: August 20, 2019, 08:47:01 pm by mr.fabe »
 

Offline syau

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #47 on: August 23, 2019, 12:37:11 pm »
Replaced L1 & L9, no improvement  :-BROKE

Will try to replaced the 4011 & 4066 in the ESR circuitry.
 

Offline volvo_nut_v70

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer LC102 Keyboard
« Reply #48 on: August 23, 2019, 03:26:33 pm »
Hello;

I am looking for a new or used LC102 membrane keyboard to repair the one I have. One of the "button" is worn straight through....

Thanks!
 

Offline HighVoltage

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer LC102 Keyboard
« Reply #49 on: August 23, 2019, 03:39:25 pm »
Hello;

I am looking for a new or used LC102 membrane keyboard to repair the one I have. One of the "button" is worn straight through....

Thanks!
Every once in a while, they show up on ebay USA but right now I do not see one.
You probably have to have some patience.
 
There are 3 kinds of people in this world, those who can count and those who can not.
 
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Online mr.fabe

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #50 on: August 26, 2019, 10:46:32 pm »
The lc102 need a few  parts for calibrating it myself

I have a hard time to find 0.25% precision caps and some coils values in Canada

You really can get by with using higher (>0.25%) components for calibrating the unit.  Verify the component values on a calibrated LCR and use those values to adjust the trimmers for each of the respective ranges.  Just make sure you use the original 39G219 or low capacitance cable and perform the lead zero operation before making your adjustments.
 

Offline Xenawise

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #51 on: August 27, 2019, 06:08:40 pm »
@Xenawise
Very interesting, thanks.

OK, I will get the EPROM version 1.53 read out.

Based on your facts, it really seems that my unit was repaired at a later time and the new FW installed.

Any progress on getting that EPROM read and posted? Thanks!  :-+

Regards,

Xenawise
 

Online mr.fabe

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #52 on: August 27, 2019, 06:37:32 pm »
@Xenawise
Very interesting, thanks.

OK, I will get the EPROM version 1.53 read out.

Based on your facts, it really seems that my unit was repaired at a later time and the new FW installed.

Any progress on getting that EPROM read and posted? Thanks!  :-+

Regards,

Xenawise

Would you be able to read the memory chip at U21 (24LC16B) off one of your boards and post it?  I believe this chip may hold the calibration settings for the LC103 and hope to get it decoded.  Thanks!
 

Offline coromonadalix

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #53 on: August 28, 2019, 12:41:48 am »
Bought two already hand made cables  on Ebay,  i can zero my test cable but do an open test,   found many coils and capacitors parts to do some tests, the lc102 seems to be on par with them,   my job ordered an DE-5000, ill do more cross checks between the two.

EDIT August 30
Received the cables, they are worth the price,  perfect  open and zero calibration
« Last Edit: August 31, 2019, 03:40:43 am by coromonadalix »
 

Offline Xenawise

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #54 on: August 28, 2019, 10:27:42 pm »


Would you be able to read the memory chip at U21 (24LC16B) off one of your boards and post it?  I believe this chip may hold the calibration settings for the LC103 and hope to get it decoded.  Thanks!

I will see about desolding that chip and reading it out and posting it.

Speaking of posting, here are my BIN files (rename to .BIN from .TXT)

Regards,

Xenawise
 
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Offline volvo_nut_v70

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Re: Sencore LC102 & LC103 Capacitor & Inductor Analyzer
« Reply #55 on: September 12, 2019, 02:26:17 pm »
Hello;

Would any one have a new or used membrane keyboard for a LC102?
 


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