Anyone with a Craftsman 82357 Digital MultiMeter?

[Spork Schivago]

Hello!

Does anyone have a Craftsman 82357 Digital MultiMeter?   If so, would they be kind enough to open it up and tell me the measurement of the R41 resistor?   Mine is burnt and I cannot properly read the colour values, but need to replace it.   I really do not want to replace the DMM.   I've tried looking for the same one for sale, but have had no luck.   I really love this DMM.

Thanks!

[Cliff Matthews]

Hello!

Does anyone have a Craftsman 82357 Digital MultiMeter?   If so, would they be kind enough to open it up and tell me the measurement of the R41 resistor?   Mine is burnt and I cannot properly read the colour values, but need to replace it.   I really do not want to replace the DMM.   I've tried looking for the same one for sale, but have had no luck.   I really love this DMM.

Thanks!

WENS Instruments made that meter back in '99 (20R series). In your other thread I put a link to a page with the PC software in a zip file. If you can determine which model it is from the top 2 products on this page: http://www.ferner.se/catalogue/subcategories/23/
you may get lucky asking for support on this page: http://www.wens.co.kr/bbs/write.php?bo_table=inquiry_eng
(the PDF manuals on the 1st link would be a good download too)

Barring that, you could post the DMM chipset number here and again, with a little luck, the data-sheet may offer some app-notes
and basic example schematics to help identify.



*edit - specs here: http://www.ts-software-jp.net/products/pdfcatalog/wens_20t.pdf

[Spork Schivago]

Hello!

Does anyone have a Craftsman 82357 Digital MultiMeter?   If so, would they be kind enough to open it up and tell me the measurement of the R41 resistor?   Mine is burnt and I cannot properly read the colour values, but need to replace it.   I really do not want to replace the DMM.   I've tried looking for the same one for sale, but have had no luck.   I really love this DMM.

Thanks!

WENS Instruments made that meter back in '99 (20R series). In your other thread I put a link to a page with the PC software in a zip file. If you can determine which model it is from the top 2 products on this page: http://www.ferner.se/catalogue/subcategories/23/
you may get lucky asking for support on this page: http://www.wens.co.kr/bbs/write.php?bo_table=inquiry_eng
(the PDF manuals on the 1st link would be a good download too)

Barring that, you could post the DMM chipset number here and again, with a little luck, the data-sheet may offer some app-notes
and basic example schematics to help identify.



*edit - specs here: http://www.ts-software-jp.net/products/pdfcatalog/wens_20t.pdf

Thanks Cliff Matthews!   I have been to that page in my other post, a few times over the years, and was in touch with the owner of that site before posting my question for help here.

With physical appearances, it's closest to the 20TRMS.   Mine is a True RMS Autoranging PC Interface DMM.  It's the pictures for the various functions that look different on mine.   For example, for the AC / DC selection, mine actually says DC / AC V.   Mine also has temperature slots for a K-type thermocouple.  I see in the datasheet for the 20TRMS, the T means Temperature and the RMS means True RMS multimeter, so although it looks a little different with the printing on the case, mine would be the 20TRMS.   I'll use that to see if I can find more out about it.

If it would help, the chip on it is an FS9711_LP2.   I could not find much info on the LP2 version of this chip.  It says:

Code: [Select]

FS9711_LP2
9952
[url]https://www.fsc.com.tw[/url]

I believe the 9952 is a batch or date code.

I've uploaded some pictures, maybe it would help?   I believe the R41 and R40 might have something to do with current measurements, but I am not certain.   Is there a chance this Craftsman one could have been available before the Wens one?   For some reason, I remember it being purchased before 99.  I graduated in 99, so I use that as a reference point, and for some reason, I remember having it for a couple years before graduation.   I could be mistaken.

[Cliff Matthews]

The date code on the chip shows the 52nd week of 1999 so unless you had it repaired..   I searched at Fortune Semi Corp. under measurement, and all I could get was PDF's for their newer chips. https://www.ic-fortune.com/eng/new_product3_3.asp

*edit - The closest datasheet is here: https://www.datasheetarchive.com/FS9711_LP3-datasheet.html

**edit - That site kept redirecting the output PDF to the 9721, so I shuffled around and found a generic 9711 cct..
    (could it be your PCB's R41 is R14 on the test cct? Maybe at one time the probes stuck in the wrong jacks?)
This happens to the best of us..    Did you enjoy that nice magic smoke?

[Cliff Matthews]

Now that the PCB's removed, did you pull R41? (or what's left of it..?) BTW, that case was used in several WENS products, but one has to wonder if the reason you don't see much of these guys, is because Fluke's touchy about yellow holsters..

[grifftech]

get a cheap dmm and measure

[Spork Schivago]

The date code on the chip shows the 52nd week of 1999 so unless you had it repaired..   I searched at Fortune Semi Corp. under measurement, and all I could get was PDF's for their newer chips. https://www.ic-fortune.com/eng/new_product3_3.asp

*edit - The closest datasheet is here: https://www.datasheetarchive.com/FS9711_LP3-datasheet.html

**edit - That site kept redirecting the output PDF to the 9721, so I shuffled around and found a generic 9711 cct..
    (could it be your PCB's R41 is R14 on the test cct? Maybe at one time the probes stuck in the wrong jacks?)
This happens to the best of us..    Did you enjoy that nice magic smoke?

My memory is a bit faulty, so it must have been purchased in 1999.   I too could only find the datasheet for the FS9711_LP3.   I believe I know what happened.   It happened months ago.   I was careless and hired some help to help repair some TVs.   The person who was helping claimed they had a lot of expierence and knew exactly what they where doing.   They were working on the backlighting for a Samsung TV I believe and I heard this bang!   If memory serves, they crossed the probes while trying to measure one of the input filter caps.   They grounded it out and it ended up burning a small dip in my actual probes!   I don't know why they where even messing around with the PSU.   I had already told them what was wrong and what needed to be done and they said they had understood.   It didn't damage the TV anymore than it was already damaged, and thankfully, the guy wasn't hurt (except for maybe his ego a little?).

I think that's probably what damaged the DMM.   After that, it started acting up.   More than one decimal point on the screen, locking up while trying to take measurements.   Currently, I have to assume that any measurements taken with it could be completely useless.

That one company said no parts, no service manual, but they have a Wens 20TRMS they'd sell me, new, for 125 USD FOB (what ever FOB means).

[Cliff Matthews]

You can pay less for a decent bench-banger these days, check out our own Joe Smith's work.. if you get a product he respects (for the money) you going to get something robust. https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg/videos

[Spork Schivago]

Now that the PCB's removed, did you pull R41? (or what's left of it..?) BTW, that case was used in several WENS products, but one has to wonder if the reason you don't see much of these guys, is because Fluke's touchy about yellow holsters..

I took those pictures a few weeks ago, when I asked for help on BadCaps (but didn't have much luck).   So I came here and shrunk them and then uploaded them.   I can tear it apart and pull R40 and R41.   If R40 measures 990 ohm, and I trace to see if it follows that circuit, I think we found the value of my burnt out resistor!    These are tolerant resistors, 1% I believe.   I wonder if more accurate ones would make the meter more accurate for current measurements?

[Spork Schivago]

get a cheap dmm and measure

Measure what?   The burned out resistor?   I have other ways to measure currently...but being burned out, I read it as open when I tried measuring in circuit.   I figured if it measures open in circuit, it'll for sure measure open if I pulled it, and I didn't go any further there.

Thanks.

[Spork Schivago]

You can pay less for a decent bench-banger these days, check out our own Joe Smith's work.. if you get a product he respects (for the money) you going to get something robust. https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg/videos

I need a good bench DMM, but I still need my portable jobby for certain tasks.   I was looking at some of the Agilent / HP / Keysight benchtop meters, and will probably ask for suggestions here when I save up some money and get some of these pesky bills paid down.   I'll keep that link bookmarked for when that time comes.

[Cliff Matthews]

Dave's got a few videos encouraging us to hunt for gems (in the raw on Ebay)


Again confirmed, there's no other forum on the net that I'd call home

*edit - That box reminded me of Ace Ventura.. https://youtu.be/2Q6_9A90cUk?t=43 

[Spork Schivago]

Dave's got a few videos encouraging us to hunt for gems (in the raw on Ebay)


Again confirmed, there's no other forum on the net that I'd call home

*edit - That box reminded me of Ace Ventura.. https://youtu.be/2Q6_9A90cUk?t=43 

What's a good HP / Agilent / Keysight benchtop meter?   I really like those.   I believe Agilent bought HP, and then Keysight bought Agilent, or something like that, so in the end, Keysight ended up with all of the equipment.   I would end up either buying something with a traceable calibration, or send it out to get calibrated.   I've been in need of a benchtop DMM for a long time, but everytime I remember, I'm in a bad financial place!   When I'm in a good financial place, I don't remember!!!!!

[GreyWoolfe]

HP 3468A and 3478A bench meters can be bought reasonably.  There is a 3468A on evilBay for $95 that shows it passes self test.  If 4.5 digits works for you, there is a HP 3466A for $69 with a make an offer and has a 14 day right of return.  I paid less than $100 each for both my 3478As and paid under $50 each for the 2 3466As, actually $30 for one of them.  I did wind up modifying the 3466As with shrouded banana jacks and that was cheap to do.

[Spork Schivago]

HP 3468A and 3478A bench meters can be bought reasonably.  There is a 3468A on evilBay for $95 that shows it passes self test.  If 4.5 digits works for you, there is a HP 3466A for $69 with a make an offer and has a 14 day right of return.  I paid less than $100 each for both my 3478As and paid under $50 each for the 2 3466As, actually $30 for one of them.  I did wind up modifying the 3466As with shrouded banana jacks and that was cheap to do.

What would be considered some of the nicest models out there, any manufacturer?   Top of the line type things.

[Cliff Matthews]

Search the forum for Bench DMMs comparison we have no idea of desired features or price bracket  $500 $1k $2k etc..

[GreyWoolfe]

HP 3468A and 3478A bench meters can be bought reasonably.  There is a 3468A on evilBay for $95 that shows it passes self test.  If 4.5 digits works for you, there is a HP 3466A for $69 with a make an offer and has a 14 day right of return.  I paid less than $100 each for both my 3478As and paid under $50 each for the 2 3466As, actually $30 for one of them.  I did wind up modifying the 3466As with shrouded banana jacks and that was cheap to do.

What would be considered some of the nicest models out there, any manufacturer?   Top of the line type things.

Nicest? an HP 3458A.  Top of the line stuff.  They start on evilBay at about $4,000 and are about the size of a pizza box.  Otherwise, look at HP 34401, Fluke 45 or 8840. Keithley 2100, Fluke 8846, Keithley 196, GW-Instek 8251A.  People will scoff at the GW-Intsek but it is more accurate on 4 wire measurement than my 2 HP 3478s.  You can have anything you want with enough Benjamins.   

[Spork Schivago]

I found an Agilent 34401A and the price range, with calibration, is right.   695.00$ + 190.00$ for NIST traceable or 270$ for ISO IEC 17025 Accredited.   

(source) https://www.valuetronics.com/product/34401a-agilent-multimeter-used?gclid=CjwKCAjwkcblBRB_EiwAFmfyy4SY5vGUznjdUGQKrwfSh1S_dL8Wo6f4aMZ8qOJQeSImv0TCpeHIVBoCt_oQAvD_BwE

If I looked a little harder, I think I could find probably maybe a better deal on it.   Thanks!!!!!

[sslingerland]

Spork, did you figure out the resistor value for R41 on your craftsman multimeter?
a long shot by i have the same one and trying to figure out mine which is burnt..
Thanks, Scott