Mastech MS8268 Digital Multimeter  resistor R32 color code - Page 1
Forum section: electronics / beginners

author: jcii2
author_rank: Newbie
timestamp: September 23, 2011, 02:25:23 am
content: I own a Mastech MS8268 Digital Multimeter.I completely burned out resistor R32 of the Mastech MS8268 Digital Multimeter .It is burned so bad, I am unable to make out the 5 band color code on resistor R32 of the Mastech MS8268 Digital Multimeter.I would like to know, what is the 5 band color code of resistor R32 for the Mastech MS8268 Digital Multimeter ?It is the largest resistor on the board. I think it is a 1/2 watt resistor.Could anyone who happens to have a Mastech MS8268 Digital Multimeter, tell me the 5 band color code of resistor R32 for the Mastech MS8268 Digital Multimeter?Thanks.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 23, 2011, 04:59:57 am
content: Just of curiosity, did you try to contact Mastech by email ?

author: jcii2
author_rank: Newbie
timestamp: September 23, 2011, 08:56:50 pm
content: Yes, I did send them a request for the info. yesterday. But, I have not heard from them.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 23, 2011, 09:42:12 pm
content: From my fresh experience with them, it will take a week so to get their reply.

author: FE
author_rank: Newbie
timestamp: September 25, 2024, 07:43:43 am
content: Hello to all,I just found this topic discussion, as I'm in the same situation, whereas the foil surrounding the R32 shunt resistor together with the color code has been burned and can't figure out which is the value of the resistor. By measuring the resistance, it is showing me 5ohm, but this is quite big when measuring in the of mA. The thing is that when I'm measuring in the mA range, I'm experiencing a current drop of around 0.6A and after disassembling my MS8268 DMM, I saw this R32 shunt resistor burnedIs there a way to fix this issue, by giving the correct Rshunt resistor value ?Thank you in advance

author: mikerj
author_rank: Super Contributor
timestamp: September 25, 2024, 08:05:27 pm
content: https://youtu.be/gcQ7QVRX4KE?si=u-gAgKQqYxploKOl&t=569This video gives a nice close-up of R32 around the time I've included in the link (might need to skip a few frames using "," and "." if viewing on a PC or Mac). Looks to me like Green Black Black Silver Green, which I think makes it a 0.5 Ohm +-0.5% resistor.

author: FE
author_rank: Newbie
timestamp: September 26, 2024, 06:14:44 am
content: Hi jcii2,Thank you for looking and sharing that youtube channel. You are right, the color code Green, Black, Black, Silver and Green. After inserting the color codes intohttps://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code, I'm getting a value of5ohm ±0.5%and by measuring the resistance it seems to be correctMeanwhile I found the a website with this DMM disassembled and can confirm the color codes you shared : [size=78%]https://lygte-info.dk/review/DMMMastechMS8268%20UK.html.I hoped that this resistor will be root cause, but it seems that the 5ohm is the true value.Honestly I don't want to throw away my DMM, as there must be a way to fix it, by replacing most certainty a passive or active component ( ofc not the IC).Hopefully within this post and with your support this issue will be fixed.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 27, 2024, 05:06:31 pm
content: a thread many years agohttps://www.eevblog.com/forum/testgear/mastech-ms8268-calibration/it would be a matter of finding the dmm chip pdf, doesnt seem available anymoreask Mastech maybe you could get a schematic .... or maybe the ic is toasted or other parts