2D72 DMM spoiled

FatBoy · Post time 2021-5-12 21:48:14

Edited by FatBoy at 2021-5-12 21:49

Hello, my 2D72 cannot measure high voltage. Is there a fuse I need to replace? It can only measure low battery voltages like 9V or 3V. If I use it to measure 60V, it says 0.000mV. Same for AC measurement, I plug into the mains and it shows -0L.

Any help greatly appreciated. Thank you.

amy · Post time 2021-5-13 13:14:27

Please refer to this post.

https://www.eediscuss.com/forum. ... id=15336&extra=

FatBoy · Post time 2021-5-13 18:42:26

谢谢

FatBoy · Post time 2021-5-13 19:05:26

Looks like R13 also burnt. What is the value?

amy · Post time 2021-5-14 13:28:21

R15: Resistor-Fixed,1K,1/16W,0.1%,TCR25ppm,R0603
R14: Resistor-Fixed,10K,1/16W,0.1%,TCR25PPM,R0603
R13: Resistor-Fixed,101.01K,1/16W,0.1%,TCR25PPM,R0603

FatBoy · Post time 2021-5-14 13:34:29

谢谢

From the photo, do you think R12 is also burnt?

FatBoy · Post time 2021-5-14 15:24:20

Edited by FatBoy at 2021-5-14 15:26

Hello Amy, I have a problem. The shops in my country don't sell SMD resistors & definitely don't have resistors with tolerance of 0.1%.

Where can I buy those? Do you sell these parts?

Thank you for your help.

amy · Post time 2021-5-18 10:13:55

We can send them to you, but the freight is expensive.
Maybe you can purchase them on aliexpress.
https://www.aliexpress.com/whole ... t=0603+SMD+Resistor

FatBoy · Post time 2021-5-18 12:13:00

Hello Amy, what is the shipping charges like? I'm in Singapore, usually when I buy things from aliexpress, light items the shipping is about SGD5.

I've checked aliexpress, min order quantity for the resistors is 100pcs per resistance value, so if I order R12, R13, R14 & R15 that would be 400pcs total. So I don't know what to do with the remaining 396pcs after I repaired the DMM.

Please let me know your shipping charges. Thank you.

FatBoy · Post time 2021-6-8 11:49:04

Edited by FatBoy at 2021-6-8 11:52

Hello Amy, can you sell me the parts please? The parts with such tight tolerance are impossible to find. With 0.1% tolerance at 1/16W, and value of 101K ohm, I cannot find it in Aliexpress or ebay.

Thank you.

2D72 DMM spoiled

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