EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Dave92F1 on September 08, 2023, 07:06:22 pm
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I have a shunt resistor marked "Bader BMN4P/10Q 1R00 V19 0.1".
I'm pretty sure it's 1 ohm, 0.1%, but don't know how many watts/amps it'll take.
I can't seem to find a datasheet for it. Anybody know the wattage rating on these?
It looks exactly like this one (identical package, different markings): https://www.researchgate.net/figure/Shunt-resistance-used-in-the-assays-shunt-resistance-datasheet_fig5_339702401 (https://www.researchgate.net/figure/Shunt-resistance-used-in-the-assays-shunt-resistance-datasheet_fig5_339702401)
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I do not know that particular resistor, but if it were an "ammeter shunt" it would usually be designed for 50 or 100 mV voltage sense, or 100 mA for a 1\$\Omega\$ resistance.
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I can't find a datasheet for this specific resistor, but given the size and heat sink, I would imagine it is at least a 10W resistor. Always go higher in rating when you are unsure!
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The article you linked shows a 10W resistor. Since the part number looks the same except for the nominal resistance, I'd assume yours is 10W as well,
likely almost certainly requiring a heat sink. You'll need to think about the tempco, the 0R020 one in the article stated 300ppm/C, but your 1R0 might be better.
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I found the datasheet for the resistor you linked to, which is a smaller resistance.
0.02 ohms
0.1% tolerance
10 W max power
< 10 nH inductance
The authors of the article needed a shunt resistor with small inductance for supercapacitor measurements.
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From the research paper ...
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I have some resistors that look the same (series ISA-PLAN, model A-H). Could be some custom order.