| Electronics > Metrology |
| DIY 20A 0,1R Current shunt, Metrology grade(?) |
| << < (7/8) > >> |
| HighVoltage:
--- Quote from: laichh on January 03, 2023, 06:31:22 am ---My 10 mili-ohm DIY shunt, DC & AC calibrated by Ohm-Labs. --- End quote --- Very interesting DIY Shunt. Can you share the calibration certificate by Ohms Labs? |
| DavidKo:
I have noticed some cheap shunts when looking for shunt recommended by HighVoltage 10W Isabellenhutte R001 ±0.5% <10nH, 75ppm ~GBP25 50W RXM50 R001 A ±0.05% nothing said about inductance, 30ppm ~GBP190 |
| HighVoltage:
--- Quote from: DavidKo on January 03, 2023, 02:40:22 pm --- I have noticed some cheap shunts when looking for shunt recommended by HighVoltage 10W Isabellenhutte R001 ±0.5% <10nH, 75ppm ~GBP25 50W RXM50 R001 A ±0.05% nothing said about inductance, 30ppm ~GBP190 --- End quote --- Interesting, I was not aware of the RXM50 series resistors. Thanks! The RUG-Z resistors by Isabellenhütte are much more expensive: https://uk.rs-online.com/web/p/chassis-mount-resistors/4904827?sra=pmpn £930.74 + VAT |
| ap:
The value of the RUG-Z is that it is available in a 1ppm/K version. AFAIK no other high power single resistor is available with such tight TK. Distrelec offers them at a lower price, still expensve but worth it if one does not want to use a Ultrastab and needs a metrology high power solution. I use one in my lab with DIY solution fan case similar to the one shown above (but linear and external PSU for EMI reasons) for up to 10 Amps (0.1R) and I have also seen it drift very moderately over the years. |
| shenxiaoming:
Those 1ppm/K of RUG-Z shunt is false. They use two points method to measure TCR like 20 and 60 degree C. Precision resistors for Instrument often use box method such as VHP101. If one draw a box around 20 to 40 degree C between the X-axel and the upper limit of their curve, the TCR would be 13.5ppm/K. Even the typical line is 47ppm off making TCR=2.35ppm/K. We have witness one instance that the actual TCR is α23=+5.4ppm/K and β=-0.182ppm/K2 for a newly ordered RUG-Z-R100-0.1 TK1. Lymex entrusted me to publish the above information. |
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