High-current resistance measurements

Otto Wolff 14142/5 100 µΩ oil bath resistance standard, rated current 200 A

Measurement

Source setup: Fluke 5720A + Fluke 5725A, Isrc = 10A with polarity reversal

Detector setup: Keithley 2182A on 10mVDC range, channel 1, NPLC5

Wiring:

Result

Air temperature Calculated resistance Deviation from nominal, ppm
22.431 9.99897252E-05 -102.75 ppm
22.425 9.99900842E-05 -99.16 ppm
22.412 9.99902167E-05 -97.83 ppm
22.409 9.99902632E-05 -97.37 ppm
22.386 9.99906032E-05 -93.97 ppm
22.386 9.99901224E-05 -98.78 ppm
22.368 9.99903175E-05 -96.83 ppm
22.389 9.99906209E-05 -93.79 ppm
22.389 9.99900781E-05 -99.22 ppm
22.375 9.99902975E-05 -97.02 ppm
22.365 9.99900943E-05 -99.06 ppm
22.37 9.99900255E-05 -99.75 ppm
22.353 9.99905653E-05 -94.35 ppm
22.339 9.99899150E-05 -100.85 ppm
22.347 9.99900953E-05 -99.05 ppm
22.34 9.99902026E-05 -97.97 ppm
22.324 9.99905397E-05 -94.60 ppm
22.317 9.99903802E-05 -96.20 ppm
22.329 9.99902832E-05 -97.17 ppm
22.33 9.99903598E-05 -96.40 ppm
22.354 9.99902256E-05 -97.74 ppm
22.385 9.99905915E-05 -94.08 ppm
22.4 9.99905119E-05 -94.88 ppm
22.388 9.99903301E-05 -96.70 ppm
22.369 9.99903867E-05 -96.13 ppm
22.381 9.99904795E-05 -95.21 ppm
22.346 9.99905836E-05 -94.16 ppm
22.324 9.99906073E-05 -93.93 ppm
22.304 9.99903018E-05 -96.98 ppm
22.294 9.99905857E-05 -94.14 ppm
22.3 9.99906402E-05 -93.60 ppm
22.335 9.99902974E-05 -97.03 ppm
22.343 9.99900583E-05 -99.42 ppm
22.359 9.99903324E-05 -96.68 ppm

Calculated measurement

Median value : 99.99031 µΩ
Median deviation: -96.9 ppm @ +22.36 °C
Standard deviation: 0.2247 nΩ
Uncertainty: ±0.02 %
Date : 27 June, 2020

Guildline Type 9290 shunt, 10 mΩ, rated current 100 A, air cooled. S/N 26140

Same measurement setup.

Air temperature Calculated resistance Deviation from nominal, ppm
24.619 0.010001527 152.7265
24.618 0.010001571 157.0715
24.625 0.01000158 158.012
24.644 0.010001596 159.5695
24.635 0.010001597 159.7245
24.639 0.0100016 160.0495
24.648 0.010001606 160.5925
24.647 0.010001595 159.475
24.666 0.010001612 161.164
24.673 0.010001616 161.613
24.663 0.010001595 159.515
24.665 0.010001598 159.819
24.685 0.01000161 160.9785
24.681 0.010001613 161.324
24.69 0.010001615 161.4505
24.725 0.010001634 163.413
24.797 0.010001624 162.4125
24.798 0.010001629 162.934
24.789 0.010001624 162.4365
24.775 0.010001635 163.4675
24.778 0.010001637 163.73
24.797 0.010001635 163.5465
24.767 0.010001639 163.866
24.778 0.010001646 164.5675
24.759 0.010001644 164.412
24.774 0.010001643 164.341
24.774 0.010001632 163.225
24.794 0.010001635 163.493
24.765 0.010001653 165.277
24.75 0.010001646 164.592
24.737 0.010001654 165.394
24.761 0.010001646 164.5955
24.775 0.010001651 165.089
24.79 0.010001653 165.254
24.775 0.010001664 166.4035
24.771 0.010001655 165.5265
24.783 0.010001659 165.897
24.832 0.010001658 165.811
24.822 0.010001646 164.5745
24.826 0.010001651 165.0605
24.837 0.010001662 166.174
24.834 0.010001654 165.3935
24.82 0.010001658 165.811
24.815 0.010001664 166.441
24.812 0.010001666 166.575
24.865 0.01000166 165.951
24.927 0.010001678 167.8385

Calculated measurement

Median value : 10.001637 mΩ
Median deviation: +163.7 ppm @ +24.77 °C
Standard deviation: 29.44 nΩ
Uncertainty: ±0.02 %
Date : 27 June, 2020

Leeds & Northrup 4221 100 mΩ and 4223-B 1 mΩ oil resistors

Same measurement setup.

L&N 4221 resistance standard

Median value : 100.05732 mΩ
Median deviation: +573.2 ppm @ +23.28 °C
Standard deviation: 43.9 nΩ
Uncertainty: ±0.02 %
Date : 26 June, 2020

L&N 4223-B resistance standard

Air temperature Calculated resistance Deviation from nominal, ppm
24.454 0.000999952 -47.962
24.443 0.000999954 -46.260
24.457 0.000999954 -45.944
24.457 0.000999952 -47.960
24.506 0.000999952 -47.505
24.515 0.000999952 -47.724
24.529 0.000999952 -48.200
24.541 0.000999952 -48.221
24.548 0.000999952 -48.165
24.582 0.000999953 -47.374
24.583 0.000999952 -48.206
24.565 0.000999953 -47.421

Median value : 0.9999522 mΩ
Median deviation: -47.8 ppm @ +24.52 °C
Standard deviation: 0.727 nΩ
Uncertainty: ±0.02 %
Date : 26 June, 2020

In future we will repeat measurements of all these resistors for temperature stability, using Fluke 7015 precision oil bath.

Author: Illya Tsemenko
Published: July 8, 2020, 2:49 a.m.
Modified: Aug. 14, 2020, 6:03 a.m.

References

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