Measurements International replaced the outdated current shunts with the 6311A Precision Current Divider, which improves both the DC and AC current measurements . The 6311A offers a simple and accurate method to measure currents without the significant drawbacks of using a current shunt. Traditional current shunts suffer from large temperature and power coefficients, affecting stability and requiring a longer stabilization period. The current transformer used in the 6311A has no such issues; simply apply power and measure the divided output.
The 6311A builds upon the world-renowned DC Current Comparator (DCC) that is the heart of every MI resistance bridge and range extender. Leveraging two sets of primary windings of a DCC, the current is accurately divided by either 100:1 or 1000:1, providing a more measurable signal.
The 10A max range divides the input current by 100 range while the 300A max range divides the input current by 1000. Both ranges can accept both DC and AC current to 1 kHz with an uncertainty of < 5 and < 20 parts in 106 respectively. Comparatively, a DC current shunt has a calibration uncertainty of 0.01 % or larger in most cases.
| Feature | Benefit |
| No temperature coefficient | Reduces uncertainty |
| No stabilization period | Measurements can be made immediately |
| No power coefficient | No error difference from 5 % to 100 % of range |
| AC/DC | Works at DC and AC up to 1kHz |
| CT/Current Divider | Current In is divided by either 100 or 1000 |
| < 5 ppm (DC) / 20 ppm (AC) | ∼ 20 times less than a traditional Current Shunt |
Read the technical paper, Improving the Uncertainty of DC Current Measurements, showing the comparison of shunts to current divider technology.
| Min. Input (A) | Max. Input (A) | Division Ratio | Accuracy (µA/A) | Frequency Range (Hz) | Stability 12 Month (CA/A) | Time Constant (s) | TC (µΩ/°C) | Power Coefficient (µΩ/W) | ||
| Range | DC | AC | ||||||||
| 10 A | 0.1 | 10 A | 100:1 | < 5 | < 20 | 10 to 1000 | < 0/05 | < 10 | 0 | 0 |
| 300 A | 3 | 300 A | 1000:1 | < 5 | < 20 | 10 to 1000 | < 0.05 | < 10 | 0 | 0 |
| Operating Temperature | 23 °C ± 5 °C | |||||||||
| Ambient Temperature Range | 18 °C – 28 °C | |||||||||
| Operating Humidity | 20 % – 70 % RH | |||||||||
| Warranty | Standard 2 Year Parts and Labour | |||||||||
1-800-324-4988
613-925-5934
Measurements International Ltd.
PB 2359, 118 Commerce Drive,
Prescott, Ontario, Canada K0E 1T0
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