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Measurements International has developed the 6311A Precision Current Divider with the aim of replacing the outdated and often inaccurate Current Shunts being used as well as improving the overall measurement of both DC and AC current. The Model 6311A offers a simple and accurate method to measure currents without the significant drawbacks incurred when using a resistive current shunt. Traditional Current Shunts suffer from large temperature and power coefficients that affect stability and require a long period where the element needs to stabilize at any specific current. 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 to measure, the current is accurately divided by either 100:1 or 1000:1, providing a more manageable signal to measure.
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. In comparison, a DC Current Shunt will have 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 |
A new technical paper showing the comparison of shunts to current divider technology has been released. To read, follow the link below.
Improving the Uncertainty of DC Current Measurements
| 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 to 28 °C | |||||||||
| Operating Humidity | 20 % to 70 % RH | |||||||||
| Warranty | Standard 2 Year Parts and Labour | |||||||||
