6311A Precision Current Divider

  • 10A (100:1) and 300A (1000:1) ranges
  • No stabilization period
  • No power coefficient
  • No temperature coefficient
  • DC and AC Operation
Features & Benefits

Measurements International has developed the 6311A Precision Current Divider with the aim to replace/improve the outdated and often inaccurate Current Shunts being used. The 6311A is a 100:1 and 1000:1 Current Divider that works on the principal of the world renowned MI Resistance Bridge and Extenders. Traditional Current Shunts suffer from temperature stabilities and the power coefficient issues that greatly affect the users ability to make accurate measurements. The current transformer used in 6311A has no such issues. Simply apply power and measure the divided output. The 100:1 range has a maximum current of 10A and the 1000:1 range has a maximum current of 300A. Both ranges can accept both DC and AC current to 1kHz with uncertainty of < 5 and < 20 parts in 106  respectively. In comparison, a DC Shunt will have a calibration uncertainty of 0.01% or larger in most cases.

Since 1993, MI has earned a worldwide reputation for Dependability, Quality and Performance. The 6311A uses the ratio of two sets of winding on a DC Current Comparator (DCC) to measure.

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% 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 Approximately 1/20th of a traditional Current Shunt

6311A Graph 1

6311A Graph 2

A new technical paper showing the comparison of shunts to current divider technology has been released. To read, follow the link below.



Rating (Amps) Resistance (Ohms) Power Rating (Watts) Time Constant (s) DC Accuracy AC Accuracy (±μA/A) Stability (±μA/A) Temperature Coefficient (± μA/A/°C) Power Coefficient (±μA/A/W)
Typical Shunt 10 0.1 10 > 600 0.0001% No spec 10 4 4
Typical Shunt 300 0.001 100 > 600 0.01% No spec 10 4 4
6311A 10 0 N/A < 10 < 0.0005% < 20 0.05 0 0
6311A 300 0 N/A < 10 < 0.0005% < 20 0.05 0 0


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