The model 2600A provides ultra precise ratio division of AC currents. Based on current comparator technology, the 2600A is developed as a means of calibrating optical and non-conventional current transformers. It also provides an easy means of interfacing directly to precision voltage input wattmeters for direct measurements of transformer losses under IEEE-488 control. The input to the model 2600A normally comes from the output of an AC Current Transformer.
Inputs up to 5 Amps are available on the 2600A. (Other inputs are available.) The 2600A has several gain ranges of 1, 2, 5, 10, 20, 50 & 100 for amplifying low current inputs while maintaining full range accuracy. The current comparator provides a means to automatically correct for magnitude and phase errors without requiring adjustment controls. On range 1, the full-scale input is 5 A. On range 100, the full-scale input is 50 mA. The full-scale output is 10 Volts. The secondary output provides 1 Volt full scale. Recommended calibration for the 2600A is 3 to 5 years.
The Transimpedance Amplifier is a current to voltage converter consisting of an input current transformer with resistive shunt to obtain a voltage proportional to, and in phase with the primary current. It provides ultra precise ratio divisions of AC currents with accuracies to ≤ 20 ppm. The stability and accuracy of the Transimpedance are determined by the basic accuracy of the input current transformer and current comparator.
Current extensions to 2000 Amps are available with Measurements International’s model 7020 Precision Current Transformer.
Block Diagram For Use in Loss Measurement System
|Input Current||5 Amps Maximum|
|Gain Setting||1, 2, 5, 10, 20, 50, 100|
|Primary Output||Maximum Output Voltage: 10 Vac RMS|
|Division Ratio Uncertainty*||In Phase ± 20 ppm, Quadrature ± 20 ppm|
|Secondary Output||Maximum Output Voltage: 1 Vac RMS|
|Division Ratio Uncertainty*||In Phase ± 0.005 %, Quadrature ± 0.005 %|
|Frequency Range||40 Hz to 1000 Hz|
|Output Terminals||5 Way Binding Posts|
|Rack Mounting||Standard 483 mm|
|Operating Environment||18 to 34 °C, 10 to 80 % RH|
|Warranty||1 Year Parts & Labour|
* At 50 or 60 Hz