RADIAN RD-22 Ultra  

01.

The technology utilized in the Ultra Stable RD-22 is based on RADIAN’s Dytronic measurement system featuring a RADIAN designed Integrating Analog to Digital Converter based on a charge-balance conversion principle. The potential input contains a newly designed potential transformer and range switching design optimized for120/240 V operation. The Ultra Stable RD-22 also employs the Radian electronically compensated concentric core current comparator with a fixed winding around the core to optimize repeatability and reproducibility on the current input. These new technologies combine with existing Radian features to provide the highest degree of accuracy, stability and versatility offered in a primary transfer standard.

The Ultra Stable RD-22 can be used to transfer accurate and traceable measurements from Radian Research’s calibration laboratory. Alternatively, it can be calibrated directly by a National Metrology Institute such as the National Instituted of Standards and Technology (NIST). The same low temperature coefficients of the traditional RD-22 are achieved by Ultra Stable RD-22. Each Ultra Stable RD-22 Calibration Report comes with the temperature coefficients for the twelve cardinal test points, 120/240V at 5A at 50/60 Hz at unity and 0.5 lead and lag power factors. The temperature coefficients are typically below 2ppm/K.

Four quadrant, single-phase simultaneous energy and power measurements are provided by Ultra Stable RD-22. The potential input is autoranging between 120 and 240V. This autoranging feature was pioneered by Radian Research. The potential input ranges are 120 V ±15% (102 V to 138 V) and 240 V ±15% (204 V to 276 V) with a maximum input voltage of 276 V. The current input range is 5 A ±15% (4.25 A to 5.75 A ). The external auxiliary power input converter provides 24 V DC to the auxiliary power input of the RD-22. The external auxiliary power converter minimizes 60/50 Hz line frequency interference from coupling to the measurement circuitry.

Optionally the Ultra Stable RD-22 can analyze harmonic waveforms through the 50th harmonic order. A second option enables the Ultra Stable RD-22 to automatically calculate and display the error of standards being tested. A serial communication port for direct connection to the RS-232 serial port of a personal computer is also provided.