TYPICAL ACCURACY = +/- 0.005%
WORST CASE = +/- 0.02%
PRODUCT HIGHLIGHTS: The Radian RD-21 Single-phase Electricity Reference Standard is one of the most versatile reference instruments ever. The RD-21 has a typical accuracy of 0.005% for all measurement functions across its entire operating range, with a maximum worst case accuracy of 0.02%. This worst case accuracy specification includes the variables of stability, power factor, traceability uncertainty and test system errors.
The RD-21 utilizes Radian’s new Dytronic measurement technology consisting of a Radian designed Integrating Analog to Digital Signal Converter. Unlike off-the-shelf A/D Converters used in other instruments, Radian’s A/D Converter is specifically designed and optimized for power and energy measurement. This unique design makes the RD-21 absolutely unsurpassed in its ability to accurately measure “real world” waveforms. The RD-21’s A/D Converter is combined with Radian’s renowned electronically compensated voltage and current input transformers and a hermetically sealed reference set to provide the highest degree of accuracy, stability and versatility offered in a portable single-phase standard.
ANALOG SENSE: The optional analog sense feature enables testing of transducers and energy meters that provide an analog current output from zero to 2 mA.
MEASUREMENTS: The RD-21 is a four quadrant single-phase, simultaneous measuring instrument that registers both forward and reverse energy flow and provides voltage, current, power and energy (Active, Reactive, Apparent) information. The Harmonic Analysis option makes available the analysis of customer load though the 50th harmonic order while the Built-in Comparator option provides for the automatic calculation of test results for the meters and standards being tested.
METER AND STANDARD TESTING: The compact design of the RD-21 makes it an ideal reference standard for field testing applications where optimal accuracy is required. The RD-21 can be used with a controlled current source to test revenue meters and reference standards. In field applications the RD-21 can perform a single-phase meter accuracy test using existing service load. Pickups to sense meter disk rotation or calibration pulses of infrared, visible light, or KYZ signal plug directly into the standard. The RD-21 is ideal for testing high end energy meters found in power plants, substations, inter-tie points and at large utility customer accounts. The RD-21 may serve as a secondary standard to test portable field standards or standards within meter test benches. The RD-21 is also ideal to be integrated as the reference standard within a meter test bench.
INTUITIVE USER INTERFACE: The RD-21’s LCD and five-button keypad provides a direct interface to the end user while the RD-21’s RS-232 port, utilized with the applicable software, allows for remote PC control and configuration of the RD-21. Utilizing the five-button keypad and observing the LCD, the user is able to scroll through the various measurement functions of the RD-21 and toggle between the different menu screens. The amount of measurement information and the number of menu screens viewable is determined by the model number of the RD-21.
MENU SCREENS: The key menu screens are the Measurement Screens, Run Test Screen, Harmonics Screen, and Setup Screen.
The Measurement Screens will display the measurement functions the RD-21supports. There are different screens for Instantaneous Measurements, Accumulating Measurements, and Minimum & Maximum Measurements. Using the keypad, it is very simple to toggle between the various measurement screens and to scroll through the various measurement functions.
The Main Menu Screen allows users to gain access to the specific functionality of their RD-21. From the Main Menu, the user may select to run a meter, standard, or analog sense test, perform harmonics analysis, set-up/configure their RD-21, perform a self test, and review information pertinent to their RD-21.
The Run Test Screen allows the user to select the type of test they would like to run and then to enter the different variables for that specific test.
In the Harmonics Screen the user may select to view voltage or amperage harmonics, scroll through the harmonic order to observe the phase and magnitude of a specific harmonic, and view the total harmonic distortion.
The Setup Screen allows the user to custom configure their RD-21. The options available are changing the operation of the BNC ports, enabling or disabling the backlit display, selecting RMS or AVG measurement response, disabling or enabling the RD-21’s audible beeps, auto-scrolling the screens, and returning the RD-21 to its original factory default settings.
The above features and functions may also be utilized via a PC running Radian Software packages. RR-Configure/Analyze allows for the custom configuration of the RD-21 along with data analysis and RR-Kit software is a set of commands, routines, and instructions for custom application development.