RD-22 Dytronic Primary Transfer Standard
Features
Measurement Technology
The RD-22 utilizes Radian’s Dytronic measurement technology featuring a Radian designed Integrating Analog to Digital Signal Converter based upon a charge balance conversion principle. The RD-22 also employs a Radian electronically compensated concentric core current comparator transformer.
Transfer Accurate and Traceable Measurement
The 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 laboratory, such as National Institute of Standards and Technology.
Complete AC Electric Metrology
When used with RS-933 Laboratory Reference System the RD-22 serve as an active reference to provide complete AC electric metrology.
Overview
The RD-22 Primary Transfer Standard represents the state-of-the-art technology in a commercially available true DC to AC accuracy transfer reference. The RD-22 has typical AC measurement accuracies within the limits of traceability. Repeatability of 1 ppm can be attained at 120 V and 5 A inputs of specific models.
The RD-22 utilizes Radian’s Dytronic measurement technology featuring a Radian designed Integrating Analog to Digital Signal Converter based upon a charge-balance conversion principle. The RD-22 also employs a new Radian electronically compensated concentric core current comparator transformer.This current comparator is autoranging and external to the standard, allowing for non-galvanic current connection to the unit. These two new technologies combine with existing Radian features to provide the highest degree of accuracy, stability and versatility ever offered in a primary transfer standard.
The 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 Laboratory, such as the National Institute of Standards and Technology (NIST).
The RD-22 can also be tested by using external DC primary reference sets of voltage, current, and time. These external DC references can be compared directly to the RD-22’s internal reference sets. Additionally, the RD-22 can be used as the active reference to the Radian RS-933 Laboratory Reference System to provide a complete AC electric metrology lab.
The RD-22 provides four quadrant, single-phase simultaneous energy and power measurements. The potential input and current input are totally autoranging. This autoranging feature was pioneered by Radian Research and makes it impossible to damage the unit by applying a signal to the wrong tap. The potential input range is 60 to 600 V, the current input range is 0.2 to 125 A or 0.2 to 200 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.
The RD-22 can optionally analyze harmonic waveforms through the 150th harmonic order. A second option enables the RD-22 to automatically calculate and display the error of standards being tested. The analog sense option allows for testing of transducers and other devices that provide an analog current output instead of a digital pulse output. The RD-22 also provides a serial communications port for direct connection to the RS-232 serial port of a personal computer.
Technical Data
Package Contents |
|
| RD-22 Primary Transfer Standard | |
| RD-2x and RD-3x Manual CD | |
| RD-2x and RD-3x Getting Started Guide | |
| Cables | |
OPERATING RANGE
- Current Comparator (Autoranging)
- 0.2 to 125 amps per input (125 amp option)
- 0.2 to 200 amps per input (200 amp option)
- Input voltage: 60 to 600 volts (Autoranging)
- Auxiliary power converter input: 120 V or 240 V
- Auxiliary Power DC input: 24 volts nominal
- Frequency: 45 to 65 Hz
- Phase Angle: 0 to 360° or -180 to 180°
- Power Factor: -1 to 1 with no impact on accuracy
- Temperature: 18° to 30°C
- Humidity: 0% to 95% non-condensing
- Shock and vibration: Any that is not destructive
PHYSICAL DESCRIPTION
- Weight
- RD-22 + Current Comparator + Platform: 12 lbs (5.45kg)
- Auxiliary Power Input Converter: 3 lbs (1.36kg)
- Size
- RD-22: 190.5 mm (7.5") H x139.7mm (5.5") W x 139.7mm (5.5") D
- Platform: 19mm (0.75") H x 152.4mm (6"0 W x 508mm (20")D
- Backlit LCD, 4 line by 16 character
- Potential and Aux power inputs: 4mm Banana type jacks
- BNC (port 1) input/gating, time reference input
- BNC (port 2) pulse outputs
- BNC (port 3) three phase SYNC or analog sense
- 5 membrane button keypad: UP/DOWN/ESC-RESET/ENTER/MODE
- 8 pin RJ-45 jack for RS-232 communication
- Pickup input for direct interface to RR-DS, RR-1H, or RR-KYZ
- CCT input to external current comparator
TEST AND CALIBRATION
- No physical adjustments, all calibration performed with software
- 50 or 60 Hz calibration can be provided
- Orientation: Upright only
- Re-calibration interval: 365 days
- Warm up time: 60 minutes
ACCURACY
Accuracy specifications apply to all supported measurement functions using sinusoidal waveforms and across the entire operating range of the product between the temperatures of 18 to 30 C. Maximum guaranteed accuracy specification includes stability, traceability uncertainty, power factor, and test system errors.
Typical Accuracy: within traceability uncertainties
Guaranteed Accuracy: ±0.01%
DC to AC Transfer Accuracy: ±0.005%
PROTECTION
- Isolation: Complete: Input/output/power/case/control
- Dielectric withstand: 2.3 kVrms, 60Hz, 60 seconds
- Surge withstand: IEEE 472 and ANSI 37.90
- Fuses: #34.3117 for potential and auxiliary power
INPUTS (Port 1)
- Display Gate: BNC with 150 ohms pull up to 5 volts, clamped at 5.7 volts
- Gate Rate: 200 nS pulse width minimum, maximum 20 Hz repetition rate
OUTPUTS (Port 2)
- Type: BNC, Open collector, clamped at 27 volts (50mA max)
- Frequency: Max 2.1 MHz (200 nS pulse width minimum)
- Metrics: Selectable, i.e. Watt hours, Var hours, VA Hours, etc.
- Pulse value: Programmable (0.00001 Wh/pulse Default)
QUALITY
- Meets all applicable ANSI and IEC specifications
- Radian Research’s calibration procedures are in compliance with MIL-STD-45662A and ANSI/NCSL Z540-1-1994
- Radian Research’s primary transfer standards are traceable to NIST
- Radian Research’s quality system is ISO-9001 certified
- Warranty: Two years parts and labor
RD-22 Menu for Measurements & Functionality
The last three digits determine the model. The first of the last three digits determines the measurement functions. The second of the last three digits determines if the unit has a built-in comparator, harmonics analysis, and/or analog sense capability. The third of the last three digits determines the current comparator capacity.
| Specifying the first of the last three digits: RD-22-Xxx | |
| MODEL | MEASUREMENT FUNCTIONS |
| RD-22-0xx | Whrs, Volts, Amps |
| RD-22-1xx | Whrs, Volts, Amps, VARhrs |
| RD-22-2xx | Whrs, Volts, Amps, VARhrs, VAhrs, Qhrs, Phase Angle, Power Factor, Frequency |
| RD-22-3xx | Whrs, VARhrs, VAhrs, Qhrs, Volts, Amps, Watts, VARs, VA,Vhr, Ahr, V2hr, A2hr, Phase Angle, Power Factor, Frequency Min & Max measurements: All indicating functions |
| RD-22-4xx | Whrs, VARhrs, VAhrs, Qhrs, Volts, Amps, Watts, VARs, VA,Vhr, Ahr, V2hr, A2hr, Phase Angle, Power Factor, Frequency Min & Max measurements: All indicating functions AVG response: VAhrs, VA, Volts, Vhour, Amps, Ahour |
| Specifying the second of the last three digits: RD-22-xXx | |
| -x0x | No comparator, No harmonic analysis, No analog sense input |
| -x1x | Built-in comparator |
| -x2x | Harmonic analysis |
| -x3x | Built-in comparator and harmonic analysis |
| -x4x | Analog sense input (2 mA DC current maximum) |
| -x5x | Built-in comparator and analog sense input |
| -x6x | Harmonic analysis and analog sense input |
| -x7x | Built-in comparator, harmonic analysis, and analog sense input |
| Specifying the third of the last three digits: RD-22-xxX | |
| -xx1 | 125 Amp Maximum Current Comparator Transformer |
| -xx2 | 200 Amp Maximum Current Comparator Transformer |
Options:
RR-TAD Transconductance Amplifier and Precision Divider. For use with
Primary DC V & R. Used to convert Primary 10VDC cell into 3VDC for input
to the RD-22. Used to divide (2) 10K ohm Primary resisters for current input to the RD-22.
