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  RD-30 Dytronic Three-Phase Reference Standard


RX Screens

Light Weight, Compact... Metrology capability
in Power and Energy Measurement that is
surpassed by none!

Designed for Safety Compliance Operator safety is always a concern of our customers. RX is designed to meet the requirements defined in recognized product safety standards. RX users can be assured that when designing the RX, user safety was a top concern and has been enhanced with this new reference standard.

Extraordinarily Versatile Uncompromised power and energy performance over a broad measurement range in a single rugged solution. Whether integrated within a field test box, stationary test rack or used as an engineering lab tool, the RX is extraordinarily versatile. Whatever your requirement RX can fill your need.

Expanded 17025 Lab Accreditation Customer Service & Support brand loyalty is built on trust developed over the past 35 years of uncompromised product design and manufacturing. Customers world-wide have proven this performance for themselves. Those considering Radian products for the first time can gain assurance from our industry leading measurement uncertainties backed by A2LA, an independent 17025 accreditation assessment agency. See latest scope of lab accreditations at

Maximize Signal Processing The RX uses the latest Digital Signal Processing (DSP) technology incorporating nine high speed 1,000,000 samples/second A/D converters. In addition, the flexibility of frequency domain processing algorithms optimizes measurements for the specific signal parameters of interest.



Radian Research is committed to providing our customers with leading innovative and technologically superior products, while maintaining metrology capability in power and energy measurement that is surpassed by none. Our engineers drew on the expertise and knowledge we acquired for our industry-leading legacy RM (Metronic) and RD (Dytronic) reference standards to develop the RX (Xytronic), the ultimate in power and energy measurement technology perfection.

Extended Measurement Range The RX is designed to operate over a broad Current, Voltage and Power Factor measurement range. A dynamic range of 30 VAC - 600 VAC and 1 mA – 200 A provides the versatility to operate in a multitude of power and energy applications. The AC direct current input provides fixed impedance (0.0005 Ohm) over the entire AC current input range. This capability is key to applications that require a fixed input burden and accurate yet fast measurement speed. The RX provides three-phase fully auto-ranging, simultaneous four-quadrant precision measurements, computes, records and presents instantaneous metrics. The RX allows the user to do more with a single instrument.

Internationalization The RX is designed for a global market where user languages may vary. The RX accommodates different languages as well as selectable VAR calculations and a broad range of energy measurement metrics including fundamental only Watts, VA and VAR. RX VAR calculation modes include Voltage 90 degree shifted, Integral VAR, Integral VAR 50 Hz, Integral VAR 60 Hz, RMS VAR, and Fundamental VAR.

Accurate in Extreme Environments Most Power and Energy reference standards are designed to maintain accuracies in a temperature controlled laboratory environment. Not the RX, it is at home in a temperature controlled measurement lab and at a test site where the environment is outside the operator’s control. Radian’s confidence in the RX design is supported by the guarantee that it will meet class accuracy at specified temperature extremes. You can test with confidence when using the RX.

Technical Data



4.5”(114mm), 15.5” (394 mm), 7.5” (190 mm)
15 lbs (6.8 kg), Shipping weight 24 lbs (10.8 kg)


Ambient Temperature Range

Supply Voltage
Power Consumption
Typical AC/DC Power Supply

Storage... -40 ºC to +80 ºC
Operating... -20 ºC to +65 ºC
Specified Accuracy... 0 ºC to 40 ºC
0% to 95% Non-condensing
All Non-destructive
24 Vdc + 10%
~25 VA max.
AC Input 100 to 240V, 50 to
<60 Seconds


IP Class
International Compliance CE directives:

Overvoltage Category Voltage Measurement
Overvoltage Category Current Measurement
Hi-Pot & Surge
Fused Potential Input

IP30 (According to DIN EN 60529)
Low Voltage 2014/35/EU (IEC 61010-1, -2-030)
Electromagnetic Compatibility 2014/30/EU (IEC 61326-1, -2-1)
ROHS 2 2014/30/EU
IEC 61010-1
500 mA Ultrafast - SIBA or Equivalent


Touch Screen Color Display:

I/O Ports:
Communication Interface Port / Protocol


External Monitor Port
External Touch Screen Port
Optical Sensor Port
Output Reference Clock

Integrated 4.3”, Backlit LCD Color Screen (Optional External Touch Screen Display Available)

Serial RS-232 / Supports Radian Legacy RD Commands Ethernet / Standard Commands for Programmable Instrumentation (SCPI) Protocol
Internal (Max. Storage 2,000 Mbytes)
External SD (Max. Storage 32 Gbytes)
External USB

Front Panel Video (Optional Monitors Available)
USB 2.0
4 Pin Lemo (Optional Optical Accessories Available)
10/20 MHz selectable, 5V TTL compatible


CT Ports

Bidirectional Programmable Pulse/
Frequency Comparator BNC Ports

Outputs 1, 2, 3 & 4: (Default = 0.00001 Wh/Pulse)

Direct AC Current (I) Inputs

Indirect Current (External CT Input)

Potential (U) fused Inputs

Cable Accessories

Analog Sense (RX-AS) Option

See Radian Web Site for available compensated and uncompensated current clamps

Input Termination 128 Ohm/1 KOhm Pull Up to 5 V, Max External Pullup +27V Input Gate rate 200 nS Pulse Width Minimum, Maximum 20 Hz Repetition Rate

Short Circuit Tolerant. Programmable Kh Value Nominal 5 V, Open Collector Compatible, Max. 27V
Max. 2.1 MHz (200nS Pulse Width Minimum) Selectable Watt Hours, VAR Hours, VA Hours

Range: 1 mA to 200 Amp <500µOhm Input Impedance Termination: 6 mm Female (<120 Amp) or Male CONLOC (< 200 Amp), Optional Current Cable Termination and Adapters available

Max. input: 1 Amp
Termination: 7 Pin Female Redel Connector

Range: 30 V to 600 V (60Hz), 30 V to 525 V (50Hz)
1M Ohm Input Impedance
Termination: 4 mm Female
Protection: 500mA Fused

Legacy cable locking adapters (supplied)
AC to 24 DCV Converter (supplied)
3 pair 1m Potential Cables (supplied)
Unterminated 120A or 200A Locking Current Cables (Optional)

-20mA to +20mA DC max., BNC Input, Accuracy 0.02% + 1µA

1TCAL = 23 ºC
2 1mA to <20mA Derated to 0.02%
3 Total Expanded Uncertainty in accordance with ISO/IEC Guide 98-3:2008
   Includes variables of Stability, Crosstalk, and Traceability Uncertainty
   Accuracy represents expanded uncertainties expressed at the 95 % level
   of confidence using a coverage factor of k = 2
4 For Power Factor < 0.5, ± (0.005% / PF) Maximum
5 For 1 Second Test Time
6 Maximum 30 V to 525 V at 50 Hz
7 Maximum 0 ºC to +40 ºC
8 For Power Factor = 1 Cal Uncertainty = 30 ppm
9 Related to Active Power with Power Factor from 1 to 0.5i and from 1 to 0.5c


Optical Pickup

Pulse Input Adapter with 4-Pin plug

Disk Sensor

Cables and Leads


Current Probes




Arrow RX-33 Xytronic Three-Phase Reference Standard Brochure
Arrow Application Note - SCPI Console Overview for Use with the Radian RX Xytronic Standard
Arrow Application Note - Changing the Pulse Ports on a RX Standard Using SCPI
Arrow SCPI Console Download
Arrow SCPI Console Example Application
Arrow PC-Suite Upgrade Download

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