Product Highlights
The RX-20 series puts setup, live readings, and test results on a built-in touchscreen, with an optional external touchscreen or monitor for test racks. Results can be saved to internal memory, an SD card, or a USB drive.
For automated systems, the RX-20 series connects through Ethernet (SCPI) and RS-232, which supports RADIAN legacy RD commands, so it can replace an older RADIAN standard in an existing test system. Four bidirectional pulse ports, an optical pickup port, and a CT input for external current probes cover meter testing in the shop and the lab.
Precision Perfected with RADIAN
RADIAN RX-20
The RADIAN RX-20 provides ±0.04% energy accuracy (±0.02% at unity power factor) for single-phase meter testing in the shop and the lab. Its accuracy is specified from -20 °C to +65 °C.
Performance Highlights
• Energy and power accuracy: ±0.04% (±0.02% at unity PF)
• Voltage accuracy: ±0.02%
• Current accuracy: ±0.028%
• Phase angle accuracy: ±0.008°
• Stability: 0.0016% × √month
• Energy temperature coefficient: 0.0005%/°C
• Specified accuracy: -20 °C to +65 °C
• Single-phase reference standard
RADIAN RX-21
The RADIAN RX-21 delivers ±0.02% energy accuracy (±0.01% at unity power factor), a tighter uncertainty class for shops and labs that test to closer limits. Like the RX-20, its accuracy is specified from -20 °C to +65 °C.
Performance Highlights
• Energy and power accuracy: ±0.02% (±0.01% at unity PF)
• Voltage accuracy: ±0.01%
• Current accuracy: ±0.014%
• Phase angle accuracy: ±0.005°
• Stability: 0.0008% × √month
• Energy temperature coefficient: 0.0005%/°C
• Specified accuracy: -20 °C to +65 °C
• Single-phase reference standard
RADIAN RX-23
The RADIAN RX-23 provides ±0.01% energy accuracy (±0.005% at unity power factor), the highest class in the RX-20 series. It suits lab use and checking other reference standards, with accuracy specified from 0 °C to 40 °C.
Performance Highlights
• Energy and power accuracy: ±0.01% (±0.005% at unity PF)
• Voltage accuracy: ±0.005%
• Current accuracy: ±0.007%
• Phase angle accuracy: ±0.003°
• Stability: 0.0004% × √month
• Energy temperature coefficient: 0.0005%/°C
• Specified accuracy: 0 °C to 40 °C
• Single-phase reference standard
Features
- Accuracy classes of ±0.04% (RX-20), ±0.02% (RX-21), and ±0.01% (RX-23), traceable to NIST.
- 4.3-inch color touchscreen, with an optional external touchscreen or monitor.
- Autoranging from 30 to 600 V and 1 mA to 200 A on one direct current input, plus a CT input for external current probes.
- Ethernet (SCPI) and RS-232 with RADIAN legacy RD commands for automated test systems.
- Four bidirectional pulse ports, an optical pickup port, and a 10/20 MHz reference clock output.
- Slim, rack-width body at 7.5 lb (4.5 × 15.5 × 7.5 in) for test racks and lab benches.
- Backed by RADIAN's ISO/IEC 17025 accreditation.
Dependable Shop and Laboratory Meter Testing
- In a stationary test rack: Ethernet (SCPI), RS-232, and an optional external touchscreen or monitor let the standard run inside an automated system.
- On the lab bench: the RX-23 at ±0.01% works as an engineering lab tool and for checking other reference standards.
- Anywhere: results save to internal memory, an SD card, or a USB drive.
Which RADIAN Single-Phase Standard Is Right for You?
The RX-20 and RX-10 series share the same accuracy classes and Xytronic measurement technology. Choose by how you work: the RX-20 series for touchscreen operation in test racks and on the lab bench, or the RADIAN RX-10, RX-11, and RX-15 for a rugged cube with three series/parallel current inputs.
Testing three-phase circuits? See the RADIAN RX-30, RX-31, and RX-33.
| RX-20, RX-21, RX-23 | RX-10, RX-11, RX-15 | |
|---|---|---|
| Accuracy | ±0.04%, ±0.02%, ±0.01% | ±0.04%, ±0.02%, ±0.01% |
| Interface | 4.3-inch color touchscreen | Five-button interface |
| Current input | One direct input, 1 mA–200 A, plus a CT input | Three 75 A inputs, series or parallel, 20 mA–225 A |
| Form | Slim, rack-width body, 7.5 lb | Rugged cube |
| Best for | Test racks and lab benches | Field and shop testing, including series-parallel testing |
Technical Specifications
Accuracy
| RX-20 | RX-21 | RX-23 | |
|---|---|---|---|
| Power and energy, 0.5 lag to 1 to 0.5 lead | ±0.04% | ±0.02% | ±0.01% |
| Power and energy at unity power factor | ±0.02% | ±0.01% | ±0.005% |
| Power and energy, 5 mA to <20 mA | ±0.08% | ±0.04% | ±0.02% |
| Voltage, 30 V to 600 V (525 V at 50 Hz) | ±0.02% | ±0.01% | ±0.005% |
| Current, 20 mA to 200 A | ±0.028% | ±0.014% | ±0.007% |
| Current, 5 mA to <20 mA | ±0.056% | ±0.028% | ±0.014% |
| Phase angle | 0.008° | 0.005° | 0.003° |
| Frequency, 45 Hz to 75 Hz | ±0.0001% | ±0.0001% | ±0.0001% |
| Repeatability | 0.0001% ÷ √(test time in seconds) | 0.0001% ÷ √(test time in seconds) | 0.0001% ÷ √(test time in seconds) |
Accuracy is stated in percent of reading at 23 °C ±5 °C, as expanded uncertainty at 95% confidence (k = 2), and includes stability, crosstalk, and traceability uncertainty. Repeatability is already included in the accuracy figures. Power and energy accuracy applies to tests of 1 second or longer. Below 0.5 power factor, power and energy accuracy is ±(0.01% ÷ PF) maximum for the RX-20 and RX-21 and ±(0.005% ÷ PF) for the RX-23.
Stability and Temperature
| RX-20 | RX-21 | RX-23 | |
|---|---|---|---|
| Stability, power and energy (× √month) | 0.0016% | 0.0008% | 0.0004% |
| Stability, voltage (× √month) | 0.0008% | 0.0004% | 0.0002% |
| Stability, current (× √month) | 0.0012% | 0.0006% | 0.0003% |
| Temperature drift, power and energy | 0.0005%/°C | 0.0005%/°C | 0.0005%/°C |
| Temperature drift, voltage | 0.00015%/°C | 0.00015%/°C | 0.00015%/°C |
| Temperature drift, current | 0.0003%/°C | 0.0003%/°C | 0.0003%/°C |
| Specified temperature range | −20 to +65 °C | −20 to +65 °C | 0 to +40 °C |
| Operating temperature range | −20 to +65 °C | −20 to +65 °C | −20 to +65 °C |
| Storage temperature range | −40 to +80 °C | −40 to +80 °C | −40 to +80 °C |
| Humidity | 0% to 95%, non-condensing | 0% to 95%, non-condensing | 0% to 95%, non-condensing |
Harmonics and Measurement
| RX-20, RX-21, and RX-23 | |
|---|---|
| Measurement bandwidth | 3,840 Hz (to the 64th harmonic at 60 Hz) |
| Harmonics | Harmonic accuracy matches the RX-30, RX-31, and RX-33 respectively |
| Measurement modes | Broadband (all harmonics) or fundamental only |
| Sampling | Nine 1 million samples-per-second A/D converters |
| Voltage input | 30 V to 600 V at 60 Hz (30 V to 525 V at 50 Hz), 1 MΩ input impedance, 500 mA fused |
| Current input | 1 mA to 200 A on one direct input, so there is no range switching across the full span; input impedance less than 500 µΩ |
| External CT input | Up to 1 A, 7-pin connector, for compensated and uncompensated current clamps |
| Analog sense (RX-AS option) | −20 mA to +20 mA DC, BNC input, accuracy 0.02% + 1 µA |
Automation and Interfaces
| RX-20, RX-21, and RX-23 | |
|---|---|
| Integration time | 0.5 seconds by default, adjustable in 0.5-second steps in PCSuite. Integration time is how long each reading is measured; it is separate from the test time. |
| Ethernet | SCPI commands (see the SCPI application note) |
| RS-232 | RADIAN legacy RD commands |
| Pulse ports | 4 bidirectional, programmable BNC ports; outputs up to 2.1 MHz, selectable Wh, VARh, or VAh |
| Optical sensor port | 4-pin connector for optional optical pickups |
| Reference clock output | 10 MHz or 20 MHz, selectable |
| Display | 4.3-inch color touchscreen, with an optional external touchscreen (USB) or monitor |
| Data storage | Internal memory (2 GB), SD card (up to 32 GB), or USB drive |
| Warm-up | Less than 60 seconds |
Physical, Safety, and Calibration
| RX-20, RX-21, and RX-23 | |
|---|---|
| Power | 24 V DC from the supplied AC/DC converter (100 V to 240 V, 50/60 Hz input); about 25 VA maximum |
| Dimensions | 114 × 394 × 190 mm (4.5 × 15.5 × 7.5 in) |
| Weight | 3.4 kg (7.5 lb) |
| Maximum altitude | 2,000 m |
| Ingress protection | IP30 (DIN EN 60529) |
| Safety | IEC 61010-1 |
| Recommended calibration interval | 1 year |
| Traceability | NIST-traceable, with optional ISO/IEC 17025 accredited calibration |
| ISO/IEC 17025 calibration uncertainty | Voltage ±0.003%; current ±0.005%; power and energy ±0.005%, or ±0.003% at unity power factor; frequency ±0.000005% |
| Calibration documents | Sample single-phase calibration report (RX-10) and ISO/IEC 17025 scope |
| Brochures | RX-20/RX-21 Brochure and RX-23 Brochure |
RX-20 Series FAQ
How is the RX-20 series different from the RX-10 series
Both are single-phase standards with the same accuracy classes. The RX-20 series uses a 4.3-inch color touchscreen and a slim, rack-width body that fits test racks and lab benches, with one direct current input from 1 mA to 200 A. The RX-10 series uses a rugged cube with a five-button interface and three 75 A inputs that can be wired in series or parallel.
What does the RX-20 series measure
Each model measures watts, watthours, volts, amps, VARs, VAR-hours, VA, VA-hours, phase angle, power factor, frequency, volt-hours, amp-hours, V²h, and A²h, with minimum, maximum, and average response.
Can the RX-20 series replace an older RADIAN standard in my test system
It depends on the application. The RS-232 port supports RADIAN legacy RD commands, and Ethernet supports SCPI, but whether the RX-20 series can replace an older standard depends on how your test system uses it. Contact RADIAN to review your application.
Can the RX-23 be used to check other reference standards
Yes. At ±0.01%, the RX-23 is four times more accurate than the RX-20, which meets the common 4:1 accuracy ratio for checking a working standard. Learn more in How Accurate Does Meter Test Equipment Need to Be?
How is the RX-20 series kept accurate
The recommended calibration interval is one year. RADIAN Calibration Services recalibrates your standard with traceable, accredited calibration (see our certifications and accreditation), and RADIAN Care Plans combine scheduled recalibration with extended warranty coverage.
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