The Keysight U2021XA is a high-performance USB peak and average power sensor designed to operate over a wide frequency range of 50 MHz to 18 GHz. Featuring a fast rise time of 13 ns and a wide video bandwidth of 30 MHz, the U2021XA is optimized for peak power measurements on complex modulated signals, such as LTE, wireless LAN, and radar pulses, without requiring a separate power meter.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | USB 2.0 (USBTMC-USB488), Micro-B connector with locking screws |
| Display | None (requires PC or compatible Keysight host instrument) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | USB Bus Powered, 5 VDC ± 5%, < 500 mA (2.5 W max) |
| Operating Temperature | 0 to 55 °C |
| Dimensions (W×H×D) | 46 mm × 36 mm × 164 mm |
| Weight | 0.25 |
Measurement Ranges & Power Specifications
| Parameter | Value |
|---|---|
| Frequency Range Minimum | 50 MHz |
| Frequency Range Maximum | 18 GHz |
| Power Measurement Range (Average Mode) | -45 to +20 dBm |
| Power Measurement Range (Normal/Peak Mode) | -30 to +20 dBm |
| Maximum Continuous Input Power | +23 dBm (200 mW) |
| Maximum Peak Input Power | +30 dBm (1 W) for < 1 µs |
| Maximum DC Input Voltage | 5 VDC |
Sensor Technology & Architecture
| Parameter | Value |
|---|---|
| Sensor Detection Type | Diode |
| Video Bandwidth | 30 MHz |
| Rise Time | ≤ 13 ns |
| Fall Time | ≤ 13 ns |
| Minimum Pulse Width | 50 ns |
| Dynamic Range | 65 dB (average mode), 50 dB (normal mode) |
RF Port Characteristics
| Parameter | Value |
|---|---|
| Input Impedance | 50 Ω |
| RF Connector Type | N-type |
| Connector Sex | Male |
| Maximum SWR (50 MHz to 2 GHz) | 1.15 |
| Maximum SWR (2 GHz to 10 GHz) | 1.20 |
| Maximum SWR (10 GHz to 18 GHz) | 1.25 |
Triggering & Sampling
| Parameter | Value |
|---|---|
| Maximum Sampling Rate | 80 MSamples/s |
| Internal Trigger Level Range | -20 to +20 dBm |
| Trigger Delay Range | ±1 s |
| Trigger Jitter | ≤ 1 ns |
| Time Resolution | 12.5 ns |
Environmental Parameters
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 to +70 °C |
| Operating Humidity Range | Up to 95% RH at 40 °C (non-condensing) |
| Maximum Operating Altitude | 3,000 meters |
Meter Compatibility & System Integration
| Parameter | Value |
|---|---|
| Recommended Calibration Cycle | 1 year |
Measurement Performance
| Parameter | Value |
|---|---|
| Measurement Speed (Buffered) | > 25,000 readings/s |
| Data Buffer | 250,000 readings |
| Automatic Pulse Measurements | Duty cycle, pulse width, pulse period, rise time, fall time, pulse top, pulse base, overshoot, undershoot |
Triggering
| Parameter | Value |
|---|---|
| Trigger Sources | Internal, External, Software, Bus |
| External Trigger Input | SMB connector, 10 kΩ input impedance, TTL compatible |
| External Trigger Output | SMB connector, 50 Ω output impedance, TTL compatible |
| External Trigger Input Voltage (High) | > 2.0 V |
| External Trigger Input Voltage (Low) | < 0.8 V |
| External Trigger Output Voltage (High) | > 2.4 V |
| External Trigger Output Voltage (Low) | < 0.4 V |
| External Trigger Latency | 30 ns |
Connectivity & Software
| Parameter | Value |
|---|---|
| USB Interface | USB 2.0 High Speed (USB-TMC compliant) |
| Command Language | SCPI |
Power Requirements
| Parameter | Value |
|---|---|
| Power Input | 5 V ± 10% |
| Maximum Current | 450 mA |
Calibration
| Parameter | Value |
|---|---|
| Zeroing and Calibration | Internal zeroing and calibration |
Accuracy
| Parameter | Value |
|---|---|
| Linearity (Average-only Mode, 15 to 35 °C) | ±0.8% |
| Linearity (Average-only Mode, 0 to 55 °C) | ±1.3% |
| Linearity (Normal Mode, 15 to 35 °C) | ±4.0% |
| Linearity (Normal Mode, 0 to 55 °C) | ±4.5% |
| Zero Set (Average-only Mode) | 2.5 nW |
| Zero Set (Normal Mode) | 250 nW |
| Zero Drift (Average-only Mode) | 1.0 nW |
| Zero Drift (Normal Mode) | 100 nW |
| Measurement Noise (Average-only Mode) | 2.5 nW |
| Measurement Noise (Normal Mode) | 250 nW |
Performance
| Parameter | Value |
|---|---|
| Timebase Frequency Accuracy | ±20 ppm |
Connectivity
| Parameter | Value |
|---|---|
| USB Protocol Speed | USB 2.0 High Speed |
| USB Device Class | USBTMC-USB488 |
Power
| Parameter | Value |
|---|---|
| Typical Power Consumption | 1.8 W |
| Maximum Power Consumption | 2.3 W |
| Typical Current Consumption | 360 mA |
Environmental
| Parameter | Value |
|---|---|
| Shock Resistance | MIL-PRF-28800F Class 3 |
| Vibration Resistance | MIL-PRF-28800F Class 3 |
Compliance
| Parameter | Value |
|---|---|
| Safety Compliance | IEC 61010-1, CAN/CSA-C22.2 No. 61010-1, ANSI/UL 61010-1 |
| EMC Compliance | IEC 61326-1, EN 61326-1, AS/NZS CISPR 11, ICES/NMB-001 |
Technology
Diode-based Peak and Average Power Sensor
Applications
Peak and average RF power measurements, radar pulse analysis, wireless communication standard testing (LTE, WLAN)
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