# Agilent E4431A Digital RF Signal Generator, 250 kHz to 2000 MHz (Pre-Owned) # Agilent E4431A Digital RF Signal Generator, 250 kHz to 2000 MHz (Pre-Owned) ## Key Features At A Glance - Frequency range 250 kHz to 2000 MHz with 0.01 Hz resolution - Output level +13 to -136 dBm (250 kHz to 1000 MHz) set with 0.02 dB resolution - SSB phase noise <-120 dBc/Hz at 500 MHz (typical, 20 kHz offset) - Analog FM, PM, AM, and pulse modulation with internal multi-waveform source - I/Q modulation inputs (50 ohm, 0.5 Vrms full scale) for vector modulation - Optional baseband generator (Opt UN3/UN4): DECT, GSM, NADC, PDC, PHS, TETRA formats - Optional high-stability timebase (Opt 1E5): <±0.1 ppm/yr aging - 50 W reverse power protection; 50 ohm output impedance The Agilent E4431A is a digital RF signal generator that delivers a calibrated, modulated RF source from 250 kHz to 2000 MHz. A member of the ESG series, it combines a synthesized carrier with a full suite of analog modulation modes and I/Q vector modulation, providing a single-box stimulus source for both general-purpose RF work and digitally modulated communications signals. With the optional I/Q baseband generator (Option UN3 or UN4), the E4431A generates framed, digitally modulated signals for the DECT, GSM (including DCS1800/PCS1900), NADC, PDC, PHS, and TETRA standards. The baseband generator structures data into frames and timeslots that can be configured as traffic or control channels, with each timeslot accepting a user file, a PRBS pattern (PN9 or PN15), or external serial data with the appropriate clock. ValueTronics stocks and holds its own test-and-measurement inventory in a 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every pre-owned unit is inspected and functionally verified in-house before it ships, while new units leave the warehouse factory-sealed exactly as received from the manufacturer. ## Brand Heritage Agilent Technologies was spun off from Hewlett-Packard in 1999. In 2014, Agilent's electronic measurement business was established as a separate company, Keysight Technologies, which now supports this product line. ## Product Core & Specifications Specification Value Frequency Frequency Range 250 kHz to 2000 MHz Resolution 0.01 Hz Switching Speed (Modulation On) <45 ms, typical Switching Speed (Modulation Off) <35 ms, typical Accuracy Same as timebase Sweep Modes Operating Modes Step: frequency & power, and arbitrary list Dwell Time 2 ms to 60 sec Number of Points 2 to 401 Internal Reference Oscillator Aging Rate (Standard, typical) <±2 ppm/yr Aging Rate (High Stability, Opt 1E5) <±0.1 ppm/yr or <±0.0005 ppm/day after 45 days Temperature (Standard) <±1 ppm Temperature (High Stability, Opt 1E5) <±0.05 ppm, typical (0° to 55° C) Line Voltage (Standard) <±0.1 ppm (+5%, -10%) Line Voltage (High Stability, Opt 1E5) <±0.002 ppm, typical (+5%, -10%) Timebase Reference Output Frequency: 10 MHz; Amplitude: >0.35 Vrms into 50 ohm load External Reference Input Frequency: 1, 2, 5, 10 MHz ± typ. 10 ppm (Option 1E5: 1 ppm, typical); Amplitude: >0.15 Vrms; Input Impedance: 50 ohm Output Range (250 kHz to 1000 MHz) +13 to -136 dBm Range (>1000 MHz to 3000 MHz) +10 to -136 dBm Range (>3000 MHz to 4000 MHz) +7 to -136 dBm Resolution 0.02 dB Level Accuracy (at 23 ±5°C, +7 to -127 dBm), 250 kHz to 2 GHz ±0.5 dB Level Accuracy (at 23 ±5°C, +7 to -127 dBm), 2 GHz to 4 GHz ±0.9 dB Level Accuracy (<-127 dBm), 250 kHz to 2 GHz ±1.5 dB Level Accuracy (<-127 dBm), 2 GHz to 4 GHz ±2.5 dB Attenuator Hold Level Range \>17 dB Switching Speed <25 ms typical; With Power Search Mode: <210 ms typical Reverse Power Protection (250 kHz to 2000 MHz) 50 Watts Reverse Power Protection (>2000 MHz to 4000 MHz) 25 Watts Max DC Voltage 50 V SWR (typical), 250 kHz to 2000 MHz <1.4:1 SWR (typical), >2000 to 4000 MHz <1.9:1 Output Impedance 50 ohms Spectral Purity SSB Phase Noise (typical, at 20 kHz offset) at 500 MHz <-120 dBc/Hz SSB Phase Noise at 1000 MHz <-116 dBc/Hz SSB Phase Noise at 2000 MHz <-110 dBc/Hz SSB Phase Noise at 3000 MHz <-104 dBc/Hz SSB Phase Noise at 4000 MHz <-104 dBc/Hz Residual FM (CW mode, 0.3-3 kHz BW, CCITT, rms), Phase Noise Mode 1 Residual FM, Phase Noise Mode 2 Harmonics (<=+4 dBm output level) <-30 dBc Nonharmonics (>3 kHz offset, <+7 dBm output level), 250 kHz to 1000 MHz <-65 dBc Nonharmonics, >1000 MHz to 2000 MHz <-59 dBc Nonharmonics, >2000 MHz <-53 dBc Subharmonics, <=1000 MHz None Subharmonics, >1000 MHz <-40 dBc I/Q Modulation I & Q Inputs Input Impedance 50 ohms Full Scale Input √(I² + Q²) = 0.5 Vrms External Input RF Bandwidth (1 dB) 20 MHz, typical DC Offset (I + Q independently adjustable) ±100% I/Q Gain Ratio ±4 dB DC Vector Accuracy — Static EVM (rms): <0.6 GHz / 0.6 to 2 GHz / 2 to 3.7 GHz / <=4 GHz <0.75% / <0.5% / 0.75% / <1% DC Vector Accuracy — Magnitude Error (rms): <0.6 GHz / 0.6 to 2 GHz / 2 to 3.7 GHz / <=4 GHz <0.5% / <0.35% / <0.5% / <0.75% DC Vector Accuracy — Phase Error (rms): <0.6 GHz / 0.6 to 2 GHz / 2 to 3.7 GHz / <=4 GHz <0.35° / <0.25° / <0.35° / <0.5° DC Vector Accuracy — Origin Offset (dBc): <0.6 GHz / 0.6 to 2 GHz / 2 to 3.7 GHz / <=4 GHz <-46 / <-46 / <-40 / <-40 Frequency Modulation Maximum Deviation N x 10 MHz Resolution 0.1% of deviation or 1 Hz, whichever is greater Deviation Accuracy (1 kHz rate, dev. <±(3.5% of FM deviation + 20 Hz) Modulation Frequency Response FM1 (1 dB BW / 3 dB BW typical) dc/20 Hz to 100 kHz / dc/5 Hz to 10 MHz Modulation Frequency Response FM2 (1 dB BW / 3 dB BW typical) dc/20 Hz to 100 kHz / dc/5 Hz to 1 MHz Distortion (1 kHz rate, THD, dev. = N x 100 kHz) <1% Phase Modulation Maximum Deviation N x 90 radians Resolution 0.1% of set deviation Deviation Accuracy (1 kHz rate) <±(5% of deviation + 0.01 radians) Modulation Frequency Response — Normal BW (N x 90 rad): PM1 / PM2 (3 dB BW) dc to 100 kHz / dc to 100 kHz Modulation Frequency Response — High BW (N x 2π rad): PM1 / PM2 (3 dB BW) dc to 1.5 MHz (typ) / dc to 1 MHz (typ) Modulation Frequency Response — High BW (N x π/2 rad): PM1 / PM2 (3 dB BW) dc to 4 MHz (typ) / dc to 0.9 MHz (typ) Distortion (1 kHz rate, THD, dev <1% Amplitude Modulation (fc > 500 kHz) Range (envelope peak <= max specified power) 0 to 100% Resolution 0.1% Rates (3 dB Bandwidth) dc/10 Hz to 10 kHz Distortion (1 kHz rate, THD) 30% AM <1.5% Distortion (1 kHz rate, THD) 90% AM <4% Accuracy (1 kHz rate) <±(5% of setting + 1%) Wide Band AM Rate (1 dB Bandwidth, typical) ALC On 400 Hz to 10 MHz Rate (1 dB Bandwidth, typical) ALC Off DC to 10 MHz Input I Input Sensitivity 0.5 V = 100% Pulse Modulation On/Off Ratio <=3 GHz \>80 dB On/Off Ratio >3 GHz \>60 dB Rise/Fall Times 150 ns, typical Minimum Width (ALC On / ALC Off) 2 µs, typical / 0.4 µs, typical Pulse Repetition Frequency (ALC On) 10 Hz to 250 kHz, typical Pulse Repetition Frequency (ALC Off) DC to 1.0 MHz, typical Level Accuracy (relative to CW) ±0.5 dB, typical External Input (Ext 2) Input Voltage RF On: >+0.5 V, nominal; RF Off: <+0.5 V, nominal External Input (Ext 2) Input Impedance 50 ohms, nominal Internal Pulse Generator Squarewave Rate: 0.1 Hz to 50 kHz; Pulse Period: 16 µs to 30 sec; Pulse Width: 8 µs to 30 sec; Pulse Resolution: 4 µs Burst Envelope On/Off Ratio (VIN <=-1.05 V) <=3 GHz \>75 dB Impedance 50 ohms > **Important:** Reverse power protection: 50 W from 250 kHz to 2000 MHz; maximum applied DC voltage 50 V. ## About this Pre-Owned unit This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects. - Warranty included with every pre-owned unit. - Functional verification included. - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - 560.0 USD - **Vendor:** Agilent - **Type:** Rf Gen - **Tags:** Agilent, Agilent Keysight, Manufacturers, product_manual_group_1, Product_used, RF, Signal Generators ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 455.00 USD | In stock | | NIST Traceable with Full Data | 490.00 USD | In stock | | ISO IEC 17025 Accredited | 560.00 USD | In stock | ## Images - Agilent E4431A Digital RF Signal Generator, 250 kHz to 2000 MHz (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/e4431a-agilent-rf-generator-used) > Updated: 2026-07-06