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Keysight M9381A, 1 MHz to 6 GHz RF Output, 40 MHz Bandwidth, PXIe Vector Signal Generator

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Keysight Agilent HP - PXI Signal Generators - M9381A
Keysight Agilent HP - PXI Signal Generators - M9381A - Wiring
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Keysight Agilent HP - PXI Signal Generators - M9381A
Keysight Agilent HP - PXI Signal Generators - M9381A - Wiring
M9381A New
M9381A Refurbished

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Keysight M9381A PXIe Vector Signal Generator

The M9381A from Keysight is a PXIe vector signal generator created for industrial automation test systems. This generator provides synthesized RF output from 1 MHz to 6 GHz, integrating digital vector modulator and source output within a compact PXIe architecture. It incorporates dedicated synthesizer and frequency reference modules for phase coherence across multiple channels. The M9381A achieves fast list mode switching suited to high throughput automated manufacturing environments. Its internal time-base stability minimizes frequency error over long operating periods using a precision oven-controlled crystal reference design.

External reference inputs from 1 MHz to 110 MHz allow locking to centralized reliable plant timing standards. Its spectral purity includes single sideband phase noise of -112 dB/Hz at 3 GHz and at 1 GHz phase noise typically reaches -122 dB/Hz at 20 kHz. Broadband noise floor remains below -140 dB/Hz at +10 dB mW output. The PXIe signal generator supports output power to +19 dB mW using high power option. Its programmable power range extends from +20 to -130 dB mW with fine step resolution. The unit’s absolute level accuracy in continuous wave mode remains within 0.5 dB across specified frequency and power combinations. Its automatic power search routines optimize amplitude accuracy for vector modulation modes when automatic level control is temporarily disabled.

The unit’s vector modulation bandwidth starts at 40 MHz and extends to 160 MHz with appropriate bandwidth options. Its RF I and Q channel flatness stays within fractions of a decibel across the configured specified modulation bandwidth. Residual carrier leakage and image suppression performance support demanding digital modulation formats including WCDMA WLAN LTE and GSM.

The M9381A features arbitrary waveform memory from 32 M samples to 1024 M samples depending installed options. Its waveform playback supports complex multi standard signals enabling realistic loading of power amplifiers and transceiver front end designs. The unit’s channel to channel synchronization provides sub nanosecond deterministic timing skew for multiport configurations inside a shared PXIe chassis. Phase alignment of this vector signal generator repeatability enables coherent multichannel generation for MIMO testing and beamforming oriented industrial communication platforms and infrastructure. Its integrated trigger inputs and PXIe backplane timing simplify deterministic coordination with connected analyzers switches and external control equipment.

Model NameM9381A
ManufacturerKeysight
Part TypePXIe vector signal generator
Arbitrary Frequency Change≤ 5 ms (standard), ≤ 185–240 µs (UNZ)
Daily Aging< ±0.5 ppb/day
Initial Calibration Accuracy±5×10⁻⁸
Temperature Effects±10 ppb (20–30 °C), ±50 ppb (full)
Frequency1–110 MHz, sine
ConnectorSMB
Lock Range±1 ppm

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Common Typos:

H9381A, L9381A, MI381A, M9R81A, M93U1A
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