Advantest U3741 9kHz to 3GHz Spectrum Analyzer

The Advantest U3741 is a 9 kHz to 3 GHz spectrum analyzer engineered for signal analysis, component testing, and electromagnetic compatibility (EMC) measurements. It delivers high sensitivity with a displayed average noise level of −135 dBm at 1 GHz (pre-amplifier on) and maintains amplitude accuracy to ±1.0 dB across its full frequency range. The instrument supports multiple detection modes - normal, positive peak, negative peak, sample, RMS, and average - with configurable resolution bandwidth from 100 Hz to 1 MHz and video bandwidth spanning 10 Hz to 3 MHz.

Technical Specifications

• Frequency range: 9 kHz to 3 GHz


• Pre-amplifier active: 10 MHz to 3 GHz


• Frequency span: 5 kHz to full span; 1 kHz to full span with OPT.70


• Frequency span accuracy: <±1%


• Residual FM: <60 Hz peak-to-peak / 100 ms (internal reference)


• Measurement range: displayed average noise level to +30 dBm


• Maximum safe input: +30 dBm (attenuator ≥10 dB, pre-amp off); +13 dBm (pre-amp on)


• DC input maximum: ±50 VDC


• Input attenuator: 0 to 50 dB in 10 dB steps


• Reference level: −140 to +40 dBm Resolution & Sweep


• Resolution bandwidth: 100 Hz to 1 MHz; 30 Hz to 1 MHz with OPT.70/71


• RBW accuracy: <±12%


• Video bandwidth: 10 Hz to 3 MHz


• Sweep time: 20 ms to 1000 s (spectrum mode); 50 µs to 1000 s (zero span)


• Sweep time accuracy: <±2% (zero span)


• Sweep modes: continuous, single, gated Triggering & Calibration


• Trigger sources: free run, video, external, IF


• Calibration signal: 20 MHz at −20 dBm (75 Ω)


• Calibration accuracy: ±0.3 dB


• Amplitude accuracy (post-calibration): ±1.0 dB (9 kHz to 3 GHz); ±0.8 dB (10 MHz to 3 GHz)

Key Features

• Display modes include dBm, dBmV, dBµV, dBµVemf, dBpW, W, and V


• Optional low-frequency span capability down to 1 kHz with OPT.70


• Extended measurement range to 134 dBµV with OPT.15 installed


• User-friendly interface supports rapid measurement setup and analysis

Typical Applications

• Signal characterization across RF and microwave bands


• EMC and interference compliance testing


• Component and subsystem validation


• Spurious and harmonic content measurement

Compatibility & Integration The U3741 accepts multiple input scales and supports external and gated triggering for integration into automated test systems.