The Anritsu MS2651B is a synthesized spectrum analyzer operating from 9 kHz to 3 GHz, delivering signal visualization, spectrum monitoring, and RF component evaluation for maintenance and field applications. This portable instrument combines superior basic performance with ease of operation and an extensive built-in measurement suite.
Technical Specifications
Frequency Performance
• Frequency range: 9 kHz to 3 GHz
• Frequency span accuracy: ±2.5% (spans ≥10 kHz)
• Display frequency accuracy: ± (display frequency × reference frequency accuracy + span × span accuracy + 100 Hz)
• Residual FM: ≤20 Hzp-p/0.1 s (at 1 GHz, 0 Hz span)
Amplitude & Dynamic Range
• Amplitude range: Display Average Noise Level (DANL) to +30 dBm
• DANL: ≤–115 dBm (1 MHz to 1 GHz)
• Maximum input level: +30 dBm (CW average power, RF ATT: ≥10 dB), ±50 Vdc
• Level accuracy: ±1.3 dB (with auto-calibration)
• Dynamic range: >80 dB single-screen display
Distortion & Linearity
• 2nd harmonic distortion: >70 dB (200–500 MHz)
• 3rd intermodulation distortion: >76.6 dB (100–1000 MHz), >83.3 dB (10–1000 MHz)
• C/N ratio: High C/N characteristics
• Noise sideband: Excellent characteristics
Resolution & Filtering
• Resolution bandwidth (3 dB): 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz, 5 MHz (manual or auto)
• Video bandwidth: 1 Hz to 3 MHz (1-3 sequence), OFF (manual or auto)
– Key Features
• Frequency counter with 1 Hz, 10 Hz, 100 Hz, 1 kHz resolution; accuracy: Display frequency × reference frequency accuracy ±1 LSD (S/N ≥20 dB)
• FM demodulation with waveform display: 5% accuracy (±10 kHz to ±1 MHz range)
• Dual-screen display for simultaneous multi-parameter viewing
• Measurement functions: C/N, channel power, adjacent channel power, occupied frequency bandwidth, burst average power, template pass/fail
• Zone marker and zone sweep for targeted frequency analysis
• User-defined functions for customized measurement workflows
• Built-in RS-232C and GPIB (IEEE 488.2) interfaces
• Memory card interface for trace data, parameters, and screen image storage (bitmap format)
– Typical Applications
• RF component characterization and validation
• Adjacent channel power and occupied bandwidth measurements
• Burst signal analysis and modulation assessment
• Field maintenance and troubleshooting
• Radio equipment evaluation
– Compatibility & Integration
RS-232C and GPIB (IEEE 488.2) connectivity enable remote instrument control and automated measurement routines. Memory card support facilitates data logging and documentation across multiple test sessions.
