Agilent 4395A Network Spectrum Impedance Analyzer

The Agilent 4395A Network Spectrum Impedance Analyzer combines vector network analysis, spectrum analysis, and impedance measurement in a single instrument. Operating from 10 Hz to 500 MHz, it delivers 1 mHz frequency resolution and a synthesized source spanning –50 dBm to +15 dBm. The analyzer supports dual-channel color TFT display output and connects via GPIB for automated test integration.

Technical Specifications

Frequency & Source Performance

• Frequency range: 10 Hz to 500 MHz


• Frequency resolution: 1 mHz


• Synthesized source: –50 dBm to +15 dBm, 0.1 dB resolution Network Analysis


• Impedance measurement range: 100 kHz to 500 MHz


• Dynamic magnitude accuracy: ±0.05 dB (typical, –10 dB > input ≥ –60 dB)


• Dynamic phase accuracy: ±0.3° (typical, –10 dB > input ≥ –60 dB)


• Absolute amplitude accuracy: ±1.5 dB at –10 dBm input, 10 dB attenuator, f ≥ 100 Hz


• Trace noise: < 0.005 dB rms at 50 MHz, full-scale input –10 dB, IFBW 300 Hz


• Measurement parameters: |Z|, θz, |Y|, θy, R, X, G, B, Cp, Cs, Lp, Ls, Rp, Rs, D, Q, |Γ|, θΓ, Γx, Γy Spectrum Analysis


• Resolution bandwidth: 2 Hz to 5 MHz with selectable steps


• Displayed average noise level: < –120 dBm/Hz (100 kHz ≤ f < 10 MHz); < –133 dBm/Hz (f ≥ 10 MHz)


• Selectivity (60 dB/3 dB): 0


• Spurious response: –110 dBc/Hz at 1 MHz


• FFT DSP acceleration: up to 100× faster narrow-RBW sweeps Impedance Measurement


• Frequency range: 100 kHz to 500 MHz


• Basic accuracy: 3%


• Optional DC source (Option 001): ±40 V, ±20 to ±100 mA Physical & Environmental


• Dimensions: 425 mm W × 235 mm H × 553 mm D


• Weight: 21 kg (typical)


• Operating temperature: 0 °C to 40 °C


• Storage temperature: –20 °C to 60 °C


• Interface: GPIB


• Storage: 1.44 MB floppy disk (LIF or MS-DOS)

Key Features

• Tri-function analysis in one box eliminates multiple instruments


• Color TFT dual-display for parallel measurement monitoring


• 1 mHz resolution for precision frequency characterization


• < 0.005 dB rms trace noise for low-level signal detection


• Programmable via IBASIC and GPIB automation

Typical Applications

• RF component characterization and impedance matching


• Circuit board assembly (CBA) production testing


• Filter and amplifier S-parameter measurement


• Impedance and Q-factor verification across broadband designs


• Spectrum monitoring and EMI/RFI assessment

Compatibility & Integration GPIB connectivity enables integration into automated test systems. Data storage on 1.44 MB floppy supports LIF and MS-DOS formats for test setup archival and program execution via IBASIC.