# Agilent 35670A Dynamic Signal Analyzer, 122 µHz to 102.4 kHz, 2- or 4-Channel FFT-Based Spectrum/Network Analyzer (Pre-Owned) # Agilent 35670A Dynamic Signal Analyzer, 122 µHz to 102.4 kHz, 2- or 4-Channel FFT-Based Spectrum/Network Analyzer (Pre-Owned) ## Key Features At A Glance - FFT-based spectrum and network analyzer covering 122 µHz to 102.4 kHz with 16-bit ADC - Configurable as two- or four-channel: 102.4 kHz single-channel, 51.2 kHz two-channel, 25.6 kHz four-channel (Option AY6) - Typical 90 dB dynamic range with ±0.15 dB FFT full-scale accuracy at 1 kHz - Cross-channel match of ±0.04 dB and ±0.5 degrees for frequency response measurements - Selectable resolution of 100, 200, 400, 800, and 1600 lines with greater than 6 Msample time capture - Source types include random, burst random, periodic chirp, burst chirp, pink noise, and fixed sine; optional swept-sine (1D2) and arbitrary (1D4) - Built-in 3.5-inch 1.44 MB flexible disk plus 2 MB NVRAM disk; supports MS-DOS and HP-LIF formats - GPIB conforming to IEEE 488.1/488.2 and SCPI 1992 for automated measurement systems The Agilent 35670A is a dynamic signal analyzer that performs FFT-based spectrum and network analysis from 122 µHz to 102.4 kHz using a 16-bit ADC architecture. It is configurable as a two-channel instrument with single-channel and dual-channel measurement modes, and Option AY6 extends the instrument to four input channels. The analyzer combines spectrum measurement, network measurement, time capture, histogram analysis, and correlation analysis in a single chassis. A dynamic signal analyzer captures voltage signals over time and uses fast Fourier transform processing to translate them into the frequency domain, allowing an engineer to measure spectral content, frequency response, coherence, and cross-channel relationships between two or more signals. The 35670A's measurement set includes frequency response, linear spectrum, cross spectrum, power spectrum, coherence, power spectral density, time waveform, autocorrelation, cross-correlation, orbit diagrams, and histogram/PDF/CDF analysis. Trace coordinates available on the instrument include linear and log magnitude, dB magnitude, group delay, phase, unwrapped phase, real and imaginary parts, Nyquist, and polar formats. ValueTronics International, LLC has been a specialist source for test and measurement equipment since 1992. Our 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois serves as the central facility where instruments are received, inspected, performance-tested against manufacturer published specifications, and graded by our technicians before they ship. This in-house verification process is the operational difference between a unit accompanied by a documented condition report and an unverified marketplace listing, and it is the basis on which our warranty and post-sale support are extended. ## Brand Heritage Hewlett-Packard's test and measurement division was spun off as Agilent Technologies in 1999. In 2014, Agilent's electronic measurement business was transferred to Keysight Technologies, which is the current corporate successor for instruments originally branded HP and subsequently Agilent. ## Product Core & Specifications Category Parameter Specification Frequency Maximum range, 1 channel mode 102.4 kHz (51.2 kHz with Option AY6) Frequency Maximum range, 2 channel mode 51.2 kHz Frequency Maximum range, 4 channel mode (Option AY6 only) 25.6 kHz Frequency Spans, 1 channel mode 195.3 mHz to 102.4 kHz Frequency Spans, 2 channel mode 97.7 mHz to 51.2 kHz Frequency Spans, 4 channel mode (Option AY6 only) 97.7 mHz to 25.6 kHz Frequency Minimum resolution, 1 channel mode 122 µHz (1600 line display) Frequency Minimum resolution, 2 channel mode 61 µHz (1600 line display) Frequency Minimum resolution, 4 channel mode (Option AY6 only) 122 µHz (800 line display) Frequency Maximum real-time bandwidth, 1 channel mode 25.6 kHz Frequency Maximum real-time bandwidth, 2 channel mode 12.8 kHz Frequency Maximum real-time bandwidth, 4 channel mode (Option AY6 only) 6.4 kHz Frequency Measurement rate, 1 channel mode (typical) ≥ 70 averages/sec Frequency Measurement rate, 2 channel mode (typical) ≥ 33 averages/sec Frequency Measurement rate, 4 channel mode (typical) ≥ 15 averages/sec Frequency Display update rate (typical) ≥ 5 updates/sec Frequency Display update rate (maximum) ≥ 9 updates/sec Accuracy Frequency accuracy ±30 ppm (.003%) Single Channel Amplitude Absolute amplitude accuracy (FFT) ±2.92% (0.25 dB) of reading; ±0.025% of full scale Single Channel Amplitude FFT full scale accuracy at 1 kHz (0 dBfs) ±0.15 dB (1.74%) Single Channel Amplitude FFT full scale flatness (0 dBfs) relative to 1 kHz ±0.2 dB (2.33%) Single Channel Amplitude FFT amplitude linearity at 1 kHz, +27 dBVrms range, 0 to -80 dBfs ±0.58% (0.05 dB) of reading; ±0.025% of full scale Single Channel Amplitude Amplitude resolution (16 bits less 2 dB over-range, typical) 0.0019% of full scale Single Channel Amplitude Residual DC response (FFT mode, excludes A-weight filter) <-30 dBfs or 0.5 mVdc FFT Dynamic Range Spurious free dynamic range (typical, 800 line display, 50 Ω source) 90 dB typical (<-80 dBfs) FFT Dynamic Range Harmonic distortion (single tone in-band, ≤ 0 dBfs) <-80 dBfs FFT Dynamic Range Intermodulation distortion (two tones in-band, each ≤ -6.02 dBfs) <-80 dBfs FFT Dynamic Range Spurious and residual responses (50 Ω source) <-80 dBfs FFT Dynamic Range Frequency alias responses (2.5% to 97.5% of span) <-80 dBfs FFT Dynamic Range Frequency alias responses (lower/upper 2.5% of span) <-65 dBfs Input Noise Input noise level above 1280 Hz (flat top window, -51 dBVrms range, 50 Ω source) <-140 dBVrms/√Hz Input Noise Input noise level, 160 Hz to 1280 Hz <-130 dBVrms/√Hz Single Channel Phase Phase accuracy relative to external trigger ± 4.0 deg Cross-Channel Amplitude FFT cross-channel gain accuracy (frequency response mode, same amplitude range) ± 0.04 dB (0.46%) Cross-Channel Phase Cross-channel phase accuracy ± 0.5 deg Input Input ranges (full scale, auto-range capability) +27 dBVrms (31.7 Vpk) to -51 dBVrms (3.99 mVpk) in 2 dB steps Input Maximum input levels 42 Vpk Input Input impedance 1 MΩ ±10%, 90 µF nominal Input Low side to chassis impedance (floating mode) 1 MΩ ±30% (typical); <0.010 µF Input Low side to chassis impedance (grounded mode) ≤100 Ω Input AC coupling rolloff (50 Ω source) <3 dB rolloff at 1 Hz Input Common mode rejection ratio, -51 to -11 dBVrms ranges \>75 dB typical Input Common mode rejection ratio, -9 to +9 dBVrms ranges \>60 dB typical Input Common mode rejection ratio, +11 to +27 dBVrms ranges \>50 dB typical Input Common mode range (floating mode) ± 4 V pk Input IEPE transducer power supply current source 4.25 ± 1.5 mA Input IEPE transducer power supply open circuit voltage +26 to +32 Vdc Input A-weight filter Type 0 tolerance; conforms to ANSI S1.4-1983 and IEC 651-1979; 10 Hz to 25.6 kHz Input Crosstalk (between input channels, source-to-input) < -135 dB below signal or < -80 dBfs of receiving channel, whichever is greater Time Domain DC amplitude accuracy ±5.0 %fs Time Domain Rise time of -1 V to 0 V test pulse <11.4 µSec Time Domain Settling time of -1 V to 0 V test pulse <16 µSec to 1% Time Domain Peak overshoot of -1 V to 0 V test pulse <3% Time Domain Sampling period, 1 channel mode 3.815 µSec to 2 Sec in 2x steps Time Domain Sampling period, 2 channel mode 7.629 µSec to 4 Sec in 2x steps Time Domain Sampling period, 4 channel mode (Option AY6 only) 15.26 µSec to 8 Sec in 2x steps Trigger Trigger modes Internal, source, external (analog setting), GPIB Trigger Maximum trigger delay (post trigger) 8191 seconds Trigger Maximum trigger delay (pre trigger) 8191 sample periods Trigger External trigger max. input ±42 Vpk Trigger External trigger range (low / high) \-2 V to +2 V / -10 V to +10 V Trigger External trigger resolution (low / high) 15.7 mV / 78 mV **Important:** Maximum input level: 42 Vpk. Input impedance is 1 MΩ ±10% with approximately 90 µF nominal. Common-mode range in floating mode is ±4 V peak.**Important:** Instrument specifications apply after 15 minutes warm-up and within 2 hours of the last self-calibration. When the internal cooling fan has been turned OFF, specifications apply within 5 minutes of the last self-calibration. All specifications are with 400 line frequency resolution and with anti-alias filters enabled unless stated otherwise.**Important:** Option AY6 single channel maximum range extends to 102.4 kHz without anti-alias filter protection.**Important:** Show all lines mode allows display of up to 131.1, 65.5 and 32.7 kHz respectively. Amplitude accuracy is unspecified and not alias protected.**Important:** Some source types are not available for use in optional modes. See option description for details. ## About this used unit - Warranty included - 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). **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 - **Vendor:** Agilent - **Type:** Spec An - **Tags:** Agilent, Agilent Keysight, Analyzers, Manufacturers, product_manual_group_1, Product_used, Signal ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 0.00 USD | In stock | | NIST Traceable with Full Data | 0.00 USD | In stock | | ISO IEC 17025 Accredited | 0.00 USD | In stock | ## Images - 35670A HP Signal Analyzer --- > Source: [ValueTronics](https://valuetronics.com/products/35670a-agilent-signal-analyzer-used) > Updated: 2026-05-30