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3561A - Hp  parts (786) 681-7852 /


HP 3561A Real time spectrum analyzer

$ 600.00

This product may have a 20% restock fee

The HP 3561A is a versatile, single channel, real time spectrum analyzer with applications in electronics, vibration analysis, and acoustics. It is actually several instruments in one, operating in both the frequency domain and the time domain. In the frequency  domain it serves as a spectrum analyzer with ± 0. 15dB amplitude accuracy and 2 degrees triggered phase accuracy. Utilizing the built-in tracking noise source, it also can serve as a network analyzer. (Trace math can be used when phase response or high accuracy is desired.) Digital signal processing allows the HP 3561A to digitally synthesize 1/3 or 1/1 octave filters, providing a high accuracy, drift free octave analyzer. Operating in the time domain the HP 3561 A can be used as a low frequency digital storage oscilloscope. The HP  3561A contains a 40k sample time buffer and complete triggering flexibility, so waveform recording is easy. Time or frequency measurements can be stored in an optional non-volatile "bubble" memory for later analysis. Annotated hardcopy is easily obtained by pressing "plot". . . the HP 3561A will control HP-GL plotters and raster dump printers directly. All of these capabilities in one portable instrument make the HP 3561A a powerful addition to any bench, and with a standard HP-IB interface, the HP 3561A makes an excellent systems instrument as well.


  • USED and Tested
  • Spectrum and network analysis, waveform recording, 1/3 and 1/1 octave analysis
  • High accuracy, ± 0.15dB
  • 80 dB dynamic range and full alias protection
  • High speed (7.5kHz Real Time Rate)
  • Band selectable zoom analysis for 640 μHz resolution
  • Full CRT annotation and softkey ease-of-use
  • Auto-ranging, auto-calibration, auto-scaling
  • Internal non-volatile memory stores 2 traces and 6 states. Optional bubble (non-volatile) memory stores 127 traces and states.


Frequency Range: 0.000125 Hz to 100 kHz
Real-time Bandwidth: (Typical) single display, 3 kHz; fast average display, 7.5 kHz
Amplitude Measurement Range: +27 to -120dbV noise floor (22.4 VRMS to 1μV noise floor)
Dynamic Range: 80 dB
Input Impedance: 1 Mohm ± 5% shunted by 95 pF maximum.
Isolation: Input low may be connected to chassis ground or floated up to 30 volts rms (42 volts peak) above ground.
Coupling: Signal may be ac or dc coupled. Low frequency 3-dB point <1 Hz in ac mode.
Band-limited, band-translated, psuedo-random, random,
or impulse, or TTL "synch"
Magnitude. phase, time, and math traces can be selected.
Units available are:
  • Horizontal: Hz, seconds, RPM, orders; linear, or log spacing
  • Vertical: dBV, dBm (selectable Z), volts, volts squared, and user-defined units.
Math Arithmetic operations can be performed on new or recalled
frequency spectra. Add, subtract, multiply, divide, integrate,
differentiate, and user-defined constants are provided. 1 B/W is
provided for Power Spectral Density (PSD) computations
Internal Memory Standard Nonvolatile: 2 traces, 6 states
Standard Volatile: 40 time records

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