Features: The 3561A is a low frequency, high performance dual channel dynamic signal analyzer. Displays include a three-dimensional spectral map and time waveforms. The 3561A incorporates a 40 k sample time buffer for later measurements and allows for acoustic measurements with its FFT-synthesized 1/3 and 1/2 octave measurements, together with the built-in analog A-weighted filter. The analyzer also has a built-in tracking generator for stimulus-response measurements . With built-in waveform math, magnitude and phase measurements are possible. Digital processing is used to provide ultra-narrow resolution bandwidths up to 640uHz. Digital processing also speeds up measurements; a measurement with 1 Hz resolution requires only a 1.5 second sweep. In addition to spectrum measurements, the 3561A displays time waveforms similar to oscilloscope displays. A 40k sample time buffer captures transients for examination in the time domain or analysis in the frequency domain. The HP 3561A is also an excellent analyzer for acoustic testing. -------------------------------------------------------------------------------- Specifications: 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 V rms to 1µV noise floor) Dynamic Range: 80 dB Input: Impedance: 1 M ohm 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-d\b point <1 Hz in ac mode. Output: Source: Pseudo-random, random, or impulse. Display: 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 UNIT INCLUDES OPTION 001, STORAGE POUCH, AND MANUAL ON CD. REMOVED FROM SERVICE, EXCELLENT CONDITION. GUARANTEED FOR 30 DAYS.