The HP 3561A is a classic single-channel Fast Fourier Transform (FFT) dynamic signal analyzer featuring a frequency range up to 100 kHz. Known for its high accuracy in acoustic, audio, and vibration analysis, it delivers an 80 dB dynamic range alongside comprehensive 1/3 octave and full octave formatting capabilities. Built-in mathematical operations, an internal source generator, and HP-IB programmability make it a highly capable instrument for benchtop and system applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | HP-IB (IEEE-488) |
| Display | Built-in CRT |
| Built-in Self-Test | Power-on and user-initiated self-tests |
| Calibration Reference | Internal calibration signal |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 110 / 120 / 220 / 240 VAC (+5%, -10%), 48 to 66 Hz, 150 VA max |
| Operating Temperature | 0 °C to 55 °C |
| Dimensions (W×H×D) | 425 mm × 222 mm × 533 mm |
| Weight | 15 kg |
Frequency Characteristics
| Parameter | Value |
|---|---|
| Frequency Range | Up to 100 kHz |
| Real-time Bandwidth | 13 kHz |
| Frequency Resolution (Narrow Band) | 400 lines |
| Resolution at Maximum Span | 250 Hz (for 100 kHz display span) |
| Resolution at Minimum Span | 25.6 microHz (for 0.01024 Hz display span) |
| Display Span Range | 0.01024 Hz to 100 kHz |
Amplitude & Input Characteristics
| Parameter | Value |
|---|---|
| Number of Channels | 1 channel |
| Maximum Safe Input Voltage | 42 V peak |
| Minimum Full Scale Input Range | -51 dBV (2.82 mVrms) |
| Dynamic Range | 80 dB |
| ICP Transducer Power | Integrated Circuit Piezoelectric current source available |
| Acoustic Filter | A-weighting filter available |
Measurement & Analysis Functions
| Parameter | Value |
|---|---|
| Measurement Formats | Narrowband, 1/3 octave, full octave |
| Averaging Modes | RMS, RMS exponential weighting, time averaging |
| Peak Hold Mode | Captures maximum amplitude |
| Overload Reject Mode | Excludes overloaded measurements from averaging |
| Mathematical Operations | Addition, subtraction, multiplication, division, integration, differentiation |
| Time Buffer Capture | Captures narrowband data for post-processing |
Display & User Interface
| Parameter | Value |
|---|---|
| Display Presentation Formats | Single trace, top-bottom dual trace, front-back dual trace, map-type format |
| Waterfall Map Capacity | Up to 60 traces |
| Amplitude Scaling | Linear or logarithmic |
Connectivity, Interfaces & Storage
| Parameter | Value |
|---|---|
| Internal Storage (Standard) | Nonvolatile memory for 6 setups and 2 traces |
| Optional Storage | Bubble memory (setups, traces, and time capture storage) |
| HP-IB Plotter and Printer Support | Direct output plotting and printing via HP-IB |
| Remote Programmability | Fully remote programmable via HP-IB |
Signal Source (Generator) Characteristics
| Parameter | Value |
|---|---|
| Source Waveforms | Periodic chirp, random noise, impulse |
Input Characteristics
| Parameter | Value |
|---|---|
| Input Impedance | 1 MΩ shunted by < 100 pF |
| Input Coupling | AC, DC |
| Common Mode Rejection | > 80 dB at 50/60 Hz |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +75 °C |
| Relative Humidity | < 95% at 40 °C (non-condensing) |
Frequency
| Parameter | Value |
|---|---|
| Number of Lines | 400 lines |
| Frequency Accuracy | ±0.003% of reading |
Amplitude
| Parameter | Value |
|---|---|
| Spurious Responses | <-80 dB relative to full scale |
| Anti-alias Filter Attenuation | >80 dB |
Signal Source
| Parameter | Value |
|---|---|
| Source Output Impedance | 50 Ω (nominal) |
| Source Output Level | +10 dBV to -50 dBV (1 V to 3.16 mV rms) |
Signal Processing
| Parameter | Value |
|---|---|
| Window Functions | Flat Top, Hann (Hanning), Uniform |
Technology
FFT Dynamic Signal Analysis
Applications
Acoustic, audio, and vibration analysis