The SR780 Dynamic Signal Analyzer combines high performance and low cost in a full-featured package. It offers 102.4 kHz dual-channel FFTs with 90 dB dynamic range, 145 dB dynamic range swept-sine measurements, real-time ANSI standard octave analysis, waterfall displays and transient capture for less than half the cost of other similarly equipped analyzers.
Whether your application involves acoustic measurements, vibration testing, servo systems or filter design, the SR780’s features, performance and low cost are unmatched.
Features and Specifications of:
●DC to 102.4 kHz bandwidth
●90 dB dynamic range
●Low-distortion synthesized source
●145 dB dynamic range in swept-sine mode
●Real-time octave analysis
●Up to 32 Mbyte memory
●GPIB and RS-232 interfaces
●Measurement Groups:
oFFT: FFT, Time Record, Windowed Time, Time Capture, Transfer Function, Cross Spectrum, Coherence, Cross-Correlation, Auto-Correlation, Orbit, User Math
oOctave Analysis: 11/1, 1/3, 1/12 Octave, Time Capture, User Math, Leq, Impulse, Total Power
oSwept-Sine: Spectrum, Transfer Function, Cross Spectrum, User Math
●FFT Resolution: 100, 200, 400, 800 lines
●Views: Linear Magnitude, Log Magnitude, Magnitude Squared, Real Part, Imaginary Part, Phase, Unwrapped Phase, Nichols, Nyquist
●Units: V, V2, V2/Hz, V/vHz, meters, inches, mils, g, kg, lbs., N, dynes, pascals, bars, SPL, user-defined engineering units (EUs)
●Displays: Single, Dual, Waterfall with Skew, Zoom and Pan
●Averaging: RMS, Vector, Peak Hold, Linear, Exponential, Equal Confidence (Octave), Preview Time Record
●Triggering: Continuous, Internal, External (Analog or TTL), Source, Auto/Manual Arming
●Source Outputs: Sine, Two-Tone, Swept-Sine, White/Pink Noise, Burst Noise, Chirp, Burst Chirp, and Arbitrary
●Windows: Hanning, Blackman-Harris, Flat-Top, Kaiser, Force/Exponential, User-Defined, +/-T/2, +/-T/4, T/2, Uniform
●User Math: +, -, ×, /, Conjugate, Magnitude/Phase, Real/Imaginary, Sqrt, FFT, Inverse FFT, jO, Log, Exp, d/dx, Group Delay, A-, B-, C-Weighting, x/x-1
●Analysis: Harmonic, Band, Sideband, THD, THD + N, Limit Test with Pass/Fail, Data Table, Exceedance, Statistics
●Time Capture: Captures time data for later analysis (FFT or Octave). Up to 2 Msamples (8 Msamples optional) of data can be saved.
●Storage: 3.5″, 1.44 Mbyte, DOS formatted disk. Save data and setups.
●Frequency:
oRange: 102.4 kHz or 100 kHz (both displays have the same range)
oFFT Spans: 195.3 mHz to 102.4 kHz or 191 mHz to 100 kHz. The two displays can have different spans and start frequencies.
oFFT Resolution: 100, 200, 400 or 800 lines
oReal-Time Bandwidth: 102.4 kHz (highest FFT span with continuous data acquisition and averaging)
oAccuracy: 25 ppm from 20 °C to 40 °C
●Dynamic Range:
oRange: 90 dB typical, 80 dB guaranteed (FFT and Octave). 145 dB (Swept-Sine). Includes spurs, harmonic and intermodulation distortion and alias products. Excludes alias responses at extremes of span.
oHarmonic Distortion:
oIntermod Distortion:
oSpurious:
oAlias Responses:
oFull-Span FFT Noise Floor: -100 dBfs typ. (input grounded, >-30 dBV, Hanning window, 64 rms averages)
oResidual DC Response:
●Amplitude Accuracy:
oSingle Channel: ±0.2 dB (excluding windowing)
oCross Channel: ±0.05 dB (transfer function measurement, both inputs on the same range, rms averaged, DC to 102.4 kHz)
●Phase Accuracy:
oSingle Channel: ±3.0 deg. relative to external TTL trigger (-50 dBfs to 0 dBfs, frequency
oCross Channel:
■±0.5 deg. (DC to 51.2 kHz)
■±1.0 deg. (DC to 102.4 kHz)
■(transfer function measurement, both inputs on the same input range, vector averaged)
●Signal Inputs:
oNumber of Inputs: 2
oFull-Scale Input Range: -50 dBV (3.16 mVp) to +34 dBV (50 Vp) in 2 dB steps
oMaximum Input Level: 57 Vp
oInput Configuration: Single-ended (A) or differential (A-B)
oInput Impedance: 1 MO + 50 pF
oShield to Chassis:
■Floating mode: 1 MO + 0.01 µF.
■Grounded mode: 50 O. Shields grounded in (A-B) mode
oMax Shield Voltage: 4 Vp
oAC Coupling: 0.16 Hz cutoff frequency
oCMRR:
■90 dB at 1 kHz (input range
■80 dB at 1 kHz (input range
■50 dB at 1 kHz (input range =10 dBV)
oICP Signal conditioning:
■Current Source: 4.8 mA
■Open Circuit Voltage: +26 V
oA-Weight Filter: Type 0 tolerance, ANSI standard S1.4-1983 (10 Hz to 25.6 kHz)
oCrosstalk:
oInput Noise:
●Trigger Input:
oModes: Free run, Internal, External, or External TTL
oInternal: Level adjustable to ±100 % of input scale, positive or negative slope.
■Min Trigger Level: 5 % of input range
oExternal: -Level adjustable to ±5 V in 40 mV steps, positive or negative slope.
■Input Impedance: 1 MO
■Max Input: ±5 V
■Min Trigger Amplitude: 100 mV
oExternal TTL: Requires TTL level to trigger (low 3.0 V)
oPost-Trigger: Measurement record is delayed up to 8192 samples after the trigger.
oPre-Trigger: Measurement record starts up to 8192 samples prior to the trigger.
●Transient Capture:
oMode: Continuous data recording
oMaximum Rate: 262,144 samples/s for both inputs
oMaximum Capture Length:
■2 Msamples (single input)
■8 Msamples with optional memory
●Octave Analysis:
oStandards: Conforms to ANSI standard S1.11- 1986, Order 3, Type 1-D and IEC 225-1966
oFrequency Range (Band Centers):
■ Single Channel:
■1/1 Octave : 0.125 Hz to 32 kHz
■1/3 Octave : 0.100 Hz to 40 kHz
■1/12 Octave : 0.091 Hz to 12.3 kHz
■ Two Channels:
■1/1 Octave : 0.125 Hz to 16 kHz
■1/3 Octave : 0.100 Hz to 20 kHz
■1/12 Octave : 0.091 Hz to 6.17 kHz
oAccuracy:
oDynamic Range: 80 dB (1/3 Octave, 2 second stable average) per ANSI S1.11-1986
oSound Level: Impulse, Peak, Fast, Slow and Leq per ANSI S1.4-1983 Type 0 and IEC 651-1979 Type 0
●Source Output:
oAmplitude Range: 0.1 mVp to 5 Vp
oAmplitude Resolution: 0.1 mVp (output >500 mVp)
oDC Offset:
oOffset Adjust: ±5 VDC (sine, two-tone)
oOutput Impedance:
●Sine Source:
oAmplitude Accuracy:
■±1 % of setting, 0 Hz to 102.4 kHz
■0.1 Vp to 5.0 Vp, High-Z load
oHarmonics, Sub-harm & Spurious:
■0.1 Vp to 5 Vp
●Two-Tone Source:
oAmplitude Accuracy:
■±1 % of setting, 0 Hz to 102.4 kHz
■0.1 Vp to 5 Vp, High-Z load
oHarmonics, Sub-harm:
■0.1 Vp to 2.5 Vp
●White Noise Source:
oTime Record: Continuous or burst
oBandwidth: DC to 102.4 kHz or limited to span
oFlatness:
o5000 rms averages
●Pink Noise Source:
oBandwidth: DC to 102.4 kHz
oFlatness:
●Chirp Source:
oTime Record: Continuous or Burst
oOutput: Sine sweep across the FFT span
oFlatness: ±0.25 dB (amplitude: 1.0 Vp)
●Swept-Sine Source:
oAuto Functions: Source level, input range and frequency resolution
oDynamic Range: 145 dB
●Arbitrary Source:
oAmplitude Range: ±5 V
oRecord Length: 2 Msamples (playback from arbitrary waveform memory or capture buffer). Variable output sample rate.
●General:
oCTR Monitor: Monochrome, 800H by 600V resolution
oInterfaces: IEEE-488.2, RS-232 and printer interfaces standard. All instrument functions can be controlled through computer interfaces. A PC (XT) keyboard input is provided for additional flexibility.
oHardcopy: Print to dot matrix and PCL compatible printers. Plot to HP-GL or postscript plotters. Print/plot to RS-232 or IEEE-488.2 interfaces or to disk file. Additional file formats include GIF, PCX and EPS.
oDisk: 3.5″ DOS format, 1.44 Mbytes
oPreamp Power: Power connector for SRS preamps
oPower: 70 W, 100/120/220/240 VAC, 50/60 Hz
