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OscilloMeter - Spectrum
Analyzer for real-time v.7.01 |
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- Works by algorithm of Fast Fourier
transform (FFT).
- Size of the FFT block is up to 224
samples of an input signal.
- Processing the overlapped time
series of samples of input signals for
combination of the analysis high resolution both
in time and on frequency simultaneously.
- Spectrum analysis uses different
smoothing windows (more than 90 types) for
weighting of input signals in time domain.
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Special modes of
dual-channel FFT spectral analysis:
- Separate channels spectra.
- Spectra of digital sum and
difference of signals of two channels.
- Spectrum of digital product of
signals of two channels.
- Spectrum of digital difference of
original signal and its fundamental.
- Spectrum of digital product of
original signal and its fundamental. Use for
jitter analysis and measurement.
- Real Transfer Function as Ratio of
power of corresponding spectral components versus
frequency.
- Complex Transfer Function as
Vector ratio of corresponding spectral components
versus frequency.
- Cross Spectrum as product of left
channel spectrum and complex conjugate right
channel spectrum.
- Coherence Function.
- All above items can be represented
by special 3-d spectra versus time view
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Program Measures
Signal Parameters
| Mode |
Range |
Inaccuracy
of calculation |
| FFT Spectral Analysis |
190 dB
0...FS / 2 |
0.01 dB
2-24 FS Hz |
| OscilloScope |
0...Full
Scale |
1 LSB |
| Frequency counter |
0...FS
/ 2 |
5·10-8
…5·10-7 of value |
| AC Peak voltmeter |
190 dB |
0.01 dB |
| AC RMS voltmeter |
190 dB |
0.01 dB |
| DC voltmeter |
ADC Full
Scale |
1 LSB |
| Total Power |
190 dB |
0.01 dB |
| Signal-to-Noise Ratio (SNR) |
190 dB |
0.05 dB |
| Signal-to-Noise and
Distortion (SINAD) |
190 dB |
0.05 dB |
| Spurious-Free Dynamic Range
(SFDR) |
190 dB |
0.05 dB |
| Effective Number Of Bits (ENOB) |
0...Full
Scale |
0.1 bit |
| Total Harmonic Distortion (THD) |
190 dB |
0.1 dB |
| Inter-Modulation Distortion
(IMD) |
190 dB |
0.1 dB |
| Phase Shift |
±180° |
0.0001° |
| Group Delay |
±1/2(f1-f2)
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0.1 %
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| Amplitude Distribution |
0...100% |
1 LSB |
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Additional Program
Features
- The obtained data and results of Spectral
Analysis can be saved to files or clipboard.
- Oscilloscope modes (for
dual-channel ADC) are: original signals, sum,
difference, dependence of one channel on another,
dependence of channels sum on channels difference
(stereo-meter), amplitude distribution of input
signals.
- Spectrum analyzer provides
averaging of results of some sequential FFT:
equally weighted - scalar or vector;
exponentially weighted - scalar. Number of
averaging transforms is from 2 up to 20 or
infinite.
- Spectrum analyzer provides
measurement of power in fractionary-octave bands:
from entire octave to its 1/96 part.
- The parameters of noise and
distortion in audio range can be calculated
according to the subjective perception. The
weighing is made under the recommendations of
International electrotechnical commission (IEC-A,B,C,D),
International Radio Consultative Committee (Consultative
Committee on International Radiocommunications -
CCIR-468-2/DIN45405) or ANSI/IEEE743-1384.
- Synchronization of Spectrum
analyzer is independent from the oscilloscope.
- Spectrum analyzer can
display holding or decaying maximum values of
real-time spectra.
- Indication of ADC input overload (clipping).
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- The OscilloMeter - Spectrum
analyzer demo works with ADC of a sound card and
is a fully functional copy of the program with
one exception that input time is limited to 15
seconds after each "Start" button click.
- The registration removes
demonstration limitation of the OscilloMeter -
Spectrum analyzer. See Help (F1)->Registration
for details.
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