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The Sound and Vibration VIs can return the following error codes. Refer to the KnowledgeBase for more information about correcting errors in LabVIEW.

Code	Description
−21419	Channels in a pair must have the same rotation direction.
−21418	More than two channels have the same pair number in channel properties.
−21417	The input signal must have at least two channels.
−21416	The input XY signal cannot be at equal time or speed interval.
−21415	Select at least one channel in the DAQ Config input when you use a digital tachometer channel.
−21414	Select at least two channels in the DAQ Config input when you use an analog tachometer channel.
−21413	The center frequency is invalid. The center frequency cannot be greater than the Nyquist frequency (half of the sampling frequency).
−21412	Multi-channel measurements require that each waveform has the same sample rate.
−21411	The FIR filter settings are incorrect.
−21410	Multi-channel measurements require that each even-angle signal has the same sample rate.
−21409	number of averages for spectrum averaging must be greater than zero.
−21408	The spectrum block size must be greater than zero.
−21407	The number of tachometer pulses is insufficient for further computation.
−21406	The sampling rate must be greater than zero.
−21405	The filter length must be greater than zero.
−21404	The interpolation or decimation factor must be greater than zero.
−21403	The window information parameters are invalid for further computation.
−21402	The refnum does not support this operation.
−21401	The refnum is invalid.
−21400	An unexpected error occurred.
−4968	Setting Function type value to Unsupported functions will not generate any outputs.
−4967	The UFF file contains no functions with the type specified by the input get function type.
−4965	The real part and the imaginary part of the ordinate are unequal in size.
−4964	The real part of the ordinate is empty.
−4961	The input data is empty.
−4958	The data being read is not evenly spaced.
−4957	The data being read is not complex.
−4956	The data being read must be real valued and evenly spaced.
−4955	This VI only supports writing frequency real data. If you are writing frequency response functions, FFT spectra, or cross spectra, then use the complex instance of this VI, which supports writing real and imaginary data.
−4954	This VI only supports writing real and imaginary data. If you are writing frequency response functions, FFT spectra, or cross spectra, then use the VIs that output real and imaginary components of these results.
−4953	This VI only supports reading complex data that is in frequency domain. Select a different instance of the UFF Read VI to read this data.
−4952	This VI only supports reading real data that is in frequency domain. Select a different instance of the UFF Read VI to read this data.
−4951	This VI only supports reading UFF data whose function type is Time Response. Select a different instance of the UFF Read VI to read this data.
−1999	width and height should both be greater than or equal to 0.
−1998	This measurement does not support the specified window. Select a different window.
−1997	plot type specified in colormap attributes inconsistent with x-axis units specified in spectrum info.
−1996	% not within the range from 0 to 100.
−1995	upper limit and/or lower limit incompatible with signal in.
−1994	This function only operates on phase spectra with x-axis units of frequency expressed in Hertz.
−1993	The engineering units specified must be g.
−1992	The engineering units specified must be Pa.
−1991	The engineering units specified are not recognized as acceleration units. Specify units of acceleration by setting the engineering units selection to g, m/s^2, or in/s^2 when scaling the data using the SVL Scale to EU VI.
−1990	The number of pulses detected in tach signal is less than avg on n pulses.
−1989	FFT Block Size should be greater than or equal to 2.
−1988	pulse/revolution should be greater than or equal to 1.
−1987	avg on n pulses should be greater than or equal to 2.
−1986	pulse width should be greater than or equal to 1.
−1985	from [rpm] and to [rpm] should both be greater than or equal to 0.
−1984	There was an error in a Sound and Vibration VI. Please check the input parameters to the VI.
−1983	This function does not support the selected averaging mode.
−1982	dB reference should be greater than 0
−1981	This function does not operate on the given spectrum type. This function operates on FFT Spectrum [complex], Amplitude [Magnitude], and Power [Magnitude^2] spectrum types.
−1980	This function does not operate on the given spectrum type. This function operates on Amplitude [Magnitude] and Power [Magnitude^2] spectrum types.
−1979	exp window [%] should be greater than 0.
−1978	force window [%] should be between 0 and 100.
−1977	Both waveforms should have the same number of samples.
−1976	Both waveforms should have the same sampling frequency (dt of X = dt of Y).
−1975	The number of samples in the input waveform is too large for the selected zoom settings. Reduce the number of samples processed per iteration, decrease the span specified by the frequency range, and/or increase the number of lines computed in the zoom spectrum.
−1974	overlap (%) should be between 0 and 100.
−1973	number of lines should be greater than or equal to 1.
−1972	range is invalid (span=0). Adjust start and stop to include a nonzero span within the spectrum.
−1971	number of averages should be greater than or equal to 1.
−1970	start frequency should be greater than or equal to f0, and stop frequency should be less than or equal to the greatest frequency in the input spectrum
−1969	The specified frequency is not found within the spectrum. This function requires f0 ≤ frequency ≤ fmax where fmax is the maximum frequency of the spectrum.
−1968	All harmonics to visualize should be less than the specified maximum harmonic.
−1967	precision should be greater than or equal to 0.
−1966	This function does not operate on windowed input signals. Input unwindowed signals to this function.
−1965	Specified format value is not supported.
−1962	equal confidence level should be greater than 0.
−1961	frequency range is invalid. Adjust low frequency and high frequency to include a nonzero frequency range.
−1957	high frequency should be less than Nyquist frequency.
−1956	low frequency should be greater than 0.
−1955	frequencies / octave should be greater than 0.
−1954	critical damping factor should be greater than zero
−1953	time constant should be greater than 0.
−1952	integration time should be a finite value greater than 0.
−1951	decimation factor should be greater than 0.
−1950	This function requires that multiple tones be identified in the acquired signal. Increase the amplitude of the component tones, reduce the magnitude threshold, or increase the frequency range to identify additional tones.
−1949	Unsupported frequency spacing. Construct the multitone signal such that the component tones are evenly spaced in frequency.
−1948	custom IMD settings are invalid. low-frequency tone should be less than high-frequency tone. amplitude ratio should be greater than 0. maximum order should be greater than or equal to 2.
−1947	Based on the identified fundamental frequency, no harmonics are contained in the measurement bandwidth. Reduce the frequency of the fundamental tone or increase the measurement bandwidth by increasing the sampling rate.
−1946	maximum harmonic and all harmonics to visualize should be greater than or equal to 2.
−1945	The fundamental tone was not detected. Please make sure that the signal source is connected and/or increase the amplitude of the fundamental tone to be greater than the level of the noise.
−1944	There is insufficient frequency resolution to perform this measurement. Improve the frequency resolution by increasing the number of samples used to compute the FFT and/or decreasing the sampling frequency of the acquisition. Verify that your signals are connected and that an identifiable tone can be found in the frequency range of interest
−1943	This function does not operate on the given spectrum type. This function operates exclusively on FFT Spectrum [complex].
−1942	highpass cutoff frequency should be greater than 0.
−1941	The amplitude of the detected fundamental tone is too low to perform an accurate measurement. Increase the amplitude of the test tone and verify that an identifiable tone can be found in the frequency range of interest. You can also verify that your signals are connected and that each measurement channel is properly grounded.
−1940	The channel info that describes the scaled signals input indicates that weighting has already been applied to the input signal. You should not use the Weighting VIs to apply weighting more than once to a signal. If the signal input to SVL Scale Voltage to EU VI is unweighted, linearly weighted, or Z-weighted, please change the weighting parameter of the channel info cluster to Linear to avoid this error.
−1939	This function does not support the selected weighting.
−1938	There was no spectrum info associated with the input spectra. Some steps that operate on spectra do not preserve the spectrum info, and it is necessary to use the source spectra as the input to this Express step.
−1937	This Express VI must be configured in order to process input signals or perform measurements.
−1936	This human vibration weighting filter does not support the sample rate for this waveform. Supported sample rates are 1000, 2000, 3200, 4000, 5000, 6400, 8000, 10000, 12500, 12800, 16666.666, 20000, 25000, 25600, 33333.333, 50000, 51200 Hz.
−1935	This human vibration weighting filter does not support the sample rate for this waveform. Supported sample rates are 8000, 10000, 12500, 12800, 16666.666, 20000, 25000, 25600, 33333.333, 50000, 51200 Hz.
−1934	Time-domain weighting may be applied to signals with sample rates greater than 4000 Hz. Increase Fs for the simulated signal or increase the sample rate of the acquisition to be at least 4000 Hz.
−1933	This weighting filter does not support the sample rate for this waveform. Supported sample rates are 16666.666, 20000, 22050, 25000, 25600, 33333.333, 40000, 44100, 50000, 51200, 80000, 88200, 96000, 100000, 102400, 196000, 200000, 204800, 500000, and 1000000 [Hz].
−1932	This weighting filter does not support the sample rate for this waveform. Supported sample rates are 4000, 8000, 10000, 11025, 12500, 12800, 16666.666, 20000, 22050, 25000, 25600, 33333.333, 40000, 44100, 50000, 51200, 80000, 88200, 96000, 100000, 102400, 196000, 200000, 204800, 500000, and 1000000 Hz. The SVT Weighting Filter VI may be used to apply A, B, or C weighting to signals with arbitrary sample rate.
−1931	The number of samples should be greater than 0.
−1930	sampling frequency should be greater than 0.
−1929	The array of input waveforms was empty. Verify that the data source is returning valid data.
−1928	You must disable frequency weighting during calibration.
−1927	Channel is overloaded. Adjust input limits so input signal stays in range.
−1926	Calibration signal not detected or frequency of calibration signal is out of tolerance. Make sure calibrator is on, calibrator is applied to the selected device and channel, and all connections are secure. After verifying that the signal is present on the specified channel, check whether the actual frequency of the calibration signal agrees with the specified calibration frequency.
−1925	duration should be greater than 0.
−1924	frequency tolerance should be greater than 0.
−1923	calibration frequency should be greater than 0 and less than sampling frequency divided by 3.
−1922	The specified frequency is not found within the spectrum. This VI requires that frequency be between the lowest bandedge frequency and the highest bandedge frequency of the input octave spectrum.
−1921	The number of elements in the dB references array should equal the number of elements in the scaled signals in array.
−1920	The number of elements in the configuration settings array should equal the number of elements in the input signals array. For example, when scaling to engineering units, the number of elements in the channel info array should equal the number of elements in the waveform array.
−1919	The measurement failed to settle in the number of iterations specified by timeout [iterations].
−1918	This function only operates on phase spectra expressed in radians, degrees, or cycles.
−1917	This human vibration weighting filter does not support the sample rate for this waveform. Supported sample rates are 1000, 2000, 3200, 4000, 5000, 6400, 8000, 10000, 12500, 12800 Hz.
−1915	start frequency should be greater than 0. Stop frequency should be greater than 0. Number of steps should be greater than or equal to 2.
−1914	Single-channel measurements are not supported. Please specify the analog input channels stimulus channel and response channel.
−1913	integration cycles should be greater than or equal to 2.
−1912	block duration should be greater than 0.
−1911	swept sine task should be connected to a shift register.
−1910	Execution modes requiring feedback are not supported.
−1909	f0 should be greater than or equal to 0, and df should be greater than 0.
−1908	Dual-channel measurements require that the input spectra be similar (f0_x = f0_y, df_x = df_y, length_x = length_y).
−1907	The sampling frequency of the input waveform should be greater than 0 (dt greater than 0).
−1906	Multichannel measurements require that each signal has the same sample interval (identical dt or identical dr).
−1905	Multichannel measurements require that each waveform has the same number of samples.
−1904	amplitude should be greater than or equal to 0.
−1903	This measurement does not support the use of Traditional DAQ and DAQmx drivers on the same device at the same time. Please make sure that you are using all Traditional DAQ VIs or all DAQmx VIs in your application.
−1902	This measurement does not support configuration and synchronization of multiple devices. Select a data acquisition device with analog input channels and analog output channels to perform the measurement.
−1901	The maximum test frequency is above the alias-free bandwidth for the specified sample rate. Increase sampling frequency or decrease stop frequency.
1905	VI automatically was reset because number of samples in the input signal changed.
1906	VI automatically was reset because sampling frequency changed.
1907	VI automatically was reset because input signal should be continuous from one block to the next.
1908	VI automatically was reset because channel info changed.
1909	VI automatically was reset because frequency range changed.
1910	VI automatically was reset because number of channels changed.
1913	integration cycles was coerced to 1. integration cycles should be greater than or equal to 1.
1940	VI automatically was reset because weighting changed.
1941	VI automatically was reset because integration type changed.
1942	VI automatically was reset because highpass cutoff frequency changed.
1943	Measurement uncertainty is high. You can decrease the uncertainty in spectrum measurements by improving frequency resolution and signal to noise ratio.
1944	The phase measurement uncertainty is high. Adjust the frequency of the fundamental tone in the test signal so that the period is approximately 10 times the group delay.
1945	expected fundamental frequency is outside frequency range.
1946	maximum harmonic was coerced to be between 2 and highest harmonic less than the Nyquist frequency.
1947	harmonics to visualize was coerced so that each element is between 2 and maximum harmonic.
1950	To satisfy the Shannon Sampling Criterion, decimation factor should be less than time constant divided by 2. Typically, decimation factor of time constant divided by 5 or time constant divided by 10 recommended.
1952	VI automatically was reset because integration time changed.
1953	integration time was coerced to a multiple of the acquisition period. Use a shorter acquisition period to achieve a shorter integration time.
1961	VI automatically was reset because bandwidth changed.
1962	VI automatically was reset because averaging type changed.
1963	frequency range was coerced so that high frequency is less than or equal to the sample rate divided by 2.5 for fractional-octave analysis and less than or equal to the sample rate divided by 3 for full-octave analysis.
1966	This VI has applied window to a signal that was previously windowed. The resulting complex window will prevent some extended measurements from operating on the spectrum. To avoid this warning, apply only one window to the time-domain signal.
1969	maximum harmonic was coerced so that actual maximum harmonic frequency is less than or equal to Nyquist frequency.
1970	frequency range was coerced so that actual start frequency and stop frequency are greater than f0 and less than the maximum frequency in the spectrum.
1971	VI was automatically restarted because averaging parameters changed.
1973	VI automatically was reset because zoom settings changed.
1974	This VI coerced number of lines to provide sufficient resolution for the zoom.
1977	VI was automatically restarted, because the channel name changed. Please make sure that you are not indexing an array of channels into a loop to perform an averaged operation.
1978	VI automatically was restarted because window changed.
1979	VI automatically was restarted because FRF mode changed.
1980	Peak search results might be inaccurate because the spectrum was integrated or weighted in the frequency domain.
1990	No scaling was applied to the data, because previous scaling was detected. This VI is not intended to be used as a units conversion VI.
1992	The existing dB reference in the waveform attributes was overwritten with the specified dB reference.
1997	The waterfall buffer was automatically reset, because z0, dz, or dx changed from the previously buffered data.
4951	Input spectra were converted to linear scale before being written to file in order to conform with the UFF58b standard.
4952	The UFF File has been modified by another process or application.
4953	The magnitude and phase spectra were converted to real and imaginary spectra before being written to file in order to conform with the UFF58b standard.
4968	Text field exceeds the maximum character limit.
4969	When run continuously, only the last data passed through the step is written to file. This step doesn't buffer the data.
21400	The input signal is empty.
21401	order resolution value is too high. order resolution value must be lower than the maximum order to compute.
21402	threshold is out of the range of the tachometer signal.
21403	hysteresis value is not suitable for the tachometer signal. If the slope is Rising, the threshold minus the hysteresis must be within the range of the tachometer signal. If the slope is Falling, the threshold plus the hysteresis must be within the range of the tachometer signal.
21404	Neither the colormap nor the waterfall graph is exported.
21405	start time is greater than end time.
21406	start time is greater than the input signal duration.
21407	The input signal does not have enough samples.
21408	Specify at least one order to track.
21409	channel properties is empty. This VI uses the default configuration where rotation is counter clockwise, probe angle is zero, and the sensor pair is determined by the channel index.
21410	Some channels are not in pairs.
21411	The input array size or attributes does not match the buffered data. The buffer is reset.
21412	The VI output is empty because expected speed is not reached.
21413	Start speed and End speed are switched to match the Run type.
21414	No valid tachometer pulse is detected.

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