 |
force/exp settings contains the parameters for the force and exponential windows.
 |
force window [%] specifies the length of the force window that is used if window is set to Force-Exponential.
force window [%] specifies the duration of the force window as a percentage of the total duration of the signal. Setting force window % at 100 has the effect of not applying any window on the stimulus signal.
|
|
exp window [%] specifies the decay rate of the exponential window that is used if window is set to Force-Exponential.
exp window [%] specifies the remaining level of the applied exponential window at the end of the signal as a percentage.
|
|
 |
FRF mode specifies how to compute the frequency response function (FRF). FRF mode determines whether H1, H2, or H3 is computed when performing frequency response measurements.
 | Note FRF mode only applies to RMS or vector averaging. FRF mode changes the result in RMS averaging but not in vector averaging. In vector averaging, H1 = H2 = H3. |
|
 |
stimulus signal X contains the scaled signal acquired from the stimulus channel expressed in the selected engineering units.
|
|
response signal Y contains the scaled response signal expressed in the selected engineering units.
|
 |
window specifies the time-domain window to use.
| Note When you use a Force-Exponential window, wire force/exp settings. |
| 0 | None | | 1 | Hanning (default) | | 2 | Hamming | | 3 | Blackman-Harris | | 4 | Exact Blackman | | 5 | Blackman | | 6 | Flat Top | | 7 | 4 Term B-Harris | | 8 | 7 Term B-Harris | | 9 | Low Sidelobe | | 10 | Force-Exponential | | 11 | Blackman Nuttall | | 12 | Triangle | | 13 | Bartlett-Hanning | | 14 | Bohman | | 15 | Parzen | | 16 | Welch | | 17 | Kaiser | | 18 | Dolph-Chebyshev | | 19 | Gaussian |
|
 |
view defines how the different results from this VI are returned.
view allows you to choose whether magnitude results are displayed in dB, phase results are unwrapped, and phase results are converted from radians to degrees.
 |
dB On specifies if results are expressed in decibels. The default is TRUE.
|
|
convert to degree specifies whether the phase results are converted from radians to degrees. The default is FALSE, which means that results are expressed in radians.
|
|
unwrap phase specifies whether to unwrap the phase. Unwrapping eliminates discontinuities that have an absolute value greater than pi. The default is FALSE, meaning the phase is not unwrapped.
When unwrap phase is TRUE, the phase is unwrapped.
|
|
 |
error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Refer to Controlling Error Notification to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
|
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
|
 |
code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
 |
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
|
|
|
averaging parameters defines how the averaging is computed.
| Note When averaging mode is set to No averaging, the VI ignores the weighting mode, number of averages, and linear mode settings. |
|
averaging mode specifies the averaging mode.
| 0 | No averaging (Default) | | 1 | Vector averaging | | 2 | RMS averaging |
|
|
weighting mode specifies the weighting mode.
| Note RMS and vector averaging support linear weighting and exponential weighting. |
| 0 | Linear | | 1 | Exponential (default) |
|
|
number of averages specifies the number of averages used by the selected weighting mode.
If weighting mode is set to Linear, the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
|
|
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear. If you set weighting mode to Exponential, linear mode is ignored.
| 0 | One shot—(default) Specifies that the averaging process stops once the value of number of averages is reached. | | 1 | Auto restart—Specifies that the averaging process automatically restarts after the value of number of averages is reached. |
|
|
|
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
|
 |
coherence contains information about the coherence.
 |
f0 is the start frequency of the coherence expressed in hertz.
|
|
df is the frequency resolution of the coherence expressed in hertz.
|
 |
coherence returns the coherence.
|
|
|
magnitude returns the magnitude of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
magnitude returns the magnitude of the frequency response.
|
|
 |
magnitude unit label returns the unit label for the selected magnitude units.
|
|
phase returns the phase of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
phase returns the phase of the frequency response.
|
|
|
phase unit label returns the unit label for the selected phase units.
|
|
spectrum info returns information about the spectrum needed by the Spectrum Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs. Do not modify the spectrum info values.
|
 |
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
 |
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
|
 |
code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
|
|
|
averages completed returns the number of averages completed by the VI at that time.
|
|
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters. Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging.
|
Use this VI to compute FRFs when you have multiple response channels and multiple stimulus channels, and you want to compute frequency responses between every combination of stimulus and response.
|
force/exp settings contains the parameters for the force and exponential windows.
|
force window [%] specifies the length of the force window that is used if window is set to Force-Exponential.
force window [%] specifies the duration of the force window as a percentage of the total duration of the signal. Setting force window % at 100 has the effect of not applying any window on the stimulus signal.
|
|
exp window [%] specifies the decay rate of the exponential window that is used if window is set to Force-Exponential.
exp window [%] specifies the remaining level of the applied exponential window at the end of the signal as a percentage.
|
|
|
FRF mode specifies how to compute the frequency response function (FRF). FRF mode determines whether H1, H2, or H3 is computed when performing frequency response measurements.
| Note FRF mode only applies to RMS or vector averaging. FRF mode changes the result in RMS averaging but not in vector averaging. In vector averaging, H1 = H2 = H3. |
|
 |
stimulus signals X contains the scaled signals acquired from the stimulus channels expressed in the selected engineering units.
|
|
response signals Y contains the scaled signals acquired from the response channels expressed in the selected engineering units.
|
|
window specifies the time-domain window to use.
| Note When you use a Force-Exponential window, wire force/exp settings. |
| 0 | None | | 1 | Hanning (default) | | 2 | Hamming | | 3 | Blackman-Harris | | 4 | Exact Blackman | | 5 | Blackman | | 6 | Flat Top | | 7 | 4 Term B-Harris | | 8 | 7 Term B-Harris | | 9 | Low Sidelobe | | 10 | Force-Exponential | | 11 | Blackman Nuttall | | 12 | Triangle | | 13 | Bartlett-Hanning | | 14 | Bohman | | 15 | Parzen | | 16 | Welch | | 17 | Kaiser | | 18 | Dolph-Chebyshev | | 19 | Gaussian |
|
|
view defines how the different results from this VI are returned.
view allows you to choose whether magnitude results are displayed in dB, phase results are unwrapped, and phase results are converted from radians to degrees.
|
dB On specifies if results are expressed in decibels. The default is TRUE.
|
|
convert to degree specifies whether the phase results are converted from radians to degrees. The default is FALSE, which means that results are expressed in radians.
|
|
unwrap phase specifies whether to unwrap the phase. Unwrapping eliminates discontinuities that have an absolute value greater than pi. The default is FALSE, meaning the phase is not unwrapped.
When unwrap phase is TRUE, the phase is unwrapped.
|
|
|
error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Refer to Controlling Error Notification to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
|
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
|
|
code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
|
|
|
averaging parameters defines how the averaging is computed.
| Note When averaging mode is set to No averaging, the VI ignores the weighting mode, number of averages, and linear mode settings. |
|
averaging mode specifies the averaging mode.
| 0 | No averaging (Default) | | 1 | Vector averaging | | 2 | RMS averaging |
|
|
weighting mode specifies the weighting mode.
| Note RMS and vector averaging support linear weighting and exponential weighting. |
| 0 | Linear | | 1 | Exponential (default) |
|
|
number of averages specifies the number of averages used by the selected weighting mode.
If weighting mode is set to Linear, the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
|
|
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear. If you set weighting mode to Exponential, linear mode is ignored.
| 0 | One shot—(default) Specifies that the averaging process stops once the value of number of averages is reached. | | 1 | Auto restart—Specifies that the averaging process automatically restarts after the value of number of averages is reached. |
|
|
|
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
|
 |
coherence contains information about the coherence.
|
f0 is the start frequency of the coherence expressed in hertz.
|
|
df is the frequency resolution of the coherence expressed in hertz.
|
|
coherence returns the coherence.
|
|
|
magnitude [dB EUy/EUx] returns the magnitude of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
magnitude returns the magnitude of the frequency response.
|
|
 |
magnitude unit labels returns the unit labels for the selected magnitude units.
|
|
phase returns the phase of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
phase returns the phase of the frequency response.
|
|
|
phase unit labels returns the unit labels for the selected phase units.
|
|
spectra info contains information about the spectra needed by the Frequency Analysis Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs.
|
|
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
|
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
|
|
code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
|
|
|
averages completed returns the number of averages completed by the VI at that time.
|
|
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters. Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging.
|
Use this VI to compute FRFs when you have multiple pairs of single-input, single-output measurements.
|
force/exp settings contains the parameters for the force and exponential windows.
|
force window [%] specifies the length of the force window that is used if window is set to Force-Exponential.
force window [%] specifies the duration of the force window as a percentage of the total duration of the signal. Setting force window % at 100 has the effect of not applying any window on the stimulus signal.
|
|
exp window [%] specifies the decay rate of the exponential window that is used if window is set to Force-Exponential.
exp window [%] specifies the remaining level of the applied exponential window at the end of the signal as a percentage.
|
|
|
FRF mode specifies how to compute the frequency response function (FRF). FRF mode determines whether H1, H2, or H3 is computed when performing frequency response measurements.
| Note FRF mode only applies to RMS or vector averaging. FRF mode changes the result in RMS averaging but not in vector averaging. In vector averaging, H1 = H2 = H3. |
|
|
stimulus signals X contains the scaled signals acquired from the stimulus channels expressed in the selected engineering units.
|
|
response signals Y contains the scaled signals acquired from the response channels expressed in the selected engineering units.
|
|
window specifies the time-domain window to use.
| Note When you use a Force-Exponential window, wire force/exp settings. |
| 0 | None | | 1 | Hanning (default) | | 2 | Hamming | | 3 | Blackman-Harris | | 4 | Exact Blackman | | 5 | Blackman | | 6 | Flat Top | | 7 | 4 Term B-Harris | | 8 | 7 Term B-Harris | | 9 | Low Sidelobe | | 10 | Force-Exponential | | 11 | Blackman Nuttall | | 12 | Triangle | | 13 | Bartlett-Hanning | | 14 | Bohman | | 15 | Parzen | | 16 | Welch | | 17 | Kaiser | | 18 | Dolph-Chebyshev | | 19 | Gaussian |
|
|
view defines how the different results from this VI are returned.
view allows you to choose whether magnitude results are displayed in dB, phase results are unwrapped, and phase results are converted from radians to degrees.
|
dB On specifies if results are expressed in decibels. The default is TRUE.
|
|
convert to degree specifies whether the phase results are converted from radians to degrees. The default is FALSE, which means that results are expressed in radians.
|
|
unwrap phase specifies whether to unwrap the phase. Unwrapping eliminates discontinuities that have an absolute value greater than pi. The default is FALSE, meaning the phase is not unwrapped.
When unwrap phase is TRUE, the phase is unwrapped.
|
|
|
error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Refer to Controlling Error Notification to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
|
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
|
|
code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
|
|
|
averaging parameters defines how the averaging is computed.
| Note When averaging mode is set to No averaging, the VI ignores the weighting mode, number of averages, and linear mode settings. |
|
averaging mode specifies the averaging mode.
| 0 | No averaging (Default) | | 1 | Vector averaging | | 2 | RMS averaging |
|
|
weighting mode specifies the weighting mode.
| Note RMS and vector averaging support linear weighting and exponential weighting. |
| 0 | Linear | | 1 | Exponential (default) |
|
|
number of averages specifies the number of averages used by the selected weighting mode.
If weighting mode is set to Linear, the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
|
|
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear. If you set weighting mode to Exponential, linear mode is ignored.
| 0 | One shot—(default) Specifies that the averaging process stops once the value of number of averages is reached. | | 1 | Auto restart—Specifies that the averaging process automatically restarts after the value of number of averages is reached. |
|
|
|
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
|
 |
coherence contains information about the coherence.
|
coherence contains information about the coherence.
|
f0 is the start frequency of the coherence expressed in hertz.
|
|
df is the frequency resolution of the coherence expressed in hertz.
|
|
coherence returns the coherence.
|
|
|
|
magnitude returns the magnitude of the frequency response.
|
magnitude returns the magnitude of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
magnitude returns the magnitude of the frequency response.
|
|
|
 |
magnitude unit labels returns the unit labels for the selected magnitude units.
|
|
phase returns the phase of the frequency response.
|
phase returns the phase of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
phase returns the phase of the frequency response.
|
|
|
|
phase unit labels returns the unit labels for the selected phase units.
|
|
spectra info contains information about the spectra needed by the Frequency Analysis Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs.
|
|
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
|
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
|
|
code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
|
|
|
averages completed returns the number of averages completed by the VI at that time.
|
|
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters. Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging.
|
Use this VI to compute FRFs when you have multiple response channels and one stimulus channel.
|
force/exp settings contains the parameters for the force and exponential windows.
|
force window [%] specifies the length of the force window that is used if window is set to Force-Exponential.
force window [%] specifies the duration of the force window as a percentage of the total duration of the signal. Setting force window % at 100 has the effect of not applying any window on the stimulus signal.
|
|
exp window [%] specifies the decay rate of the exponential window that is used if window is set to Force-Exponential.
exp window [%] specifies the remaining level of the applied exponential window at the end of the signal as a percentage.
|
|
|
FRF mode specifies how to compute the frequency response function (FRF). FRF mode determines whether H1, H2, or H3 is computed when performing frequency response measurements.
| Note FRF mode only applies to RMS or vector averaging. FRF mode changes the result in RMS averaging but not in vector averaging. In vector averaging, H1 = H2 = H3. |
|
|
stimulus signal X contains the scaled signal acquired from the stimulus channel expressed in the selected engineering units.
|
|
response signals Y contains the scaled signals acquired from the response channels expressed in the selected engineering units.
|
|
window specifies the time-domain window to use.
| Note When you use a Force-Exponential window, wire force/exp settings. |
| 0 | None | | 1 | Hanning (default) | | 2 | Hamming | | 3 | Blackman-Harris | | 4 | Exact Blackman | | 5 | Blackman | | 6 | Flat Top | | 7 | 4 Term B-Harris | | 8 | 7 Term B-Harris | | 9 | Low Sidelobe | | 10 | Force-Exponential | | 11 | Blackman Nuttall | | 12 | Triangle | | 13 | Bartlett-Hanning | | 14 | Bohman | | 15 | Parzen | | 16 | Welch | | 17 | Kaiser | | 18 | Dolph-Chebyshev | | 19 | Gaussian |
|
|
view defines how the different results from this VI are returned.
view allows you to choose whether magnitude results are displayed in dB, phase results are unwrapped, and phase results are converted from radians to degrees.
|
dB On specifies if results are expressed in decibels. The default is TRUE.
|
|
convert to degree specifies whether the phase results are converted from radians to degrees. The default is FALSE, which means that results are expressed in radians.
|
|
unwrap phase specifies whether to unwrap the phase. Unwrapping eliminates discontinuities that have an absolute value greater than pi. The default is FALSE, meaning the phase is not unwrapped.
When unwrap phase is TRUE, the phase is unwrapped.
|
|
|
error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Refer to Controlling Error Notification to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
|
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
|
|
code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
|
|
|
averaging parameters defines how the averaging is computed.
| Note When averaging mode is set to No averaging, the VI ignores the weighting mode, number of averages, and linear mode settings. |
|
averaging mode specifies the averaging mode.
| 0 | No averaging (Default) | | 1 | Vector averaging | | 2 | RMS averaging |
|
|
weighting mode specifies the weighting mode.
| Note RMS and vector averaging support linear weighting and exponential weighting. |
| 0 | Linear | | 1 | Exponential (default) |
|
|
number of averages specifies the number of averages used by the selected weighting mode.
If weighting mode is set to Linear, the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
|
|
linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear. If you set weighting mode to Exponential, linear mode is ignored.
| 0 | One shot—(default) Specifies that the averaging process stops once the value of number of averages is reached. | | 1 | Auto restart—Specifies that the averaging process automatically restarts after the value of number of averages is reached. |
|
|
|
restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
|
|
coherence contains information about the coherence.
|
coherence contains information about the coherence.
|
f0 is the start frequency of the coherence expressed in hertz.
|
|
df is the frequency resolution of the coherence expressed in hertz.
|
|
coherence returns the coherence.
|
|
|
|
magnitude returns the magnitude of the frequency response.
|
magnitude returns the magnitude of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
magnitude returns the magnitude of the frequency response.
|
|
|
|
magnitude unit labels returns the unit labels for the selected magnitude units.
|
|
phase returns the phase of the frequency response.
|
phase returns the phase of the frequency response.
|
f0 returns the start frequency, in hertz, of the spectrum.
|
|
df returns the frequency resolution, in hertz, of the spectrum.
|
|
phase returns the phase of the frequency response.
|
|
|
|
phase unit labels returns the unit labels for the selected phase units.
|
|
spectra info contains information about the spectra needed by the Frequency Analysis Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs.
|
|
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
|
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
|
|
code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
|
|
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
|
|
|
averages completed returns the number of averages completed by the VI at that time.
|
|
averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters. Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging.
|
Use this VI to compute FRFs when you have one response channel and multiple stimulus channels.
|
force/exp settings contains the parameters for the force and exponential windows.
|
force window [%] specifies the length of the force window that is used if window is set to Force-Exponential.
force window [%] specifies the duration of the force window as a percentage of the total duration of the signal. Setting force window % at 100 has the effect of not applying any window on the stimulus signal.
|
|
exp window [%] specifies the decay rate of the exponential window that is used if window is set to Force-Exponential.
exp window [%] specifies the remaining level of the applied exponential window at the end of the signal as a percentage.
|
|
|
FRF mode specifies how to compute the frequency response function (FRF). FRF mode determines whether H1, H2, or H3 is computed when performing frequency response measurements.
| Note FRF mode only applies to RMS or vector averaging. FRF mode changes the result in RMS averaging but not in vector averaging. In vector averaging, H1 = H2 = H3. |
|
|
stimulus signals X contains the scaled signals acquired from the stimulus channels expressed in the selected engineering units.
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response signal Y contains the scaled response signal expressed in the selected engineering units.
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window specifies the time-domain window to use.
| Note When you use a Force-Exponential window, wire force/exp settings. |
| 0 | None | | 1 | Hanning (default) | | 2 | Hamming | | 3 | Blackman-Harris | | 4 | Exact Blackman | | 5 | Blackman | | 6 | Flat Top | | 7 | 4 Term B-Harris | | 8 | 7 Term B-Harris | | 9 | Low Sidelobe | | 10 | Force-Exponential | | 11 | Blackman Nuttall | | 12 | Triangle | | 13 | Bartlett-Hanning | | 14 | Bohman | | 15 | Parzen | | 16 | Welch | | 17 | Kaiser | | 18 | Dolph-Chebyshev | | 19 | Gaussian |
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view defines how the different results from this VI are returned.
view allows you to choose whether magnitude results are displayed in dB, phase results are unwrapped, and phase results are converted from radians to degrees.
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dB On specifies if results are expressed in decibels. The default is TRUE.
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convert to degree specifies whether the phase results are converted from radians to degrees. The default is FALSE, which means that results are expressed in radians.
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unwrap phase specifies whether to unwrap the phase. Unwrapping eliminates discontinuities that have an absolute value greater than pi. The default is FALSE, meaning the phase is not unwrapped.
When unwrap phase is TRUE, the phase is unwrapped.
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error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Refer to Controlling Error Notification to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
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code is the error or warning code. The default is 0.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
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averaging parameters defines how the averaging is computed.
| Note When averaging mode is set to No averaging, the VI ignores the weighting mode, number of averages, and linear mode settings. |
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averaging mode specifies the averaging mode.
| 0 | No averaging (Default) | | 1 | Vector averaging | | 2 | RMS averaging |
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weighting mode specifies the weighting mode.
| Note RMS and vector averaging support linear weighting and exponential weighting. |
| 0 | Linear | | 1 | Exponential (default) |
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number of averages specifies the number of averages used by the selected weighting mode.
If weighting mode is set to Linear, the measurement stops or automatically restarts after the value of number of averages has been reached. Whether the measurement stops or automatically restarts depends on the linear mode setting.
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linear mode specifies the behavior of the averaging if you set the value of the weighting mode parameter to Linear. If you set weighting mode to Exponential, linear mode is ignored.
| 0 | One shot—(default) Specifies that the averaging process stops once the value of number of averages is reached. | | 1 | Auto restart—Specifies that the averaging process automatically restarts after the value of number of averages is reached. |
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restart averaging specifies if the selected averaging process has to be restarted. The default is FALSE. When you call this VI for the first time, the averaging process restarts automatically.
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coherence contains information about the coherence.
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coherence contains information about the coherence.
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f0 is the start frequency of the coherence expressed in hertz.
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df is the frequency resolution of the coherence expressed in hertz.
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coherence returns the coherence.
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magnitude returns the magnitude of the frequency response.
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magnitude returns the magnitude of the frequency response.
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f0 returns the start frequency, in hertz, of the spectrum.
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df returns the frequency resolution, in hertz, of the spectrum.
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magnitude returns the magnitude of the frequency response.
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magnitude unit labels returns the unit labels for the selected magnitude units.
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phase returns the phase of the frequency response.
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phase returns the phase of the frequency response.
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f0 returns the start frequency, in hertz, of the spectrum.
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df returns the frequency resolution, in hertz, of the spectrum.
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phase returns the phase of the frequency response.
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phase unit labels returns the unit labels for the selected phase units.
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spectra info contains information about the spectra needed by the Frequency Analysis Extended Measurements VIs, the Waterfall Display VIs, the Distortion VIs, and the Single Tone Measurements VIs.
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
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code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
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averages completed returns the number of averages completed by the VI at that time.
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averaging done returns TRUE when averages completed is greater than or equal to the number of averages specified in averaging parameters. Otherwise, averaging done returns FALSE. averaging done is always TRUE if the selected averaging mode is No averaging.
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Frequency response is typically an averaged measurement. Each block of data corresponds to a single FFT block and must be passed individually to the SVFA Frequency Response (Mag-Phase) VI.
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