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MLS parameters specifies the generated maximum length sequence (MLS) amplitude. The test signal is an MLS signal with a sample length 10 times the maximum expected propagation delay.
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amplitude [V peak] specifies the height of the test pulse in volts-peak. The default is 1.40 V peak.
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smooth pulse parameters specifies the width and height of the test pulse. The test pulse is a single cycle of a sine wave windowed with a Hanning window so that the transitions at the edges of the pulse are smooth.
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pulse width [samples] specifies the width of the test pulse in number of samples. The default is 20 samples.  | Note The pulse width and the sampling frequency determine the frequency content of the generated pulse. Verify that the selected coupling does not distort the pulse. Use a narrower pulse width to avoid distortion of the pulse when using AC coupling. |
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amplitude [V peak] specifies the height of the test pulse in volts-peak. The default is 1.40 V peak.
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test signal specifies the test signal used to measure propagation delay [samples].
| 0 | Smooth pulse (default) |
| 1 | MLS |
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output configuration specifies the configuration parameters to use for the output channel.
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AO physical channel specifies the names of the physical channels to use to create virtual channels. The control lists all physical channels on devices and modules installed in the system.
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max value (10 V) specifies the maximum value of the signal in volts. The default is 5.00 V.
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min value (-10 V) specifies the minimum value of the signal in volts. The default is –5.00 V.
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terminal configuration specifies the input terminal configuration of the selected channel.
| 0 | Default—The default device terminal configuration. Refer to the device documentation for information about the default terminal configuration. |
| 1 | RSE—The referenced single-ended (RSE) configuration measures the signal with respect to a ground directly connected to the measurement system ground. |
| 2 | NRSE—The nonreferenced single-ended (NRSE) configuration measures the signal with respect to a single ground, but the potential may differ from the measurement system ground. |
| 3 | Differential—The differential configuration has neither of its inputs tied to a fixed reference, such as earth or building ground. |
| 4 | Pseudodifferential—The pseudodifferential configuration references the positive and negative inputs for the channel to measurement system ground through different impedances. The pseudodifferential terminal configuration measures the difference between the positive and negative inputs. |
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input configuration specifies the configuration parameters to use for the input channel.
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AI physical channel specifies the names of the physical channels to use to create virtual channels. The control lists all physical channels on devices and modules installed in the system.
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max value (10 V) specifies the maximum value of the signal in volts. The default is 5.00 V.
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min value (-10 V) specifies the minimum value of the signal in volts. The default is –5.00 V.
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terminal configuration specifies the input terminal configuration of the selected channel.
| 0 | Default—The default device terminal configuration. Refer to the device documentation for information about the default terminal configuration. |
| 1 | RSE—The referenced single-ended (RSE) configuration measures the signal with respect to a ground directly connected to the measurement system ground. |
| 2 | NRSE—The nonreferenced single-ended (NRSE) configuration measures the signal with respect to a single ground, but the potential may differ from the measurement system ground. |
| 3 | Differential—The differential configuration has neither of its inputs tied to a fixed reference, such as earth or building ground. |
| 4 | Pseudodifferential—The pseudodifferential configuration references the positive and negative inputs for the channel to measurement system ground through different impedances. The pseudodifferential terminal configuration measures the difference between the positive and negative inputs. |
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DSA channel settings specifies the input coupling and integrated electronic piezoelectric (IEPE) excitation applied if the measurement is performed with a DSA device.
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coupling specifies the coupling setting of the selected channel.
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enable IEPE excitation specifies whether the onboard current excitation is enabled to power integrated electronic piezoelectric (IEPE) sensors. The default is FALSE, meaning that the onboard excitation is disabled.
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IEPE current [mA] specifies the current value in mA for the onboard integrated electronic piezoelectric (IEPE) current excitation. The default is 4.0 mA.
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maximum propagation delay [samples] specifies the maximum expected propagation delay for each iteration in number of samples. The default is 150 samples.
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number of averages specifies the number of measurements used to compute the average propagation delay [samples]. The default is 10.
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sample frequency [Hz] specifies the update rate to use on the output channel and the sampling rate to use on the input channel in units of samples per second. The default is 50,000 Hz.
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error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
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generated and acquired waveforms returns the test signal generated on the output channel and the signal acquired on the input channel.
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average propagation delay [samples] returns the average value in propagation delay [samples] rounded up to the nearest sample.
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propagation delay returns the propagation delay computed for each iteration.
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error out contains error information. This output provides standard error out functionality.
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