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Writes multiple raw, 32-bit signed integer samples to a task. Use this instance for devices that use 32-bit signed integers as the internal representation of a sample. LabVIEW NXG does not support FPGA ...

Writes multiple raw, 16-bit unsigned integer samples to a task. Use this instance for devices that use 16-bit unsigned integers as the internal representation of a sample. LabVIEW NXG does not support ...

Use the 4-wire resistance method, as shown in the following figure, to measure resistances of less than 100 Ω. The 4-wire method is more accurate than the 2-wire method. The 4-wire method uses four test ...

When performing a buffered time measurement of a digital signal, the initial sample is often invalid. The following devices detect such samples and discard them. Bus-powered M Series USB devices Parallel ...

When you use MAX or the NI-DAQmx API to reset a device, NI-DAQmx sets terminals and output channels to an initialized state. Digital I/O Lines NI-DAQmx sets all digital I/O lines to the configured power-up ...

You can configure each AI channel of your DSA device to be either AC or DC coupled, with the exception of the NI 9233, the NI 4495, the NI 4496, and the NI 4498 devices, which are AC coupled only. If you ...

The output of bridge-based sensors is relatively small. For example, most strain gage bridges and strain-based transducers output less than 10 mV/V, or 10 millivolts of output per volt of excitation voltage. ...

Two NI-DAQmx Read attributes/properties allow you to check if the PLL was unlocked during data acquisition for a task. The first is PLL.UnlockedChansExist. This attribute/property returns a Boolean true ...

Writes a new pulse high tick count and low tick count to a counter output task that contains a single channel. LabVIEW NXG does not support FPGA devices Not supported in VIs that run in a web application ...

Writes a new pulse high time and low time to a counter output task that contains a single channel. LabVIEW NXG does not support FPGA devices Not supported in VIs that run in a web application DAQmx Write ...

An RTD is a temperature sensing device with resistance that increases with temperature. An RTD is usually constructed with wire coil or deposited film of pure metal. RTDs can be made of different metals ...

On an NI 4300 or NI 433x device, you can either acquire a signal present on the I/O connector, or you can acquire an onboard signal, via an internal multiplexer. The channels available on this multiplexer ...

On an S Series device, you can either acquire a signal present on the I/O connector, or you can acquire a signal that is being generated from the internal calibration multiplexer. The channels available ...

At very low sample rates, the anti-aliasing filters for AI channels on DSA devices, C Series Delta-Sigma devices, NI 4330, and NI 4331 devices may not completely reject all out-of-band signals. This is ...

Internal Channel Name Description _aignd_vs_aignd A differential terminal with the positive and negative terminals both connected to the ground reference for analog input. _ao0_vs_aognd A differential ...

The following devices have multiple counters and support adding multiple counter channels to the same task. NI 9361

Depending on your application, you may use several different kinds of sensors. Some commonly used ones are strain gages, thermocouples, thermistors, angular encoders, linear encoders, bridge-based sensors, ...

One of the most important parameters of an analog input or output system is the rate at which the measurement device samples an incoming signal or generates the output signal. The sampling rate, which ...

You can measure strain with a strain gage, which is a device with electrical resistance that varies in proportion to the amount of strain in the device, and with signal conditioning. When using a strain ...

Signal connections vary depending on your device, connector block, and signal conditioning module. The DAQ Assistant contains connection diagrams that show terminal connections for all common analog input ...

The type of input signal source (grounded or floating) and the configuration of the measurement system (differential, single-ended, pseudodifferential) determine how you connect signals to measurement ...

Signal connections vary depending on your device, connector block, and signal conditioning module. The following figure shows how to make analog output connections for a typical NI device. For terminals ...

The number of digital lines varies from device to device. The following figure shows signal connections for three typical DIO applications. The figure shows PO <0..3> configured for digital input and PO ...

Counters measure and generate digital signals. Counters are used commonly to count edges and for time measurements, such as measuring digital frequency or the period of a signal. The signal connections ...

The following figure depicts the measurement system overview, showing the path of real-world physical phenomena to your measurement application. Sensors and transducers detect physical phenomena. Signal ...

Breaking the hot junction of a thermocouple or disconnecting a thermocouple signal results in an open thermocouple channel. This causes the channel to return invalid data. Using open thermocouple detection, ...

A differential measurement system has neither of its inputs tied to a fixed reference, such as earth or building ground. A differential measurement system is similar to a floating signal source in that ...

Use windowing, or smoothing windows, to minimize spectral leakage associated with truncated waveforms. Spectral Leakage Spectral leakage is a phenomenon whereby the measured spectral energy appears to ...

A digital signal has two discrete levels—a high and a low level. One example of a digital signal is a transistor-transistor logic (TTL) compatible signal. A TTL-compatible signal has the following characteristics: ...

The duty cycle is a characteristic of a pulse. Use the following equation to calculate the duty cycle of a pulse whose high time and low time are unequal: Duty Cycle = High Time/Pulse Period where Pulse ...

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