Filtered Results

Requirement I/O needs to be hardware-timed. All output values need to simultaneously update at the arrival of the sample clock edge. The application uses the Timed Loop. Solution Use the DAQmx Create Timing ...

This section explains control concepts as implemented in NI-DAQmx. Timing control loops, synchronizing analog input and output, using control algorithms, single-point real-time applications, and setting ...

By default, NI-DAQmx writes samples sequentially beginning with the first sample in the buffer, and each write begins where the previous one left off. The sample where a write begins is called the Current ...

A single routing API now controls all the digital routing for NI measurements devices. Signal routing controls the mapping of digital signals or triggers across hardware such as digital multiplexers or ...

A signal is a means of conveying information. An analog waveform and a digital edge are both examples of signals. The word signal, in this section, refers to the digital edge variety, also known as hardware ...

There are several sources of error when synchronizing measurements: Jitter Stability Accuracy Skew

Skew is a propagation delay that is caused when a signal arrives at two places at different times. For instance, a signal is sent by a controlling device at time T0. A receiving device A acts upon the ...

You can export clocks, triggers, and events. The exported signal can exhibit one of three behaviors. It can rapidly change from its current state and then back again (pulse), change from its current state ...

Devices that support an external voltage reference enable you to maximize the resolution of your device. If the voltages you want to generate do not exceed a certain level and you can supply an external ...

When generating pulses, you can generate either a single pulse, a finite pulse train, or a continuous pulse train. By default, single pulses are generated unless you use the Timing function/VI with the ...

Glitching refers to the generation of a waveform in which, when transitioning from old samples in the buffer to new samples, a mixture of old and new samples is generated rather than just the new samples. ...

You can create a number of different types of virtual channels, depending on the signal type—analog, digital, or counter—and direction (input or output). These channels can be either global virtual channels ...

Stability describes how well the clock frequency resists fluctuations. Factors that can cause the frequency to fluctuate include variations in temperature, time (aging), supply voltage, shock, vibration, ...

The limitation on t0 is that NI-DAQmx calculates the starting time for the task when data is read the first time. At this time, NI-DAQmx calculates the starting time for the task by reading the current ...

If the measurement or generation is finite, the task is done when you acquire or generate the final sample or when you call the Stop Task function/VI. If the measurement or generation is continuous (including ...

Use this high-frequency measurement method if you measure a digital frequency or period of a signal with a high frequency component. To perform measurements using this method in NI-DAQmx, a paired counter ...

In hardware-timed single-point sample mode, samples are acquired or generated continuously using hardware timing and no buffer. You must use the sample clock or change detection timing types. No other ...

Immediate routing is not associated with any task. An immediate route is a pair of fully qualified terminal names specifying the source and destination of the route. When an immediate route is created, ...

Digital lines and ports are important parts of a digital input/output system. Line A line is an individual signal. It refers to a physical terminal. The data that the line carries are called bits, binary ...

Sample Clock Timebase synchronization allows you to synchronize devices at different rates. Use Sample Clock Timebase synchronization to synchronize a combination of devices for which Reference Clock, ...

Devices use either multiplexed or simultaneous sampling. Simultaneous sampling devices have an ADC for each analog channel and can sample from all channels at the same time, as shown in the following figure. ...

NI-DAQmx assigns names to local virtual channels that you create programmatically with the NI-DAQmx API when you do not provide a name for each local virtual channel. Physical Channel Names Name To Assign ...

Task-based routing is the most common form of routing. When you create a hardware trigger or export a hardware signal, you create a task-based route. These routes are embedded in a task. You can use Export ...

Some state transitions require the task to move through one or more states to reach the specified state. For example, if the task is in the Unverified state, and you call the Control Task function/VI, ...

For on-demand logging, NI-DAQmx creates a Time channel in the TDMS file that contains timestamp data. The Time channel can be omitted with the WfmAttr Read attribute/property, which specifies the data ...

A task is a collection of one or more virtual channels with timing, triggering, and other properties. Conceptually, a task represents a measurement or generation you want to perform. All channels in a ...

With sample clock timing or burst handshake timing, the Pause Trigger pauses an ongoing acquisition or generation. Deasserting this trigger resumes an acquisition or generation. Depending on your device, ...

A terminal is a named location where a signal is either generated (output or produced) or acquired (input or consumed). A terminal that can output only one signal is often named after that signal. A terminal ...

Use this syntax to refer to physical channels and groups of physical channels in NI-DAQmx. Physical Channel Names Physical channel names consist of a device identifier and a slash (/) followed by a channel ...

The relative priority of parallel processes is important in a control application. Because LabVIEW is multi-threaded, you can separate your application into individual tasks, each with its own priority. ...

Showing 91-120 of 879 results
4 of 30 pages