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To measure analog signals, you need to know the signal source—grounded or floating. You also must consider the measurement system—differential, referenced single-ended, or nonreferenced single-ended.

The first is ExternalOvervoltageChansExist. This attribute/property returns a Boolean true if one or more channels experience an external overvoltage condition. The second is ExternalOvervoltageChans. ...

Referenced and nonreferenced single-ended measurement systems are similar to grounded sources in that the measurement is made with respect to ground. A referenced single-ended (RSE) measurement system ...

An ideal differential measurement system responds only to the potential difference between its two terminals—the positive (+) and negative (–) inputs. Any voltage measured with respect to the instrumentation ...

Resolution is the smallest amount of input signal change that a device or sensor can detect. The number of bits used to represent an analog signal determines the resolution of the ADC. You can compare ...

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 ...

The following table lists common platinum RTD types and standards. All of these RTD types are supported in NI-DAQmx. Notice that there are some shared standards. The TCR and the Callendar-Van Dusen coefficients ...

RVDTs are the rotational version of LVDTs and generally operate over an angular range of ±30°–70°. They are available in servo-mount and can rotate through 360° without stopping. RVDTs require special ...

The three most commonly used transducers for temperature are thermocouples, resistance temperature detectors (RTDs), and thermistors. The following table illustrates some of the capabilities and limitations ...

Signal analysis is the process of transforming an acquired signal to extract information about the signal, filter noise from the signal, and present the signal in a more understandable form than the raw ...

Sensors can generate electrical signals to measure physical phenomena, such as temperature, force, sound, or light. To measure signals from transducers, you must convert them into a form that a DAQ device ...

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 ...

Internal channels for the FD-11613 The following internal channels are available. Internal Channel Name Description _cjtemp0 This channel is used for cold-junction compensation. _cjtemp1 This channel is ...

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 ...

A buffer is a temporary storage in computer memory for acquired or to-be-generated samples. Typically this storage is allocated from your computer's memory and is also called the task buffer. For input ...

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 ...

You can specify the size of the buffer by calling the DAQmx Configure Buffer function/VI, by specifying the buffer size attribute/property in the buffer property node, or by writing a number of pulse specifications ...

Synchronized operations are created by routing timing and control signals. Synchronization can be within a single device—for instance, synchronizing analog input and analog output on an M Series device—or ...

A two pulse encoder is a position measurement sensor that has two channels, A and B. When the encoder is moved, either signal A or signal B on the encoder pulses. A pulse on signal A represents a movement ...

Most synchronization applications involve using a signal from another device. For example, when performing Sample Clock synchronization, a device or set of devices use the Sample Clock from another device. ...

On devices with built-in cold-junction compensation (CJC) channels, the CJC channel is read once per sample clock edge.

Several methods exist for synchronizing devices, depending on the devices involved and the requirements of the application. Start Trigger Sample Clock Reference Clock Master Timebase Sample Clock Timebase ...

Several conditions cause a task to abort: To explicitly abort a task, call the DAQmx Control Task function/VI with the Action parameter set to Abort. In general, aborting a task is not a normal operation. ...

When a value you set cannot be met exactly, NI-DAQmx sometimes adjusts—or coerces—that value to a valid one. Coercion often occurs when an attribute/property supports a set of discrete ranges. After you ...

The input and output operations along with any processing performed during a single sample clock period are called I/O cycles. I/O cycles can consist of reads or writes only, but an I/O cycle in a typical ...

In NI-DAQmx 8.0 or later, you can set up distributed applications to combine remote data applications using the NI-DAQmx I/O Server. For instance, you can configure a central computer to monitor other ...

You can use the Is Task Done function/VI for applications in which you need to monitor the progress of a task running in one section of your application from another section of your application. In general, ...

An analog level trigger is similar to an analog edge trigger. With both trigger types, you specify the edge—rising or falling—and the trigger level. With an analog edge trigger, you are interested in the ...

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, ...

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