Omega OM-USB-1208FS manual Functional Details, Theory of operation analog input acquisition modes

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Chapter 3

Functional Details

Theory of operation - analog input acquisition modes

The OM-USB-1208FS can acquire analog input data in two different modes – software paced and continuous scan.

Maximum throughput is system-dependent

Maximum throughput may be lower in Windows operating systems that predate Windows XP.

Software paced mode

In software paced mode, you can acquire one analog sample at a time. You initiate the A/D conversion by calling a software command. The analog value is converted to digital and returned to the computer. You can repeat this procedure until you have the total number of samples that you want from one channel.

The maximum throughput sample rate in software paced mode is system-dependent.

Continuous scan mode

In continuous scan mode, you can acquire data from up to eight channels. The analog data is continuously acquired and converted to digital values until you stop the scan. Data is transferred in blocks of 31 samples from the OM-USB-1208FS to the memory buffer on your computer.

The maximum continuous scan rate of 50 kS/s is an aggregate rate. The total acquisition rate for all channels cannot exceed 50 kS/s. You can acquire data from one channel at 50 kS/s, two channels at 25 kS/s, and four channels at 12.5 kS/s. You can start a continuous scan with either a software command or with an external hardware trigger event.

External components

The OM-USB-1208FS has the following external components, as shown in Figure 3.

USB connector

LED

Screw terminal banks (2)

Figure 3. OM-USB-1208FS external components

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Contents Page Page Table of Contents OM-USB-1208FS Users Guide Conventions in this user’s guide Where to find more informationAbout this Users Guide What you will learn from this user’s guideChapter Introducing the OM-USB-1208FSSoftware features OM-USB-1208FS block diagramConnecting a OM-USB-1208FS to your computer is easy Hardware Installing the OM-USB-1208FSWhat comes with your OM-USB-1208FS shipment? Unpacking the OM-USB-1208FSIf the LED turns off Installing the softwareInstalling the hardware Be sure you are using the latest system softwareTheory of operation analog input acquisition modes Software paced modeContinuous scan mode Functional DetailsScrew terminal pins USB connectorScrew terminal wiring Analog input terminals CH0 in CH7 Main connector and pin outSingle-ended configuration Differential configuration Single-ended measurements using differential channelsChhi Chlo Analog output terminals D/A OUT 0 and D/A OUT Power terminalsFor more information on analog signal connections For more information on digital signal connectionsSync terminal Calibration terminalGround terminals External trigger terminalIdeal ADC transfer function AccuracyADC transfer function with offset error Error band plot OM-USB-1208FS channel gain queue featureSynchronizing multiple units Configuring for synchronous data acquisitionAnalog input SpecificationsRange Accuracy LSB Digital input/output Analog outputCounter External triggerExternal clock input/output Microcontroller PowerNon-volatile memory Environmental Main connector and pin outChannel differential mode GeneralChannel single-ended mode

OM-USB-1208FS specifications

The Omega OM-USB-1208FS is a high-performance data acquisition device designed for engineers and technicians who require accurate data logging and analysis in their experiments and applications. This versatile device is equipped with a range of features that make it an ideal choice for various measurement tasks across different industries.

One of the standout features of the OM-USB-1208FS is its ability to support a wide variety of input signals. The device is equipped with 16 analog input channels, which can be used for both voltage and thermocouple inputs, making it suitable for temperature monitoring and other signal measurements. The analog inputs provide a resolution of 16 bits, ensuring precise and reliable readings. Furthermore, it supports sampling rates of up to 100 kS/s, allowing for rapid data acquisition and real-time monitoring.

In addition to its analog capabilities, the OM-USB-1208FS has digital I/O lines that facilitate control and automation tasks. With 8 digital input/output channels, users can easily manage various external devices, sensors, or actuators, enhancing the overall functionality of the data acquisition system. This makes the device suitable for automation projects, as users can trigger actions based on acquired data.

Another distinguishing feature is the built-in USB interface, which offers a straightforward connection to computers without the need for additional power supplies or complex setups. The device is fully compatible with various operating systems, including Windows, making it easy to integrate into existing systems. The included software allows for easy data logging, visualization, and analysis, simplifying the process for users.

The OM-USB-1208FS is designed with durability and reliability in mind. Its compact and rugged construction ensures that it can withstand the rigors of fieldwork and laboratory use. Moreover, the device's comprehensive range of input types and robust performance specifications make it an asset for researchers across diverse fields, including environmental monitoring, manufacturing, and academic research.

In summary, the Omega OM-USB-1208FS is a powerful data acquisition solution that combines a multitude of features and technologies. With its high-resolution analog inputs, digital I/O capabilities, user-friendly USB interface, and reliable construction, it caters to the diverse needs of professionals seeking to capture and analyze data accurately and efficiently. Whether for academic research, industrial applications, or environmental monitoring, the OM-USB-1208FS stands out as a top choice in the data acquisition landscape.
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