Omega OM-USB-1208FS Synchronizing multiple units, Configuring for synchronous data acquisition

Page 21

OM-USB-1208FS User's Guide

Functional Details

Synchronizing multiple units

You can run up to two OM-USB-1208FS units on most computers.

You can connect the SYNC pin of two OM-USB-1208FS units together in a master/slave configuration and acquire data from the analog inputs of both devices using one clock. When the SYNC pin is configured as an output, the internal A/D pacer clock is sent to the screw terminal. You can use this signal as a clock input to a second USB by connecting it to the SYNC pin of the second USB.

When used as a clock input, the SYNC pin operates in one of two modes – Continuous or Gated.

In the default Continuous mode, a OM-USB-1208FS ignores the first clock pulse in order to ensure adequate setup time. Use this mode if the unit is being paced from a continuous clock source, such as a generator.

In the Gated mode, it is assumed that the clock signal will be held off for an adequate amount of time for setup to occur. No clock pulses are ignored. Use this mode if the OM-USB-1208FS is set up as a slave and the source of the external clock is another USB.

The SYNC pin (pin 19) is set for pacer output by default. To set it to input requires a software command (see Figure 13 below).

To synchronize a master OM-USB-1208FS with a slave OM-USB-1208FS and acquire data, follow the steps below.

1.Connect the SYNC pin of the master OM-USB-1208FS to the SYNC pin of the slave OM-USB-1208FS.

2.Run InstaCal.

3.From the PC Board List on the InstaCal main form, double-click on the OM-USB-1208FS you want to use as a slave. The Board Configuration dialog opens.

4.Select Gated from the Ext. Clock Type drop-down list.

5.Set the Universal Library EXTCLOCK option with cbAInScan()/AInScan for the slave OM-USB-1208FS to enable pacing from the master USB device.

This InstaCal option does not affect internally paced acquisition. It only affects scans that use the EXTCLOCK option.

An example of a master/slave configuration is shown below.

Figure 13. Configuring for synchronous data acquisition

When you are operating one OM-USB-1208FS, do not set the EXTCLOCK option unless you are using an external clock for A/D pacing.

21

Page 20 Page 22
Image 21
Page 20 Page 22
Contents Page Page Table of Contents OM-USB-1208FS Users Guide About this Users Guide Where to find more informationWhat you will learn from this user’s guide Conventions in this user’s guideChapter Introducing the OM-USB-1208FSSoftware features OM-USB-1208FS block diagramConnecting a OM-USB-1208FS to your computer is easy What comes with your OM-USB-1208FS shipment? Installing the OM-USB-1208FSUnpacking the OM-USB-1208FS HardwareInstalling the hardware Installing the softwareBe sure you are using the latest system software If the LED turns offContinuous scan mode Software paced modeFunctional Details Theory of operation analog input acquisition modesUSB connector Screw terminal wiringScrew terminal pins Main connector and pin out Single-ended configurationAnalog input terminals CH0 in CH7 Differential configuration Single-ended measurements using differential channelsChhi Chlo For more information on analog signal connections Power terminalsFor more information on digital signal connections Analog output terminals D/A OUT 0 and D/A OUTGround terminals Calibration terminalExternal trigger terminal Sync 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 outputExternal trigger External clock input/outputCounter Power Non-volatile memoryMicrocontroller Channel differential mode Main connector and pin outGeneral EnvironmentalChannel 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.
Top Page Image Contents