Page 3 - Table of Contents
3 Table of Contents Preface About this User's Guide ....................................................................................................................... 5 What you will learn from this user’s guide ......................................................................................
Page 5 - About this User's Guide; What you will learn from this user’s guide; For more information on ...; Shaded caution; bold; Bold; OK; Where to find more information; Documents
5 Preface About this User's Guide What you will learn from this user’s guide This user’s guide explains how to install, configure, and use the OM-USB-1208FS so that you get the most out of its USB data acquisition features. This user’s guide also refers you to related documents available on our web ...
Page 6 - Chapter 1; Windows
6 Chapter 1 Introducing the OM-USB-1208FS This user's guide contains all of the information you need to connect the OM-USB-1208FS to your computer and to the signals you want to measure. The OM-USB-1208FS is a USB 2.0 full-speed device supported under popular Microsoft ® Windows ® operating systems....
Page 7 - Software features; For information on the features of
OM-USB-1208FS User's Guide Introducing the OM-USB-1208FS 7 OM-USB-1208FS block diagram OM-USB-1208FS functions are illustrated in the block diagram shown here. Figure 2. OM-USB-1208FS functional block diagram Software features For information on the features of Insta Cal and the other software inclu...
Page 8 - Connecting a OM-USB-1208FS to your computer is easy; Installing a data acquisition device has never been easier.
OM-USB-1208FS User's Guide Introducing the OM-USB-1208FS 8 Connecting a OM-USB-1208FS to your computer is easy Installing a data acquisition device has never been easier. The OM-USB-1208FS relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class drivers ship with every c...
Page 9 - Series Data Acquisition Software User’s Guide
9 Chapter 2 Installing the OM-USB-1208FS What comes with your OM-USB-1208FS shipment? As you unpack your OM-USB-1208FS, verify that the following components are included. Hardware OM-USB-1208FS (shown with cable) USB cable (2 meter length) Additional documentation In addition to this hardware us...
Page 10 - Installing the software; Software; Installing the hardware; Be sure you are using the latest system software; Found New Hardware; any
OM-USB-1208FS User's Guide Installing the OM-USB-1208FS 10 Installing the software Refer to the OMB-DAQ-2416 Series and OM-USB Series Data Acquisition Software User’s Guide for instructions on installing the software on the OMB-DAQ-2416 Series and OM-USB Series Data Acquisition Software CD. This boo...
Page 11 - Chapter 3; Functional Details; Theory of operation - analog input acquisition modes; Maximum throughput is system-dependent; Software paced mode; External components; USB connector
11 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 p...
Page 12 - Screw terminal wiring; Screw terminal
OM-USB-1208FS User's Guide Functional Details 12 USB connector The USB connector is on the right side of the OM-USB-1208FS. This connector provides +5 V power and communication. The voltage supplied through the USB connector is system-dependent, and may be less than 5 V. No external power supply is ...
Page 13 - Main connector and pin out; Single-ended configuration
OM-USB-1208FS User's Guide Functional Details 13 Screw terminal – pins 21-40 The screw terminals on the bottom edge of the (pins 21 to 40) provide the following connections: 16 digital I/O connections ( PortA0 to Port A7 , and Port B0 to Port B7 ) One power connection ( PC+5 V ) Three ground c...
Page 14 - Single-ended measurements using differential channels; The input signal is delivered through three wires:
OM-USB-1208FS User's Guide Functional Details 14 Single-ended measurements using differential channels To perform a single-ended measurement using differential channels, connect the signal to CHn IN HI, and ground the associated CHn IN LO input. Differential configuration When all of the analog inpu...
Page 15 - except; CHHI
OM-USB-1208FS User's Guide Functional Details 15 Figure 6. Differential voltage example: common mode voltage of 11 V If you decrease the common-mode voltage to -7 V, the differential stays at ±8 V. However, the solution now violates the input range condition of -10 V to +20 V. The voltage on each an...
Page 16 - For more information on analog signal connections; Port A0; For more information on digital signal connections; Power terminals
OM-USB-1208FS User's Guide Functional Details 16 For more information on analog signal connections For more information on single-ended and differential inputs, refer to the the OMB-DAQ-2416 Series and OM- USB Series General Guide to Signal Connections (available on our web site at www.omega.com/man...
Page 17 - allowed; Calibration terminal; Insta; Ground terminals
OM-USB-1208FS User's Guide Functional Details 17 USB (based on the application), and the allowed current draw of the PC platform (500 mA for desktop PCs and self-powered hubs, or 100 mA for bus-powered hubs and notebook computers). With all outputs at their maximum output current, you can calculate ...
Page 18 - Accuracy; offset
OM-USB-1208FS User's Guide Functional Details 18 Accuracy The overall accuracy of any instrument is limited by the error components within the system. Quite often, resolution is incorrectly used to quantify the performance of a measurement product. While "12-bits" or "1 part in 4096"...
Page 19 - FS
OM-USB-1208FS User's Guide Functional Details 19 Figure 10. ADC transfer function with offset error Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a percentage of full-scale. Figure 11 shows the OM-USB-1208FS transfer function with gain err...
Page 20 - OM-USB-1208FS channel gain queue feature; Element
OM-USB-1208FS User's Guide Functional Details 20 The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale. Figure 12. Error band plot OM-USB-1208FS channel gain queue feature The OM-USB-1208FS's channel gain queue feature allows you to set up a scan sequence with a unique per...
Page 21 - Synchronizing multiple units; PC Board List
OM-USB-1208FS User's Guide Functional Details 21 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 on...
Page 22 - Chapter 4; Specifications; All specifications are subject to change without notice.; italic text; are guaranteed by design.; Analog input; Parameter
22 Chapter 4 Specifications All specifications are subject to change without notice. Typical for 25°C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Table 1. Analog input specifications Parameter Conditions Specification A/D converter type Successive...
Page 24 - Analog output; Digital input/output
OM-USB-1208FS User's Guide Specifications 24 Table 7. Noise performance, single-ended mode Range Typical Counts LSB rms ±10 V 2 0.30 Analog output Table 8. Analog output specifications Parameter Conditions Specification Resolution 12-bits, 1 in 4096 Output range 0 – 4.096 V, 1 mV per LSB. Number of ...
Page 25 - External trigger; External clock input/output; Counter
OM-USB-1208FS User's Guide Specifications 25 External trigger Table 12. Digital trigger specifications Parameter Conditions Specification Trigger source (Note 6) External Digital TRIG_IN Trigger mode Software selectable Edge sensitive: user configurable for CMOS compatible rising or falling edge. Tr...
Page 26 - Microcontroller; Power; Root port hubs
OM-USB-1208FS User's Guide Specifications 26 Input low voltage 1.0 V max, –0.5 V absolute min Note 8: CTR is a Schmitt trigger input protected with a 1.5K Ω series resistor. Non-volatile memory Table 15. Non-volatile memory specifications EEPROM 1,024 bytes EEPROM Configuration Address Range Access ...
Page 27 - General; Environmental; Mechanical; -channel differential mode
OM-USB-1208FS User's Guide Specifications 27 General Table 18. General specifications Parameter Conditions Specification Device type USB 2.0 full speed Device compatibility USB 1.1, USB 2.0 Environmental Table 19. Environmental specifications Operating temperature range 0 to 70 °C Storage temperatur...
