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Related Manuals for Measurement Computing USB-1208LS
Summary of Contents for Measurement Computing USB-1208LS
- Page 2 USB-1208LS USB-based Analog and Digital I/O Module User's Guide Document Revision 2, May, 2006 © Copyright , Measurement Computing Corporation 2006...
- Page 3 Measurement Computing. Thank you for choosing a Measurement Computing product—and congratulations! You own the finest, and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support. It’s the embodiment of our two missions: To offer the highest-quality, computer-based data acquisition, control, and GPIB hardware and software available—at...
- Page 4 Information furnished by Measurement Computing Corporation is believed to be accurate and reliable. However, no responsibility is assumed by Measurement Computing Corporation neither for its use; nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation.
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Page 5: Table Of Contents
Chapter 1 Introducing the USB-1208LS......................1-1 USB-1208LS block diagram........................... 1-2 Software features ............................1-2 Connecting a USB-1208LS to your computer is easy ..................1-3 Chapter 2 Installing the USB-1208LS........................ 2-1 What comes with your USB-1208LS shipment? .................... 2-1 Hardware ..................................2-1 Additional documentation.............................. - Page 6 USB-1208LS User's Guide Mechanical ..............................4-4 Main connector and pin out ..........................4-4 4-channel differential mode ............................4-5 8-channel single-ended mode............................4-5...
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Page 7: 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 USB-1208LS 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 site, and to technical support resources that can also help you get the most out of the USB-1208LS. -
Page 8: Introducing The Usb-1208Ls
Chapter 1 Introducing the USB-1208LS This user's guide contains all of the information you need to connect the USB-1208LS to your computer and to the signals you want to measure. ® ® The USB-1208LS is a USB 1.1 low-speed device supported under popular Microsoft... -
Page 9: Usb-1208Ls Block Diagram
Figure 1-2. USB-1208LS Functional block diagram Software features For information on the features of InstaCal and the other software included with your USB-1208LS, refer to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf... -
Page 10: Connecting A Usb-1208Ls To Your Computer Is Easy
HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for your USB-1208LS. No third-party device driver is required. The USB-1208LS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to configure. -
Page 11: Installing The Usb-1208Ls
As with any electronic device, you should take care while handling to avoid damage from static electricity. Before removing the USB-1208LS from its packaging, ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge. -
Page 12: Installing The Software
To connect the USB-1208LS to your system, turn your computer on, and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer. The USB cable provides power and communication to the USB-1208LS. -
Page 13: Functional Details
Burst scan mode In burst scan mode, you can acquire data using the full capacity of the USB-1208LS 4 k sample FIFO. You can initiate a single acquisition sequence of up to 4096 samples channels by either a software command or an external hardware trigger. -
Page 14: External Components
The voltage supplied through the USB connector is system-dependent, and may be less than 5V. No external power supply is required. The LED on the front of the housing indicates the communication status of the USB-1208LS. It uses up to 5 mA of current and cannot be disabled. -
Page 15: Screw Terminal Wiring
Functional Details Screw terminal wiring The USB-1208LS has two rows of screw terminals—one row on the top edge of the housing, and one row on the bottom edge. Each row has 20 connections. Pin numbers are identified in Fi gure 3-2 Figure 3-2. -
Page 16: Analog Input Terminals (Ch0 In - Ch7 In)
USB-1208LS User's Guide Functional Details 4-channel differential mode pin out 8-channel single-ended mode pin out Analog input terminals (CH0 IN - CH7 IN) You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 (CH0 IN through CH7 IN). - Page 17 USB-1208LS User's Guide Functional Details Figure 3-3. Single-ended measurement connection The following image shows the single-ended measurement data acquired by TracerDAQ. Figure 3-4. TracerDAQ plot of single-ended measurement data Single-ended measurements using differential channels To perform a single-ended measurement using differential channels, connect the signal to "CHn IN HI" input, and ground the associated "CHn IN LO"...
- Page 18 USB-1208LS User's Guide Functional Details In differential mode, the following two requirements must be met for linear operation: Any analog input must remain in the −10V to +20V range with respect to ground at all times. The maximum differential voltage on any given analog input pair must remain within the selected voltage range.
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Page 19: Digital I/O Terminals (Port A0 To A7, And Port B0 To B7)
USB-1208LS User's Guide Functional Details Since the analog inputs are restricted to a −10 V to +20 V signal swing with respect to ground, all ranges except ±20V can realize a linear output for any differential signal with zero common mode voltage and full scale signal inputs. -
Page 20: Power Terminals
1208LS USB +5 V as follows: (USB-1208LS @ 20 mA) + (16 DIO @ 2.5 mA ea) + (2 AO @ 30 mA ea ) = 120 mA For an application running on a PC or powered hub, the maximum available excess current is 500 mA−120 mA = 380 mA. -
Page 21: Calibration Terminal
USB-1208LS User's Guide Functional Details Calibration terminal connection (pin 16) is an output you should use only to calibrate the USB-1208LS. Refer to the pinout diagrams on page 3-4 for the location of this pin. Calibration of the USB-1208LS is software-controlled via InstaCal. - Page 22 2048 4095 Figure 3-10. Ideal ADC transfer function The USB-1208LS offset error is measured at mid-scale. Ideally, a zero volt input should produce an output code of 2048. Any deviation from this is an offset error. Fi gure 3-11 shows the USB-1208LS transfer function with an offset error.
- Page 23 Figure 3-12. ADC Transfer function with gain error For example, the USB-1208LS exhibits a typical calibrated gain error of ±0.2% on all ranges. For the ±10 V range, this would yield 10 V × ±0.002 = ±20 mV. This means that at full scale, neglecting the effect of offset for the moment, the measurement would be within 20 mV of the actual value.
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Page 24: Usb-1208Ls Channel Gain Queue Feature
The channel gain queue feature removes the restriction of using an ascending channel sequence at a fixed gain. This feature creates a channel list which is written to local memory on the USB-1208LS. The channel list is made up of a channel number and range setting. An example of a four-element list is shown in Table 3-3 Table 3-3. -
Page 25: Specifications
Chapter 4 Specifications Typical for 25°C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Parameter Conditions Specification A/D converter type Successive approximation type Input voltage range for linear operation, CHx to GND ±10 V max single-ended mode Input common-mode voltage range for CHx to GND... -
Page 26: Analog Output
USB-1208LS User's Guide Specifications Table 1. Accuracy, differential mode Range Accuracy (LSB) ±20 V ±10 V ±5 V ±4 V ±2.5 V 12.1 ±2 V 14.1 ±1.25 V 20.1 ±1 V 24.1 Table 2. Accuracy, single-ended mode Range Accuracy (LSB) ±10 V... -
Page 27: Digital Input/Output
USB-1208LS User's Guide Specifications Digital input/output Digital type 82C55 Number of I/O 16 (Port A0 through A7, Port B0 through B7 Configuration 2 banks of 8 Pull up/pull-down configuration All pins pulled up to Vs via 47K resistors (default). Positions available for pull down to ground. -
Page 28: Power
450 mA min, 500 mA max Connected to Bus-Powered Hub 50 mA min, 100 mA max This is the total current requirement for the USB-1208LS which includes up to 5mA for the Note 5: status LED. Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB Note 6: hubs and hosts without their own power supply. -
Page 29: Channel Differential Mode
USB-1208LS User's Guide Specifications 4-channel differential mode Signal Name Signal Name CH0 IN HI Port A0 CH0 IN LO Port A1 Port A2 CH1 IN HI Port A3 CH1 IN LO Port A4 Port A5 CH2 IN HI Port A6... - Page 30 Norton, MA 02766 Category: Electrical equipment for measurement, control and laboratory use. Measurement Computing Corporation declares under sole responsibility that the product USB-1208LS to which this declaration relates is in conformity with the relevant provisions of the following standards or other...
- Page 31 Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton, Massachusetts 02766 (508) 946-5100 Fax: (508) 946-9500 E-mail: info@mccdaq.com www.mccdaq.com...
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