Measurement Computing USB-1208FS-Plus User Manual Download

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USB-1208FS-Plus

Analog and Digital I/O

Document Revision 4

November 2014
© Copyright 2014

User's Guide

Summary of Contents for USB-1208FS-Plus

Page 2: ...ed in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporat...

Page 3: ...g the hardware 7 Calibrating the hardware 8 Chapter 3 Functional Details 9 Analog input acquisition modes 9 Software paced 9 Hardware paced 9 External components 10 USB connector 10 LED 10 Screw termi...

Page 4: ...us User s Guide 4 Counter 25 Memory 25 Microcontroller 25 Power 25 General 26 Environmental 26 Mechanical 26 Signal connector 26 Differential mode pinout 27 Single ended mode pinout 27 Declaration of...

Page 5: ...e names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find...

Page 6: ...16 digital I O channels that are independently selectable as input or output in two 8 bit ports 32 bit event counter input for counting TTL pulses External digital trigger input Bidirectional termina...

Page 7: ...ing or damaged Installing the software Refer to the MCC DAQ Quick Start for instructions on installing the software on the MCC DAQ CD Refer to the device product page on the Measurement Computing webs...

Page 8: ...uter has lost communication with the device To restore communication disconnect the USB cable from the computer and then reconnect it This should restore communication and the LED should turn on Calib...

Page 9: ...lus can acquire data from up to eight channels using hardware paced mode The analog data is acquired and converted to digital values until you stop the scan Data is transferred in blocks of 32 samples...

Page 10: ...he device LED LED state Indication Steady green The device is connected to a computer or external USB hub Blinks continuously Data is being transferred Screw terminals The screw terminals provide the...

Page 11: ...S Plus User s Guide Functional Details 11 The single ended mode pinout is shown in Figure 3 Figure 3 Single ended mode pinout The differential mode pinout is shown in Figure 4 Figure 4 Differential mo...

Page 12: ...red for differential input mode the input signal is measured with respect to the low input and delivered through three wires Connect the wire carrying the signal to be measured to CH IN HI Connect the...

Page 13: ...sfy the 10 V to 20 V input requirement see Figure 6 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 Howev...

Page 14: ...lement Channel Range Gain 0 CH0 BIP10V 2 1 CH1 BIP20V 1 2 CH3 BIP4V 5 When a scan begins with the gain queue enabled the device reads the first element sets the appropriate channel number range and ga...

Page 15: ...ust remove the device housing to access the jumper on the circuit board Complete the following steps to set the jumper for pull up or pull down 1 Unplug the device from the computer 2 Turn the device...

Page 16: ...rsions on a second device and acquire data from 16 channels using one clock For more information about synchronized operations see page 19 Power output The VO connection draws power from the USB conne...

Page 17: ...s range Figure 11 Ideal ADC transfer function The 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 Figur...

Page 18: ...s 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 and neglecting the effect of offset the measurement would be w...

Page 19: ...ecting the device to a computer draws 100 mA of current from the USB 5V supply When running applications the current that can be drawn from all device connections analog digital SYNC and VO output loa...

Page 20: ...USB 1208FS Plus User s Guide Functional Details 20 Mechanical drawings Figure 15 Circuit board top and enclosure dimensions...

Page 21: ...0 V G 20 Software selectable Throughput Note 2 Software paced 250 S s typ PC dependent Hardware paced 0 014 S s to 50 kS s Channel gain queue Software selectable 8 elements in SE mode 4 elements in DI...

Page 22: ...766 10 V 0 2 20 9 766 29 766 5 V 0 2 10 9 766 19 766 4 V 0 2 8 9 766 17 766 2 5 V 0 2 5 9 766 14 766 2 V 0 2 4 9 766 13 766 1 25 V 0 2 2 5 9 766 12 266 1 V 0 2 2 9 766 11 766 Table 5 Accuracy componen...

Page 23: ...error producing a dead band digital input code region In this case changes in digital input code at values less than 0x040 may not produce a corresponding change in the output voltage The offset erro...

Page 24: ...lute min 0 V recommended min External clock input output Table 13 External clock I O specifications Parameter Condition Specification Terminal name SYNC Terminal type Bidirectional Direction software...

Page 25: ...Input high voltage limit 5 5 V absolute max Input low voltage threshold 1 42 V typ 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Memory Table 15 Memory specificati...

Page 26: ...ation Operating temperature range 0 C to 70 C Storage temperature range 40 C to 70 C Humidity 0 to 90 non condensing Mechanical Table 20 Mechanical specifications Parameter Specification Dimensions L...

Page 27: ...18 TRIG_IN Trigger input 38 Port B6 Port B bit 6 19 SYNC Synchronization I O 39 Port B7 Port B bit 7 20 CTR Counter input 40 GND Ground Single ended mode pinout Table 23 8 channel single ended mode pi...

Page 28: ...d immunity To maintain compliance to the standards of this declaration the following conditions must be met The host computer peripheral equipment power sources and expansion hardware must be CE compl...

Page 29: ...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...