Measurement Computing Corporation
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Norton, Massachusetts 02766
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Page 1: ...USB 234 Analog and Digital I O User s Guide Document Revision 3 October 2017 Copyright 2017...
Page 2: ...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 Corporation...
Page 3: ...Calibrating the hardware 9 Chapter 3 Functional Details 10 Analog input acquisition modes 10 Software paced mode 10 Hardware paced mode 10 External components 11 Screw terminals 11 USB connector 13 LE...
Page 4: ...er requirements 25 Power output 25 USB specifications 25 Environmental 26 Mechanical 26 Screw terminal connector 26 Screw terminal pinout 27 Differential mode pinout 27 Single ended mode pinout 27 Dec...
Page 5: ...ging your hardware or losing your data bold text Bold text is used for the names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manu...
Page 6: ...ccur when the USB 234 is connected through USB 1 1 ports or hubs Device features The USB 234 provides the following features Eight single ended SE or four differential DIFF 16 bit analog inputs 100 kS...
Page 7: ...USB 234 User s Guide Introducing the USB 234 7 Functional block diagram Device functions are illustrated in the block diagram shown here Figure 1 USB 234 functional block diagram...
Page 8: ...aq com Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com For international customers contact your...
Page 9: ...blinks If the LED turns off the device is either not fully connected or is in suspend mode If the LED blinks the device has encountered an error Wait 10 seconds to allow the device to attempt to reco...
Page 10: ...mode You can acquire data from up to eight channels in hardware paced mode The analog data is continuously acquired and converted to digital values until you stop the scan Data is transferred in block...
Page 11: ...nals provide the following connections refer to Figure 4 and Figure 5 for pinout diagrams Eight single ended four differential analog inputs CH0H CH0L to CH3H CH3L Two analog outputs AOUT0 and AOUT1 D...
Page 12: ...USB 234 User s Guide Functional Details 12 Figure 4 USB 234 differential pinout...
Page 13: ...in suspend mode On not blinking Device is connected and functioning normally Blinking Device has encountered an error 1 Wait 10 seconds to allow the device to attempt to recover from the error 2 If t...
Page 14: ...FO The DAQ device can perform both single and multiple analog to digital conversions of a fixed or infinite number of samples A first in first out FIFO buffer holds data during AI acquisitions to ensu...
Page 15: ...V Figure 7 Analog input exceeding 10 V returning clipped results Multichannel scanning The USB 234 can scan multiple channels at high rates and digitize the signals accurately However you should consi...
Page 16: ...signal to the 10 V range and ensures the driving capability for the external load DAC 0 and DAC 1 The digital to analog converters DAC convert the digital signals into low level analog signals AO FIFO...
Page 17: ...arate command to the hardware to initiate each DAQ conversion Software paced generations are also referred to as immediate or static operations They are typically used for writing a single value out s...
Page 18: ...ing is not liable for any damage resulting from such signal connections Power on states At system startup and reset the USB 234 sets all DIO lines to high impedance inputs The device does not drive th...
Page 19: ...re 11 VO power source circuitry The main blocks featured in the VO power source circuitry are as follows 5 V Source Regulated 5 V supply 5 V Protection Circuit for overvoltage over current and short c...
Page 20: ...vice is first connected to the USB connector or when the device is in suspend mode Ground The analog ground AGND terminals provide a common ground for all analog channels The digital ground DND termin...
Page 21: ...USB 234 User s Guide Functional Details 21 Mechanical drawings Figure 13 Circuit board top and housing dimensions...
Page 22: ...100 kS s Number of channels 8 single ended or 4 differential software selectable Input voltage range 10 V Working voltage 10 V Overvoltage protection Power on 30 V max Power off 20 V max Input impedan...
Page 23: ...full scale 32 mV INL 4 LSB DNL 16 bits no missing codes Power on state 0 V Startup glitch 7 V for 10 s Timebase The following specifications apply to hardware paced analog input and analog output sam...
Page 24: ...put Table 6 Digital output specifications Parameter Condition Specification Output low voltage 4 mA 0 7 V max 1 mA 0 2 V max Output high voltage 4 mA 2 1 V min 1 mA 2 8 V min 3 6 V max Maximum output...
Page 25: ...The USB 234 does not work on a bus powered hub Note 3 The maximum power draw from all output terminals should be kept under 0 9 W to avoid overloading the USB port Power output Table 10 External volta...
Page 26: ...ical Table 13 Mechanical specifications Parameter Conditions Specification Dimensions L W H With screw terminal connector plugs 93 2 86 2 23 6 mm 3 67 3 40 0 93 in Without screw terminals 75 4 86 2 23...
Page 27: ...14 AOUT0 Analog output 0 30 GND Digital ground 15 AOUT1 Analog output 1 31 VO User voltage output 16 AGND Analog ground 32 GND Digital ground Single ended mode pinout Do not connect to terminal block...
Page 28: ...2002 Radiated Electromagnetic Field immunity IEC 61000 4 4 2004 Electric Fast Transient Burst Immunity IEC 61000 4 5 2001 Surge Immunity IEC 61000 4 6 2007 Radio Frequency Common Mode Immunity IEC 610...
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...
