Measurement Computing USB-1408FS-Plus User Manual Download

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USB-1408FS-Plus

Analog and Digital I/O

Document Revision 4

November 2014
© Copyright 2014

User's Guide

Summary of Contents for USB-1408FS-Plus

Page 2: ...keep it These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising f...

Page 3: ...alling 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 terminals 10 Signal connections 12 Analog input 12 Analog output 14 Digital I O 15 Counter input 16 Trigger input 16 SYNC I O 16 Power output 16 Ground 16 Accuracy 16 Synchronized operations 19 Power ...

Page 4: ...User s Guide 4 Counter 25 Memory 25 Microcontroller 25 Power 25 General 26 Environmental 26 Mechanical 26 Screw terminal connector 26 Differential mode pinout 27 Single ended mode pinout 27 Declaration of Conformity 28 ...

Page 5: ...he 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 more information Additional information about USB 1408FS Plus hardware is available on our website at www mccdaq com You can also contact Measurement Computing Corporation with specific questions Kn...

Page 6: ...nput for counting TTL pulses External digital trigger input Bidirectional terminal for external clocking or multi unit synchronization Screw terminals for field wiring connections The device is powered by the 5 V USB supply from the computer No external power is required The USB 1408FS Plus is compatible with both USB 1 1 and USB 2 0 ports The speed of the device may be limited when using a USB 1 ...

Page 7: ...sing 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 website for information about the included and optional software supported by the USB 1408FS Plus Install the software before you install your device The driver needed to run the USB 1408FS Plus is insta...

Page 8: ...puter 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 Calibrating the hardware The Measurement Computing Manufacturing Test department performs the initial factory calibration Return the device to Measurement Computing Corporation when calibration is require...

Page 9: ... The USB 1408FS Plus 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 minimum from the device to the memory buffer on your computer The A D converter is paced by either an internal or external clock source The maximum sample rate is an aggregate rate T...

Page 10: ...f the 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 following connections Eight analog input connections CH0 IN to CH7 IN CH0 IN HI LO through CH3 IN HI LO Two analog output connections D A OUT 0 to D A OUT 1 16 digital I O connections PortA0 to Por...

Page 11: ...FS 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 mode pinout ...

Page 12: ...al 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 wire carrying the reference signal to CH IN LO Connect the third wire to GND The differential mode pinout is shown in Figure 4 on page 11 Note To perform a single ended measurement using differential channels connect ...

Page 13: ...isfy 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 However the solution now violates the input range condition of 10 V to 20 V The voltage on each analog input now swings from 3 V to 11 V Voltages between 10 V and 3 V are resolved but those below 10 V are...

Page 14: ...Channel Range Gain 0 CH0 BIP20V 1 1 CH1 BIP5V 4 2 CH2 BIP10V 2 3 CH3 BIP2V 10 When a scan begins with the gain queue enabled the device reads the first element sets the appropriate channel number range and gain and then acquires a sample The properties of the next element are then retrieved and another sample is acquired This sequence continues until all elements in the gain queue have been select...

Page 15: ...must remove the device housing to access the jumpers 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 over and rest the top of the housing on a flat stable surface Caution The discharge of static electricity can damage some electronic components Before removing the USB 1408FS from its housing ground...

Page 16: ...e 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 connector on the computer Caution The VO terminal is an output Do not connect to an external power supply or you may damage the USB 1408FS Plus and possibly the computer Ground The analog ground AGND terminals provide a common gr...

Page 17: ...is 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 8192 Any deviation from this is an offset error Figure 12 shows an example of a transfer function with a 2 44 mV offset error Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis The ac...

Page 18: ...n example of a transfer function with a calibrated gain error of 0 02 or 2 mV This means that at full scale neglecting the effect of offset for the moment the measurement would be within 2 mV of the actual value Note that gain error is expressed as a ratio Values near FS are more affected from an absolute voltage standpoint than are values near mid scale which see little or no voltage error Combin...

Page 19: ...necting 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 loading is 500 mA The maximum output current that is available at the VO power output terminal is 100 mA With all outputs at their maximum output current the USB 1408FS Plus in a fully loaded configurat...

Page 20: ...USB 1408FS Plus User s Guide Functional Details 20 Mechanical drawings Figure 15 Circuit board top and enclosure dimensions ...

Page 21: ... s typ PC dependent Hardware paced 0 014 S s to 48 kS s Channel gain queue Software selectable 8 elements in SE mode 4 elements in DIFF mode One gain element per channel Elements must be unique and listed in ascending order Resolution Note 3 Differential 14 bits no missing codes Single ended 13 bits Integral linearity error 2 LSB typ Differential linearity error 0 5 LSB typ Absolute accuracy long ...

Page 22: ...t significant bitroot mean square LSBrms 20 V 8 1 21 10 V 8 1 21 5 V 9 1 36 4 V 10 1 51 2 5 V 12 1 81 2 V 14 2 12 1 25 V 18 2 72 1 V 22 3 33 Table 5 Noise performance single ended mode Range Typical Counts LSBrms 10 V 8 0 1 21 Analog output Table 6 Analog output specifications Parameter Condition Specification Resolution 12 bits 1 in 4 096 Output range 0 V to 5 0 V Number of channels 2 Throughput ...

Page 23: ...at code 0x040 Digital input output Table 9 Digital I O specifications Parameter Specification Digital type CMOS Number of I O 16 Port A0 through A7 Port B0 through B7 Configuration 2 banks of 8 Port B is high current drive Pull up pull down configuration All pins pulled up to 5V via 47 kΩ resistors default Change to pull down using internal user configurable jumpers Input high voltage threshold 2 ...

Page 24: ...ed min External clock input output Table 11 External clock I O specifications Parameter Condition Specification Terminal name SYNC Terminal type Bidirectional Direction software selectable Output Outputs the internal A D pacer clock Active on rising edge Input default Receives A D pacer clock from external source Active on rising edge Input clock rate 48 kHz max Clock pulse width Input mode 1 µs m...

Page 25: ...t 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 13 Memory specifications Parameter Specification Non volatile EEPROM 2 048 bytes 768 bytes calibration 256 bytes user 1 024 bytes DAQFlex Microcontroller Table 14 Microcontroller specifications Parameter Specification Type High performance 16 b...

Page 26: ...on Operating temperature range 0 C to 70 C Storage temperature range 40 C to 70 C Humidity 0 to 90 non condensing Mechanical Table 18 Mechanical specifications Parameter Specification Dimensions L W H 79 82 27 mm 3 10 3 20 1 05 in USB cable length 3 m 9 84 ft max User connection length 3 m 9 84 ft max Screw terminal connector Table 19 Screw terminal specifications Parameter Specification Connector...

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 21 8 channel single ended mode pinout Pin Signal name Pin description Pin Signal name Pin description 1 CH0 IN Analog input 0 21 Port A0 Port A bit 0 2 CH1 IN Analog input 1 22 Port A1 Port A bit 1 3 AGND Analog ground 23 Port A2 Po...

Page 28: ...ld 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 compliant All I O cables must be shielded with the shields connected to ground I O cables must be less than 3 meters 9 75 feet in length The host computer must be properly grounded The host computer must ...

Page 29: ...ion 10 Commerce Way Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com NI Hungary Kft H 4031 Debrecen Hátar út 1 A Hungary Phone 36 52 515400 Fax 36 52 515414 http hungary ni com debrecen ...

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