USB-1208FS User's Guide - from Measurement Computing
Contents
1. Analog output Table 8 Analog output specifications Parameter Conditions Specification Resolution 12 bits 1 in 4096 Output range 0 V to 4 096 V 1 mV per LSB Number of channels 2 Throughput Note 4 Software paced 250 S s single channel typical PC dependent Single channel continuous scan 10 kS s Dual channel continuous scan 5 kS s simultaneous update Power on and reset voltage Initializes to 000h code Output drive Each D A OUT 15 mA Slew rate 0 8V microsecond us typ Note 4 Maximum throughput scanning to PC memory is machine dependent Table 9 Analog output accuracy all values are Range Accuracy LSB U V to 4 096 Y 4 0 typ 45 0 max Table 10 Analog output accuracy components all values are Range of FSR Gain Error at FS mV Offset mV Accuracy at FS Note 5 mV O V to 4 096 V 0 1 typ 0 9 max 4 0 typ 36 0 max 1 0 typ 9 0 max 4 0 typ 45 0 max Note 5 Negative offsets will result in a fixed zero scale error or dead band At the maximum offset of 9 mV any input code of less than 0x009 will not produce a response in the output Digital I O Table 11 Digital I O specifications Parameter Specification Digital type CMOS Number of I O 16 Port AO through A7 Port BO through B7 Configuration 2 banks of 8 Pull up pull down configuration All pins pulled up to 5V via 47 kQ resistors default2. With all outputs at their maximum output current you can calculate the total current requirement of the USB 1208FS USB 5 V as follows USB 1208FS 80 mA 16 DIO 2 5 mA ea 2 AO O 15 mA ea 150 mA For an application running on a PC or powered hub the maximum available excess current is 500 mA 150 mA 350 mA This number is the total maximum available current at the PC 5 V screw terminals Measurement Computing highly recommends that you figure in a safety factor of 20 below this maximum current loading for your applications A conservative safe user maximum in this case would be in the 350 380 mA range Since laptop computers typically allow up to 100 mA the USB 1208FS in a fully loaded configuration may be above that allowed by the computer In this case you must determine the per pin loading in the application to ensure that the maximum loading criteria is met The per pin loading is calculated by simply dividing the 5 V by the load impedance of the pin in question Accuracy The overall accuracy of any instrument is limited by the error components within the system Resolution is often used incorrectly to quantify the performance of a measurement product While 12 bits or 1 part in 4 096 does indicate what can be resolved it provides little insight into the quality of an absolute measurement Accuracy specifications describe the actual measurement achievable with a USB 1208FS There are three types of errors which a
3. All externally powered root port hubs desktop PCs provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 mA or 500 mA depending upon the manufacturer A laptop PC that is not connected to an external power adapter is an example of a battery powered root port hub Bus powered hubs receive power from a self powered or root port hub In this case the maximum current available from the USB 5 V is 100 mA The minimum USB 5 V voltage level can be as low as 4 1 V Note 8 This refers to the total amount of current that can be sourced from the USB 5 V analog outputs and digital outputs General Table 18 General specifications Parameter Specification Device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Environmental Table 19 Environmental specifications Parameter Specification 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 79 x 82 x 27 mm 3 10 x 3 20 x 1 05 in USB cable length 3 m 9 84 ft max User connection length 3 m 9 84 ft max 25 USB 1208FS User s Guide Specifications Screw terminal connector Table 21 Screw terminal specifications Parameter Specification Connector type Screw terminal Wire gauge
4. Port A channel 1 Port A channel 0 GND Port B7 Port B6 Port B5 Port B4 Port B3 Port B2 Port B1 Port BO GND PC 5V GND Port A7 Port A6 Port A5 Port A4 Port A3 Port A2 Port A1 Port AO GND Port B7 Port B6 Port B5 Port B4 Port B3 Port B2 Port B1 Port BO GND PC 5V GND Port A7 Port A6 Port A5 Port A4 Port A3 Port A2 Port A1 Port AO 40 39 38 37 36 35 33 32 31 30 29 28 27 26 25 24 23 22 21 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 DODDDDDDDDODDDDDDDDDO GOOD Signal connections Analog input N o CTR SYNC TRIG_IN GND CAL AGND D A OUT 1 D A OUT O AGND CH7 IN CH6 IN AGND CH5 IN CH4 IN AGND CH3 IN CH2 IN AGND CH1 IN CHO IN AAA NY 200 060 ity o GOGO Se NWF QG d G Figure 3 Single ended mode pinout N o CTR SYNC TRIG_IN GND CAL AGND D A OUT 1 D A OUT 0 AGND CH3 INLO CH3 IN HI AGND CH2 IN LO CH2 IN HI AGND CH1 IN LO CH1 IN HI AGND CHO INLO CHO IN HI b ok a chad b ok b MM W E QG J Q o DDDDDDODDDDDDDDWDDOOOO o d AM W E QG 0 Figure 4 Differential mode pinout Counter input Sync I O Trigger input Ground Calibration Analog ground AO channel 1 AO channel 0 Analog ground Al channel 7 Al channel 6 Analog ground Al channel 5 Al channel 4 Analog ground Al channel 3 Al channel 2 Analog ground Al channel 1 Al channel 0 Counter input Sync I O
5. Trigger input Ground Calibration Analog ground AO channel 1 AO channel O Analog ground Al channel 3 Al channel 3 Analog ground Al channel 2 Al channel 2 Analog ground Al channel 1 Al channel 1 Analog ground Al channel 0 Al channel 0 You can connect up to eight single ended analog input connections to CHO IN through CH7 IN or four differential connections to CHO IN HI LO through CH3 IN HI LO 11 USB 1208FS User s Guide Functional Details You can configure the analog input channels as eight single ended channels or four differential channels When configured for differential mode each analog input has 12 bit resolution When configured for single ended mode each analog input has 11 bit resolution due to restrictions imposed by the A D converter Single ended configuration When configured for single ended input mode eight analog channels are available The input signal is referenced to signal ground GND and delivered through two wires Connect the wire carrying the signal to be measured to CH IN Connect the second wire to AGND The input range for single ended mode is 10 V Single ended measurements using differential channels To perform a single ended measurement using differential channels connect the signal to the CH IN HI input and ground the associated CH IN LO input Differential configuration When the analog input channels are configured for differential input mode f
6. range 16 AWG to 30 AWG Differential mode pinout Table 22 4 channel differential mode pinout Pin Signal Name Pin Signal Name 1 CHO IN HI 21 Port AO 2 CHO IN LO 22 Port A1 3 AGND 23 Port A2 4 CH1 IN HI 24 Port A3 5 CH1 IN LO 25 Port A4 6 AGND 26 Port A5 7 CH2 IN HI 27 Port A6 8 CH2 IN LO 28 Port A7 9 AGND 29 GND 10 CH3 IN HI 30 PC 5V 11 CH3 IN LO 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 26 USB 1208FS User s Guide Specifications Single ended mode pinout Table 23 8 channel single ended mode pinout Pin Signal Name Pin Signal Name 1 CHO IN 21 Port AO 2 CH1 IN 22 Port A1 3 AGND 23 Port A2 4 CH2 IN 24 Port A3 5 CH3 IN 25 Port A4 6 AGND 26 Port A5 7 CH4 IN 27 Port A6 8 CH5 IN 28 Port A7 9 AGND 29 GND 10 CH6 IN 30 PC 5V 11 CH7 IN 31 GND 12 AGND 32 Port BO 13 D A OUT 0 33 Port B1 14 D A OUT 1 34 Port B2 15 AGND 35 Port B3 16 CAL 36 Port B4 17 GND 37 Port B5 18 TRIG_IN 38 Port B6 19 SYNC 39 Port B7 20 CTR 40 GND 27 CE Declaration of Conformity Manufacturer Measurement Computing Corporation Address 10 Commerce Way Suite 1008 Norton MA 02766 USA Category Electrical equipme
7. selected When the end of the channel list is detected the sequence returns to the first element in the list This sequence repeats until the specified number of samples is acquired Carefully match the gain to the expected voltage range on the associated channel or an over range condition may occur Although this condition does not damage the device it does produce a useless full scale reading and can introduce a long recovery time due to saturation of the input channel Analog output You can connect up to two analog output connections to D A OUT 0 and D A OUT 1 Each channel can be paced individually at rates up to 10 000 updates per second Both channels can be paced simultaneously using the same time base at 5 000 updates per channel The 0 V to 4 096 V output range provides a convenient 1 mV per LSB when setting the output voltage levels Digital I O The device has 16 digital bits that are configured as two 8 bit ports Port A and Port B You can connect up to eight digital I O lines to each port terminals Port AO to Port A7 and Port BO to Port B7 Each port is configurable as either input or output When configured for input you can use the digital 1 O terminals to detect the state of any TTL level input Refer to the schematic shown in Figure 8 T Port AO TT 5V GND Figure 8 Schematic showing switch detection by digital channel Port AO If you set the switch to the 5 V input DIOO reads TRUE 1 When set to GND Port AO
8. 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 Non volatile memory Table 15 Non volatile memory specifications EEPROM 1 024 bytes EEPROM Configuration Address Range Access Description 0x000 to 0x07F Reserved 128 bytes system data 0x080 to Ox1FF Read write 384 bytes cal data 0x200 to 0x3FF Read write 512 bytes user area Microcontroller Table 16 Microcontroller specifications Parameter Specification Type High performance 16 bit RISC microcontroller 24 USB 1208FS User s Guide Specifications Power Table 17 Power specifications Parameter Conditions Specification Supply current Note 6 80 mA 5V USB power available Note 7 Connected to self powered hub 4 5 V min 5 25 V max Connected to externally powered root port hub Connected to bus powered hub 4 1 V min 5 25 V max Output current Note 8 Connected to self powered hub 420 mA max Connected to externally powered root port hub Connected to bus powered hub 20 mA max Note 6 This is the total current requirement for the USB 1208FS which includes up to 10 mA for the status LED Note 7 Self powered hub refers to a USB hub with an external power supply Self powered hubs allow a connected USB device to draw up to 500 mA Root port hubs reside in the PC s USB host controller The USB port s on your PC are root port hubs
9. 4 Error band plot Synchronized operations You can run up to two USB 1208FS devices on most computers You can connect the SYNC pin of two devices together in a master slave configuration and acquire data from the analog inputs of both devices using one clock When the SYNC pin is configured as an output the internal A D pacer clock signal is sent to the screw terminal You can output the clock to the SYNC pin of a second device that is configured for A D pacer input 18 USB 1208FS User s Guide Functional Details Mechanical drawings E Baz E GND 0 100 CL 0 025 SQ PINS 0 0 100 CL 0 025 SQ PINS 40 el e o o e no s o o o O o e e S 3 2 58 8s So o o N 1 600 e o 1 225 0 750 0 80 0 050 0 000 0 069 0 050 1 385 0 750 1 225 o 1 600 s Maximum Component Height Top 0 545 Bottom 0 125 1 05 3 10 raser 2 20 Figure 15 Circuit board top and enclosure dimensions 19 Chapter 4 Specifications Analog input All specifications are subject to change without notice Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Table 1 Analog input specifications Parameter Conditions Specification A D converter type Successive approximation type Input voltage range for linear operation CHx to GND 10 volts V max single ended
10. Figure 5 Differential voltage example common mode voltage of 0 V If you increase the common mode voltage to 11 V the differential remains at 8 V Although the common mode voltage signal on each input now has a range of 7 V to 15 V both inputs still satisfy the 10 V to 20 V input requirement see Figure 6 12 USB 1208FS User s Guide Functional Details 15V Measured Signal cHHI 11V 8V Differential 8V cho TV 7V y 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 clipped see Figure 7 3V Measured Signal CHHI _7y 3V v 11V 8V Differential 7V CHLO 7V 11V Figure 7 Differential voltage example common mode voltage of 7 V 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 The 20 V range is the exception You cannot put 20 V on CHHI and 0 V on CHLO since this violates the input range criteria The table below shows some possible inputs and the expected results Sample inputs and di
11. Hardware revisions D and later may be changed to pull down using an internal user configurable jumper Previous revisions can be configured at the factory for pull down Input high voltage threshold 2 0 V min Input high voltage limit 5 5 V absolute max Input low voltage threshold 0 8 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Output high voltage 3 84 V min OH 6 0 mA Output low voltage 0 33 V max IOL 6 0 mA Power on and reset state Input 22 USB 1208FS User s Guide Specifications External trigger Table 12 External digital trigger specifications Parameter Conditions Specification Trigger source External digital TRIG_IN Trigger mode Software selectable Edge sensitive user configurable for CMOS compatible rising or falling edge Trigger latency 10 us max Trigger pulse width 1 us min Input type Schmitt trigger 47 kQ pull down to ground Schmitt trigger 1 01 V typ hysteresis 0 6 V min 1 5 V max Input high voltage 2 43 V typ threshold 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage 1 42 V typ threshold 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min External clock input output Table 13 External clock I O specifications Parameter Conditions Specification Pin name SY
12. NC Pin type Bidirectional Direction Output Outputs internal A D pacer clock Active on rising edge software selectable Input default Receives A D pacer clock from external source Active on rising edge Input clock rate 50 kHz maximum Clock pulse width Input mode 1 us min Output mode 5 us min Input type Schmitt trigger 47 kQ pull down to ground Schmitt trigger 1 01 V typ hysteresis 0 6 V min 1 5 V max Input high voltage 2 43 V typ threshold 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage 1 42 V typ threshold 1 0 V min 2 0 V max Input low voltage limit 0 5 V absolute min 0 V recommended min Output high voltage 4 4 V min IOH 50 uA 3 80 V min IOH 8 mA Output low voltage 0 1 V max IOL 50 uA 0 44 V max IOL 8 mA 23 USB 1208FS User s Guide Specifications Counter Table 14 Counter specifications Parameter Specification Pin name CTR Counter type Event counter Number of channels 1 Input type Schmitt trigger 47 kQ pull down to ground rising edge triggered Input source CTR screw terminal Resolution 32 bits Maximum input frequency 1 MHz High pulse width 500 ns min Low pulse width 500 ns min Schmitt trigger hysteresis 1 01 V typ 0 6 V min 1 5 V max Input high voltage threshold 2 43 V typ 1 9 V min 3 1V max Input high voltage limit 5 5 V absolute max Input low voltage threshold
13. SA in December 2008 Test records are outlined in Chomerics Test report EMI5215B 08 We hereby declare that the equipment specified conforms to the above Directives and Standards Oo LAL TU Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdag com www mccdag com
14. USB 1208FS Analog and Digital UO User s Guide Document Revision 10 Fa QU FA MEASUREMENT pe AWK R6 COMPUTING Copyright 2014 Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction 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 mission To provide data acquisition hardware and software that will save time and save money Simple installations minimize the time between setting up your system and actually making measurements We offer quick and simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Program Any Measurement Computing product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current list price I O boa
15. age of full scale Figure 13 shows the USB 1208FS transfer function with gain error Gain error is easily converted to voltage by multiplying the full scale FS input by the error 17 USB 1208FS User s Guide Functional Details The accuracy plots in Figure 13 are drawn for clarity and are not drawn to scale Input Voltage Gain error 0 2 or 20 mV Gain error 0 2 or 20 mV w lt g Ro FS Ideal E Actual Output Code 4095 Figure 13 ADC Transfer function with gain error For example the USB 1208FS exhibits a typical calibrated gain error of 0 2 on all ranges For the 10 V range this would yield 10 V x 40 002 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 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 Combining these two error sources in Figure 14 we have a plot of the error band of the USB 1208ES for the 10 V range This is a graphical version of the typical accuracy specification of the product The accuracy plots in Figure 14 are drawn for clarity and are not drawn to scale Input Voltage Ideal 9 77 mV 20 mV deal Ideal 9 77 mV 20 mV Output Code Ideal 9 77 mV 20 mV gt Ideal gt Ideal 9 77 mV 20 mV gt Figure 1
16. ce then carefully remove the top section of the case to expose the circuit board The user configurable jumpers are labeled DIO A and DIO B Figure 9 shows the location of the each jumper on the circuit board Figure 9 Pull up down jumper locations 5 Configure each jumper for pull up or pull down as shown in Figure 10 Use the jumper labeled DIO A to configure Port A and DIO B to configure Port B P UP N 2 P DN S Figure 10 Pull up down jumper configuration 6 Replace the top section of the housing and fasten it to the bottom section with the three screws Counter input The CTR terminal is a 32 bit event counter that can accept frequency inputs up to 1 MHz The internal counter increments when the TTL levels transition from low to high Trigger input The TRIG_IN terminal is an external digital trigger input that you can configure for either rising or falling edge SYNC UO The SYNC terminal is a bidirectional I O signal that can be configured as an input default or an output Configure as an external clock input to externally source the A D conversions The SYNC terminal supports TTL level input signals of up to 50 kHz 15 USB 1208FS User s Guide Functional Details Configure as an output to pace conversions on a second USB 1208FS device and acquire data from 16 channels For more information synchronized operations see page 18 Calibration output The CAL terminal is an output used only to calibra
17. ct the USB 1208FS to your system 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 1208FS installs as a composite device with separate devices attached When you connect the USB 1208ES for the first time a Found New Hardware dialog opens as each device interface is detected This is normal After the device is installed its LED blinks and then remains on This indicates that communication is established between the USB 1208FS and your computer USB 1208FS User s Guide Installing the USB 1208FS If the LED turns off If communication is lost between the device and the computer the LED turns off To restore communication disconnect the USB cable from the computer and then reconnect it This should restore communication and the LED should turn on Chapter 3 Functional Details Analog input acquisition modes The USB 1208FS can acquire analog input data in either software paced or hardware paced mode Software paced The USB 1208FS acquires data one analog sample at a time using software paced mode You initiate the A D conversion by calling a software command The analog value is converted to digital and returned to the computer You can repeat this procedure until you have the total number of samples that you want The maximum sample rate in software paced mode is system dependent Hardware paced The USB 1208FS can acquire data from up to eig
18. e dependent Note 3 The AD7870 converter only returns 11 bits 0 to 2047 codes in single ended mode 20 USB 1208FS User s Guide Specifications Table 2 Accuracy differential mode Range Accuracy LSB 20 V 5 1 10 V 6 1 5 V 8 1 4 V 9 1 2 5 V 12 1 2 V 14 1 1 25 V 20 1 1 V 24 1 Table 3 Accuracy single ended mode Range Accuracy LSB 10 V 4 0 Table 4 Accuracy components differential mode All values are Range of Reading Gain Error at full scale FS Offset mV Accuracy at FS mV millivolts mV 20 V 0 2 40 9 766 49 766 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 components single ended mode All values are Range of Reading Gain Error at FS mV Offset mV Accuracy at FS mV 10 V 0 2 20 19 531 39 531 Table 6 Noise performance differential mode Range Typical counts Least significant bitroot mean square LSBrms 20 V 2 0 30 10 V 2 0 30 5 V 3 0 45 4 V 3 0 45 2 5 V 4 0 61 2 V 5 0 76 1 25 V 7 1 06 1 V 8 1 21 Table 7 Noise performance single ended mode Range Typical Counts LSBrms 10 V 2 0 30 21 USB 1208FS User s Guide Specifications
19. ffect the accuracy of a measurement system offset gain nonlinearity The primary error sources in the USB 1208FS are offset and gain Nonlinearity is small in the USB 1208FS and is not significant as an error source with respect to offset and gain 16 USB 1208FS User s Guide Functional Details Figure 11 shows an ideal error free USB 1208FS transfer function The typical calibrated accuracy of the USB 1208FS is range dependent as explained in the Specifications chapter on page 20 We use a 10 V range here as an example of what you can expect when performing a measurement in this range Input Voltage K Output Code 2048 4095 Figure 11 Ideal ADC transfer function The USB 1208FS 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 Figure 12 shows the USB 1208FS transfer function with an offset error The typical offset error specification on the 10 V range is 9 77 mV Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis The accuracy plots in Figure 12 are drawn for clarity and are not drawn to scale Input Voltage Ideal 2 Offset 9 77 mV Output Code Actual i Figure 12 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 percent
20. fferential results CHHI CHLO Result 20 V OV Invalid 15 V 5 V Invalid 10 V OV 10 V 10 V 10 V 20 V OV 10 V 10V OV 20 V 20 V 10 V 10 V 20 V 10 V OV 10 V 15 V 5 V 20 V 20 V 0 20 V For more information on analog signal connections For more information on single ended and differential inputs refer to the Guide to DAQ Signal Connections this document is available on our web site at www mccdaq com signals 13 USB 1208FS User s Guide Functional Details Channel Gain queue The channel gain queue feature allows you to set up a scan sequence with a unique per channel gain setting and channel sequence The gain settings are stored in a channel gain queue list that is written to local memory on the device The channel gain queue list can contain up to 16 elements in any order The channel gain queue list can contain up to 16 elements in any order An example of a four element list is shown in the table below Sample channel gain queue list Element Channel Range 0 CHO BIP10V 1 CHO BIPSV 2 CH7 BIP10V 3 CH2 BIPIV When a scan begins with the gain queue enabled the USB 1208FS reads the first element sets the appropriate channel number and range 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
21. hanical Screw terminal Ud dde 26 DIA Moa 26 Single nded mode pili A a eeu pce eerie tiecitlae 21 Declaration Of Conio V a r aere ea e eeaeee r aeree RKS a pae anaana Enni YX SS TREZ 28 Preface About this User s Guide What you will learn from this user s guide This user s guide describes the Measurement Computing USB 1208FS data acquisition device and lists device specifications Conventions in this user s guide For more information Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading Caution Shaded caution statements present information to help you avoid injuring yourself and others damaging 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 manuals and help topic titles and to emphasize a word or phrase Where to find more information Additional information about the USB 1208FS is available on our website at www mccdag com You can also contact Measurement Computing Corporation by phone fax or email with specific questions Knowledgebase kb mccdag 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 Chapter 1 Introducing the USB 1208FS The USB 1208FS Plus is a
22. ht 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 31 samples from the USB 1208FS 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 The total sample rate for all channels cannot exceed 50 kS s The following table lists the sample rate when scanning from one to eight channels Maximum per channel sample rate channels scanned Sample rate kS s 1 50 25 16 70 12 50 10 8 30 7 14 6 25 INIIAI ELA You can start a hardware paced scan with a software command Optionally hardware paced scans can be delayed by an external hardware trigger event USB 1208FS User s Guide Functional Details External components The external components screw terminal banks LED and USB connector are shown in Figure 2 1 Screw terminal pins 21to40 3 Screw terminal pins 1 to 20 2 LED 4 USB connector Figure 2 External components USB connector The USB connector provides 5V power and communication No external power supply is required LED The LED indicates the communication status it cannot be disabled LED states are listed in the table below LED behavior LED Illumination Indication Steady green The USB 1208FS is connected to a computer or external USB hub B
23. links continuously Data is being transferred Screw terminals The screw terminals provide the following connections Eight analog inputs CHO IN to CH7 IN Two analog outputs D A OUT 0 to D A OUT 1 16 digital I O connections PortA0 to Port A7 and Port BO to Port B7 One external trigger input TRIG_IN One external event counter input CTR One SYNC I O for external clocking and multi unit synchronization SYNC One calibration output CAL One power output PC 5 V Five analog ground connections AGND and four digital ground connections GND One ground connection GND Use 16 AWG to 30 AWG wire when making connections to the screw terminals The single ended mode pinout is shown in Figure 3 10 USB 1208FS User s Guide Functional Details Ground Port B channel 7 Port B channel 6 Port B channel 5 Port B channel 4 Port B channel 3 Port B channel 2 Port B channel 1 Port B channel 0 Ground Power output Ground Port A channel 7 Port A channel 6 Port A channel 5 Port A channel 4 Port A channel 3 Port A channel 2 Port A channel 1 Port A channel 0 The differential mode pinout is shown in Figure 4 Ground Port B channel 7 Port B channel 6 Port B channel 5 Port B channel 4 Port B channel 3 Port B channel 2 Port B channel 1 Port B channel 0 Ground Power output Ground Port A channel 7 Port A channel 6 Port A channel 5 Port A channel 4 Port A channel 3 Port A channel 2
24. lock Gia gram a2 ve docs sevece ck e e a a e Eaa ARE lotus dosasticvecbtveecvanes 6 Chapter 2 Installing the US B 1 208ES a aeee ar re ea cousecenterssbezenccesccuntesess exasteanpeescoenes 7 What comes with your shipment Hardware Software Documentation Unpacking AE R ells ib ice 7 IFE 7 Installing the Nard TTT 7 Chapter 3 Functional S CTI naar 9 Analog input acquisition MOMES ccs isce csessccsssdsseceoesseessnsdey shee E EE Esp EEEE EE EEEE E EEE E RER EEr ETIE rE eS Ree 9 Software paca a Hardware paced External COMPONER 10 USB connector Signal CONNECHON Sari la 11 ALO MU ti A e asi Analog output Digital VO eiii as Counter input Trigger input SYNC TO osiers Calibration output Ground 0 Power output PCCULACY Sas Ba stapes cadens AA TT Synchronized Opera nui aid 18 Mechanical drawings ociosas cirio iria o aiii edades 19 Chapter 4 S 99 AAA e E nono deste ence de sents E ae aa o SEa a eaaa aaea 20 Analog Mpu eer ar e rea E E A EE in iii 20 ANAL Ad E dei 22 Digital TO caida 22 External HB nd 23 External clock input output ssena a RTE e nono nono E EE E e anne ne E N conc EEI 23 Cote aE EE E decida 24 Non volatile Memory ist o ES AEE E SEEE EEE E ET aA 24 Microcontroller ss esseere pesei til e e S E OAS Re OEN E o a BAe ER E Eneo SI ES SeS oe BEE Sae EEES SCST 24 USB 1208FS User s Guide POWELL teca H 25 AA a a baled baile o TO Ed ad 25 Environmental i 25 Mec
25. mode Input common mode voltage range for CHx to GND 10 V min 20 V max linear operation differential mode Absolute maximum input voltage CHx to GND 28 V max Input impedance 122 kQ Input current Note 1 Vin 10 V 70 uA typ Vin 0 V 12 uA typ Vin 10 V 94 uA typ Number of channels Software selectable 8 single ended 4 differential Input ranges single ended mode 10 V G 2 Input ranges differential mode Software selectable 20 V G 1 10 V G 2 5 V G 4 4 V G 5 2 5 V G 8 2 0 V G 10 1 25 V G 16 1 0 V G 20 Throughput Note 2 Software paced 250 S s typ PC dependent Hardware paced 50 kS s Channel gain queue Up to 16 elements Software configurable channel range and gain Resolution Note 3 Differential 12 bits no missing codes Single ended 11 bits CAL accuracy CAL 2 5 V 36 25 mV max Integral linearity error 1 LSB typ Differential linearity error 0 5 LSB typ Repeatability 1 LSB typ CAL current Source 5 mA max Sink 20 uA min 100 uA typ Trigger source Software selectable External digital TRIG_IN Pacer source Software selectable m Internal m External SYNC rising edge triggered m Programmed IO Note 1 Input current is a function of applied voltage on the analog input channels For a given input voltage Vin the input leakage is approximately equal to 8 181 V 12 pA Note 2 Maximum throughput scanning to PC memory is machin
26. n analog input and digital I O data acquisition device that provides the following features Eight analog input channels that are software selectable for either eight 11 bit single ended inputs or four 12 bit differential inputs Two 12 bit analog output channels 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 terminal for external clocking or multi unit synchronization Screw terminals for field wiring connections The USB 1208FS is powered by the 5 volt USB supply from your computer No external power is required All I O connections are made to the device screw terminals USB 1208FS block diagram USB 1208FS functions are illustrated in the block diagram shown here USB G 1 2 4 5 8 10 16 20 Full speed USB 2 0 Compliant Interface DIO 16 2 a Analog Input 2 SL Porta A Z Ep SPI 8 single ended 3 S gt 11 bit channels 3 E E 3 or 8 Port 4 differential o E A 12 bit channels 8 lt 3 E 3 2 USB 3 Z Microcontroller 3 TRIG_IN 2 channels 2 12 bit caL CAL 32 bit Event Counter 1 1 channel Figure 1 USB 1208FS functional block diagram Chapter 2 Installing the USB 1208FS What comes with your shipment The following items are shipped with the USB 1208ES Hardware USB 1208FS USB cable Software MCC DAQ Software CD D
27. nt for measurement control and laboratory use Measurement Computing Corporation declares under sole responsibility that the product USB 1208ES to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents EC EMC Directive 2004 108 EC General Requirements EN 61326 1 2006 IEC 61326 1 2005 Emissions EN 55011 2007 CISPR 11 2003 Radiated emissions Group 1 Class A EN 55011 2007 CISPR 11 2003 Conducted emissions Group 1 Class A Immunity EN 61326 1 2006 Table 3 IEC 61000 4 2 2001 Electrostatic Discharge immunity IEC 61000 4 3 2002 Radiated Electromagnetic Field 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 J O cables must be less than 3 meters 9 75 feet in length The host computer must be properly grounded Equipment must be operated in a controlled electromagnetic environment as defined by Standards EN 61326 1 2006 or IEC 61326 1 2005 Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in May 2004 Test records are outlined in Chomerics Test Report EMI3876 04 Further testing was conducted by Chomerics Test Services Woburn MA 01801 U
28. ocumentation MCC DAQ Quick Start Guide The Quick Start Guide booklet provides an overview of the MCC DAQ software you received with the device and includes information about installing the software Please read this booklet completely before installing any software or hardware Unpacking As with any electronic device take care while handling to avoid damage from static electricity Before removing the USB 1208FS from its packaging ground yourself using a wrist strap or touch either the computer chassis or other grounded object to eliminate any stored static charge If the device is damaged notify Measurement Computing Corporation immediately by phone fax or email Knowledgebase kb mccdag com Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupportOmccdag com For international customers contact your local distributor Refer to the International Distributors section on our web site at www mccdaq com International Installing the software Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD This booklet is available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before installing the device run Windows Update to update your operating system with the latest HID and USB drivers To conne
29. our analog channels are available In differential mode the input signal is measured with respect to the low input The input signal is 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 A low noise precision programmable gain amplifier PGA is available on differential channels to provide gains of up to 20 and a dynamic range of up to 12 bits Differential mode input voltage ranges are 20 V 10 V ES V 4 V 2 5 V 2 0 V 1 25 V and 1 0 V 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 analog input pair must remain within the selected voltage range The input common mode voltage signal of the differential channel must be in the 10 V to 20 V range in order to yield a useful result For example you input a 4 V pp sine wave to CHHI and apply the same sine wave 180 out of phase to CHLO The common mode voltage is O V The differential input voltage swings from 4 V 4V 8V to 4 V 4 V 8V Both inputs satisfy the 10 V to 20 V input range requirement and the differential voltage is suited for the 10 V input range see Figure 5 4V Measured Signal CHHI ov AV 8V Differential 8V 4V CHLO AV
30. rds face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned within 30 days of purchase for a full refund of the price paid for the product being returned If you are not satisfied or chose the wrong product by mistake you do not have to 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 from the use of its products even if Measurement Computing Corporation has been notified in advance of the possibility of such damages Trademark and Copyright Information Measurement Computing Corporation InstaCal Universal Library and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Refer to the Copyrights amp Trademarks section on mecdaq com legal for more information about Measurement Computing trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies 2014 Measurement Computing Corpora
31. reads FALSE 0 For more information on digital signal connections For more information on digital signal connections and digital I O techniques refer to the Guide to DAQ Signal Connections available on our web site at www mccdagq com signals Pull up down configuration Boards designed with hardware revision D and later have user configurable internal jumpers to configure the digital bits for pull up default or pull down The hardware revision is listed with the part number on the bottom of the device for example P N 193331D 14 USB 1208FS User s Guide Functional Details If the p n of your board is earlier than hardware revision D the default configuration is pull up To configure for pull down the board must be modified at the factory If your board has user configurable jumpers complete the following steps to set the pull up down configuration 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 1208FS from its housing ground yourself using a wrist strap or touch the computer chassis or other grounded object to eliminate any stored static charge Remove the three screws from the bottom of the device using a 1 Philips head screwdriver 4 Hold both the top and bottom sections together turn the device over and rest it on the surfa
32. te the device Calibration is software controlled via InstaCal Ground The analog ground AGND terminals provide a common ground for all analog channels The ground GND connections provide a common ground for the digital trigger counter sync and power terminals Power output The PC 5V terminal is a 5 volt output that is supplied by the computer You can use this terminal to supply power to external devices or circuitry Caution The PC 5V terminal is an output Do not connect to an external power supply or you may damage the USB 1208FS and possibly the computer The maximum total output current that can be drawn from all USB 1208FS connections power analog and digital outputs is 420 mA This maximum applies to most personal computers and self powered USB hubs Bus powered hubs and notebook computers may limit the maximum available output current to 100 mA Just connecting the USB 1208FS to your computer draws 80 mA of current from the USB 5 V supply Once you start running applications with the USB 1208FS each DIO bit can draw up to 2 5 mA and each analog output can draw 15 mA The maximum amount of 5 V current available for experimental use over and above that required by the USB 1208ES is the difference between the total current requirement of the 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
33. tion All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted 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 does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support devices systems are devices or systems that a are intended for surgical implantation into the body or b support or sustain life and whose failure to perform can be reasonably expected to result in injury Measurement Computing Corporation products are not designed with the components required and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people HM USB 1208FS docx Table of Contents Preface About this User s GUIA irene 5 What you will learn from this user s guide sss eee eee 5 Conventions in this user s guides iseenesesse esien eo neuer nono neon nero nono neon eran enn enn nacen nena iE Si 5 Where to find more informations nineteen ias KER cR deS ek KOR 2 dai ON ROET ONCE RTE KISS E SRTR ENO 3 Chapter 1 Introducing the USB 1208FS s csscssseesseeeeseesseeesneeseeesenessaescaeeeae sean dinadaan aaaeaii aNu 6 USB 1208ES b
Download Pdf Manuals
Related Search