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Measurement Specialties USB-1616HS

1. USB 1616HS 2 User s Guide Specifications Table 17 USB 1616HS 2 screw terminal pin out differential connections Analog common Aw Digital common Dw Analog output 0 AOO FIRSTPORTA Bit 0 Analog output 1 AO1 FIRSTPORTA Bit 1 A1 NC FIRSTPORTA Bit 2 A2 NC s FIRSTPORTA Bit 3 A3 Analog common Aw amp FIRSTPORTA Bit 4 A4 Analog Out GAL Reserved for self calibration FIRSTPORTA Bits as 019 1 VO Signal ground Sw FIRSTPORTA Bit 6 A6 Digital common Dw FIRSTPORTA Bit 7 A7 TTL trigger TRG Digital common Dw Output scan clock I O DPR Timer 0 TO Input scan clock I O APR Timer 1 T1 Analog common Aw Digital common Dw CH 0 HI 0H FIRSTPORTB Bit 0 BO CH 0 LO 8L FIRSTPORTB Bit 1 B1 Analog common Aw FIRSTPORTB Bit 2 B2 CH 1 HI 1H T FIRSTPORTB Bit 3 B3 CH 1 LO 9L FIRSTPORTB Bit 4 B4 i Analog I Dig Ctr I O MEM Analog common Av FIRSTPORTB Bit 5 B5 9 7 CH 2 HI 2H FIRSTPORTB Bit 6 B6 CH 2 LO 10L FIRSTPORTB Bit 7 B7 Analog common Aw Digital common Dw CH 3 HI 3H Counter 0 CTO CH 3 LO 11L Counter 1 CT1 Analog common Aw Digital common Dw CH 4 HI 4H FIRSTPORTC Bit 0 CH 4 LO 12L FIRSTPORTC Bit 1 C1 Analog common Aw T FIRSTPORTC Bit 2 C2 CH 5 HI 5H p FIRSTPORTC Bit 3 C3 CH 5LO 13L FIRSTPORTC Bit 4 C4 D Analog In Analog common Aw FIRSTPORTC Bit 5 C5 Dig C
2. 34 USB 1616HS 2 User s Guide Functional Details Both timer outputs can also be updated during an acquisition as the result of setpoints applied to analog or digital inputs Using multiple USB 1616HS 2s per PC USB 1616HS 2 features can be replicated up to four times as up to four devices can be connected to a single host PC The serial number on each USB 1616HS 2 distinguishes one from another You can operate multiple USB 1616HS 2 boards synchronously To do this set up one USB 1616HS 2 with the pacer terminal you want to use APR or DPR configured for output Set up the USB 1616HS 2 boards you want to synchronize to this board with the pacer screw terminal you want to use APR or DPR configured for input Wire the pacer terminal configured for output to each of the pacer input terminals that you want to synchronize To operate two or more USB 1616HS 2s synchronously Use coax or twisted pair wire to connect the output signal to the input s Connect Digital Common of each USB 1616HS 2 to one of the twisted pairs or to the shield of the coax Detection setpoint overview You can program each as one of the following Single point referenced Above below or equal to the defined setpoint Window dual point referenced Inside or outside the window Window dual point referenced hysteresis mode Outside the window high forces one output designated Output 2 outside the window low forces another outpu
3. 65535 At this point you can update FIRSTPORTC or DACs Limit Limit Logical output Figure 30 Channel 1 in totalizing counter mode inside the window setpoint Detection Detection setpoint details Controlling analog digital and timer outputs You can program each setpoint with an 8 bit digital output byte and corresponding 8 bit mask byte When the setpoint criteria is met the FIRSTPORTC digital output port can be updated with the given byte and mask Alternately you can program each setpoint with a 16 bit DAC update value and any one of the two DAC outputs can be updated in real time Any setpoint can also be programmed with a timer update value In hysteresis mode each setpoint has two forced update values Each update value can drive one DAC one timer or the FIRSTPORTC digital output port In hysteresis mode the outputs do not change when the input values are inside the window There is one update value that gets applied when the input values are less than the window and a different update value that gets applied when the input values are greater than the window Update on True and False uses two update values The update values can drive DACs FIRSTPORTC or timer outputs FIRSTPORTC digital outputs can be updated immediately upon setpoint detection This is not the case for analog outputs as these incur another 3 us delay This is due to the shifting of the digital data out to the D A converter which ta
4. Main connector specifications Main connectors Six banks of removable screw terminal blocks Expansion connector 25 pin DSUB female DSUB2SF Compatible cable for the 25 pin expansion connector CA 96A Compatible accessory product for the 25 pin expansion AI EXP48 expansion board with screw terminals can connect connector to the USB 1616HS 2 directly or with the CA 96A cable 12 USB 1616HS 2 User s Guide Installing the USB 1616HS 2 Screw terminal pin outs USB 1616HS 2 screw terminal pin out single ended connections Analog common A v Digital common Dv Analog output 0 AOO FIRSTPORTA Bit 0 A0 Analog output 1 AO1 FIRSTPORTA Bit 1 A1 NC FIRSTPORTA Bit 2 A2 NC FIRSTPORTA Bit 3 Analog common Av FIRSTPORTA Bit 4 A4 Analog Out SAL Reserved Tor self calibration MEIRSTPORTA Bit 5 oe mU Signal ground S v FIRSTPORTA Bit 6 A6 Digital common Dv FIRSTPORTA Bit 7 A7 TTL trigger TRG Digital common Dv Output scan clock I O DPR Timer 0 TO Input scan clock I O APR Timer 1 T1 Analog common A v Digital common Dv CH 0 0H FIRSTPORTB Bit 0 BO CH 8 8L FIRSTPORTB Bit 1 B1 Analog common A v FIRSTPORTB Bit 2 B2 CH 1 1H rs FIRSTPORTB Bit 3
5. 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 di Angle brackets that enclose numbers separated by a colon signify a range of numbers such as those assigned to registers bit settings etc bold text Bold text is used for the names of objects on the screen such as buttons text boxes and check boxes For example 1 Insert the disk or CD and click the OK button italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase For example The nstaCal installation procedure is explained in the Quick Start Guide Never touch the exposed pins or circuit connections on the board Where to find more information The following electronic documents provide information that can help you get the most out of your USB 1616HS 2 MCC s Specifications USB 1616HS 2 the PDF version of the Specifications chapter in this guide is available on our web site at www mccdaq com pdfs USB 1616HS 2 pdf MCC s Quick Start Guide is available on our web site at www mccdaq com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal Connections is available on our web site at www mcecdag com signals signals pdf MCC s Universal Library User s Guide is available
6. TracerDAQ Universal Library Harsh Environment Warranty Measurement Computing Corporation and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Windows Microsoft and Visual Studio are either trademarks or registered trademarks of Microsoft Corporation LabVIEW is a trademark of National Instruments CompactFlash is a registered trademark of SanDisk Corporation XBee and XBee PRO are trademarks of MaxStream Inc All other trademarks are the property of their respective owners 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 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 Corp
7. Explanation Single channel analog hardware trigger Any analog input channel can be software programmed as the analog trigger channel including any of the analog expansion channels Input signal range 10 V to 10 V maximum Trigger level Programmable 12 bit resolution Latency 350 ns typical 1 3 us max Accuracy 0 5 of reading 2 mV offset maximum Noise 2 mV RMS typical Single channel analog software trigger Any analog input channel including any of the analog expansion channels can be selected as the software trigger channel If the trigger channel involves a calculation such as temperature then the driver automatically compensates for the delay required to obtain the reading resulting in a maximum latency of one scan period Input signal range Anywhere within range of the trigger channel Trigger level Programmable 16 bit resolution Latency One scan period maximum External single channel digital trigger A separate digital input is provided for digital triggering Input signal range 15 V to 15 V maximum Trigger level TTL level sensitive Minimum pulse width 50 ns high 50 ns low Latency One scan period maximum Digital pattern 8 bit or 16 bit pattern triggering on any of the digital ports Programmable for trigger on equal triggering not equal above or below a value Individual bits can be masked for don t care condition Latency One sc
8. You can program the trigger level the rising or falling edge to trigger on and hysteresis A note on the hardware analog level trigger and comparator change state When analog input voltage starts near the trigger level and you are performing a rising or falling hardware analog level trigger the analog level comparator may have already tripped before the sweep was enabled If this is the case the circuit waits for the comparator to change state However since the comparator has already changed state the circuit does not see the transition To resolve this problem do the following Setthe analog level trigger to the threshold you want Apply an analog input signal that is more than 2 5 of the full scale range away from the desired threshold This ensures that the comparator is in the proper state at the beginning of the acquisition Bring the analog input signal toward the desired threshold When the input signal is at the threshold some tolerance the sweep will be triggered Before re arming the trigger again move the analog input signal to a level that is more than 2 5 of the full scale range away from the desired threshold For example if you are using the 2 V full scale range gain 5 and you want to trigger at 1 V on the rising edge set the analog input voltage to a start value that is less than 0 9 V 1 V 2 V 2 2 5 Digital triggering A separate digital trigger input line is provided T
9. and 3 Each channel in the scan group can have one detection setpoint There can be no more than 16 total setpoints total applied to channels within a scan group Detection setpoints act on 16 bit data only Since the USB 1616HS 2 has 32 bit counters data is returned 16 bits at a time The lower word the higher word or both lower and higher words can be part of the scan group Each counter input channel can have one detection setpoint for the counter s lower 16 bit value and one detection setpoint for the counter s higher 16 bit value 36 USB 1616HS 2 User s Guide Functional Details Setpoint configuration You program all setpoints as part of the pre acquisition setup similar to setting up an external trigger Since each setpoint acts on 16 bit data each has two 16 bit compare values a high limit imit A and a low limit limit B These limits define the setpoint window There are several possible conditions criteria and effectively three update modes as explained in the following configuration summary Set high limit You can set the 16 bit high limit limit A when configuring the USB 1616HS 2 through software Set low limit You can set the 16 bit low limit B when configuring the USB 1616HS 2 through software Set criteria Inside window Signal is below 16 bit high limit and above 16 bit low limit Outside window Signal is above 16 bit high limit or below 16 bit low limit Greater than value Sig
10. 2500 mW nominal at 5 V 500 mA USB specifications Table 12 USB specifications USB device type USB 2 0 high speed mode 480 Mbps if available recommended otherwise USB1 1 full speed mode 12 Mbps Device compatibility USB 2 0 recommended or USB 1 1 Environmental Table 13 Environmental specifications Operating temperature range 30 C to 70 C Storage temperature range 40 C to 80 C Relative humidity 0 to 95 non condensing Mechanical Table 14 Mechanical specifications Vibration MIL STD 810E category 1 and 10 Dimensions 269 mm W x 92 mm D x 45 mm 10 6 x 3 6 x 1 6 Weight 431 g 0 95 Ibs Signal I O connectors and pin out Table 15 Screw connector specifications Connector type Screw terminal Wire gauge range 14 AWG to 30 AWG Expansion connector type 25 pin DSUB female Compatible expansion products AI EXP48 expansion module with screw terminals 50 USB 1616HS 2 User s Guide Specifications Table 16 USB 1616HS 2 screw terminal pin out single ended connections Analog common Aw Digital common Dw Analog output 0 AOO FIRSTPORTA Bit 0 Analog output 1 AO1
11. B3 CH 9 9L FIRSTPORTB Bit 4 B4 gt Anal g In Analog common Av FIRSTPORTB Bits Bs Dig Ctr VO CH 2 2H FIRSTPORTB Bit 6 B6 CH 10 10L FIRSTPORTB Bit 7 B7 Analog common Av Digital common Dv CH 3 3H Counter 0 CTO CH 11 11L Counter 1 CT1 Analog common Av Digital common D v CH 4 4H FIRSTPORTC Bit 0 CO CH 12 12L FIRSTPORTC Bit 1 C1 Analog common Av FIRSTPORTC Bit 2 C2 CH 5 5H z FIRSTPORTC Bit 3 C3 CH 13 13L FIRSTPORTC Bit 4 C4 Analog In Analog common e FIRSTPORTC Bit 5 z Dig Ctr CH 6 6H FIRSTPORTC Bit 6 C6 CH 14 14L FIRSTPORTC Bit 7 C7 Analog common Av Digital common Dv CH 7 7H Counter 2 CT2 CH 15 15L Counter 3 CT3 13 USB 1616HS 2 User s Guide Installing the USB 1616HS 2 USB 1616HS 2 screw terminal pin out differential connections Analog common Digital common Dw Analog output 0 AOO0 FIRSTPORTA Bit 0 Analog output 1 AO1 FIRSTPORTA Bit 1 A1 NC FIRSTPORTA Bit 2 A2 NC FIRSTPORTA Bit 3 Analog common Aw FIRSTPORTA Bit 4 A4 Analog Out CAL Reserved for self calibration MEIRSTPORTA Bit 5 any Signal ground S v FIRSTPORTA Bit 6 A6 Digital common Dw FIRSTPORTA Bit 7 A7 TTL tr
12. D As in several different modes Internal output scan clock The onboard programmable clock can generate updates ranging from 1 Hz to 1 MHz External output scan clock A user supplied external output scan clock at the DPR screw terminal External input scan clock A user supplied external input scan clock at APR can pace both the D A and the analog input Internal input scan clock The internal ADC scan clock Example Analog channel scanning of voltage inputs and streaming analog outputs The example shown in Figure 11 adds two DACs and a 16 bit digital pattern output to the example presented in Figure 7 on page 19 Start of scan Start of scan Start of scan Start of scan 0 1 3 4 6 7 0 1 3 4 6 7 0 1 3 4 6 7 0 1 3 4 6 7 Ie le Scan gt period DACO DACO DACO DACI pact pact D16 D16 D16 DACx x Sy en NN Figure 11 Analog channel scan of voltage inputs and streaming analog outputs example This example updates all DACs and the 16 bits of digital I O These updates happen at the same time as the output scan clock All DACs and the 16 bits of pattern digital output are updated at the beginning of each scan 23 USB 1616HS 2 User s Guide Functional Details Due to the time it takes to shift the digital data out to the DACs plus the actual settling time of the digital to analog conversion the DACs actually take up to 4 us after the start of scan to settle on
13. channels and analog outputs You can operate all analog I O digital I O and counter timer I O synchronously Software features For information on the features of nstaCal and the other software included with your USB 1616HS 2 refer to the Quick Start Guide that shipped with your device The Quick Start Guide 1s also available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Check www mccdaq com download htm for the latest software version Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred 8 Chapter 2 Installing the USB 1616HS 2 What comes with your USB 1616HS 2 shipment As you unpack your USB 1616HS 2 verify that the following components are included Hardware USB 1616HS 2 USB cable 2 meter length TR 2U power supply and CA 1 line cord AC to DC conversion power supply and cord plugs into the external power connector of the USB 1616HS 2 European customers Contact Measurement Computing to order 261 line cord for your region Optional components Expansion devices and cables and that are compatible with the USB 1616HS 2 and must be ordered separately If you ordered any of the following products with your device they should be included with your shipment USB 1616HS 2 User s Guide Installing the USB 1616HS 2 AI EXP48 Analog input expansion module adds up to 24 differentia
14. of Scan ju 4 C2 C2 C2 C1 C1 C1 C1 co co co co 12 5 11 13 15 12 5 111315 12 5 111 13 115 12 5 11 13 15 tus le Scan Period Figure 9 Analog and digital scanning once per scan mode example 20 USB 1616HS 2 User s Guide Functional Details The counter channels may return only the lower 16 bits of count value if that is sufficient for the application They could also return the full 32 bit result if necessary Similarly the digital input channel could be the full 24 bits if desired or only eight bits if that is sufficient If the three counter channels are all returning 32 bit values and the digital input channel is returning a 16 bit value then 13 samples are being returned to the PC every scan period with each sample being 16 bits The 32 bit counter channels are divided into two 16 bit samples one for the low word and the other for the high word If the maximum scan frequency is 166 666 Hz then the data bandwidth streaming into the PC is 2 167 MS s Some slower PCs may have a problem with data bandwidths greater than 6 MS s The USB 1616HS 2 has an onboard MS buffer for acquired data Example Sampling digital inputs for every analog sample in a scan group The scan is programmed pre acquisition and is made up of six analog channels Ch0 Ch2 Ch5 Ch11 Ch13 Ch15 and four digital channels 16 bits of digital input three counter inputs Each of the analog channels can h
15. power for your USB 1616HS 2 application The USB 1616HS 2 requires 3000 mW by itself and 3400 mW when connected to the AI EXP48 By USB2 standards USB 2 0 ports are required to provide at least 2500 mW Connect the USB cable to the USB 1616HS 2 USB connector and to a USB port on your computer USB2 0 port is recommended connecting to a USB1 1 port results in lower performance When you connect the USB 1616HS 2 for the first time a Found New Hardware message opens as the USB 1616HS 2 is detected When the message closes the installation is complete The power LED bottom LED blinks during device detection and initialization and then remains solid 1f properly detected If not check if the USB 1616HS 2 has sufficient power When the board is first powered on there is usually a momentary delay before the power LED begins to blink or come on solid Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB 1616HS 2 or you may lose data and or your ability to communicate with the USB 1616HS ps USB 1616HS 2 User s Guide Installing the USB 1616HS 2 Configuring the hardware All hardware configuration options on the USB 1616HS 2 are software controlled You can select some of the configuration options using nstaCal such as the analog input configuration 16 single ended or 8 differential channels and the edge used for pacing when using an external clock When measuring from thermo
16. quadrature encoders with a 16 bit counter low or a 32 bit counter high counter 20 MHz frequency and X1 X2 and X4 count modes With only phase A and phase B signals two channels are supported with phase A phase B and index Z signals 1 channel is supported Each input can be 31 USB 1616HS 2 User s Guide Functional Details debounced from 500 ns to 25 5 ms total of 16 selections to eliminate extraneous noise or switch induced transients Encoder input signals must be within 5V to 10V and the switching threshold is TTL 1 3V Quadrature encoders generally have three outputs A B and Z The A and B signals are pulse trains driven by an optical sensor inside the encoder As the encoder shaft rotates a laminated optical shield rotates inside the encoder The shield has three concentric circular patterns of alternating opaque and transparent windows through which an LED shines There is one LED and one phototransistor for each of the concentric circular patterns One phototransistor produces the A signal another phototransistor produces the B signal and the last phototransistor produces the Z signal The concentric pattern for A has 512 window pairs or 1024 4096 etc When using a counter for a trigger source use a pre trigger with a value of at least 1 Since all counters start at zero with the initial scan there is no valid reference in regard to rising or falling edge Setting a pre trigger to 1 or more ensures that a val
17. the updated value The data for the DACs and pattern digital output comes from a PC based buffer The data is streamed across the USB2 bus to the USB 1616HS 2 You can update the DACs and pattern digital output with the output scan clock either internally generated or externally applied In this scenario the acquisition input scans are not synchronized to the analog outputs or pattern digital outputs You can also synchronize everything input scans DACS pattern digital outputs to one clock which is either internally generated or externally applied Digital I O Twenty four TTL level digital I O lines are included in each USB 1616HS 2 You can program digital I O in 8 bit groups as either inputs or outputs and scan them in several modes see Digital input scanning below You can access input ports asynchronously from the PC at any time including when a scanned acquisition is occurring Digital input scanning Digital input ports can be read asynchronously before during or after an analog input scan Digital input ports can be part of the scan group and scanned along with analog input channels Two synchronous modes are supported when digital inputs are scanned along with analog inputs Refer to Example 4 Sampling digital inputs for every analog sample in a scan group on page 13 for more information In both modes adding digital input scans has no affect on the analog scan rate limitations If no analog inputs are be
18. two analog outputs and digital pattern outputs at the same time Digital and counter inputs do not affect the overall A D rate because these inputs use no time slot in the scanning sequencer For example one analog input channel can be scanned at the full 1 MHz A D rate along with digital and counter input channels Each analog channel can have a different gain and counter and digital channels do not need additional scanning bandwidth as long as there is at least one analog channel in the scan group Digital input channel sampling is not done during the dead time of the scan period where no analog sampling is being done either USB 1616HS 2 User s Guide Functional Details Analog input The USB 1616HS 2 has a 16 bit 1 MHz A D coupled with 16 single ended or eight differential analog inputs Seven software programmable ranges provide inputs from 10 V to 100 mV full scale Analog input scanning The USB 1616HS 2 has several scanning modes to address various applications You can load the 512 location scan buffer with any combination of analog input channels All analog input channels in the scan buffer are measured sequentially at 1 us per channel by default For example in the fastest mode with ADC settling time set to 1 us a single analog channel can be scanned continuously at 1 MS s two analog channels can be scanned at 500 kS s each 16 analog input channels can be scanned at 62 5 kS s Settling time For most a
19. De Rete tpe m Example Analog channel scanning of voltage inputs and streaming analog outputs Digital VO D ede e deco ee e de ap et e DH e eor he eee eg Digital input scanning oer tete ne Digital outputs and pattern generation ssssssssseeseeeeenenenne enne eene teeth inneren innen eae E PE Hardware analog triggering Digital triggering Software based triggering Stop trigger modes ssssssss Pre triggering and post triggering modes sesssssssseseeeeeeeeee nennen ennt nennen nee ene Counter Inputs eee d TOR REI Te RUN RE USB 1616HS 2 User s Guide Tips for making high speed counter measurements gt 1 MHz Mapped channels Counter modes Debounce modes Encoder mode Timer Examples Timer outputs senad ioa eec bit en ao Gos ie bre eae Pr i Ford B eee qu ters dead Using multiple USB 1616HS 2s per PC sse nennen eren enne enne enne enne Detection setpoint overview Setpoint Using the setpoint status register Examples of control outputs Detection setpoint 115 FIR
20. FIRSTPORTA Bit 1 A1 NC FIRSTPORTA Bit 2 A2 NC FIRSTPORTA Bit 3 A3 Analog common Aw FIRSTPORTA Bit 4 A4 Analog Out SAL Reserved for self calibration FIRSTPORTA Bits as 019 1 VO Signal ground S FIRSTPORTA Bit 6 A6 Digital common Dw FIRSTPORTA Bit 7 A7 TTL trigger TRG Digital common Dw Output scan clock I O DPR Timer 0 TO Input scan clock I O APR Timer 1 T1 Analog common Aw Digital common Dw CH 0 0H FIRSTPORTB Bit 0 BO CH 8 8L FIRSTPORTB Bit 1 B1 Analog common Aw FIRSTPORTB Bit 2 B2 CH 1 1H FIRSTPORTB Bit 3 CH 9 9L FIRSTPORTB Bit 4 B4 Analog Dig Ctr I O eta Analog common Aw FIRSTPORTB Bit 5 B5 9 7 CH 2 2H FIRSTPORTB Bit 6 B6 CH 10 10L FIRSTPORTB Bit 7 B7 Analog common Aw Digital common Dw CH 3 3H Counter 0 CTO CH 11 11L Counter 1 CT1 Analog common Aw Digital common Dw CH 4 4H FIRSTPORTC Bit 0 CO CH 12 12L FIRSTPORTC Bit 1 C1 Analog common Aw T FIRSTPORTC Bit 2 C2 CH 5 5H p FIRSTPORTC Bit 3 C3 CH 13 13L amp FIRSTPORTC Bit 4 C4 T Analog In Analog common Aw FIRSTPORTC Bit 5 C5 Dig Ctr O CH 6 6H FIRSTPORTC Bit 6 C6 CH 14 14L FIRSTPORTC Bit 7 C7 Analog common Aw Digital common D v CH 7 7H Counter 2 CT2 CH 15 15L Counter 3 CT3 51
21. RG allowing TTL level triggering with latencies guaranteed to be less than 1 us You can program both of the logic levels 1 or 0 and the rising or falling edge for the discrete digital trigger input Software based triggering The three software based trigger modes differ from hardware analog triggering and digital triggering because the readings analog digital or counter are checked by the PC in order to detect the trigger event Analog triggering You can select any analog channel as the trigger channel You can program the trigger level the rising or falling edge to trigger on and hysteresis Pattern triggering You can select any scanned digital input channel pattern to trigger an acquisition including the ability to mask or ignore specific bits Counter triggering You can program triggering to occur when one of the counters meets or exceeds a set value or is within a range of values You can program any of the included counter channels as the trigger source 25 USB 1616HS 2 User s Guide Functional Details Software based triggering usually results in a long period of inactivity between the trigger condition being detected and the data being acquired However the USB 1616HS 2 avoids this situation by using pre trigger data When software based triggering is used and the PC detects the trigger condition which may be thousands of readings after the actual occurrence of the signal the USB 1616HS 2 driver autom
22. STPORTC DAC or timer update latency Chapter 4 Calibrating the USB 1616HS 2 eseeeeeeeseeee 44 Chapter 5 SPecifiCatiOns lm HG 45 Analog input sae decet tiii festes eet ehe Peste diet esie ede Poeti eee den 45 Accuracy Thermocouples p 9 46 Zur e Digital input output COUDILGTS s i ede OR UI E ite iN en b d ER S Input sequencer METAS COIN Gare dete cs nte A Pie Sa neh eae foto Frequency pulse generators esses 49 Power consumption External Power iie hne b peat een iei nadie hen iE USB specifications Environmental Mechanical ee atttem es Signal T O connectors and pin out sese deese ree ede iie ete eire de edes 50 Declaration of 53 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 1616HS 4 so that you get the most out of its analog I O thermocouple TC input digital I O counter timer I O features This user s guide also refers you to related documents available on our web site and to technical support resources Conventions used in this user s guide For more information on
23. USB 1616HS 2 USB based High speed Analog I O and Digital I O Module User s Guide MEASUREMENT COMPUTING USB 1616HS 2 User s Guide AY MEASUREMENT COMPUTING Document Revision 1 August 2007 Copyright 2007 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Refer to www mccdaq com execteam html for the names titles and contact information of each key executive at 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 mission To provide PC based 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 Lifetime warranty Every hardware product manufactured by Measurement Computing Corporation is warranted against defects in materials or workmanship for the life of the product Products found defective are repaired or replaced promptly Lifetime Harsh Environment Warranty We will replace any product manufactured by Measurement Computing Corporation that is damaged
24. an period maximum Counter totalizer Counter totalizer inputs can trigger an acquisition User can select to trigger on a frequency or on triggering total counts that are equal not equal above or below a value or within outside of a window rising falling edge Latency One scan period maximum Frequency pulse generators Table 9 Frequency pulse generator specifications Channels 2 x 16 bit Output waveform Square wave Output rate 1 MHz base rate divided by 1 to 65535 programmable High level output voltage 2 0 V minimum 1 0 mA 2 9 V minimum 400 pA Low level output voltage 0 4 V maximum 400 pA Power consumption Power consumption specification is for a USB 1616HS 2 Add 400mW for a USB 1616HS 2 connected to an AI EXP48 expansion module Table 10 Power consumption specifications Note 5 Power consumption per board 3000 mW 49 USB 1616HS 2 User s Guide Specifications External power Table 11 External power specifications Note 5 Connector Switchcraft RAPC 712 Power range 6 to 16 VDC used when USB port supplies insufficient power or when an independent power supply is desired Over voltage 20 V for 10 seconds maximum Note 5 The power supply MCC p n TR 2U and line cord MCC p n CA 1 are required if the USB port cannot supply adequate power By USB 2 0 standards USB 2 0 ports must supply
25. ard USB 1616HS Series board Figure 3 CA 96A expansion cable 15 Chapter 3 Functional Details This chapter contains detailed information on all of the features available from the board including diagram and explanations of physical board components functional block diagram information on how to use the signals generated by the board diagrams of signals using default or conventional board settings USB 1616HS 2 components These USB 1616HS 2 components are shown in Figure 4 Six removable screw terminal blocks One USB port One external power connector 25 pin expansion connector Two LED indicators Active Power Analog output calibration TTL trigger and pacer signal Analog input screw terminal blocks DSUB25 expansion Analog input screw terminal connector blocks Figure 4 USB 1616HS 2 components front view USB 1616HS 2 User s Guide Functional Details Device Active LED Counter and digital I O port C screw terminal blocks External Power LED Counter and digital I O port B screw terminal blocks USB connector Timer and digital I O port A screw terminal blocks External power connector Figure 5 USB 1616HS 2 components rear view External power connector Although the USB 1616HS 2 is powered by a USB port on a host PC an external power connector may also be required to provide sufficient power for th
26. atically looks back to the location in memory where the actual trigger causing measurement occurred and presents the acquired data that begins at the point where the trigger causing measurement occurs The maximum inactive period in this mode equals one scan period Stop trigger modes You can use any of the software trigger modes explained previously to stop an acquisition For example you can program an acquisition to begin on one event such as a voltage level and then stop on another event such as a digital pattern Pre triggering and post triggering modes The USB 1616HS 2 supports four modes of pre triggering and post triggering providing a wide variety of options to accommodate any measurement requirement When using pre trigger you must use software based triggering to initiate an acquisition No pre trigger post trigger stop event In this simple mode data acquisition starts when the trigger is received and the acquisition stops when the stop trigger event is received Fixed pre trigger with post trigger stop event In this mode you set the number of pre trigger readings to acquire The acquisition continues until a stop trigger event occurs No pre trigger infinite post trigger In this mode no pre trigger data is acquired Instead data is acquired beginning with the trigger event and is terminated when you issue a command to halt the acquisition Fixed pre trigger with infinite post trigger You set the amoun
27. ave a different gain The acquisition is triggered and the samples stream to the PC via the USB cable Each analog channel requires one microsecond of scan time therefore the scan period can be no shorter than 6 us for this example of the digital channels are sampled at the start of scan and do not require additional scanning bandwidth as long as there is at least one analog channel in the scan group The 16 bits of digital input are sampled for every analog sample in the scan group This allows up to 1 MHz digital input sampling while the 1 MHz analog sampling bandwidth is aggregated across many analog input channels The scan period can be made much longer than 6 us up to 1 second The maximum scan frequency is one divided by 6 us or 166 666 Hz Note that digital input channel sampling is not done during the dead time of the scan period where no analog sampling is being done either Start of Scan Start of Scan Start of Scan Start of Scan a C1 C1 C1 C1 co co co co appogg E D D D D D BEER r DD TRE 0 2 5 11 1315 0 2 5 111315 O 2 50111315 0 2 5 11 315 Sean Period Figure 10 Analog and digital scanning once per scan mode example If the three counter channels are all returning 32 bit values and the digital input channel is returning a 1 bit value then 18 samples are returned to the PC every scan period with each sample being 16 bits Each 32 bit counter channel is divided into two 16 bit samples one for
28. couples make sure you configure the channels for differential mode Once selected any program that uses the Universal Library initializes the hardware according to these selections Caution Turn off power to all devices connected to the system before making connections Electrical shock or damage to equipment can result even under low voltage conditions Information on signal connections General information regarding signal connection and configuration is available in the Guide to Signal Connections This document is available on our web site at www mccdag com signals signals pdf Caution Always handle components carefully and never touch connector terminals or circuit components unless you are following ESD guidelines in an appropriate ESD controlled area These guidelines include using properly grounded mats and wrist straps ESD bags and cartons and related procedures Avoid touching board surfaces and onboard components Only handle boards by their edges Make sure the USB 1616HS 2 does not come into contact with foreign elements such as oils water and industrial particulate The discharge of static electricity can damage some electronic components Semiconductor devices are especially susceptible to ESD damage Connecting the board for I O operations Connectors cables main I O connector The following table lists the board connectors applicable cables and compatible accessory products for the USB 1616HS 2
29. d be as high as possible without violating the over voltage specification To ensure adequate switching waveforms should swing at least 0 V to 5 V and have a high slew rate Mapped channels A mapped channel is one of four counter input signals that can get multiplexed into a counter module The mapped channel can participate with the counter s input signal by gating the counter latching the counter and so on The four possible choices for the mapped channel are the four counter input signals post debounce A mapped channel can be used to gate the counter decrement the counter latch the current count to the count register Usually all counter outputs are latched at the beginning of each scan within the acquisition However you can use a second mapped channel to latch the counter output Counter modes A counter can be asynchronously read with or without clear on read The asynchronous read signals strobe when the lower 16 bits of the counter are read by software The software can read the counter s high 16 bits some time later after reading the lower 16 bits The full 32 bit result reflects the timing of the first asynchronous read strobe Totalize mode The Totalize mode allows basic use of a 32 bit counter While in this mode the channel s input can only increment the counter upward When used as a 16 bit counter counter low one channel can be scanned at the 12 MHz rate When used as a 32 bit counter counter high t
30. dow keep a scan period in mind This applies to analog inputs and counter inputs Quickly changing analog input voltages can step over a setpoint window if not sampled often enough There are three possible solutions for overcoming this problem Shorten the scan period to give more timing resolution on the counter values or analog values Widen the setpoint window by increasing limit A and or lowering limit B Acombination of both solutions 1 and 2 could be made 43 Chapter 4 Calibrating the USB 1616HS 2 Every range of a USB 1616HS 2 device is calibrated at the factory using a digital NIST traceable calibration method This method works by storing a correction factor for each range on the unit at the time of calibration For analog inputs the user can adjust the calibration of the board while it is installed in the acquisition system without destroying the factory calibration supplied with the board This is accomplished by having two distinct calibration tables in the USB 1616HS 2 on board EPROM one which contains the factory calibration and the other which is available for field calibration You can perform field calibration automatically in seconds with nstaCal and without the use of external hardware or instruments Field calibration derives its traceability through an on board reference which has a stability of 0 005 per year Note that a two year calibration period is recommended for USB 1616HS 2 boards You shou
31. e USB 1616HS 2 Connect the optional TR 2U power supply to the external power supply connector This power supply provides 9 VDC 1 A power to the USB 1616HS 2 17 USB 1616HS 2 User s Guide Functional Details USB 1616HS 2 block diagram Figure 6 shows a simplified block diagram of the USB 1616HS 2 This board provides all of the functional elements shown in the figure 16 bit 1 MHz 2 D A converters output clock 8 diff 16 SE analog inputs Analog channel input protection One TTL trigger input Programmable gain amplifier x1 x2 x5 x10 x20 x50 x100 NANANA GOSOSOSOG 16 bit 1 MHz converter One analog input pacer clock 512 step random access channel gain sequencer SOOO 0000500000290 Two 16 bit 5 t Q equencer rese Timer outputs Programmable sequencer Four 32 bit timebase S 8 counter inputs 1 us to 6 hours Q g Three 8 bit B Q Q DIO ports A System USB USB port controller controller DSUB25F Configurable PLD External power Configurable DC to DC e EPROM converter Connect the optional power supply if the USB cannot supply enough power Expansion connector Figure 6 USB 1616HS 2 functional block diagram Synchronous I O mixing analog digital and counter scanning The USB 1616HS 2 can read analog digital and counter inputs while generating up to
32. e reflects 10 000 samples at 1 MHz typical differential short Thermocouples Table 3 Thermocouple TC types and accuracy Note 3 TC type Temperature range Accuracy C Noise typical C J 200 to 760 1 7 0 2 K 200 to 1200 1 8 0 2 T 200 to 400 1 8 0 2 E 270 to 650 1 7 0 2 R 50 to 1768 4 8 1 5 S 50 to 1768 4 7 1 5 N 270 to 1300 2 7 0 3 B 300 to 1400 3 0 1 0 Note 3 Assumes 16384 oversampling applied CMV 0 0V 60 minute warm up still environment and 25 C ambient temperature excludes thermocouple error TC 0 C for all types except B 1000 TR 2U power supply for external power Analog outputs Analog output channels can be updated synchronously relative to scanned inputs and clocked from either an internal onboard clock or an external clock source Analog outputs can also be updated asynchronously independent of any other scanning system Table 4 Analog output specifications Channels 2 Resolution 16 bits Data buffer PC based memory Output voltage range 10 V Output current 1 mA Sourcing more current 1 to 10 mA may require a TR 2U power supply Offset error 0 0045 V maximum Digital feed through lt 10 mV when updated DAC analog glitch 12 mV typical at major carry Gain error 0 01 Coupling DC Update rate 1 MHz maximum resolution 20 83 ns Settling time 2 u
33. ections for one encoder to a USB 1616HS 2 module m To external power To ground Ground to Digital Common Counter 0 CNTO To Encoder A Counter 1 CNT1 To Encoder B Counter 2 CNT2 To Encoder 2 ENCODER The ground depicted at the left is associated with Digital Common on the USB 1616HS 4 The ground depicted at the right is associated with the external power source Figure 21 Connections from single encoder to screw terminals on the USB 1616HS 2 The A signal must be connected to an even numbered channel and the associated B signal must be connected to the next higher odd numbered channel For example 1f A were connected to counter 0 then B would be connected to counter 1 Connect each signal A B Z as a single ended connection with respect to the common ground The encoder needs power from an external power output typically 5 VDC Connect the encoder s power input to the power source and connect the return to the digital common of that source Wiring for two encoders The following figure illustrates single ended connections for two encoders Differential connections are not applicable 33 USB 1616HS 2 User s Guide Functional Details Each signal A B can be connected as a single ended connection with respect to the common digital ground GND Both encoders need power from an external power source typically 5 VDC Connect each encoder s power input to the exter
34. ed This warm up time enables the CJC thermistors to more accurately measure the junction at the terminal block Make sure the surrounding environment is thermally stabilized and ideally around 20 C to 30 C If the device s ambient temperature is changing due to a local heating or cooling source then the TC junction temperature may be changing and the CJC thermistor will have a larger error Use small diameter instrument grade TC wire Small diameter TC wire has less effect on the TC junction at the terminal block because less heat is transferred from the ambient environment to the junction Use shielded TC wire see Shielding below with the shield connected to analog common to reduce noise The USB 1616HS 2 has several analog commons on the screw terminals You can also minimize the effect of noise by averaging readings see Averaging below or combining both shielding and averaging Refer to Screw terminal pin outs section starting on page 13 for the locations of these analog common screw terminals Make sure the USB 1616HS 2 is mounted on a flat surface Be careful to avoid loading down the digital outputs too heavily 21 mA Heavy load down causes significant heat generation inside the unit and increase the CJC thermistor error Shielding Use shielded TC wire with the shield connected to analog common to reduce noise The USB 1616HS 2 several analog common screw terminals see Connecting the board for I O operat
35. even due to misuse for only 50 of the current list price I O boards face some tough operating conditions some more severe than the boards are designed to withstand When a board becomes damaged just return the unit with an order for its replacement at only 50 of the current list price We don t need to profit from your misfortune By the way we honor this warranty for any manufacturer s board that we have a replacement for 30 Day Money Back Guarantee You may return any Measurement Computing Corporation product 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 Please call for an RMA number first No credits or returns accepted without a copy of the original invoice Some software products are subject to a repackaging fee 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 HM USB 1616HS 2 doc 3 Trademark and Copyright Information
36. f this number 558 Hz For accurate measurements you must associate TC and CJC channels properly The TC channels must immediately follow their associated CJC channels in the channel array For accurate TC readings associate CJCO with CJC1 with TC1 and TC2 CJC2 with CJC3 with TC4 CJC4 with TC5 and TC6 and CJC5 with TC7 When the AI EXP48 module is connected to the USB 1616HS 2 associate CJC6 with TC8 through TC11 CJC7 with TC12 through TC15 CJC8 with TC16 through TC19 CJC9 with TC20 through TC23 CJC10 with TC24 through TC27 and CJC11 with TC28 through TC31 Example Analog and digital scanning once per scan mode The scan is programmed pre acquisition and is made up of six analog channels Ch0 Ch2 Ch5 Ch11 Ch13 Ch15 and four digital channels 16 bits of digital IO three counter inputs Each of the analog channels can have a different gain The acquisition is triggered and the samples stream to the PC via the USB cable Each analog channel requires one microsecond of scan time Therefore the scan period can be no shorter than 6 us for this example All of the digital channels are sampled at the start of scan and do not require additional scanning bandwidth as long as there is at least one analog channel in the scan group The scan period can be made much longer than 6 us up to second The maximum scan frequency is one divided by 6 us or 166 666 Hz Start of Scan Start of Scan Start of Scan Start
37. gineering 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
38. id reference value is present and that the first trigger is legitimate Figure 19 Representation of rotary shaft quadrature encoder The concentric pattern for B has the same number of window pairs as A except that the entire pattern is rotated by 1 4 of a window pair Thus the B signal is always 90 degrees out of phase from the A signal The A and B signals pulse 512 times or 1024 4096 etc per complete rotation of the encoder The concentric pattern for the Z signal has only one transparent window and therefore pulses only once per complete rotation Representative signals are shown in the following figure Se E LI LI LI LI LI LJ 2 E Figure 20 Representation of quadrature encoder outputs A B and Z As the encoder rotates the A or B signal indicates the distance the encoder has traveled The frequency of A or B indicates the velocity of rotation of the encoder If the Z signal is used to zero a counter that is clocked by A then that counter will give the number of pulses the encoder has rotated from its reference The Z signal is a reference marker for the encoder It should be noted that when the encoder is rotating clockwise as viewed from the back A will lead B and when the encoder is rotating counterclockwise A will lag B If the counter direction control logic is such that the counter counts upward when A leads B and counts downward when A lags B then the counter will give direction co
39. igger TRG Digital common Dw Output scan clock I O DPR Timer 0 TO Input scan clock I O APR Timer 1 T1 Analog common Aw Digital common Dw CH 0 HI 0H FIRSTPORTB Bit 0 BO CH 0 LO 8L FIRSTPORTB Bit 1 B1 Analog common Aw FIRSTPORTB Bit 2 B2 CH 1 HI 1H T FIRSTPORTB Bit 3 B3 CH 1 LO 9L FIRSTPORTB Bit 4 B4 Analog in Analog common Av FIRSTPORTB Bits Bs Dig Ctr VO CH 2 HI 2H FIRSTPORTB Bit 6 CH 2 LO 10L FIRSTPORTB Bit 7 B7 Analog common Aw Digital common Dw CH 3 HI 3H Counter 0 CTO CH 3 LO 11L Counter 1 CT1 Analog common Aw Digital common Dw CH 4 HI 4H FIRSTPORTC Bit 0 CH 4 LO 12L FIRSTPORTC Bit 1 C1 Analog common Aw FIRSTPORTC Bit 2 C2 CH 5 HI 5H z FIRSTPORTC Bit 3 C3 CH 5 LO 13L FIRSTPORTC Bit 4 C4 Analog In Analog common E FFIRSTPORTC Bit 5 Dig Ctr I O CH 6 HI 6H FIRSTPORTC Bit 6 C6 CH 6 LO 14L FIRSTPORTC Bit 7 C7 Analog common Aw Digital common Dw CH 7 HI 7H Counter 2 CT2 CH 7 LO 15L Counter 3 CT3 DSUB25F expansion connector 13 25 1 14 Figure 2 DSUB25 expansion connector pin out 14 USB 1616HS 2 User s Guide Installing the USB 1616HS 2 Cabling Use a CA 96A 25 pin expansion cable CA 96A expansion cable to connect to the USB 1616HS 2 s 25 pin expansion connector 14 25 pin female D connector 25 pin male D connector connect to the connect to the AI EXP48 expansion bo
40. ing of time period but never stays high for a period of time equal to the debounce time setting equal to T2 for this example 2 At the end of time period T2 the input signal has transitioned high and stayed there for the required amount of time therefore the output transitions high If the input signal does not stabilize in the high state long enough no transition would have appeared on the output and the entire disturbance on the input would have been rejected T3 During time period T3 the input signal remained steady No change in output is seen T4 During time period T4 the input signal has more disturbances and does not stabilize in any state long enough No change in the output is seen 5 At the end of time period T5 the input signal has transitioned low and stayed there for the required amount of time therefore the output goes low Trigger before stable mode In the trigger before stable mode the output of the debounce module immediately changes state but will not change state again until a period of stability has passed For this reason the mode can be used to detect glitches 29 USB 1616HS 2 User s Guide Functional Details Figure 15 Debounce module Trigger before stable mode The following time periods T1 through T6 pertain to the above drawing 1 the illustrated example the input signal is low for the debounce time equal to therefore when the input edge a
41. ing scanned the digital inputs can sustain rates up to 4 MHz Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred Digital outputs and pattern generation Digital outputs can be updated asynchronously at anytime before during or after an acquisition You can use two of the 8 bit ports to generate a digital pattern at up to 4 MHz The USB 1616HS 2 supports digital pattern generation with bus mastering DMA The digital pattern can be read from PC RAM Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred Digital pattern generation is clocked using an internal clock The onboard programmable clock generates updates ranging from once every second to 1 MHz independent of any acquisition rate Triggering Triggering can be the most critical aspect of a data acquisition application The USB 1616HS 2 supports the following trigger modes to accommodate certain measurement situations 24 USB 1616HS 2 User s Guide Functional Details Hardware analog triggering The USB 1616HS 2 uses true analog triggering in which the trigger level you program sets an analog DAC which is then compared in hardware to the analog input level on the selected channel This guarantees an analog trigger latency that is less than 1 us You can select any analog channel as the trigger channel but the selected channel must be the first channel in the scan
42. ional components innreise pre FE RON ER FUN cane abe teh bed staan bade end 9 Additional documentatiOn do eene ee Eng e tk n eina ine do edat do hee ean ene Go ie une dea eani 10 Unpacking the USB 1616HS 2 eee BATE ees ERE Io etta toe tbe a ecol dte dou tte 10 Installing the software Installing the hardware ee eH RR ect 11 Configuring the h rdware cese recte ie ee ade ede dede eed Re edenda 12 Connecting the board for I O operations esessessessesseseeeee eene nennen enne enne nennen 12 Connectors cables main I O connector seen nennen eene eene eene entrare entree eene nenne nnt 12 Scr w terminal reines ore ente ien Feet uana EEA EE E EEE eausa co aea DSUB25F expansion connector Chapter 3 Functional Details RE USB 1616HS 2 components USB 1616HS 2 block diagram Synchronous I O mixing analog digital and counter scanning eene 18 P NIFT UE 19 Analog input scanning o aer cde e eee e ete be o p de ede edet ub b f deed ere hee bs 19 Thermocouple TBput tO pte telis idees Tips for making accurate temperature measurements sess Amalog Output oe d P rrr
43. ions starting on page 12 You can connect the shield of a shielded thermocouple to one of the analog commons When this connection is made leave the shield at the other end of the thermocouple unconnected Caution Connecting the shield to common at both ends results in a ground loop Averaging Certain acquisition programs apply averaging after several samples have been collected Depending on the nature of the noise averaging can reduce noise by the square root of the number of averaged samples 22 USB 1616HS 2 User s Guide Functional Details Although averaging can be effective it suffers from several drawbacks Noise in measurements only decreases as the square root of the number of measurements reducing RMS noise significantly may require many samples Thus averaging is suited to low speed applications that can provide many samples Only random noise is reduced or eliminated by averaging Averaging does not reduce or eliminate periodic signals Analog output The USB 1616HS 2 has two 16 bit 1 MHz analog output channels Analog outputs can be updated at a maximum rate of 1 MHz The channels have an output range of 10 V to 10 V Each D A can continuously output a waveform In addition a program can asynchronously output a value to any of the D A channels for non waveform applications assuming that the D A is not already being used in the waveform output mode When used to generate waveforms you can clock the
44. k APR External input scan clock APR Digital input trigger sources and modes See Table 8 Digital output trigger sources Start of input scan Data transfer DMA Sampling update rate 4 MHz maximum rates up to 12 MHz are sustainable on some platforms Pattern generation output Two of the 8 bit ports can be configured for 16 bit pattern generation The pattern can also be updated synchronously with an acquisition at up to 4 MHz 47 USB 1616HS 2 User s Guide Specifications Counters Counter inputs can be scanned based on an internal programmable timer or an external clock source Table 6 Counter specifications Channels 4 independent Resolution 32 bit Input frequency 20 MHz maximum Input signal range 5 V to 10 V Input characteristics 10 kQ pull up 200 Q series resistor 15 kV ESD protection Trigger level TTL Minimum pulse width 25 ns high 25 ns low Debounce times 16 selections from 500 ns to 25 5 ms positive or negative edge sensitive glitch detect mode or debounce mode Time base accuracy 50 ppm 0 to 50 C Counter read pacer Onboard input scan clock external input scan clock APR Trigger sources and modes See Table 8 Programmable mode Counter Counter mode options Totalize clear on read rollover stop at all Fs 16 or 32 bit any other channel can gate the counter Input sequencer Analog digita
45. kes 1 1s plus the actual conversion time of the D A converter i e another 215 worst case Going back to the above example if the setpoint for analog input Channel 2 required a DAC update it would occur 5 after the ADC conversion for Channel 2 or after the start of the scan When using setpoints to control any of the DAC outputs increased latencies may occur if attempting to stream data to DACs or pattern digital output at the same time The increased latency can be as long as the period of the output scan clock For these reasons avoid streaming outputs on any DAC or pattern digital output when using setpoints to control DACs FIRSTPORTC DAC or timer update latency Setpoints allow analog outputs DACs timers or FIRSTPORTC digital outputs to update very quickly Exactly how fast an output can update is determined by these factors scan rate synchronous sampling mode type of output to be updated 42 USB 1616HS 2 User s Guide Functional Details For example you set an acquisition to have a scan rate of 100 kHz which means each scan period is 10 us Within the scan period you sample six analog input channels These are shown in the following figure as channels 1 through 6 The ADC conversion occurs at the beginning of each channel s 1 us time block t 1 2 3 4 S 6 11 2 3 4 5 6 jus Ss 10us Start of Scan Start of Scan FIRSTPORTC Fig
46. l and counter inputs can be scanned based on either an internal programmable timer or an external clock source Table 7 Input sequencer specifications Input scan clock sources two see Note 4 Internal programmable Analog channels from 1 us to 1 s in 20 83 ns steps Digital channels and counters from 250 ns to 1 s in 20 83 ns steps External TTL level input APR Analog channels down to 1 us minimum Digital channels and counters down to 250 ns minimum Programmable parameters per scan Programmable channels random order programmable gain Depth 512 locations Onboard channel to channel scan rate Analog 1 MHz maximum Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled External input scan clock APR maximum Analog 1 0 MHz rate Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled Clock signal range Logical zero 0 V to 0 8 V Logical one 2 4 V to 5 0 V Minimum pulse width 50 ns high 50 ns low Note 4 The maximum scan clock rate is the inverse of the minimum scan period The minimum scan period is equal to 1 us times the number of analog channels If a scan contains only digital channels then the minimum scan period is 250 ns Some platforms can sustain clock rates up to 83 33 ns 48 USB 1616HS 2 User s Guide Specifications Triggering Table 8 Trigger sources and modes Trigger source
47. l or 48 single ended inputs to the USB 1616HS 2 CA 96A expansion cable Expansion cable for connecting to the AI EXP48 expansion board Additional documentation In addition to this hardware user s guide you should also receive the Quick Start Guide available in PDF at www mccdaq com PDFEmanuals DAQ Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB 1616HS 2 and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB 1616HS 2 As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB 1616HS 2 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 If any components are missing or damaged notify Measurement Computing Corporation immediately by phone fax or e mail 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 Installing the software Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data Acquisition Software CD This booklet is available in PDF at www mccdaq com PDFmanuals DA Q Software Quick Start pdf We recommend that y
48. ld calibrate the USB 1616HS 2 using nstaCal after the board has fully warmed up The recommended warm up time is 30 minutes For best results calibrate the board immediately before making critical measurements The high resolution analog components on the board are somewhat sensitive to temperature Pre measurement calibration ensures that your board is operating at optimum calibration values 44 Chapter 5 Specifications Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input Table 1 Analog input specifications A D converter type Successive approximation Resolution 16 bits Number of channels 16 single ended 8 differential software selectable Up to 48 additional analog inputs per module are available with the optional AI EXP48 module Expansion channel features are the same as those of the main channels Input ranges software and Bipolar 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V sequencer programmable Maximum sample rate 1 MHz Nonlinearity integral 2 LSB maximum Nonlinearity differential 1 LSB maximum A D pacing Onboard input scan clock external source APR Trigger sources and modes See Table 8 Acquisition data buffer 1 MSample Data transfer DMA Configuration memory Programmable I O Maximu
49. m usable input Range 10 V 5 V 2 1 0 5 V 10 5 maximum voltage common mode voltage CMV Vin Range 0 2 V 0 1 V 2 1 V maximum Signal to noise and distortion 72 dB typical for 10 V range 1 kHz fundamental Total harmonic distortion 80 dB typical for 10 V range 1 kHz fundamental Calibration Auto calibration calibration factors for each range stored onboard in non volatile RAM CMRR 60 Hz 70 dB typical DC to 1 kHz Bias current 40 pA typical 0 to 35 Crosstalk 75 dB typical DC to 60 Hz 65 dB typical 10 kHz Input impedance 10 single ended 20 MX differential Absolute maximum input 30V voltage Accuracy Table 2 Analog input accuracy specifications Voltage range Accuracy Temperature coefficient Noise cts of reading of reading ppm range C RMS range 23 C 10 C 1 year 10 Vto 10 V 0 031 0 008 14 8 2 0 5Vto5V 0 031 0 009 14 9 30 2Vto2V 0 031 0 010 14 10 20 1VtolV Note 1 0 031 0 02 14 12 35 Note 2 500 mV to 500 mV 0 031 0 04 14 18 55 200 mV to 200 mV 0 036 0 075 14 12 8 0 100 mV to 100 mV 0 042 0 15 14 18 14 0 45 USB 1616HS 2 User s Guide Specifications Note 1 Specifications assume differential input single channel scan 1 MHz scan rate unfiltered CMV 0 0 V 30 minute warm up exclusive of noise range is FS to FS Note 2 Nois
50. mmable up to 16384 oversamples per channel in the scan group When oversampling is applied it is applied to all analog channels in the scan group including temperature and voltage channels Digital channels are not oversampled 19 USB 1616HS 2 User s Guide Functional Details If you want 256 oversamples then each analog channel in the scan group will take 256 us and the returned 16 bit value represents an average of 256 consecutive us samples of that channel The acquisition is triggered and 16 bit values each representing an average of 256 stream to the PC via the USB cable Since two of the channels in the scan group are temperature channels you need the acquisition engine to read a cold junction compensation CJC temperature every scan Start of Scan Start of Scan Start of Scan Start of Scan cesi s ri 12 13 5 111 2o 5 Ia To T 3 2 5 To o 3 Bos 5 n To To 3 55 Programmable Averaging Scan up to 256 Period Figure 8 Analog channel scanning of voltage and temperature inputs example Since the targeted number of oversamples is 256 in this example each analog channel in the scan group requires 256 microseconds to return one 16 bit value The oversampling is also done for CJC temperature measurement channels making the minimum scan period for this example 7 x 256 us or 1792 us The maximum scan frequency is the inverse o
51. nal is above 16 bit low limit so 16 bit high limit is not used Less than value Signal is below 16 bit high limit so 16 bit low limit is not used Equal to value Signal is equal to 16 bit high limit and limit B is not used The equal to mode is intended for use when the counter or digital input channels are the source channel You should only use the equal to16 bit high limit limit A mode with counter or digital input channels as the channel source If you want similar functionality for analog channels then use the inside window mode Hysteresis mode Outside the window high forces output 2 until an outside the window low condition exists then output 1 is forced Output 1 continues until an outside the window high condition exists The cycle repeats as long as the acquisition 1s running in hysteresis mode Set output channel None Update FIRSTPORTC Update DAC Update timerx Update modes Update on True only Update on True and False Set values for output 16 bit DAC value FIRSTPORTC value or timer value when input meets criteria 16 bit DAC value FIRSTPORTC value or timer value when does not meet criteria By default FIRSTPORTC comes up as a digital input You may want to initialize FIRSTPORTC to a known state before running the input scan to detect the setpoints When using setpoints with triggers other than immediate hardware analog or TLL the setpoint criteria evaluation begins immediatel
52. nal power source Connect the return to digital common GND on the same source Ground to Digital 1 To external power Counter 0 CNTO To Encoder 1 A To ground Counter 1 CNT1 To Encoder 1 Counter 2 CNT2 To Encoder 2 A Counter 3 CNT3 To Encoder 2 B ENCODER ENCODER The ground depicted at the left is associated with Digital Common on the USB 1616HS 4 The ground depicted at the right is associated with the external power source Figure 22 Connections from two encoders to screw terminals on the USB 1616HS 2 Timer outputs Two 16 bit timer outputs are built into every USB 1616HS 2 Each timer output can generate a different square wave with a programmable frequency in the range of 16 Hz to 1 MHz 3 3V Terminal Block Timer Generator 100 Q Figure 23 Typical USB 1616HS 2 timer channel Example Timer outputs Timer outputs are programmable square waves The period of the square wave can be as short as 1 us or as long as 65535 us Refer to the table below for examples of timer output frequencies Timer output frequency examples Divisor Timer output frequency 1 1 MHz 100 10 kHz 1000 1 kHz 10000 100 Hz 65535 15 259 Hz in asynchronous write Turns timer off for setpoint operation The two timer outputs can generate different square waves The timer outputs can be updated asynchronously at any time
53. nalog input Channel 7 also has an inside the window setpoint applied Whenever channel 7 s input goes inside the programmed window DAC2 is updated with 7 0 V Limit A for channel 3 Limit B for channel 3 Detection channel 3 Detection channel 7 Start of acquisition 30V Denotes DAC update DAC2 0 0 V 30V Figure 29 Using two criteria to control an output The update on 7rue only mode was selected and therefore the updates for DAC2 only occur when the criteria 1s met However in the above figure we see that there are two setpoints acting on one DAC We can also see that the two criteria can be met simultaneously When both criteria are True at the same time the DAC2 voltage is associated with the criteria that has been most recently met Detecting setpoints on a totalizing counter In the following figure Channel 1 is a counter in totalize mode Two setpoints define a point of change for Detect 1 as the counter counts upward The detect output 1s high when inside the window greater than Limit B the low limit but less than Limit A the high limit In this case the Channel 1 setpoint is defined for the 16 lower bits of channel 1 s 32 bit value The FIRSTPORTC digital output port could be updated on a True condition the rising edge of the detection signal Alternately one of the DAC output channels or timer outputs could be updated with a value 4l USB 1616HS 2 User s Guide Functional Details
54. nd DACI was then updated with 1 0 V You can program control outputs programmed on each setpoint and use the detection for channel 4 to update the FIRSTPORTC digital output port with one value 70 h in the example when the analog input voltage is within the shaded region and a different value when the analog input voltage is outside the shaded region 30 h in the example Detection on an analog input timer output updates Update Mode Update on True and False Criteria Used Inside window Figure 27 shows how a setpoint can be used to update a timer output Channel 3 is an analog input channel A setpoint is applied using update on True and False with a criteria of inside the window where the signal value is inside the window when simultaneously less than Limit A but greater than Limit B Whenever the channel 3 analog input voltage is inside the setpoint window condition True Timer0 is updated with one value and whenever the channel 3 analog input voltage is outside the setpoint window condition False timer0 will be updated with a second output value 39 USB 1616HS 2 User s Guide Functional Details Limit for channel 3 Channel 3 analog input voltage Limit B for channel 3 Detection signal TimerO Figure 27 Timer output update on True and False Using the hysteresis function Update mode N A the hysteresis option has a forced update built into the function Criteria used Window criteria for above a
55. nd below the set limits Figure 28 shows analog input Channel 3 with a setpoint which defines two 16 bit limits Limit A High and Limit B Low These are being applied in the hysteresis mode and DAC channel 0 is updated accordingly In this example Channel 3 s analog input voltage is being used to update DACO as follows When outside the window low below limit B DACO is updated with 3 0 V This update remains in effect until the analog input voltage goes above Limit A When outside the window high above limit A DACO is updated with 7 0 V This update remains in effect until the analog input signal falls below limit B At that time we are again outside the limit low and the update process repeats itself Hysteresis mode can also be done with FIRSTPORTC digital output port or a timer output instead of a DAC Channel 3 analog input voltage Limit Limit B Detection DACO Figure 28 Channel 3 in hysteresis mode 40 USB 1616HS 2 User s Guide Functional Details Using multiple inputs to control one DAC output Update mode Rising edge for each of two channels Criteria used Inside window for each of two channels The figure below shows how multiple inputs can update one output In the following figure the DAC2 analog output is being updated Analog input Channel 3 has an inside the window setpoint applied Whenever Channel 3 s input goes inside the programmed window DAC2 will be updated with 3 0 V A
56. nel 5 example below limit channel 4 example inside window In this example channel 5 is programmed with reference to one setpoint imit A defining a low limit Channel 4 1s programmed with reference to two setpoints limit A and limit B which define a window for that channel Channel Condition State of detect signal Action gt Below limit A for True When channel 5 analog input voltage is below the limit channel 5 A update DACI with output value 0 0 V False When the above stated condition is false update DACI with the Output Value of 1 0 V 4 Within window True When Channel 4 s analog input voltage is within the between limit A and window update FIRSTPORTC with 70h limit B for channel 4 False When the above stated condition is Fa se channel 4 analog input voltage is outside the window update FIRSTPORTC with 30h Channel 5 analog input voltage Limit for channel 5 38 USB 1616HS 2 User s Guide Functional Details 32767 Limit A for channel 4 Limit B for channel 4 0 FIRSTPORTC 32767 Detection signal for channel 4 Figure 26 Analog inputs with setpoints update on True and False In the channel 5 example the setpoint placed on analog Channel 5 updated DACI with 0 0 V The update occurred when channel 5 s input was less than the setpoint limit A When the value of channel 5 s input was above setpoint limit A the condition of lt A was false a
57. nt as defined by Standards EN 61326 1998 or IEC 61326 1998 Shielded wires must be used for all I Os and must be less than 3 meters 9 75 feet in length Clips must be used with the AI EXP48 The host computer must be properly grounded The host computer must be USB2 0 compliant and IOtech USB cables CA 179 x must be used fusing the USB 1616HS Series device in a high RF environment 3 to 10 V m then a clamp on ferrite IOtech p n L 8 1 may be needed on the USB cable otherwise communication may be disrupted protective ESD wrist strap should be used when connecting or disconnecting leads from screw terminal blocks Alternatively unplug the unit from the host computer when making connections Protective housings IOtech p n CN 241 12 can be placed over the removable terminal blocks to protect signals from ESD during operation If external DC power is needed a TR 2U power supply must be used Note Data acquisition equipment may exhibit noise or increased offsets when exposed to high RF fields 73V m or transients Declaration of Conformity based on tests conducted by Smith Electronics Inc Cleveland OH 44141 USA in December 2005 Test records are outlined in Smith Electronics Test Report Personal Daq 3000 Series with PDQ30 Expansion Module and PDAQ3000 PDQ30 Addenda We hereby declare that the equipment specified conforms to the above Directives and Standards Paul Wittibschlager Director of Hardware En
58. ntrol as well as distance from the reference 32 USB 1616HS 2 User s Guide Functional Details Maximizing encoder accuracy If there are 512 pulses on A then the encoder position is accurate to within 360 512 You can get even greater accuracy by counting not only rising edges on A but also falling edges on A giving position accuracy to 360 degrees 1024 You get maximum accuracy counting rising and falling edges on A and on B since B also has 512 pulses This gives a position accuracy of 360 2048 These different modes are known as X1 X2 and X4 Connecting the USB 1616HS 2 to an encoder You can use up to two encoders with each USB 1616HS 2 in your acquisition system Each A and B signal can be made as a single ended connection with respect to common ground Differential applications are not supported For single ended applications Connect signals A B and Z to the counter inputs on the USB 1616HS 2 Connect each encoder ground to GND You can also connect external pull up resistors to the USB 1616HS 2 counter input terminal blocks by placing a pull up resistor between any input channel and the encoder power supply Choose a pull up resistor value based on the encoder s output drive capability and the input impedance of the USB 1616HS 2 Lower values of pull up resistors cause less distortion but also cause the encoder s output driver to pull down with more current Wiring to one encoder Figure 21 shows the conn
59. on our web site at www mccdaq com PDFmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on our web site at www mccedaq com PDFmanuals sm ul functions pdf MCC s Universal Library for LabVIEW User s Guide is available on our web site at www mecdag com PDFmanuals SM UL LabVIEW pdf USB 1616HS 2 User s Guide this document is also available on our web site at www mcecdag com PDFmanuals USB 1616HS 2 pdf Chapter 1 Introducing the USB 1616HS 2 Overview USB 1616HS 2 features The USB 1616HS 2 is supported under popular Microsoft Windows operating systems The USB 1616HS 2 board is a multifunction measurement and control board designed for the USB bus The USB 1616HS 2 provides either eight differential 16 single ended analog inputs with 16 bit resolution It offers seven software selectable analog input ranges of 10 V 5 V 2 V 1 V 0 5 V 0 2 V and 0 1V You can configure up to eight of the analog inputs as differential thermocouple TC inputs The USB 1616HS 2 has two 16 bit 1 MHz analog output channels with an output range of 10 V to 10 V The board has 24 high speed lines of digital I O two timer outputs and four 32 bit counters It provides up to 4 MHz scanning on all digital input lines Six banks of removable screw terminal blocks provide connectivity to the analog input channels digital I O lines counter timer
60. or without debounce In this case the debounce time setting is ignored and the input signal goes straight from the inverter or inverter bypass to the counter module 28 USB 1616HS 2 User s Guide Functional Details There are 16 different debounce times In either debounce mode the debounce time selected determines how fast the signal can change and still be recognized The two debounce modes are trigger after stable and trigger before stable A discussion of the two modes follows Inverter Bypass Debounce Bypass Trigger Before Stable From SCSI Connector To Counters Buffer Inverter warn Stable OUT Figure 13 Debounce model block diagram Trigger after stable mode In the trigger after stable mode the output of the debounce module does not change state until a period of stability has been achieved This means that the input has an edge and then must be stable for a period of time equal to the debounce time Input Output Figure 14 Debounce module trigger after stable mode The following time periods T1 through T5 pertain to Figure 14 In trigger after stable mode the input signal to the debounce module is required to have a period of stability after an incoming edge in order for that edge to be accepted passed through to the counter module The debounce time for this example is equal to T2 and TS In the example above the input signal goes high at the beginn
61. oration Life support devices systems are devices or systems which 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 Table of Contents Preface About this User s Guide ceeded en cubic nee etie cedere rede e Ernie TR cce 7 What you will learn from this user s 1 2 nennen enne nennen enne 7 Conventions used in this user s guide sssssssssssseseeeee eene enne ener enn enn nennen 7 Where to find more information sss eren enne nnne reete enne eterne nnns 7 Chapter 1 Introducing the USB 1616HS 2 eeeeeeeeeeeeeee eee nnne entr nn ne nnnn nennt inse neni innen nni n nenne nn 8 Overview USB 1616HS 2 features E serene nenne rene nnns 8 Software features ea uta e ie OO e UD RR we en eU 8 Chapter 2 Installingithe USB 1616HS 2 2 Renee Dee en bet Dna Piae ee ae 9 What comes with your USB 1616HS 2 shipment nnns 9 lard Ware ato RR eM 9 Opt
62. ou download the latest Windows Update onto your computer before installing and operating the USB 1616HS 2 USB 1616HS 2 User s Guide Installing the USB 1616HS 2 Installing the hardware To connect the USB 1616HS 2 to your system turn your computer on and then do the following Connect signal lines to the USB 1616HS 2 s removable screw terminal blocks o Connect voltage signals as single ended or differential connections see Figure 1 o Connect thermocouple signals as differential connections see Figure 1 The negative typically the red thermocouple wire connects to the channel s LO connector and the other color wire connects to the channel s HI connector Always use differential input mode for thermocouple connections Thermocouple TA re np INMI OI gp Figure 1 Single ended voltage connections V4 and V2 and differential thermocouple connections V3 If you are using an AI EXP48 expansion device connect it to the USB 1616HS 2 Make sure you do not connect the AI EXPAS to a live USB 1616HS 2 If the USB cable is connected to the computer unplug it before you connect the AI EXP48 Ifyou are using the TR 2U external supply sold separately connect the power supply to the USB 1616HS 2 s external power connector and plug the other end into a power outlet The TR 2U is optional but can be used in any scenario You may need a TR 2U power supply if the USB port does not provide enough
63. pplications leave the settling time at its default of 1 ps However if you are scanning multiple channels and one or more channels are connected to a high impedance source you may get better results by increasing the settling time Remember that increasing the settling time reduces the maximum acquisition rate You can set the settling time to 1 us 5 us 10 us 1 ms Example Analog channel scanning of voltage inputs Figure 7 shows a simple acquisition The scan is programmed pre acquisition and is made up of six analog channels Ch0 Ch1 Ch3 Ch4 Ch6 and Ch7 Each of these analog channels can have a different gain The acquisition is triggered and the samples stream to the PC Each analog channel requires one microsecond of scan time therefore the scan period can be no shorter than 6 us for this example The scan period can be made much longer than 6 uis up to s The maximum scan frequency is one divided by 6 us or 166 666 Hz Start of Scan Start of Scan Start of Scan Start of Scan EE 113 4 16 17 113 4 6 1 ps Scan Period Figure 7 Analog channel scan of voltage inputs example Example Analog channel scanning of voltage and temperature inputs Figure 8 shows a programmed pre acquisition scan made up of six analog channels Ch0 Chl Ch5 Ch11 Ch12 Ch13 Each of these analog channels can have a different gain You can program channels 0 and 1 to directly measure TCs In this mode oversampling is progra
64. rrives at the end of time period T1 it is accepted and the output of the debounce module goes high Note that a period of stability must precede the edge in order for the edge to be accepted T2 During time period T2 the input signal is not stable for a length of time equal to the debounce time setting for this example Therefore the output stays high and does not change state during time period T2 T3 During time period T3 the input signal is stable for a time period equal to meeting the debounce requirement The output is held at the high state This is the same state as the input 4 Atanytime during time period 4 the input can change state When this happens the output will also change state At the end of time period T4 the input changes state going low and the output follows this action by going low 5 During time period T5 the input signal again has disturbances that cause the input to not meet the debounce time requirement The output does not change state T6 After time period T6 the input signal has been stable for the debounce time and therefore any edge on the input after time period T6 is immediately reflected in the output of the debounce module Debounce mode comparisons Figure 16 shows how the two modes interpret the same input signal which exhibits glitches Notice that the trigger before stable mode recognizes more glitches than the trigger after stable mode Use the bypa
65. s to rated accuracy Pacer sources Four programmable sources Onboard output scan clock independent of input scan clock Onboard input scan clock External output scan clock DPR independent of external input scan clock APR External input scan clock APR Trigger sources Start of input scan 46 USB 1616HS 2 User s Guide Specifications Digital input output Table 5 Digital input output specifications Number of I O 24 Ports Three banks of eight Each port is programmable as input or output Input scanning modes Two programmable Asynchronous under program control at any time relative to input scanning Synchronous with input scanning Input characteristics 220 series resistors 20 pF to common Logic keeper circuit Holds the logic value to 0 or 1 when there is no external driver Input protection 15 kV ESD clamp diodes parallel Input high 2 0 V to 5 0 V Input low 0 to 0 8 V Output high gt 2 0 V Output low lt 0 8 V Output current Output 1 0 mA per pin Sourcing more current may require a TR 2U power supply Digital input pacing Onboard input scan clock external input scan clock APR Digital output pacing Four programmable sources Onboard output scan clock independent of input scan clock Onboard input scan clock External output scan clock DPR independent of external input scan cloc
66. ss option to achieve maximum glitch recognition Debounce Debounce 1 Debounce Time Time Time i 4 I Input Trigger Before Stable i Trigger After Stable BE Figure 16 Example of two debounce modes interpreting the same signal Debounce times should be set according to the amount of instability expected in the input signal Setting a debounce time that is too short may result in unwanted glitches clocking the counter Setting a debounce time too long may result in an input signal being rejected entirely Some experimentation may be required to find the appropriate debounce time for a particular application To see the effects of different debounce time settings simply view the analog waveform along with the counter output This can be done by connecting the source to an analog input 30 USB 1616HS 2 User s Guide Functional Details Use trigger before stable mode when the input signal has groups of glitches and each group is to be counted as one The trigger before stable mode recognizes and counts the first glitch within a group but rejects the subsequent glitches within the group if the debounce time is set accordingly The debounce time should be set to encompass one entire group of glitches as shown in the following diagram Debounce Time QE d Input Trigger Before Stable Trigger After Stable Figure 17 Optimal debounce time for
67. t designated as Output 1 Detect Rising Edge Detect Falling Edge Condition True Condition False Channel EDT Lu Input Criteria Condition Action Figure 24 Diagram of detection setpoints A digital detect signal is used to indicate when a signal condition is True or False for example whether or not the signal has met the defined criteria The detect signals can be part of the scan group and can be measured as any other input channel thus allowing real time data analysis during an acquisition The detection module looks at the 16 bit data being returned on a channel and generates another signal for each channel with a setpoint applied Detect for Channel 1 Detect2 for Channel 2 and so on These signals serve as data markers for each channel s data It does not matter whether that data 1s volts counts or timing A channel s detect signal shows a rising edge and is True 1 when the channel s data meets the setpoint criteria The detect signal shows a falling edge and 1s False 0 when the channel s data does not meet the setpoint criteria The 7rue and False states for each setpoint criteria are explained in the Using the setpoint status register section on page 37 35 USB 1616HS 2 User s Guide Functional Details Criteria input signal is equal to X Action driven by condition Compare Setpoint definition Update conditions X to choose one True only J If True then outpu
68. t of pre trigger data to acquire Then the system continues to acquire data until the program issues a command to halt acquisition Counter inputs Four 32 bit counters are built into the USB 1616HS 2 Each counter accepts frequency inputs up to 20 MHz USB 1616HS 2 counter channels can be configured as standard counters or as multi axis quadrature encoders The counters can concurrently monitor time periods frequencies pulses and other event driven incremental occurrences directly from pulse generators limit switches proximity switches and magnetic pick ups Counter inputs can be read asynchronously under program control or synchronously as part of an analog or digital scan group 26 USB 1616HS 2 User s Guide Functional Details When reading synchronously all counters are set to zero at the start of an acquisition When reading asynchronously counters may be cleared on each read count up continually or count until the 16 bit or 32 bit limit has been reached See counter mode explanations below 3 3V 5V 10 KQ Terminal Counter Block 200 Q Figure 12 Typical USB 1616HS 2 counter channel Tips for making high speed counter measurements gt 1 MHz Use coax or twisted pair wire Connect one side to Digital Common If the frequency source is tolerant parallel terminate the coax or twisted pair with a 50 Q 100 resistor at the terminal block The amplitude of the driving waveform shoul
69. t value 1 Limit A or Shey oe If False then perform no action Limit B Above B X gt True and False If True then output value 1 If False then output value 2 True only Window If True then output value 1 non hyste Inside B lt X lt A If False then perform no action resis Outside B gt X or X gt A True and False mode If True then output value 1 If False then output value 2 Hysteresis mode forced update If X gt A is True then output value 2 until X lt B is True then output value 1 If X lt Bis True then output value 1 until X gt A is True then Window A output value 2 Below A X B Both ci d hysteresis ne This is saying conditions are checked when mode a If the input signal is outside the window high output value 2 until in hysteresis mode the signal goes outside the window ow and b if the signal is outside the window ow output value 1 until the signal goes outside the window high There is no change to the detect signal while within the window The detect signal has the timing resolution of the scan period as seen in the diagram below The detect signal can change no faster than the scan frequency 1 scan period Detectl Detect Detect3 Acquisition stream Scan Group Ch 1 2 3 4 ete Scan Figure 25 Example diagram of detection signals for channels 1 2
70. the low word and the other for the high word If the maximum scan frequency is 166 666 Hz then the data bandwidth streaming into the PC is 3 MS s Some slower PCs may have a problem with data bandwidths greater than 6 MS s The USB 1616HS 2 has an onboard MS buffer for acquired data 21 USB 1616HS 2 User s Guide Functional Details Thermocouple input You can configure up to eight analog inputs in differential mode on the USB 1616HS 2 to accept a thermocouple TC input Built in cold junction sensors are provided for each of the screw terminal connectors and any TC type can be attached to any of the eight thermocouple channels When measuring TCs the USB 1616HS 2 can operate in an averaging mode taking multiple readings on each channel applying digital filtering and cold junction compensation and then converting the readings to temperature As a result the USB 1616HS 2 measures channels with TCs attached at a rate from 50 Hz to 10 kHz depending on how much over sampling is selected Additionally a rejection frequency can be specified in which over sampling occurs during one cycle of either 50 Hz or 60 Hz providing a high level of 50 Hz or 60 Hz rejection The USB 1616HS 2 does not have open thermocouple detection Tips for making accurate temperature measurements Set the rejection frequency to equal the line frequency Warm up the USB 1616HS 2 for 60 minutes including TC wires so that it is thermally stabiliz
71. tr VO CH 6 HI 6H FIRSTPORTC Bit 6 C6 CH 6 LO 14L FIRSTPORTC Bit 7 C7 Analog common Aw Digital common Dw CH 7 HI 7H Counter 2 CT2 CH 7 LO 15L Counter 3 CT3 52 Declaration of Conformity Manufacturer IOTech Incorporated Address 2597 Cannon Road Cleveland OH 44146 USA Category Information technology equipment IOTech Incorporated declares under sole responsibility that the product USB 1616HS 2 to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents EU EMC Directive 89 336 EEC Electromagnetic Compatibility EN 61326 1997 Amendment 1 1998 Emissions Group 1 Class A EN 55022 1993 CISPR 22 Radiated and Conducted emissions Immunity EN61326 Annex A EC 61000 4 2 1995 Electrostatic Discharge immunity Criteria B JEC 61000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A EC 61000 4 4 1995 Electric Fast Transient Burst immunity Criteria A EC 61000 4 6 1996 Radio Frequency Common Mode immunity Criteria A TEC 61000 4 11 1994 Voltage Dips Interruption immunity To maintain the safety emission and immunity standards of this declaration the following conditions must be met The host computer peripheral equipment power sources and expansion hardware must be CE compliant Equipment must be operated in a controlled electromagnetic environme
72. trigger before stable mode Trigger after stable mode behaves more like a traditional debounce function rejecting glitches and only passing state transitions after a required period of stability Trigger after stable mode is used with electro mechanical devices like encoders and mechanical switches to reject switch bounce and disturbances due to a vibrating encoder that is not otherwise moving The debounce time should be set short enough to accept the desired input pulse but longer than the period of the undesired disturbance as shown in Figure 18 Debounce Time Trigger Before Stable Trigger After Stable Figure 18 Optimal debounce time for trigger after stable mode Encoder mode Rotary shaft encoders are frequently used with CNC equipment metal working machines packaging equipment elevators valve control systems and in a multitude of other applications in which rotary shafts are involved The USB 1616HS 2 supports quadrature encoders with up to 2 billion pulses per revolution 20 MHz input frequencies and x1 x2 x4 count modes The encoder mode allows the USB 1616HS 2 to make use of data from optical incremental quadrature encoders In encoder mode the USB 1616HS 2 accepts single ended inputs When reading phase A phase B and index Z signals the USB 1616HS 2 provides positioning direction and velocity data The USB 1616HS 2 can receive input from up to two encoders The USB 1616HS 2 supports
73. ts the signal on the mapped counter input to latch the count By default the start of scan signal a signal internal to the USB 1616HS 2 that pulses once every scan period to indicate the start of a scan group latches the count so that the count is updated each time a scan is started Gating on mode Sets the gating option to on for the mapped channel enabling the mapped channel to gate the counter Any counter can be gated by the mapped channel When the mapped channel is high the counter is enabled When the mapped channel is ow the counter is disabled but holds the count value The mapped channel can be any counter input channel other than the counter being gated Decrement on mode Sets the counter decrement option to on for the mapped channel The input channel for the counter increments the counter and you can use the mapped channel to decrement the counter Debounce modes Each channel s output can be debounced with 16 programmable debounce times from 500 ns to 25 5 ms The debounce circuitry eliminates switch induced transients typically associated with electro mechanical devices including relays proximity switches and encoders There are two debounce modes as well as a debounce bypass as shown in Figure 13 In addition the signal from the buffer can be inverted before it enters the debounce circuitry The inverter is used to make the input rising edge or falling edge sensitive Edge selection is available with
74. ure 31 Example of FIRSTPORTC or DAC latency By applying a setpoint on analog input channel 2 that setpoint gets evaluated every 10 us with respect to the sampled data for channel 2 Due to the pipelined architecture of the analog to digital converter system the setpoint cannot be evaluated until 2 us after the ADC conversion In the example above the FIRSTPORTC digital output port can be updated no sooner than 2 us after channel 2 has been sampled or 3 us after the start of the scan This 2 us delay is due to the pipelined ADC architecture The setpoint is evaluated 2 us after the ADC conversion and then FIRSTPORTC can be updated immediately The detection circuit works on data that is put into the acquisition stream at the scan rate This data is acquired according to the pre acquisition setup scan group scan period etc and returned to the PC Counters are latched into the acquisition stream at the beginning of every scan The actual counters may be counting much faster than the scan rate and therefore only every 10 100 or count shows up in the acquisition data As aresult you can set a small detection window on a totalizing counter channel and have the detection setpoint stepped over since the scan period was too long Even though the counter value stepped into and out of the detection window the actual values going back to the PC may not This is true no matter what mode the counter channel is in When setting a detection win
75. wo sample times are used to return the full 32 bit result Therefore a 32 bit counter can only be sampled at a 6 MHz maximum rate If you only want the upper 16 bits of a 32 bit counter then you can acquire that upper word at the 12 MHz rate The counter counts up and does not clear on every new sample However it does clear at the start of a new scan command 27 USB 1616HS 2 User s Guide Functional Details The counter rolls over on the 16 bit counter low boundary or on the 32 bit counter high boundary Clear on read mode The counter counts up and is cleared after each read By default the counter counts up and only clears the counter at the start of a new scan command The final value of the counter the value just before it was cleared is latched and returned to the USB 1616HS 2 Clear on read mode is only available if the counter is in asynchronous mode the The counter s lower 16 bit value should be read first This will latch the full 32 bit result and clear the counter The upper 16 bit value can be read after the lower 16 bit value Stop at the top mode The counter stops at the top of its count The top of the count is FFFF hex 65 535 for the 16 bit mode and FFFFFFFF hex 4 294 967 295 for the 32 bit mode 32 bit or 16 bit Sets the counter type to either 16 bits or 32 bits The type of counter only matters if the counter is using the stop at the top mode otherwise this option is ignored Latch on map Se
76. y upon arming the acquisition Using the setpoint status register You can use the setpoint status register to check the current state of the 16 possible setpoints In the register Setpoint O is the least significant bit and Setpoint 15 1s the most significant bit Each setpoint 1s assigned a value of 0 or 1 37 USB 1616HS 2 User s Guide Functional Details value of 0 indicates that the setpoint criteria are not met in other words the condition is False A value of 1 indicates that the criteria have been met in other words the condition is True In the following example the criteria for setpoints 0 1 and 4 is satisfied True but the criteria for the other 13 setpoints has not been met Setpoint 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 True 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 False 0 lt lt lt Most significant bit Least significant bit gt gt gt From the table above we have 10011 binary or 19 decimal derived as follows Setpoint 0 having a True state shows 1 giving us decimal 1 Setpoint 1 having a True state shows 1 giving us decimal 2 Setpoint 4 having a True state shows 1 giving us decimal 16 For proper operation the setpoint status register must be the last channel in the scan list Examples of control outputs Detecting on analog input DAC and FIRSTPORTC updates Update mode Update on True and False Criteria Chan

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