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USB-1616HS-BNC User's Guide - from Measurement Computing

1. 12 Port B B4 Digital 1 O digital port B bit 4 13 Port B B6 Digital 1 O digital port B bit 6 14 DGND Digital common 15 Port A AO Digital 1 O digital port A bit O 16 Port A A2 Digital 1 O digital port A bit 2 17 Port A A4 Digital 1 O digital port A bit 4 18 Port A A6 Digital I O digital port A bit 6 19 DGND Digital common 20 SGND Signal Ground 21 DAC1 Digital to analog converter analog output 1 22 AGND Analog common 23 5VDC 5 VDC power out 24 XPACR A D pacer clock I O 25 DGND Digital common 26 CTR3 Counter input CTR3 27 CTR1 Counter input CTR1 28 DGND Digital common 29 Port B B1 Digital 1 O digital port B bit 1 30 Port B B3 Digital I O digital port B bit 3 31 Port B B5 Digital 1 O digital port B bit 5 32 Port B B7 Digital 1 O digital port B bit 7 33 DGND Digital common 34 Port A A1 Digital I O digital port A bit 1 35 Port A A3 Digital 1 O digital port A bit 3 36 Port A A5 Digital I O digital port A bit 5 37 Port A A7 Digital I O digital port A bit 7 12 USB 1616HS BNC User s Guide Installing the USB 1616HS BNC Cabling Use a C37FM x 37 pin cable to connect to the USB 1616HS BNC s 37 pin device I O connector The red stripe identifies pin 1 A Female connector Male connector Figure 1 C37FM x cable Field wiring and signal termination accessories You can connect the USB 1616HS BNC to the following acce
2. 0 01 Coupling DC Update rate 1 MHz maximum resolution 20 83 ns Settling time 2 us to rated accuracy 10 V step Pacer sources Three programmable sources Onboard output scan clock independent of input scan clock Onboard input scan clock External input scan clock XAPCR Trigger sources Start of input scan 42 USB 1616HS BNC User s Guide Specifications Digital input output Table 4 Digital input output specifications Number of I O 16 Ports Two 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 Q 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 Digital input pacing Onboard input scan clock external input scan clock XAPCR Digital output pacing Three programmable sources Onboard output scan clock independent of input scan clock Onboard input scan clock External input scan clock XAPCR Digital input trigger sources and modes See Table 7
3. USB 1616HS BNC User s Guide Specifications Accuracy Table 2 Analog input accuracy specifications Voltage range Accuracy Temperature coefficient Noise cts 1 of reading ppm 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 5V to5 V 0 031 0 009 14 9 3 0 2Vto2V 0 031 0 010 14 10 2 0 1Vto1V Note 1 0 031 0 02 14 12 3 5 Note 2 500 mV to 500 mV 0 031 0 04 14 18 5 5 200 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 Note 1 Specifications assume 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 Noise reflects 10 000 samples at 1 MHz typical differential short 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 3 Analog output specifications Channels 2 Resolution 16 bits Data buffer PC based memory Output voltage range 10 V Output current 1 mA Offset error 0 0045 V maximum Digital feed through lt 10 mV when updated DAC analog glitch lt 12 mV typical at major carry Gain error
4. chapter on page 41 of this user s guide to make sure that the input signals do not exceed the specified limits Connect the analog inputs to the BNC connectors on the front panel of the USB 1616HS BNC Connect the TR 2U external supply or another compatible 6 16 VDC power supply to the USB 1616HS BNC s external power connector and plug the other end into a power outlet The USB 1616HS BNC requires 9 V of external power Connect the USB cable to the USB 1616HS BNC USB connector and to a USB port on your computer A USB2 0 port is recommended connecting to a USB1 1 port results in lower performance When you connect the USB 1616HS BNC for the first time a Found New Hardware message opens as the USB 1616HS BNC 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 if properly detected If not check if the USB 1616HS BNC has sufficient power When the device 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 BNC or you may lose data and or your ability to communicate with the USB 1616HS BNC Configuring the hardware All hardware configuration options on the USB 1616HS BNC are software controlled You can select some of the configuration options using
5. Hysteresis mode forced update If X gt A is True then output value 2 until X lt B is True then output value 1 IfX lt Bis True then output value 1 until X gt A is True then Above A X gt A i output value 2 a Below A lt X lt B Both a hysteresis af This is saying conditions are checked when A 2 i y i mode a If the input signal is outside the window high output value 2 until in hysteresis mode A 3 ig 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 Detect2 Detect3 Acquisition stream Scan Group i Ch 1 2 3 4 etc Scan Figure 22 Example diagram of detection signals for channels 1 2 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 BNC 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 det
6. JnstaCal such as the edge used for pacing when using an external clock 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 connectors 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 BNC 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 USB 1616HS BNC User s Guide Installing the USB 1616HS BNC Connecting the board for I O operations Connectors cables main I O connector The following table lists the board I O connector type
7. compatible cables and compatible accessory products for the USB 1616HS BNC Board connectors cables and accessory equipment Main connectors 16 standard BNC female connectors for analog input The shell of the BNC is the low differential input and the center conductor is the high differential input 37 pin DSUB female connector DSUB37F connector for digital I O counter encoder inputs timer output and analog output pin DSUB connector Compatible cable for the 37 C37FM x see Figure 1 x 1 2 3 4 5 10 15 20 25 or 50 foot lengths Compatible accessory products CIO MINI37 CIO MINI37 VERT CIO TERMINAL SCB 37 Refer to the Field wiring and signal termination accessories section on page 13 for descriptions of these compatible accessory products DSUB37F connector Pin number Name Description 1 SELFCAL Self calibration Factory use only Do not connect 2 DACO Digital to analog converter analog output 0 3 AGND Analog common 4 TMR1 Timer output 1 16 bit frequency pulse generator output 5 DGND Digital common 6 TMRO Timer output 0 16 bit frequency pulse generator output 7 TTLTRG TTL trigger input 8 CTR2 Counter input CTR2 9 CTRO Counter input CTRO 10 Port B BO Digital 1 O digital port B bit O 11 Port B B2 Digital I O digital port B bit 2
8. inputs When reading phase A phase B and index Z signals the USB 1616HS BNC provides positioning direction and velocity data The USB 1616HS BNC can receive input from up to two encoders The USB 1616HS BNC supports 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 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 co
9. result of setpoints applied to analog or digital inputs 30 USB 1616HS BNC User s Guide Functional Details Using detection setpoints for output control What are detection setpoints With the USB 1616HS BNC s setpoint configuration feature you can configure up to 16 detection setpoints associated with channels in a scan group Each setpoint can update the following allowing for real time control based on acquisition data analog outputs DACs timers Setpoint configuration 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 output designated as Output 1 Detect Rising Edge Detect Falling Edge Condition True Condition False Channel AFP I Input Criteria Condition Figure 21 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 gen
10. 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 idas leia ade cani 7 What you will learn from this user s guide oooonocinccoocnoonoonononononconoconoco nono ennen renere ener rener retn renerne sneg 7 Conventions used in this user s guide ooooonoccnoccnococononononnnonncnonono nono no nono nono nrnnnrnn renerne renen rener rr nn rr reen renee 7 Where to find more information ooooccocnnonononononcnononnnonn nono non ono n ron n rs rer non r nn RR nn RR an renere renen renerne renerne 7 Chapter 1 Introducing the USB 1616HS BNC Guss 8 Overview USB 1616HS BNC features rr nono nono nn cn nr nn nr hen i Oa Aa AE P AS 8 Software features e ee eto elena ed o tes e e en ee 8 Chapter 2 Installing the USB 1616HS BNC r a eaea a aea ae naaa eaa aa nara aeea rra acces 9 What comes with your USB 1616HS BNC shipment u sssssereereerer rener reen sn serene renere renerne ennen 9 Hardware nt o a MN Ae a Nee KE NA eek eae 9 Optional components Heese sess ead ach ula thsi NO 10 Additional documentations cc cics cesccsdesidessdsscvecevecencossecencessessdvacsacsbeensechconsesecsadecedsantace tentestacvadesaaceeuedeiden dec
11. 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 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 1s 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 Set the 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
12. 16 bit frequency pulse generator output 5 DGND Digital common 6 TMRO Timer output 0 16 bit frequency pulse generator output 7 TILTRG TTL trigger input 8 CTR2 Counter input CTR2 9 CTRO Counter input CTRO 10 Port B BO Digital I O digital port B bit O 11 Port B B2 Digital I O digital port B bit 2 12 Port B B4 Digital I O digital port B bit 4 13 Port B B6 Digital I O digital port B bit 6 14 DGND Digital common 15 Port A AO Digital I O digital port A bit O 16 Port A A2 Digital I O digital port A bit 2 17 Port A A4 Digital I O digital port A bit 4 18 Port A A6 Digital I O digital port A bit 6 19 DGND Digital common 20 SGND Signal Ground 21 DAC1 Digital to analog converter analog output 1 22 AGND Analog common 23 5VDC 5 VDC power out 24 XPACR A D Pacer clock I O 25 DGND Digital common 26 CTR3 Counter input CTR3 27 CTR1 Counter input CTR1 28 DGND Digital common 29 Port B B1 Digital I O digital port B bit 1 30 Port B B3 Digital I O digital port B bit 3 31 Port B B5 Digital I O digital port B bit 5 32 Port B B7 Digital I O digital port B bit 7 33 DGND Digital common 34 Port A A1 Digital I O digital port A bit 1 35 Port A A3 Digital I O digital port A bit 3 36 Port A A5 Digital I O digital port A bit 5 37 Port A A7 Digital I O digital port A bit 7 47 cE Declaration of Conformity Manufacturer IOTech I
13. 17 for more information In both modes adding digital input scans has no affect on the analog scan rate limitations If no analog inputs are being 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 19 USB 1616HS BNC User s Guide Functional Details Digital outputs and pattern generation Digital outputs can be updated asynchronously at any time before during or after an acquisition You can use both 8 bit ports to generate a digital pattern at up to 4 MHz The USB 1616HS BNC supports digital pattern generation 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 1 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 BNC supports the following trigger modes to accommodate certain measurement situations Hardware analog triggering The USB 1616HS BNC 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
14. 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 a timer output instead of a DAC Channel 3 analog input voltage PI N Limit 4 Limit B Detection DACO Figure 26 Channel 3 in hysteresis mode 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 DAC1 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 DAC1 will be updated with 3 0 V Analog input Channel 7 also has an inside the window setpoint applied Whenever channel 7 s input goes inside the programmed window DAC1 is updated with 7 0 V 36 USB 1616HS BNC User s Guide Functional Details Limit A for channel 3 Limit B for channel 3 Limit for channel 7 f Limit B for channel 7 Detection channel 3 Detection channel 7 lA A Ti fij Start of acquisition 3 0V Denotes DAC update DAC1 0 0 V 70W Figure 27 Using two criteria to control an output The update on True only mode was selected and therefore the updates for
15. DAC1 only occur when the criteria is 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 DAC1 voltage is associated with the criteria that has been most recently met Detecting setpoints on a totalizing counter In the following figure Channel is a counter in totalize mode Two setpoints define a point of change for Detect 1 as the counter counts upward The detect output is 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 You could update DACO on a True condition the rising edge of the detection signal Alternately you could update one of the timer outputs with a value FEE A eee 65535 At this point you can update a DAC or a timer output Limit 4 Limit B Logical output Detection Figure 28 Channel 1 in totalizing counter mode inside the window setpoint 37 USB 1616HS BNC User s Guide Functional Details Detection setpoint details Controlling analog and timer outputs 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 upd
16. 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 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 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 BNC 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 Sixteen TTL level digital I O lines are included in each USB 1616HS BNC 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 Sampling digital inputs for every analog sample in a scan group on page
17. Digital output trigger sources Start of input scan Sampling update rate 4 MHz maximum rates up to 12 MHz are sustainable on some platforms Pattern generation output Both 8 bit ports can be configured to support 16 bit pattern generation The pattern can also be updated synchronously with an acquisition at up to 4 MHz Counters Counter inputs can be scanned based on an internal programmable timer or an external clock source Table 5 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 XAPCR Trigger sources and modes See Table 7 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 43 USB 1616HS BNC User s Guide Specifications Input sequencer Analog digital and counter inputs can be scanned based on either an internal programmable timer or an external clock s
18. USB 1616HS BNC USB based High speed Analog I O and Digital I O Module User s Guide MEASUREMENT COMPUTING USB 1616HS BNC User s Guide A D MEASUREMENT COMPUTING Document Revision 1 May 2008 O Copyright 2008 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 Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For spe
19. Y tesoreria nadando tiesto idearon ceva Eea rose Analog Outputs A A A ee e Digital input output CU a A A A a SEE SEERE eee A A NN External acquisition scan Clock cc ccss cicsesseccscessacenestdascaed cn stvece d nde docencia cecustessacsbees Coctiecdduscescd on cavace dessbent destDesedaceeed 44 Triggering Freque cy pulse penetrada feist det n e e Hii Se A oe ENES ER 45 Power CONSUMPTION E E E A 45 External A ralla 45 USB specifications a asia 46 Environmental cr il tia ii 46 Mechanical ira te os ta to lo ie oo le o le 46 Signal I O connectors and pin out cececeesecsseeseeeseeeeeessceeceseceseceecaecsaecaaecsaecseecseeeaeeeaeseeeeeeeesnseseaeeeaeenaeenaes 46 Declaration Of Conformity lt 2 05 22 ceiecdecienetedeecncedeecedacceeecaacdeesedeccdeecaandecs AA AAAA TSAA TARTANE TARER ERATA EEEN 48 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 BNC so that you get the most out of its analog I O digital I O and 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 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 yo
20. an 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 15 analog input voltage is inside the setpoint window condition True Timer0 is updated with one value and whenever the channel 15 analog input voltage is outside the setpoint window condition False timer0 will be updated with a second output value P Ch 15 analog input voltage Limit A for Channel 15 Limit B for Channel 15 Detection Signal TimerO Figure 25 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 35 USB 1616HS BNC User s Guide Functional Details Criteria used Window criteria for above and below the set limits Figure 26 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
21. 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 BNC has an onboard 1 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 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 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 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 ei
22. aq 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 BNC What comes with your USB 1616HS BNC shipment As you unpack your USB 1616HS BNC verify that the following components are included Hardware USB 1616HS BNC 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 BNC s European customers Contact Measurement Computing to order the CA 261 line cord for your region USB 1616HS BNC User s Guide Installing the USB 1616HS BNC Optional components If you ordered any of the following products with your USB 1616HS BNC they should be included with your shipment Cables lt C37FM x cable Signal conditioning accessories Measurement Computing provides signal termination products for use with the USB 1616HS BNC Refer to the Field wiring and signal termination accessories section on page 13 for a complete list of compatible accessory products Additional documentation In addition to this hardware user s guide you should also receive the Quick Start Guide available in PDF at www mcecdag com PDFmanuals DA Q Software Quick Start pdf T
23. ate values Each update value can drive one DAC or one timer 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 or timer outputs Analog outputs have a 3us delay before updating due to the shifting of the digital data out to the D A converter which takes 1 us plus the actual conversion time of the D A converter another 2 us at worst Going back to the above example the setpoint for analog input Channel 2 s DAC update would occur 5us after the ADC conversion for Channel 2 or 6 us 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 DAC or timer update latency Setpoints allow analog output DACs or timers 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 For example you set an acquisition t
24. 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 Analog input The USB 1616HS BNC has a 16 bit 1 MHz A D coupled with 16 differential analog inputs Seven software programmable ranges provide inputs from 10 V to 100 mV full scale Analog input scanning The USB 1616HS BNC 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 15 USB 1616HS BNC User s Guide Functional Details 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 applications leave the settling time at its default of 1 us 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 tha
25. ce 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 BNC onboard 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 InstaCal and without the use of external hardware or instruments Field calibration derives its traceability through an onboard reference which has a stability of 0 005 per year Note that a two year calibration period is recommended for USB 1616HS BNC boards You should calibrate the USB 1616HS BNC 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 40 Chapter 5 Specifications Typical for 25 C unless otherwise specified Specifications in talic text are guaranteed by design Analog input Tabl
26. cific information please refer to the terms and conditions of sale Harsh Environment Warranty Program Any Measurement Computing product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current list price I O boards face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned within 30 days of purchase for a full refund of the price paid for the product being returned If you are not satisfied or chose the wrong product by mistake you do not have to keep it These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising from the use of its products even if Measurement Computing Corporation has been notified in advance of the possibility of such damages HM USB 1616HS BNC doc 3 Trademark and Copyright Information TracerDAQ Universal Library Harsh Environment Warranty Measurement Computing Corporation and the Measurement Computing logo are either
27. ck input signal range Logical zero 0 V to 1 0 V Logical one 2 3 V to 5 0 V Input pulled up to 3 3 V through 2 47 kQ Output Minimum pulse width 50 ns high 50 ns low Clock output signal range Logical one 137 Q to 3 3 V Logical zero 130 Q to ground Output pulse width 42 ns high occurs on every rising edge of the internal pacer clock 44 USB 1616HS BNC User s Guide Specifications Triggering Table 7 Trigger sources and modes Trigger source 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 can be selected as the software trigger channel Input signal range Anywhere within range of the trigger channel Trigger level Programmable 16 bit resolution Latency One scan period maximum Single channel digital trigger A separate digital input is provided for digital triggering TTLTRG 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 ma
28. coder s power input to the external power source Connect the return to digital common GND on the same source 29 USB 1616HS BNC User s Guide Functional Details 5VDC pin 23 is DGND pin 5 CTRO pin 9 CTRA pin 27 CTR2 pin 8 CTR3 pin 26 To Encoder 1 A To Encoder 1 B To Encoder 2 A To Encoder 2 B ENCODER ENCODER Other DGND pins pins 14 25 28 or 33 can also be used Figure 19 Two encoders connected to DSUB37 pins on the USB 1616HS BNC Timer outputs Two 16 bit timer outputs are built into every USB 1616HS BNC Each timer output can generate a different square wave with a programmable frequency in the range of 16 Hz to 1 MHz 3 3V DB 37 connector Timer Generator 100 Q Figure 20 Typical USB 1616HS BNC timer channel Example Timer outputs Timer outputs are programmable square waves The period of the square wave can be as short as 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 Both timer outputs can also be updated during an acquisition as the
29. e 1 Analog input specifications A D converter type Successive approximation Resolution 16 bits Number of channels 16 differential Input ranges software and sequencer programmable Bipolar 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V Maximum sample rate 1 MHz Nonlinearity integral 2 LSB maximum Nonlinearity differential 1 LSB maximum A D pacing Onboard input scan clock external source XAPCR Trigger sources and modes See Table 7 Acquisition data buffer 1 MSample Configuration memory Programmable I O Maximum usable input voltage common mode Range 10 V 5 V 2 V 1 V 10 5 V maximum voltage CMV Vin 0 5 V 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 C to 35 C Crosstalk 75 dB typical DC to 60 Hz 65 dB typical 10 kHz Input impedance 20 MQ differential Absolute maximum input voltage 30V Maximum usable input voltage common mode Ranges Maximum CMV Vin voltage 5 10 V 10 5 V 0 1 0 2 0 5 1 2 V 6 0 V 41
30. e 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 12 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 13 Mechanical specifications Vibration MIL STD 810E category 1 and 10 Dimensions 280 mm W x 216 mm D x 45 mm H 11 0 x 8 5 x 1 75 Weight 1 39 kg 3 06 lbs Signal I O connectors and pin out Table 14 Screw connector specifications Connector type Analog inputs 16 standard BNC female connectors for analog input Center conductor is high shell is low DIO AO CTR Timer 37 pin DSUB See Table 15 Compatible cables C37FM x x length in feet Compatible SCB 37 accessories CIO MINI37 CIO MINI37 VERT CIO TERMINAL 46 USB 1616HS BNC User s Guide Specifications Table 15 USB 1616HS BNC 37 pin DSUB connector pin out Pin number Name Description 1 SELFCAL Self calibration Factory use only Do not connect 2 DACO Digital to analog converter analog output 0 3 AGND Analog common 4 TMR1 Timer output 1
31. ection setpoint for the counter s lower 16 bit value and one detection setpoint for the counter s higher 16 bit value 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 Jimit 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 BNC through software 32 USB 1616HS BNC User s Guide Functional Details Set low limit You can set the 16 bit low limit limit B when configuring the USB 1616HS BNC 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 Signal 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 dig
32. erates 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 is 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 is False 0 when the channel s data does not meet the setpoint criteria The True and False states for each setpoint criteria are explained in the Using the setpoint status register section on page 33 Criteria input signal is equal to X Action driven by condition Compare X to Setpoint definition choose Update conditions one True only Equal to A X A If True then output value 1 Limit A or Below A X lt A If False then perform no action Limit B Above B X gt B True and False If True then output value 1 If False then output value 2 True only Window i If True then output value 1 i non hysteresis 7 Inside B lt X lt A If False then perform no action mode Outside B gt X or X gt A True and False If True then output value 1 If False then output value 2 31 USB 1616HS BNC User s Guide Functional Details Criteria input signal is equal to X Action driven by condition Compare X to Setpoint definition choose Update conditions one
33. etects the trigger condition which may be thousands of readings after the actual occurrence of the signal the USB 1616HS BNC driver automatically 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 BNC 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 21 USB 1616HS BNC User s Guide Functional Details No pre trigger infinite post trigger In this mode no pre trigger data
34. eteendesdbeeasecebes 10 Unpacking the USB 1616HS BNG e a A ES 10 Installing the software Installing the hard Ware tds 11 Configuring the hard Wat ia E E Else 11 Connecting the board for I O operations ooooconnoonncnnocnnonconnconocononnnoonncon nono nere ennen ene renere n rro nr onn ran ran rran ninia 12 Connectors cables main I O connector oooooconocccononcnononcnonononoconnnenonanonconnnnocnonnnnoonnenonnnnnccnnnnnnonnnnronnn nro non nn nron mencionan nccnnanos 12 DSUB3 TE Connectors eaa notice EA idad ei ou utente dd SA aso Diao 12 Cabling Field wiring and signal termination accessories ooooccnnonccicnononncononnnonononncononncn nono nn nono nn tetun terrere none one n nan an none ennen 13 Chapter 3 FUNctONal Detalla USB 1616HS BNC components USB 1616HS BNC block diagram Synchronous I O mixing analog digital and counter scanning ooooccocccccononononanononnnononnconononononnnonn cn ncnncnncnncnnos 15 Analog MP til a 15 Analog input scanning veria ida eve ETOS EES En trade 15 ATIAlOB OULPUE ato ar aio clan Example Analog channel scanning of voltage inputs and streaming analog outputs DIS K O RR E da a e o ns Rae e eat ect od Md Digital mp ut SCA E A A A A A a ARE Digital outputs and pattern generations cessisse anii easair Sea EE i TEESE i E EA TETE AS EEEE TALA etai mnnn an AA e a ea a a i ee ee en ti Hardware analog triggering Digital E id ti id lied is A NN Stop trigger modes Pre triggerin
35. f 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 BNC User s Guide this document is also available on our web site at www mcecdag com PDFmanuals USB 1616HS BNC pdf Chapter 1 Introducing the USB 1616HS BNC Overview USB 1616HS BNC features The USB 1616HS BNC is supported under popular Microsoft Windows operating systems The USB 1616HS BNC board is a multifunction measurement and control board designed for the USB bus Through its front panel BNC connectors the USB 1616HS BNC provides 16 differential 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 1 V Through its 37 pin DSUB connectors the USB 1616HS BNC provides two 16 bit 1 MHz analog output channels with an output range of 10 V to 10 V 16 high speed lines of digital I O two timer outputs four 32 bit counters The USB 1616HS BNC provides up to 4 MHz scanning on all digital input lines You can operate all analog I O digital I O and counter timer I O synchronously Software features For information on the features of JnstaCal and the other software included with your USB 1616HS BNC refer to the Quick Start Guide that shipped with your device The Quick Start Guide is also available in PDF at www meccd
36. g and post triggering modes 00 0 eee eeeeseeeseceseeecseeseceesesecsaesecnevsccsessececsaesecnevsecaeaececsaesecnasaesaeeaeteesaeeeens Counter inputs ii a iaa ceda Tips for making high speed counter measurements gt 1 MHZ cceseesesscessceseeseeeecesecececseesecaecaaecseeeeaecaecseeeeeeaeeeaeeea EA AN Counter modes DEDO CM aan o ioar te Ea EA EEE AENEA TOKEA ESADE ESETE EA NE ED EEEE ONEA ESEE EN OEE E SE EN EES USB 1616HS BNC User s Guide LUPUS ee e a e e e e 30 Example Timer O0 pUtS siria le dl dica dadas eeh tes dica seedede dido debito dore deci Ta 30 Using detection setpoints for output CONE ee ceeceseceseesseeseeeseeseceeeeeecesecnsecesecsaecsaecaaecaeecaeeeaeeeseeeeeeereeetens 31 What are detection setpoints u u u sssss essere eerene serene renen conc conc cnnonncnnncn nono RO OE 31 Setpoint configuration OVeErvie Wii ln dead 31 Setpoint configuration airecicocinnncini nicano des cocevesdascceccden cutee oia ad da Nada saceudescecutlcssdascbsad cu se ecesldeutesdesttonsdesdbusd on A 32 Using the setpoint Status r sister toria ide elas 33 Examples of control Outta id ie oi dh Arns N A 34 D tection setpoint details 52 IA A A dee eta 38 DAC ortimer update latency nuit A da ista 38 Chapter 4 Calibrating the USB 1616HS BNC ooomoocccccccconccoonccccnccnnnnnnonnnnncnnnnnnnnne nene ne nn nnnnnn nn nene nena nnnn naa ncn nenes 40 Chapter 5 Specifications An e do e ee dd a del ACCULAC
37. his booklet supplies a brief description of the software you received with your USB 1616HS BNC and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB 1616HS BNC As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB 1616HS BNC 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 mccdag com PDFmanuals DAQ Software Quick Start pdf We recommend that you download the latest Windows Update onto your computer before installing and operating the USB 1616HS BNC 10 USB 1616HS BNC User s Guide Installing the USB 1616HS BNC Installing the hardware To connect the USB 1616HS BNC to your system turn your computer on and then do the following Refer to the Specifications
38. 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 Y ou set the amount 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 BNC Each counter accepts frequency inputs up to 20 MHz USB 1616HS BNC 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 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 DB 37 Counter connector 200 Q Figure 9 Typical USB 1616HS BNC 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 tolera
39. is 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 two 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 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 BNC 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 bit
40. ital 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 is running in hysteresis mode Set output channel None Update DAC Update timerx Update modes Update on True only Update on True and False Set values for output 16 bit DAC value or timer value when input meets criteria 16 bit DAC value or timer value when does not meet criteria When using setpoints with triggers other than immediate hardware analog or TLL the setpoint criteria evaluation begins immediately 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 0 is the least significant bit and Setpoint 15 is the most significant bit Each setpoint is assigned a value of 0 or 1 A value of 0 indicates that the setpoint criteria are not met in other words the condition is False 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 setpoin
41. l power connector Two LED indicators Active and Power pi TO pad CH7 JOR Ql 3 PRECE on ss one SN TO e OPORTO on Gon Figure 2 USB 1616HS BNC components front view DEVICE I O DC IN ps OB sas X POWER 6 16 VDC 1 A MAX Figure 3 USB 1616HS BNC components rear view External power connector DC IN The USB 1616HS BNC requires external power Connect the TR 2U power supply to the external power supply connector This power supply provides 9 VDC power to the USB 1616HS BNC 14 USB 1616HS BNC User s Guide Functional Details USB 1616HS BNC block diagram Figure 4 shows a simplified block diagram of the USB 1616HS BNC This device provides all of the functional elements shown in the figure Analog Channel Input Protection One TTL Trigger Input One y Analog Trigger Pacer Clock f Two 16 Bit Timer Outputs Four 32 Bit Counter Inputs 5 Two 8 Bit Digital 10 Ports Front Panel 0 0 0 0 Lo oJ o 000 o Mo oJ Figure 4 USB 1616HS BNC functional block diagram Synchronous I O mixing analog digital and counter scanning The USB 1616HS BNC can read analog digital and counter inputs while generating up to 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
42. lowing time periods T1 through T6 pertain to the above drawing T1 In the illustrated example the input signal is low for the debounce time equal to T1 therefore when the input edge arrives 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 T1 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 T1 meeting the debounce requirement The output is held at the high state This is the same state as the input T4 At anytime during time period T4 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 T5 During time period TS 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 25 USB 1616HS BNC User s Guide Functional Detail
43. ment may exhibit noise or increased offsets when exposed to high RF fields gt 3 V m or transients Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in February 2008 Test records are outlined in Chomerics Test Report EMI4958 08 We hereby declare that the equipment specified conforms to the above Directives and Standards 0 Hope Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com
44. ncorporated Address 25971 Cannon Road Cleveland OH 44146 USA IOTech Incorporated declares under sole responsibility that the product USB 1616HS BNC to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents Category Information Technology Equipment EC EMC Directive 89 336 EEC Electromagnetic Compatibility EN 55022 1995 with A1 2001 and A2 2003 and EN 55024 1998 Emissions Class B Radiated and Conducted emissions EN 55022 1995 With A1 2001 and A2 2003 Immunity EN 55024 1998 TEC 61000 4 2 1995 Electrostatic Discharge immunity Criteria A TEC 61000 4 3 1997 Radiated Electromagnetic Field immunity Criteria A IEC 61000 4 4 1995 Electric Fast Transient Burst immunity Criteria B IEC 61000 4 6 1996 Radio Frequency Common Mode immunity Criteria B IEC 61000 4 11 1994 Voltage Dips Interruption immunity Criteria B 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 I O cables must be less than 3 meters 9 75 feet in length and shielded with the shields connected to the USB 1616HS BNC chassis This connection is to be made via the jack screws of the Digital I O connector located on the rear panel A TR 2U power supply must be used Note Data acquisition equip
45. noise is reduced or eliminated by averaging Averaging does not reduce or eliminate periodic signals Analog output The USB 1616HS BNC 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 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 input scan clock A user supplied external input scan clock at XPCR 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 8 adds two DACs and a 16 bit digital pattern output to the example presented in Figure 5 on page 16 18 USB 1616HS BNC User s Guide Functional Details Start of scan Start of scan Start of scan Start of scan 0 1 3 4 6 7 of1 3 4 6 7 0 1 3 4 6 7 0 11 3 4 6 7 1 l E Scan period DACO DACI D16 DACr Figure 8 Analog channel scan of voltage inputs and streaming analog outputs example This example updates all
46. nt parallel terminate the coax or twisted pair with a 50 Q or 100 Q resistor at the terminal block The amplitude of the driving waveform should 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 22 USB 1616HS BNC User s Guide Functional Details 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 th
47. o 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 t 1 2T3T4T ST 6 1 2 314 516 hips os la 10s Start of Scan Start of Scan DACO Figure 29 Example of 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 38 USB 1616HS BNC User s Guide Functional Details Due to the pipelined architecture of the analog to digital converter system the setpoint cannot be evaluated until 2 us after the ADC conversion Analog outputs have a 3us delay due to the shifting of the digital data out to the D A converter which takes 1 us plus the actual conversion time of the D A converter another 2 us worst case Going back to the above example if the setpoint for analog input Channel 2 required a DAC update it would occur 5us after the ADC conversion for Channel 2 or 6 us after the start of the scan When using setpoints to control any of the DAC outputs latencies may increase 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 DAC pacer clock For these reasons avoid streaming output
48. ockwise 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 control as well as distance from the reference 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 28 USB 1616HS BNC User s Guide Functional Details Connecting the USB 1616HS BNC to an encoder You can use up to two encoders with each USB 1616HS BNC 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 BNC Connect each encoder ground to GND 5 V to power encoders is available from the DB37 connector You can also connect external pull up resistors to the USB 1616HS BNC counter inputs 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 o
49. og 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 1 second The maximum scan frequency is one divided by 6 us or 166 666 Hz USB 1616HS BNC User s Guide Functional Details Start of Scan Start of Scan Start of Scan Start of Scan a 4 4 C2 c2 c2 c2 ci ci ci C1 co co co co 0 2 5111 1305 0 2 5111 1305 ol2 5 1h3h5 0 2 5111 0305 tus Scan Period Figure 6 Analog and digital scanning once per scan mode example 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
50. ource Table 6 Input sequencer specifications Input scan clock sources two see Note 3 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 XAPCR 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 XAPCR Analog 1 0 MHz maximum 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 3 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 External acquisition scan clock Pin name XAPCR Pin type Bidirectional Input Maximum rate Analog 990 kHz Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled Clo
51. own in the following diagram Debounce Time o Input E IIl HLL Trigger Before Stable Trigger After Stable Figure 14 Optimal debounce time for 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 15 26 USB 1616HS BNC User s Guide Functional Details Debounce Time Trigger Before Stable f l Trigger After Stable l f Figure 15 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 BNC 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 BNC to make use of data from optical incremental quadrature encoders In encoder mode the USB 1616HS BNC accepts single ended
52. quired 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 T1 In the example above the input signal goes high at the beginning of time period T1 but never stays high for a period of time equal to the debounce time setting equal to T2 for this example T2 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 T5 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 Figure 12 Debounce module Trigger before stable mode The fol
53. s Debounce mode comparisons Figure 13 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 bypass option to achieve maximum glitch recognition Debounce Debounce Debounce i Time Time Time 1 r Input l Trigger Before Stable Trigger After Stable Poy 1 Figure 13 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 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 sh
54. s on any DAC or pattern digital output when using setpoints to control DACs 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 n count shows up in the acquisition data As a result 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 window 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 combination of both solutions 1 and 2 could be made 39 Chapter 4 Calibrating the USB 1616HS BNC Every range of a USB 1616HS BNC devi
55. s 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 Sets 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 BNC 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 23 USB 1616HS BNC User s Guide Functional Details 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 by default If the mapped counter is configured for falling edge the gated counter is disabled when the mapped counter is high When the mapped channel is low 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 incl
56. ssory boards using the C37FM x cable CIO MINI37 37 pin screw terminal board Details on this product are available on our web site at www mcecdaq com cbicatalog cbiproduct asp dept_id 102 amp pf_id 255 CIO MINI37 VERT 37 pin screw terminal board with vertical 37 pin male D connector Details on this product are available on our web site at www mecdag com cbicatalog cbiproduct asp dept_id l02 amp pf_id 256 CIO TERMINAL 37 pin screw terminal board with on board prototyping area Details on this product are available on our web site at www mccdagq com cbicatalog cbiproduct asp dept_id 102 amp pf_id 282 SCB 37 37 conductor shielded signal connection screw terminal box Details on this product are available on our web site at www mccdaq com cbicatalog cbiproduct asp dept_id 196 amp pf_id 1166 Chapter 3 Functional Details This chapter contains detailed information on all of the features available from the board including a diagram and explanations of physical board components a 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 BNC components These USB 1616HS BNC components are shown in Figure 2 and Figure 3 16 BNC connectors for voltage measurement One 37 pin DSUB connector for digital I O counter encoder inputs timer output and analog output One USB port One externa
57. t increasing the settling time reduces the maximum acquisition rate You can set the settling time to 1 us 5 us 10 us or 1 ms Example Analog channel scanning of voltage inputs Figure 5 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 us up to 1 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 o 1 3 4 6 7 0 113 4 67 0 1 3 4 6 7 olila 4 6 7 1 ps Scan Period Figure 5 Analog channel scan of voltage 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 making the minimum scan period for this example 7 x 256 us or 1792 us The maximum scan frequency is the inverse of this number 558 Hz 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 anal
58. the between limit A and window update DAC1 with the Output Value of 1 0 V limit B for channel 4 False When the above stated condition is False channel 4 analog input voltage is outside the window update DAC with the Output Value of 0 0 V In the channel 5 example below the setpoint placed on analog Channel 5 updates DAC1 with 0 0 V The update occurs when channel 5 s input is less than the setpoint limit A When the value of channel 5 s input is above setpoint limit A the condition of lt A is false and DACI is then updated with 1 0 V Channel 5 analog input voltage Nh Limit 4 for channel 5 Figure 23 Example 1 Analog inputs with setpoints update on True and False In the channel 4 example below you can program control outputs on each setpoint and use the detection for channel 4 to update DAC1 with 1 0 V when the analog input voltage is within the shaded region and a different value 0 0 V when the analog input voltage is outside the shaded region 34 USB 1616HS BNC User s Guide Functional Details 32767 Lint A for Channal 4 Limk B for Channel 4 Ch 4 Analog Input Voltage es e lt 10V _ 0 0V tf kl JT E for Channel 4 Figure 24 Example 2 Analog inputs with setpoints update on True and False Detection on an analog input timer output updates Update Mode Update on True and False Criteria Used Inside window Figure 25 shows how a setpoint c
59. ther Start of Scan Start of Scan Start of Scan Start of Scan C2 c2 C1 C1 C1 C1 co co co co gt DD D op D Pejo fof Agora ARA 012 5 11 1315 012 5 11 13 15 0 12 5 11 1315 0 2 5 11 13115 tus a i Sean Period Figure 7 Analog and digital scanning once per scan mode example USB 1616HS BNC User s Guide Functional Details 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 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 BNC has an onboard 1 MS buffer for acquired data 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 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
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61. ts 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 ds 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 33 USB 1616HS BNC User s Guide Functional Details Examples of control outputs Detecting on analog input and DAC updates Update mode Update on True and False Criteria Channel 5 example below limit channel 4 example inside window In this example channel 5 is programmed with reference to one setpoint limit A defining a low limit Channel 4 is 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 5 Below limit A for True When channel 5 analog input voltage is below the limit channel 5 A update DAC1 with output value 0 0 V False When the above stated condition is false update DAC1 with the Output Value of 1 0 V 4 Within window True When Channel 4 s analog input voltage is within
62. u avoid injuring yourself and others damaging your hardware or losing your data lt H 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 InstaCal 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 BNC MCC s Specifications USB 1616HS BNC the PDF version of the Specifications chapter in this guide is available on our web site at www mccdaq com pdfs USB 1616HS BNC pdf MCC s Quick Start Guide is available on our web site at www meccdaq com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal Connections is available on our web site at www mccdaq com signals signals pdf MCC s Universal Library User s Guide is available on our web site at www mccdag com PD Fmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on our web site at www mecdag com PDFmanuals sm ul functions pd
63. uding relays proximity switches and encoders There are two debounce modes as well as a debounce bypass as shown in Figure 10 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 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 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 DB 37 connector To Counters Buffer Inverter Figure 10 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 24 USB 1616HS BNC User s Guide Functional Details Figure 11 Debounce module trigger after stable mode The following time periods T1 through T5 pertain to Figure 11 In trigger after stable mode the input signal to the debounce module is re
64. unters 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 valid reference value is present and that the first trigger is legitimate 27 USB 1616HS BNC User s Guide Functional Details Figure 16 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 Figure 17 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 countercl
65. utput drive capability and the input impedance of the USB 1616HS BNC 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 18 shows the connections for one encoder to a USB 1616HS BNC module 5VDC pin 23 CTRO pin 9 To Encoder A CTR1 pin 27 To Encoder B CTR2 pin 8 To Encoder z DGND pin 5 ENCODER Other DGND pins pins 14 25 28 or 33 can also be used Figure 18 Connections from single encoder to DSUB37 pins on the USB 1616HS BNC 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 if 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 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 en
66. 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 TTLTRG 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 20 USB 1616HS BNC User s Guide Functional Details 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 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 BNC avoids this situation by using pre trigger data When software based triggering is used and the PC d
67. ximum Digital pattern triggering 8 bit or 16 bit pattern triggering on any of the digital ports Programmable for trigger on equal not equal above or below a value Individual bits can be masked for don t care condition Latency One scan period maximum Counter totalizer triggering Counter totalizer inputs can trigger an acquisition User can select to trigger on a frequency or on 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 8 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 yA Low level output voltage 0 4 V maximum 400 pA Power consumption Table 9 Power consumption specifications Power consumption per board 2 5 W maximum External power The power supply MCC p n TR 2U and line cord MCC p n CA 1 are required Table 10 External power specifications Connector Switchcraft RAPC 712 Power range 6 to 16 VDC Over voltage 20 V for 10 seconds maximum 45 USB 1616HS BNC User s Guide Specifications USB specifications Table 11 USB specifications USB devic

USB-1616HS-BNC User's Guide - from Measurement Computing

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