DT9826 Datasheet
Contents
1. careful design with many years of experience So conditions of use really determine the accuracy for dynamic measurements The ENOB number can be higher Fig 4a d if less than full scale is used e g 1 2 scale but this would give a misleading picture for many users Download the ENOB white paper http www datatranslation com ENOBPAPER IBF Input Below Full Scale Specified in dB N D Signal to Noise plus Distortion also represented as SINAD represents how far the input sine wave is below Specified in dB it is the ratio of the signal to the sum of all noise and distortion the full scale capability of the A D components ENOB Effective Number of Bits of a DI9826 02 x Function UFI A D Frequency EHOB Effective Number of Bits Specified in bits it is defined as follows ENOB SINAD 1 76 IBF 6 02 Fundamental Signal SFDR Spurious Free Dynamic Range It is the ratio of the RMS value of the fundamental signal to the next largest noise or distortion component from DC up to the Nyquist frequency First Value Input Voltage 07 5045 M 5l Frequency File In Input Frequency 1016 Hertz Fie ut Stop 1 WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 ENOB Effective Number of Bits of a DT9826 02 About Hook Up Gain 1 Frequency Dynamic Data IBF 111 15 dB S N D 13 6 dB ENOB 15 3 First Value l 00 0007 Frequency File In2. 430 Hertz File Out Stop t 20000 Auto 2v DA Figure 4 a OV input 40kHz sampling rate a P ENOB Effective Number of Bits of a DT9826 02 About Hook Up E Gain 1 E Dynamic Data IBF 6 14 dB ssu Frequency 5 7 N D 84 63 dB E 40000 ENOB 14 8 i 1024 Point FFT using a DT9826 02 20dB AUdB First Value 2 7438 ry Frequency File In 1016 Hertz File Out Stop Figure 4 c 1 2 full scale 40kHz sampling rate a f ssu ow 1024 Point FFT using a DT9826 02 ENOB Effective Number of Bits of a DT9826 02 About Hook Up Ej ssu ama Gain 1 Frequency Dynamic Data IBF 106 4 dB S H D 8 59 dB ENOE 16 1024 Point FFT using a DT9826 02 First Value 00 0003 m Frequency File In 1035 Hertz File Out Stop 1 10000 Fus Auto Figure 4 b OV input 20kHz sampling rate pa rF ENOB Effective Number of Bits of a DT9826 02 X About Hook Up Gain 1 Dynamic Data IBF 5 26 dB Frequency 5 M D 86 26 dB 0000 ENOB 15 1 m 1024 Point FFT using a DT9826 02 20dB AUdB First Value 02 9881 Frequency File In 996 Hertz File Out Stop 1 10000 E Auto Figure 4 d 1 2 full scale 20kHz sampling rate WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 ENOB Effective Number of Bits of a DT9826 02 About Hook Up Gain 1 C i
3. Making Dynamic Measurements FIGURES 4a 4f The FFT plots show the dynamic performance of the DT9826 Many users believe that a 24 bit A D system will give 24 bit accuracy or at least close to that accuracy But when measuring a dynamic signal i e with frequency components above DC other factors degrade the measurement in attaining that 24 bit accuracy Noise and harmonic distortion are key factors to degrading accuracy Also phase shift becomes an issue at low bandwidths But it isn t just the circuitry Layout of the critical circuit etch spacing between noise generating and noise sensitive devices as well as analog and digital etch patterns and thermal effects from one circuit to another are all culprits in degrading accuracy Therefore DC specifications are useful and plots in Fig 4 a and 4 b yield the best ENOB figures of merit at 16 bit accuracy from all errors at operating throughputs of 40kHz and 20kHz But this is with zero signal level But dynamic FFT plots at higher input voltage and maximum operating frequency give the best indicator of accuracy Fig 4 c and 4 d show results at 1 2 full scale 6dB and yield good results at approximately 15 bits ENOB Effective Number if Bits performance Now worst case is Fig 4 e and 4 f showing maximum signal level of 10V and sample rates of 40kHz and 20kHz The ENOB plot shows 14 3 rather than the full 24 bit accuracy This number is actually outstanding and has been attained through
4. Point FFT using a gt DT9826 02 20dB AUdB BBUdB wd h do o o0 12 dB 140dB 160d6 First Value 07 5045 fa Frequency File In uM 1016 Hertz File Out Stop il Figure 4 e Full scale 40kHz sampling rate Input Sample Clock Sources The DT9826 module provides an internal A D clock source for pacing analog input operations Using software specify the clock source as internal and the clock frequency at which to pace the operation The minimum clock frequency is 10Hz DT9826 supports a maximum clock frequency of 41 6kHz All input channels are clocked simultaneously at the specified rate Notes According to sampling theory Nyquist Theorem a frequency that is at least twice as fast as the input s highest frequency component should be specified For example to accurately sample a 10kHz signal a sampling frequency of at least 20kHz should be used Doing so avoids an error condition called aliasing in which high frequency input components erroneously appear as lower frequencies after sampling The input sample clock also paces the acquisition of the digital input port counter timers and tachometer if specified in the analog input channel list WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 ENOB Effective Number of Bits of a DT9826 02 About Hook Up Gain Frequency 1024 Point FFT using a gt DT9826 02 20dB AUdB 60d
5. m EP355 Screw terminal panel EP356 Accessory panel with two 37 pin D sub connectors EP360 2 meter shielded cable for the EP353 and STP37 STP37 Screw terminal panel Software The following software is available for purchase separately quickDAQ SP8501 CD High performance ready to run application that lets you acquire plot analyze and save data to disk at up to 2 MHz per channel Free Software Downloads The following software is available for free download from our website DAQ Adaptor for MATLAB Access the analyzation and visualization tools of MATLAB LV Link Access the power of Data Translation boards through LabVIEW Copyright 2012 Data Translation Inc All rights reserved All trademarks are the property of their respective holders Prices availability and specifications are subject to change without notice WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 DATA TRANSLATION
6. order of the channels in the channel list does not matter The same channel cannot be specified more than once in the list Using software 20 entries can be entered in the channel list for sampling including the analog input channels digital input port two 32 bit counter timers and the 32 bit tachometer input This feature is particularly useful for correlating the timing of analog digital counter timer and tachometer events When reading all input channels simultaneously total throughput rates of up to 833 kSamples second can be achieved DATA TRANSLATION High Density Simultaneous USB DT9826 is designed on an 8 layer board using both the front and back to provide superior performance under all conditions Particular emphasis on the layout is critical to this performance DC DC Converters provide Simultaneous Analog Inputs internal analog voltages 4 8 or 16 Individual 24 bit 2 3 Provide power to buffers sigma delta A D per channel sae so eae ES M S zin M CHE E71 oa S XE atte He Fully protected 500V mr NE iui galvanic isolation protects M de i your PC and maintains aD do signal integrity breakdown 8 digital input lines amp m gap in etch 8 digital output lines ya with flexibility for time B stamping pattern OHERS DNE 209 recognition and ie SN ENT Lua em LENT synchronizing sr Ee Signal conditioning and ESD protection Sy E HEEL EA with extern
7. read by including channel 16 in the analog input channel list The starting edge is programmable either rising or falling The software automatically synchronizes the value of the tachometer input with the analog input measurements so that all measurements are correlated in time The tachometer input is treated like any other channel in the analog input channel list therefore all the triggering and conversion modes supported for analog input channels are supported for the tachometer input Digital I O Lines DT9826 modules support one digital input port consisting of 8 digital input lines and one digital output port consisting of 8 digital output lines The resolution is fixed at 8 bits A digital line is high if its value is 1 a digital line is low if its value is 0 On power up or reset a low value 0 is output from each of the digital output lines The DT9826 module supports the following digital I O operation modes m Single value operations are the simplest to use but offer the least flexibility and efficiency The digital I O port is specified Data is then read from or written to all the digital I O lines For a single value operation a clock or trigger source cannot be specified Single value operations stop automatically when finished m Continuous digital input takes full advantage of the capabilities of the DT9826 module The digital input port all 8 digital input lines is specified as channel 19 in the analog in
8. this is called a high edge gate type Note that this gate type is used for edge to edge measurement one shot and repetitive one shot mode Pulse Output Types and Duty Cycles The DT9826 modules can output the following types of pulses from each counter timer m High to low transitions The low portion of the total pulse output period is the active portion of the counter timer clock output signal m Low to high transitions The high portion of the total pulse output period is the active portion of the counter timer pulse output signal The pulse output type is specified in software The duty cycle or pulse width indicates the percentage of the total pulse output period that is active For example a duty cycle of 50 indicates that half of the total pulse output is low and half of the total pulse output is high The duty cycle is specified in software USB 2 0 Compatibility The DT9826 module is fully compatible with USB 2 0 and USB 1 1 USB 2 0 extends the speed of connection to up to 480Mbps For optimal performance it is recommended that the DT9826 module be used with a USB 2 0 port The DT9826 can be used with a USB 1 1 port but at USB 1 1 performance The DT9826 is a complete high speed 24 bit data acquisition system that runs on USB power 500V Galvanic Isolation Protects Your Data Computers are susceptible to ground spikes through any external port These spikes can cause system crashes and may even cause pe
9. 3 or EP356 accessory panel Can be used with BNC and OEM versions EP333 2 meter shielded cable with two 37 pin connectors that connect an EP356 accessory panel to an STP37 screw terminal panel Can be used with the BNC and OEM versions for DIO and C T connections EP360 2 meter shielded cable with two 37 pin connectors that connect an EP353 accessory panel to an STP37 screw terminal panel Can be used with the BNC and OEM versions for analog input connections Figure 9 This example shows an EP353 accessory panel which plugs into connector J2 and an EP356 accessory panel which plugs into J3 below Figure 10 With the optional DIN rail mounting kit BNC DIN RAIL KIT you can mount the DT9826 BNC model to a standard DIN rail For more information about the DT9826 including specifications please visit http www datatranslation com info DT9826 Ordering Information All Data Translation hardware products are covered by a 1 year warranty For pricing information please visit our website or contact your local reseller Hardware DT9826 DT9826 0EM DT9826 4 DT9826 4 OEM DT9826 8 DT9826 8 OEM Accessories BNC DIN Rail Kit Kit for mounting USB modules in BNC enclosure to a DIN rail Includes mounting clips screws and instructions DIN Rail not included EP333 2 meter shielded cable for the EP356 and STP37 EP353 Accessory panel with one 37 pin connector and one 27 pin connector
10. B B dB 100d6 1204dB M dB 15 0dB First Value 04 8772 h GV DA DEN o sy 0a Frequency File In 996 Hertz File Gut Stop 1 Lest Quit Figure 4 f Full scale 20kHz sampling rate Analog Input Conversion Modes The DT9826 module supports the following conversion modes m Single Value Mode m Continuous Scan Mode Single Value Mode Single value operations are the simplest to use The analog input channel to sample is specified in software The module acquires the data from the specified channel and returns the data immediately For a single value operation a clock source trigger source scan mode or buffer cannot be specified Single value operations stop automatically when finished Continuous Scan Mode Continuous scan mode takes full advantage of the capabilities of the DT9826 module Use continuous scan mode to accurately control the period between successive simultaneous conversions of all channels in a channel list Using software the channel list clock source trigger source scan mode and buffer are specified When it detects the start trigger the module simultaneously acquires pre trigger data from all of the input channels including the digital inputs counter timers and tachometer input and converts the data from the analog input channels If the channel is included in the channel list the sampled data is placed in the allocated buffer s When the reference trigge
11. DT9826 Series Portable Simultaneous USB Data Acquisition Module The DT9826 is a high performance multifunction data acquisition DAQ module for the USB bus The DT9826 features 4 8 or 16 simultaneous analog inputs 16 digital input output lines 2 counter timers and a tachometer All subsystems can be run synchronously The DT9826 runs on USB power with sampling rates up to 41 6 kSamples second making it ideal for portable applications Key Features Powered by USB portable m Simultaneous operation of analog input digital I O counter timer and tachometer subsystems m 24 bit Sigma Delta ADC per channel m 4 8 or 16 single ended simultaneous analog input channels m Throughput rate up to 41 6 kSamples second channel m Simultaneous operation of analog input digital I O counter timer and tachometer subsystems at total throughput rates of over 830 kSamples second m 10V input range Read the digital inputs the two 32 bit counters and one tachometer input using the A D subsystem and the A D clock to synchronize digital and analog measurements m 8 digital input 8 digital output lines Two 32 bit counter timer C T channels that perform event counting up down counting frequency measurement edge to edge measurement continuous edge to edge measurement continuous pulse output one shot and repetitive one shot operations One 32 bit tachometer input channel Read the value of the tachometer input in th
12. Detect Any ADC Channel 1 Analog Input 9 24 Bit 0 ADC l g G l E l c os l 24 Bit is Analog Input gt l 15 i ADC 7 b a i LO 6 inne s Chane a Control amp m D Trigger ma USB Tachometer Teen Logic LL D 1 Input g UserClock 1 0 UserClock 1 0 3 x Sa UserGate 1 0 UserGate 1 0 Counter UserOut 1 0 UserOut 1 0 Timers Digitalln 7 0 8 bit Digital In DigitalOut 7 0 8 bit Digital Out Figure 2 DT9826 Block Diagram Figure 3 USB module portability TER requires in rush current to always be below 500mA allowing 50 micro Columbs spike for short duration Exceeding this level can L ElL 8 e H lt lt gt gt shut down the port The DT9826 sequences the internal power supplies to keep this current under the maximum allowed to guarantee pristine measurements The left side of graph shows the current ramping up as the internal power supplies are sequenced in order to keep the inrush current under 500mA The right side shows a very slight increase to 450mA when the clock frequency is increased from 20KHz to 40KHz ri simple Chart Recorder Simple Chart Recorder Example Startup in rush Max throughput current being of 40kHz sequenced i as ui X t s 1 DT9826 10 A D0 Channel 0 V T9826 10 v 50000 Start Stop WWW DATATRANSLATION COM US Canapa 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0
13. Visual C DTx EZ complies with the DT Open Layers standard DAQ Adaptor for MATLAB Data Translation s DAQ Adaptor provides an interface between the MATLAB Data Acquisition DAQ toolbox from The MathWorks and Data Translation s DT Open Layers architecture m LV Link Data Translation s LV Link is a library of VIs that enable LabVIEW programmers to access the data acquisition features of DT Open Layers compliant USB and PCI devices WWW DATATRANSLATION COM US Canapa 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 Accessories The following optional accessories are available for use with the DT9826 module Figure 8 The EP333 cable along with the STP37 allow screw terminal connections to the EP356 shown EP353 Accessory panel Provides one 37 pin connector and one 26 pin connector for attaching analog input signals Used with the STP37 and EP360 For OEM configurations only EP355 This screw terminal panel provides a 14 position screw terminal block for attaching analog input digital I O counter timer and clock signals For OEM configurations only EP356 This accessory panel provides two 37 pin D sub connectors for attaching analog ouput digital I O counter timer tachometer and trigger signals Used with the STP37 and EP333 For OEM configurations only STP37 This screw terminal panel allows connections to analog input digital I O counter timer tachometer and trigger signals from the EP35
14. al events gt aj Situ cord iod Full featured Counter uen s Tin pu a Ti LH a 3 capacitors diode clamping MU 3 uuu z rovide scaling to high Two 32 bit C T channels a an O P J 3 I dq J impedance buffers for counting events up EE fou He WW down edge to edge DEM Lu discrete or continuous D TED EAT o uu pulse output ideal for E AN B TEL 92 Li ere SPL L LPL bos testing apps LELITTLETEEELLEELELLLTLLELLLLTLELLLLITEO fi Aiii on iii Vale E Gk eae i Analog isolation barrier Fa tak imm F 1 z i E inet wee Pm pi ee y Ji Me e Serial data from 16 A D C anne ecc f k Sena a s Pants P 3117 channels Reads rotation values NI E 1 Yee tenet NN s IN 2400 of period or frequency synchronously with analog input measurements Multi trigger modes Software external or High Speed USB 2 0 USB 2 0 connector for data analog threshold trigger transfer at 480Mbps available as trigger optional pin substitute for sources Flexible Power Connections embedded OEM use Portable operation for full specifications optional 5V connection for secondary use when desired WWW DATATRANSLATION COM US Canapa 800 525 8528 Europe Asia 49 0 7142 95310 Ext ADC Trigger Threshold Trigger
15. e analog input data stream to measure the period or frequency of the tachometer synchronously with analog input measurements m Internal clock source m Software programmable trigger source software external digital trigger analog threshold trigger m 500V galvanic isolation barrier that prevents ground loops to maximize analog signal integrity and protect your computer m Available either installed in a metal BNC connection box or as a board level OEM version that can be installed in your own custom application WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 DT9826 USB Data Acquisition Module DATA TRANSLAT 70N A Figure 1 Portable measurements can now be made with 4 8 or 16 individual A D channels Each 24 bit sigma delta A D runs in parallel to prevent interference between channels The DT9826 is fully featured with DIO 32 bit C Ts tachometer and multi trigger modes Software options abound to accommodate any environment Available in BNC box or as embedded board level OEM version Analog Input Channels The DT9826 supports 4 8 or 16 single ended analog inputs Each channel features its own 24 bit A D converter with sampling rates up to 41 6 kSamples second Using the DT9826 module data can be acquired from a single analog input channel or from a group of analog input channels using the analog input channel list Because these modules feature simultaneous sampling the
16. nge from 0 011176Hz to 24MHz Counter timer operations start on the rising edge of the clock input signal A clock divider between 2 and 4 294 967 296 is supported Gate Types The edge or level of the Counter n Gate signal determines when a counter timer operation is enabled The DT9826 module supports the following gate types m None A software command enables any counter timer operation immediately after execution m Logic low level external gate input Enables a counter timer operation when the gate signal is low and disables the counter timer operation when the gate signal is high Note that this gate type is used for event counting and rate generation modes m Logic high level external gate input Enables a counter timer operation when the gate signal is high and disables a counter timer operation when the gate signal is low Note that this gate type is used for event counting and rate generation modes m Falling edge external gate input Enables a counter timer operation when a high to low transition is detected on the gate signal In software this is called a low edge gate type Note that this gate type is used for edge to edge measurement one shot and repetitive one shot mode WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 m Rising edge external gate input Enables a counter timer operation when a low to high transition is detected on the gate signal In software
17. or an external negative digital TTL trigger m Analog threshold trigger for the start and reference trigger An analog threshold trigger event occurs when the signal on a specified analog input channel rises above or falls below a programmable threshold level Using software the following parameters are specified start trigger source any one of the analog input channels as the threshold input channel and a threshold level between 10 V Data Transfer Before acquisition begins buffers must be allocated to hold the data An event is raised whenever a buffer is filled allowing data to be moved and or processed as needed Data is written to multiple allocated input buffers continuously when no more empty buffers are available the operation stops The data is gap free WWW DATATRANSLATION COM US CaNADA 800 525 8528 EuRoPE AsiA 49 0 7142 9531 0 Tachometer Input Features The DT9826 module supports a tachometer signal with a range of 30V This signal has a maximum frequency of 1 MHz and minimum pulse width of 0 4us The threshold voltage is fixed at 2V with 0 5V of hysteresis The frequency or period of the tachometer input signal can be measured to calculate the rotation speed for high level 30V tachometer input signals An internal 12 MHz counter is used for the measurement yielding a resolution of 83 ns 1 12MHz The number of counts between two consecutive starting edges of the tachometer input signal can be
18. put channel list A clock source scan mode trigger source buffer and buffer wrap mode for the digital input operation can be specified The input sample clock internal or external paces the reading of the digital input port as well as the acquisition of the analog input and counter timer channels Counter Timer Channels The DT9826 modules provide two 32 bit counter timers Each counter accepts a clock input signal and gate input signal and outputs a pulse pulse output signal Using software one or both of the counter timers can be specified in the analog input channel list as channels 17 and 18 Counter Timer Operation Modes DT9826 modules support numerous counter timer operation modes including event counting up down counting frequency measurement edge to edge measurement continuous edge to edge measurement rate generation one shot and repetitive one shot Counter Timer Clock Sources The following clock sources are available for the counter timers m Internal C T clock The internal C T clock always uses an 48 MHz time base Through software specify the clock source as internal and specify the frequency at which to pace the operation this is the frequency of the Counter n Out signal m External C T clock An external C T clock is useful to pace counter timer operations at rates not available with the internal C T clock or to pace at uneven intervals The frequency of the external C T clock can ra
19. r occurs pre trigger acquisition stops and post trigger acquisition starts The operation continues until the number of samples you specify for the post trigger scan count are acquired at that point the operation stops The conversion rate is determined by the frequency of the input sample clock The sample rate which is the rate at which a single entry in the channel list is sampled is the same as the conversion rate due to the simultaneous nature of the module Input Triggers A trigger is an event that occurs based on a specified set of conditions On the DT9826 a start trigger and reference trigger can be specified Pre trigger acquisition starts when the module detects the start trigger event When the reference trigger occurs pre trigger acquisition stops The DT9826 module supports the following trigger sources m Software trigger for the start trigger A software trigger event occurs when the analog input operation is started the computer issues a write to the module to begin conversions Using software the trigger source is specified as a software trigger m External digital TTL trigger for the start trigger An external digital TTL trigger event occurs when the DT9826 module detects either a rising edge positive or falling edge negative transition on the signal connected to the AD Trig connector on the module Using software the trigger source is specified as an external positive digital TTL trigger
20. r utilities m quickDAQ application An evaluation version of this NET application is included on the Data Acquisition M Omni CD quickDAQ acquires analog data from all devices a E alalalalalala supported by DT Open Layers for NET software at high speed plots it during acquisition analyzes it and or Figure 7 quickDAQ acquires analog data from all devices supported saves it to disk for later analysis Note quickDAQ supports by DT Open Layers for NET software at high speed plots it during analog input functions only acquisition analyzes it and or saves it to disk for later analysis m Quick DataAcq application The Quick DataAcq application provides a quick way to get up and running using your DAO module Using this application verify key features of the module display data on the screen and save data to disk m DT Open Layers for NET Class Library Use this class library if you want to use Visual C or Visual Basic for NET to develop application software for your USB module using Visual Studio 2003 2005 2008 the class library complies with the DT Open Layers standard m DataAcq SDK Use the Data Acq SDK to use Visual Studio 6 0 and Microsoft C or C to develop application software for your module using Windows the DataAcq SDK complies with the DT Open Layers standard m DTx EZ DTx EZ provides ActiveX controls which allows access to the capabilities of your module using Microsoft Visual Basic or
21. rmanent damage to the computer The DT9826 module features 500 Volts of galvanic isolation to protect the computer from ground spikes and to ensure a reliable stream of data Documentation The DT9826 module includes a user s manual that provides getting started and reference information about using the DT9826 The manual is provided in electronic PDF format on the Data Acquisition Omni CD provided with the module Technical Support Application engineers are available by phone and email during normal business hours to discuss your application requirements Extensive product information including drivers example code pinouts a searchable Knowledge Base and much more is available 24 hours a day on our web site at www datatranslation com Software Options Bee u H gt m D Tmeopy 4 46 b H A QnalQgQQgagay Collector Viewer File Viewer Many software choices are available for application Select Subsystem development from ready to measure applications to programming environments and run under Microsoft i Windows XP Vista 7 memes mi The following software is available for use with this USB DAQ EAT module and is provided on the Data Acquisition Omni CD ks am m Device Driver The device driver allows the use of this si an USB DAQ module with any of the supported software packages o
Download Pdf Manuals
Related Search