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Data Translation DT9857 Скачать руководство пользователя страница 81

Principles of Operation

81

Note:

The Input Trigger LED on the module, shown in

, is amber to indicate an

armed condition when the module is waiting for an external digital trigger, threshold trigger,
or Sync Bus trigger (the module must have been configured for one of these trigger types),
green when the module has been triggered, or off when the module is idle.

Start Trigger Sources

DT9857 and DT9857E modules support the following sources for the start trigger:

•

Software trigger

– A software trigger event occurs when you start the analog input

operation (the computer issues a write to the module to begin conversions). Using
software, specify the start trigger source as a software trigger.

•

External digital (TTL) trigger

– For the DT9857 module, an external digital (TTL) trigger

event occurs when the module detects a rising- or falling-edge transition on the signal
connected to the External Trigger pin (pin 11) of the Digital connector on the module. For
the DT9857E module, an external digital (TTL) trigger event occurs when the module
detects a rising- or falling-edge transition on the External Trigger BNC input of the
module.

Using software, specify the trigger source as an external, positive digital (TTL) trigger for
a rising-edge external trigger or an external, negative digital (TTL) trigger for a
falling-edge external trigger.

•

Threshold trigger

– The start trigger event occurs when the signal attached to a specified

analog input channel in the channel list rises above or falls below a user-specified
threshold value. Using software, specify the following parameters:



Start trigger source – Specify a positive (low-to-high transition) threshold trigger if you
want to trigger when the signal rises above a threshold level, or a negative
(high-to-low transition) threshold trigger if you want to trigger when the signal falls
below a threshold level.



Threshold channel – Specify any one of the analog input channels as the threshold
input channel.



Threshold level – Specify a value between ±10 V for a gain of 1 or ±1 V for a gain of 10
as the threshold level.

Note:

If you choose a threshold trigger as both the start trigger and the reference trigger,

the threshold channel and threshold level must be the same. The polarity of the trigger
(positive or negative going) can be different for each trigger source.

•

Sync Bus trigger

– When multiple DT9857 or DT9857E modules are connected together

using the Sync Bus (RJ45) connectors, you can use the Sync Bus trigger as the start trigger
of the analog input subsystem on the slave module by setting the synchronization mode
of the analog input subsystem of the module to Slave. In this configuration, any other start
trigger for the slave module is ignored. Refer to

for more information on this

configuration.

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Содержание DT9857

Страница 1: ...DT9857 and DT9857E UM 25656 N User s Manual Title Page ...

Страница 2: ...n any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support device...

Страница 3: ...ions to this equipment not expressly approved by Data Translation could void your authority to operate the equipment under Part 15 of the FCC Rules Note This product was verified to meet FCC requirements under test conditions that included use of shielded cables and connectors between system components It is important that you use shielded cables and connectors to reduce the possibility of causing...

Страница 4: ......

Страница 5: ... Power to the DT9857E Module 33 Attaching Modules to the Computer 34 Connecting Directly to the USB Ports 34 Connecting to an Expansion Hub 35 Configuring the DT9857 Series Device Driver 38 Chapter 3 Wiring Signals 41 Preparing to Wire Signals 43 Wiring Recommendations 43 Warm Up Time 43 Wiring Signals to the Module 43 Connecting Analog Input Signals 48 Connecting Analog Output Signals 49 Connecti...

Страница 6: ... Analog Input Features 76 Analog Input Channels 76 Input Ranges and Gains 76 IEPE Functions 77 Input Resolution 77 Input Clock Source 77 Analog Input Conversion Modes 78 Single Value Operations 78 Single Values Operations 78 Continuous Scan Mode 79 Input Triggers 80 Start Trigger Sources 81 Reference Trigger Sources 82 Data Format and Transfer 83 Error Conditions 83 Analog Output Features 84 Analo...

Страница 7: ...ing Acquisition on Multiple Modules 104 Synchronizing Acquisition on Multiple Modules 105 Synchronizing the Analog Input Subsystems of Multiple DT9857 Modules 105 Synchronizing the Analog Input and or Analog Output Subsystems of Multiple DT9857E Modules 108 Chapter 6 Supported Device Driver Capabilities 113 Data Flow and Operation Options 115 Buffering 116 Triggered Scan Mode 116 Data Encoding 116...

Страница 8: ...ifications 152 General Purpose Counter Timer Specifications 153 Trigger Specifications 154 Master Oscillator Specifications 155 Power Physical and Environmental Specifications 156 Regulatory Specifications 157 Connector Specifications 158 External Power Supply Specifications 159 Appendix B Connector Pin Assignments and LED Status Indicators 161 Analog Input Connectors 162 Analog Output Connectors ...

Страница 9: ... 9 LED Status Indicators 176 LED Status Indicators on the DT9857 Module 176 LED Status Indicators on the DT9857E Module 178 Appendix C Register Level Programming 181 Writing to the EEPROM Register 182 Index 185 ...

Страница 10: ...Contents 10 ...

Страница 11: ... is assumed that you have some familiarity with data acquisition principles and that you understand your application How this Manual is Organized This manual is organized as follows Chapter 1 Overview describes the major features of the DT9857 and DT9857E modules as well as the supported software and accessories for the modules Chapter 2 Setting Up and Installing the Module describes how to apply ...

Страница 12: ...module Benefits of the Universal Serial Bus for Data Acquisition This white paper describes why USB is an attractive alternative for data acquisition It is available on the Data Translation web site www mccdaq com QuickDAQ User s Manual UM 24774 This manual describes how to create a QuickDAQ application to acquire and analyze data from a DT Open Layers data acquisition module DT Open Layers for NE...

Страница 13: ...r using a DT9857 or DT9857E module the Technical Support Department is available to provide technical assistance Refer to Chapter 7 for more information If you are outside the United States or Canada call your local distributor whose number is listed on our web site www mccdaq com ...

Страница 14: ...About this Manual 14 ...

Страница 15: ...15 1 Overview Hardware Features 16 Supported Software 19 Supported Accessories 22 Getting Started Procedure 24 ...

Страница 16: ...16 Module Shown Note that OEM versions of the modules are also available The OEM versions of the modules do not include an enclosure or an external power supply The key features that are common to both the DT9857 and DT9857E modules are as follows Simultaneous analog input and waveform analog output operations Analog input subsystem Up to eight analog input channels on the DT9857 8 and DT9857E 8 m...

Страница 17: ...log output channel Single value waveform and continuous streaming output Programmable output rate from 30 kSamples s to 216 kSamples Output range of 10 V Software programmable trigger source software trigger or external digital trigger to start the analog output operation Supports the ability to update the digital output port synchronously with the analog output channels Eight digital input lines ...

Страница 18: ... connector or the 3 position Phoenix connector on the module Synchronization All the analog input channels of up to four modules can be synchronized using the Sync Bus The Sync Bus is implemented with one RJ45 connector on each module and an optional RJ45 distribution panel with four RJ45 connectors All the analog input channels of up to four modules can be synchronized using the Sync Bus and all ...

Страница 19: ...l list Choose to acquire data continuously or for a specified duration Choose software or triggered acquisition Log acquired data to disk in an hpf file Display acquired data during acquisition in either a digital display using the Channel Display window or as a waveform in the Channel Plot window Choose linear or logarithmic scaling for the horizontal and vertical axes View statistics about the a...

Страница 20: ...vanced FFT Analysis option includes all the features of the QuickDAQ Base version with the FFT Analysis option plus advanced FFT analysis features including the following Allows you to designate a channel as a Reference or Response channel Allows you to perform two channel FFT analysis functions including Frequency Response Functions Inertance Mobility Compliance Apparent Mass Impedance Dynamic St...

Страница 21: ...nslation s DAQ Adaptor provides an interface between the MATLAB Data Acquisition DAQ subsystem from The MathWorks and Data Translation s DT Open Layers architecture LV Link A link to LV Link is included on the Data Acquisition OMNI CD Use LV Link if you want to use the LabVIEW graphical programming language to access the capabilities of a DT9857 or DT9857E module Refer to the Data Translation web ...

Страница 22: ...odule STP25 screw terminal panel A screw terminal panel that connects to the Digital connector on the DT9857 or DT9857E module using the 25 pin 1 5 meter EP403 cable that is included with the STP25 screw terminal panel Figure 3 shows the STP25 and EP403 cable Figure 3 STP25 Screw Terminal Panel and EP403 Cable ...

Страница 23: ...to four DT9857 modules together using the Sync Bus connector Refer to page 105 for more information on using this panel Figure 4 EP386 Panel Note The EP386 is not used with the DT9857E and DT9857E OEM modules EP402 Rack Mount Kit The EP402 Rack Mount Kit allows you to mount the DT9857 or DT9857E in a 19 inch rack The kit includes mounting clips screws and instructions The rail is not included ...

Страница 24: ...diagram is repeated in each Getting Started chapter the shaded area in the diagram shows you where you are in the getting started procedure Figure 5 Getting Started Flow Diagram Set Up and Install the Module see Chapter 2 starting on page 27 Wire Signals see Chapter 3 starting on page 41 Verify the Operation of the Module see Chapter 4 starting on page 61 ...

Страница 25: ...Part 1 Getting Started ...

Страница 26: ......

Страница 27: ...27 2 Setting Up and Installing the Module Unpacking 29 System Requirements 30 Applying Power to the Module 31 Attaching Modules to the Computer 34 Configuring the DT9857 Series Device Driver 38 ...

Страница 28: ...Chapter 2 28 Set Up and Install the Module this chapter Wire Signals see Chapter 3 starting on page 41 Verify the Operation of the Module see Chapter 4 starting on page 61 ...

Страница 29: ...ROM If an item is missing or damaged contact Data Translation If you are in the United States call the Customer Service Department at 508 946 5100 An application engineer will guide you through the appropriate steps for replacing missing or damaged items If you are located outside the United States call your local distributor listed on our web site www mccdaq com Note DT9857 and DT9857E modules ar...

Страница 30: ...operation ensure that your computer meets the following system requirements Processor Pentium 4 M or equivalent RAM 1 GB Screen Resolution 1024 x 768 pixels Operating System Windows 10 Windows 8 Windows 7 Windows Vista 32 and 64 bit Disk Space 4 GB ...

Страница 31: ...857 Module To apply power to the DT9857 module do the following 1 Ground the chassis of the module to earth ground by connecting a grounding strap to the grounding stud on the rear panel of the module as shown in Figure 6 Figure 6 Connect a Grounding Strap to the Grounding Stud on the DT9857 Module 2 Connect the EP361 power supply to the power connector on the DT9857 module as shown inFigure 7 3 P...

Страница 32: ...Chapter 2 32 Figure 7 Attaching an External Power Supply to the DT9857 Module DT9857 Module Rear Panel Connect the EP361 Power Supply to the Module and to the Wall Outlet EP361 5 V Power Supply ...

Страница 33: ...module as shown in Figure 8 or connect your own 4 75 VDC to 28 VDC power supply to the 3 position power terminal block Figure 8 Attaching an External Power Supply to the DT9857E Module 2 Plug the power supply into a wall outlet DT9857E Module Rear Panel EP361 5 V Power Supply Connect your own 4 75 VDC or 28 VDC Power Supply Connect the EP361 Power Supply OR Connect Your Own 4 75 VDC to 28 VDC Powe...

Страница 34: ...e before connecting the module s to the host computer Run the installation program on your Data Acquisition OMNI CD to install the device driver and other software for the module Connecting Directly to the USB Ports To connect a DT9857 or DT9857E module directly to a USB port on your computer do the following 1 Make sure that you have attached an external power supply to the module 2 Attach one en...

Страница 35: ...d your module to the host computer the Power LED on the module turns solid green In addition the USB LED on the module turns solid green once the module is enumerated Connecting to an Expansion Hub Expansion hubs are powered by their own external power supply The practical number of DT9857 or DT9857E modules that you can connect to a single USB port depends on the throughput you want to achieve To...

Страница 36: ...ically 6 Repeat these steps until you have attached the number of expansion hubs and modules that you require Refer to Figure 10 The operating system automatically detects the USB devices as they are installed Figure 10 Attaching Multiple DT9857 or DT9857E Modules Using Expansion Hubs USB Cable Expansion Hubs Host Computer DT9857 or DT9857E Module Power Supply for Hub DT9857 or DT9857E Module DT98...

Страница 37: ...ing a proper USB reset The DT9857E operates from 4 75 V to 28 V and the sense circuit is set at 4 6 V because of tolerances To solve this problem you must use a 2 A diode in series with the USB 3 0 hub power supply This will also ensure that a reverse power supply will not cause any damage Once you have applied external power to the DT9857 or DT9857E module and connected your module to the host co...

Страница 38: ... Start menu select Settings Control Panel 3 From the Control Panel double click Open Layers Control Panel The Data Acquisition Control Panel dialog box appears 4 If you want to rename the module click the name of the module that you want to rename click Edit Name enter a new name for the module and then click OK The name is used to identify the module in all subsequent applications 5 Select the mo...

Страница 39: ...h a 100 resistor Check the Sync Bus Termination checkbox to enable the termination resistor or uncheck the Sync Bus Termination checkbox to disable the termination resistor for the selected module 10 When you are finished click OK to close the Measurement Options dialog box 11 Repeat steps 4 to 10 for the other modules that you want to configure 12 When you are finished configuring the modules cli...

Страница 40: ...Chapter 2 40 ...

Страница 41: ...Analog Input Signals 48 Connecting Analog Output Signals 49 Connecting a Tachometer Input Signal 50 Connecting Digital Input Signals 51 Connecting Digital Output Signals 52 Connecting Counter Timer Signals 53 Connecting Signals for Measure Counter Operations 53 ...

Страница 42: ...Chapter 3 42 Set Up and Install the Module see Chapter 2 starting on page 27 Wire Signals this chapter Verify the Operation of the Module see Chapter 4 starting on page 61 ...

Страница 43: ...agnetic fields such as large electric motors power lines solenoids and electric arcs unless the signals are enclosed in a mumetal shield Prevent electrostatic discharge to the I O while the module is operational Connect all unused analog input channels to analog ground Warm Up Time The DT9857 and DT9857E modules are ideal for acoustic measurements due to their AC coupling and frequency characteris...

Страница 44: ...ule Analog Outputs 0 and 1 IEPE Inputs Analog Inputs 0 to 7 IEPE Inputs Analog Inputs 8 to 15 Digital Connector Digital I O External Trigger C T Power Connector USB Connector Tachometer Input Sync Bus Connector Chassis Ground Stud DT9857 Module Rear Panel DT9857 Module Front Panel ...

Страница 45: ...O and their OEM versions are designed without analog outputs 0 and 1 Analog Outputs 0 and 1 IEPE Inputs Analog Inputs 0 to 7 IEPE Inputs Analog Inputs 8 to 15 Digital Connector Digital I O Tachometer C T Power Connectors USB Connector External Trigger Input Sync Bus Connectors DT9857E Module Rear Panel DT9857E Module Front Panel ...

Страница 46: ...e STP25 screw terminal panel to the Digital connector on the DT9857 or DT9857E module as shown in Figure 15 Figure 15 Connecting the STP25 to the DT9857 or DT9857E Module The STP25 contains one 25 pin connector and a screw terminal block The 25 pin connector provides access to the signals from the Digital connector on the DT9857 and DT9857E modules Figure 16 shows the layout of the STP25 and lists...

Страница 47: ...t C T Gate Digital Ground Digital Input 7 C T Out External Trigger DT9857 Tachometer Input DT9857E Digital Input 6 Digital Input 5 Digital Input 4 Digital Ground Digital Input 3 Digital Input 2 Digital Input 1 Digital Input 0 Digital Ground Currently the event output function is disabled and the output is driven low For the DT9857 pin 11 is the external trigger input and the tachometer input is a ...

Страница 48: ...e signals are connected in single ended mode The DT9857 and DT9857E modules support an input signal range of 10 V using a gain of 1 or 1 V using a gain of 10 Note If you enable the use of the internal excitation current source for IEPE inputs it is recommended that you choose AC coupling Refer to page 76 for more information on IEPE inputs Figure 17 shows how to connect an analog input signal chan...

Страница 49: ...put range of 10 V Figure 18 shows how to connect an analog output signal to a DT9857 or DT9857E module Figure 18 Connecting an Analog Output Signal Note The DT9857E 8 xAO DT9857E 16 xAO and their OEM versions are designed without analog outputs 0 and 1 Note that the connector automatically connects the Analog Ground signal appropriately Load Analog Out 0 ...

Страница 50: ...57E module as shown in Figure 20 Refer to Figure 16 on page 47 for the screw terminal assignments of the STP25 screw terminal panel Note In software you can read tachometer measurements as part of the analog input channel list Refer to page 90 for more information on tachometer measurements Figure 19 Connecting a Tachometer Input Signal to the DT9857 Module Figure 20 Connecting a Tachometer Input ...

Страница 51: ...ls lines 0 and 1 in this case to the STP25 screw terminal panel Refer to Figure 16 on page 47 for the screw terminal assignments of the STP25 screw terminal panel Figure 21 Connecting Digital Inputs Digital Input 1 2 Digital Input 0 Digital Ground TTL Inputs 1 STP25 Connected to the DT9857 or DT9857E 5 ...

Страница 52: ...al Out 0 Digital Ground 16 17 STP25 500 1 Out LED On From DT9857 or DT9857E 100 The output current is determined using the following equation In this example if the maximum output voltage is 3 3 V the LED voltage drop is 0 7 V the internal resistor is 100 and the external resistor is 500 the maximum output current is 4 33 mA Using the minimum output voltage of 2 4 V with the same resistor values t...

Страница 53: ...P25 screw terminal panel described on page 47 Event Counting Figure 23 shows how to connect counter timer signals to the STP25 screw terminal panel to perform an event counting operation on C T 0 using an external gate The counter counts the number of rising edges that occur on the Counter 0 Clock input when the Counter 0 Gate signal is in the active state as specified by software Refer to page 95...

Страница 54: ...rew terminal panel to perform an up down counting operation on C T 0 The counter keeps track of the number of rising edges that occur on the Counter 0 Clock input The counter increments when the Counter 0 Gate signal is high and decrements when the Counter 0 Gate signal is low Refer to page 95 for more information about up down counting operations Figure 25 Connecting Counter Timer Signals for an ...

Страница 55: ...on on C T 0 You specify the active pulse high or low in software The pulse width is the percentage of the total pulse period that is active Refer to page 94 for more information about pulse periods and pulse widths Figure 26 Connecting Counter Timer Signals for a Period Pulse Width Measurement Operation Signal Source Counter 0 Clock Digital Ground 14 16 STP25 Connected to the DT9857 or DT9857E ...

Страница 56: ...this case a rising edge on the Counter 0 Clock signal and the stop edge in this case a falling edge on the Counter 0 Gate signal You specify the start edge and the stop edge in software Refer to page 96 for more information on edge to edge measurement mode Figure 27 Connecting Counter Timer Signals for an Edge to Edge Measurement Operation Signal Source 0 Counter 0 Clock Digital Ground 14 12 Count...

Страница 57: ...the number of counts between two consecutive start edges in this case a rising edge on the Counter 0 Clock signal You specify the start edge in software Refer to page 96 for more information on continuous edge to edge measurement mode Figure 28 Connecting Counter Timer Signals for a Continuous Edge to Edge Measurement Operation Signal Source 0 Counter 0 Clock Digital Ground 14 16 STP25 Connected t...

Страница 58: ... external gate is used Refer to page 97 through page 98 for more information about pulse output operations Figure 29 Connecting Counter Timer Signals for a Pulse Output Operation Using an External Gate Heater Controller Digital Ground 15 Counter 0 Out 16 External Gating Switch 12 Counter 0 Gate 10 Digital Ground STP25 Connected to the DT9857 or DT9857E ...

Страница 59: ... falling edge or rising edge For the DT9857 connect to Tachometer input BNC on the DT9857 For the DT9857E connect pin 11 of the Digital Connector on the DT9857E Digital input 0 falling edge or rising edge Connect to Pin 1 of the Digital Connector Digital input 1 falling edge or rising edge Connect to Pin 2 of the Digital Connector Digital input 2 falling edge or rising edge Connect to Pin 3 of the...

Страница 60: ... set up to measure the number of counts between the starting edge the rising edge of the signal connected to digital input 7 and the stopping edge the rising edge of the clock input signal connected to C T 0 By including measure counter 1 in the analog input channel list you can read the count and determine the time period between the two signals Refer to page 99 for more information on measure co...

Страница 61: ...61 4 Verifying the Operation of a Module Select the Device 63 Acquire Data from an Analog Output Channel 65 ...

Страница 62: ...ta Translation USB and Ethernet devices except the DT9841 Series DT9817 DT9835 and DT9853 54 This chapter describes how to verify the operation of a DT9857 or DT9857E module using the QuickDAQ base version Set Up and Install the Module see Chapter 2 starting on page 27 Wire Signals see Chapter 3 starting on page 41 Verify the Operation of the Module this chapter ...

Страница 63: ...the USB devices in the drop down list If you want to refresh this list to determine if other devices are available click Refresh 4 Select the module name for the module that you want to use from the list of Available Devices and click Add Information about the device including the model number serial number firmware version driver version and scanning status is displayed 5 Optional If you want to ...

Страница 64: ...Chapter 4 64 ...

Страница 65: ... output signal using an analog input channel In this example a 10 V sine wave is output on analog output channel 0 of a DT9857 8 module The analog output channel is connected to analog input channel 0 on the DT9857 8 module Configure the Analog Output Settings For this example configure the analog output channel as follows 1 Click the Output tab of the Acquisition and Config window ...

Страница 66: ... Method select With Acquisition The analog output operation will start when you start acquisition 11 If desired hide the Acquisition Config window by clicking the Auto Hide pin in the top right corner of the window Configure the Analog Input Channel Configure the analog input channel as follows 1 Ensure that the output from analog output channel 0 is connected to the input of analog input channel ...

Страница 67: ...ice Since this example is monitoring a voltage input the Current Source checkbox is not checked disabled for the analog input channel 8 Under the Engineering Units column select the engineering units for the input In this example V is used 9 Enter the number of mV per engineering unit in the mV EU field In this example 1000 is used 10 If an offset is specified for the input enter the value in the ...

Страница 68: ... Config window 2 For Filename generation use the default Filename option 3 For Filename use the default name for the data file 4 Leave the Enable Continuous Acquisition checkbox unchecked 5 For Acquisition Duration select 1 second The number of seconds for the total run and the amount of available disk space are shown 6 For X Span Axis select 1 second ...

Страница 69: ...s follows 1 Click the Acquisition tab of the Acquisition Config window 2 For the Per Channel Sampling Frequency text box enter 10000 The sampling rate sample interval and number of scans are displayed 3 For the Trigger Source check box select Software to ensure that the measurement starts as soon as the Record button is clicked ...

Страница 70: ... the F5 key to start the operation Results similar to the following are displayed in the Channel Plot window showing the output of analog output channel 0 as measured by analog input channel 0 Note Many additional options are provided in QuickDAQ for measuring and analyzing the data Refer to the QuickDAQ User s Manual for detailed information ...

Страница 71: ...Part 2 Using Your Module ...

Страница 72: ......

Страница 73: ... Features 76 Analog Output Features 84 Tachometer Input Features 90 General Purpose Counter Timer Features 92 Measure Counter Features 99 Digital I O Features 103 Triggering Acquisition on Multiple Modules 104 Synchronizing Acquisition on Multiple Modules 105 ...

Страница 74: ...Chapter 5 74 Block Diagram Figure 31 shows a block diagram of the DT9857 module and Figure 32 shows a block diagram of the DT9857E module Figure 31 Block Diagram of the DT9857 Module ...

Страница 75: ...Principles of Operation 75 Figure 32 Block Diagram of the DT9857E Module ...

Страница 76: ...ctions Note To maintain simultaneous operation all analog input connections on the DT9857 and DT9857E modules must have the same lead lengths The DT9857 and DT9857E modules use Delta Sigma analog to digital converters ADCs that provide anti aliasing filters based on the clock rate These filters remove aliasing which is a condition where high frequency input components erroneously appear as lower f...

Страница 77: ...input channels is fixed at 24 bits you cannot specify the resolution in software Input Clock Source The DT9857 and DT9857E modules support a 48 MHz internal clock source which is derived from the 24 MHz USB crystal oscillator The same internal 48 MHz clock signal is used for the both the analog input and analog output subsystems For the analog input subsystem use software to specify the internal c...

Страница 78: ...are you specify the analog input channel and the gain that you want to use For the DT9857 8 and DT9857E 8 specify channel 0 to 7 for the DT9857 16 and DT9857E 16 specify channel 0 to 15 The module acquires the data from the specified channel and returns the data immediately For single value operations you cannot specify a clock frequency trigger source scan mode or buffer Single value operations s...

Страница 79: ...gger data when the reference trigger occurs pre trigger data acquisition stops and post trigger acquisition starts at the next sample The sampled data is placed in the allocated buffer s The operation continues until the number of scans that you specify for the post trigger scan count have been acquired at the point the operation stops Note that the sample at which the trigger occurs is not counte...

Страница 80: ...rigger is an event that occurs based on a specified set of conditions If you are using continuous scan mode described on page 79 you must specify a start trigger to start acquisition If you want to acquire pre trigger and post trigger data you must also specify a reference trigger In this case pre trigger data is acquired when the start trigger occurs When the reference trigger occurs pre trigger ...

Страница 81: ... digital TTL trigger for a falling edge external trigger Threshold trigger The start trigger event occurs when the signal attached to a specified analog input channel in the channel list rises above or falls below a user specified threshold value Using software specify the following parameters Start trigger source Specify a positive low to high transition threshold trigger if you want to trigger w...

Страница 82: ...re specify the following parameters Reference trigger source Specify a positive low to high transition threshold trigger if you want to trigger when the signal rises above a threshold level or a negative high to low transition threshold trigger if you want to trigger when the signal falls below a threshold level Threshold channel Specify any one of the analog input channels as the threshold input ...

Страница 83: ...ocated input buffers continuously when no more empty buffers are available the operation stops The data is gap free Note DT9857 and DT9857E modules have a 16 kSample input FIFO that is used to store the acquired data before it is sent to the host Error Conditions DT9857 and DT9857E modules report any overrun errors by sending an overrun event to the application program This event indicates that da...

Страница 84: ...alog output channel list DT9857 and DT9857E modules provide a two pole 120 kHz Butterworth filter and quiet start circuitry to prevent noise from interfering with the output signal The analog output channel powers up to a value of 0 V 10 mV Note The DT9857E 8 xAO DT9857E 16 xAO and their OEM versions are designed without analog output functionality Output Range and Gain DT9857 and DT9857E modules ...

Страница 85: ...y the analog output channel that you want to update and the value to output from that channel The value is output from the specified channel immediately For a single value operation you cannot specify a clock frequency trigger source or buffer Single value operations stop automatically when finished you cannot stop a single value operation Waveform Generation Mode The DT9857 and DT9857E modules su...

Страница 86: ... to the first location of the FIFO and continues outputting the data This process continues indefinitely until you stop it If the waveform pattern is greater than the size of the output FIFO the buffer resides on the host computer When it detects a software trigger the module starts writing output values to the output channels as determined by the output channel list at the specified clock rate us...

Страница 87: ...nnels specified in the output channel list at the specified clock frequency The operation repeats continuously until all the data is output from the buffers or you stop the operation Note Make sure that the host computer transfers data to the output channel list fast enough so that the list does not empty completely otherwise an underrun error results To select continuously paced analog output mod...

Страница 88: ...support the following trigger sources for starting analog output operations Software trigger A software trigger event occurs when you start the analog output operation the computer issues a write to the module to begin conversions Using software specify the trigger source for the D A subsystem as a software trigger External digital TTL trigger For the DT9857 module an external digital TTL trigger ...

Страница 89: ...ify the data encoding as binary Error Conditions DT9857 and DT9857E modules report any underrun errors by sending an underrun event to the application This event indicates that the data buffers are not being sent from the host to the module fast enough and the D A converter ran out of data To avoid this error try one or more of the following Reduce the clock rate of the analog output operation Clo...

Страница 90: ...et to 0 to indicate new data reading the value before the measurement is complete returns an MSB of 1 If the Stale flag is set to Not Used the MSB is always set to 0 When the operation is started the internal 12 MHz counter starts incrementing when it detects the first starting edge of the tachometer input and stops incrementing when it detects the next starting edge at that point the counter stor...

Страница 91: ...eriods per second You can calculate the frequency as follows Frequency 12 MHz Number of counts 1 where 12 MHz is the internal counter timer clock frequency For example if the count is 21 the measured frequency is 600 kHz 12 MHz 20 Period of a signal pulse You can calculate the period as follows Period 1 Frequency Period Number of counts 1 12 MHz where 12 MHz is the internal counter timer clock fre...

Страница 92: ...it general purpose counter timer C T 0 The counter timer accepts a clock input signal and gate input signal and outputs a pulse pulse output signal as shown in Figure 34 Figure 34 Counter Timer Channel Using software specify C T subsystem element 0 to set up the parameters for the general purpose counter timer To read the counter timer specify channel 9 for the DT9857 8 or DT9857E 8 or channel 17 ...

Страница 93: ...terval between edges measure mode If you specify a counter timer in the analog input channel list the A D clock determines how often you want to read the counter value Refer to page 77 for more information about the A D clock Gate Types The edge or level of the counter gate signal determines when a counter timer operation is enabled DT9857 and DT9857E modules provide the following gate types None ...

Страница 94: ... transitions The high portion of the total pulse output period is the active portion of the counter timer pulse output signal You specify the pulse output type 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 hig...

Страница 95: ...ernal and the active gate type as low level or high level Make sure that the signals are wired appropriately Refer to page 53 for an example of connecting an event counting application Up Down Counting Use up down counting mode if you want to increment or decrement the number of rising edges that occur on the counter s clock input depending on the level of the counter s gate signal If the gate sig...

Страница 96: ...e or falling edge to falling edge You can calculate the period as follows Period 1 Frequency Period Number of counts 48 MHz Frequency of a signal pulse the number of periods per second You can calculate the frequency as follows Frequency 48 MHz Number of Counts Using software specify the counter timer mode as edge to edge measurement mode measure the C T clock source as internal the start edge typ...

Страница 97: ...integrity of the signal degrades at frequencies greater than 10 MHz Using software specify the counter timer mode as rate generation rate the C T clock source as either internal or external the clock divider for an internal clock the polarity of the output pulses high to low transition or low to high transition the duty cycle of the output pulses and the active gate type low level or high level Re...

Страница 98: ...tputting it The module continues to output pulses until you stop the operation Note that any gate signals that occur while the pulse is being output are not detected by the module The period of the output pulse is determined by the C T clock source either internal using a clock divider or external Note that in repetitive one shot mode the internal C T clock is more useful than an external clock re...

Страница 99: ... DT9857E 8 module or channel 19 for the DT9857 16 or DT9857E 16 module in the analog input channel list Using software commands you can configure the following parameters for counter 1 and or counter 2 The operation mode as continuous edge to edge measurement mode The signal that starts the measurement The following signals are supported A D conversion complete Tachometer input falling edge Tachom...

Страница 100: ... 0 Gate input rising edge When the selected start edge is the same as the selected stop edge the internal 48 MHz counter starts incrementing when it detects the first start edge of the selected input signal and stops incrementing when it detects the selected stop edge which is the same as the start edge in this case at that point the counter stores and resets the count The stored count is maintain...

Страница 101: ...d then a new count value is stored as each period measurement completes When an input subsystem sample occurs the most recently stored measure count is written into the input data stream A data pipeline is used in the hardware to compensate for the A D group delay and synchronizes the value of the measure counters with the analog input measurements so that all measurements are correlated in time T...

Страница 102: ...count is 201 the measured frequency is 240 kHz 48 MHz 200 Period between the start and stop signals edges You can calculate the period as follows Period 1 Frequency Period Number of counts 1 48 MHz where 48 MHz is the internal measure counter frequency Pulse width of the start and stop signal edges rising to falling edge or falling edge to rising edge You can calculate the period as follows Pulse ...

Страница 103: ... You use software to specify the digital I O port and a gain of 1 the gain is ignored Data is then read from or written to all the digital I O lines For a single value operation you cannot specify a clock or trigger source Single value operations stop automatically when finished you cannot stop a single value operation Continuous digital input takes full advantage of the capabilities of the DT9857...

Страница 104: ... subsystems on the module You can start acquisition on multiple modules by connecting all modules to a shared external trigger input as shown in Figure 36 When triggered the modules start acquiring data at the same time Using this connection scheme the measurements of one module may not be synchronous with the measurements of another module due to logic delays in the clocking and USB circuitry Fig...

Страница 105: ...ce the Sync Bus is used as the start trigger When configured as none the default mode the DT9857 module uses the 48 MHz reference clock instead of the Sync Bus connector The synchronization mode remains set until changed or until the application exits You can connect multiple modules in one of two ways Figure 37 shows how to connect a maximum of two DT9857 modules by daisy chaining them together t...

Страница 106: ...ck skew the master module must be less than 4 inches away from the RJ45 distribution panel Master Analog Input Subsystem Settings Synchronization Mode is Master Start Trigger can be Software External Digital Trigger or Threshold Trigger Reference Trigger can be External Digital Trigger or Threshold Trigger If using a reference trigger set up the post trigger scan count for the master Slave Analog ...

Страница 107: ...the master and the slaves Note that you can set the clock rate to be the same or different on each module but correlation of the data will be difficult if the clock rates are not the same or are not multiples of each other Note It is important that you start the slave modules first followed by the master module so that the slave receives the appropriate clock and trigger signals from the master If...

Страница 108: ... Ain Sync Bus connector B or D on one module to the Ain Sync Bus connector B or D on the next module If you want to synchronize the analog output channels on multiple modules you must connect a cable from the Ain Sync Bus connector B or D on one module to the Ain Sync Bus connector B or D on the next module and then connect a cable from the DA Out Sync Bus connector A or C on one module to the DA ...

Страница 109: ...from each other however the same device cannot have one subsystem configured as the master and the other subsystem configured as the slave or an error will be reported When configured as a master the Sync Bus connector outputs trigger and clock signals When configured as a slave the Sync Bus connector accepts trigger and clock signals from the master the start trigger source on the slave module in...

Страница 110: ...ger can be External Digital Trigger or Threshold Trigger If using a reference trigger set up the post trigger scan count for the master Slave Analog Input Subsystem Settings Synchronization Mode is Slave Start Trigger is ignored Sync Bus is used Reference Trigger is Sync Bus If using a reference trigger set up the post trigger scan count for the slave Device Under Test Inputs Inputs Inputs Inputs ...

Страница 111: ... by the Ain Sync connectors DT9857E Master 1 Ain Sync Bus USB Port 2 DT9857E Slave 2 USB 3 0 HUB USB Port 1 DT9857E Slave 3 DT9857E Slave 4 USB Port 3 USB Port 4 Ain Sync Bus USB USB USB USB Master Analog Output Subsystem Settings Synchronization Mode is Master Trigger Source can be Software or External Digital Trigger Slave Analog Output Subsystem Settings Synchronization Mode is Slave Trigger so...

Страница 112: ... the clock rate to be the same or different on each module but correlation of the data will be difficult if the clock rates are not the same or are not multiples of each other Note It is important that you start the slave modules first followed by the master module so that the slave receives the appropriate clock and trigger signals from the master If you start the master module before the slaves ...

Страница 113: ...ed Scan Mode 116 Data Encoding 116 Channels 117 Gain 117 Ranges 118 Resolution 118 Current and Resistance Support 118 Thermocouple RTD and Thermistor Support 119 IEPE Support 120 Bridge and Strain Gage Support 120 Start Triggers 121 Reference Triggers 122 Clocks 123 Counter Timers 124 Tachometers 125 ...

Страница 114: ...ties A description of each capability is followed by the property used to describe that capability in the DT Open Layers for NET Class Library Note The following tables include the capabilities that can be queried However some capabilities may not be supported by your device Blank fields represent unsupported options For more information refer to the description of these properties in the DT Open ...

Страница 115: ...og output operations in addition to waveform mode Simultaneous Start List Support SupportsSimultaneousStart Yesg g DT9857 and DT9857E modules support the ability to start continuous A D and continuous D A operations simultaneously Yesf Supports Programmable Synchronization Modes SupportsSynchronization Yesh h You can synchronize input data from multiple devices if the A D subsystem of one module i...

Страница 116: ...Options DT9857 and DT9847E A D D A DIN DOUT C T TACH QUAD Triggered Scan Support SupportsTriggeredScan Maximum Number of CGL Scans per Trigger MaxMultiScanCount 1 0 0 0 0 0 Maximum Retrigger Frequency MaxRetriggerFreq 0 0 0 0 0 0 Minimum Retrigger Frequency MinRetriggerFreq 0 0 0 0 0 0 Table 9 Data Encoding Options DT9857 and DT9857E A D D Aa a The DT9857E 8 xAO DT9857E 16 xAO and their OEM versio...

Страница 117: ...analog output channels 0 and 1 and the digital output port channel 2 1 1 3d d C T 0 is the general purpose counter timer and C T 1 and C T 2 are the measure counters 1 SE Support SupportsSingleEnded Yes Yes SE Channels MaxSingleEndedChannels 8 or 16a 2b DI Support SupportsDifferential DI Channels MaxDifferentialChannels 0 0 Maximum Channel Gain List Depth CGLDepth 13 or 21a 3b Simultaneous Sample ...

Страница 118: ...ortsCurrentOutput Table 13 Resolution Options DT9857 and DT9857E A D D Aa a The DT9857E 8 xAO DT9857E 16 xAO and their OEM versions do not support the analog output D A subsystem DIN DOUT C T TACH QUAD Software Programmable Resolution SupportsSoftwareResolution Number of Resolutions NumberOfResolutions 1 1 1 1 Available Resolutions SupportedResolutions 24 32 8 8 32 31 Table 14 Current and Resistan...

Страница 119: ...tor Support SupportsThermistor Voltage Converted to Temperature SupportsTemperatureDataInStream Supported Thermocouple Types ThermocoupleType Supports CJC Source Internally in Hardware SupportsCjcSourceInternal Supports CJC Channel SupportsCjcSourceChannel Available CJC Channels CjcChannel Supports Interleaved CJC Values in Data Stream SupportsInterleavedCjcTemperaturesInStream Supported RTD Types...

Страница 120: ...ation Current Source Values SupportedExcitationCurrentValues 004 A Table 17 Bridge and Strain Gage Support Options DT9857 and DT9857E A D D A DIN DOUT C T TACH QUAD Bridge Support SupportsBridge Supported Bridge Configurations BridgeConfiguration Strain Gage Support SupportsStrainGage Supported Strain Gage Bridge Configurations StrainGageBridgeConfiguration External Excitation Voltage SupportsExte...

Страница 121: ...xternal Negative TTL Trigger Support for Single Value Operations SupportsSvNegExternalTTLTrigger Positive Threshold Trigger Support SupportsPosThresholdTrigger Yesf f If you choose a threshold trigger you can program the threshold level as a value between 10 V gain of 1 or 1 V gain of 10 You can use any of the analog input channels as the threshold channel channel 0 to 7 on the DT9857 8 or DT9857E...

Страница 122: ...u can program the threshold level as a value between 10 V for a gain of 1 or 1 V for a gain of 10 and any of the supported analog input channels can be used as the threshold channel If you choose a threshold trigger as both the start trigger and the reference trigger the threshold channel and threshold level must be the same The polarity of the trigger positive or negative going can be different f...

Страница 123: ...timer 0 Yes Simultaneous Input Output on a Single Clock Signal SupportsSimultaneousClocking Yes Base Clock Frequency BaseClockFrequency 27 MHzc c A 48 MHz reference clock is used to generate the base clock frequency 27 MHzb 0 0 48 MHz 12 MHz Maximum Clock Divider MaxExtClockDivider 1 0 1 0 1 0 1 0 4 294 967 296 1 0 Minimum Clock Divider MinExtClockDivider 1 0 1 0 1 0 1 0 2 1 0 Maximum Frequency Ma...

Страница 124: ...e Support SupportsContinuousMeasure Yes High to Low Output Pulse Support SupportsHighToLowPulse Yesa Low to High Output Pulse Support SupportsLowToHighPulse Yesa Variable Pulse Width Support SupportsVariablePulseWidth Yesb None internal Gate Type Support SupportsGateNone Yesa High Level Gate Type Support SupportsGateHighLevel Yesa c Low Level Gate Type Support SupportsGateLowLevel Yesa c High Edge...

Страница 125: ...tRisinge Interrupt Driven Operations SupportsInterrupt a Supported for the general purpose counter C T 0 only b In one shot mode and repetitive one shot mode the duty cycle is set to 100 automatically c High edge and low edge are supported for one shot and repetitive one shot modes High level and low level are supported for event counting up down counting edge to edge measurement continuous edge t...

Страница 126: ...Chapter 6 126 ...

Страница 127: ...127 7 Troubleshooting General Checklist 128 Technical Support 130 If Your Module Needs Factory Service 131 ...

Страница 128: ...o page 130 Table 23 Troubleshooting Problems Symptom Possible Cause Possible Solution Module is not recognized You plugged the module into your computer before installing the device driver From the Control Panel System Hardware Device Manager uninstall any unknown devices showing a yellow question mark Then run the setup program on your OMNI CD to install the USB device drivers and reconnect your ...

Страница 129: ...s while the transducers are wired as single ended inputs or vice versa Check your wiring and ensure that what you specify in software matches your hardware configuration see the instructions in Chapter 3 The module is out of calibration DT9857 and DT9857E modules are calibrated at the factory If you want to readjust the calibration of the analog input or analog output circuitry refer to Chapter 8 ...

Страница 130: ... www mccdaq com and click on the Support link When requesting technical support be prepared to provide the following information Your product serial number The hardware software product you need help on The version of the OMNI CD you are using Your contract number if applicable If you are located outside the USA contact your local distributor see our web site www mccdaq com for the name and teleph...

Страница 131: ...to factory specifications An RMA must be obtained from Applications Engineering in advance of sending any product back to Measurement Computing Customers outside the USA must contact their local distributor for a return procedure Calibration certificates for analog models can be obtained for a fee certificate must be requested at time of RMA assignment ...

Страница 132: ...Chapter 7 132 ...

Страница 133: ...133 8 Calibration Using the Calibration Utility 135 Calibrating the Analog Input Subsystem 136 Calibrating the Analog Output Subsystem 139 ...

Страница 134: ...ration of the analog input and analog output circuitry every six months using the DT9857 Calibration Utility Note Ensure that you installed the device driver for your module using the Data Acquisition OMNI CD prior to using the calibration utility This chapter describes how to calibrate the analog input and output subsystems of a DT9857 or DT9857E module using the calibration utility ...

Страница 135: ...57E module select Programs Data Translation Inc Calibration DT9857 Calibration Utility The main window of the DT9857 Calibration Utility appears Once the calibration utility is running you can calibrate the analog input circuitry either automatically or manually described on page 136 or the analog output circuitry of the module described on page 139 ...

Страница 136: ...wo power modes low power mode and high power mode Low power mode is calibrated when you specify a sampling frequency less than 52 734 kHz High power mode is calibrated when you specify a sampling frequency greater than 52 734 kHz Ensure that you calibrate the board for both high and low power mode if you are using sampling frequencies below and above 52 734 kHz By default this utility uses DC coup...

Страница 137: ...nd above 52 734 kHz By default this utility uses DC coupling with the current source disabled This is the recommended setting for most users While changing these settings is not advised for most users users with unique applications can change these settings by clicking the Advanced button 3 Under the Manual Calibration area of the window select the channel that you want to calibrate and then click...

Страница 138: ...store Factory Settings to reset the A D calibration values to their original factory settings This process will undo any auto or manual calibration settings Once you have finished this procedure continue with Calibrating the Analog Output Subsystem ...

Страница 139: ...In the DAC Output Voltage box select 0 V 6 Under the Calibration Controls area of the window adjust the offset by entering values between 0 and 255 in the DAC Offset edit box or by clicking the up down buttons until the voltmeter reads 0 V 7 In the DAC Output Voltage box select 9 375 V 8 Under the Calibration Controls area of the window adjust the gain by entering values between 0 and 255 in the D...

Страница 140: ...Chapter 8 140 ...

Страница 141: ...er Input Specifications 151 Measure Counter Specifications 152 General Purpose Counter Timer Specifications 153 Trigger Specifications 154 Master Oscillator Specifications 155 Power Physical and Environmental Specifications 156 Regulatory Specifications 157 Connector Specifications 158 External Power Supply Specifications 159 ...

Страница 142: ...00 kHz to 27 MHz 512 x sample frequency 256 x sample frequency 100 kHz to 27 MHz 512 x sample frequency 256 x sample frequency Group delay 39 sample rate in seconds 39 sample rate in seconds ADC Delta Sigma filtera Passband 3 dB Passband ripple 0 005 dB Stopband 100 dB 0 49 x sample frequency Hz 0 453 x sample frequency Hz 0 547 x sample frequency Hz 0 49 x sample frequency Hz 0 453 x sample frequ...

Страница 143: ...kSPS 1 dBFS input 6 dBFS input 98 dB 94 dB 96 dB 91 dB 98 dB 94 dB 97 dB 93 dB Total Harmonic Distortion THDi 1 kHz input 105 5 kSPS 1 dBFS input 6 dBFS input 96 dB 104 dB 96 dB 101 dB 104 dB 110 dB 103 dB 109 dB Spurious Free Dynamic Range SFDRj 1 kHz input 105 5 kSPS 1 dBFS input 6 dBFS input 98 dBFS 110 dBFS 98 dBFS 109 dBFS 105 dBFS 118 dBFS 105 dBFS 118 dBFS Noise Floor 50 input termination 1...

Страница 144: ...Noise and Distortion SINAD is the ratio of the RMS value of the input signal to the RMS sum of all other spectral components excluding DC h Signal to Noise Ratio SNR is the ratio of the RMS value of the input signal to the RMS sum of all other spectral components excluding harmonics and DC i Total Harmonic Distortion THD is the ratio of the RMS value of the input signal to the RMS sum of all harmo...

Страница 145: ...9857 module as measured by QuickDAQ In this example a 1 dB input signal is connected to the DT9857 module and is sampled at 105 469 kHz using a gain of 1 The effective number of bits ENOB is 15 54 Figure 42 Dynamic Performance of the DT9857 Module Measured Using QuickDAQ ...

Страница 146: ...e noise performance of the DT9857 module using QuickDAQ In this example the input channel was shorted with 50 and sampled at 105 469 kHz using a gain of 1 The noise is 52 VRMS Figure 43 Noise Level of the DT9857 Measured Using QuickDAQ ...

Страница 147: ...sponse of the DT9857 and DT9857E modules using a sampling rate of 48 kS s Figure 44 Analog Input Passband Response of the DT9857 and DT9857E Modules 1 0 8 0 6 0 4 0 2 0 0 2 0 5 10 15 20 25 dB Frequency kHz DT9857 and DT9857E Analog Input PassbandResponse Fs 48 kSPS ...

Страница 148: ...lock range Sampling Frequency 30 kHz to 54 kHz 54 kHz to 108 kHz 108 kHz to 216 kHz 13 824 MHz to 27 648 MHz 512 x sample frequency 256 x sample frequency 128 x sample frequency Group delay typical 36 sample rate in seconds DAC Delta Sigma filterb Passband 3 dB Passband ripple 0 005 dB Stopband Stopband attenuation 100 dB Stopband attenuation 95 dB Stopband attenuation 90 dB 0 49 x sample frequenc...

Страница 149: ...emoved external power fails USB power is reset or the system is rebooted ESD protection Arc Contact 8 kV 4 kV a The DT9857E 8 xAO DT9857E 16 xAO and their OEM versions do not support the analog output D A subsystem b The total frequency response is the combined frequency response of the DAC Delta Sigma filter and the analog filter c THD and SFDR measurements were made with a 16384 point FFT with a...

Страница 150: ... 5 V tolerant Logic sense Positive true Inputs Input type Input logic load High input voltage Low input voltage Low input current Termination Level sensitive 1 LVTTL 2 0 V minimum 0 8 V maximum 0 2 mA maximum 22 k pull up to 3 3 V Outputs Output type High output Low output High output current Low output current Short circuit protected LVTTL 2 4 V minimum 0 4 V maximum 10 mA maximum 4 mA maximum 33...

Страница 151: ...ecifications Number of channels 1 Resolution 31 bits per channel Input voltage range 30 V Threshold voltage 2 V with 0 5 V hysteresis Input termination None Maximum input frequency 1 MHza a Limited by signal integrity and input signal conditioning Minimum pulse width high low minimum amount of time it takes a C T to recognize an input pulse 0 4 s Clock frequency for tachometer measurements 12 MHz ...

Страница 152: ...nnel Clock frequency for measurement counters 48 MHz 20 8 ns resolution Maximum input frequency 10 MHza a Limited by signal integrity and input signal conditioning Minimum pulse width high low 50 ns 0 4 s if the tachometer input is used for the starting edge and stopping edge Start and stop signals edges A D conversion complete Tachometer input falling or rising edge Digital inputs 0 to 7 falling ...

Страница 153: ...lock output Minimum Maximum 0 0112 Hz 24 MHz Maximum clock or gate input frequency 24 MHza a The integrity of the signal degrades at frequencies greater than 10 MHz Minimum pulse width minimum amount of time it takes a C T to recognize an input pulse 50 ns Input voltage range 0 to 3 3 V 5 V tolerance Inputs Input logic load High input voltage Low input voltage Low input current Input termination 1...

Страница 154: ...ernal trigger digital Input type Input termination Logic family Input logic load Lower threshold Upper threshold Hysteresis Input sink current Minimum pulse width high low Maximum input signal Edge sensitive rising or falling edge trigger software selectable None LVTTL inputs 1 LVTTL 1 1 V 1 3 V 0 2 V 33 A 250 ns 30 V Threshold trigger Type Threshold level Hysteresis Rising or falling edge thresho...

Страница 155: ... D and D A subsystems are independently programmable and are derived from the same 48 MHz reference clock Therefore it is possible to establish a fixed relationship between the A D and D A subsystem sample frequencies including setting them to the same frequency 30 kHz to 105 469 kHz However the subsystems are not designed to be synchronous with each other Accuracy at 25 C 30 ppm Drift over temper...

Страница 156: ...2 g 17 2 oz 5 473 in 139 mm 9 187 in 233 3 mm 0 063 in 1 6 mm 800 g 28 2 oz Physical Dimensions DT9857E Enclosure Length Width Height Weight of DT9857 8 Weight of DT9857 16 Rack mountable in 19 x 1U rack with EP402 kit 8 795 in 223 4 mm 9 719 in 246 9 mm 1 72 in 43 7 mm 1155 g 40 8 oz 1475 5 g 52 0 oz Physical Dimensions DT9857E OEM board only Length of Bottom Board Width of Bottom Board Thickness...

Страница 157: ...6 Electrical Equipment for Measurement Control and Laboratory Use EMC Requirements EN61000 4 2 2009 Electrostatic Discharge ESD 4 kV contact discharge 8 kV air discharge 4 kV horizontal and vertical coupling planes EN61000 4 3 2006 Radiated electromagnetic fields 3 V m 80 to 1000 MHz 3 V m 1 4 GHz to 2 GHz 1 V m 2 GHz to 2 7 GHz EN61000 4 4 2004 Electrical Fast Transient Burst EFT 1 kV on data cab...

Страница 158: ...55 3 position header Kycon KPPX 4P Kycon KPPX 4P Phoenix Contact 1757022 Sync Bus connector RJ45 On the DT9857 On the DT9857E Molex part number 44661 0001 TE Connectivity 5569255 1 USB connectora a The standard version of the DT9857 and DT9857E modules supports an optional locking USB cable the OEM version does not support a locking USB cable You can purchase a locking USB cable separately from ve...

Страница 159: ...l Power Supply Feature Specifications Type Total Power medical power supply TPEMG24 S050400 7 Input voltage Typical 90 264 V AC Input current Typical 0 347 A at 115 V AC 0 215 A at 230 V AC Frequency 47 to 63 Hz Inrush current 6 274 A RMS at 230 V AC Output voltage 5 V DC Output current 4 0 A Output wattage Typical 20 24 W Noise and ripple 1 peak to peak Regulatory specifications UL ITE CE FCC Cla...

Страница 160: ... is used with the DT9857E module Table 36 Specifications for the External Power Supply Used with the DT9857E Module Feature Specifications Output voltage 4 75 VDC to 28 VDC Output current 5 V 12 V 28 V 1 56 A with 4 A surge capability 0 62 A 0 29 A Noise and ripple 50 mV peak to peak ...

Страница 161: ...ors Analog Input Connectors 162 Analog Output Connectors 163 Tachometer Connector DT9857 Only 164 Digital Connector 166 External USB Connector 167 External Power Connectors 168 Sync Bus Connector 171 STP25 Screw Terminal Panel 174 LED Status Indicators 176 ...

Страница 162: ...dix B 162 Analog Input Connectors Figure 45 shows the layout of the analog input connectors on the DT9857 and DT9857E modules Figure 45 Analog Input Connectors Channel n Analog In Channel n Analog In Return ...

Страница 163: ...gure 46 shows the layout of the analog output connectors on the DT9857 and DT9857E modules Figure 46 Analog Output Connectors Note The DT9857E 8 xAO DT9857E 16 xAO and their OEM versions are designed without analog output functionality Channel n Analog Out Channel n Analog Out Return ...

Страница 164: ...y Figure 47 shows the layout of the tachometer connector on the DT9857 module Note that on the DT9857E the tachometer input is provided on pin 11 of the Digital connector Figure 47 Tachometer Connector DT9857 Only Tachometer In Tachometer In Return ...

Страница 165: ...ly Figure 48 shows the layout of the external digital TTL connector on the DT9857E module Note that on the DT9857 the external digital TTL input is provided on pin 11 of the Digital connector Figure 48 External Trigger Connector DT9857E Module Only External Trigger In External Trigger In Return ...

Страница 166: ...escription Connector Pin Number Signal Description 1 Digital Input 0 14 C T 0 Clock 2 Digital Input 1 15 C T 0 Out 3 Digital Input 2 16 Digital Ground 4 Digital Input 3 17 Digital Output 0 5 Digital Ground 18 Digital Output 1 6 Digital Input 4 19 Digital Output 2 7 Digital Input 5 20 Digital Output 3 8 Digital Input 6 21 Digital Ground 9 Digital Input 7 22 Digital Output 4 10 Digital Ground 23 Dig...

Страница 167: ... the DT9857 and DT9857E modules Figure 50 Layout of the USB Connector Table 38 lists the pin assignments for the USB connector on the DT9857 and DT9857E modules Table 38 Pin Assignments for the USB Connector Connector Pin Number Signal Description Connector Pin Number Signal Description 1 USB 5 V 3 USB Data 2 USB Data 4 USB Ground 1 2 3 4 ...

Страница 168: ...cts to the DIN connector Figure 51 shows the layout of the DIN power connector Refer to page 158 for detailed specifications of the EP361 power supply Figure 51 Layout of the DIN Power Connector Table 39 lists the pin assignments for the DIN power connector on the DT9857 module Table 39 Pin Assignments for the DIN Power Connector on the DT9857 Module Connector Pin Numbera a The outer shell of the ...

Страница 169: ...r and a 3 position Phoenix header Figure 52 shows the layout of the DIN power connector Figure 52 Layout of the DIN Power Connector Table 40 lists the pin assignments for the DIN power connector on the DT9857E module Table 40 Pin Assignments for the DIN Power Connector on the DT9857E Module Connector Pin Numbera a The outer shell of the connector provides cable shield to chassis ground Signal Desc...

Страница 170: ...assignments for the 3 position header on the DT9857E module Note that you must connect an external power supply to this header that meets the specifications described on page 160 Table 41 Terminal Assignments for the 3 Position Header on the DT9857E Module Terminal Number Signal Description 1 4 75 VDC to 28 VDC 2 Ground 3 Chassis Ground Terminal 3 Terminal 2 Terminal 1 ...

Страница 171: ...gure 54 shows the Sync Bus RJ45 connector on the DT9857 module Figure 54 Sync Bus RJ45 Connector Table 42 lists the pin assignments for the Sync Bus connector on the DT9857 module Table 42 Sync Bus Connector Pin Assignments Pin Description 1 48 MHz Reference Clock 2 48 MHz Reference Clock 3 Input Subsystem Trigger 4 Sync 5 Sync 6 Input Subsystem Trigger 7 Output Subsystem Trigger 8 Output Subsyste...

Страница 172: ...r on the next module If you want to synchronize the analog output channels on multiple modules you must connect a cable from the Ain Sync Bus connector B or D on one module to the Ain Sync Bus connector B or D on the next module and then connect a cable from the DA Out Sync Bus connector A or C on one module to the DA Out Sync Bus connector A or C on the next module Note The Ain Sync Bus connector...

Страница 173: ...fer to page 108 for more information on synchronizing multiple modules Table 43 Sync Bus Connector Pin Assignments Pin Description 1 48 MHz Reference Clock 2 48 MHz Reference Clock 3 A D Trigger 4 A D Sync 5 A A Sync 6 A D Trigger 7 A D Master Clock 8 A D Master Clock Table 44 Sync Bus Connector Pin Assignments Pin Description 1 Not Connected 2 Not Connected 3 D A Trigger 4 D A Sync 5 D A Sync 6 D...

Страница 174: ... TB1 The 25 pin connector provides access to the signals from the Digital connector on the DT9857 and DT9857E modules Figure 56 shows the layout of the STP25 screw terminal panel Figure 56 Layout of the STP25 Screw Terminal Panel Table 45 lists the screw terminal assignments for the STP25 screw terminal panel ...

Страница 175: ...20 Digital Output 3 19 Digital Output 2 18 Digital Output 1 17 Digital Output 0 16 Digital Ground 15 C T Out 14 C T Clock 13 Event Outa a Currently the event output function is disabled and the output is driven low 12 C T Gate 11 External Trigger on the DT9857 Tachometer Input on the DT9857E 10 Digital Ground 9 Digital Input 7 8 Digital Input 6 7 Digital Input 5 6 Digital Input 4 5 Digital Ground ...

Страница 176: ...le The DT9857 module has LED indicators on the front and rear panels Figure 57 shows the LEDs on the front panel of the DT9857 module Figure 58 shows the LEDs on the rear panel of the DT9857 module Figure 57 LEDs on the Front Panel of the DT9857 Module Figure 58 LEDs on the Rear Panel of the DT9857 Module Input Trigger LED Output Trigger LED Power LED USB LED ...

Страница 177: ...el Top Solid amber Output subsystem armed it is waiting for an external digital trigger threshold trigger or Sync Bus trigger the module must have been configured for one of these trigger types Solid green Output subsystem has been triggered Power LED Off Power off Rear Panel Bottom Solid green Power on requires both the USB cable and the external power to be plugged in as the module is held in re...

Страница 178: ...ure 59 shows the LEDs on the front panel of the DT9857E module Figure 60 shows the LEDs on the rear panel of the DT9857E module Figure 59 LEDs on the Front Panel of the DT9857E Module Figure 60 LEDs on the Rear Panel of the DT9857E Module These LEDs are described in Table 47 Input Trigger LED Output Trigger LED Power LED USB LED ...

Страница 179: ...red Output Trigger LED Off Idle Front Panel Solid amber Output subsystem armed it is waiting for an external digital trigger threshold trigger or Sync Bus trigger the module must have been configured for one of these trigger types Solid green Output subsystem has been triggered Power LED Off Power off Front Panel Solid green Power on requires both the USB cable and the external power to be plugged...

Страница 180: ...Appendix B 180 ...

Страница 181: ...181 C Register Level Programming Writing to the EEPROM Register 182 ...

Страница 182: ...cations programmatically use the olDiagReadReg and olDiagWriteReg functions The following code shows the location of these controls in the register map define I2C_MEM_BASE 0x00000000 Coupling storage offsets relative to the base address for the analog input channels define EEPROM_OFFSET_COUPLING 0x0020 define EEPROM_OFFSET_COUPLING_END 0x002F Current source storage offsets relative to the base add...

Страница 183: ...EEPROM_OFFSET_SYNC_TERMINATION syncBusTermination 1 The parameters of these commands are defined as follows m_hDev is the handle to the device that is being opened channelNumber is the A D channel whose EEPROM location is to be updated couplingType is either COUPLING_TYPE_AC for AC coupling or COUPLING_TYPE_DC for DC coupling currentSource is either EXCITATION_CURRENT_SRC_INTERNAL to enable the in...

Страница 184: ...Appendix C 184 ...

Страница 185: ...ations 148 waveform generation mode 85 wiring 49 analog output connectors 163 analog threshold trigger 89 applet Open Layers Control Panel 129 application wiring analog inputs 48 analog output 49 continuous edge to edge measurement 57 edge to edge measurement 56 event counting 53 measure counters 59 period measurement 55 pulse output 58 pulse width measurement 55 tachometer input 50 up down counti...

Страница 186: ...mode 96 124 wiring 57 continuous scan mode 79 Control Panel applet 129 conversion modes continuous analog input 79 continuous analog output 87 digital I O 103 single value analog input 78 single value analog output 85 single values analog input 78 waveform generation mode 85 conversion rate 79 counter timer channels 92 117 clock sources 93 123 clock falling edge type 124 clock rising edge type 124...

Страница 187: ...83 89 environmental specifications 156 EP361 power supply 32 33 EP365 34 EP386 panel 23 105 106 EP402 Rack Mount Kit 23 EP403 cable 22 errors analog input 83 analog output 89 event counting 95 124 wiring 53 excitation current source 77 available 120 internal 120 expansion hub 35 external clock 93 123 external clock divider maximum 123 minimum 123 external digital trigger 81 82 88 negative TTL 121 ...

Страница 188: ...ialChannels 117 MaxExtClockDivider 123 MaxFrequency 123 MaxMultiScanCount 116 MaxRetriggerFreq 116 MaxSingleEndedChannels 117 measure counters features 99 wiring 59 measuring pulses 96 MinExtClockDivider 123 MinFrequency 123 MinRetriggerFreq 116 muting the output voltage 115 N negative threshold trigger 121 122 number of differential channels 117 gains 117 I O channels 117 resolutions 118 scans pe...

Страница 189: ...mming 182 regulatory specifications 157 repetitive one shot pulse output 98 124 resolution analog input 77 analog output 84 available 118 digital I O 103 number of 118 retrigger clock frequency 116 returning boards to the factory 131 RJ45 connector 171 RMA 131 S sample clock 77 scan count 122 screw terminal panel layout 47 SDK 21 simultaneous clocking 123 simultaneous sample and hold support 117 s...

Страница 190: ...portsPosThresholdTrigger 121 122 SupportsPostTriggerScanCount 122 SupportsProgrammableGain 117 SupportsRateGenerate 124 SupportsRisingEdge 125 SupportsSimultaneousClocking 123 SupportsSimultaneousSampleHold 117 SupportsSimultaneousStart 115 SupportsSingleEnded 117 SupportsSingleValue 115 SupportsSoftwareTrigger 121 SupportsStaleDataFlag 125 SupportsSyncBusTrigger 122 SupportsSynchronization 115 Su...

Страница 191: ... 35 USB LED 35 37 177 179 V variable pulse width 124 Visual Basic for NET programs 20 Visual C programs 20 voltage ranges 76 118 number of 118 W warm up time 43 136 wiring signals 43 analog inputs 48 analog output 49 continuous edge to edge measurement 57 edge to edge measurement 56 event counting 53 measure counters 59 period measurement 55 preparing 43 pulse output 58 pulse width measurement 55 ...

Страница 192: ...Index 192 ...

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