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JYTEK PCI-69524 User Manual

24-bit precision load cell input card
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PCI-69524
24-Bit Precision Load Cell Input Card
User's Manual
Manual Revision: 1.00
Revision Date:
Aug.26, 2017
Advance Technologies; Automate the World.

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Summary of Contents for JYTEK PCI-69524

  • Page 1 PCI-69524 24-Bit Precision Load Cell Input Card User’s Manual Manual Revision: 1.00 Revision Date: Aug.26, 2017 Advance Technologies; Automate the World.

  • Page 3: Preface

    Restriction of Hazardous Substances (RoHS) directive and Waste Electri- cal and Electronic Equipment (WEEE) directive. Environmental protec- tion is a top priority for JYTEK. We have enforced measures to ensure that our products, manufacturing processes, components, and raw materials have as little impact on the environment as possible. When...
  • Page 4 ® Microsoft Corporation. PCI™, is a registered trademark of the Peripheral Component Interconnect Special Interest Group (PCI-SIG). Product names mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies. Preface...
  • Page 5 Using this Manual Audience and Scope The PCI-69524 User’s Manual is intended for hardware technicians and systems operators with knowledge of installing, configuring and operating industrial grade PCI cards. Manual Organization This manual is organized as follows: Preface: Presents important copyright notifications, disclaimers,...
  • Page 6 Conventions Take note of the following conventions used throughout this manual to make sure that users perform certain tasks and instructions properly. Additional information, aids, and tips that help users perform tasks. NOTE: NOTE: Information to prevent minor physical injury, component damage, data loss, and/or program corruption when trying to complete a task.

  • Page 7: Table Of Contents

    Analog Input Signal Connections ..........33 3.2.1 Signal Sources..............33 3.2.2 Input Configurations............33 3.3.1 Signal Sources and Terminal Devices.........38 3.3.2 Connecting to/from External Encoders ......40 3.3.5 Interfacing Isolated DI with External Devices ....45 4 Operation Theory..............47 PCI-69524 Function Diagram ............47 Table of Contents...
  • Page 8 Analog Input Channels..............48 4.2.1 Signal Acquisition and Processing Flow......48 4.2.2 How to Define a 1 in 200,000 Count Resolution ....49 4.2.3 Data Rate versus Sampling Rate........51 4.2.4 Auto-scan, Multiplexing and Settling Time ....... 51 4.2.5 Power Line Noise Rejection..........53 4.2.6 Excitation and Remote-sensing.........
  • Page 9 Warranty Policy ................77 Getting Service................79 Table of Contents...
  • Page 10 This page intentionally left blank. Table of Contents...

  • Page 11: List Of Figures

    Figure 1-8:Frequency Response Sampling at 30,000 SPS ......12 Figure 1-9:Frequency Response Sampling at 15,000 SPS ......12 Figure 1-10:Frequency Response Sampling below 15,000 SPS .....13 Figure 2-1:PCI-69524 PCB Layout and Mechanical Drawing......23 Figure 3-1:CN1 Connector & Pin Assignments..........28 Figure 3-2:CN2 Connector & Pin Assignments..........29 Figure 3-3:SSI Connector &...
  • Page 12 Figure 3-17:Connecting to a low-side push button ........45 Figure 3-18:Connecting to an external sink driver ........46 Figure 4-1:PCI-69524 Function Diagram ............47 Figure 4-2:Signal acquisition and data processing flow for transducer input channels..........48 Figure 4-3:SINC Filter Power Line Noise Rejection at 60 Hz Multiples ..............
  • Page 13 List of Tables Table 1-1:-3dB small signal bandwidth: (Typical, 25°C) ........4 Table 1-2:System Noise (including Quantization, Typical, 25°C) ....4 Table 1-3:Transducer Input Impedance............5 Table 1-4:Transducer CMRR (DC to 60 Hz, Typical 25°C)........5 Table 1-5:Settling Error: (Typical, 25°C)............6 Table 1-6:Programmable input range and gain ..........7 Table 1-7:-3dB small signal bandwidth vs.
  • Page 14 This page intentionally left blank. List of Tables...

  • Page 15: Introduction

    30 kS/s sampling rate, providing 4-CH load-cell trans- ducer input channels, and 4-CH general purpose analog input. In addi- tion, the PCI-69524 comes with a 2-CH 16-bit analog output, isolated motion I/O and digital I/O. The highly integrated function makes the PCI- 69524 the ideal solution for combined data acquisition and motion con- trol functionalities.

  • Page 16: Features

    Features PCI-69524 24-bit multifunction DAQ card provides the following advanced features: Supports 32-bit 3.3 V or 5V PCI bus  Load-cell transducer input channels  4-CH differential analog input with remote-sense  4-CH transducer excitation, 10 V or 2.5 V selectable ...

  • Page 17: Specifications

    Specifications Analog Input (AI) for Transducers Number of channels: (programmable)  4 differential inputs (DI)  A/D converter:  ADS1255  Maximum sampling rate:  Without Auto-zero 30,000 samples/s (single channel)  1,638 samples/s (multiplexed/scanning)  With Auto-zero 819 samples/s (single channel or multiplexed/scanning) ...

  • Page 18: Table 1-1:-3Db Small Signal Bandwidth: (Typical, 25°C)

    Remote-sense inputs: Power on: -40 V to +55 V (continuous)  Power off: -40 V to +55 V (continuous)  FIFO buffer size: 1024 samples (1024 x 32 bits)  Data transfers:  Programmed I/O  Bus-mastering DMA with scatter/gather ...

  • Page 19: Table 1-3:Transducer Input Impedance

    System RMS Res. Input Data Rate Peak Res. RMS Res Peak Res. Noise in in Bits Range in SPS in Bits in µV in µV (ENOB) 20.1 17.1 0.101 0.742 19.6 16.4 0.146 1.113 19.2 16.4 0.185 1.351 ±200 mV 18.9 15.9 0.243...

  • Page 20: Table 1-5:Settling Error: (Typical, 25°C)

    Table 1-5: Settling Error: (Typical, 25°C) Input Range Condition Settling Error ±200 mV Scanning 200 mV step max 0.01% Time-base source: Internal 40 MHz  Trigger mode: post-trigger  Offset error:  Before calibration: ±0.5 mV typical  After calibration: ±0.001 mV typical (auto-zero disabled), < ...

  • Page 21: Table 1-6:Programmable Input Range And Gain

    Table 1-6: Programmable input range and gain Bipolar Input Range Gain ±10 V ±5 V ±2.5 V ±1.25 V Operational common-mode input range: ±13V  Overvoltage protection:  Power on: ±30 V (continuous)  Power off: ±15 V (continuous)  FIFO buffer size: 1024 samples (1024 x 32 bits) ...

  • Page 22: Table 1-8:-3Db Small Signal Bandwidth Vs. Sampling Rates

    Table 1-8: -3dB small signal bandwidth vs. sampling rates, in ±10V range Sampling Rate Bandwidth (-3 dB) In Samples-per-second (SPS) 1.1 Hz 2.2 Hz 4.4 Hz 6.6 Hz 11 Hz 13 Hz 22 Hz 26 Hz 44 Hz 220 Hz 1,000 440 Hz 2,000...

  • Page 23: Figure 1-2:Effective-Number-Of-Bits Vs. Gain

    System Noise (LSBrms, including Quantization, Typical, 25ºC) Figure 1-2: Effective-number-of-bits vs. Gain ENOB vs PGA Gain [Input = AGND] 1000 2000 3750 7500 15000 30000 Sampling Rate [Sam ples per Second] Gain = 1 Gain = 2 Gain = 4 Gain = 8 Figure 1-3: RMS Noise in µV vs.

  • Page 24: Figure 1-4:Spectral Response ±10 V Range

    Spectral Response (At 30,000-SPS, Typical, 25ºC) Spectral Response Figure 1-4: ±10 V range, 0.996094 kHz sine wave, -1 dB FS Input Signal = 996.094 Hz @ -1 dBFS, Sampling rate = 30 KHz SINAD = 99.5171 dB SNR = 101.0395 dB THD = -104.8086 ENOB = 16.2387 bit SFDR = 105.8299...

  • Page 25: Figure 1-6:Spectral Response ±2.5 V Range

    Spectral Response Figure 1-6: ±2.5 V range, 0.996094 kHz sine wave, -1 dB FS Input Signal = 996.094 Hz @ -1 dBFS, Sampling rate = 30 KHz SINAD = 97.5555 dB SNR = 98.0951 dB THD = -106.8792 ENOB = 15.9129 bit SFDR = 106.1694 -100 -120...

  • Page 26: Figure 1-8:Frequency Response Sampling At 30,000 Sps

    Frequency Response (vs. normalized sampling frequencies): Frequency Response Figure 1-8: Sampling at 30,000 SPS Frequency Response versus Norm. Sampling Frequency -100 -120 0.00 0.17 0.33 0.50 0.67 0.83 1.00 Normalized Sampling Frequency (Fs) Frequency Response Figure 1-9: Sampling at 15,000 SPS Fre quency Response versus Norm.

  • Page 27: Figure 1-10:Frequency Response Sampling Below 15,000 Sps

    Frequency Response Figure 1-10: Sampling below 15,000 SPS Frequency Response versus Norm. Sampling Frequency -100 -120 0.00 0.17 0.33 0.50 0.67 0.83 1.00 Normalized Sampling Frequency (Fs) Table 1-9: General Purpose Input Impedance Normal Power On Power Off Overload 1 G || 3 pF 1 K...

  • Page 28: Table 1-11:Settling Error: (Typical, 25ºc)

    Table 1-11: Settling Error: (Typical, 25ºC) Input Range Condition Settling Error ±10 V Scanning 20 Vpp <0.0005% ±5 V Scanning 10 Vpp <0.0005% ±2.5 V Scanning 5 Vpp <0.0005% ±1.25 V Scanning 2.5 Vpp <0.0005% Time-base source: Internal 40 MHz ...
  • Page 29 Analog Output (AO) Number of channels: 2 analog voltage outputs  D/A converter: DAC8812  Maximum update rate: 10 K sample/s  Resolution: 16-bit  Data transfers: Programmed I/O  Output range: ±10 V  Settling time (0.1% of full scale): 2 µs ...
  • Page 30 Isolated Pulse Command Outputs Number of channels: 3  Output type: AM26LS31 differential line-driver  Compliant to ANSI TIA/EIA-422-B and ITU Recommendation V.11  standards Logic Compatibility: 5V TTL with complementary output  Output voltage:  Logic low: VOL = 0.5 V max.; IOL = 20 mA max. ...
  • Page 31 Isolated Digital Inputs Number of channels: 8  Input type: Bipolar, resistive differential  Input impedance: 2.7 K || 250 pF   Input voltage:  Logic low: VIL = 0.7 V max.  Logic high: VIH = 4.8 V min. ...
  • Page 32 Isolated Power Supplies Number of channels: 2  Nominal output voltage  ISO5VDD: 5 V ±0.05V  ISOPWR: 5 V ±0.15V  Output current (Pulse Command channels are unused)  ISO5VDD: 160 mA max.  ISOPWR: 16 mA max.  Maximum output current (n channel of Pulse Command chan- ...

  • Page 33: Software Support

    DLLs, for most Windows-based systems, JYTEK also provides drivers for other application environment. Programming Library For customers who want to write their own programs, JYTEK provides the PCIS-DASK function library that is compatible with various operating systems. PCIS-DASK The PCIS-DASK includes device drivers and DLL for Windows 98/NT/ 2000/XP/Vista.
  • Page 34 This page intentionally left blank. Introduction...

  • Page 35: Getting Started

    Getting Started This chapter further describes the PCI-69524; a proper installation envi- ronment, its package contents and basic information users should be aware of. Installation Environment Whenever unpacking and preparing to install any equipment described in this manual, please refer to the Important Safety Instructions chapter of this manual.

  • Page 36: Package Contents

    DO NOT install or apply power to equipment that is damaged or if there is missing/incomplete equipment. Retain the ship- ping carton and packing materials for inspection. Please con- WARNING: tact your JYTEK dealer/vendor immediately for assistance. Obtain authorization from your dealer before returning any product to JYTEK. Getting Started...

  • Page 37: Pci-69524 Layout

    PCI-69524 Layout Figure 2-1: PCI-69524 PCB Layout and Mechanical Drawing Controller Getting Started...

  • Page 38: Installing The Card

    Installing the Card To install the card: 1. Turn off the system/chassis and disconnect the power plug from the power source. 2. Remove the system/chassis cover. 3. Select the PCI slot that you intend to use, then remove the bracket opposite the slot, if any. 4.

  • Page 39: Pci Configuration

    PCI Configuration 1. Plug and Play: As a plug and play component, the card requests an interrupt num- ber via its PCI controller. The system BIOS responds with an interrupt assignment based on the card information and on known system parameters.
  • Page 40 This page intentionally left blank. Getting Started...

  • Page 41: Signal Connections

    Signal Connections This chapter describes the connectors of PCI-69524, and the signal con- nections between PCI-69524 and external devices. Please see Figure 3-1, Figure 3-2 and Figure 3-3 for details. CN1/CN2 - 68-pin VHDCI Connector  SSI - SSI Connector ...

  • Page 42: Figure 3-1:Cn1 Connector & Pin Assignments

    Figure 3-1: CN1 Connector & Pin Assignments Pin # Pin # AI0+ AI0- VEX0+ VEX0- VEX_SEN0+ VEX_SEN0- AI1+ AI1- VEX1+ VEX1- VEX_SEN1+ VEX_SEN1- AI2+ AI2- VEX2+ VEX2- VEX_SEN2+ VEX_SEN2- AI3+ AI3- VEX3+ VEX3- VEX_SEN3+ VEX_SEN3- AGND AGND AIH4 AIL4 AIH5 AIL5 AIH6 AIL6...

  • Page 43: Figure 3-2:Cn2 Connector & Pin Assignments

    Figure 3-2: CN2 Connector & Pin Assignments Pin # Pin # PULSE0_A+ PULSE0_A- PULSE0_B+ PULSE0_B- ISO5VDD ISOGND PULSE1_A+ PULSE1_A- PULSE1_B+ PULSE1_B- ISO5VDD ISOGND PULSE2_A+ PULSE2_A- PULSE2_B+ PULSE2_B- ISO5VDD ISOGND ENC0_A+ ENC0_A- ENC0_B+ ENC0_B- ISOPWR ISOGND ENC1_A+ ENC1_A- ENC1_B+ ENC1_B- ISOPWR ISOGND ENC2_A+ ENC2_A-...

  • Page 44: Figure 3-3:Ssi Connector & Pin Assignments

    Figure 3-3: SSI Connector & Pin Assignments Signal Name SSI_AD_TRIG_IN 1, 3, 5, 7, 9, 13, 15 2, 4, 6,? 20 DGND Signal Connections...

  • Page 45: Table 3-1:I/O Signal Descriptions

    Table 3-1: I/O Signal Descriptions Signal Name Reference Direction Description Differential analog input channels. Channels load-cell AIn+ AIn- Input transducer inputs (1) (2) , and channels 4 to 7 are for general purpose analog inputs. Analog outputs for transducer voltage excitation, in selectable ranges of 2.5V or 10V.
  • Page 46 Isolated 5V output from internal regulator. ISO5VDD ISOGND Output Insignificant driving capacity, used for resistor pull-ups only. Isolated 5V output from internal regulator. Insignificant driving capacity, used for ISOPWR ISOGND Output resistor pull-ups only. May be modified to have 12 V output capability. Use in conjunction with IDOn and external EXT_ISOPWR ISOGND...

  • Page 47: Analog Input Signal Connections

    A ground-referenced signal is connected in some way to the buildings power system. That is, the signal source is already connected to a com- mon ground point with respect to PCI-69524, assuming that the com- puter is plugged into the same power system. Non-isolated outputs of instruments and devices that plug into the buildings power system are ground-referenced signal sources.

  • Page 48: Figure 3-4:Connecting To A Four-Terminal Load-Cell Transducer Using A Four-Wire

    Figure 3-4: Connecting to a four-terminal load-cell transducer using a four-wire con- nection +Vex VEXn+ VEX_SENn+ VEXn- -Vex VEX_SENn- AIn+ AIn- 69524 Load-cell Transducer PCI-9524 It is recommended to enable the remote-sense function, and loop-back the VEXn+/- to VEX_SENn+/- on the terminal board you're using when connecting to the transducer.

  • Page 49: Figure 3-5:Connecting To A Six-Terminal Load-Cell Transducer Using A Six-Wire Con

    Figure 3-5: Connecting to a six-terminal load-cell transducer using a six-wire connec- tion +Vex VEXn+ VEX_SENn+ +Sense VEXn- VEX_SENn- -Vex AIn+ AIn- -Sense Load-cell Transducer Whether to use a six-wire connection is dependent on the impedance of the load-cell transducers you are using, length of the wiring cable, wire- gauge inside the cable, and the required measurement accuracy.

  • Page 50: Figure 3-7:Ground-Referenced Source And Differential Input

    AIGND potential Figure 3-8 shows how to connect a floating signal source to PCI-69524 in differential input mode. For floating signal sources, you need to add a resistor at each channel to provide a bias return path. The resistor value should be about 100 times the equivalent source impedance.

  • Page 51: Figure 3-8:Floating Source And Differential Input

    Figure 3-8: Floating source and differential input Input Multipexer n = 4, ..., 7 Instrumentation Amplifier AIn+ Ground Referenced To A/D Signal Converter Source AIn- AIGND Signal Connections...

  • Page 52: Signal Sources And Terminal Devices

    Isolated Digital Signal Connection PCI-69524 provides three opto-isolated encoder input channels, three opto-isolated pulse-command outputs, eight channel opto-isolated digi- tal inputs as well as eight channel isolated digital outputs. Also, a built-in isolated power supply can be used as a resistors pull-up source.
  • Page 53 It's of differential input type, providing a normal input and a complementary input for each signal port. 1) The isolated ground (ISOGND) is shared between all isolated func- tions in PCI-69524. Make sure the ISOGND is connected to a known ground potential, only at one point in the system. NOTE:...

  • Page 54: Connecting To/From External Encoders

    Figure 3-9: Connecting to an external encoder with NPN sink drivers +ISOPWR ENCn_A+ Phase A 249O ENCn_A- ENCn_B+ Phase B 249O ENCn_B- ISOGND 69524 Encoder PCI-9524 Figure 3-10: Connecting to an external encoder with PNP source drivers +ISOPWR ENCn_A+ Phase A 249O ENCn_A- ENCn_B+...
  • Page 55 Figure 3-11: Connecting to an external encoder with push-pull source drivers +ISOPWR ENCn_A+ Phase A 249O ENCn_A- ENCn_B+ Phase B 249O ENCn_B- ISOGND 69524 Encoder PCI-9524 Figure 3-12: Connecting to an external encoder with differential line-drivers +ISOPWR ENCn_A+ Phase A 249O Phase A’...

  • Page 56: Figure 3-13:Connecting To An External Servo-Amplifier With Opto-Coupler Inputs

    3.3.3 Connecting to External Servo Amplifiers Figure 3-13: Connecting to an external servo-amplifier with opto-coupler inputs ISO5VDD CLK/CW PULSEn_A+ 470O PULSEn_A- COM0 DIR/CCW PULSEn_B+ 470O COM1 PULSEn_B- ISOGND ISOGND 69524 PCI-9524 Servo Amplifier Figure 3-14: Connecting to an external servo-amplifier with differential line-receivers ISO5VDD CLK+/CW+ PULSEn_A+...

  • Page 57: Figure 3-15:Connecting To An External Resistive Load From The Isolated Do Sink

    3.3.4 Interfacing Isolated DO with External Loads Connecting to external resistive loads Figure 3-15 presents connecting to external resistive loads. The left side illustrates driving an external LED using the internal ISOPWR source; the right side illustrates driving an external 5W, 24-VDC Bulb using an exter- nal power supply.

  • Page 58: Figure 3-16:Connecting To An External Inductive Load From An Isolated Do Sink

    Figure 3-16: Connecting to an external inductive load from an isolated DO sink driver Coil Coil Signal Connections...

  • Page 59: Interfacing Isolated Di With External Devices

    3.3.5 Interfacing Isolated DI with External Devices Connecting to a low-side push button Alternatively, the push button can be connected at the high-side, i.e. between the ISOVDD and IDn+ pins. Also, the IDIn+ and IDIn- can be interchanged, since the opto-coupler accepts bipolar input signals. Figure 3-17: Connecting to a low-side push button 5 VDC ISO5VDD...

  • Page 60: Figure 3-18:Connecting To An External Sink Driver

    Connecting to an external sink driver The sink driver can also be replaced by a mechanical switch, a proximity- sensor, etc. An external power-supply can be used instead of the internal isolated power source. Figure 3-18: Connecting to an external sink driver 5 VDC ISO5VDD IDIn+...

  • Page 61: Operation Theory

    Operation Theory The operation theory of the functions of PCI-69524 are described in this chapter. The functions include A/D conversion, D/A conversion, pulse- commands, encoder inputs, and isolated digital I/O. Operation theory helps users understand how to configure and program PCI-69524.

  • Page 62: Analog Input Channels

    4.2.1 Signal Acquisition and Processing Flow PCI-69524 was designed to detect weak signals through proper signal conditioning, amplification and digital post filtering, as depicted. Figure 4-2: Signal acquisition and data processing flow for transducer input channels...

  • Page 63: How To Define A 1 In 200,000 Count Resolution

    How to Define a 1 in 200,000 Count Resolution It is common in the weight-scaling or material-testing industries to spec- ify the resolution capability of a measurement device such as PCI-69524, in Counts or Digits, rather than in bits. For example, a measurement device that is capable of resolving 1 in 1000 counts, can successfully register a 1-gram change on a 1-kg capac- ity load-cell transducer.
  • Page 64 1 / 200,000, or 5-ppm of the full-scale output range of the transducer. The specified 200,000 count resolution capacity of PCI-69524 is verified by a precision load-cell simulator utilizing 3mV/V sensitivity, under 10-V excitation and using a six-wire remote-sense connection. The auto-zero...

  • Page 65: Data Rate Versus Sampling Rate

    The time delay there- fore required is called 'Settling Time'. Besides the propagation delay within PCI-69524, the parasitic in the cabling, the impedance of the transducers, and the amplitude difference between channels, affect final settling time figures.

  • Page 66: Table 4-1:Data Rates Vs. Multiplexing, Auto-Zero & Adc Sampling Rates, In Samples-Per-Second (Sps)

    'residual' signals in the previous measurement will be present in the cur- rent measurement. Users may increase the hardware settling time, to check if a lesser inter-channel crosstalk is perceived. See Table 4-1 for the equivalent Data Rates versus ADC actual Sampling Rates, under dif- ferent operating modes.

  • Page 67: Power Line Noise Rejection

    4.2.5 Power Line Noise Rejection The SINC filter built into the PCI-69524 works best for suppressing power line noise, if the ADC sampling rate is set to match power line fre- quency. The harmonics of the power line noise can also be suppressed as well, see Table 4-3 for illustration.

  • Page 68: Excitation And Remote-Sensing

    Please refer to section 3.2 for details. PCI-69524 applies simulated AC excitation to the load-cell transducers and must respond quickly toward the excitation voltage change, other- wise amplitude attenuation will occur. In general, calibrating your sys- tem and working at a fixed sampling rate not exceeding 100-SPS is preferred for most high accuracy applications.

  • Page 69: Table 4-2:Temperature Coefficient Of Different Metal Junctions

    Copper–Nickel Copper–Copper Oxide > 500 Wiring made to connect the load-cell and PCI-69524, inevitably creates multiple metal junctions. When there are temperature differences between these junctions, the thermal EMF will not be able to cancel out each other, and generates an offset error that fluctuates with ambient temperature change.

  • Page 70: Figure 4-4:The Effect Of Auto-Zero On Thermal Noise And 1/F Noise, Adc Running At 60 Sps

    50.00 60.00 Frequency (Hz) As many bipolar-input low-noise amplifiers, those used in PCI-69524 start to assert their 1/f noise below 10 Hz, the gradually increasing noise attenuation from below 20 Hz is a nice feature. This also implies that a...

  • Page 71: Warm-Up Requirement

    4.2.8 Warm-up Requirement PCI-69524 requires sufficient warm-up time before operation to achieve its specified accuracy. Typically a 25-minute warm-up time is required. Specifications are tested after 2-hour warm-up. 4.2.9 Post-processing IIR Digital Filter Digital filter banks are provided to improve visual stability of displayed numbers in digital weighting or metering systems, without the need for software-based averaging algorithms in user applications.

  • Page 72: Figure 4-5:Digital Filter Tap Length Effects

    Figure 4-5: Digital Filter Tap Length Effects on Signal Frequency Responses -100 -100 0. 00 0.25 0. 50 0.75 1.00 0. 00 0. 25 0. 50 0. 75 1. 00 -100 -100 0. 00 0.25 0. 50 0.75 1.00 0. 00 0.
  • Page 73 Second, system noise grows proportionally to ADC sampling rates. PCI-69524 is shipped with a set of predefined threshold values as listed in Table 4-3, one for each given sampling rate, as listed in Table 4-1. The listed figures are a good starting point to top up threshold counts if your transducer or environment is too noisy.

  • Page 74: Raw Data Format

    Table 4-3: Default Threshold Values (ADC counts) vs. ADC Sampling Rates ADC Sampling Rate Threshold Counts 30,000 15,000 7,500 3,750 2,000 1,000 4.2.10 RAW Data Format To maximize data processing flexibility, it is possible for users to deal with raw data directly, rather than scaled data. The data format of the acquired 32-bit raw AI is shown in Table 4-4.

  • Page 75: Ad Data Format

    ibrating mechanism may, however, invalidate the specified absolute accuracy. The 'Channel No.' ranges from 0 to 3, indicating which of the input chan- nels of that analog input group is converted during auto-scan mode. This represents channels 0 to 3 for transducer input channels, and channels 4 to 7 for general purpose input channels.

  • Page 76: Table 4-5:Bipolar Analog Input Ranges And

    Table 4-5: Bipolar analog input ranges and output digital codes for transducer input channels AD Code Count Description Analog Input Range (Hex) (Decimal) Full-scale Range ±200,000 µV Least significant 0.0238 µV bit (LSB) FSR-1LSB 199,999 µV 7FFFFF 8388607 Midscale +1LSB 0.0238 µV 000001 Midscale...

  • Page 77: Data Transfer Modes

    FIFO buffering latency. PCI-69524 continuously updates the latest acquired data onto a data port for that specific channel. In other words, there are eight separate data ports holding the latest converted data for analog input channels 0 to 7.

  • Page 78: Trigger Modes

    4 GB of address space. Figure 4-6: Linked List of PCI address DMA descriptors 4.2.13 Trigger Modes PCI-69524 supports a post-trigger mode, which initiates data acquisition timing right after a trigger event occurs. A trigger event occurs when the Operation Theory...

  • Page 79: D/A Conversion

    There are five trigger sources in PCI-69524, including software, SSI AD Trigger, Iso- lated Digital Input, Pulse Comparator, and Position Comparator. You must select one of them as the source of the trigger event.

  • Page 80: Isolated Encoder Input Channels

    EMI leakage, use twisted pair cabling for high-speed differential signal transmissions. PCI-69524 uses quadrature decoding logic, or X4 encoder mode, that increments/decrements the counter value on every edge of either Phase A or Phase B waveform. This provides four times the resolution of angu- lar/linear displacement, as shown in Figure 4-8.

  • Page 81: Isolated Pulse-Command Generator

    The decoder has a built-in position comparator that generates an AD trigger signal whenever the count value matches the user specified one. The PCI-69524 has an internal power supply for powering the external encoders and their output stages. The default output voltage is 5V.

  • Page 82: Isolated Digital I/O

    4.6.2 Isolated Digital Outputs PCI-69524 offers isolated digital outputs based on N-MOS sink drivers; they handle larger power and are sturdier than conventional Darlington output stages. However, when connecting to inductive loads, be sure to utilize the built-in fly-wheel diodes to prevent sink drivers from being destroyed by kick-back voltage.

  • Page 83: Trigger Sources

    External Digital Trigger An external digital trigger occurs when a rising edge or a falling edge is detected on the digital signal connected to PCI-69524's isolated digital input channel #0. This trigger source can work together with an external optical-approxi- mation-sensor and starts AI acquisition when the target test device is placed in an appropriate position.

  • Page 84: Pulse Comparator Trigger

    Figure 4-9: External digital trigger 4.7.3 Pulse Comparator Trigger The pulse-command generator has a built-in pulse comparator that gen- erates an AD trigger signal when the number of pulses generated has reached a user specified threshold. This trigger can be used whenever user applications require that AI acquisition begins after the external servo motor/stepper is actuated and positioned accordingly.

  • Page 85: Position Comparator Trigger

    4.7.4 Position Comparator Trigger The quadrate decoder has a built-in position comparator that generates an AD trigger signal whenever the counter value matches the user spec- ified one; that is, when the movement/displacement crosses a physical point set by user. This trigger can be useful if it is desired to start AI acquisition after the expected displacement is reached.
  • Page 86 Operation Theory...

  • Page 87: Calibration

    DA output errors. Loading Calibration Constants The PCI-69524 is factory calibrated before shipment by writing the asso- ciated calibration constants of TrimDACs firmware to the on-board EEPROM. TrimDACs firmware is the algorithm in the FPGA. Loading cali- bration constants is the process of loading the values of TrimDACs firm- ware stored in the on-board EEPROM.

  • Page 88: Auto-Calibration

    Auto-calibration By using the auto-calibration feature of PCI-69524, the calibration soft- ware can measure and minimize measurement errors without external signal connections, reference voltages, or measurement devices. PCI-69524 has an on-board calibration reference to ensure the accuracy of auto-calibration. The reference voltage is measured on the produc- tion line through a digital potentiometer and compensated in the soft- ware.

  • Page 89: Important Safety Instructions

    Important Safety Instructions For user safety, please read and follow all instructions, WARNINGS, CAUTIONS, and NOTES marked in this manual and on the associated equipment before handling/operating the equipment. Read these safety instructions carefully.  Keep this user’s manual for future reference. ...
  • Page 90 Never attempt to fix the equipment. Equipment should only be  serviced by qualified personnel. A Lithium-type battery may be provided for uninterrupted,  backup or emergency power. RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THEIR INSTRUC- TIONS.
  • Page 91 Warranty Policy Thank you for choosing JYTEK. To understand your rights and enjoy all the after-sales services we offer, please read the following carefully. 1. All JYTEK products come with a limited two-year warranty: The warranty period starts on the day the product is shipped ...
  • Page 92 2. Repair service is not covered by JYTEK's two-year guarantee in the following situations: Damage caused by not following instructions in the User's Man-  ual. Damage caused by carelessness on the user's part during product  transportation. Damage caused by fire, earthquakes, floods, lightening, pollution, ...
  • Page 93 Getting Service Customer satisfaction is our top priority. Contact us should you require any service or assistance. SHANGHAI JYTEK CO.,LTD. Web Site http://www.jytek.com Sales & Service service@jytek.com Telephone No. +86-21-50475899 Fax No. +86-21-50475899 Mailing Address 300 Fang chun Rd., Zhangjiang Hi-Tech Park,...
  • Page 94 Getting Service...

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