BK Precision Sefram DAS1800 User Manual
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BK Precision Sefram DAS1800 User Manual

BK Precision Sefram DAS1800 User Manual

High speed modular data acquisition recorder
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DAS1800
High Speed Modular Data
Acquisition Recorder
Version V3.0
bkprecision.com - sefram.com

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Summary of Contents for BK Precision Sefram DAS1800

  • Page 1 User manual DAS1800 High Speed Modular Data Acquisition Recorder Version V3.0 bkprecision.com - sefram.com...

  • Page 2: Safety And Symbols

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Chapter 1 Safety and symbols To ensure proper use of the unit, please observe the safety and operating requirements described in this manual. Specific warning signals appear throughout this manual to draw your attention to important points. Please read the following instructions in this chapter carefully before using your Data Acquisition System.

  • Page 3: Category Rating

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Before powering up the device : • Read and understand the safety and operating information in this manual. • Follow all listed safety precautions. • Operating the instrument with the wrong supply voltage voids the warranty •...

  • Page 4: Ground The Instrument

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Ground the instrument To minimize the risk of electric shock, the chassis of the instrument must be connected to a safety ground. The instrument is earthed via the earth conductor of the supplied power cable, which must be plugged into an approved three-conductor electrical socket.

  • Page 5: Operating Environment

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Return the instrument to Sefram or B&K Precision for service and repair to ensure that safety and performance characteristics are maintained. Operating environment The instrument is designed for use in pollution degree 2 indoor environments. The operating temperature range is 0 to 40 degrees Celsius and a relative humidity of 20% to 80%, non-condensing at an altitude <...

  • Page 6: Particular Precautions

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Particular precautions To avoid electric shock, observe the following precautions when working with dangerous voltages: • Do not use this product for purposes other than those for which it is intended. • Before using the recording device, make sure that the instrument and the equipment required for its use (measuring lead, external box, accessories...) are in working order.

  • Page 7: Concerning The Exported Devices In North America

    Sefram CHAPTER 1. SAFETY AND SYMBOLS Concerning the exported devices in North America This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

  • Page 8: Table Of Contents

    Sefram CONTENTS Contents 1 Safety and symbols 1.1 Category rating ..........1.2 Power supply .
  • Page 9 Sefram CONTENTS 3.8 Alarm outputs ..........41 3.9 Recording measurements .
  • Page 10 Sefram CONTENTS 7 MDF4 file format 7.1 Format ........... . . 101 7.2 Version and compliance with ASAM standard .

  • Page 11: List Of Figures

    Sefram LIST OF FIGURES List of Figures 2.1 General views ..........15 2.2 Supplied accessories .
  • Page 12 Sefram LIST OF FIGURES 4.8 Graphic display parameters ......... 59 4.9 Measurement function .
  • Page 13 Sefram LIST OF FIGURES 8.9 Enp2s0 Interface ..........110 8.10 Fixed IP address setting .

  • Page 14: List Of Tables

    Sefram LIST OF TABLES List of Tables 1.1 Symbols on the device ..........1.2 Symbols in the manual .

  • Page 15: Introducing The Device

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE Chapitre 2 Introducing the device Introduction SEFRAM thanks you for your confidence in us and is pleased to present the DAS1800. This new-generation multi- channel Data Acquisition System is developed and manufactured in France. Its ability to record and analyze all types of electrical signals (sensors, electrical relays, electrical networks, etc.) makes it ideal for a wide range of industrial applications (maintenance, R&D, production, etc.).

  • Page 16: Supplied Accessories

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE 2.2.1 Supplied accessories The device is provided with : Main power cord (IEC) Carrying case Sub-D15 HD connector (x1) Sub-D25 connector (x1) 8-pin connector for external power supply output 4-pin connector (x8) (with multiplexed board) Pair of male banana plug connectors (x4) (for universal and high-impedance acquisition boards) 2.2 : Supplied accessories...

  • Page 17: Acquisition Modules

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE 2.2.2 Acquisition modules When you order the device, you can choose from four different types of modules : universal, multiplexed, high- voltage or high-impedance. Each has its own technical characteristics (see technical specifications section for details).

  • Page 18: Interfaces

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE 2.2.3 Interfaces The various device interfaces are shown in the following diagrams : 2.4 : View from above IGURE Symbol Description On/off push-button Ethernet port for connecting the device to a computer network (x2) (see remote control section) HDMI port for transferring the screen display to an external display (connect the HDMI cable before starting up the device)

  • Page 19: Optional Accessories

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE Symbol Description Sub-D25 connector for logical channel inputs and outputs (see logical channels section) Sub-D15 connector for external synchronization (See external synchronization section) Power supply and fuse support (2 x T4AL 250 V) Chassis ground connector External power supply Protective earth terminal (battery operation) 2.2.4 Optional accessories...

  • Page 20: Factory Option

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE 2.2.5 Factory option • GPS/IRIG input : allows the instrument to be time-synchronized with a GPS/IRIG signal (available soon) • Battery option : allows the instrument to work without power cord to a electrical grid A battery charge status LED is present on the device.

  • Page 21: Interface And Ergonomic

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE Interface and ergonomic 2.3.1 Touch control The product is designed for smartphone-type touch screen use. The following movements are implemented: • Single tap: performs an action • Drag & drop: moves graphic objects • 2-finger zoom •...

  • Page 22: Built-In Help

    Sefram CHAPITRE 2. INTRODUCING THE DEVICE Built-in help 2.5.1 Tool type When you long-click on a button, a tooltip displays help on the corresponding action. 2.5.2 Help window Clicking on the question mark icon opens a help window. 2.5.3 On-board user manual The user manual is embedded in the product and available from any page by clicking on the manual button in the main menu bar at the top of the page.

  • Page 23: Getting Started

    Sefram CHAPITRE 3. GETTING STARTED Chapitre 3 Getting started Installing and removing acquisition modules Module installation and removal must be carried out with the power off. When doing so, switch off the device and ensure that no cables are connected to the module inputs. Add an acquisition module : The module plugs into the device as a simple way.

  • Page 24: File Creation

    Sefram CHAPITRE 3. GETTING STARTED File creation Before starting a measurement campaign, we recommend that you organize your files in advance. To do this, go to "File Manager" in the navigation bar. Figure 3.2: File Manager "sda1" (solid drive a1) (1) corresponds to the contents of the device’s disk memory. It is also available by pressing "DISK"...

  • Page 25: Channels And Measurements

    Sefram CHAPITRE 3. GETTING STARTED Figure 3.3: File creation By default, screenshots (1) and measurement recordings (2) are at the root of the disk. Click on create a new folder, name and select it then click on "choose as working directory". Figure 3.4: File creation as working directory Channels and measurements A channel corresponds to a physical input to the device.

  • Page 26: Analog Channel Settings

    Sefram CHAPITRE 3. GETTING STARTED Analog channel settings To access acquisition board analog channel settings, use the main navigation bar by clicking on "configuration" then "channels". 3.5 : Analog channel settings IGURE On this page you can view the table containing all the parameters of the analog channels. It is possible to filter the display of channels by acquisition card present on the device (1), and to customize the display of information given in columns (2).

  • Page 27: Bargraph Measurements

    Sefram CHAPITRE 3. GETTING STARTED 3.6 : Bargraph measurements IGURE Pressing the “Display option” button opens the bargraph display and filter configuration page. Here you’ll find several options : • Activate DMM display directly in the bargraph (a). • Modify value update period (b). •...

  • Page 28: Channel Configuration

    Sefram CHAPITRE 3. GETTING STARTED 3.4.1 Channel configuration By pressing in the “Configure” column, you open the complete page of channel parameters shown above. 3.7 : Page configuration IGURE 1. Channel name displayed on graphics, can be modified but limited to 11 characters. 2.

  • Page 29: Calcul Measurements

    Sefram CHAPITRE 3. GETTING STARTED By pressing the icon shown below, you can duplicate all the parameters of the selected channel to other channels on the device. 3.8 : Copying parameters from an analog channel IGURE 3.4.2 Calcul measurements Signal edge detection The frequency, PWM, RMS and counter measurands are calculated by detecting rising and falling signal edges.

  • Page 30: Meter

    Sefram CHAPITRE 3. GETTING STARTED The difference between high and low threshold corresponds to +/- 0.25% of the rating used (e.g. 100V rating and threshold set to 0V, Vmin = -250 mV and Vmax = 250 mV). The threshold value can be set directly by the user via the HMI. Simply uncheck the “Auto threshold” option and specify the threshold value in volts.

  • Page 31: Frequency/Pwm

    Sefram CHAPITRE 3. GETTING STARTED Measurement Frequency/PWM La fréquence et le rapport cyclique du signal sont calculés par détection des front montants et descendants du signal par rapport à un seuil. La période du signal correspond au temps séparant deux fronts montants du signal. Le temps à...

  • Page 32: Integration Time By Frequency

    Sefram CHAPITRE 3. GETTING STARTED For signals with frequencies less than or equal to 100Hz, we measure the time corresponding to one period. For signals with frequencies greater than 100Hz, several periods are measured in order to obtain an average period and thus limit the error : Frequency (Hz) Periode (s)

  • Page 33: Derivative Calculation With Sine Signal

    Sefram CHAPITRE 3. GETTING STARTED Measurement Derivative A numerical approximation of the derivative is obtained by calculating the slope between two points with coordi- nates (x ) et (x ). The derivative is associated with the abscissa x (i+1) (i+1) The time between two points used to calculate the derivative is given by the parameter ∆...

  • Page 34: Derivative Calculation With Sine Signal And Low-Pass Filter Butterwork

    Sefram CHAPITRE 3. GETTING STARTED 3.14 : Derivative calculation with sine signal and low-pass filter Butterwork IGURE The choice of F depends on the effectiveness of noise rejection. If the signal to be processed is fairly "noisy", large values of To (i.e.T ~ 30∆...
  • Page 35 Sefram CHAPITRE 3. GETTING STARTED Measurement Integral The signal is sampled at a frequency of 1 MHz, giving one sample every microsecond. The signal integral is obtai- ned by accumulating the sample values (V.µS). The integral value is obtained in V.s by dividing the accumulated value by the sampling frequency.

  • Page 36: Digital Channels Setting

    Sefram CHAPITRE 3. GETTING STARTED Digital channels setting Digital channels are accessible via the device’s 25-pin D-Sub connector. To access digital channel settings, press Configuration > Channels > Digital. The optional digital channel cable accessory allows all digital channels to be wired using standard banana plugs, giving you greater convenience when wiring your equipment.

  • Page 37: Logic Inputs (Vlog)

    Sefram CHAPITRE 3. GETTING STARTED 3.5.1 16 logic inputs (Vlog) To open all the parameters of a digital input, press the symbol from the measure colomn : The logic inputs can monitor all signals up to 24V. To increase the maximum permissible voltage, the Logic channel box option 917008000 is available.

  • Page 38: Setting Script Channels

    Sefram CHAPITRE 3. GETTING STARTED Setting script channels To access logic channel settings, press Configuration > Channels > Script. 3.18 : Table of script channels IGURE On this page, you’ll find a table showing all script channels. Each channel is shown in a row (1), and the DAS1800 offers the option of setting up to 24 script channels.

  • Page 39: Simple Operation

    Sefram CHAPITRE 3. GETTING STARTED 3.6.1 Simple operation 3.20 : Simple operation IGURE This function calculates using simple operations (2) (addition, subtraction, division and multiplication) 2 analog and/or logic channels (1,3) 3.6.2 Custom function, script 3.21 : Script function IGURE By ticking the “Script”...

  • Page 40: Operation

    Sefram CHAPITRE 3. GETTING STARTED The language The language used for scripting paths uses the C++ Mathematical Expression Library (ExprTk) . Operator and keyword support : Basic operation +, -, *, /, %, ^ Assignment :=, +=, -=, *=, /=, %= Equality and inequality =, ==, <>, !=, <, <=, >, >= Logical operation...

  • Page 41: Power Supply Outputs

    Sefram CHAPITRE 3. GETTING STARTED The use of script paths considerably increases the time taken to open files on the DAS. We re- commend that you use DASPRO to process these files, to take full advantage of your computer’s computing power. Power Supply Outputs The external power supply located on the 25-pin D-Sub connector provides a nominal voltage of 12V +/- 5% with a maximum delivered current of 200 mA (limited by resettable fuse).

  • Page 42: Recording Measurements

    Sefram CHAPITRE 3. GETTING STARTED Recording measurements 3.9.1 Recording file configuration Recording file configuration is available from the menu Configuration > Records > File info File name The file name is a string of characters. All alphanumeric characters are allowed, with the exception of the following characters: "...

  • Page 43: Sampling Frequency

    Sefram CHAPITRE 3. GETTING STARTED Regardless the setting of this limit, a warning message is displayed when the available disk space is less than 100GB. The recording is automaticaly stopped when the free disk space is less than 5GB. User information The user can add a certain amount of information to be included in the registration file: •...
  • Page 44 Sefram CHAPITRE 3. GETTING STARTED The same measurement can be recorded at a single frequency. Two measurements of the same channel can have different sampling frequencies. Recording periods are rounded to the nearest µs. In the example shown in the table above, the direct voltage measurement of channel 1 is recorded at 1MHz, while the RMS measurement of channel 1 is recorded at 5kHz.

  • Page 45: Start And Stop Settings

    Sefram CHAPITRE 3. GETTING STARTED 3.10 Start and stop settings To set your acquisition trigger conditions, go to Configuration > Records > Trigger. 3.23 : Start and stop settings IGURE Each record must be set up with a start condition and a stop condition (1). For each, there are 3 different types of triggers : manual, date and trigger (2).

  • Page 46: Signal Trigger

    Sefram CHAPITRE 3. GETTING STARTED 3.10.3 Signal trigger Level : The user can program recording start and stop conditions according to the values measured on the analog and digital channels : 3.25 : Trigger on level IGURE First define the physical channel and its associated measurement to which you want to apply the trigger condi- tion (1).

  • Page 47: Edge Trigger

    Sefram CHAPITRE 3. GETTING STARTED 3.26 : Edge trigger IGURE Combination of trigger conditions It is possible to combine several conditions on several channels which, once verified, will start/stop recording. When several conditions are set, the user selects the "AND" or "OR" connector : •...

  • Page 48: Pre-Trigger

    Sefram CHAPITRE 3. GETTING STARTED 3.10.4 Pre-trigger When the start condition is a trigger or a combination of triggers, the user can configure a pre-trigger. This corres- ponds to a number of samples or a time to be recorded before the trigger condition. The user can configure the duration of this window (1).

  • Page 49: Post-Trigger

    Sefram CHAPITRE 3. GETTING STARTED 3.10.5 Post-trigger The user can set a time during which the device continues to record after the stop condition has been triggered. 3.30 : Post-trigger IGURE 3.10.6 Rearm The user can choose the rearm mode : •...

  • Page 50: Setting Save

    Sefram CHAPITRE 3. GETTING STARTED 3.10.7 Setting save You can save a acquisition configuration file (1) with all the parameters defined for an acquisition, it can be recalled later by importing it (3): Fichier .acq_cfg : paramètres (1) • Measurement parameters (measured phenomenon, range, sensor, channel color, etc. ) •...

  • Page 51: External Sync

    Sefram CHAPITRE 3. GETTING STARTED 3.11 External sync The external synchronisation channels are located on the sub-D15 connector on the device. To access the logic channel settings, press Configuration > Sync > External sync. These are trigger signals for other devices linked to the recording in progress.

  • Page 52: Chronogram Start / Stop

    Sefram CHAPITRE 3. GETTING STARTED Start / Stop The Start/Stop (pin 11 Ext sync start/stop on the connector) is a signal indicating the start of recording (manually by pressing the Start button or automatically via the reset or remote control). When the device is on stand-by or after recording has been stopped (by pressing the Stop button), the output signal is 0 V.

  • Page 53: Measurement Data Display

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Chapter 4 Measurement data display Real-time display To view your measurements in real time, click on the "real time" tab in the main navigation bar: Figure 4.1: Real-time data display To view previously configured measurands, “drag and drop” them from the measurand bar graph into the graph- ics area.

  • Page 54: F(T) : Oscilloscope

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.1.1 F(t) : Oscilloscope See “visualization and graphic analysis” chapter for details on the functionnality of the graph widget. Real time display mode Figure 4.2: F(t) in oscilloscope mode The real-time F(t) display has several display behaviors: •...

  • Page 55: Dmm Display

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.1.2 DMM display DMM mode displays real-time measurements in digital format. In order to be human readable, the value displayed is an average. You can use the HDMI output of the device to transfer the image to an external screen. Figure 4.3: DMM display To display measurements in numerical format, simply press and drag the measurement over the graphic area.
  • Page 56 Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY The averaging period (1) of the DMM can be 200ms or 2s. The number of samples for averaging depends on the speed of the acquisition card used. For example, with a universal card, it will be 1 Mech/s. Parameters (2) allow you to adjust display modes and formats.

  • Page 57: Custom Display

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.1.3 Custom display Dashboards are fully customizable and saved when the configuration is exported. Up to 16 widgets can be dis- played simultaneously. These widgets can be of different types, with pre-configurations accessible via button (1) •...

  • Page 58: Visualization And Graphical Analysis

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Visualization and graphical analysis The user interface for viewing F(t), or analyzing a recording on the device or on a PC (via DASpro software) is similar. You can download the DASpro software from your DAS1800’s web server by clicking the “DOWN- LOAD DASPRO”...

  • Page 59: Zooming In And Out On X And Y Axes

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.7 : Zooming in and out on X and Y axes IGURE By moving the thumb and forefinger closer or further apart on the Y ordinate axis (amplitude), it’s possible to zoom in and out between the defined limits (1). The same applies to the X-axis, to change the time base (2). On a computer or if a mouse is connected to the device, use the mouse wheel to perform this function, positioning the cursor on the desired axis.

  • Page 60: Mathematical Calculations

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Symbol Description Selects the measurements to be displayed in the graphics area Allows you to set display parameters : division of the graphics area into several screens, choice of colors, background image, etc. Shows/hides vertical and horizontal cursors Displays/hides full name of displayed measurement(s) with access to display parameters Displays/hides predefined mathematical calculations in real time...

  • Page 61: Calculation Settings

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Click on the "Measurements" window to open the calculation settings manager. 4.10 : Calculation settings IGURE 1. Window display management 2. Channel and calculation type selection 3. Add" button to display the calculation selected in (2) 4.

  • Page 62: Type Of Calculation

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.3.2 Type of calculation 20 different mathematical calculations are offered, divided into 3 categories : • Amplitude : minimum, maximum, peak-to-peak, low, high, amplitude, over oscillations • Time : frequency, period, rise and fall times, positive and negative widths, positive and negative duty cycles •...
  • Page 63 Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Negative M in overshoot Amplitude Frequency Average frequency P eriod Average duration of a complete cycle calculated N Duration f ull period Period over as many periods as possible T1 = 10% Amplitude T2 = 90% Amplitude Rise time Rise time = T2 T1 T1 = 90% Amplitude...

  • Page 64: Analyzing A Record

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Calculation over the entire RM S = graphical window RMS cycle RM S = i=N 1 Analyzing a Record To open a saved measurement file, go to “Drive” from the main navigation bar. 4.11 : Saved file list IGURE By pressing “Data”...

  • Page 65: Exporting A Record File

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Exporting a record file In the “DATA” menu, click on the “Export data” button (1) 4.12 : Select file for export IGURE Measurand selection : Measurands in the file are grouped by recording frequency (1). Select the measurands to be exported from the drop-down list (2) by ticking the associated box (3).

  • Page 66: Select Export Period

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY Recording period : This interface allows you to shorten a recording by modifying the start and/or end date. The time bar displayed in blue represents the selected portion of time. By default, the entire duration of the recording is selected. To modify the recording start date, move the left cursor (2).

  • Page 67: Resampling

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.15 : Resampling IGURE Conversion : Select output file format : 4.16 : Selection of format IGURE • CSV format : maximum file size limited to 5M samples. Absolute dates (1) : display time absolutely or relative to start of recording. Add units (2) : add a line under the measurand name containing the units.

  • Page 68: File Transfer

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY File transfer 4.6.1 File retrieval via USB key Plug a USB key into one of the device’s ports. To retrieve a file from the device’s hard disk and transfer it to your computer, go to "File Manager" from the main navigation bar. Press "DISK" to access the entire contents of the device’s internal memory.

  • Page 69: File Transfer Via Ftp Protocol

    Sefram CHAPTER 4. MEASUREMENT DATA DISPLAY 4.6.2 File transfer via FTP protocol The FTP protocol enables files to be retrieved or deposited between a remote station and the device. Connect the device to a computer network via the Ethernet port or Wi-Fi option. For more informa- tion, see remote control section.

  • Page 70: Advanced Features

    Sefram CHAPITRE 5. ADVANCED FEATURES Chapitre 5 Advanced features Units library The units of measurement are managed from a database accessible from Configuration > Channels > Units library. 5.1 : Unit libraries IGURE By default, most of the most commonly used units of measurement are already built into the device. To add a unit, press "Create a unit"...

  • Page 71: Creation Of A "Pound" Unit

    Sefram CHAPITRE 5. ADVANCED FEATURES 5.2 : Creation of a "pound" unit IGURE Define the name of the unit (1) and the associated symbol (2). Choose the corresponding physical quantity from the drop-down list (3). In our case, the pound is a mass. Finally, define the conversion function (4). The conversion function is a calculation applied to the reference unit of the international system, which in the case of mass is the kg.

  • Page 72: Sensors Library

    Sefram CHAPITRE 5. ADVANCED FEATURES Sensors library Each measurement is associated with a sensor. To access the sensor library, go to Configuration > Channel > Sensors library A table listing all sensors and their parameters is shown on this page. 5.3 : Sensors library table IGURE You can search for sensors already in the library by name (1) or filter the information given by column for each...

  • Page 73: Example : How To Add A 4-20 Ma Pressure Sensor With 50 Ohm Shunt

    Sefram CHAPITRE 5. ADVANCED FEATURES 4. Sensor response time (seconds). Used to compensate for the sensor response time in order to synchronize all device channels. 5. Select conversion function for unit change. 5.2.2 Example : how to add a 4-20 mA pressure sensor with 50 ohm shunt To carry out a current measurement (excluding clamp), it is essential to have a shunt plugged in the channel input.
  • Page 74 Sefram CHAPITRE 5. ADVANCED FEATURES The shunt value used is selected in the channel configuration page. User manual...

  • Page 75: The Different Types Of Digital Filter

    Sefram CHAPITRE 5. ADVANCED FEATURES The different types of digital filter The user can choose between 4 different types of digital filters: 5.3.1 Low-pass filter The low-pass filter is a device that exhibits a relatively constant frequency response (fixed gain) at low frequencies and a decreasing gain at frequencies above the cut-off frequency.

  • Page 76: Bandpass

    Sefram CHAPITRE 5. ADVANCED FEATURES 5.3.3 Bandpass The bandpass filter is a device that demonstrates a relatively constant gain in the passband (band of frequencies between a low cutoff frequency and a high cutoff frequency), increasing gain at frequencies below the low cutoff frequency (40 dB / decade) and decreasing gain at frequencies above the high cutoff frequency (40 dB / decade).

  • Page 77: Butterwork Low-Pass Filter: Bode Diagram

    Sefram CHAPITRE 5. ADVANCED FEATURES Butterworth The Butterworth characteristic is probably the most commonly used for signal filtering. This characteristic is said to be "the flattest in frequency". The parameters of this type of filter are arranged so as to achieve the most constant gain possible in the passband and -3 dB attenuation at the cutoff frequency, whatever the filter order.

  • Page 78: Butterwork Low-Pass Filter: Impulse Response

    Sefram CHAPITRE 5. ADVANCED FEATURES Figure 5.9: Butterwork low-pass filter: Impulse response Chebyshev In contrast to the Butterworth characteristic, the Chebyshev characteristic presents a ripple in the passband. How- ever, it offers better attenuation around the cut-off frequency. The passband ripple is fixed at 0.1 dB. This filter is widely used when ripple is not a problem.

  • Page 79: Chebyshev Low-Pass Filter: Index Response

    Sefram CHAPITRE 5. ADVANCED FEATURES Figure 5.11: Chebyshev low-pass filter: Index response Figure 5.12: Chebyshev low-pass filter: Impulse response User manual...

  • Page 80: Bessel Low-Pass Filter: Bode Diagram

    Sefram CHAPITRE 5. ADVANCED FEATURES Bessel The Bessel filter, also known as the Thompson filter, is a filter whose main characteristic is to offer a constant bandwidth delay. In concrete terms, this means that all pure, in-band frequencies pass through it in exactly the same time.

  • Page 81: Bessel Low-Pass Filter: Impulse Response

    Sefram CHAPITRE 5. ADVANCED FEATURES Figure 5.15: Bessel low-pass filter: Impulse response Comparison of the 3 filter types Butterworth / Chebyshev / Bessel Figure 5.16: Filter comparison: Bode diagram User manual...

  • Page 82: Filter Comparison: Index Response

    Sefram CHAPITRE 5. ADVANCED FEATURES Figure 5.17: Filter comparison: Index response Figure 5.18: Filter comparison: Impulse response User manual...
  • Page 83 Sefram CHAPITRE 5. ADVANCED FEATURES Cheybyshev inversé The Chebyshev type 2 filter, also known as inverse Chebyshev, has monotonic passband attenuation, like the Butterworth filter, and ripples in the stopband. This filter has a better group delay, which means less distortion of complex signals.

  • Page 84: Cold Welding Compensation

    Sefram CHAPITRE 5. ADVANCED FEATURES Papoulis The Papoulis filter provides a compromise between the Butterworth filter, which is monotonic but has slower atten- uation, and the Chebyshev filter, which has faster attenuation but has ripple in the passband or stopband. Cold welding compensation When two wires composed of different metals are connected at their ends and one of them is heated, direct current flows through the circuit.
  • Page 85 Sefram CHAPITRE 5. ADVANCED FEATURES The resulting voltage measured by the voltmeter is equal to V1-V2, that is, it is proportional to the temperature difference between J1 and J2. J2 junction is called reference junction or cold weld. By measuring the temperature of the reference junction using a temperature sensor, it is possible to deduce the temperature of the hot weld.
  • Page 86 Sefram CHAPITRE 5. ADVANCED FEATURES No correction No cold welding correction is applied. The temperature returned to the user is the temperature of the thermocouple table associated with the measured voltage. This option can be used if the user wants to measure the temperature difference obtained by two different thermocouples via the use of scripts (calculations between channels).

  • Page 87: Adjusting The Zero

    Sefram CHAPITRE 5. ADVANCED FEATURES Adjusting the Zero The adjustment of the zero of the universal boards and the cold welding of the thermocouples are managed from a database accessible from Configuration > Channels > Adjustment Figure 5.19: Zero adjustment 1.

  • Page 88: Remote Control

    Sefram CHAPITRE 5. ADVANCED FEATURES Remote control To use the remote control functions, the device must be connected to a network. Please refer to the "Network settings" chapter for further information on configuration. 5.6.1 Web server The system incorporates a web server function, enabling a connection to be established via the Internet from a web browser.

  • Page 89: Vnc Configuration

    Sefram CHAPITRE 5. ADVANCED FEATURES 5.21 : VNC Configuration IGURE Download the VNC viewer® application, launch the utility and go to File > New connection (1). Enter the device IP address in the VNC server field (2). 5.22 : New VNC viewer® connection IGURE The new connection appears in the list, click to connect : You can secure your connection with a password.

  • Page 90: Connection

    Sefram CHAPITRE 5. ADVANCED FEATURES 5.23 : Connection IGURE You can then operate the device with full access to all functions : 5.24 : VNC viewer® control IGURE User manual...

  • Page 91: Scpi Protocol

    Sefram CHAPITRE 5. ADVANCED FEATURES SCPI protocol SCPI (Standard Commands for Programmable Instruments) is a universal programming language for electronic test and measurement instruments, based on the IEEE 488.1 and IEEE 488.2 standards. Commands are ASCII textual strings which are sent to the instrument over the physical layer. Commands are a series of one or more keywords, many of which take parameters.

  • Page 92: Processing & Analysis

    Sefram CHAPTER 6. PROCESSING & ANALYSIS Chapter 6 Processing & Analysis Power analysis 6.1.1 General information The power analysis function enables a set of measurements to be taken on a power supply network. The measured quantities can be displayed in real time or saved in a measurement file. Using the power analysis function does not interfere with the operation of the device, and enables other types of data to be recorded.

  • Page 93: Calculation Interval

    Sefram CHAPTER 6. PROCESSING & ANALYSIS 6.1 : Calculation interval IGURE • 10/12 periods : The first calculation interval is 10/12 periods, 10 signal periods for 50Hz, 12 signal periods for 60Hz and 80 signal periods for 400Hz (approx. 200ms). This interval uses the raw data to perform the calculations.
  • Page 94 Sefram CHAPTER 6. PROCESSING & ANALYSIS • Peak : Corresponds to the voltage difference between the low and high values : P eak = High P EAK • Crest factor : CrestF actor = RM S • Phase : Corresponds to the phase shift between the voltage channel and the reference channel U1. •...

  • Page 95: Presentation & Programming

    Sefram CHAPTER 6. PROCESSING & ANALYSIS 6.1.2 Presentation & Programming Settings To access the “ Power analysis ” menus, press Configuration > Analysis > Power analysis. Figure 6.2: Power Analysis Networks On this page, you’ll find a list of all the networks set up (1) in the DAS1800. To add a new network, press the “Add network”...

  • Page 96: Measurand Selection

    Sefram CHAPTER 6. PROCESSING & ANALYSIS Figure 6.4: Measurand selection Once your network is configured, you can create a dedicated real-time network view page by clicking on the button (8) at the bottom of the parameters. Analysis In the real time tab, you can view all energy analysis measurands in real time. You can use all the device’s standard displays as well as two dedicated energy analysis displays.

  • Page 97: Widget Histogram

    Sefram CHAPTER 6. PROCESSING & ANALYSIS The standard network analysis screen is made up of several widgets, including 2 specific ones: • Histogram (1) designed for harmonic analysis and measurement • Fresnel diagram (2) illustrating vectors displaying the phase relationship between voltages and currents. Vector representation enables validation of the device’s wiring to the network.

  • Page 98: Option Widget

    Sefram CHAPTER 6. PROCESSING & ANALYSIS Figure 6.7: Option Widget These options allow you to customize the graph (1), select the number of harmonics displayed (2), adjust the update speed using the slow mode (3),display harmonic values as a percentage (4), display odd harmonics only (5) or choose the network to be analyzed (6).

  • Page 99: Data Recording

    Sefram CHAPTER 6. PROCESSING & ANALYSIS on the symbol gives access to the diagram options. Figure 6.9: Option Widget These options allow you to customize the graph (1), adjust the refresh rate using the slow mode (2), change the diagram orientation (3) and change the reference channel (4), or choose the network to be analyzed (5). The use of configurable “Custom X ”...
  • Page 100 Sefram CHAPTER 6. PROCESSING & ANALYSIS The measurands displayed in the table correspond to those ticked when the network was created. To add others, simply activate them in the analysis network configuration. By default, newly activated measurands are recorded at 10 periods. The output file is consistent with the rest of the device, and will contain the measurands related to energy analysis, as well as the analog channels.

  • Page 101: Mdf4 File Format

    Sefram CHAPTER 7. MDF4 FILE FORMAT Chapter 7 MDF4 file format Measurement Data Format version 4 (MDF4) is an ASAM file standard for storing measurement data in a binary file format. For more information about the MDF4 file format, please visit https://www.asam.net/standards/detail/mdf/wiki/. Format The MDF contains both raw measurement data and the metadata needed to interpret the raw data.

  • Page 102: Example

    Sefram CHAPTER 7. MDF4 FILE FORMAT Example Here’s an example of a Python implementation using the Asammdf library to open an MDF4 record Listing 7.1: Example of using the MDF4 library in Python from asammdf i m p o r t mdf = MDF( ’...

  • Page 103: System

    Sefram CHAPITRE 8. SYSTEM Chapitre 8 System Ergonomic settings To set the general system settings, go to Configuration > System 8.1 : Access to system settings IGURE You’ll then be able to adjust : • Screen : brightness, screen saver •...

  • Page 104: Path To Update Access

    Sefram CHAPITRE 8. SYSTEM 8.2 : Path to update access IGURE To launch the update, you only have to click on the button « Load from WEB». The update is launched automatically. 8.3 : WEB update option selection IGURE If the update fails : Check that the device is connected to the network (Ethernet cable). User manual...

  • Page 105: Usb Key Option Selection

    Sefram CHAPITRE 8. SYSTEM Load from USB key (2) Retrieve the DAS1800 software update folder from the SEFRAM website (https ://www.sefram.com/mises-a-jour-logicielles.html). Do a save-sub and select the USB key. Use a blank USB key formatted in FAT32. Safely remove the USB key from the PC or device using the "Eject USB key" option. Plug the USB key into one of the device’s available ports To access the software update page, follow the steps below : 1.

  • Page 106: Update From File Menu

    Sefram CHAPITRE 8. SYSTEM Load from local file (3) If the other 2 semi-automatic update methods have not worked, use this one Follow the procedure below : 1. Go to « Files Manager » menu 2. Go to the « USB » submenu 3.

  • Page 107: Update Progress Pop-Up

    Sefram CHAPITRE 8. SYSTEM Update progress Once the update is launched, a pop-up window will appear to track the progress of the update. 8.6 : Update progress Pop-up IGURE Do not switch off the device during software update. If using a battery, check that the device has sufficient autonomy.

  • Page 108: Time Setting

    Sefram CHAPITRE 8. SYSTEM Once the device has started up, an information pop-up will open to confirm that the device has been updated to the new version. 8.7 : Pop-up user info IGURE Time setting 8.3.1 Manual Select the system time manually. This parameter is used if the system is isolated (without network) and loses its internal clock.

  • Page 109: Network Settings

    Sefram CHAPITRE 8. SYSTEM Network settings 8.4.1 Ethernet To connect your device to a network, go to Configuration > System > Network : 8.8 : Network configuration page IGURE It is possible to configure 2 different Ethernet networks on the device simultaneously (1). Give your network a name (3) .

  • Page 110: Enp2S0 Interface

    Sefram CHAPITRE 8. SYSTEM 8.9 : Enp2s0 Interface IGURE If your network is directly connected to a DHCP server via a router, you need to check DHCP mode (1). Your network will automatically assign an available network address to your device, thus avoiding address conflicts. In some cases, if the user does not have access to the corporate network, a point-to-point connection is requi- red.

  • Page 111: Fixed Ip Address Setting

    Sefram CHAPITRE 8. SYSTEM 8.10 : Fixed IP address setting IGURE The device is connected to the PC via ethernet cable, and the configurations are as follows : 8.11 : Manual IP configuration of PC and the recorder IGURE The configuration shown below is an example. If you have any doubts about your settings, please contact your IT department.

  • Page 112: User Level

    Sefram CHAPITRE 8. SYSTEM In a point-to-point connection, you can send SCPI commands using the supplied programming manual. This means you can edit and run your own script over an isolated connection. User level Several user levels can be defined, giving access to more or less advanced functions and information. The aim is to simplify the user interface as required: Figure 8.12: User level Viewer level:...

  • Page 113: Bug Report

    Sefram CHAPITRE 8. SYSTEM Bug report If you notice a malfunction while using the device, a dedicated bug report menu is available: Configuration > System > Bug report Figure 8.13: Créer un rapport de bogue Fill in the various fields, providing as much detail as possible. If you suspect a software problem, please check the boxes to include the system and configuration files in the report (1).

  • Page 114: Technical Specifications

    Sefram CHAPTER 9. TECHNICAL SPECIFICATIONS Chapter 9 Technical specifications User manual...
  • Page 115 High Speed Modular Data Acquisition System DAS1800 Specifications, base unit Note: All specifications apply to the unit after a temperature stabilization time of 60 minutes over an ambient temperature range of 23 °C ± 5 °C. Data Acquisition System Synchronization I/O Recording (files written to SSD) On Synchronization Connector (SUB-D 15 HD pin) Max Sampling Rate...
  • Page 116 High Speed Modular Data Acquisition System DAS1800 Specifications, measurement Modules Note: All specifications apply to the unit after a temperature stabilization time of 30 minutes over an ambient temperature range of 23 °C ± 5 °C. Universal Module (D18-UNI4) Data Acquisition Number of Channels 16 bit –...
  • Page 117 High Speed Modular Data Acquisition System DAS1800 Specifications, measurement Modules Note: All specifications apply to the unit after a temperature stabilization time of 30 minutes over an ambient temperature range of 23 °C ± 5 °C. Multiplexed Module (D18-MUX8) Number of Channels Temperature ( Thermocouple) Non-isolated differential input –...
  • Page 118 High Speed Modular Data Acquisition System DAS1800 Specifications, measurement Modules Note: All specifications apply to the unit after a temperature stabilization time of 30 minutes over an ambient temperature range of 23 °C ± 5 °C. High Voltage Module (D18-HVM4) Data Acquisition Number of Channels 16 bit - SAR...

  • Page 119: Procedure And Maintenance

    Sefram CHAPTER 10. PROCEDURE AND MAINTENANCE Chapter 10 Procedure and Maintenance 10.1 Metrology - Calibration You are in possession of a measuring instrument for which the metrological conditions of measurement are de- fined in the specifications of this manual. Climatic and environmental conditions limit the specifications of your instrument.

  • Page 120: Connecting Thermocouples And Standard/Calibrator

    Sefram CHAPTER 10. PROCEDURE AND MAINTENANCE Figure 10.2: Connecting thermocouples and standard/calibrator Step n° 2 : Channel settings to be adjusted. Figure 10.3: Adjustment settings 1. Select the channel(s) to be adjusted. 2. Select the type of thermocouple incorporated in the standard or calibrator. 3.

  • Page 121: Zero Adjustment Procedure

    Sefram CHAPTER 10. PROCEDURE AND MAINTENANCE 10.3 Zero adjustment procedure This procedure follows the instructions in the built-in video tutorial, accessible via the “Perform zero adjustment” option. It completes the explanations given in paragraph 5.5, entitled “Adjustment”. It is compatible with D18-UNI4 universal boards.

  • Page 122: Servicing

    Sefram CHAPTER 11. SERVICING Chapter 11 Servicing 11.1 For users not based in America 11.1.1 Warranty Your instrument is guaranteed for three years (36 months) parts and labor against any manufacturing defect or operating hazard. This warranty begins on the date of delivery and ends 1095 calendar days later. If the device is covered by a warranty contract, the latter supersedes or replaces the warranty conditions listed above.

  • Page 123: After-Sales Contact

    Sefram CHAPTER 11. SERVICING The warranty period for after-sales service outside the appliance warranty period is 3 months. All spare parts become the property of the user, and replaced parts become the property of SEFRAM. In the event of insurance coverage, the product becomes the property of the insurance company at its exclusive request.

  • Page 124: For Users Based In America

    Sefram CHAPTER 11. SERVICING Figure 11.1: Display areas Acceptance criteria: • Zone A (central zone): fewer than 5 defective pixels in total and fewer than 3 contiguous pixels. • Zone B (total screen area): less than 9 defective pixels over the entire screen area, with Zone A conditions met.

  • Page 125: Packaging

    Sefram CHAPTER 11. SERVICING B&K Precision Corp. : 22820 Savi Ranch Parkway Yorba Linda,CA 92887 bkprecision.com 714-921-9095 The device must be accompanied by a detailed description of the fault, and must be returned with all standard accessories (cords, plugs, etc.). Consumables (batteries, etc.) and optional accessories (case, bag, etc.) are guaranteed for 3 months against manufacturing defects.

  • Page 126: Display Areas

    Sefram CHAPTER 11. SERVICING surface. SEFRAM’s quality department has made installation of your instrument’s display conditional on compli- ance with the manufacturers’ acceptance conditions. Figure 11.2: Display areas Acceptance criteria: • Zone A (central zone): fewer than 5 defective pixels in total and fewer than 3 contiguous pixels. •...

  • Page 127: Annexes

    Chapitre 12 Annexes 12.1 Revisions Version and date Firmware version associated Modified chapters Modification type 1.0 - 10/2023 1.0.x Document creation 3.6.2 Added clarification on the choice of recording frequencies Added reset function 4.1.1 Added synchronized F(t) mode 1.1 - 01/2024 1.1.x 4.4.2 Adding FTP login credentials...

  • Page 128: Scpi Protocol

    Sefram CHAPITRE 12. ANNEXES 12.2 SCPI Protocol 12.2.1 Physical layer SCPI is based over the LAN interface that can be connected via a commercial RJ-45 cable to a network with TCP/IP protocol. The TCP port used is 23 (Telnet port) or 5025 (both are enabled on the device). 12.2.2 Command syntax SCPI commands to an instrument may either perform : •...
  • Page 129 Sefram CHAPITRE 12. ANNEXES Examples >> Send : *IDN? << Rcv : DAS1800 V0.0.4 (N0012) >> Send : VALID? << Rcv : Ch_B1 ;Ch_B2 ;Ch_B3 ; >> Send : *OPT? << Rcv : No options >> Send : DAT? << Rcv : 05,11,2022 >>...

  • Page 130: Programming Dictionary

    12.2.3 Programming dictionary Requests list HEADER DESCRIPTION RESPONSE EXEMPLE *IDN ? Identification request SEFRAM, SEFRAM 8460 Version 4.7.2 Product Name, (N :00010) Serial Numer, VersionMajor.VersionMinor *OPT ? Idendtification of options Number of acquition boards :DATe ? Return the current date Day,Month,Year 30,12,2022 :HOUrs ?

  • Page 131: Scpi Command Description

    HEADER DESCRIPTION PARAMETERS EXEMPLE *REM Start remote control *REM *LOC Stop remote control *LOC :MEMSpeed Set recording frequency Frequency (Hz) :MEMSpeed 10000 Start or stop recording on the device TRIG (useful if the device is in REC ON state « Waiting for trigger » to force starting) :START :MANual Set the start recording condition as «...

  • Page 132: Eu Declaration Of Conformity

    Sefram CHAPITRE 12. ANNEXES Example Bellow an exmple of Python implementation Listing 12.1 : SCPI python implemntation exemple i m p o r t t i m e i m p o r t t e l n e t l i b TIMEOUT = 0 .
  • Page 133 EU DECLARATION OF CONFORMITY DECLARATION DE CONFORMITE UE Manufacturer’s Name: SEFRAM INSTRUMENTS SAS Nom du fabricant : 32, rue Edouard MARTEL Manufacturer’s Address: 42009 SAINT-ETIENNE Cedex 2 (FRANCE) Adresse du fabricant : declares under sole responsibility that the below mentioned product(s) déclare sous sa seule responsabilité...

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