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Chell microDAQ-Mk2 Installation And Operating Manual

Pressure scanner acquisition system
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microDAQ-Mk2
Pressure Scanner
Acquisition System
INSTALLATION
AND
OPERATING MANUAL
info@chell.co.uk
e-mail:-
Visit the Chell website at:
http://www.chell.co.uk
Chell Instruments Ltd
Folgate House
Folgate Road
North Walsham
Norfolk NR28 0AJ
ENGLAND
Tel:
01692 500555
Fax:
01692 500088
900193-1.3

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  • Page 1 Chell Instruments Ltd Folgate House Folgate Road North Walsham Norfolk NR28 0AJ ENGLAND Tel: 01692 500555 Fax: 01692 500088 microDAQ-Mk2 Pressure Scanner Acquisition System INSTALLATION OPERATING MANUAL info@chell.co.uk e-mail:- Visit the Chell website at: http://www.chell.co.uk 900193-1.3...
  • Page 2 Chell Document No. : 900193 Issue 1.3 ECO : 2230 Date: 9 May 2016 Chell’s policy of continuously updating and improving products means that this manual may contain minor differences in specification, components and software design from the actual instrument supplied.

  • Page 3: Table Of Contents

    CONTENTS 1 Description ..........................3 1.1 General ..................................3 Specification ........................... 4 2.1 Power Supply: ................................4 2.2 CAN specifications: ..............................4 2.3 Serial specifications: ..............................4 2.4 Ethernet Specifications: ............................. 4 2.5 Operating conditions: ..............................4 2.6 Measurement specifications: ............................4 Installation and Interconnections ..................

  • Page 4: Description

    1 Description 1.1 General The microDAQ-Mk2 is a self contained acquisition system and combined pressure scanner that acquires and transmits data to a host via Ethernet or a CAN bus. It is the newest version of the popular Chell microDAQ acquisition system, now known as microDAQ-Mk1.

  • Page 5: Specification

    Specification 2.1 Power Supply: Line voltage: 8-24 VDC Absolute Max. Line voltage 25VDC Consumption: Max 4VA With a 64 channel scanner: 2.2 CAN specifications: CAN type 2.0B CAN baudrate Configurable (by internal switch) from 1M, 500K, 125K and 100K. Programmable variables: Address 0x?nn Most significant programmable device ID Address 0xn?n...

  • Page 6: Installation And Interconnections

    Installation and Interconnections 3.1 Connector – Mating connector: DEUTSCH ASDD606-09SN-HE Pin Number Designation TRIGGER IN (TTL) +8~25V SUPPLY CAN_H CAN_L Hot plugging the power to the microDAQ at the connector can cause permanent damage to the unit. Always switch the power at the power supply source. 3.3 Scanner Connector –...

  • Page 7: Operation Of The Instrument

    The microDAQ is re-zeroed by sending the appropriate command over the CAN or Ethernet link via the Chell software. The system will then average a number of zero readings and perform a re-zero. Naturally, there should be no pressure applied to the ports of the scanner when a re-zero is being performed.

  • Page 8: Hardware Trigger

    For more details on hardware trigger timing a technical paper is available – Chell document no. 900118 (this paper was developed for the CANdaq but applies to the microDAQ as well).

  • Page 9: Microdaq Configuration Webserver

    5 microDAQ Configuration Webserver 5.1 Introduction. The microDAQ web Configuration provides the means of setting up, calibrating and demonstrating the microDAQ unit from a standard PC with an ethernet port and browser. It replaces the old microDAQSetup program provided with the microDAQ-Mk1. The software is divided by tabs into seven areas of functionality, namely 'Setup’, 'Live data', 'Calibration', 'DTC Information’, ‘Advanced’, ‘Timestamp’...

  • Page 10: Common Controls Sidebar

    5.2 Common Controls Sidebar Figure 5.1 above shows the first page viewed when navigating to the webserver. The menu at the top allows the user to choose what is visible in the central window, and the sidebar shows information and has a select few commands that are useful regardless of the central page the user is on.The function of the controls on the sidebar is detailed in the subsequent table (Table 5.1) Control Function...

  • Page 11: Tcp Parameters

    Note that selecting Engineering Units for a protocol will cause the scanner addressing rate to be reduced; it is better to scale calibrated 16 bit data to engineering units within the client software. 5.3.3 TCP Parameters The TCP communication protocol parameters are shown in Figure 5.4. Options control the microDAQs IP address and subnet mask, in addition to any gateway IP address required.

  • Page 12: Can Parameters

    Local IP Address This is the IP address of the device. This address is the same as the TCP comms section. Local Subnet This is the subnet of the device. This subnet is the same as the TCP comms section. Remote UDP IP address.

  • Page 13: Live Data' Page

    5.4. 'Live Data' Page Figure 5.8 shows the 'Live Data' page of the webserver, selected for a 64 channel pressure scanner. Figure 5.6, Live Data Page The live data page is a means to demonstrating the correct operation of microDAQ and testing the unit's calibration.

  • Page 14: Calibration' Page

    5.5. 'Calibration' Page The 'Calibration' page allows access to microDAQ’s existing non DTC calibration coefficients and provides a means to acquiring live calibration data and calculating new coefficients. The loading and saving of tests is also possible from this tab. Calibrations may either be 3 temperature based for a temperature calibration, or by unchecking the 'Temperature Cal.' checkbox, a non temperature calibration may be performed at a single temperature.
  • Page 15 Control Function Temperature tickbox and radio Select at which temperature point the unit is currently been calibrated buttons Applied Pressure The engineering units pressure setpoints - user entered, or set to standard values (+/- FS, +/-0.5FS, 0) by clicking 'Defaults' Pressure (16 bit FS) The 16 bit unsigned representation of the pressure setpoints, calculated by the software...

  • Page 16: Dtc Information' Page

    5.6. 'DTC Information’ Page The 'DTC Functions' page gives the user access to some information regarding the attached DTC scanner. The scanner voltages for temperature and excitation may be read and the position of the calibration shuttle valve determined as either being in 'RUN' or 'CAL.' mode. Also, the information contained in the scanner header may be displayed.

  • Page 17: Advanced' Page

    5.7 ‘Advanced’ Page The advanced page contains functions that will change the how the microDAQ acts and how it applies various calculations to its data, this page should only be used by users who fully understand what they are changing. 5.7.1 Filtering The microDAQ has settings to allow the user flexible control over the data throughput of the device.

  • Page 18: Miscellaneous

    'Gateway’ Allows the user to change the Gateway address interface for the local connection. ‘Enable TCP/UDP User If enabled, replies with a two byte acknowledge if a user command is sent to the Command Acknowledge’ microDAQ over TCP or UDP. Ethernet Initialisation Check At bootup the Ethernet module performs two checks for auto negotiation and link Timeouts(0-30 sec)
  • Page 19 'Channels' dropdown The number of channels on the attached scanner should be chosen from the 'Channels' drop down. It is important that this number is correct when performing any calibration or reading data from microDAQ. 'Full Scale' dropdown This dropdown is the only means of selection of the scanner's full scale operating pressure.

  • Page 20: Span And Zero Coefficients

    5.7.4 Span and Zero Coefficients This section displays the Span and Zero coefficients currently stored within the microDAQ as a result of a linear calibration. Figure 5.12, Span and zero coefficients 5.9 ‘Timestamp’ page This page allows the user to edit the timestamp settings of the microDAQ. This timestamp will alow the user to get millisecond level accuracy timestamps on the data packets.
  • Page 21 ‘PTP synchronisation on’ This allows the user to select whether any timestamps that may be checkbox added to the datastream are PTP synchronised or not. Please note this will only work if there is a PTP grandmaster on the same network as the microDAQ ‘Datastream timestamp’...

  • Page 22: Service And Calibration

    6. Service and Calibration 6.1 Service There are no user serviceable parts inside the instruments. Should any difficulties be encountered in the use of the microDAQ, it is recommended that you contact Chell Instruments Ltd for advice and instructions. 6.2 Calibration Calibration is recommended on an annual basis and Chell Instruments Ltd.

  • Page 23: Microdaq-Int Connector Interface Adaptor

    7. MicroDAQ-INT Connector interface adaptor 7.1 Case Assembly 7.2 Power Connector - Mating connector 2.1mm DC power jack Pin Number Designation Center +8 to 25Vdc Outer 7.3 Can Connector – Mating connector 9 way dtype male Pin Number Designation CAN_L CAN_H 7.4 Trigger Connector - Mating connector 50 Ohm BNC Pin Number...

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