BRUEL & KJAER 2694A User Manual
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BRUEL & KJAER 2694A User Manual

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16-channel DeltaTron Conditioning
Amplifiers Types 2694 A, 2694 B, 2694 C
and 2694 D
Volume 1: User Manual
English BE 1644 – 11

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Summary of Contents for BRUEL & KJAER 2694A

  • Page 1 16-channel DeltaTron Conditioning Amplifiers Types 2694 A, 2694 B, 2694 C and 2694 D Volume 1: User Manual English BE 1644 – 11...
  • Page 2 16-channel Conditioning Amplifier Type 2694 User Manual Valid for version 1.0 (or higher) of the Type 2694 Embedded Software May 2001 BE 1644−11...
  • Page 3 May 2001 BE 1644−11...
  • Page 4 Safety Considerations This apparatus has been designed and tested in accordance with IEC 61010 – 1 and EN 61010 – 1 Safety Requirements for Electrical Equipment for Measurement, Con- trol and Laborator y Use. This manual contains information and warnings which must be followed to ensure safe operation and to retain the apparatus in safe condi- tion.

  • Page 6: Table Of Contents

    Table of Contents CHAPTER 1 Introduction......................1 Setup Using Control Software....................4 Setting up Type 2694 Amplifiers ..................... 4 Serial Interface ......................... 7 CHAPTER 2 Controls and Connections .................. 9 Front Panel ..........................9 EMC Immunity........................10 CHAPTER 3 Operation Overview ..................11 Preliminary ..........................

  • Page 8: Introduction

    Chapter 1 Introduction Conditioning Amplifier Type 2694 consists of four versions: Type 2694 A − Standard version Type 2694 B − Basic version; less functionality than Type 2694 A Type 2694 C − Customised version of Type 2694 Type 2694 D − All 16 channels delivered with single and double integration filters For a simplified table showing the main features of the four units, see Table 1.2.
  • Page 9 16-channel Conditioning Amplifier Type 2694 – User Manual Fig.1.1 16-channel IEPE (DeltaTron) conditioning amplifier Fig.1.2 Block diagram of 2694 A. Note that it is identical to Type 2694 D except that Type 2694 D has single and double integration on all channels Voltage Mode 6mA Transducer Supply -10dB...
  • Page 10 CHAPTER 1 Introduction Table 1.2 Type 2694 family functionality Type Type Type Type Functions 2694 A 2694 B 2694 C 2694 D High-pass Filter 0.1 Hz High-pass Filter 1 Hz order) order) order) order) Floating/Single-ended Input Gain: –10 dB Gain: 0 dB Gain: +10 dB Gain: +20 dB Gain: +30 dB...

  • Page 11: Setup Using Control Software

    16-channel Conditioning Amplifier Type 2694 – User Manual Setup Using Control Software All parameters are set up using control software BZ 5291 via the RS–232 interface (refer to User Manual Volume 2: Interface). The Windows-based control software program is supplied with Type 2694. The soft- ware enables the conditioning amplifier to be configured for specific measurement tasks.
  • Page 12 CHAPTER 1 Introduction Fig.1.4 Type 2694 File, Link and Setup views Setting up Channel-dependent Parameters The individual parameters of the selected Type 2694 conditioning amplifier(s) can be shown in the Setup view (see Fig.1.4). These are shown in the ‘amplifier setup’ and the ‘transducer setup’...
  • Page 13 16-channel Conditioning Amplifier Type 2694 – User Manual channel if required. Note: Transducer sensitivities can only be read from TEDS. The amplifier gain is not affected by the sensitivity read. Data is only for use in the analyzers or data-acquisi- tion systems accompanying the conditioning amplifier.

  • Page 14: Serial Interface

    CHAPTER 1 Introduction Serial Interface All functions can be controlled via the serial RS–232 interface. Controlling all the parameters via the interface allows you to use Type 2694 amplifiers in automated test environments. Up to 16 Type 2694 units can be daisy-chained in a single setup on one COM port on a PC.
  • Page 15 16-channel Conditioning Amplifier Type 2694 – User Manual...

  • Page 16: Controls And Connections

    Chapter 2 Controls and Connections Front Panel Fig.2.1 Front panel of Signal Conditioning Amplifier Type 2694 Status LED RS–232 interface Green: Channel OK to next 2694 unit Red: Signal overload (daisy-chain capability) Green & Red: Transducer/ Cable failure RS–232 interface Neither: Channel disabled Chassis...

  • Page 17: Emc Immunity

    16-channel Conditioning Amplifier Type 2694 – User Manual Chassis ground and RS–232 interface ground are the same. Both are isolated from the power ground. EMC Immunity Type 2694 amplifiers do not require ferrite cable clamps to comply with EMC Emis- sion standards EN 50081–1 and EN 50081–2.

  • Page 18: Operation Overview

    Chapter 3 Operation Overview Preliminary Environmental Temperature Type 2694 conditioning amplifiers are built for portable, outdoor use and can be used over a wide temperature range extending from –10 to +55°C (14 to 131°F) at a maximum humidity of 90% RH at 40°C (104°F) (non-condensing). Electromagnetic Compatibility Type 2694 amplifiers meet the European EMC requirements EN 50081–1/2 (Emission) and EN 50082–1/2 (Immunity).
  • Page 19 16-channel Conditioning Amplifier Type 2694 – User Manual The mains adaptor (ZG 0426) supplied is a wide-range input type, which can be safely used over the following voltage and frequency ranges: 90 – 264 V AC, 40 – 65 Hz Protection against Excessive Current The power supply is equipped with an protection circuit that will turn off the ampli- fier if excessive currrent is drawn, such as when multiple outputs occur simultane-...
  • Page 20 CHAPTER 3 Operation Overview Loops can be formed by signal cables and RS–232 cables or output cables connect- ing to accompanying analyzers or data-acquisition systems. To avoid this, the accelerometer can be isolated from the structure with an isolated stud and a mica washer, when single-ended DeltaTron input is used. Most DeltaTron accelerometers have built-in insulators and thus are always isolated from the test structure and grounded through the amplifier (see Fig.3.1).
  • Page 21 16-channel Conditioning Amplifier Type 2694 – User Manual...

  • Page 22: The Use Of Control Software Bz 5291

    Chapter 4 The Use of Control Software BZ 5291 Introduction Start the program and the main window appears, divided into three sections – the File Manager, Link and Setup views (see Figures 1.4 – 1.6). These are central to controlling Type 2694’s operation. Initially, a smaller window appears within the main window where you must select the COM port(s) connecting Type 2694 to your computer.
  • Page 23 16-channel Conditioning Amplifier Type 2694 – User Manual The Help button in the taskbar is a useful function. To use it, simply right-click on the button in the task bar, release, and right-click again on the area you would like explained. This Help option works both on- and off-line. Example Setup: Attach some transducers to a Type 2694 amplifier (assume that the system is set up to measure DeltaTron transducers).
  • Page 24 CHAPTER 4 The Use of Control Software BZ 5291 The Amplifier Setup menu has a main parameter line where you can choose High- pass Filter, Optional Filter, and Output Sensitivity. Use the cursor to select the desired channel after you have selected the parameter option.
  • Page 25 16-channel Conditioning Amplifier Type 2694 – User Manual A-, B-, C-, D-Weighting: The internationally standardised filter characteristics for measuring sound. The filters comply with IEC 651 Type 0. Whenever one of these filters is selected, the parameter fields disappear, and the fixed high- and low-pass filters are automatically set to 0.1 Hz and 50 kHz respectively.
  • Page 26 CHAPTER 4 The Use of Control Software BZ 5291 Table 4.3 Display Overload types and Display Display Message on display messages in Overload Type Message on Message on PC Types Type 2694 B prioritised order 2694 A, C, D Transducer Red and Green None –...

  • Page 27: Transducer Setup

    16-channel Conditioning Amplifier Type 2694 – User Manual Reduce the cable length Calculating Maximum Cable Length for IEPE (DeltaTron) Transducers: The maxi- mum cable length in metres for standard and non-standard accelerometer cables can be calculated from – × ---------------------------- - 140000 ×...
  • Page 28 CHAPTER 4 The Use of Control Software BZ 5291 It is possible to increase the DeltaTron current by paralleling inputs, thus obtaining multiples of the supply current if desired. The output is then available on a number of channels which could, for example, be set to various gains. However, TEDS func- tionality will be disabled.
  • Page 29 16-channel Conditioning Amplifier Type 2694 – User Manual The transparent protocol, where Type 2694 works as a link between the transducer and the PC without limitations Embedded or stand-alone mode – Type 2694 has a built-in TEDS translator where Type 2694 can, via the RS–232 link, extract serial number, type number and sensi- tivity of chosen transducer types.
  • Page 30 CHAPTER 4 The Use of Control Software BZ 5291 Input Floating Input Float: Used to select single-ended or floating (differential) input mode. Select Yes for floating input. When DeltaTron mode is selected for DeltaTron/voltage input modules, single-ended mode must be selected if an alternative return path for the supply current has not been established.
  • Page 31 16-channel Conditioning Amplifier Type 2694 – User Manual...

  • Page 32: Maintenance, Service And Repair

    Chapter 5 Maintenance, Service and Repair General Maintenance Daily Use There are neither user-serviceable parts in Type 2694 amplifiers nor fuses that need replacing. Cleaning To clean the cabinet, use a soft cloth lightly moistened with an anti-static detergent suited for plastic surfaces. Although the surface of the amplifier is resistant to many chemicals, avoid using strong detergents.
  • Page 33 16-channel Conditioning Amplifier Type 2694 – User Manual Amplifier Failure In the event of the amplifier shutting down or it not being possible to turn it on, there are a number of possible causes and solutions: Heavily loaded outputs – remove loads DC supply voltage too low (<...

  • Page 34: Specifications

    Chapter 6 Specifications − Specifications Types 2694 A, B, C, D DELTATRON INPUT/VOLTAGE INPUT Channel-to-channel Phase Match (calculated Connector: values): Channel 1 to 15 − BNC ≥ 1 × f ≤ 2 degrees Channel 16 − BNT (CCLD, voltage or tacho) ≥...
  • Page 35 16-channel Conditioning Amplifier Type 2694 – User Manual Accuracy: ±0.1 dB. All gain-steps @ 1 kHz, typically Max. Floating Voltage: ±10 V between chassis and ±0.05 dB external power supply ground Always Power-on Mode: 2694 powers up as soon ENVIRONMENTAL SUSCEPTIBILITY (REFERRED TO as electrical supply is selected OUTPUT AT 40 dB GAIN) Switchable Power-on Mode: 2694 can be powered...
  • Page 36 CHAPTER 6 Specifications Compliance with Standards CE-mark indicates compliance with: EMC Directive and Low Voltage Directive. C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand Safety EN 61010−1 and IEC 61010−1: Safety requirements for electrical equipment for measurement, control and laboratory use.
  • Page 37 16-channel Conditioning Amplifier Type 2694 – User Manual...
  • Page 38 Index A-, B-, C-, D-weighting Electromagnetic compatibility ....11 ........1, 17, 18, 27, 28 EMC immunity ........ 10, 29 Environmental Electromagnetic compatibility ..11 Noise ........... 17 Bias voltage ..........19 Susceptibility ........28 Break-out cable ........28 Temperature ......11, 29 Broken cable ...........
  • Page 39 16-channel Conditioning Amplifier Type 2694 – User Manual Phase errors ..........17 Potential difference ....... 12 High-pass filters ........27 Power Consumption ........11 External ........11, 28 IEEE P1451.4 ........21, 28 Supply ..........11 IEPE ............20 Immunity EMC .............
  • Page 40 INDEX Voltage Bias ............. 19 Version number ........23 DC supply ........... 11 Mains range ........12...
  • Page 41 16-channel Conditioning Amplifier Type 2694 – User Manual...
  • Page 42 HEADQUARTERS: DK-2850 Nærum · Denmark · Telephone: +4545800500 · Fax: +4545801405 · http://www.bksv.com · e-mail: info@bksv.com Australia (02)9450-2066 · Austria 0043-1-8657400 · Brazil (011)5182-8166 · Canada (514)695-8225 · China (86) 1068029906 Czech Republic 02-67021100 · Finland (0)9-755 950 · France (01)69907100 · Germany 06103/733 5-0 · Hong Kong 25487486 · Hungary (1)2158305 Ireland (01)803 7600 ·...

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