Technical Documentation The NEXUS™ Range of Conditioning Amplifiers Types 2690, 2691, 2692 and 2693 User Manual: Operation and Inte

The NEXUS™ Range of Conditioning Amplifiers Types 2690, 2691, 2692 and 2693 User Manual: Operation and Interface

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, Control and Laboratory Use. This manual contains information and warnings which must be followed to ensure safe operation and to retain the apparatus in safe condition. Special note should be made of the following: Safety Symbols The apparatus will be marked with this symbol when it is important that you refer to the associated warning statements given in the manual. Protective Earth Terminal Hazardous Voltage Explosion...

Introduction The NEXUS™ Range of Conditioning Amplifiers are low noise, 1-, 2-, 3- or 4-channel conditioning amplifiers with a large dynamic range. They can be configured with different input modules and different numbers of channels, according to your requirements. NEXUS Conditioning Amplifiers are equally suited for laboratory and field use and are particularly used within the automotive area. The size of NEXUS and its built-in rechargeable battery make it ideal for high-quality field measurements with a portable DAT recorder. Fig.1.1 NEXUS amplifiers are flexible – they are constructed with...

DeltaTron Input Transd. voltage overload 4.7V Input common mode overload Transd. current overload Input Common Input Common 4.7V Input common mode overload 7 pin Lemo (input plug) Zin: 1 M Ω // 300pF Preamp Input Input common mode overload Dual output buffer Charge Input 2 The NEXUS™ Range of Conditioning Amplifiers – User Manual: Operation and Interface Any combination of these input types is possible. See Fig.1.2 for a block diagram of the various types of NEXUS input modules. Block diagram of the NEXUS input modules Note: A sound intensity probe requires two input channels. It is not necessary...

The most commonly used NEXUS combinations have been made as standard types: a. See also Product Data (BP 1976) A NEXUS Conditioning Amplifier can always be updated to another configuration if required. For calibration and reliability reasons the unit must be returned to Bruel&Kj^r for updating. In addition to the various input configurations you can also configure your NEXUS Amplifier with special filters, such as: A-, B-, C- and D-weighting and single/double integration. Refer to NEXUS Order Form BA 0287 for information about customer specified configurations.

The NEXUS™ Range of Conditioning Amplifiers - User Manual: Operation and Interface All parameters are set up from the six soft-keys on the front panel or via the RS-232 interface (refer to Part 2: Interface). The following set-up menus are used: • Amplifier Set-up: For setting up filters and gain for each individual channel, and displays information about battery capacity and overload condition • Transducer Set-up: For choosing DeltaTron or “direct voltage” input and selecting preamplifier input or intensity input. For entering the calibrated sensitivity of the transducer. For identifying transducers...

The following chapters describe the operation of the NEXUS serial interface: • Chapter 7: Specifications and the set-up procedure for the serial interface • Chapter 8: Interface message formats • Chapters 9 and 10: How the individual messages are used in the control of data flow between a NEXUS unit and an interface controller. Chapter 9 is solely about channel independent messages • Chapter 11: Interface error messages • Chapter 12: Summary of interface commands

The NEXUS™ Range of Conditioning Amplifiers – User Manual: Operation and Interfac

The NEXUS™ Range of Conditioning Amplifiers – User Manual: Operation and Interfac

Chapter 2 Controls and Connections 2.1 Front Panel Fig.2.1 Front panel of NEXUS Conditioning Amplifier showing the Amplifier Set-up menu On/Off key. When switched off, nearly all circuits in the instrument, including the interface and the charging circuit, are switched off. Note: The battery will discharge if left in the instrument for a long period. Refer to Note 2 in section 3.1.2. The six soft-keys on the front panel allow you to select menus and options and to specify parameter values. The function of the keys depends on the selected menu. The current function will appear on the display above...

The NEXUS™ Range of Conditioning Amplifiers – User Manual: Operation and Interface Back Panel Fig.2.2 Back panel of NEXUS Conditioning Amplifier Serial interface socket for remote control and output of measurement results (see Vol. 2). The RS–232 Host connector is a 9-pin D-range female connector which is used for connection to a PC, a remote control unit or the previous NEXUS unit in a “daisy-chain” set-up. NEXUS units with a total of up to 99 channels can be “daisy-chained”. Warning: Switch off all equipment before connecting or disconnecting the digital interface. Failure to do so could damage...

CHAPTER 2 Controls and Connections Warning: If floating input is selected, care must be taken to limit the signal ground current in order to prevent electrical hazards. Maximum is 50 mA. The instrument will limit the voltage to 20 V, to prevent hazardous voltages. Output Ch. 1 to 4 Up to four BNC output sockets. You can select grounded or floating mode. The output is protected against short-circuits and voltage overload, even when the instrument is switched off. Warning: If floating output is selected, care must be taken to limit the signal ground current in order to prevent electrical hazards....

The NEXUS™ Range of Conditioning Amplifiers – User Manual: Operation and Interfac

Chapter 3 Operation Overview 3.1 Environmental Temperature NEXUS Conditioning Amplifiers are built for portable outdoor use and may 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 As mentioned in section 2.3, NEXUS Amplifiers meet the European EMC requirements EN 50081–1/2 (Emission) and EN 50082–1/2 (Immunity). With special reference to the harsh electrical environment in cars they also meet the strict requirements os ISO 7637–1 and ISO 7637–2 “Road Vehicles – Electrical...