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BRUEL & KJAER NEXUS 2690 User Manual

BRUEL & KJAER NEXUS 2690
66 pages
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BI 504212
Technical
Documentation
The NEXUS
Range of
Conditioning Amplifiers
Types 2690, 2691, 2692 and 2693
Service Manual

Table of Contents

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BRUEL & KJAER NEXUS 2690 Specifications

General IconGeneral
Input Channels1
Input ConnectorBNC
Output ConnectorBNC
Weight1.2 kg
TypePreamplifier
Frequency Range0.1 Hz to 200 kHz
Common Mode Rejection Ratio> 100 dB (DC to 10 kHz)

Summary

Safety Considerations

Safety Symbols

Explains safety symbols and associated warnings in the manual.

Explosion Hazard

Specifies that the apparatus is not for explosive environments.

Warnings

Crucial safety warnings for operation and maintenance.

General Information

Edition Number

Document revision tracking and identification.

Safety

Safety requirements and precautions for operating the instrument.

Instrument Versions

Details on hardware and software version identification.

Service Policy

Information on repair, exchange, and spare parts.

Calibration and Testing

Procedures and types of calibration and testing services.

Special Tools and Equipment

Lists necessary tools for checking and adjustment.

Front Panel

Description of controls and indicators on the front of the unit.

Back Panel

Details of connectors and ports on the rear of the unit.

EMC Immunity

Guidelines for EMC compliance and ferrite clamp usage.

Service Note

General

Information on updates and changes released via Service Notes.

Checking Procedure

Introduction

Overview of checking procedures and modes.

Self-test Procedure

Instructions for running the built-in digital self-test.

Manual Checking Procedure

Guidance on manually checking analogue circuitry.

Checking Charge Channels ZX 2692

Detailed checks for charge input channels.

Checking Microphone Channels ZX 2690 and Sound Intensity Channels ZX 2691

Procedures for microphone and sound intensity channels.

Checking DeltaTron Channels ZX 2693

Procedures for DeltaTron input channels.

Mechanical Assembly

Dismantling the Display Unit

Steps to remove the display unit from the casing.

Dismantling the Motherboard (ZE 0785)

Instructions for removing the main motherboard.

Dismantling a Channel

Procedure for removing individual input/output channels.

Dismantling the Main Processor Board

Steps to remove the main processor board.

Dismantling the Rear Circuit Board (ZE 0786)

Procedure for removing the rear circuit board.

Servicing the NEXUS using ATAC

Introduction

User guide for ATAC calibration software for servicing NEXUS.

Main Menu

Overview of the ATAC software main menu options.

Service 269X Menu

Accessing service functions like adjustment and correction.

Connecting the NEXUS

Required connections for ATAC system setup.

Correction Factors

Measuring and downloading channel correction factors.

Adjust Polarization Voltage

Measuring and adjusting polarization voltage.

Adjust Frequency Response

Manual adjustment of frequency response via potentiometers.

Set Configuration

Configuring channel types and AUX modules.

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