BRUEL & KJAER Mediator 2238 - Table of Contents

2238 Mediator Integrating Sound Level Meter
Service Manual
BI5043–13
v
Contents
1. Introduction........................................................................................................................... 1
1.1 About 2238 Mediator™................................................................................................... 2
1.2 Standards .......................................................................................................................... 2
1.3 Basic Configuration.......................................................................................................... 2
1.4 How Mediator Works....................................................................................................... 2
1.5 Detectors........................................................................................................................... 3
1.6 Application Programs....................................................................................................... 3
1.7 Changing Application ...................................................................................................... 4
1.8 Installing, Upgrading, or Removing Applications .......................................................... 4
1.9 Specifications.................................................................................................................... 4
1.10 Filter Set............................................................................................................................ 4
Upgrading Filter Set.................................................................................................... 5
1.11 Service ............................................................................................................................... 5
Service Notes................................................................................................................ 5
Exchange Scheme........................................................................................................ 5
How to Order an Entire 2238 as an FRP..................................................................... 5
1.12 Mechanical Spare Parts .................................................................................................... 6
1.13 Repair................................................................................................................................ 6
Types of Repair............................................................................................................ 6
Replacement of Entire Unit as FRP............................................................................. 6
Special Tools and Equipment...................................................................................... 6
1.14 About Calibration............................................................................................................. 7
2. Checking Procedure......................................................................................................... 9
2.1 Pushkey Definitions........................................................................................................ 10
2.2 Introduction.................................................................................................................... 11
Results Not Achieved................................................................................................. 11
Special Tools and Equipment.................................................................................... 11
Preparation................................................................................................................ 11
2.3 Checking Procedure........................................................................................................ 11
Visual Inspection of the Microphone....................................................................... 12
Outputs– Analog Output.......................................................................................... 12
Frequency Weighting................................................................................................ 13
Overload..................................................................................................................... 14
Measuring Range–Attenuator Accuracy................................................................. 14
Detectors–Amplitude Linearity of RMS and Peak Detectors ................................. 15
Noise........................................................................................................................... 16
External Power Supply .............................................................................................. 17
Crest Factor Test (Crest Factor=3)............................................................................ 18
Tone Burst Test.......................................................................................................... 18