Chapter 1 – Introduction
About this Manual
1–4
Brüel & Kjær2238 Mediator
User Manual
1.1.3 Detectors
One of the main features of the Mediator is that it contains
two detectors with independent frequency weighting func-
tions, see Fig. 1.1. In the Enhanced module, one is an RMS
detector and the other can be set up to measure RMS or Peak.
This allows, for example, simultaneous measurement of A-
and C-weighted RMS and to measure and display the differ-
ence between two RMS parameters directly (for example, L
Ceq
– L
Aeq
).
Fig.1.1 Simplified block diagram for 2238 Mediator
L-filter
MUX
Aux 1
Aux 2
A-filter
C-filter
Overload detector
1/1- and 1/3-Octave
Filter Set
Correction filter
(Sound Incidence,
Windscreen)
Amplifier
10 dB/step
(Cal. adjustment)
Preamplifier
MUX
Buffer
AC out
RMS
detector
Time weighting
Buffer
DC out
Peak/RMS
detector
Digital control
and processing
Power supply
Display
Keys
Microphone
RMS 1 RMS 2
PEAK AUX1/2
External
power
supply
980362e
Batteries 6V
(4 x AA size)
Serial
interface
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