Chapter 2 — Checking Procedure
Checking Procedure
2238 Mediator Integrating Sound Level Meter
Service Manual
Brüel & Kjær
12
2.3.1
Visual Inspection of the Microphone
Action:
●
Remove the protection grid from the microphone, inspect and remount
Results:
●
No holes, corrosion, scratches or other visual damage to the diaphragm
Fig.2.1
Typical setup for Checking Procedures
2.3.2
Outputs – Analog Output
Action:
●
Remove microphone and use adaptors JJ 2614 and JP 0144 to connect the
generator to the 2238. Use a LEMO to BNC cable to connect the 2238’s DC Output
(Aux 1 plug) to a multimeter.
●
Press
to switch the 2238’s power on. Press
, then
to select
General
.
●
Press
to set Range to
50.0
-
130.0 dB
. Press
to
OK
, then
and
to se-
lect
Weightings
. Use
to select
BB/F
on the
Bandwidth
line. Use
to go to
the
Freq. Wgt.
line, and press
until the display reads
L
. Press
to
OK
and
to
Close
.
●
If the first line of the “active” display doesn’t read
LLFP
, then press
to go to the
first parameter and use
until it does (there are 10 possible settings). Press
or
to return to the “active” display.
●
Apply an input signal of approx. 126 dBµV at 1 kHz, so that the 2238 display reads
130.0 dB
. Check the DC output voltage according to
●
Switch the cable to the 2238’s AC Output (Aux 2) and repeat.
980564e
Sine/Noise Generator
1049
Multimeter
2238
JP 0144
JJ 2614
Serial Output
AC Output
(AUX 2)
0
Brüel & Kjær
Type
2236
DC Output
(AUX 1)
Summary of Contents for Mediator 2238
Page 1: ...BI 5043 13 Technical Documentation 2238 Mediator Integrating Sound Level Meter Service Manual...
Page 2: ......
Page 7: ...2238 Mediator Integrating Sound Level Meter Service Manual BI 5043 13 1 Chapter 1 Introduction...
Page 14: ...2238 Mediator Integrating Sound Level Meter Service Manual Br el Kj r 8...