BRUEL & KJAER Mediator 2238 - Introduction to Measurement Setup; Measurement Set-up Menu Navigation; Setting Frequency Weightings

Chapter 2 — Checking Procedure
Checking Procedure
2238 Mediator Integrating Sound Level Meter
Service Manual
Brüel&Kjær
16
Table 2.6 RMS and Peak Detector Amplitude Linearity
2.3.7 Noise
Action:
● Remove the JJ2614 ½² Microphone Adapter.
● Mount the WA0302 Microphone Simulator with the short circuit JP0169.
● Set range: Press , then until you get the 10-90dB range, then to OK.
● Set the Bandwidth/Time Weighting to Broadband/Slow: Press , select
Weightings, then until you get BB/S. Press and to set Frequency
Weighting as given in Table 2.7.
Warning: The display reading for the different Frequency Weightings must be as given in
Table 2.7.
Input
(gen.
output)
Display
dB SPL
Actual
Reading
Display
dB Peak
Actual
Reading
Ref. +36dB 130.0± 0.5 133.0± 0.5
Ref. +26dB 120.0± 0.5 123.0± 0.5
Ref. +16dB 110.0± 0.5 113.0± 0.5
Ref. +6dB 100.0± 0.3 103.0± 0.5
Ref. 94.0 97.0
Ref. –4dB
90.0± 0.3 93.0± 0.5
Ref.
–14dB
80.0± 0.5 83.0± 0.5
Ref.
–24dB
70.0± 0.5
73.0± 0.7
Ref. –34dB
60.0± 0.5
63.0± 2.0
Ref. –41dB
53.0± 0.5
N/A
Note: N/A = Not Applicable