GE 37 400, Technical Reference And Operating Manual

Page: 206 / 306

5 Operation Evaluation according to the DGS method
5-130 Issue 2 (12/2013) USM 36
Sound attenuation and transfer correction
There are two possibilities for setting the sound attenu-
ation in the test object:
● before the DGS calibration
in the DGS function group REF CORR using the func-
tion REF ATTEN
● at any time (even after the DGS calibration)
in the function group MAT ATTN using the function
TEST ATTEN
The transfer corrections can be set as follows:
● before the DGS calibration
in the DGS function group REF CORR using the func-
tion AMPL CORRECT
● at any time (even after the DGS calibration)
in the function group MAT ATTN using the function
TRANSFER CORR.
The settings of the functions AMPL CORRECT and
TRANSFER CORR. have an additive effect, likewise
the settings of the functions REF ATTEN and TEST
ATTEN .
Using multiple DGS curves
After turning the DGS evaluation on, at least one curve
is displayed for a certain ERS (equivalent reflector size).
For some test specifications according to DGS, certain
tolerance limits in dB below and/or above this curve
must be monitored.
You can set up to four additional curves by adjusting
their offsets from the original curve in dB values. These
curves have no effect on the displayed measurement
reading or on other settings.