Larson Davis PRM2103, Reference Manual

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PRM2103 Reference Manual Setting PRM2103-FF Corrections 2-6
2.6 Setting PRM2103-FF Corrections
TAKE NOTE
It is important to
select the proper correction.
Failure to do this will result in a
measurement that is not IEC
61672-1 Class 1 compliant.
The model 831 sound level meters provide corrections for the PRM2103-
FF with EPS2116, EPS2106-3, or EPS2108-3 to produce a response that
complies with the requirements of IEC 61672-1. These correction filters
correct for the effects of the 377B02 microphone response and protection
system. The selected correction is displayed on the meter whenever the
preamplifier is connected or disconnected, as shown in FIGURE 2-6.
There are microphone corrections available in the SoundAdvisor and
Model 831 to be applied the PRM2103, and three are applicable to the
PRM2103-FF, as follows:
FF:RI 2116 and FF:RI 2106/8
Provides random incidence response.
FF:FF 2116 and FF:FF 2106/8
Provides corrected free-field response. This is usually selected when
aiming the microphone for 0° measurements.
FF:90 2116 and FF:90 2106/8
Provides 90° response. This is usually selected when microphone
placement is on a vertical pole but 90° measurements are needed.
To set PRM2103-FF microphone corrections, follow these steps:
TAKE NOTE
When using the
PRM2103-FF with the EPS2116,
select only corrections that
include 2116 in the name.
When using the PRM2103-FF
with the EPS2106 or EPS2108,
select only corrections that
include 2106/8 in the name.
Step 1 On the SoundAdvisor or Model 831, navigate Tools

System
Properties

Preferences ,
Step 2 Select the Mic Corr. field and then choose the needed
correction.
Figure 2-9 shows the Model 831 microphone corrections for the PRM2103-
FF. These are the same for the 831C.
FIGURE 2-9 PRM2103-FF Microphone Corrections