Larson Davis System 824, Technical Reference Manual

Page: 50 / 673

2-10 824 Reference Manual 9/29/09
Changing the displayed secondary parameter
Step 1 To select the secondary parameter to be displayed
(Leq in this example), use the
u
or
d
keys to
highlight the Leq label.
Step 2 Press the
r
or
l
arrow keys to display the val-
ues of A-weighted SEL, Lmin, Lmax, Lpeak val-
ues. Select “Peak” and press the check
c
key.
Changing the frequency weighting of the displayed Lpeak value
Step 1 With the Peak label selected, press the
u
or
d
keys to highlight the Peak weighting.
Use the
r
or
l
arrow keys to display the A, C or Flat
weighted Lpeak values.
Changing the amplitude range, or input Gain
When using the SSA ID, as in this example, the
measurement range is 80 dB, unlike the ISM and LOG IDs
for which it is 105 dB. In order to optimize a particular
measurement, provisions have been made to select a value
of input gain directly from the graphic display. The gain can