Model 820 Technical Reference Manual
Taking a Measurement
5-7
PEAK-UWPK
The Model 820 also has a peak level detector. Its values, dur-
ing the measurement (or when stopped), are found by pressing
the
K
key.
Step 1
Access Peak values. Press
K
:
PEAK is a weighted value and rep-
resents a true Peak SPL from the
on-board Peak Detector. In this
example the PEAK is 116.2 dB and
occurred at the time and date
shown on the screen. Parameter 63
sets the level above which the
readings must go to be recorded by
the Model 820.
Step 2
The second display available from this function is
accessed by pressing the
r
key:
Parameter 63 controls the setting
for this measurement. Here the set-
ting is 74 dB, C-weighted and in
this measurement was equal to or
exceeded 46 times.
Unweighted Peak (UWPK) has two screens available as well
and are accessed with the
U
and
K
keys.
The unweighted Peak value is the
unfiltered (no A or C weighting)
signal from the Peak Detector).