7-12
Setting and Viewing Advanced Functions
Model 820 Technical Reference Manual
Step 2
Press the
r
key to access the five screens available
in the EXCD mode, including Duration, L
eq
, L
max
,
Pk, UWPK.
Step 3
To examine the properties of each exceedance
record use the
l
or
r
keys to see screens a-e.
Step 4
Press the
d
or
u
to view the next or previous
exceedance.
Setting PassBy Functions
The
PassBy Function
is a special exceedance event detector
that measures the L
max
, L
eq
, and SEL of the highest event to
raise and lower Š 10 dB in SPL. It is used to capture single
events such as a vehicle or aircraft passby, or other event
noises such as blasts or gas getting noise. In addition to the
levels measured, the date and time of the L
max
and the dura-
tion of the event are recorded.The maximum duration of
passby event may be 1 or 2 minutes depending on the shape of
the event. Maximum passby duration will be reduced if
exceedance is reduced.
Step 1
To enable the
Passby
function, turn on the Model
820 and then press
R
,
m
,
162
, and
e
. The screen will show either of two options:
[Level, PassBy].
When the Exceedance History and
Passby, parameter 66 and 162, is
enabled, a Passby record will be
created whenever a delta 10dB
event is detected (See Figure 7-2).
Step 2
Press
m
and then press
r
to [PassBy] and then
press
e
.
The occurrence time or Maximum
Level must be equal to or greater
than the RMS EXCD LVL 1
(parameter 61).
