Model 820 Technical Reference Manual
Setting and Viewing Advanced Functions
7-5
Step 2
View the start and stop times and date by pressing
the
r
key:
Step 3
Go back to LOG-a by pressing the
r
key. Toggle
through the record logs by pressing
d
:
The Log information indicates that
the measurement was stopped by
keystroke. If a low battery had
been the reason for the measure-
ment stopping, “BATT” would
have appeared. To retain data
already gathered, the Model 820
will terminate the measurement
when battery power becomes low.
Step 4
The
u
and
d
keys may be used to look at addi-
tional records. Press the
r
to look at associated
dates and times.
Interval History
The
Interval History
Parameters allow you to select and define
the interval size and determine what data are to be saved.
Each interval gives you L
eq
, SEL, Min, Max, Peak, UWPK,
Exceedance count, and, if you turn this feature on, L
n
’s. Listed
below is each parameter and a brief explanation of its function.
Step 1
To access the
Interval History
parameters press
OR M
. You may also use numeric values,
i.e.
OR m 7 2
e
. The choices
are:
[Yes, No]
With this item set to (Yes), the
Interval Time History (ITH) is
enabled. Note: Be sure that total
memory requirements do not
exceed available memory.
Step 2
Press the
d
to access the next parameter, 73,
Intv
Exchange Rate for these choices
:
[3dB, 4dB, 5dB, 6dB]
This parameter is the exchange
rate used for each interval. Set this
to 3 dB for community noise and 5
dB for OSHA studies.
