Model 820 Technical Reference Manual
Taking a Measurement
5-3
Step 4
Press the
d
key again for the second screen:
The Peak and Unweighted Peak
are displayed here. Note that even
in the stop mode, the Model 820
continues to display the detected
values on the upper right hand
side of the screen.
The numbers on the left are the
highest during the measurement
and the values on the right are the
current Peak and Unweighted
Peak.
Step 5
Press the
d
key for the third screen:
The L
eq
values are shown here to
be 85.5 dB, C-weighted, the mea-
surement ran for nearly four min-
utes. Should one of four letters,
(OVLD), flash intermittently with
the stick figure, an Overload has
occurred in this measurement (see
Chapter 7).
Step 6
Press the
d
key for the fourth screen:
The SEL level (using 3dB
exchange rate) is 109.1 dB and the
duration of the measurement is
given.
Step 7
The next screen addresses the Alarm time and cur-
rent temperature. Press the
d
key and the fifth
screen will appear:
The Alarm can be set to begin a
measurement at a designated time.
The “??:??” here indicates the
next measurement has not been
chosen. The current internal tem-
perature as measured by the Model
820 is shown in the lower portion
of the screen.
