3-2
Calibrating the Model 820
Model 820 Technical Reference Manual
setup parameter 43. To do this turn on the Model
820, press
R
,
m
,
4
and
3
, and
e
. The
following display will appear:
The flashing (f), the Keyboard Sta-
tus Indicator, displays which key
functions are active. This indicates
that the function keys are used for
different purpose in current func-
tion.
Step 2
Should the brackets contain a value other than [200]
e.g. [28] or [0], press the
r
until the value [200]
appears, and then press
e
. If you are using a
pre-polarized microphone, this parameter should be
set to 0.
In this screen the value [200} is
selected from three options: [200,
28, 0]
Step 3
Press
c
to return to the main screen:
Step 4
To begin the calibration process check or insert the
new calibration level given in parameter 35. To do
this press
R
,
m
,
3
and
5
, then
e
. The
following screen will appear:
The Larson-Davis Model CAL200
calibrator outputs 114 dB or 94 dB
re20 µPa. Note that the Model 820
automatically uses the C-weight-
ing while calibrating. This ensures
a correct reading at typical cali-
bration frequencies of 250 Hz to 1
kHz.
