BRUEL & KJAER 2221 - Controls; Front Panel Controls and Display; Function and Mode Operation

FUNCTION:
2. CONTROLS
Random Incidence •
Adaptor
Microphone ------ 1
Microphone Adaptor ------ 1
leq f'anta
·- ··
·- ··
Range Selector --+---• ::':
...,
Display --+---
Mode ,_
Windscreen
--+--Reset
Mode Selector --+--- 1tua ,..... Off Oa---t-- On - Off
llriW
a~Q~W + Type 2222
Fig. 2. 1. Front view of the Sound Level Meter
Four position slide-switch for selection of the operating mode as
follows:
"Leq": The current Leq value is displayed and updated twice per sec-
ond. The
maximum measurement period with direct display of the result
is 2, 77 hours. For measurements over periods longer than 2, 77 hours,
the
Leq can be determined from the SEL value and the elapsed time (see
section 3.5. 7).
"SEL": Operates the SEL calculation mode, and the measurement
result is directly displayed. The measurement period is only limited by
the
battery life.
5