Casella CEL CEL-296 - Manual (Page 48)

parameters available from the Meter (such as SPL, Leq, Lmax,
LTm3, LTm5, LOSHA, LDOD or SEL) can be analyzed by the filter
set.
The selected centre frequency will be indicated at the centre of the
filter display, while sound levels must be read from the sound level
meter display.
If a level recorder is included in the measuring system, it can control
the frequency scanning while recording a spectrum.
To perform manual or remote controlled frequency analysis proceed
as follows.
Connect and calibrate the measuring arrangement as described in
Section 5.2.1.
2.
Set the sound level meter to measure the required parameter
according to the instructions in its handbook.
3.
Set the filter set RANGE switch to "Hi".
4.
Set the filter set MODE switch to the "MAN/Ext" position.
5. Set the filter set BAND switch to "Oct" or "1/3 Oct" depending
on the bandwidth to be measured.
The instrument always selects the "All Pass" band first, and
shows the "ALL" message as an indication.
6.
Press the filter set button to perform a manual scan
through the frequency bands, and the button to re-examine
any band.
7. Use
the or button to return the instrument to the "All
Pass' band for the particular bandwidth.
Page 48 CEL-296/3 Operator Handbook CEL Instruments Ltd