Casella CEL CEL-296 - Manual (Page 16)

nor storage facilities, and the filter band centre frequency is moved
to the middle of the display for convenient viewing.
Figure 4 shows the full annotation provided by the display, where
the remaining indicators are as follows.
OVERLOAD
This indicates either that the filter set itself is being overloaded, or
that the sound level meter is overloaded (provided it is equipped
with the CEL low power serial interface).
If the filter set is overloaded, the indication will remain displayed for
up to two seconds beyond the duration of the overload condition.
However, when triggered by the overload indicator in the sound
level meter, the indication will be cleared only when the sound level
meter condition is cleared.
When OVERLOAD is indicated during an autoscan, the scan is
interrupted, and restarted from the first band to ensure that only
valid data is stored in the memory. If OVERLOAD is indicated
during a manual or remotely stepped measurement, the instrument
settings must be corrected to remove it from the display. Either
select a higher range on the sound level meter, or move the filter set
range switch from "Lo" to "Hi".
1 /3 OCTAVE
This shows that the selected bandwidth for measurement is set to
1/3 octaves stepping at 1/3 octave intervals, or that the recall of
stored spectra is from the 1/3 octave memory bank (see Spectrum
Storage Facilities below).
OCTAVE
This shows that the selected bandwidth for measurement is set to
octaves stepping at octave intervals, or that the recall of stored
spectra is from the octave memory bank (see below).
Page 16 CEL-296/3 Operator Handbook CEL Instruments Ltd