Casella CEL CEL-450 - Manual (Page 19)

2. PRELIMINARY OPERATIONS
2.1 Select Instrument Configuration
(Language, Microphone Response Etc.)
Select the language in which the instrument will present menu options.
This should be the first operation so that the displays and options will be
understood.
Similarly, to get the most accurate results, these instruments
must be operated with a known microphone directional response and be
calibrated for this response.
When the language and microphone response are known to be
correct for the proposed measurement task, go directly to Section 2.2
Calibration Check.
European IEC standards require measurements to be performed
with microphones that have a Free Field response, while the U.S.A.
ANSI standards require Random Incidence microphones. The micro-
phone response is set via the Configuration menu.
Normally, these more permanent characteristics must be set
only once, as the instrument will store the settings and use them the
next time it is switched on.
Proceed as follows.
Operation Press Display Shows Comments
1. Switch the
instrument
ON
Start up messages are
displayed that include:
Instrument Type,
Firmware Version, Etc.
Finally, the Configuration
screen is displayed with
Battery Voltage, followed by
the Calibration check screen.
2. Select the
Main menu
2 times
This is the Main menu.
It gives access to further
menus that select:
Measurement Mode,
Measurement Setup,
Calibration Sequence,
Timers
Data Recall from Memory,
Instrument Configuration,
Status.
CEL-450/490 Operators Handbook - Page 19
Preliminary Operations