Casella CEL CEL-62X - Manual (Page 21)

M. SYSTEM TOOLS (Refer to Figure 17)
The system tools menu can be accessed from the startup screen by pressing the
left/right cursor keys (C) together. Note that these functions need not be used within
general operation and stored results will be lost if incorrectly used. Their primary
function is for calibration laboratories or diagnostic purposes. Three options are
available:
‘Recover USB Disk Files’ copies files stored in the backup E 2 memory to the USB
disk.
‘Set USB Disk R/W’ allows the mass storage device to have data written to it. Note
that this is primarily used for testing purposes.
‘Format All Memory’ will format the USB memory. CAUTION: All measurement data
will be lost!
Use cursor keys (C) to highlight the required option and press (B) to select. When
selected a final confirmation will be shown, press (A) to confirm or (B) to cancel.
Once finished, press (A) to exit.
Figure 17 System Tools
4. STORAGE
Keep the Instrument and the associated equipment in its padded case at all times
when not in use. Keep the Instrument dry, in a dust free environment, and away from
heat generating and ozone generating sources. If the Instrument is not going to be
used for a week or longer, remove the batteries from the battery compartments.
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5. LOW AND HIGH SOUND LEVELS
Low Level Sounds.
Providing the sound level being measured is within the linearity range (refer to
Appendix B paragraph “e - Linear operating range”), self generated noise and
linearity corrections can be ignored.
When the measured RMS sound level is below the linearity range and 3 dB above
the self generated noise (refer to Appendix B paragraph “h - Self generated noise), it
is possible to correct the measured level by the following formula:
Casella CEL Limited 21