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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

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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Index

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:

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Casella HB3340-02 Betreibershandbuch Seite 21