620 Series
11
Operation
This section describes how to use the instrument to take noise measurements using the
minimum of settings.
Once the instrument has been prepared for use, it should be field calibrated as described later
in this section.
Care should be taken that the operator does not unduly affect the sound field. Ideally the
instrument should be mounted on a sturdy tripod with the microphone perpendicular to the
source of the sound to be measured – the operator should be as far behind the instrument as
possible. If the instrument is to be hand-held, then the instrument should be held out as far
as possible to minimise reflections from the operator’s body.
Batteries
To extend battery life, if the 620 series is not taking a measurement and there are no key
presses, the instrument will automatically turn off after a period of 5 minutes. This auto
power off facility is disabled when the 620 series is powered from external 12VDC or USB.
For long term tests, where the batteries may become exhausted, use a 12VDC supply to
power the 620 series. The auto power off facility is independent of the backlight time
settings.
Note: The 12VDC can be plugged in at any time and will be automatically used instead of the
batteries. With 12VDC or USB connected the battery condition symbol will show full charge
and not the actual condition of any installed batteries.
Note:. When downloading data to a PC the 620 series can be powered by the USB
connection. The 12VDC or USB connection will not re-charge batteries.
To fit the batteries (see figure 4):
1. Open the battery cover.
2. Check the battery compartment is clean and dry.
3. Fit three new AA Alkaline (or NiMH) batteries according to the polarity in the battery
compartment.
4. Close the battery cover.
5. Always fit new batteries when the battery indicator shows battery strength is low to
prevent the instrument switching OFF while in use.
Note: If there is evidence of leakage from previously installed batteries, contact Casella
before using the instrument.
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