Using an external power supply
The CR:800C can be used with an
external power supply. When the
external supply is connected, the
CR:800C switches automatically from the
internal battery power.
When the external power is either
removed or switched off, the instrument
will automatically switch back to the
internal battery supply.
When an external supply is connected, the display of the instrument will show a symbol
in the top right corner as shown below.
Windshield
The CR:800C Series can be used with a UA:237 90mm foam windshield which will
reduce the noise levels generated by air turbulence over the microphone capsule.
The windshield can also be used to protect the microphone capsule of the sound level
meter from dust and fluids which may affect the performance of the instrument. To use
the UA:237 windshield, push the hole in the windshield over the microphone of the
sound level meter. The UA:237 windshield must be removed before the sound level
meter can be calibrated.
NK:70 Random Incidence Adaptor
The NK:70 Random Incidence Adaptor is designed to modify the
response of the microphone capsule from Free Field to Random
Incidence in order to comply with the requirements of ANSI
S1.4.
For instruments supplied for use outside of the USA, this
adaptor may not be supplied.
To fit the NK:70 Random Incidence Adaptor, push the adaptor
over the microphone grill. Do not attempt to remove the
microphone grill as this may cause damage to the capsule.
To calibrate the instrument remove the NK:70 Adaptor. Do Not
attempt to calibrate the instrument with the NK:70 fitted.
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