BRUEL & KJAER 2221 User Manual

3. OPERATION
3.1. INTRODUCTION
This Instruction Manual describes the use of the Precision Integrating Sound Level Meters
Types 2221 and 2222. However, more general considerations on sound measurement
techniques must be taken in account, and are given in the accompanying booklet "Mea-
suring Sound". To obtain valid results it is also important that the measurements are
carried out according to the relevant national or international standards.
3.2. BATTERY INSTALLATION
The Type 2221/22 is powered by 3 alkaline cells 1 ,5 V, IEC Type LR 6 (8 & K no. QB 0013).
These must be replaced when "BAT" symbol is indicated by the display.
To install new cells slide off the battery compartment cover. See Fig.3.1. Remove the
depleted cells and insert new ones with polari-ties as shown inside the battery compart-
ment. Slide on the battery cover .
............
Fig. 3. 1. Battery replacement
It is recommended to use only alkaline cells. Other types of dry cell will have a short life
time and may leak when exhausted. New alkaline cells will provide approximately 10
hours of continuous operation.
Remove the batteries and keep the instrument in a dry place for long periods of storage.
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BRUEL & KJAER 2221 Specifications

General

Brand	BRUEL & KJAER
Model	2221
Category	Measuring Instruments
Language	English