Instruction manual

Preparations

Important

The life of the backup battery is about two years. To be on the

safe side, you should replace the battery every 1 to 1-1/2

years.

When the battery is removed, all stored data as well as the

time and date settings are lost. If necessary, use the printer

DPU-414, CP-10 or CP-11 to print out settings and data be-

fore changing the battery. After replacement, set the clock

and date again, as described on page 24.

The backup battery serves to maintain stored data and to

power the internal clock. Since this is not mandatory for

measurements, sound pressure level measurement and fre-

quency analysis are possible also without the backup bat-

tery.

Replacing the backup battery (lithium battery)

1. Turn power to the unit off.

2. Remove the old lithium battery.

3. Wait at least two minutes, and then insert the new lithium battery.

Note

If you insert the new battery within two minutes after remov-

ing the old battery, the unit may not operate correctly the

next time it is turned on.

4. Turn power to the unit on. The unit will come on with the factory default settings

(page 34).