Maintenance; Cleaning; Calibration - Unitest 93517 Bedienungsanleitung

Deleting the saved measurement data
• Switch off the instrument
• Before switching on the instrument, press the MEM key (7) and keep it pres-
sed.
• Now, switch on the instrument. The symbol "CLr" briefly appears on the dis-
play.
6.0

Maintenance

When using the instrument in compliance with the instruction manual, no special
maintenance is required. Should operational problems occur during daily use, our
consulting service will be at your disposal, free of charge.
6.1

Cleaning

If the instrument is dirty after daily usage, it is advised to clean it by using a humid
cloth and a mild household detergent.
Prior to cleaning, ensure that instrument is switched off and disconnected from ex-
ternal voltage supply and any other instruments connected (such as UUT, control
instruments, etc.).
Never use acid detergents or dissolvants for cleaning.
6.2

Calibration

A conventional calibrator at 94 dB and 1 kHz can be used for precise calibration. It
is recommended to proceed as follows:
• Set frequency evaluation filter (4) to dB(A) and the time evaluation (5) to FAST.
Make sure that the MIN/ MAX function is not activated. I.e. the symbol "min"
(18) or "max" (17) must not be displayed.
• Connect the calibrator onto your Sound level meter.
Please refer to the calibrator instruction manual for correct calibrator opera-
tion.
• Using the screwdriver (12) supplied with the instrument, turn the lateral ad-
justment screw (12) until the Sound level meter indicates 94 dB.
• Remove the calibrator again. Now, you may perform the measurements as
usual.
We recommend a calibration interval of one year.
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