Circuit-test DMS-4420, Руководство пользователя

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CIRCUIT-TEST
DMS-4420
DMS-4420
5
3. DATA HOLD button
Readings shown on the LCD can be locked while
pressing this button.
4. Frequency Weighting select button
A: A Weighting for general sound level
measurements. C: C Weighting for checking the
low-frequency content of noise.(If the C-Weighted
level is much higher than the A-weighted level,
then there is a large amount of low-frequency
noise).
5. Time weighting select button
FAST: for normal measurements. SLOW: for
checking average level of fluctuation noise.
6. MAX/MIN hold button
6.1 Press the key to activate the function. The “MAX”
symbol appears on the display and the instrument
will show the Maximum value measured and will
automatically update itself when a greater value is
measured.
6.2 Press the key again and the “MIN” symbol
appears on the display and the instrument will
show the Minimum value measured and will
automatically update itself when a lower value is
measured.
6.3 The MAX/MIN function will be disabled if the
MAX/MIN button is pressed for more than 1
second or if the meter is turned off.