Rel Ac+Dc Button; Rel Function; Ac+Dc Function - Sonel CMM-30 Manual De Uso

6.2 REL AC+DC button

6.2.1 REL function

This mode enables a measurement relative to a reference value.
 To enable the mode, press REL AC+DC. Then, the displayed
readout value is taken as the reference value, and the readout will
be reset.
 From this moment, the readings will be presented as the ratio of
the measured value to the reference value.
 To enable the mode, press REL AC+DC.
The displayed main result is the difference between the reference
value (read-out at the moment of activating REL mode) and the cur-
rent read-out. Example: if the reference value is 20 A, and the cur-
rent reading is 12.5 A, then the main result on the display will be
-7.5 A. If the new reading is identical to the reference value, then
the result will be zero.
 When the function is activated, the automatic adjustment
of the measuring range is not available.
 If the reading is outside the measurement range, symbol
OL is displayed In this situation, turn off the function and
manually switch to a higher range (use RANGE button).
 This function is not available for measuring frequency, du-
ty cycle, diode test, continuity, temperature and Low Z.

6.2.2 AC+DC function

The reading is the sum of periodic and constant components.
 To enable the mode press and hold REL AC+DC button for ap-
prox. 2 seconds.
 To enable the mode, press and hold REL AC+DC.
This function is available only when measuring AC or DC
voltage.
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CMM-30 – USER MANUAL