Sonel CMM-30, User Manual, Page: 61 / 116

CMM-30 – USER MANUAL
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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.