Lcd Backlight; Maximum And Minimum Readings; Relative (Rel) Mode - Extech Instruments EX520A User Manual

5
Operation

5.3 LCD Backlight

The LCD is equipped with backlighting for easier viewing, especially in dimly
lit areas. Long press the backlight button
off. The backlight automatically switches off after 5 minutes.

5.4 Maximum and Minimum Readings

Note: When using the MAX/MIN function in Auto Range mode, the range that
is active when the MAX/MIN button is pressed will be locked. If a reading ex-
ceeds that range, OL will appear. Select the desired range before entering
MAX/MIN mode.
1. Press the MAX/MIN button to toggle the maximum and minimum reading
displays. The MAX and MIN display icons show the selected mode. In
these modes, the display will only update when a higher (MAX) or lower
(MIN) reading is measured.
2. Long press the MAX/MIN button to return to the normal mode of operation.

5.5 Relative (REL) Mode

The Relative (zero) feature allows you to make measurements relative to a
stored reference value. In other words, a reference voltage, current, etc. can
be stored, and subsequent measurements can be made in comparison to that
value. The displayed value is the difference between the reference and the
measured value.
The Relative function does not operate in the Frequency measurement mode.
1. Take a measurement as described in the operating instructions.
2. Press the REL button to store the reading, the REL indicator will appear
on the display.
3. The display will now indicate the difference between the stored value and
the measured value.
4. Press the REL button to exit the relative mode.
#NAS100179; r. AA/97576/97580; en-US
to switch the backlight on or
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