620LK Operation and Maintenance Manual – Rev. J – Updated January 2020
Page 10
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This autolock feature within the meter works by taking 16 resistance measurements in
the positive polarity and averaging them. Another 16 resistance measurements are then
taken in the negative polarity and averaged. The two averaged values from the positive
and negative polarities are then averaged together to produce the final autolocked
measurement, which is the reading displayed while the backlight is on.
To assist the user, the meter produces an audible beeping indicator along with the lit
backlight once an autolock measurement has been found. This beeping allows the user
to focus on the placement of the measurement leads, instead of on the meter’s display.
The autolock feature also enables the measurement to reset automatically if continuity
is sensed or front panel button “AUTO MEASURE RESET” is pressed. The display’s
backlight will turn off while the measurement portion of its cycle is active, and light up
when the instrument has locked on a measurement.
