Amprobe AM-270 Industrial-Multimeter - Manual (Page 15)

9
The shortcut is to short the test leads in auto-ranging resistance mode until
the meter enters the lowest 50 range automatically, press the RANGE button
momentarily to get the “Shrt” prompt, then wait about 3 more seconds until
the display shows zero.
Note: The calibration stays until you change ranges, functions, or go back to
auto-ranging mode.
µA, mA, and A Current Functions
Default at DC. Press SELECT button momentarily to select AC.
*Note: When measuring a 3-phase system, special attention should
be taken to the phase-to-phase voltage which is significantly higher
than the phase-to-earth voltage. To avoid exceeding the voltage
rating of the protection fuse(s) accidentally, always consider the
phase-to-phase voltage as the working voltage for the protection
fuse(s).