Multimeter Operating Instructions; Autoranging/Manual Range Selection; Maximum (Max), Minimum (Min), And Max Minus Min Modes; Relative Zero Mode - Extech Instruments MM750W User Manual

Multimeter Operating Instructions

WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very
dangerous; please measure with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is not in use.
2. When Manual ranging, if 'OL' appears in the display during a measurement, the
value exceeds the selected range. Change to a higher range.

AUTORANGING/MANUAL RANGE SELECTION

The meter defaults to the Auto Range mode. This automatically selects the best range
for measurements and is generally the best mode for most measurements. For Manual
Range operation:
1. Press the R (Range) button. The "AUTO" display indicator will disappear.
2. Press the R key to step through available ranges until you select the desired range.
3. Long press R to exit to return to Auto Range mode.
Note: Manual ranging does not apply for the Capacitance and Frequency functions.

MAXIMUM (MAX), MINIMUM (MIN), and MAX minus MIN modes

Note: The Auto Range function is not available in MAX/MIN mode. Please select the
desired range manually before entering MAX/MIN mode. If the reading exceeds that
range, 'OL' will appear. Auto Range mode will re-activate when you exit MAX/MIN mode.
1. Short press MAX/MIN to activate the MAX/MIN recording mode. The display icon
"MAX" will appear. The meter will display and hold the maximum reading and will
update only when a new "max" occurs.
2. Press MAX/MIN again and the display icon "MIN" will appear. The meter will display
and hold the minimum reading and will update only when a new "min" occurs.
3. Press MAX/MIN again and the display icon "MAX-MIN" will appear. The meter will
display and hold the MAX minus the MIN reading.
4. Long press MAX/MIN to exit.

RELATIVE ZERO MODE

The relative measurement feature allows you to make measurements relative to a
stored reference. In this mode, the displayed value represents the difference between
the reference and the measured value. Also, use this button to zero the display by
removing stray signals before taking a reading.
1. Take a measurement.
2. Press the REL button to store the reading; the relative
3. The display will then indicate the difference between the stored value and
subsequent measurements.
4. Press the REL button to exit the relative mode.
8
icon will appear.
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