Relative Mode; Auto Power Off; Maintenance - Extech Instruments EX330 User Manual

RELATIVE MODE

The relative measurement feature allows you to make measurements relative to a stored reference
value. A reference voltage, current, etc. can be stored so that subsequent measurements can be
made in comparison to that value. The displayed value is the difference between the reference
value and the measured value.
1. Perform the 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 stored value and subsequent
measurements.
4. Press the REL button to exit the relative mode.
Note: The Relative mode is not available when measuring Frequency or Duty Cycle.

AUTO POWER OFF

The meter will automatically turn off after 15 minutes of inactivity. This will conserve battery energy. To
turn the meter on after an Auto Power OFF, simply turn the rotary switch to OFF and then back to the
desired setting.

Maintenance

WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before
removing the back cover or the battery or fuse covers.
WARNING: To avoid electric shock, do not operate your meter until the battery and fuse covers are
in place and fastened securely.
This MultiMeter is designed to provide years of dependable service, if the following care instructions
are performed:
1. KEEP THE METER DRY. If it gets wet, dry it immediately.
2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature extremes can
shorten the life of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the electronic
parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT use
chemicals, cleaning solvents, or detergents.
5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove old or
weak batteries so they do not leak and damage the unit.
6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the batteries should be
removed to prevent damage to the unit.
10 EX330-EN v5.0 06/14