Operation; Meter Power; Automatic Power Off - Extech Instruments CG304 User Manual

Operation

Meter Power

Install two 'AAA' 1.5 V batteries into the rear battery compartment. Press the power button
to switch the meter ON. The display will switch ON. If the display does not switch ON, install or
replace the batteries. When powering up, please keep the meter at least 10cm (4") from metal
objects. Replace the batteries when the battery status icon appears low, the meter will give
inaccurate readings if the battery voltage falls very low.
Measurements
Before each measurement session please perform a Zero Calibration as described later in this
User Guide. Practice with the film and zero (round) reference metal substrates to learn how the
meter operates before moving to a professional application. The heavier metal substrate is the
ferrous (magnetic) zero substrate and the lighter metal substrate is the non-ferrous (non-
magnetic) zero substrate. The meter automatically senses ferrous and non-ferrous substrates.
1. Place a reference film (250µm, for example) on the round, ferrous substrate.
2. Power the meter by pressing the power button if necessary.
3. Place the spring-loaded meter sensor against the reference film.
4. The meter will emit an audible tone indicating that the measurement has been taken.
5. The LCD will show the reading (250µm) at the center of the display area.
6. A typical display will also show the following:
• Group(x): Upper left; Reading Memory Group
number (0~50). Use the up/down arrow buttons to
scroll groups
• (x): Upper right; Number of readings (0~50) stored in
current group
• Battery status icon at upper right
• DEL: Press the RIGHT arrow button to delete the displayed reading
• Fe or NFE: Ferrous or Non Ferrous substrate on the lower left of the LCD
• Bluetooth icon: When Bluetooth operation is active
• Automatic Metal detect mode (dual arrows)
Experiment with the remaining reference films and the substrates before using the meter
professionally.

Automatic Power OFF

In order to conserve battery life, the meter will automatically turn off after approximately 3
minutes. To defeat this feature use the programming menu detailed in the next section (menu
parameter AUTO POWER OFF under SET).
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