Operation; Meter Power And Auto Power Off; Measurements, Zero Function, And Alarms - Extech Instruments CG104 User Manual

Operation

Meter Power and Auto Power OFF

The meter powers up automatically when the sensor is pressed against a measurement surface.
If the display does not switch ON, install or replace the batteries. The Auto Power OFF (APO)
feature switches the device OFF after 30 seconds of inactivity. Note that the APO feature is
deactivated while programming in the 'Options' menu.

Measurements, ZERO function, and Alarms

Practice with the supplied film and zero reference metal substrates to learn how the meter
operates before moving on to a professional application. The heavier metal substrate is the
ferrous (magnetic) substrate and the lighter metal substrate is the non-ferrous (non-magnetic)
substrate (they are labeled).
When in the AUTO MODE (see 'Options' menu) the meter automatically senses ferrous and non-
ferrous substrates (the display icons inform the user) otherwise the user must select ferrous or
non-ferrous in the 'Options' menu.
1. Set the meter to ferrous, non-ferrous, or automatic sensing mode in the 'Options' menu.
2. Make sure that the tip of the meter is clean of all oil and particles.
3. Press the spring-loaded sensor against the surface of a blank round ferrous or non-
ferrous substrate.
4. While maintaining contact with the substrate, momentarily press the ZERO/CLEAR
button. The meter will beep once and '0' will appear on the display indicating that the
meter has been zeroed.
5. Place a reference film on either the ferrous or non-ferrous substrate.
6. Take a measurement by pressing the spring-loaded sensor against the reference film.
7. The meter will beep once when the measurement is taken. Note the reading on the
display. If it is out of specification perform a calibration.
8. If the coating thickness measurement is above the range of the meter, the meter will
display "---" and emit a series of beeps.
9. If the measured value exceeds the High or Low Alarm limit the meter will emit a series of
beeps and the high alarm (up arrow) or low alarm (down arrow) icon will appear on the
top of the display. Program the High/Low Alarms in the 'Options' menu.
CAUTION
Keep the meter clear of Electromagnetic radiation sources as explained in the Safety section of
this User Guide.
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