Zero Calibration; Calibration Introduction; Preparing For Zero Calibration - Extech Instruments CG304 User Manual

ZERO Calibration

Calibration Introduction

The meter is factory calibrated before shipment to the customer; however the customer should
perform a Zero Calibration before any critical measurements are taken.

Preparing for ZERO Calibration

1. Clean the probe tip (grease, oil, metal scrap, and the slightest impurity will affect
measurement and will distort readings).
2. Switch the meter ON at a 10 cm (4") minimum distance from any metal.
3. Ready the supplied metal substrate.
4. The meter is now ready for calibration.
Zero Calibration
The user can access the ZERO Calibration utility from the normal measurement mode or from
the Programming Menu.
ZERO Calibration from the normal measurement mode
Press and hold the UP arrow button to access the NFE (non-ferrous) Zero Calibration
1.
screen
Press and hold the DOWN arrow button to access the FE (ferrous) Calibration screen.
2.
At the desired calibration screen press the sensor against the FE or NFE zero reference
3.
substrate.
Press the LEFT button (OK) to accept the calibration value or press the RIGHT button
4.
(CANCEL) to abort the calibration.
ZERO Calibration screens from the Programming Mode
From the normal measurement mode, press the LEFT button to access the menu.
1.
Use the DOWN button to scroll to the CALIBRATION mode.
2.
Press LEFT (SELECT) to open the CALIBRATION parameter.
3.
Scroll to 'CAL ZERO OF FE' or 'CAL ZERO OF NFE'
4.
Press the LEFT button (SELECT) and 'CAL FE' or 'CAL NFE' should be displayed on the
5.
LCD's lower right.
Press the sensor against the FE or NFE zero reference substrate.
6.
Press the LEFT button (OK) to accept the calibration value or press the RIGHT button
7.
(CANCEL) to abort the calibration.
Note that the user can delete ZERO Calibration data by selecting 'Del ZERO of FE' or 'Del
8.
ZERO of NFE' from the CALIBRATION mode in the Programming menu.
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