Preamble
UM-30300D-U User manual AX 6000 Page 3 / 54
Preamble
MEASUREMENT PRINCIPLE
1. DEFINITION
The AX 6000 instrument is a milliohmmeter designed to test metallization encountered
in aviation. This quality test controls the mechanical assembly of each part who
constituting a plane.
For this, he characterized the control of the junction between two or more parts using
the principle of measuring electrical continuity.
Each branch is then represented by an ohmic resistance which must be as low as
possible.
2. PRINCIPE
The measurement principle is to circulate a calibrated continued current 0.1A, 1A or
10A between any two points A and B materializing the resistance to measure R
X
. Then
it proceed to read the potential between these two points, the measured voltage at
terminals of the resistance is proportional to the current passing through, according to
the ohm's law:
U = RI
To realize these measurements the instrument uses:
9 A constant current generator supplied with a 12 V Lithium Polymer battery.
9 Two probes with doubles contacts for the "4 wires" measurement:
• A contact (point) to establish the current in the resistance to measure.
• Another contact (point) to measure the potential difference through an
instrumentation amplifier.
9 A voltmeter allows reading the voltage kept at the amplifier output.
Note: the three measurement currents are: 10 A for the metallic and aluminium parts,
1 A and 0.1 A for the composites materials parts.
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