Ultra-Thin Material; Rust, Corrosion, And Pits; Error In Identifying Material; Degradation Of Probe - Reed R7900 Manuel D'utilisation

Ultra-thin Material

An error will occur when the thickness of an object is less than the low
limit of the probe. When necessary measure the minimum limit thickness
by comparing it with test pieces. When measuring an ultra-thin object,
sometimes errors called "double refraction" may occur. This results in a
displayed readout that is twice the actual thickness. Another error result
is called "pulse envelop, cyclic leap". This results in the measured value
being larger than the actual thickness. To prevent these kinds of errors
repeat the measurement to confirm the results.

Rust, Corrosion, and Pits

Rust and pits on the surface of the object will cause irregular change in
readouts. In extreme situations it will even cause no readout. To avoid
errors, orient the probe's crosstalk interlayer plate in different directions to
take multiple measurements.

Error in Identifying Material

If you calibrate the meter with one material and then measure another
material, an error will occur. Be careful in selecting correct sound velocity.

Degradation of Probe

The surface of the probe is allyl resin. After a long time of use its
roughness will increase resulting in reduced sensitivity. If determined that
this is the reason for errors, grind the surface with sandpaper or oilstone
to make it smooth and to give it good parallelism. If it is still not stable, the
probe must be replaced.

Overlapped Material and Compound Material

It is impossible to measure uncoupled overlapped material because the
ultrasonic wave can't pass an uncoupled space. Since the ultrasonic wave
534 Blue
123 Yellow
can't transmit in a compound material in even speed you cannot use an
485 Red
ultrasonic thickness-gauge to measure overlapped material and
123 Yellow
compound material.
534 Blue
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