Evaluation And Interpretation Of The Results - Goldanalytix GoldScreenBox Instruction Manual

8. Evaluation and Interpretation of the Results

The following chapter gives you hints for the interpretation of the established conductivity in the
"precious metal measure mode".
In order to test the most common bullion precious metals for their correct conductivity in the core
(up to the corresponding penetration depth!), you can use this mode for the corresponding set
values and a graphical interpretation through a "traffic-light" bar.
The value next to "DES" shows the reference conductivity (current conductivity) of the desired
metal or alloy at 20 °C in Megasiemens per metre [MS/m]. Ideally, the established value ("VAL") is
identical. However, small deviations can occur in case of bullion precious metals and are
completely normal. This can have the following reasons:
 Scratches
 Blisters & bars / other packages
 Temperature effects (temperature of the device differs from the one of the measured
object, etc)
 Striking on coins or bars
 Bends and deformations
 Uncommon coins or impurities with ferromagnetic material
This is why there is a green tolerance range around the set value for genuine precious metals. If
the value is inside the green one, you can feel confident: the conductivity of this metal is near the
set value of the desired material. PLEASE NOTE: This step is not a guarantee that your object is not
a fake. The GoldScreenBox is a penetrating eddy current measuring device and no independent
fake detector, because it is possible to develop and produce an alloy with e.g. the same electric
conductivity as gold (e.g. copper with low silver content), but in this case, the dimensions and
weight of the coins or bars won't be correct. We recommend the usage of various measuring
methods to detect falsifications.
In case of coins, we recommend the following procedure:
Step 1: Establish the weight with a precision balance – does it correspond with the set value? In
many cases, fakes are already detected here.
Step 2: Compare the dimensions (thickness and diameter) with the set values of the desired coins
with an electronic slide gauge (can be purchased at specialist shops) or stencils.
If 1 and 2 correspond exactly with the set values (easy to find on the Internet), it can only be a fake
with material of the same density – in case of gold, these are for example metals like tungsten or
be used in order to identify unknown metal
objects.
Push the button to get back to the menu.
9