ALTANA Byko-Test 8500 - Manual (Page 6)

7.1.1.4 Selection of User-Specific Calibration
On this menu level all specific calibrations are listet below the option "New Calibration". To
scroll through the list use the keys
! and ". By pressing key # the corresponding menu is
opened. The activated calibration is marked by a dot right to the name.
7.1.1.4.1 Activation of User-Specific Calibration
The selected calibration is activated by pressing #.
A warning is displayed, when this calibration has not yet been performed. In this case the
menu moves on to the list from which one of the two calibration procedures can be selected
(see following §§).
7.1.1.4.2 Calibration
Prior to performing a calibration it is recommended to set the zero reference on the
corresponding uncoated substrate.
Two types of calibration are available:
7.1.1.4.2.1 One-Point-Calibration
With a one-point calibration the accuracy of the probe can be optimized in the vicinity of an
expected coating thickness.
To do so a test shim with a thickness of about the same as the expected coating thickness
is placed on the uncoated substrate. Then the probe is placed on the shim. The displayed
reading can be adjusted up or down to the thickness of the shim by pressing
! or ".
The adjustment of the calibration is confirmed and activated by pressing key #. The gauge
returns to the normal measuring mode.
7.1.1.4.2.2 Two-Point-Calibration
A two-point calibration is used to optimize the probe for a certain range of coating thickness.
As a first step place a test shim with a thickness close to the lower limit of the coating
thickness range on the uncoated substrate. Then place the probe on the shim. Adjust the
reading to the thickness of the shim using the keys
! and " until the reading shows the
thickness of the shim. The adjustment is terminated by pressing the key #.
In a second step place a test shim with a thickness close to the upper limit of the coating
thickness range on the uncoated substrate. Then place the probe on the shim. Adjust the
reading to the thickness of the shim using the keys
! and " until the reading shows the
thickness of the shim. The adjustment is terminated by pressing the key #, and the
calibration is activated.
After the second step the gauge returns to the normal measuring mode.
7.1.1.4.3 Rename User-Specific Calibration
Modification of the name of a calibration is done as described in § 7.1.1.2.
After changing the name the gauge automatically moves back to menu item of § 7.1.1.4.
7.1.1.4.4 Delete User-Specific Calibration
After pressing key # the display shows "OK" and "Cancel" respectively. When confirming
"OK" the user-specific calibration is deleted.
7.1.2 Average Zero Reference on Rough Surfaces (BMR)
On rough substrate surfaces the zero readings will vary from one spot to the next. This
variation increases with increasing roughness.
This option allows the user to find an average zero reference. Select a number of zero
readings that need to be taken before the gauge calculates the average zero (Base Metal
Reading = BMR). This values is stored and used to determine the coating thickness on the
corresponding coated substrate.
When pressing the key
# in the menu "Average Zero" the options "OFF" and "Value" show
up.
The option "OFF" resets the gauge to a single zero reading.
When selecting the option "Value" the number of zero readings for the BMR calculation can
be set using the keys
! and ". The number is confirmed by pressing key #.
7.2 Measuring Mode Settings
7.2.1 Selection of Substrate
In addition to the normal Fe- and NFe-mode the gauge provides a combination mode. In this
mode both measurements, Fe and NFe, are taken at the same time.
This combined measurement can be helpful when a metal coating (e.g. zinc, chromium) on
a ferrous substrate is coated e.g. by lacquer.
Important: The non-ferrous metal coating must have a minimum thickness of 50
$m (2 mil).
7.2.2 Single Measurement / Continuous Measurement
Beside the single mode the gauge can also be set to a continuous mode. In the continuous
mode the gauge performs repeated measurements in short intervals as long the probe is
placed on the surface.
The continuous mode is indicated by the symbol
.
7.2.3 Upper Limit
7.2.3.1 Setting of Upper Limit
After pressing key # the last reading is displayed, if no limit was set before. Otherwise the
current value is displayed.
The upper limit is set by pressing
! or " and confirmed with #.
A reading exceeding the upper limit is indicated by the symbol ! and an acoustical signal.
7.2.3.2 Delete Upper Limit
After pressing key # the options "OK" and "CANCEL" appear on the display. With the
confirmation of the selection "OK" the upper limit is deleted. When selecting "CANCEL" the
limit remains unchanged.
7.2.4 Lower Limit
Selection and deleting of the lower limit is performed in the same way as described in §
7.2.3.
A reading smaller than the lower limit is indicated by the symbol
" and an acoustical signal.
7.2.5 Averaging of Readings
With large variations in coating thickness or to meet the requirements of a test standard the
gauge can be programmed to calculate and display / store an average coating thickness
from a predefined number of measurements.
To activate the averaging the number of measurements must be set in the next menu level
by pressing
!or ". The selected number must be confirmed with #.
This mode is indicated by the sign x.
When measuring in the averaging mode the actual reading is displayed together with a
counter for the remaining readings until the average is displayed at normal size.
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