Operating instructions

104
Configuring the Analog/
Digital Converter
Purpose
Configure the analog/digital converter
by selecting the required parameters
in the Setup menu to adapt Combics
for use with all commercially available
strain-gauge load cells and analog
Sartorius CAPP, CAPS, IWA, IU, IF
platforms. Access to settings for A/D
converter configuration is password-
protected (Service-code).
Features
With the menu access switch open, you
can configure most of the following
parameters:
– Toggling between weighing mode
“standard" or “trade" (scale verified for
use in trade/legal metrology)
– Verification scale interval e
– Scale interval d
– Minimum capacity
– Maximum capacity
– Maximum capacity for each weighing
range
– Verification scale interval e for each
weighing range
– Accessibility weight units
These parameters are not reset when
you restore the factory settings.
Depending on the weighing mode
selected, the configuration options for
parameters not listed above are the same
as they are in a corresponding Sartorius
weighing instrument that cannot be
switched between “standard" or “trade"
modes.
Note on Settings
Configure the A/D converter in the
numeric menu (weighing platform 1:
Level 1, weighing platform 2: Level 2 by
selecting menu item 11-x). Please refer
to the illustration on the next page. For
accessing the numeric menu, also refer
to the chapter entitled “Configuring
the Combics."
The A/D converter can be configured
only in the Service mode.
Make sure you close the menu access
switch after configuring the A/D con-
verter; otherwise, “H” (too heavy) and
“L” (too light) cannot be displayed.
Configure the maximum capacity for
each weighing range in a suitable
weight unit, without in decimal places.
Select the desired weight unit under the
11-7 “Lock units" menu item. For pur-
poses of display in the metrology line,
the maximum capacity for all ranges
must be configured so that they can be
displayed with a maximum of four dig-
its other than “0" for all accessible
units.
The same applies to releasing and
locking weight units 1 and 2. The
weight unit selected for configuration
cannot be excluded.
Testing and Configuration for Use
in Legal Metrology
A metrology label is included in the
equipment supplied with the Combics.
After the A/D converter has been suc-
cessfully configured, the metrological
data for all of the ranges on the label
can be keyed in. Attach the label below
the display window and seal with the
water-tight acetate overlay.
You additionally need to attach the
label “The counting and neutral meas-
urement feature is not legal for trade”
below the display window on Combics 2
indicators..
Under menu item 1-7, you can check to
make sure that only permissible weight
units are accessible.
Description of the Individual
Menu Items
Menu item 9-1-3 / 9-1-4:
Select and load the configuration data
Before starting the actual A/D converter
configuration, you must define whether
the weighing platform is to be used in
the “standard" mode or in the “trade"
mode (scale verified for use in trade/
legal metrology):
– Standard configuration
(Menu item 9-1-3)
or
– Trade configuration (Menu item 9-1-4)
Menu item 11-1 (Class)
When using the “Standard configura-
tion", this menu item is turned off.
When using the “Trade configuration,"
(for weighing platforms scale verified
for use in trade/legal metrology)
only menu item 11-1-4 is displayed.
Accuracy class l is already selected;
when you press ) to select menu
item 11-4-4, a circle (“
o ”) is shown
indicated that this setting is active.
Range Selection (menu item 11-3)
The weighing range of the weighing
platform can be divided into one or
multiple ranges as desired. This is
established by selecting the menu
item 11-3:
– Single range (11-3-1)
The entire weighing range is divided
into scale intervals which are dependent
on the lowest scale interval d and the
maximum capacity. The readability for
the entire weighing range is always the
lowest scale interval d.
– Multiple range scale (11-3-2)
Scales with two or three weighing
ranges. If the lower weighing range
is exceeded, the scale switches to
the higher weighing range (lower
resolution) and remains there. You
can only switch back to the lower
weighing range (higher resolution),
when the scale is completely unloaded
after pressing the ( key.
– Multi-interval scale (11-3-3)
The “multi-interval scale" function
divides the weighing range into as many
as 4 ranges with different readability.
For the Trade configuration, only in
the accuracy classes l permitted.
The readability automatically adjusts
each time the weight on the load
receptor exceeds a defined range limit.
When a weight causes the weighing
instrument to change from a higher to
a lower range, the higher resolution
is automatically selected. After taring,
the highest possible resolution of the
first range is restored, even when the
weighing platform is loaded.