Fine Span; Keypad Functions - Cardinal CN20 Series Technical Manual

The span can be fine-adjusted, if required, after calibration. Remove the two front screws from the
bottom of the enclosure and loosen the rear two screws. With the indicator on, press and hold the
calibration switch and press the ZERO or HOLD/REL key (Calibration Switch + ZERO = Increase
Calibration Switch + HOLD/REL = Decrease). Turn the indicator off by pressing the OFF key. Tighten
the four cover screws. The indicator is ready for use.
The CN20L weight indicator comes standard with
a membrane keypad containing five (5) keys. The
keypad is shown in detail in Figure no. 7. The
following describes the use of each of these keys:
The membrane keyboard is not to be
operated with pointed objects (pen-
cils, pens, fingernails, etc). Damage
to keyboard from this practice will
NOT be covered under warranty.
ON KEY
Pressing this key when the CN20 is
ON
off will apply power to the instrument.
ZERO KEY
Pressing this key will cause an immediate zeroing of the display up to the selected limit
of either 4% or 100% of the scale capacity. This selection is made during setup and
calibration of the CN20. It is also used to step from one value to the next during setup of
ZERO
the CN20.
lb/kg KEY
Pressing this key will change the weighing units to the alternate units of measurement if
selected during setup of the instrument. With pounds displayed, pressing this key will
lb/kg
change the weighing units to kilograms. Note that this feature must be enabled during
setup and calibration for this key to be operational.
HOLD/REL KEY
This key is used to either lock or unlock the display. If the hold feature was enabled
HOLD
during the setup and calibration procedure, the weight display will lock after placing a
load on the scale platform and obtaining a stable value. The HOLD annunciator will be
REL.
turned on to show that the display is locked. The display will become active again and
the HOLD annunciator will turn off when the HOLD/REL key is pressed. When active,
the weight display may be locked manually by pressing the HOLD/REL key.
OFF KEY
OFF
This key is used to remove power from the CN20, turning it off.
The CN20 series indicators can be equipped with a membrane keypad containing twenty (20) keys
with full numeric keypad. This keypad is shown in detail in Figure No. 8. The following describes the
use of the keys not available on the standard keypad:
GROSS KEY
This key is used to return the weight display to the Gross Weight mode. In this mode, the
G
total of all weight placed on the scale since the display was zeroed is displayed. The
GROSS
GROSS annunciator is turned on to signal the display of gross weight.
TARE KEY
This key is used to enter a tare weight of up to three (3) digits and can operate in one of
two modes depending on the setup of the CN20. If the push button tare feature was
selected during the setup of the instrument, pressing this key will cause the CN20 to
T
enter the current gross weight as the new tare weight value and automatically enter the
TARE
Net Weight mode. The NET annunciator will be turned on to indicate that the CN20 is
now displaying a net weight. If the push button tare feature was not selected, pressing
the TARE key will cause the currently stored tare weight to be displayed and the TARE

FINE SPAN

KEYPAD FUNCTIONS

8
ZERO
ON
ZERO
OFF
MODEL CN20
Figure No. 7
HOLD
lb/kg
REL.
DETECTO
A Division of Cardinal Scale Manufacturing Co.