DRS220 User’s Guide
12
Calibration
The DRS220 is calibrated at the factory to provide high accuracy. While
recalibration should seldom, if ever, be necessary, recalibration is performed easily
without sending the product to the manufacturer for service. A known calibration
weight (in kilograms) is required to recalibrate the scale, and can be any value
between 5 kg and 100 kg. 25 kg is recommend. Best accuracy is obtained by using
the largest weight available (i.e. a 50 kg calibration weight will provide better
calibration accuracy than a 5 kg calibration weight). In addition, it is necessary to
know the weight to within 2 grams.
To recalibrate the DRS220, perform the following steps:
1. Place the DRS220 weighing platform on a firm, level surface.
2. Turn the power to the DRS220 off.
3. Remove all objects from the platform.
4. While holding
, press and release
. The DRS220 will turn on, and after a
few seconds the display will show
SET CAL
and
25.000 kg
.
5. Using
or
adjust the displayed value (in 2g increments) so that it is equal
to the weight of the reference calibration weight. Use the
key to adjust in 1
kg increments.
6. Press
. A number representing the weight of the unloaded platform will
appear on the display. Press
to lock in this value. The display will read zero.
7. Apply the calibration weight to the platform. A number representing the applied
reference weight will appear on the display. Allow at least 10 seconds for this
number to stabilize.
8. Press
. The DRS220 is now recalibrated to the reference weight.
9. Refer to the Quick Start section above for setting the desired Units and
Resolution.
DRS220 User’s Guide
13
Restoring Factory Calibration
If you make a mistake recalibrating the DRS220, you can always restore the factory
calibration (and factory defaults) of the scale.
To restore the factory settings perform the following steps:
1. Turn the power to the DRS220 off.
2. Remove any objects from the platform.
3. While holding
, press and release
. The DRS220 will turn on and 10
beeps will sound. The factory settings are now restored.
4. Refer to the Quick Start section above for setting the desired Units and
Resolution.
NOTE:
When calibrating or restoring the factory calibration,
or
must be held
while pressing and releasing
. Otherwise, the calibration or calibration restore
functions will not operate.
Sound
As delivered from the factory, the DRS220 beeps when turning on and when keys
are pressed. This sound can be muted as follows:
1. Make sure the power is on.
2. While holding
, press
. The musical symbol on the left of the display
will turn off to indicate that the sound has been muted.
Repeat steps 1 and 2 to turn the sound back on.
NOTE:
The Mute function only affects the power-on and key-press beeps. It has no
effect on the alarm.
