UEi Test Instruments DRS220 User Manual

Page 8

DRS220 User’s Guide

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

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

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,

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.