Specifications

14 QB Series Operation Manual
3.0 Span Calibration
To achieve optimum accuracy from your QB Series balance, it should be calibrated on a regular basis in the
environment in which it is normally used. If the device is moved to another physical environment, recalibrate the
device before using it. A few extra moments invested with this section will ensure virtually error-free
performance of the device.
After properly performing the installation guidelines (see Section 1.3 on page 2 and Section 1.4 on page 3),
follow these calibration steps.
1. Power up the balance (Section 1.7 on page 5).
2. Have ASTM Class 4 test weights available equal to 100% of the nominal capacity (in grams) of the
device. (Weights and weight sets are available from Rice Lake Weighing Systems.)
3. Ensure that there is no load on the platform.
4. Ensure that the device is level and on a stable surface, free from environmental changes. Pay special
attention to possible and sudden changes in humidity, temperature and moving air.
5. Ensure that the balance displays a
0 or 0.00 value. If not, press and release the T key once.
6. If the device is currently using any unit of measure other than grams, activate the grams unit of measure
(Section 2.2 on page 6).
7. If the device is currently in the counting mode, reactivate the conventional weighing mode (see
Section 2.9.5 on page 13).
8. Press and hold the
F key until the word CAL appears. As you press and hold the F key for approximately
two seconds, the word
FUNC appears. The word CAL appears after two additional seconds.
9. When the word
CAL appears, release the F key. If you hold the F key down too long, the unit returns to
the default weighing mode. If this occurs, start over at step 8.
10. While pressing and holding the
T key, press and hold the F key. Release both keys at the same time. The
display shows
unit 1 where 1 represents the function code for the grams unit of measure as active.
11. Press and release the
F key.
12. The device momentarily displays a flashing
on 0, indicating an automatic calibration of true mechanical
zero.
13. After zero calibration, the device automatically advances to read
on F.S.
14. Place a load equal to the nominal capacity of the device on the center of the platform.
15. The
on FS display flashes, indicating that the device is electronically calibrating a full scale load
equivalent to the nominal capacity of the device.
16. When calibration is complete, the device automatically displays the calibrated nominal capacity of the
balance.
17. Remove the test load from the balance.
18. The device automatically returns to a
0.0 value and the default weighing mode.
In some rare cases, automatic calibration may not be possible. In the event of an error message during
calibration, please refer to the table below for the appropriate corrective action.
Error Message Problem Solution
O-ERR • Calibration load is in excess of the nominal capacity of the
device. The device is out of calibration and is sensing a
100% load being greater than the nominal capacity of the
device.
• The calibration test load is > 100% of the nominal
capacity.
• Change the test load so that it is
equal to 1/2 or 3/4 the nominal
capacity of the device. Then run a
second calibration at 100% nominal
capacity.
• Reduce the test load so that it is
equal to 100% of the nominal
capacity of the device.
1-ERR Calibration load is less than 1/2 of the nominal capacity of the
device.
Increase the test load so that it is equal to
the nominal capacity of the device.
2-ERR Data error is in excess of 1% of the rated capacity. Contact your RLWS dealer.
Table 3-1. Possible Calibration Process Error Messages