Flintec FAD-40 - Manual (Page 17)

FAD-40 Technical Manual, Rev. 1.06 December 2012 Page 17 of 52
Select the scale operation mode and the polarity. Then click the “Write to A/D Converter” button to save your
mode selection. The default calibration of FAD-40 instruments is Count Mode and 10 mV unipolar input signal
range. If you select the Count Mode, there is no scale build and instrument calibration. Each FAD-40 instrument
is adjusted for high accuracy during the production. The FAD-40 input signal ranges and their external
resolutions are shown in Table 5.1.
Input signal range Input Signal level Polarity External resolution
0 to 5 mV 5 mV Unipolar 1 million counts
-5 to 5 mV Bipolar 2 million counts
0 to 10 mV 10 mV Unipolar 1 million counts
-10 to 10 mV Bipolar 2 million counts
0 to 15 mV 15 mV Unipolar 1 million counts
-15 to 15 mV Bipolar 2 million counts
0 to 18 mV 18 mV Unipolar 1 million counts
-18 to 18 mV Bipolar 2 million counts
Table 5.1 - Count Mode, Input Signal Ranges and External Resolution
Select the input signal level and polarity for high external resolution. Write your mode selection to the
instrument by clicking “Write to A/D Converter” button. Jump to the chapter 5.4.
Scale Build
The scale capacity, the increment and the unit have to be introduced to the FAD-40 instrument before you can
perform a calibration in Weighing or Force mode.
Capacity: To select a new value for the scale capacity, click in the text box.
Use the keyboard to enter a new value, or use the drop-down menu.
Increment: Use the drop-down menu to select the increment.
Unit: Select the unit
The scale calibration can be performed by using test weights or by electronic calibration (eCal).
Calibration by Test Weights
This calibration method performs zero and span calibrations using test weights. For accurate calibration the test
weight value should not be less than 1/10 of the scale capacity.
Figure 5.5 – Calibration by test weights
Please note that the scale build values should be entered before you start the calibration.
Select “Full Calibration” for performing a complete scale calibration. Click the “Start” button. Unload the scale
for performing the zero calibration and click the “Yes” button. The virtual display will show the [WAIT] message
during the zero calibration. During the zero calibration the scale must be stable. Approximately 5 seconds later
the span calibration window will be displayed. Load the scale and enter the loaded test weight value, then click
the “OK” button. The scale must be stable during the span calibration. Approximately 5 seconds later the new
calibration settings are saved automatically.
If any error occurs during the calibration an error message warns you. Click the “Yes” button to reload the
previous values or click the “No” button to use the new settings.
You can adjust the zero or the span of your scale without performing a full calibration. Additionally the “span
calibration to the unloaded scale” feature is another tool of FAD-40 instruments for after-sale services.
Zero Adjustment
If your scale has a residual zero drift you may perform a zero adjustment only. Select “Zero Adjustment” and
press the “Start” button. Then the zero calibration window will be displayed. Unload the scale and click the “OK”
button. The [WAIT] message appears on the virtual display during the zero adjustment. Approximately 5
seconds later the zero adjustment will be finalized.
Note: Zero adjustment is also performed over the bus interface. Refer to the data structure of the related bus
interface.