.
7
5.
View ADC Code or Power Voltage
1.
In normal weighing mode, press and hold UNIT/HOLD , TARE and ZERO/ON/OFF keys until “
code
” is shown,
which means the indicator is working under display inner code mode. In this mode, you can examine the inner
working voltage, the stability of weighing system, the variety value of A/D data as per the loaded weight.
NOTE:
1)
The increment of ADC code for FS weight must be larger or equal to 2 times of selected display division;
otherwise, the calibration cannot be properly completed. E.g. the display division is 0.1kg. Load 100kg
standard weight on the platform, the increment of A/D code is at least 2x 100kg/0.1kg= 2x1000=2000. In
this case, the scale can be calibrated. Otherwise, smaller division need to be chosen.
2)
The data should be stable; otherwise, the calibration cannot properly complete.
2.
In this mode, you can calculate the proper ADC data at zero point by examining the A/D data for loaded weight. If
the ADC increase for full capacity is NFS, the power-on zero range is set to Zp% FS and zero key range is set to
Zk% FS. Then the proper ADC data of zero point is larger than (Zp%+ Zk%) x NFS.
3.
ADC increase for full capacity (NFS) can be calculated by: Load the weight W on the platform, and the ADC increase
for W weight is Nw. The ADC increase for full capacity WFS is (NFS)= (Nw)x (WFS)/W .
Negative value may be displayed because of error connect of loadcell or error position of the zero-point
potentiometer on PCB; however, the software only deals with positive value. So, is you are the position of zero-point
potentiometer is error; adjust potentiometer’s position to make the ADC data will be positive value and larger than
(Zp%+ Zk%) x NFS. Normally the indicator is factory-calibrated, and end users do not need this operation.
Below is the drawing of position of the zero-point potentiometer on PCB for conference, decrease ADC data by
rotating clockwise, and increase ADC data by rotating counter-clockwise.
4.
Press the UNIT/HOLD key to select displaying weight inner code or input the inner working voltage value. When
“
U
x.xx” is displayed, the display digit is voltage value, and the unit is V. The proper working power voltage is
between 5V to 8V.
5.
Press the TARE key to display filtered or un-filtered weight A/D data; when
is on, the data is filtered.
6.
Press the ZERO/ON/OFF key to exit this mode and return to normal weighing mode.