Brecknell MS140/300 Mode D'emploi page 29

In this mode, the proper ADC data at zero point can be viewed by examining the A/D
data for loaded weight.
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MS140/300 User Instructions
If the ADC increase for full capacity is NFS, the power-on zero range is
m
set to Zp% FS (P12 setting) and zero key range is set to Zk% FS (P13
setting). Then proper ADC data of zero point is larger than (Zp%+ Zk%)
x NFS.
From the weigh mode press and hold the [ON/OFF/ZERO] and [HOLD/PRINT]
key until Code is shown. The indicator will show the firmware version.
ADC increase for full capacity (NFS) can be make by loading 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.
It is possible a negative value will be displayed due to an error from the
loadcell(s) or the position of the zero-point potentiometer on PCB. However,
the software only deals with positive values. In this case the position of zero-
point potentiometer will need to be adjusted to make the ADC data will be
positive value and larger than (Zp%+ Zk%) x NFS. Normally the indicator is
factory-calibrated and adjustment is not necessary. Refer to
zero point potentiometer location. Decrease ADC data by rotating clockwise,
and increase ADC data by rotating counter-clockwise.
Figure 5.1 Zero Point Potentiometer Location
Press the [UNIT] key to select the ADC weight inner code or input the inner
working voltage value. When Ux.xx is displayed, the displayed digits are the
voltage value. The proper working power voltage is between 5V - 8V.
Press the [TARE] key to display filtered or unfiltered weigh A/D data. When
is on the data is filtered.
Press the [ON/OFF/ZERO] key to exit this mode and return to the normal
weighing mode.
Figure 5.1 for the
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