Salter Brecknell HS-300 - Manual (Page 7)

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can press ON/OFF/ZERO to exit the calibration mode. Or load 5%-100%FS
weight, and use PRINT/HOLD and UNIT keys to input the loaded weight.
If the input data is larger than 199999, it will show as “Hxxx” and “Lxxx”. If
the triangular symbol on the left bottom of LCD window appears, it means
that the digit being changed is the displayed most significant bit which can
only be 0/blank or 1. Press TARE key to confirm your setting and the
indicator will flash the input standard weight. Wait till the scale comes steady,
and input A/D data as per the standard weight.
The indicator will automatically go to next step, if the second point can be
calibrated correctly. If there’s an error occurred, the scale will display “CAL.
Er” and return back to step 5 for re-calibration.
7. When ‘CAL.P2’ is displayed, the scale will be calibrated on third calibration
point. When xxxxxx kg (or lb) is displayed (100% FS is default), you can
press ON/OFF/ZERO to exit the calibration mode or Place a standard
weight (must be in the range of 10%-100% FS, and equal or larger than that
for the second calibration point; this is also the range of your input number)
on the scale. Use PRINT/HOLD and UNIT key to input the standard
weight’s value. Use TARE key to confirm the standard weight and input
number are correct. If the calibration weight for third point is same with that
for second point and the calibration weight is more than 10%FS, input the
standard calibration weight same as second point calibration and press TARE
key to confirm the setting. The indicator will flash the input weight. If the
indicator get reasonable data (the input weight is correct, and the calibration
weight of third calibration is more than equal to the calibration weight of
second calibration), it will go to next step automatically. If there’s an error
occurred, the scale will display “CAL.Er” and return back to step 5 for
re-calibration.
8. When ‘CAL.P0’ is shown again, that means the scale will calibrate scale’s
zero-point again. Now, you can press ON/OFF/ZERO to exit the calibration
mode; or Move away any weight on the scale, press TARE key to confirm;
the displayed data will blink. If the indicator gets reasonable data, it will
calculate and store all parameters in EEPROM. And then it will auto-reset
and display all segments of LCD, full capacity… like power on again. If
there’s an error occurred in calibration, the scale will display “CAL.Er” and
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try to repeat from step 5. The scale will return to normal weighing mode.
Attention: To ensure the accuracy of the scale, it is recommended to use over
75% full capacity weight to calibrate.
Ⅳ. DISPLAY ADC CODE OR INPUT WORKING VOLTAGE VALUE
1. In normal weighing mode, press and hold down ON/OFF/ZERO and
HOLD/PRINT key more than 3s, until ‘codE’ is shown, this means you have
been in display inner code mode; but first, the indicator will show the firmware
version “xx.xx.xx”. 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 A/D code for FS weight must be larger or equal to 2 times
of selected display division-n; otherwise, the calibration cannot be properly
completed. Eg. 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 needs 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 (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.
ADC increase for full capacity (NFS) can be making out 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, if 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.