Salter Brecknell LPS30 - Manual (Page 7)

scale’s zero-point. Move away any weight on the scale. Press TARE button
to confirm, or press ON/OFF/ZERO to exit this mode.
6. When ‘CAL.P1’ is displayed, the scale will be calibrated on second
calibration point. The default standard weight is 50%FS, and at the same, you
can press ON/OFF/ZERO to exit the calibration mode. Or load
12.5%-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 25%-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 25%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;
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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 try to
repeat from step5. The scale will return to normal weighing mode.
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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 (N FS ) 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 W
FS is (N FS )= (Nw)x (W FS )/W .
Negative value may be displayed because of error connect of loadcell or error
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