Salter Brecknell 630 - Manual (Page 18)

xviii
CHAPTER 6: CALIBRATION
6.1 CALIBRATION OVERVIEW
Your 630 scale ships from the factory fully calibrated. There is no need to calibrate the scale unless
you feel that it has become inaccurate. It is a good idea to check the calibration of your scale from
time to time with a precision test weight. Transcell recommends that you perform a new calibration
on your digital scale at least once a year.
During calibration, at least two values are saved in the scale’s memory – the zero value
(deadweight) and the up to three span values (test weights). See Table 6-1 for a listing of
minimum and recommend test weights.
6.2 CALIBRATION MODE
1. Toggle the ON/OFF switch to the OFF (0) position.
2. Press and hold the ZERO key while powering back on the scale. When the scale shows
” o Zone” you are in Calibration mode and you may release the ZERO key.
3. Press the ENT key. The scale shows “C 0” on the middle screen and displays a value on the
right hand screen. The “C 0” indicates that the scale is prompting for the zero calibration value.
The value to the right is for troubleshooting purposes only. Allow a 20-minute warm-up period
for the load cell and electronic components to become thermally stable.
4. Remove all items from the scale’s platter. Press ZERO to zero the value.
5. Press the ENT key to save the zero point value.
The scale shows "0.000" on the left screen,
“C 1” on the middle screen and a value on the right screen. The “C 1” indicates that the scale
is prompting for the first span calibration value. The value to the right is for troubleshooting
purposes only.
6. Use the numeric keys to enter the test weight value. Please note that the decimal point is fixed
so that if you are entering, for example, 6 lb, you need to type “6” followed by zeroes until the “6”
is to the left of the decimal point.
7. Place the test weight(s) onto the scale’s platter, then press the ENT key. If the calibration was
successful, the display will show "END C1" momentarily, then prompt for the next span
calibration value.
8. If you wish to use up to two more calibration test weights, repeat Step 7 twice. Each subsequent
test weight must be greater than the last. If you do not wish to use more calibration test weights,
simply press ENT twice. The scale then automatically enters Normal Operating Mode by
performing a countdown test. Remove the test weight from the platter
NOTE: If you encounter a failure, consult Appendix C for possible causes and remedies.