Doran 2200 Series, Instruction Manual

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33
A/D Range Troubleshooting
On scales with factory installed platforms, the zero and span will lie within permissible
limits. The allowable load cell signal input range is from 0.112 mV/V to 7 mV/V.
1) Enter the calibration mode.
2) Press PRINT until the A/D raw counts are displayed.
3) Remove all items from the platform and record the dead load raw counts
reading.
4) The dead load raw counts must be between -50,000 and 1,900,000 counts. If
the readings are outside of the limits specified, change the dead load until you
meet these requirements.
5) Place full capacity on the platform and record the raw counts. Subtract the
dead load counts from the full load counts to calculate the span. Refer to Table
1 and verify that the span falls within the specified range. The "Full Load" raw
counts (span + dead load) should not exceed 1,999,999 counts.
6) When using 75%, 50%, 25%, 20% or 10% of full load to calibrate, refer to Table
1 for full load, 75%, 50%, 25%, 20%, 10% span ranges.
Platform load Minimum span
Full 30,000
75% 22,500
50% 15,000
25% 7,500
20% 6,000
10% 3,000
Table 1: Calibration requirements in raw counts