A digital panel meter displays readings in decimal form. What is a key advantage of using BCD coding instead of pure binary?
It avoids complex binary-to-decimal conversion logic for display circuits.
In BCD (Binary Coded Decimal), each decimal digit 0–9 is coded separately as a 4-bit group, e.g. 59 → 0101 1001.
Each 4-bit group can drive a BCD-to-7-segment decoder (like 7447) directly, so the display needs no complex binary-to-decimal conversion circuitry.
BCD has no built-in error correction; it is less memory-efficient than pure binary (6 of the 16 codes per nibble are unused); and it needs 4 lines per digit, which does not reduce wiring.
Hence, the answer is It avoids complex binary-to-decimal conversion logic for display circuits.
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