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b. BCD Output
Take the following steps (Refer to Figure 6-5, next page):
1. Before changing any DIP switch positions, record the factory-set positions for reference.
2. Move the magnet to the desired null position. Clamp it in place to prevent movement.
3. Reset all switch segments to the LO (closed) position, taking note of alignment marks on the
board.
4. If a CRT or other readout device indicates a decimal value (in inches, mm, or other units) con-
vert this value from decimal to BCD binary, and record it in row B of the diagram in Figure 6-5
(next page).
Alternatively, read each active bit on the counter card output and record this BCD number in
row A of the Diagram. Then convert row A to decimal, and record it in row B.
5. Subtract each digit in row B from 9, and record the result in row C.
6. Convert row C into BCD binary and record the result in row D.
7. Use the number from row C to mark the columns E and F. If the corresponding bit from C is 1,
mark an X in column F (open or HI). If the corresponding bit is 0, mark an X in column E
(closed or LO).
8. Turn off power, then set each switch segment to the value (HI or LO) indicated by the Xs in
columns E and F.
9. Apply power to the system and check that the output is now zero.
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