Delta MMC120 User Manual download pdf (Page 111)

111

Click here for MDT SCALE Calculation examples

NOTE: When the SCALE parameter is changed, the EXTEND LIMIT, RETRACT

LIMIT,andOFFSET must also be changed.

NOTE:You should never set the SCALE below 16383. If it does go below that value,

then use the Prescale Divisor bits in the CONFIGURATION WORD.Asyou

can see from the ACTUAL POSITION calculation above, this will affect the

scaling, but will reduce round-off errors.

SCALE Calculation Examples

Example 1

For a system using a magnetostrictive transducer with a calibration number of

9.1392 µs per inch, a position unit of 0.001 inch, and 1 recirculation, the SCALE

will be:

scale = 1000(Position Units Per Inch) x 32768= 29878.62

9.1392(µs/in) x 120MHz x 1 (Recirculations)

SCALE = 29879

Example 2

For a system using a magnetostrictive transducer with a calibration number of

9.0110 µs per inch, a position unit of 0.1 millimeter, and 1 recirculation, the

SCALE will be:

scale = 254(Position Units Per Inch) x 32768 = 7697.14

9.0110(µs/in) x 120MHz x 1 (Recirculations)

Since the scale is less than 16383.5, use the Prescale Divisor bits in the

CONFIGURATION WORD to divide the transducer counts by 4. Then multiply

the scale by 4 to obtain:

SCALE = 7697.14x4=30789

Example 3

For a system using a magnetostrictive transducer with a calibration number of

8.9772 µs per inch, a position unit of 0.001 inch, and 8 recirculations, the SCALE

will be:

scale = 1000(Position Units Per Inch) x 32768 = 3802.22

8.9772(µs/in) x 120MHz x 8 (Recirculations)

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Delta MMC120 User Manual Page 111