Scale A, Scale B (Pressure)

Default: 32767 for 16-bit, 4096 for 12-bit
Range: -32768 to 32767

TIP: On the Tools menu, click Scale/Offset Calibration to help calculate Scale and Offset.

These two parameters have slightly different uses when using the axis as a differential force versus when the axis is used for single-ended pressure.

For single-ended pressure, Scale A is used to calculate the Actual Pressure in pressure units from Counts A. Scale B is unused.

For differential force, Scale A is used to calculate Actual Force A in force units from Counts A, and Scale B is used to calculate Actual Force B in force units from Counts B. Actual Force B is then subtracted from Actual Force A to give the Actual Force, which is displayed in the Actual Pressure status field.

Note: When a scale is set to 0, it is treated as though it were 32768. This allows a one-to-one relationship between counts and pressure or force units. Similarly, a Scale value of -32768 represents a negative one-to-one relationship between counts and position units (increasing counts mean decreasing pressure or force units).

Note: In RMC100 CPU firmware prior to 19991216, these scales could not be set to 0 or -32768.

Scale is defined as 32768 times the Prescale Divisor times the number of pressure units for pressure axes or force units for differential force axes per count:

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Where P0 and P1 are two pressures for forces and C0 and C1 are the corresponding counts at those pressures/forces. The Prescale Divisor is specified in the Configuration Word.

In pressure and force applications, Scale can be used for two purposes:

Transducer Compensation: The Scale parameter compensates for differences in analog transducers. Each transducer will indicate a different current or voltage level for the same pressure. Usually, only a small change from the default value is necessary to compensate the transducer.
Pressure Translation: A second and more useful feature of Scale is its ability to translate a fixed physical reading to usable pressure units (pressure units from thousandths to hundredths or vice versa).

Click here for Pressure/Force Scale and Offset examples