Pressure Sensor Error Analysis

[chris_m]

Hi,

I'm just going through AN1668 in order to do an error analysis of the MPX2050DP, and I'm unsure has to how some of the error values have been calculated.

AN1668 - http://cache.freescale.com/files/sensors/doc/app_note/AN1668.pdf

Span Calibration (4% Vfss):  The value is provided in table 2 but it's not mentioned elsewhere in the document.

Temperature Effect on Span (1.5% Vfss): This value appears to differ from the specification value provided in Table 1. Is there a reason why this is so?

Offset Calibration  and  Offset Stability:  These values are also in table 2 but not mentioned elsewhere.

Temperature Effect on Offset: This appears to have been calculated from the value in table 1.

If anyone is able to explain how these values are calculated, that would be great.

Thanks,

Chris

[david_diaz]

Hello Chris,

The parameters mentioned on the AN1668, shows the MPX2010 errors converted to %VFSS.

In order to get more detailed about the MPX2010 errors, please refer to its datasheet; more specifically at Table 1-Operating Characteristics.

http://www.freescale.com/files/sensors/doc/data_sheet/MPX2010.pdf

Please note that the Full Scale Span (VFSS) is:

MIN                       TYP                         MAX                     

24                           25                           26           mV

In terms of percentage the span has a variation of 4 %VFSS, which is mentioned on the AN1668 as Span Calibration.

Same principle is used for the rest of the parameters.

Please let me know if this information is useful for you.

If I misunderstood your question, feel free to let me know.  I will be glad to help.

Have a great day.

David Diaz.