Abstract: A cost-effecTIve procedure for adding system diagnosTIc, product diagnosTIc, output drift check, auto-zeroing capability, etc., to your products which are based on the MAX1478, MAX1452, MAX1455, MAX1457, and MAX1463 family of high-performance signal condiTIoning products without changing the test system or adding significant time to the calibration process.
Reference TemperatureControlling the reference temperature is especially necessary for devices with a large temperature coefficient. To minimize the overhead associated with the generation of VCAL, the last calibration temperature can be used as the reference. A reasonable choice is 25 ° C, because it is easy to achieve and control and it is used as the reference for most specifications.
Reference Pressure For gage-pressure sensors, use atmospheric pressure. For absolute-pressure sensors, absolute (not gage) pressure must be used and controlled to the desired accuracy. To minimize the effect of any possible leak in the system, a pressure close to the atmospheric pressure is recommended (100kPA). For high-pressure sensors, atmospheric pressure can be used. Procedure for Setting Up Reference Voltage Complete the compensation / calibration as this is normally done. Apply the reference pressure and the temperature condition to the device. Read the output voltage to the desired accuracy. Store the output voltage, VCAL, in the memory. Procedure for Using Reference Voltage Apply the reference condition to the device. Measure the output voltage, Vout. Read VCAL from memory. Compare the VOUTand VCAL values , dVOUT = VOUT- VCAL. Take any specified action based on the value of dVOUT. For example, shut down the system, call the operator, ignore the device output, etc.
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This approach takes advantage of built-in nonvolatile flash memory included in these low-cost signal conditioners. The concept is implemented by making an accurate measurement of the output voltage at predefined reference conditions and storing it in the flash memory for future reference.
This application note describes a simple and cost-effective procedure for adding diagnostic checks to determine product functionality and sensor output drift. This enhancement can be added to any MAX14XX device with nonvolatile memory without changing the test system or adding significant time to the calibration operation.
MAX14XX signal-conditioning devices are generally used in conjunction with pressure sensors to correct their inherently large temperature error. Although the same principle applies to other types of sensors, this document refers solely to pressure-sensor applications for the sake of simplicity.
Reference TemperatureControlling the reference temperature is especially necessary for devices with a large temperature coefficient. To minimize the overhead associated with the generation of VCAL, the last calibration temperature can be used as the reference. A reasonable choice is 25 ° C, because it is easy to achieve and control and it is used as the reference for most specifications.
Reference Pressure For gage-pressure sensors, use atmospheric pressure. For absolute-pressure sensors, absolute (not gage) pressure must be used and controlled to the desired accuracy. To minimize the effect of any possible leak in the system, a pressure close to the atmospheric pressure is recommended (100kPA). For high-pressure sensors, atmospheric pressure can be used. Procedure for Setting Up Reference Voltage Complete the compensation / calibration as this is normally done. Apply the reference pressure and the temperature condition to the device. Read the output voltage to the desired accuracy. Store the output voltage, VCAL, in the memory. Procedure for Using Reference Voltage Apply the reference condition to the device. Measure the output voltage, Vout. Read VCAL from memory. Compare the VOUTand VCAL values , dVOUT = VOUT- VCAL. Take any specified action based on the value of dVOUT. For example, shut down the system, call the operator, ignore the device output, etc.
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