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| resources:eval:user-guides:eval-ad7441x:tools:thermocouple [06 Jul 2021 17:45] – added table of contents Bríde Ní Riagáin | resources:eval:user-guides:eval-ad7441x:tools:thermocouple [14 Sep 2021 16:11] (current) – updated link back to TOC Bríde Ní Riagáin | ||
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| \\ Refer to figure 1 for a high level block diagram of the required connections for thermocouple measurements. | \\ Refer to figure 1 for a high level block diagram of the required connections for thermocouple measurements. | ||
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| + | \\ The thermocouple generates a voltage that is proportional to the temperature difference between the measurement point and where the thermocouple is connected at the screw terminals, the cold junction. | ||
| + | To be able to determine the temperature at the measurement point, the cold junction temperature must be measured along with the voltage generated by the thermocouple. | ||
| \\ The thermocouple should be connected between the I/OP and I/ON screw terminals. The AD74413R can be configured in Voltage Input mode, with the ADC range set to the ±104.16mV to measure the small voltage generated by the Thermocouple measurements. | \\ The thermocouple should be connected between the I/OP and I/ON screw terminals. The AD74413R can be configured in Voltage Input mode, with the ADC range set to the ±104.16mV to measure the small voltage generated by the Thermocouple measurements. | ||
| \\ The AD74413R can support cold junction compensation measurements by measuring the response from an external thermistor resistor divider using the onboard diagnostics. The LVIN pin can be used to measure the thermistor voltage within an ADC range of 2.5V. The resistor divider can be placed close to the terminal pins where the thermocouple is connected. | \\ The AD74413R can support cold junction compensation measurements by measuring the response from an external thermistor resistor divider using the onboard diagnostics. The LVIN pin can be used to measure the thermistor voltage within an ADC range of 2.5V. The resistor divider can be placed close to the terminal pins where the thermocouple is connected. | ||
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| - | ====Background Info==== | ||
| ====Implementation==== | ====Implementation==== | ||
| - | Two measurement steps are taken to determine the temperature of the Thermocouple hot junction. | + | Two measurement steps are taken to determine the temperature of the measurement point. |
| \\ First, the cold junction temperature is measured to establish a reference point for the thermocouple. | \\ First, the cold junction temperature is measured to establish a reference point for the thermocouple. | ||
| Figure 2 shows a snapshot from the AD74413R evaluation board. This circuit shows the implementation required to use the AD74413R to determine T< | Figure 2 shows a snapshot from the AD74413R evaluation board. This circuit shows the implementation required to use the AD74413R to determine T< | ||
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resources/eval/user-guides/eval-ad7441x/tools/thermocouple.1625586355.txt.gz · Last modified: 06 Jul 2021 17:45 by Bríde Ní Riagáin