Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus

Abstract

The invention discloses a multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus. The multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus comprises an analog part and a digital part; the analog part comprises a calibration unit and a plurality of output resistance modules; the output resistance modules are used for being connected with external instruments, and are formed by connecting m digital potentiometers in parallel and then connecting the m digital potentiometers with a resistor R in parallel; the calibration unit is provided with an internal resistance module which has the same structure as the output resistance modules, and is used for realizing the measurement and calibration of the resistances of the internal resistance module or an external resistor; and consequently, the calibration parameters are obtained through utilizing a calibration circuit to calibrate the internal resistance module and are used for revising the output resistance of the output resistance modules. The digital part is used for controlling all the parts and realizing the data interaction with a PXI bus controller. The thermal resistance breadboard can provide multichannel thermal resistance output, the output resistance modules have high precision, are low in price, and have a small size and small temperature drift, through changing the resistor R, the output range of the output resistance can be adjusted, and the output resistance precision is not influenced.

Description

technical field [0001] The invention relates to the field of testing and measurement, specifically, a multi-channel high-precision platinum thermal resistance simulation board based on the PXI bus Background technique [0002] With the wide application of PXI bus technology in the field of testing and measurement, many PXI modules and systems have been developed to meet the needs of different users. At present, there are many companies in the market that provide platinum thermal resistance simulation boards based on PXI bus technology, such as Pickering's 40-262, etc., but the output resistance is composed of a large number of control switches and fixed resistors with different resistance values, such as figure 1 As shown, the size of the output resistance is adjusted by controlling the opening and closing of the switch. Therefore, this kind of platinum thermal resistance simulation board has a complex structure, occupies a large area, and is expensive. Another example is t...

AI Technical Summary

Problems solved by technology

At present, there are many companies in the market that provide platinum thermal resistance simulation boards based on PXI bus technology, such as Pickering's 40-262, etc., but the output resistance is composed of a large number of control switches and fixed resistors with different resistance values, such as figure 1 As shown, the size of the output resistance is adjusted by controlling the opening and closing of the switch. Therefore, this kind of platinum thermal resistance simulation board has a complex structure, occupies a large area, and is expensive.

Another example is the PXI-3110 of Fanhua Measurement and Control Company, limited by its output resistance structure and board area, it can only provide two channels of output resistance

Moreover, the output resistance accuracy of existing platinum thermal analog circuit boards is generally not high, which affects the inability to meet customers' needs for more channel output resistance

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