Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus
A platinum thermal resistance, high-precision technology, applied in the field of measurement and testing, can solve the problems of low precision of output resistance, influence, and failure to satisfy customers
A platinum thermal resistance, high-precision technology, applied in the field of measurement and testing, can solve the problems of low precision of output resistance, influence, and failure to satisfy customers
CN102749520AInactive Publication Date: 2012-10-24BEIJING CONTROL TECH
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[0022] The platinum thermal resistance simulation board of the present invention conforms to the 6U PXI bus board card of the PXI standard specification, and provides multi-channel high-precision platinum thermal resistance output, including an analog part, a digital part and a connector J5 located on the bus board card, such as figure 2 As shown, the digital part includes FPGA chip, temperature sensor, FRAM memory chip, PXI bus and PXI trigger bus; the analog part includes calibration unit and n output resistance modules, n≥1. The following specifically describes the relationship between the circuits and modules in the digital part and the analog part:
[0023] Such as figure 2 As shown, in the analog part, the output resistance module is connected to external instruments through the connector J5, which is used to realize the output of the analog platinum thermal resistance with high precision and low temperature drift, to meet the customer's demand for programmable analog ...
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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...
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Patent Timeline
24 Oct 2012
Publication
CN102749520A
- IPC
- G01R27/08
- Inventors
- 韩小兵; 魏勇