CN110553788A

CN110553788A - Calibration method of sensor signal transmitting device

Info

Publication number: CN110553788A
Application number: CN201910841590.3A
Authority: CN
Inventors: 彭雯
Original assignee: Hodinger Baldwin Suzhou Electronic Measurement Technology Co Ltd
Current assignee: Hodinger Baldwin Suzhou Electronic Measurement Technology Co Ltd; Hottinger Bruel and Kjaer Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2019-12-10

Abstract

the scheme is a calibration method of a sensor signal transmitting device, which specifically comprises the following steps: presetting calibration parameters: calculating standard GI, GD, GO and Vzero values according to the preset calibration parameters, and writing the standard GI, GD, GO and Vzero values into an RAM; automatically unloading to zero point, and carrying out zero point calibration; automatically loading to full scale, and calibrating the full scale; calculating actual GI, GD, GO and Vzero values, and rewriting the actual GI, GD, GO and Vzero values into the RAM; after the weight is automatically unloaded, whether the output of the PGA308 calibration sensor at the zero point meets the preset requirement is detected; if yes, writing actual GI, GD, GO and Vzero values into a programmable memory; reading the programmable memory, judging whether the written value is correct, and if so, finishing adjusting the range of the signal transmitting device; if not, the steps are executed again. The calibration method can automatically detect the process parameters and transmit the measured values in a specific signal form so as to be displayed and adjusted, and has high precision and stable and reliable work.

Description

calibration method of sensor signal transmitting device

Technical Field

The invention relates to the field of industrial control, in particular to a calibration method of a sensor signal transmitting device.

background

with the development of industry, people have higher and higher requirements on the aspects of precision, user experience and the like of the transmitter. Pressure is one of the important parameters in industrial production processes, and accurate detection and control of the pressure are indispensable conditions for ensuring the operation of the production process and the safety of equipment. The PGA308 is an ideal building block for resistive bridge sensor conditioning and general data. Digitally programmable coarse offsets, fine offsets and may be controlled in real time or permanently programmed into the PGA 308. The prior art has the following defects: the sensor is calibrated manually, the speed is slow, and the efficiency is relatively low.

Disclosure of Invention

in order to overcome the defects of the prior art, the invention aims to provide a calibration method of a sensor signal transmitting device, which has higher precision and stable and reliable work.

in order to achieve the purpose, the invention is realized by the following technical scheme:

a calibration method of a sensor signal transmitting device specifically comprises the following steps:

Step (1): presetting calibration parameters: calculating standard GI, GD, GO and Vzero values according to the preset calibration parameters, and writing the standard GI, GD, GO and Vzero values into an RAM;

step (2): automatically unloading to zero point, and carrying out zero point calibration;

And (3): automatically loading to full scale, and calibrating the full scale;

And (4): calculating actual GI, GD, GO and Vzero values, and rewriting the actual GI, GD, GO and Vzero values into the RAM;

and (5): after the weight is automatically unloaded, whether the output of the PGA308 calibration sensor at the zero point meets the preset requirement is detected;

and (6): if the result in step (5) is yes, writing the actual GI, GD, GO, Vzero values to the programmable memory;

And (7): reading the programmable memory and judging whether the written value is correct or not;

And (8): if the result in the step (7) is yes, the adjustment of the measuring range of the signal transmitting device is finished;

And (9): and (4) if the result in the step (7) is negative, re-executing the step (1).

preferably, the calibration method of the sensor signal transmitter is characterized in that the preset calibration parameters are determined according to theoretical zero and full degrees of the PGA308 calibration sensor.

Preferably, in the calibration method of the sensor signal transmitter, whether the predetermined requirement is met in the step (5) is determined according to the PGA308 calibration of the zero-point range and the full range of the sensor.

Preferably, in the calibration method of the sensor signal transmitting apparatus, the step (7) of determining whether the written value is correct specifically determines whether the written value is consistent with a value in the read RAM, and if so, the written value is correct.

Preferably, the calibration method of the sensor signal transmitter, wherein step (1) further comprises a PGA308 calibration sensor communicating with a computer, specifically communicating with the computer in a manner of RS232 to UART adapter.

the invention has the advantages that: the calibration method of the sensor signal transmitting device adopts the PGA308 to calibrate the sensor to realize automatic calibration, repeats the configuration and measurement process until correct voltage is obtained, and can record test data during calibration so as to facilitate subsequent query. The calibration method can automatically detect the process parameters and transmit the measured values in a specific signal form so as to be displayed and adjusted, has higher precision and stable and reliable work, does not need to be calibrated frequently, and can track the data during calibration.

Drawings

Fig. 1 is a schematic diagram of a calibration method of a sensor signal transmitting device according to an embodiment of the present invention.

Detailed Description

the present invention will be described in further detail with reference to the following embodiments and the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

As shown in fig. 1, the calibration method of the sensor signal transmitting device specifically includes the following steps:

s1: presetting calibration parameters: calculating standard GI, GD, GO and Vzero values according to the preset calibration parameters, and writing the standard GI, GD, GO and Vzero values into an RAM;

S2: automatically unloading to zero point, and carrying out zero point calibration;

s3: automatically loading to full scale, and calibrating the full scale;

s4: calculating actual GI, GD, GO and Vzero values, and rewriting the actual GI, GD, GO and Vzero values into the RAM;

S5: after the weight is automatically unloaded, whether the output of the PGA308 calibration sensor at the zero point meets the preset requirement is detected;

S6: if the result of S5 is yes, writing the actual GI, GD, GO, Vzero values to the programmable memory;

S7: reading the programmable memory and judging whether the written value is correct or not;

s8: if the result of S7 is yes, finishing adjusting the measuring range of the signal transmitting device;

S9: if the result of S7 is NO, S1 is re-executed. The loop S1-S7 is repeated until the written value is correct, and if the result of S7 is positive, the adjustment of the span of the signal transmission device is completed. The PGA308 calibration sensor is automatically calibrated, the configuration and measurement process may be repeated until the correct voltage is obtained, and test data may be recorded during calibration to facilitate subsequent interrogation.

The calibration method of the sensor signal transmitting device adopts the PGA308 to calibrate the sensor to realize automatic calibration, repeats the configuration and measurement process until correct voltage is obtained, and can record test data during calibration so as to facilitate subsequent query. The calibration method can automatically detect the process parameters and transmit the measured values in a specific signal form so as to be displayed and adjusted, has higher precision and stable and reliable work, does not need to be calibrated frequently, and can track the data during calibration.

preferably, the preset calibration parameters are determined according to the theoretical zero point and the full scale of the PGA308 calibration sensor.

Whether the preset requirements are met in the step (5) is determined according to the self zero-point range and the full range of the PGA308 calibration sensor.

and (4) judging whether the written value is correct or not in the step (7), namely judging whether the written value is consistent with the value in the read RAM or not, and if so, judging that the written value is correct.

PGA308 communication, namely, the communication between the PGA308 and a computer can be realized by using an RS 232-UART adapter, the Tx and Rx of the RS 232-UART adapter are connected with One-Wire of the PGA308, the RS232 baud rate range is 4.8K ~ 114K, no parity check exists, 8 bit data bits and 1 bit stop bit, the first character of a data packet sent by the RS232 is necessarily 0x55 and is used for detecting the baud rate of the PGA308 One-Wire communication.

the working principle of the PGA308 is as follows: vout = [ (Vin + Vcoarse) × GI + Vzero ] × GD = GO.

wherein, Vout: outputting voltage;

Vin: differential voltage input at the ends of Vin1 and Vin 2;

Vcoarse: coarse adjustment of zero point;

vzero: fine adjustment of zero point;

GI, GD, GO: respectively corresponding to 3 amplification factors;

while embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A calibration method of a sensor signal transmitting device is characterized by comprising the following steps:

and (3): automatically loading to full scale, and calibrating the full scale;

and (6): if the result of the step (5) is yes, writing the actual GI, GD, GO and Vzero values into a programmable memory;

And (7): reading the programmable memory and judging whether the written value in the step (6) is correct or not;

And (8): if the result of the step (7) is yes, the adjustment of the measuring range of the signal transmitting device is completed;

and (9): and (5) if the result of the step (7) is negative, re-executing the step (1).

2. The method of calibrating a sensor signal transmitter according to claim 1, wherein the predetermined calibration parameters are determined based on the theoretical zero and full scale of the PGA308 calibration sensor.

3. The method for calibrating a sensor signal transmitting device according to claim 1, wherein the step (5) determines whether the predetermined requirements are met, particularly, whether the PGA308 calibrates the range of the zero point and the range of the full scale of the sensor.

4. a calibration method for a transducer signal transmitter according to claim 1, characterized in that said step (7) of determining whether the written value is correct or not, in particular, determining whether the written value is identical to the value in the read RAM, and if so, determining that the written value is correct.

5. The method for calibrating a sensor signal transmitter according to claim 1, wherein step (1) is preceded by a PGA308 calibration sensor communicating with a computer, in particular, communicating with the computer by means of an RS232 to UART adapter.