CN103776585A - Hydraulic indicator error inspection method - Google Patents

Abstract

The invention belongs to the technical field of detection, and relates to a hydraulic indicator error inspection method. The method comprises the following steps: step one, connecting a potentiometer with the inside of a hydraulic indicator error inspection circuit to replace two original externally connected resistance boxes, the largest resistance value being equal to the resistance sum of the two original resistance boxes; step two, adjusting the potentiometer to the maximum resistance, at the moment, the resistance R of the potentiometer satisfying a formula: R=R(x)+R(y); step three, measuring voltages U at the two ends of the potentiometer, and calculating currents I; step four, when the potentiometer is adjusted to be balanced with the bridge of a hydraulic indicator, respectively measuring voltages U(x) and U(y) at the two ends R(x) and R(y), and respectively calculating the R(x) and the R(y); and step five, calculating the errors of the hydraulic indicator. By using the method provided by the invention, the adjustment is convenient, the test precision is guaranteed, and the test efficiency is improved.

Description

A kind of Hydraulic Pressure Indicator error-detecting method

Technical field

The invention belongs to detection technique field, relate to a kind of Hydraulic Pressure Indicator error-detecting method.

Background technology

The hydraulic air indicator series of products of enterprise, its inspection method and testing efficiency have been not suitable with the needs of modern production.

Existing Hydraulic Pressure Indicator inspection method adopts adjustable ac source to power to product, resistance R 1 and the R2 of access analog sensor, simultaneously two resistance boxes of outside connection.The in the situation that of keeping two resistance box resistances and remain unchanged in the time of balanced bridge, an increase, the regulative mode that another reduces makes bridge balance.Because resistance box can not regulate continuously, after therefore needing repeatedly to regulate, just can make bridge balance.After the resistance of artificial two resistance boxes of reading, look into the corresponding form of error and draw the error of indicator according to these two resistances.The process of whole inspection error approach is loaded down with trivial details, very easily causes maloperation, affects measuring accuracy.

Summary of the invention

Technical matters to be solved by this invention is: provide a kind of measuring accuracy high, Hydraulic Pressure Indicator error-detecting method easy and simple to handle.

Technical solution of the present invention is: a kind of Hydraulic Pressure Indicator error-detecting method, is characterized by described inspection method and comprise the following steps:

Step 1, innerly in Hydraulic Pressure Indicator error-detecting circuit connects a pot and replaces original two outside resistance boxes that connect, its maximum value equal original two resistance boxes resistance and;

Step 2, is transferred to maximum value by pot, now, and potentiometric resistance value R=R (x)+R (y); Wherein, R (y) is the resistance value of pot center head to earth terminal; R (x) is the resistance value of pot center head to the other end;

Step 3, measures the voltage U at pot two ends, calculates electric current I according to following formula:

$I=\frac{U}{R};$

Step 4, while regulating pot to the bridge balance of Hydraulic Pressure Indicator, the voltage U (x) and the U (y) that measure respectively R (x) and R (y) two ends, calculate respectively R (x) and R (y) by following formula:

$R\left(x\right)=\frac{U\left(x\right)}{I};$

$R\left(y\right)=\frac{U\left(y\right)}{I};$

Step 5, calculate Hydraulic Pressure Indicator error according to following formula:

$\mathrm{\σ}=\frac{R\left(x\right)-R\left(y\right)}{8}\×100\%;$

Wherein, σ is Hydraulic Pressure Indicator error.

The invention has the beneficial effects as follows: Hydraulic Pressure Indicator error-detecting method of the present invention, adopt pot to replace original two outside resistance boxes that connect, easy to adjust; Meanwhile, the present invention has adopted formula to calculate error, has replaced the method for past manual record and the conversion index error of tabling look-up, and has guaranteed measuring accuracy, has improved testing efficiency.

Accompanying drawing explanation

The Hydraulic Pressure Indicator error-detecting circuit of Fig. 1 for using in Hydraulic Pressure Indicator error-detecting method of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.

Referring to Fig. 1, its Hydraulic Pressure Indicator error-detecting circuit for using in Hydraulic Pressure Indicator error-detecting method of the present invention.

A kind of Hydraulic Pressure Indicator error-detecting of the present invention method, comprises the following steps:

Step 1, innerly in Hydraulic Pressure Indicator error-detecting circuit connects a pot and replaces original two outside resistance boxes that connect, its maximum value equal original two resistance boxes resistance and;

Step 2, is transferred to maximum value by pot, now, and potentiometric resistance value R=R (x)+R (y); Wherein, R (y) is the resistance value of pot center head to earth terminal; R (x) is the resistance value of pot center head to the other end;

Step 3, measures the voltage U at pot two ends, calculates electric current I according to following formula:

$I=\frac{U}{R};$

Step 4, while regulating pot to the bridge balance of Hydraulic Pressure Indicator, the voltage U (x) and the U (y) that measure respectively R (x) and R (y) two ends, calculate respectively R (x) and R (y) by following formula:

$R\left(x\right)=\frac{U\left(x\right)}{I};$

$R\left(y\right)=\frac{U\left(y\right)}{I};$

Step 5, calculate Hydraulic Pressure Indicator error according to following formula:

$\mathrm{\σ}=\frac{R\left(x\right)-R\left(y\right)}{8}\×100\%;$

Wherein, σ is Hydraulic Pressure Indicator error.

Embodiment 1:

The error-detecting form of the Hydraulic Pressure Indicator pick-up unit of making according to this inspection method is as shown in table 1:

Table 1

Table 1(is continuous)

Claims (1)

1. a Hydraulic Pressure Indicator error-detecting method, is characterized by described inspection method and comprises the following steps:

Step 1, innerly in Hydraulic Pressure Indicator error-detecting circuit connects a pot and replaces original two outside resistance boxes that connect, its maximum value equal original two resistance boxes resistance and;

Step 2, is transferred to maximum value by pot, now, and potentiometric resistance value R=R (x)+R (y); Wherein, R (y) is the resistance value of pot center head to earth terminal; R (x) is the resistance value of pot center head to the other end;

Step 3, measures the voltage U at pot two ends, calculates electric current I according to following formula:

$I=\frac{U}{R};$

Step 4, while regulating pot to the bridge balance of Hydraulic Pressure Indicator, the voltage U (x) and the U (y) that measure respectively R (x) and R (y) two ends, calculate respectively R (x) and R (y) by following formula:

$R\left(x\right)=\frac{U\left(x\right)}{I};$

$R\left(y\right)=\frac{U\left(y\right)}{I};$

Step 5, calculate Hydraulic Pressure Indicator error according to following formula:

$\mathrm{\σ}=\frac{R\left(x\right)-R\left(y\right)}{8}\×100\%;$

Wherein, σ is Hydraulic Pressure Indicator error.

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