CN100562757C - A Common and Discrete Calibration Method for Test Channels - Google Patents

Abstract

The present invention relates to the common and separate calibration method of a kind of test channel, be public passage with a certain passage, on the basis that all passages are demarcated jointly, by test result analysis to standard component, certain passage is demarcated separately, or some identical passage demarcated jointly, solve traditional scaling method and adjusted error complicated operation, the problem that wastes time and energy.Adopt the common and separate calibration method of test channel of the present invention not only to guarantee the accuracy of test data, improved production efficiency, also effectively reduced raw-material waste.

Description

A Common and Discrete Calibration Method for Test Channels

technical field

The present invention relates to the technical field of a cable testing method, in particular to a common and separate calibration method for test channels

Background technique

In the process of cable testing, since there are many pairs of cables, multiple test channels are often required. Cable test equipment switches to different test channels to obtain data through computer analysis of test tasks. However, in the manufacturing process of cable testing equipment, due to the selection of components, manufacturing process and other reasons, there will inevitably be small errors on different test channels for the same standard part. When the test value is large, this error is completely controlled within the test deviation range of the instrument and can be ignored. But when the test value is small, this error will directly affect the accuracy of the test data. In the past, the only way to eliminate errors as much as possible was to constantly adjust the manufacturing process and replace components, which was time-consuming and labor-intensive. And when there are many test items, the process of repeated adjustment is even more cumbersome.

Contents of the invention

The purpose of the present invention is to provide a common and discrete calibration method for test channels. On the basis of using a certain channel as a common channel and performing common calibration on all channels, through the analysis of the test results of standard parts, a certain channel is individually calibrated. Calibration, or common calibration of some similar channels, solves the problem of complicated, time-consuming and labor-intensive adjustment errors in traditional calibration methods.

In order to achieve the above object, the present invention provides a common and discrete calibration method for test channels, which is characterized in that it includes the following steps: a) standard parts are connected to the test channels that will be used as public calibration channels;

b) The computer-controlled test sub-equipment commands the near-end and far-end wiring rack relay matrix to complete the N selection function through the control line, and connect the channel where the standard part is located to the public test channel;

c) The test sub-equipment completes the calibration of the public calibration channel, transmits the data to the computer through the serial port for processing, and uses this calibration data as the calibration result of all channels;

d) Connect the standard part to another test channel, repeat step b, the test sub-equipment completes the test of this channel, transmits the data to the computer through the serial port for processing, and uses the calibration result of step c to calculate the channel to the standard part Test Results;

e) Repeat step d until all channels are tested;

f) Compare the test data of each channel with the standard value of the standard part, and separately calibrate the channel with a large deviation, and the individually calibrated data is only valid for the calibrated channel.

Channels with the same test data can be calibrated together.

For different test items, each test channel needs to be re-calibrated for public and discrete.

The invention has the beneficial effects of not only ensuring the accuracy of test data, improving production efficiency, but also effectively reducing the waste of raw materials.

Description of drawings

Fig. 1 is a schematic diagram of the test equipment of the present invention.

Label description:

1. Computer 2. Serial port 3. Test sub-equipment (single-chip microcomputer system)

4. Near-end terminal block relay matrix 5. Remote terminal block relay matrix

6. Control signal 7. Near-end public channel 8. Remote public channel

9. Test port 10. Standard parts

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The computer (1) communicates with the test sub-equipment (single-chip microcomputer system) (3) through the serial port (2), and the near-end public channel (7) and the far-end public channel (8) of the test sub-equipment (single-chip microcomputer system) communicate with the The near-end wiring rack relay matrix (4) and the far-end wiring rack relay matrix (5) are connected, and the computer controls (4), (5) through the test sub-equipment control line (6) to connect (7), (8) to Corresponding test port (9).

A common and discrete calibration method for test channels, comprising the following steps:

a) Connect the standard part (10) (such as a resistor) to the test channel that will be used as a public calibration channel, such as channel one;

b) The computer-controlled test sub-equipment commands the near-end and far-end wiring rack relay matrix to complete the N selection function through the control line, and connect channel one to the public test channel;

c) The test sub-equipment completes the calibration of the public calibration channel, transmits the data to the computer through the serial port for processing, and uses this calibration data as the calibration result of all channels;

d) Connect the standard part (10) to another test channel, such as channel two, repeat step b, the test sub-equipment completes the calibration of this channel, transmits the data to the computer through the serial port for processing, and uses the calibration result of step c Calculate the test result of the channel to the standard part (10);

e) Repeat step d until all channels are tested;

f) Compare the test data of each channel with the standard value of the standard part, and separately calibrate the channel with a large deviation, and the individually calibrated data is only valid for the calibrated channel.

Channels with the same test data can be calibrated together. For different test items, such as capacitance, each test channel needs to be re-calibrated for public and discrete.

Claims (3)

1, the common and separate calibration method of a kind of test channel is characterized in that may further comprise the steps:

A) standard component is connected to on the test channel as public demarcation passage;

B) computer control test subset is by control line order near-end, and far-end patch bay relay matrix is finished N and selected a function, and the passage at standard component place is connected on the common test passage;

C) the test subset is finished the demarcation of public demarcation passage, data is transferred to computing machine by serial port handles, with the calibration result of this nominal data as all passages;

D) standard component is connected to another test channel, repeating step b, the test subset is finished the test of this passage, and data are transferred to computing machine by serial port, calculates the test result of this passage to standard component with the calibration result of step c;

E) repeating step d finishes test until all passages;

F) test data of each passage and the standard value of standard component are compared, the passage that deviation is bigger is demarcated separately, the data of demarcating are only effective to this demarcation passage separately.

2, the common and separate calibration method by the described a kind of test channel of claim 1 is characterized in that: the passage that test data is identical is demarcated jointly.

3, the common and separate calibration method by the described a kind of test channel of claim 1, it is characterized in that: for different test events, each test channel need be carried out public and separate calibration again.

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