CN101702014A - Test method for basic error of zero-scale indication - Google Patents

Abstract

The invention discloses a test method of an intrinsic error of a zero level indicating value, which is characterized by comprising the following steps of: before starting a machine, connecting a standard test instrument (1) with a corresponding test end hole of a calibrated electrical level type tester (3) by using a test wiring harness (2); then starting the machine, operating the standard test instrument and the calibrated electrical level type tester (3) in an assembling mode according to functions, measuring data of 6 error measuring points including a working frequency lowest end, a highest end and a reference frequency and the like, wherein each frequency point is measured for 3 times and recorded; and then computing with all the acquired 18 primary data to obtain a test result of the intrinsic error of the zero level indicating value. By using single multifunctional standard tester, the invention simplifies test system and test connecting line operation, reduces test procedures, and shortens the whole test time to be about one third of that of the traditional test method.

Description

Test method for basic error of zero-scale indication

technical field

The invention relates to a test method for the basic error of level test instrument calibration.

Background technique

In the calibration test of level test instruments, the basic error test of zero-level indication is a necessary test item. The existing problems in the basic error test method of zero-level indication are:

The structure of the test system is complex due to the use of multiple standard test instruments with a single function;

Under the same impedance condition, it must be shut down several times to change the connection line of the test system, and there are many procedures;

The number of error measurement points is more than 10, and the specific number cannot be determined before the test. The redundant measurement points will increase the workload and have little effect on the test results;

The number of measurements for each frequency point is more than 5, and the specific number cannot be determined before the test. The redundant number of measurements increases the workload, but has little effect on the test results.

Due to the existence of the above problems, the existing zero-level indication basic error test method has many procedures and low efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to provide a basic error test method for zero-level indication to solve the complex structure of the test system existing in the prior art, and under the same impedance condition, it must be shut down several times to change the connection of the test system There are too many lines and processes.

The technical solution of the present invention is as follows: it includes the following process: before starting up, connect the standard test instrument with the corresponding test port hole of the calibrated level test instrument with the test wire harness; The level test instrument measures the data of 6 error measurement points including the lowest end, the highest end and the reference frequency of the working frequency. Each frequency point is measured 3 times and recorded, and then all 18 original data obtained are used for measurement. Calculate and obtain the test results of the basic error of the zero-level indication.

In the above technical scheme, the present invention uses a single multifunctional standard test instrument to simplify the test system with the operation function combination on the standard test instrument; to simplify the test connection line with the operation function combination on the standard test instrument, under the same impedance condition The test connection line is fixed.

The advantages of using this method are:

Use a single multifunctional standard test instrument to simplify the test system;

Under the same impedance condition, the fixed test connection line is used to complete the connection at one time. In this test stage, it is not necessary to shut down several times to change the test connection line, simplify the operation of the test connection line, and reduce the test process;

Determine 6 error measurement points including the lowest end, the highest end and the reference frequency of the working frequency to reduce the test time;

Make sure to measure each frequency point 3 times to reduce the test time.

After adopting the method, the whole test time is shortened to about one-third of the existing test method.

Description of drawings

Figure 1 is a schematic diagram of the present invention.

Detailed ways

Embodiments of the present invention: the present invention includes the following process: before starting the machine, connect the standard test instrument 1 with the calibrated level class tester 3 with the test harness 2 corresponding to the required calibration impedance of the calibrated level class tester 3 Connect the corresponding test port holes, then turn on the power, operate the standard test instrument 1 and the calibrated level test instrument 3 according to the function combination, and measure the data of 6 error measurement points including the lowest end, the highest end and the reference frequency of the working frequency. Each frequency point is measured 3 times and recorded, and then all 18 original data obtained are used for calculation to obtain the basic error test results of the zero-level indication.

Claims (1)

1. test method of intrinsic error of zero level indicating value, it is characterized in that: it comprises following process: before the start, with test wire harness (2) code test instrument (1) is connected with the corresponding test stomidium of level class testing instrument (3) that is calibrated; Start then, by function combinations operation standard test apparatus (1) and the level class testing instrument (3) that is calibrated, measurement comprises frequency of operation least significant end, most significant end and reference frequency in 6 interior error measure point data, each Frequency point is measured 3 times and record, use whole 18 raw data of being obtained to calculate again, draw the intrinsic error of zero level indicating value test findings.

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