2/1 voltage ratio self-calibration method of voltage divider

Abstract

The invention provides a 2 / 1 voltage ratio self-calibration method of a voltage divider. The 2 / 1 voltage ratio self-calibration method comprises the steps of a step 1, applying a DC voltage U1 on a tested voltage divider and a reference voltage divider, measuring a voltage difference deltau1 between a resistor RY in the tested voltage divider and a resistor R2 in the reference voltage divider; a second step, interchanging the positions of a resistor RX and the resistor RY in the tested voltage divider; a third step, applying a DC voltage U2 on the tested voltage divider and the reference voltage divider, measuring a voltage difference deltau2 between the voltage of the resistor RX in the tested voltage divider and the voltage of the resistor R2 in the reference voltage divider; and a fourth step, according to the U1, U2, deltau1 and deltau2, calculating the actual voltage ratio K and a measuring uncertainty d of the tested voltage divider. Compared with the prior art, the 2 / 1 voltage ratio self-calibration method of the voltage divider is advantageous in that the 2 / 1 voltage ratio of the voltage divider can be accurately acquired without direct measurement for a resistance or use of a standard voltage divider with a higher accuracy grade.

Description

Technical field [0001] The invention relates to a method for calibrating the voltage divider ratio of a voltage divider, in particular to a method for self-calibrating the voltage divider ratio of 2 / 1. Background technique [0002] For a voltage divider with a voltage divider ratio of 2 / 1, the resistance value of the high-voltage arm is equal to the resistance value of the low-voltage arm. For this special voltage divider with a nominal voltage divider ratio of 2 / 1, how to obtain the accurate value of the voltage divider ratio is one of the key issues in the traceability of the DC voltage proportional value. Generally, two methods are commonly used to determine the voltage division ratio: one is to determine the resistance ratio by measuring the resistance, and then the resistance ratio is equivalent to the voltage division ratio at low voltage; the other method is to use a higher accuracy level Calibrate the tested voltage divider with the standard voltage divider. However, th...

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Problems solved by technology

Due to the large resistance span of the voltage divider, the above-mentioned methods of measuring resistance are often used to complete the resistance measurement of the voltage divider, which requires high equipment, expensive equipment, and the measurement process is relatively complicated.

[0004] When using the second method, when the accuracy level of the calibrated voltage divider is higher or already the highest accuracy level, it is difficult to find a suitable standard voltage divider as a standard device, which leads to the failure of the second method

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