Pulse counting precision compensation method for dual-bit flowmeter calibrating device

Abstract

The invention discloses a pulse counting precision compensation method for dual-bit flowmeter calibrating device, the method comprises the steps as follows: connecting the pulse signal of the flowmeter F1 to the data collecting card of industrial personal computer (IPC) in two paths; one path is direct while the other path is processed into the sinusoidal signal for input by the programmable filter on the collecting card; setting the sinusoidal signal initial value x(O), inverse matrix initial value P(O), obtaining the signal frequency omega, eliminating low frequency interference signal according to the convergence frequency, correcting the AD sampling interval time Ts; calculating reversing signal triggering phase for building over-determination matrix, obtaining the phase of the signal at reversing time for reverser, according to the phase of the signal at reversing time for reverser, counting the pulse number Ni by the counter, interference pulse number Nd and calculating the correction pulse number N.

Description

technical field [0001] The invention relates to the technical field of flow measurement equipment, in particular to a pulse counting precision compensation method for a double-stage flowmeter verification device. Background technique [0002] With the development of modern industry, the demand for flowmeters continues to increase, especially the pulse output flowmeter (in the case of a stable flow field, the instantaneous flow rate of the pulse output flowmeter is proportional to the pulse frequency) has been unprecedentedly applied, which is of great significance for its rapid and accurate verification. major. Universal verification device, the industrial computer drives the commutator according to the phase-locked signal of the pulse signal of the flowmeter, and can intercept the pulse signal of the flowmeter for the entire period. However, in a dual-stage installation, the measurement accuracy requirements for the pulse count of the other flowmeter cannot be guaranteed. ...

AI Technical Summary

Problems solved by technology

[0004] (1) The common phase coincidence detection circuit is the D flip-flop method. However, if there is phase noise or trigger error in any one of the measurement comparison signals or two measurement comparison signals at the same time, it will have a relatively large impact on the phase coincidence detection output pulse, making There is a phase deviation in the final phase coincidence detection

However, the application of this patent in the double-stage flowmeter verification device requires additional hardware equipment, is not suitable for verifying flowmeters with small instrument coefficients, and has problems such as frequency multiplication of interference pulses and deterioration of measurement results.

[0009] Other non-integer cycle interception signal counting accuracy improvement methods, such as CN1193503C, CN102565673B, CN102931975A, etc., also have problems such as insufficient consideration of interference or the need for additional complex hardware devices

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