The Realization of 1/2-Bit Blanking Function of 4-1/2-Bit Digital Voltmeter for Test Based on ICL7135
In the performance testing of reliability and environmental testing,digital instruments with digital voltmeters as the core are often needed.When designing a 4-1/2 bit digital voltmeter circuit based on the ICL7135 chip,it is necessary to design the first blanking function for the digital display part.In traditional digital voltmeter circuits,the program control of a microcontroller is used to achieve blanking.When a microcontroller is not used in the circuit design,a new design to achieve first blanking needs to be considered.In this paper,a composite logic gate circuit is designed using the blanking end of the CD4511 decoding chip in the voltmeter circuit,combined with the output signal of the A/D chip,to achieve correct first digit blanking of the circuit.Through experimental verification,the design concept of the composite logic gate circuit is feasible and can ensure the implementation of the first half bit blanking function in the digital voltmeter circuit.
digital voltmetersICL7135blanking circuit designcomposite logic gate circuit
NETL
NSTL
万方数据
维普
