CN203849394U

CN203849394U - An automatic calibrating apparatus of a digital multimeter

Info

Publication number: CN203849394U
Application number: CN201420108306.4U
Authority: CN
Inventors: 王杨
Original assignee: Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; Hebei Electric Power Construction Adjustment Test Institute
Current assignee: Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; Hebei Electric Power Construction Adjustment Test Institute
Priority date: 2014-03-11
Filing date: 2014-03-11
Publication date: 2014-09-24
Anticipated expiration: 2024-03-11

Abstract

The utility model relates to an automatic calibrating apparatus of a digital multimeter. The automatic calibrating apparatus of the digital multimeter comprises a metering standard source, a GPIB bus, a control bus driver, a data bus driver, a GPIB control module, a single-chip microcomputer, an interface module, a computer, a display, a printer and a keyboard. The beneficial effects of the automatic calibrating apparatus of the digital multimeter are that the automatic calibrating apparatus of the digital multimeter can carry out testing, calibration, data printing, data management, system maintenance, etc. on all the digital multimeters with digit interfaces; man-machine conversation is very simple and convenient; the testing speed is fast; labour and time are saved; simultaneously, accuracy of value transmission is guaranteed; requirements of metering detecting rules are satisfied; and high practicality is realized.

Description

A kind of automatic calibrator of digital multimeter

Technical field

The utility model belongs to digital multimeter measurement verification field, relates to a kind of automatic calibrator of digital multimeter.

Background technology

Digital multimeter, Multifunctional standard source automatic are substantially all with programmable interface, normal manually calibrating can not docking port part function check, data recording in measurement verification, processing, printing certificate etc. will be through loaded down with trivial details step and longer times, the work efficiency of not only measuring is low, and the accuracy of data can be subject to certain impact.

Utility model content

Technical problem to be solved in the utility model be to provide a kind of can be to examining and determine or calibrate with the digital multimeter of digital interface, the automatic calibrator of digital multimeter simply and easily.

For solving the problems of the technologies described above adopted technical scheme be: a kind of automatic calibrator of digital multimeter, comprises measurement standard source, gpib bus, control bus driver, data bus driver, GPIB control module, single-chip microcomputer, interface module, computing machine, display, printer and keyboard; Described gpib bus connects respectively measured number multimeter and described measurement standard source; Described GPIB control module connects described gpib bus through described control bus driver, data bus driver respectively; Described control bus driver, the two-way connection of data bus driver; The P0 port of described single-chip microcomputer connects the data-interface of described GPIB control module; The P1 port of described single-chip microcomputer connects the address bus interface of described GPIB control module; The external interrupt port of described single-chip microcomputer connects the interrupt output interface of described GPIB control module; The ale signal port of described single-chip microcomputer connects the interface clock signal of described GPIB control module; The Rx port of described single-chip microcomputer and Tx port connect respectively the corresponding port of described interface module; The two-way connection of corresponding port of described interface module and described computing machine; Display, printer and keyboard connect respectively the corresponding port of described computing machine;

The model in described measurement standard source is 5720A; The model of described gpib bus is ACL-IEEE488-4; The model of described control bus driver is SN75161; The model of described data bus driver is SN75160; The model of described GPIB control module is NAT9914; The model of described single-chip microcomputer is AT89C51; The model of described interface module is MAX232; Described computer model is IPC-610H.

The beneficial effects of the utility model are: application the utility model can be examined and determine or calibration, data-printing, data management, system maintenance etc. all digital multimeters with word interface, man-machine conversation is very simple, convenient, test speed is fast, time saving and energy saving, ensured the accuracy of transmission of quantity value simultaneously, meet the requirement of measurement verification regulations, there is very strong practicality.

Brief description of the drawings

Fig. 1 is theory diagram of the present utility model.

Embodiment

Embodiment is as shown in Figure 1 known, and the present embodiment comprises measurement standard source, gpib bus, control bus driver, data bus driver, GPIB control module, single-chip microcomputer, interface module, computing machine, display, printer and keyboard; Described gpib bus connects respectively measured number multimeter and described measurement standard source; Described GPIB control module connects described gpib bus through described control bus driver, data bus driver respectively; Described control bus driver, the two-way connection of data bus driver; The P0 port of described single-chip microcomputer connects the data-interface of described GPIB control module; The P1 port of described single-chip microcomputer connects the address bus interface of described GPIB control module; The external interrupt port of described single-chip microcomputer connects the interrupt output interface of described GPIB control module; The ale signal port of described single-chip microcomputer connects the interface clock signal of described GPIB control module; The Rx port of described single-chip microcomputer and Tx port connect respectively the corresponding port of described interface module; The two-way connection of corresponding port of described interface module and described computing machine; Display, printer and keyboard connect respectively the corresponding port of described computing machine;

The utility model adopts 5720A as measurement standard source, digital multimeter and multimeter are carried out to automatic gauge test, the thought that the utility model is simply concise, easy to operate, apply in a flexible way, except completing the measurement function of basic demand, also has following function:

Man-machine dialog interface flexibly; Instrument address and test event can be selected; Test process Dynamic data display; Color mark function; Certificate and primary template can be selected; Certificate and original generation project can be selected; Can automatically remove zero point, and revise in data afterwards; Program will have expandability.

For the instrument that there is no serial ports, can realize the automatic data collection to standard device, require the manual input measurement value of tested equipment simultaneously, and automatically data are carried out to computing.

The DC voltage of the utility model adjustable digital watch, DC current, alternating voltage, alternating current, five functions of direct current resistance.Calibration item is divided into year stability test and two aspects of fundamental error test.There is instrument address selection function in testing software.

While generating raw readings and certificate, fill in the information relevant with certificate, as certificate number, customer name, address, instrument sequence number, current humiture, program writes certificate or raw readings relevant information.

The utility model will be realized multi-function calibrator 5720A to the automatic calibration of digital multimeter and automatically generate raw readings and certificate, also the semi-automation realizing there is no the inferior grade digital multimeter that serial ports model is various is examined and determine simultaneously, and automatically generate raw readings and certificate.

Claims

1. an automatic calibrator for digital multimeter, is characterized in that: comprise measurement standard source, gpib bus, control bus driver, data bus driver, GPIB control module, single-chip microcomputer, interface module, computing machine, display, printer and keyboard; Described gpib bus connects respectively measured number multimeter and described measurement standard source; Described GPIB control module connects described gpib bus through described control bus driver, data bus driver respectively; Described control bus driver, the two-way connection of data bus driver; The P0 port of described single-chip microcomputer connects the data-interface of described GPIB control module; The P1 port of described single-chip microcomputer connects the address bus interface of described GPIB control module; The external interrupt port of described single-chip microcomputer connects the interrupt output interface of described GPIB control module; The ale signal port of described single-chip microcomputer connects the interface clock signal of described GPIB control module; The Rx port of described single-chip microcomputer and Tx port connect respectively the corresponding port of described interface module; The two-way connection of corresponding port of described interface module and described computing machine; Display, printer and keyboard connect respectively the corresponding port of described computing machine; The model in described measurement standard source is 5720A; The model of described gpib bus is ACL-IEEE488-4; The model of described control bus driver is SN75161; The model of described data bus driver is SN75160; The model of described GPIB control module is NAT9914; The model of described single-chip microcomputer is AT89C51; The model of described interface module is MAX232; Described computer model is IPC-610H.