CN108152776A - A kind of portable digital table characteristic measuring device - Google Patents
A kind of portable digital table characteristic measuring device Download PDFInfo
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- CN108152776A CN108152776A CN201711184436.0A CN201711184436A CN108152776A CN 108152776 A CN108152776 A CN 108152776A CN 201711184436 A CN201711184436 A CN 201711184436A CN 108152776 A CN108152776 A CN 108152776A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
This application discloses a kind of portable digital table characteristic measuring devices; it is characterized in that; including signal source, array switch, component part and output port; the signal source includes the first signal source and second signal source; the array switch includes first switch to the 12nd switch; the component group includes first resistor, second resistance and capacitance, and the output port includes high port, low port, ground protection port and grounding ports.Control unit is further included, described control unit includes instruction control unit and array switch control unit.Present application addresses the prior art by interim the problem of building route survey, time of measuring is shortened, improves measurement efficiency, while avoid human error；Using automatic measurement mode, switched using different accesses, input characteristics and noiseproof feature measuring device are combined into one, realize that different function measures, it is small, light-weight, be easy to portable.
Description
Technical field
This application involves automatic measurement technology field, more particularly to a kind of portable digital table characteristic measuring device.
Background technology
Using large scale integrated circuit and the digital multimeter of Microcomputer Technology, there is accuracy of measurement height, differentiate
The advantages that rate height, auto-shifted measurement, overload capacity are strong, low in energy consumption, function is complete, intuitive display, light structure, in electronic surveying
Field shows powerful vitality, is widely used in the every field of research and production as a kind of basic quasi-instrument.I.e.
Make be many non electrical quantities parameter, such as temperature, pressure etc. can become electrical parameter and use digital versatile by converting
Table is measured.
The input characteristics (zero current, input impedance) of digital table and antijamming capability characteristic (series mode interference, common mode interference)
It is that the important performance characteristic of the digital table characteristic of reflection and digital table test must survey project.Since measuring method is complex,
And without special integrated measuring device, many measurement units are all to build line temporarily in digital the two projects of table of test
Road, time-consuming and laborious and test data repdocutbility are poor.
At present, for the test of input characteristics, only a few unit has dedicated test device, and be mostly function it is single, from
The equipment that row is developed, did not carry out qualification test, performance and function can not all meet at this stage to digital table input characteristics
Testing requirement.
The test of antijamming capability never obtains due attention for a long time.Because antijamming capability is for that
For a little digital tables applied under the stable environment of laboratory, since laboratory electricity consumption have passed through the purification of AC power, introduce
Interference it is less, for test influenced for indoor voltage measurement it is smaller.However, the complicated adverse circumstances tested at the scene
Under, extraneous interference may can bring very big influence to the measurement of digital table voltage.Antijamming capability is as evaluation number
The important technology index of table performance does not reach technology requirement such as, will be directly affecting testing experiment as a result, to leave quality hidden
Suffer from, and this reason be also less prone to be found in malfunction elimination (such as sometimes in model experiment, certain test result compared with
Difference, but in repetition test, the phenomenon are difficult again reproduction, and the antijamming capability for being just most likely due to digital table problematic is made
Into).At this moment, in order to ensure the measurement performance of digital table, the antijamming capability of digital table would have to consider.
Invention content
In view of this, the application provides a kind of portable digital table characteristic measuring device, solves existing measuring device efficiency
The problem of lowly function is single.
The embodiment of the present application provides a kind of portable digital table characteristic measuring device, including signal source, array switch, first device
Part part and output port, the signal source include the first signal source and second signal source, and the array switch is opened including first
It closes to the 12nd switch, the component group includes first resistor, second resistance and capacitance, and the output port includes high-end
Mouth, low port, ground protection port and grounding ports；The second signal source, first switch, second switch, third switch,
Four switches, the 5th switch, the 9th switch and first resistor composition input characteristics measuring circuit；First signal source, the second letter
Number source, the 6th switch, the 7th switch, the 8th switch, the 9th switch, the tenth switch, the 11st switch, the 12nd switch, second
Resistance and capacitance composition noiseproof feature measuring circuit；The first signal source anode respectively with the 6th switch second port, the
12 switch first ports connection, the first signal source cathode respectively with first switch second port, second switch first end
Mouth, the 11st switch first port connection；Second signal source first port is opened respectively with first switch first port, the 7th
Close first port connection, second signal source second port respectively with third switch first port, the 9th switch first port,
Tenth switch first port connection；The second switch second port switchs respectively with the first resistor first port, third
Second port, the 5th switch first port connection；It is described 4th switch first port respectively with the first resistor second port
Connection, the 4th switch second port are connect with the 5th switch second port, the 6th switch first port, the high port；
The 7th switch second port is connect respectively with the second resistance first port, the ground protection port；Described 8th
Switch first port is connect respectively with the second resistance second port, and the 8th switch second port switchs respectively with the 9th
Second port, low port connection；The tenth switch second port is connect with grounding ports；The 11st switch second port
It is connect with capacitance first port；The 12nd switch second port is connect with capacitance second port.
Further, which further includes control unit, and described control unit includes instruction control unit and array is opened
Close control unit；Described instruction control unit for sending switching control instruction and signal source control instruction, while is acquired and is divided
Measurement data is analysed, generates measurement result；The array switch control unit, for receiving the switching control instruction, generation is opened
Close control signal.
Above-mentioned at least one technical solution that the embodiment of the present application uses can reach following advantageous effect：In device panel
Upper design to corresponding port, solves the problems, such as that existing lean on builds route survey temporarily with measured number voltmeter input port,
Time of measuring is shortened, improves measurement efficiency, while avoid human error；It is logical using difference using automatic measurement mode
Road switches, and input characteristics and noiseproof feature measuring device are combined into one, and realizes that different function measures, small, light-weight,
It is easy to portable；By the way of plus signal, the electrical security of measuring system is ensure that after first connecting.
Description of the drawings
Attached drawing described herein is used for providing further understanding of the present application, forms the part of the application, this Shen
Illustrative embodiments and their description please do not form the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is a kind of portable digital table characteristic measuring device structure diagram provided by the embodiments of the present application；
Fig. 2 is portable digital table characteristic measuring device input characteristics measuring circuit schematic diagram；
Fig. 3 is portable digital table characteristic measuring device series mode interference measuring circuit schematic diagram；
Fig. 4 is portable digital table characteristic measuring device common mode interference measuring circuit schematic diagram；
Fig. 5 is the portable digital table characteristic measuring device schematic diagram that Fig. 1 is provided；
Fig. 6 is another portable digital table characteristic measuring device structure diagram provided by the embodiments of the present application.
Specific embodiment
Purpose, technical scheme and advantage to make the application are clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall in the protection scope of this application.
Below in conjunction with attached drawing, the technical solution that each embodiment of the application provides is described in detail.
Fig. 1 is a kind of portable digital table characteristic measuring device structure diagram provided by the embodiments of the present application.Including letter
Number source 1, array switch 2, output port 3, input characteristics measuring circuit 4 and anti-jumming measuring circuit 5.The signal source includes the
One signal source CH1 and second signal source CH2.The array switch includes first switch K1 to the 12nd and switchs K12.The output
Port 3 includes high port H, low port L, ground protection port G and grounding ports E.
It should be noted that input characteristics measuring circuit 4 and anti-jumming measuring circuit 5, are the cores tested, pass through
Switch arrays are controlled, complete the measurement to each functional circuit of digital table.In measurement process, by array switch according to test need
It asks, switchs or be closed different switch combinations, form different function measuring circuit, and apply alternating current-direct current signal.It is special when carrying out input
Property measure when, direct current signal is applied to measured number table；When carrying out noiseproof feature measurement, by two-way alternating current-direct current signal point
It is not applied to measured number table.
Preferably, controllable two-way alternating current-direct current signal source is selected in signal source part.For example, the domestic two-way low frequency of gwinstek company
Signal source no matter in combined-voltage stability and precision or in size, can meet as internal attachment standard
Requirement.
It should be noted that two-way alternating current-direct current signal source is respectively CH1 and CH2.In input characteristics functional test, use
CH2 roads provide steady dc voltage, carry out input impedance and the measurement of zero current.When noiseproof feature measures, with CH1 roads
Stable direct current signal is exported, applies interference signal with CH2 roads, to measure the noiseproof feature of digital table, that is, goes here and there mould and common mode
Jamming performance.The two-way of signal source is completely isolated individual passage, in source between do not interfere with each other.
Preferably, the array switch is using 12 road relay array switches.It is main to complete to hand over input characteristics and anti-interference
The conversion of characteristic difference circuit function.
It is further preferred that relay array switch in 12 road is solid-state relay array switch.It is program-controlled in order to improve
The measurement range of switch selects the solid-state relay of fast high reliability, switching speed, impact resistance, strong antijamming capability, using one
Road relay controls the structure of signal all the way, improves the safety of system.
It should be noted that being docked to realize with the complete of measured number voltmeter, setting 4 is defeated on device panel
Exit port, i.e. high port H, low port L, ground protection port G and grounding ports E.During work, output port 3 and measurand
The respective input mouth of word table is directly connected to, without thread-changing when test, it is possible to complete the automatic measurement of each function.
Portable digital table measuring device provided in this embodiment, by being designed and measured number voltage on device panel
Table input port solves the problems, such as that existing lean on builds route survey temporarily, shortens time of measuring, improve to corresponding port
Measurement efficiency, while avoid human error；Using automatic measurement mode, switched using different accesses, by input characteristics and resisted
Interference characteristic measuring device is combined into one, and realizes that different function measures, small, light-weight, be easy to portable.
Fig. 2 is portable digital table characteristic measuring device input characteristics measuring circuit schematic diagram.
Input characteristics measurement refers to the input impedance and null-current measurement of digital table.For digital table, input impedance
Digital table is typically referred under DC voltage measurement working condition, the equivalent resistance for the input circuit entered in terms of input terminal, it
It is represented with the ratio between variable quantity of the variable quantity of input voltage and corresponding input current.Zero current refers to as caused by inside digital table
, a kind of equivalent current flowed in or out in input circuit, current value is unrelated with applied signal voltage size, though
When input voltage is zero, this electric current remains on presence.
When S1, S2 are in lower column position, the different indicated numbers of checklist are read respectively：
Sl is placed in a, when S2 is placed in c, indicated value Uac
Sl is placed in a, when S2 is placed in d, indicated value Uad
Sl is placed in b, when S2 is placed in c, indicated value Ubc
Sl is placed in b, when S2 is placed in d, indicated value Ubd
According to above-mentioned reading, input impedance and the zero current of checklist can be calculated by formula (1)~(4).
Δ U=Ubd-Uad (2)
In formula：
Ri--- digital table input impedance；
I0--- zero current.
In the present embodiment, DC power supply E is replaced to carry out input characteristics with the CH2 of signal source 1 d. c. voltage signals exported
Measurement.
Fig. 3 is portable digital table characteristic measuring device series mode interference measuring circuit schematic diagram.
Noiseproof feature refers to the anti-string of digital table, common mode interference ability.It is done with normal mode rejection ratio (NMRR) SMRR and common mode
Inhibition is disturbed than CMRR to represent.
In series mode interference design circuit measuring, with the CH1 of signal source 1 replace DC power supply E to digital top application add it is to be measured directly
Galvanic electricity pressure, with the CH2 output interference alternating voltages of signal source 1.Normal mode rejection ratio (NMRR) SMRR is calculated by formula (5)：
In formula：
Usm--- added AC influence voltage peak；
ΔUsm--- digital voltmeter voltage change.
Fig. 4 is portable digital table characteristic measuring device common mode interference measuring circuit schematic diagram.
Common mode interference refers to that a voltage is added to caused interference on two input terminals of height of digital multimeter simultaneously.Altogether
Mould interference point exchange common mode interference and DC common-mode interference, wherein Fig. 4 left figures show exchange common mode interference test philosophy figure, figure
4 right figures show DC common-mode disturbed test schematic diagram.
In design, DC power supply E is replaced to add DC voltage to be measured to digital top application with the CH1 of signal source 1, with friendship signal source
1 CH2 outputs interference alternating voltage or DC voltage E2.So to direct current with exchange common-mode interference rejection ratio by formula (6)~(7)
It calculates：
In formula：
UDC--- added interference voltages value；
Ucm--- added AC influence voltage peak；
ΔUcm--- digital voltmeter voltage change.
Fig. 5 is the portable digital table characteristic measuring device schematic diagram that Fig. 1 is provided.Including signal source 1, array switch 2, member
Device portions and output port 3, the signal source 1 include the first signal source CH1 and second signal source CH2, the array switch
K12 is switched including first switch K1 to the 12nd, the component group includes first resistor R1, second resistance R2 and capacitance C1,
The output port 3 includes high port H, low port L, ground protection port G and grounding ports E；The second signal source CH2,
First switch K1, second switch K2, third switch K3, the 4th switch K4, the 5th switch K5, the 9th switch K9 and first resistor R1
Form input characteristics measuring circuit；The first signal source CH1, second signal source CH2, the 6th switch K6, the 7th switch K7, the
Eight switch K8, the 9th switch K9, the tenth switch K10, the 11st switch K11, the 12nd switch K12, second resistance R2 and capacitance
Form anti-jumming measuring circuit；The first signal source CH1 anodes switch respectively with the 6th switch K6 second ports, the 12nd
K12 first ports connect, the first signal source CH1 cathode respectively with first switch K1 second ports, second switch K2 first
Port, the 11st switch K11 first port connections；The second signal source CH2 first ports respectively with first switch K1 first
Port, the 7th switch K7 first port connections, the second signal source CH2 second ports switch K3 first ends with third respectively
Mouth, the 9th switch K9 first ports, the tenth switch K10 first port connections；The second switch K2 second ports respectively with institute
State first resistor R1 first ports, third switch K3 second ports, the 5th switch K5 first port connections；The 4th switch K4
First port is connect respectively with the first resistor R1 second ports, the 4th switch K4 second ports and the 5th switch K5 the
Two-port netwerk, the 6th switch K6 first ports, the high port H connections；The 7th switch K7 second ports are respectively with described the
Two resistance R2 first ports, the ground protection port G connections；The 8th switch K8 first ports are electric with described second respectively
The connection of R2 second ports is hindered, the 8th switch K8 second ports are connect respectively with the 9th switch K9 second ports, low port L；
The tenth switch K10 second ports are connect with grounding ports E；The 11st switch K11 second ports and capacitance first end
Mouth connection；The 12nd switch K12 second ports are connect with capacitance second port.
The different switch combination of open or close can form digital table input characteristics and the two different surveys of noiseproof feature
Measure circuit.
The second signal source CH2, first switch K1, second switch K2, third switch K3, the 4th switch K4, the 5th open
Close K5, the 9th switch K9 and first resistor R1 composition input characteristics measuring circuit 4.Open or close first switch K1, second open
K2, third switch K3, the 4th switch K4, the 5th switch K5 and the 9th switch K9 are closed, connecting second signal source CH2 can complete to input
Feature measurement.
It should be noted that when K1, K2, K4, K9 switch are closed, rest switch is opened, by the straight of CH2 outputs 1V or 10V
(the digital table input characteristics having is optimal in the measurement of 1V ranges, and the digital table input characteristics having measures most in 10V ranges for galvanic electricity pressure
It is excellent), the voltage U being equivalent in Fig. 2bdState；It is closed when K3, K4, K9 are switched, rest switch is opened, the voltage being equivalent in Fig. 2
UadState；It is closed when K1, K2, K5, K9 are switched, rest switch is opened, the voltage U being equivalent in Fig. 2bcState；As K3, K5, K9
Switch is closed, and rest switch is opened, the voltage U being equivalent in Fig. 2acState.By the switching of various states, according to formula (2),
(3) it realizes the acquisition of Δ U and Δ I, input impedance R is completed by calculating according to formula (1), (4)iWith zero current I0Measurement.
Preferably, R1 values 10M Ω select metalfilmresistor.R1 is sample resistance, for measuring the electricity on zero current
Pressure.R1 values are too small, and sampling voltage variation is too small, and as a result inaccurate, R1 values are too big, and the interference of introduction is larger, and stability is poor, therefore
R1 value 10M Ω, resistance select accurate metalfilmresistor, and temperature coefficient very little, stability is high, can meet the need of measurement
It will.
The first signal source CH1, second signal source CH2, the 6th switch K6, the 7th switch K7, the 8th switch K8, the 9th
Switch K9, the tenth switch K10, the 11st switch K11, the 12nd switch K12, second resistance R2 and capacitance composition noiseproof feature
Measuring circuit 5.Open or close the 6th switch K6, the 7th switch K7, the 8th switch K8, the 9th switch K9, the tenth switch K10,
11st switch K11, the 12nd switch K12, input characteristics survey can be completed by connecting the first signal source CH1 and second signal source CH2
Amount.
It should be noted that when first, six, nine, 11,12 switches (K1, K6, K9, K11, K12) are closed, remaining is opened
It closes and opens, be equivalent to Fig. 3 series mode interference measuring circuit schematic diagrams.By CH1 outputs close to tested voltmeter minimum voltage amount
The DC voltage of journey 70% or so, by CH2 export AC influence voltage, frequency be (50 ± 1Hz) or be (50 ± 2Hz) or
Person is consistent with measured number table specification assigned frequency.Normal mode rejection ratio (NMRR) is calculated by formula (5).C is the mica of 1 μ F
Capacitance, effect is that the alternating voltage on CH2 is avoided to be added in the direct voltage source internal resistance of CH1 to damage.
When first, six, seven, eight, ten switches (K1, K6, K7, K8, K10) are closed, rest switch is opened, and is equivalent to Fig. 4 and is total to
Mould interference measurement circuit diagram.DC voltage close to tested voltmeter minimum voltage range 70% or so is exported by CH1,
AC and DC interference voltage is exported by CH2, alternating voltage its frequency for 50Hz or with measured number table specification assigned frequency
It is consistent.Common-mode interference rejection ratio is calculated by formula (6), (7).Second resistance R2 is unbalanced resistance, by regulation value 1k
Ω, it is similary to select accurate metalfilmresistor.
Fig. 6 is another portable digital table characteristic measuring device structure diagram provided by the embodiments of the present application.This reality
Example is applied in addition to including component shown in FIG. 1, further includes control unit 6 and driving circuit 7.Described control unit 6 includes instruction and controls
Unit 61 processed and array switch control unit 62.The driving circuit is used to amplify the switch control signal.
Described instruction control unit 61 for sending switching control instruction and signal source control instruction, while is acquired and is divided
Measurement data is analysed, generates measurement result.
Preferably, described instruction control unit is embedded Industrial touch screen tablet computer.
The industrial touch screen type tablet computer of technology maturation is small, easy to operate convenient for being embedded in industry control cabinet, fits
It shares in the program-controlled of portable equipment.In addition to this, also can be selected prepackage test software other usually portable movement is set
It is standby, for example mobile phone is as control unit.
In addition to switching control instruction is sent out, also operable test software sends out and connects to the first signal source and second signal source
The control signal that on-off is opened.Meanwhile the voltage and current test data of feedback is received, carry out data analysis calculating, display characteristic
Measurement result.
The array switch control unit 62 for receiving the switching control instruction, generates switch control signal.
Preferably, the array switch control unit 62 uses 24 railway digital I/O cards.Array switch control unit 62 is to be
Measured number table and the bridge of test equipment conversion connection in system.During test, sent out by instruction control unit to 24 railway digital I/O cards
Control signal is sent, digital I/O cards instruct output 5V high level or 0V low levels to go that each road relay is controlled to open according to what is received
The break-make of pass forms different switching channels.
Make the actuating of relay first during control, the high and low end switch access realized by the actuation of relay
It is closed.After switch connection, add corresponding test signal and interference signal to measured number top application.
For example, during test series mode interference characteristic, first, sent by array switch control unit 62 to 24 railway digital I/O cards
First switch K1, the 6th switch K6, the 9th switch K9, the 11st switch K11 and the 12nd switch K12 are closed, and rest switch is beaten
The control signal opened, then 24 railway digital I/O cards are to first switch K1, the 6th switch K6, the 9th switch K9, the 11st switch
The switch K12 output 5V high level of K11 and the 12nd, drives corresponding switch relay to be attracted, and forms access, rest switch output 0V
Low level forms open circuit, finally d. c. voltage signal is sent out from instruction control unit 61 to the first signal source CH1, to second signal
Source CH2 sends out ac voltage signal, data needed for acquisition, then is calculated by instruction control unit 61, obtains measured number table
Series mode interference feature measurement result.
Further, the 24 railway digital I/O cards are USB interface.USB interface is common interfaces, compatible major part day
Chang Suoyong control unit interfaces are conducive to enhance the compatibility of test device.
Preferably, the driving circuit is in a manner that optocoupler and triode combine driving.Relay drive circuit passes through
Transistor amplifier promotes the driving force of digital signal.Since I/O card output signals are Transistor-Transistor Logic level signals, can provide
Driving current is smaller, to improve its driving force, ensures its job stability, needs to increase among I/O cards and relay
Driving circuit.In view of the electromagnetic compatibility and reliability of system, triode drive is connect using optocoupler in the driving circuit of relay
Dynamic mode drives relay.The designing scheme of driving relay is combined with triode using optocoupler, both realizes test system
The electrical isolation of system and electronic execution part, and improve the driving force of digital signal and the antijamming capability of system.
The embodiment of the present application is designed with measured number voltmeter input port on device panel to corresponding port, solution
It is certainly existing to lean on interim the problem of building route survey, time of measuring is shortened, improves measurement efficiency, while avoids artificial mistake
Difference；Using automatic measurement mode, switched using different accesses, input characteristics and noiseproof feature measuring device be combined into one,
Realize that different function measures, it is small, light-weight, be easy to portable；After first connecting by the way of plus signal, measurement system ensure that
The electrical security of system.
The foregoing is merely embodiments herein, are not limited to the application.For those skilled in the art
For, the application can have various modifications and variations.All any modifications made within spirit herein and principle are equal
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (10)
1. a kind of portable digital table characteristic measuring device, which is characterized in that including signal source, array switch, component part
And output port, the signal source include the first signal source and second signal source, the array switch includes first switch to the
12 switches, the component group include first resistor, second resistance and capacitance, and the output port includes high port, low side
Mouth, ground protection port and grounding ports；
The second signal source, first switch, second switch, third switch, the 4th switch, the 5th switch, the 9th switch and the
One resistance forms input characteristics measuring circuit；
First signal source, second signal source, the 6th switch, the 7th switch, the 8th switch, the 9th switch, the tenth switch, the
11 switches, the 12nd switch, second resistance and capacitance composition noiseproof feature measuring circuit；
The first signal source anode is connect respectively with the 6th switch second port, the 12nd switch first port, and described first
Signal source cathode is connect respectively with first switch second port, second switch first port, the 11st switch first port；
Second signal source first port is connect respectively with first switch first port, the 7th switch first port, and described the
Binary signal source second port is connect respectively with third switch first port, the 9th switch first port, the tenth switch first port；
The second switch second port switchs respectively with the first resistor first port, third switch second port, the 5th
First port connects；
It is described 4th switch first port connect respectively with the first resistor second port, it is described 4th switch second port and
5th switch second port, the 6th switch first port, high port connection；
The 7th switch second port is connect respectively with the second resistance first port, the ground protection port；
The 8th switch first port is connect respectively with the second resistance second port, the 8th switch second port point
It is not connect with the 9th switch second port, low port；
The tenth switch second port is connect with grounding ports；
The 11st switch second port is connect with capacitance first port；
The 12nd switch second port is connect with capacitance second port.
2. portable digital table characteristic measuring device as described in claim 1, which is characterized in that control unit is further included, it is described
Control unit includes instruction control unit and array switch control unit；
Described instruction control unit for sending switching control instruction and signal source control instruction, while is acquired and is analyzed and measure
Data generate measurement result；
The array switch control unit for receiving the switching control instruction, generates switch control signal.
3. portable digital table characteristic measuring device as described in claim 1, which is characterized in that the array switch uses 12 tunnels
Relay array switchs.
4. portable digital table characteristic measuring device as claimed in claim 2, which is characterized in that the array switch control unit
Using 24 railway digital I/O cards.
5. portable digital table characteristic measuring device as claimed in claim 2, which is characterized in that described instruction control unit is interior
Embedded Industrial touch screen tablet computer.
6. portable digital table characteristic measuring device as claimed in claim 2, which is characterized in that driving circuit is further included, it is described
Driving circuit is used to amplify the switch control signal.
7. portable digital table characteristic measuring device as described in claim 1, which is characterized in that the signal source is controllable two-way
Alternating current-direct current signal source.
8. portable digital table characteristic measuring device as claimed in claim 2, which is characterized in that the 24 railway digital I/O cards are
USB interface.
9. portable digital table characteristic measuring device as claimed in claim 3, which is characterized in that 12 road relay array is opened
It closes as solid-state relay array switch.
10. portable digital table characteristic measuring device as claimed in claim 6, which is characterized in that the driving circuit uses light
Coupling and triode combine the mode of driving.
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| CN201711184436.0A CN108152776A (en) | 2017-11-23 | 2017-11-23 | A kind of portable digital table characteristic measuring device |
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| CN201711184436.0A CN108152776A (en) | 2017-11-23 | 2017-11-23 | A kind of portable digital table characteristic measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471047A (en) * | 2018-12-21 | 2019-03-15 | 北京无线电计量测试研究所 | A kind of Portable Automatic measuring device for alterating and direct current source calibration |
| CN115328006A (en) * | 2022-10-13 | 2022-11-11 | 苏州华兴源创科技股份有限公司 | Signal control circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501257B1 (en) * | 1995-11-30 | 2002-12-31 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| CN101995519A (en) * | 2010-11-01 | 2011-03-30 | 天水华天微电子股份有限公司 | Device and method for testing common-mode input impedance of operation amplifier |
| CN102279377A (en) * | 2011-07-05 | 2011-12-14 | 江苏东方航天校准检测有限公司 | Measuring device and method for input characteristics of active direct current voltage measuring circuit or instrument |
| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN205333845U (en) * | 2016-01-28 | 2016-06-22 | 漳州科能电器有限公司 | Online error testing arrangement of electric energy meter |
-
2017
- 2017-11-23 CN CN201711184436.0A patent/CN108152776A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501257B1 (en) * | 1995-11-30 | 2002-12-31 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| CN101995519A (en) * | 2010-11-01 | 2011-03-30 | 天水华天微电子股份有限公司 | Device and method for testing common-mode input impedance of operation amplifier |
| CN102279377A (en) * | 2011-07-05 | 2011-12-14 | 江苏东方航天校准检测有限公司 | Measuring device and method for input characteristics of active direct current voltage measuring circuit or instrument |
| CN102608450A (en) * | 2012-02-24 | 2012-07-25 | 江苏凌创电气自动化股份有限公司 | Testing and verifying system appropriate for intelligent transformer substation and verifying method |
| CN205333845U (en) * | 2016-01-28 | 2016-06-22 | 漳州科能电器有限公司 | Online error testing arrangement of electric energy meter |
Non-Patent Citations (3)
| Title |
|---|
| 潘再评: "《电力电子技术与电机控制 实验教程》", 31 March 2000 * |
| 许兴明 等: "数字多用表抗干扰能力自动测试装置的设计", 《电子测量技术》 * |
| 陶时澍: "《电气测量技术》", 31 March 1991 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471047A (en) * | 2018-12-21 | 2019-03-15 | 北京无线电计量测试研究所 | A kind of Portable Automatic measuring device for alterating and direct current source calibration |
| CN109471047B (en) * | 2018-12-21 | 2021-04-02 | 北京无线电计量测试研究所 | Portable automatic measuring device for AC/DC power supply calibration |
| CN115328006A (en) * | 2022-10-13 | 2022-11-11 | 苏州华兴源创科技股份有限公司 | Signal control circuit |
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