CN102466788B - Universal meter calibration source - Google Patents
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- CN102466788B CN102466788B CN201010534866.2A CN201010534866A CN102466788B CN 102466788 B CN102466788 B CN 102466788B CN 201010534866 A CN201010534866 A CN 201010534866A CN 102466788 B CN102466788 B CN 102466788B
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Abstract
The present invention provides a kind of Universal meter calibration source, including a circuit board (21), four electric connecting terminals (22), (23), (24), (25), one for calibrating the first calibration circuit (26) of circuit tester, one for calibrating the second calibration circuit (27) of circuit tester, four electric connecting terminals (22), (23), (24), (25) square distribution, it is fixedly mounted on circuit board (21), first calibration circuit (26) is connected between electric connecting terminal (22) and electric connecting terminal (23), second calibration circuit (27) is connected between electric connecting terminal (23) and electric connecting terminal (24).It is big that the Universal meter calibration source of the present invention solves prior art calibration source volume, the technical problem of the most portable and inconvenient use, provide a kind of compact, the Universal meter calibration source being convenient for carrying, when testing desk-top four terminal circuit tester, the Universal meter calibration source of the present invention can realize i.e. inserting and i.e. survey, very easy to use.
Description
Technical field
The present invention relates to electric variable field tests, refer more particularly in electric variable is tested, the calibration of electric measuring instrument.
Background technology
In prior art, Universal meter calibration source generally comprises standard transducer or the circuit of analog sensor characteristic of the sensor function for checking circuit tester；Short-circuiting device for the zero migration of the zero migration and resistance measurement function of checking the voltage measurement function of circuit tester；For checking the standard capacitance of the capacitance measurement function of circuit tester；For checking the normal voltage of the voltage measurement function of circuit tester；For checking the measuring resistance of the resistance measurement function of circuit tester.
With reference to Fig. 1, prior art Universal meter calibration source 1 includes sensor L1, short-circuiting device D1, standard capacitance C1, normal voltage V1, measuring resistance R1, and power supply circuits G1.Calibration source 1 selects to switch described sensor L1, short-circuiting device D1, standard capacitance C1, normal voltage V1 and measuring resistance R1 by variable connector S1, alternating current power supply terminates into calibration source 1 by E end and F, and alternating current power supply input is converted into galvanic current pressure and powers to normal voltage V1 by power supply circuits G1.Calibration source 1 includes four lead-out terminals A, B, C, D, when using calibration source 1, the lead-out terminal A of calibration source 1 is with being connected with tested circuit tester input terminal HI, the lead-out terminal B of calibration source 1 is connected with tested circuit tester input terminal LO, the lead-out terminal C of calibration source 1 is connected with tested circuit tester input terminal LOsens, and the lead-out terminal D of calibration source 1 is connected with tested circuit tester input terminal HIsens.
When checking the sensor function of circuit tester, variable connector S1 is switched to terminal 5 position, sensor L1 is connected between input terminal HI and LO of circuit tester, sensor signal is entered inside circuit tester by HI and LO terminal, and output and the circuit tester sensor measurement reading of the sensor L1 in comparison calibration source 1 can differentiate that circuit tester sensor measurement is the most accurate.Such as, the output of the sensor L1 of calibration source 1 is 1.000000V voltage, circuit tester reading is 1.000030V voltage, now the allowable error of 1V signal measured by circuit tester is ± 0.000035V, then explanation circuit tester accuracy is in the range of allowable error, above-mentioned comparing result can be used to judge whether circuit tester exceeds allowable error scope, if it does, can according to circumstances recalibrate or keep in repair.
During the zero migration of the zero migration of voltage measurement function of inspection circuit tester and resistance measurement function, variable connector S1 is switched to terminal 4 position, and short-circuiting device D1 is connected between input terminal HI and LO of circuit tester.At this moment, circuit tester HI and LO two ends are shorted, and the voltage being input to circuit tester HI and LO terminal two ends is zero, and the resistance at HI and LO terminal two ends is zero.The big I observing circuit tester reading deviation " zero " reading differentiates that circuit tester zero migration is the most accurate.
When checking the capacitance measurement function of circuit tester, variable connector S1 is switched to terminal 3 position, and standard capacitance C1 is connected between input terminal HI and LO of circuit tester.The size of standard capacitance C1 in comparison calibration source 1 and circuit tester voltage readings can differentiate that circuit tester capacitance measurement is the most accurate.
When checking the voltage measurement function of circuit tester, variable connector S1 is switched to terminal 2 position, normal voltage V1 is input to input terminal HI and LO of circuit tester, and the size of normal voltage V1 in comparison calibration source 1 and circuit tester voltage readings can differentiate that circuit tester voltage measurement is the most accurate.
When checking the two wires resistance measurement function of circuit tester, variable connector S1 is switched to terminal 1 position, and measuring resistance R1 is connected between input terminal HI and LO of circuit tester.Size and the circuit tester resistance measurement reading of measuring resistance R1 in comparison calibration source 1 can differentiate that the resistance measurement of circuit tester two wires is the most accurate.
When the four-wire ohm of inspection circuit tester measures function, variable connector S1 is switched to terminal 1 position, and measuring resistance R1 current input terminal connects with input terminal HI and LO of circuit tester；Measuring resistance R1 sensing end connects with sensing input terminal HIsens and LOsens of circuit tester.It is the most accurate that the size of measuring resistance R1 in comparison calibration source 1 and circuit tester resistance measurement reading can differentiate that circuit tester four-wire ohm is measured.
The normal component that the measuring resistance of prior art calibration source 1, standard capacitance, normal voltage, short-circuiting device and sensor are typically chosen in rated temperature range and in time rating, accuracy is better than tested instrument accuracy grade 3 times.Measuring resistance used, standard capacitance are not necessarily resistor or capacitor, can also be the resistance of equivalence, capacitive circuit, short-circuiting device is usually the wire of low thermoelectrical potential and contact resistance, and sensor can be that the sensor of standard specifications is in kind or have the circuit of Sensor Output Characteristic.
At present, when circuit tester uses the performance of on-the-spot test circuit tester, it is often necessary to a kind of calibration source being easy to carry and conveniently use.And prior art calibration source uses alternating current power supply to power to internal preferred circuit, typically all including transformator, rectification, filtering and mu balanced circuit in power supply circuits, circuit structure is complicated, and volume is big, and use alternating current power supply to power, it has not been convenient to use in field etc. lacks the environment of alternating current power supply.And when using calibration source, calibration source and circuit tester need to be connected with wire, not only operate complexity, and the requirement to wire is higher, too high conductor resistance can cause calibration error.
Summary of the invention
Present invention solves the technical problem that and be, overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of calibration source being easy to carry and conveniently use.
Solving above-mentioned technical problem, the present invention provides a kind of Universal meter calibration source, including a circuit board, four electric connecting terminals, one for calibrate the first calibration circuit of circuit tester, one for calibrating the second calibration circuit of circuit tester,
Described four square distributions of electric connecting terminal, are fixedly mounted on described circuit board,
Described first calibration is electrically connected between a pair electric connecting terminal,
Described second calibration be electrically connected to another to electric connecting terminal between, described first calibration circuit and described second calibration circuit the most at least include a device in standard capacitance, measuring resistance, standard voltage source, short-circuiting device, sensor.
Described four electric connecting terminals are made up of four banana plugs respectively, described four square distributions of banana plug, are fixedly mounted on the same side of circuit board.
Also have between a pair electric connecting terminal to connect and have one for the 3rd calibration circuit calibrating circuit tester.
Described first calibration circuit includes a standard capacitance, a binding post and a hand switch, described standard capacitance is connected between a pair described electric connecting terminal, first connected state of described hand switch makes one end of described binding post connect in the pair of electric connecting terminal, another end making described binding post connects another in the pair of electric connecting terminal, second connected state of described hand switch makes a standard voltage source in parallel with described standard capacitance, and the 3rd connected state of described hand switch is unsettled state.
Described second calibration circuit can be a short-circuiting device, and described 3rd calibration circuit can be a measuring resistance.
Described standard voltage source includes a voltage reference chip, one normal voltage outfan of described voltage reference chip is connected to one end of described standard capacitance by described hand switch, the negative power end of described voltage reference chip is connected to the other end of described standard capacitance by described hand switch, and described voltage reference chip is powered by a battery.
Described circuit board includes upper circuit board equivalently-sized, interfix installation by up-down structure and lower circuit board, described four banana plugs are arranged on the lateral surface of described lower circuit board, described short-circuiting device, described measuring resistance, described standard capacitance, described hand switch is placed in the medial surface of described lower circuit board, described battery, described binding post are arranged on the lateral surface of described upper circuit board, described upper circuit board and described lower circuit board and realize electrical connection by one group of connector.
Described upper circuit board and lower circuit board are equivalently-sized foursquare circuit board, and corner has the installing hole described in installing hole, described upper circuit board and the utilization of lower circuit board and securing member to be mutually permanently connected.
Described four banana plugs are made up of the first banana plug, the second banana plug, the 3rd banana plug and the 4th banana plug, described first banana plug, the second banana plug, the 3rd banana plug and the 4th banana plug are sequentially arranged on 4 angles of the lateral surface being arranged on described lower circuit board, and described first calibration is electrically connected between the first banana plug and the second banana plug, described second calibration is electrically connected between the 3rd banana plug and the 4th banana plug, described 3rd calibration is electrically connected between the second banana plug and the 3rd banana plug.
The spacing of the described banana plug that each two is adjacent is a numerical value between 18mm-20mm.
It is big that the Universal meter calibration source of the present invention solves prior art calibration source volume, the technical problem of the most portable and inconvenient use, provide a kind of compact, the Universal meter calibration source being convenient for carrying, when testing desk-top four terminal circuit tester, the Universal meter calibration source of the present invention can realize i.e. inserting and i.e. survey, very easy to use.
Accompanying drawing explanation
Fig. 1 is the structure explanatory diagram of prior art Universal meter calibration source 1
Fig. 2 is the structure explanatory diagram of the Universal meter calibration source 2 of one embodiment of the invention
Fig. 3 is the side view of the Universal meter calibration source 2 of one embodiment of the invention
Fig. 4 is the structure explanatory diagram of the Universal meter calibration source 3 of one embodiment of the invention
Fig. 5 is the structure explanatory diagram of the Universal meter calibration source 4 of one embodiment of the invention
Fig. 6 is the structure explanatory diagram of the standard voltage source 29 of one embodiment of the invention
Fig. 7 is the structure explanatory diagram of the Universal meter calibration source 5 of one embodiment of the invention
Fig. 8 is the rearview of the Universal meter calibration source 5 of one embodiment of the invention
Detailed description of the invention
Below with reference to the accompanying drawings the preferred embodiment of the present invention is described in detail.
With reference to Fig. 2, the Universal meter calibration source 2 of embodiment includes 21, four electric connecting terminals 22,23,24 of a circuit board, 25, one for calibrating the first 26, one, circuit of calibration of circuit tester for calibrating the second calibration circuit 27 of circuit tester, four electric connecting terminals 22,23,24, on 25 four summits being distributed in square Z, it is fixedly mounted on circuit board 21, first calibration circuit 26 is connected between electric connecting terminal 22 and electric connecting terminal 23, and the second calibration circuit 27 is connected between electric connecting terminal 23 and electric connecting terminal 24.
With reference to Fig. 3, four electric connecting terminals 22,23,24,25 are respectively by four banana plugs 22C, 23C, 24C, and 25C is constituted, four banana plugs 22C, 23C, 24C, 25C, are fixedly mounted on the same side S of circuit board 21.
As an example, four electric connecting terminals 22,23,24,25 can also be with the usual plug of other form, as long as ensure to insert belt circuit tester four terminal, contact is good, and contact resistance is little the most permissible.
With reference to Fig. 4, connect between electric connecting terminal 24 and electric connecting terminal 25 and have one for the 3rd calibration circuit 28 calibrating circuit tester.
As an example, can also be that the first calibration circuit 26 is connected between electric connecting terminal 22 and electric connecting terminal 23, second calibration circuit 27 is connected between electric connecting terminal 22 and electric connecting terminal 25, and the 3rd calibration circuit 28 is connected between electric connecting terminal 24 and electric connecting terminal 25.
As an example, can also be that the first calibration circuit 26 is connected between electric connecting terminal 22 and electric connecting terminal 23, second calibration circuit 27 is connected between electric connecting terminal 24 and electric connecting terminal 25, and the 3rd calibration circuit 28 is connected between electric connecting terminal 23 and electric connecting terminal 24.
As an example, can also be that the first calibration circuit 26 is connected between electric connecting terminal 22 and electric connecting terminal 23, second calibration circuit 27 is connected between electric connecting terminal 24 and electric connecting terminal 25, and the 3rd calibration circuit 28 is connected between electric connecting terminal 22 and electric connecting terminal 25.
As an example, can also be that the first calibration circuit 26 is connected between electric connecting terminal 22 and electric connecting terminal 25, second calibration circuit 27 is connected between electric connecting terminal 24 and electric connecting terminal 25, and the 3rd calibration circuit 28 is connected between electric connecting terminal 22 and electric connecting terminal 23.
As an example, can also be that the first calibration circuit 26 is connected between electric connecting terminal 23 and electric connecting terminal 24, second calibration circuit 27 is connected between electric connecting terminal 24 and electric connecting terminal 25, and the 3rd calibration circuit 28 is connected between electric connecting terminal 22 and electric connecting terminal 23.
With reference to Fig. 5, first calibration circuit 26 includes 261, binding post 262 of a standard capacitance and a hand switch 263, standard capacitance 261 is connected between electric connecting terminal 22 and electric connecting terminal 23, in the present embodiment, standard capacitance 261 selects accuracy in rated temperature range to be better than the precision capacitance of tested circuit tester accuracy 3 times.
As an example, different types of electric capacity can be selected according to the difference of precision.
As an example, the first calibration circuit 26, second calibrate circuit 27 and the 3rd calibration circuit 28 can also all selection standard electric capacity, capacitance can be different.
One temperature sensor of preferred embodiment of the present invention middle connecting terminal 262 grafting.
As an example, binding post 262 can also the sensor of grafting other standards specification.
As an example, the first calibration circuit 26, second calibrates circuit 27 and the 3rd calibration circuit 28 can also all select sensor, and sensor model number can be different.
What the hand switch 263 in the preferred embodiment of the present invention was selected is the double-point double-throw switch of band tri-state.
As an example, hand switch 263 can also select DPTT double-pole triple throw to switch.
Second calibration circuit 27 is a short-circuiting device, and the 3rd calibration circuit 28 is a measuring resistance.
In the present embodiment, short-circuiting device selects low thermoelectrical potential and the wire of low contact resistance.
As an example, different types of short-circuiting device can be selected according to the difference of precision.
In the present embodiment, measuring resistance selects accuracy in rated temperature range to be better than the precision resistance of tested circuit tester accuracy 3 times.
As an example, different types of resistance can be selected according to the difference of precision.
As an example, the first calibration circuit 26, second calibrates circuit 27 and the 3rd calibration circuit 28 can also all select short-circuiting device, and short-circuiting device type can be different.
As an example, the first calibration circuit 26, second calibrate circuit 27 and the 3rd calibration circuit 28 can also all selection standard resistance, resistance can be different.
With reference to Fig. 6 and Fig. 5, standard voltage source 29 includes a voltage reference chip 291, one normal voltage outfan 292 of voltage reference chip 291 is operated with manual switches 263 one end being connected to standard capacitance 261, the negative power end 293 of voltage reference chip 291 is operated with manual switches 263 other ends being connected to standard capacitance 261, and voltage reference chip 291 is powered by a battery 294.In order to export stable voltage, standard voltage source 29 can also include mu balanced circuit 295.
As an example, voltage reference chip 291 can select the one in MAX6325, MAX6350, ISL21009 or ADR421.
As an example, the first calibration circuit 26, second calibrate circuit 27 and the 3rd calibration circuit 28 can also all selection standard voltage sources, the magnitude of voltage of standard voltage source can be different.
nullWith reference to Fig. 7，Described circuit board includes equivalently-sized、Interfix the upper circuit board 211 and lower circuit board 212 installed by up-down structure，The length of side of upper circuit board 211 and lower circuit board 212 is all 3.9CM，Described four banana plugs are arranged on the lateral surface S1 of lower circuit board 212，Short-circuiting device 28 (not shown)、Measuring resistance 27 (not shown)、Standard capacitance 261 (not shown)，Hand switch 263 is placed in the medial surface S2 of lower circuit board 212，Operate for convenience，The gear 263S that manually dials of hand switch 263 stands on upper circuit board lateral surface S3 by a circular hole on upper circuit board 211，Battery 294、Binding post 262 is arranged on the lateral surface S3 of circuit board 211，Upper circuit board 211 and lower circuit board 212 realize electrical connection by one group of connector (not shown).
With reference to Fig. 8, described upper circuit board and lower circuit board are equivalently-sized foursquare circuit board, and corner has four installing holes 51,52,53,54, described upper circuit board and lower circuit board to utilize installing hole 51,52,53,54 and securing member be mutually permanently connected.With reference to Fig. 7, the securing member in the present embodiment refers to nut L1, stud L2, screw L3, and as an example, securing member can also use other usual connected modes such as plug-in type.
Described four banana plugs are by the first banana plug 22C (not shown), second banana plug 23C (not shown), 3rd banana plug 24C (not shown) and the 4th banana plug 25C (not shown) composition, first banana plug 22C, second banana plug 23C, 3rd banana plug 24C and the 4th banana plug 25C is sequentially arranged on 4 angles of the lateral surface S1 being arranged on described lower circuit board, first calibration circuit 26 is connected between the first banana plug 22C and the second banana plug 23C, second calibration circuit 27 is connected between the 3rd banana plug 24C and the 4th banana plug 25C, 3rd calibration circuit 28 is connected between the second banana plug 23C and the 3rd banana plug 24C.The spacing of the described banana plug that each two is adjacent is 19.05mm.Using this spacing is to utilize four banana plugs that circuit board inserts four lead-out terminals of existing desk-top four terminal circuit testers.Tolerance when making in view of spacing, the spacing of the banana plug that each two is adjacent can be a numerical value between 18mm-20mm.
As an example, when, in four lead-out terminals of desk-top four terminal circuit testers, when the spacing of terminals of adjacent changes, in aforementioned four banana plug, the spacing of adjacent header can also be changed accordingly.
Combine the double-layer circuit board layout shown in Fig. 7 with the circuit layout shown in Fig. 5 and combine the circuit tester shown in Fig. 1, as highly preferred embodiment of the invention, further illustrating the work process of the Universal meter calibration source of the preferred embodiment of the present invention:
When checking the sensor function of circuit tester, a sensor is accessed on the binding post 262 of multi-functional calibration source, the terminal 22 of multi-functional calibration source is inserted in the input terminal HI of circuit tester, the terminal 23 of multi-functional calibration source is inserted in the input terminal LO of circuit tester, the terminal 24 of multi-functional calibration source is inserted in the input terminal LOsens of circuit tester, and the terminal 25 of multi-functional calibration source is inserted in the input terminal HIsens of circuit tester.The upper slitter D1 of hand switch 263 is connected to one end S1 of binding post 262, the lower cutter D2 of hand switch 263 is connected to the other end S4 of binding post 262, it is connected in parallel on after sensor parallel standard capacitance 261 between input terminal HI and LO of circuit tester, sensor signal is entered inside circuit tester by input terminal HI and LO terminal, and the sensor output and the circuit tester sensor measurement reading that contrast multi-functional calibration source can differentiate that circuit tester sensor measurement is the most accurate.Under this state, standard capacitance 261 is for the filtering of sensor signal.
When checking the capacitive function of circuit tester, the terminal 22 of multi-functional calibration source is inserted in the input terminal HI of circuit tester, the terminal 23 of multi-functional calibration source is inserted in the input terminal LO of circuit tester, the terminal 24 of multi-functional calibration source is inserted in the input terminal LOsens of circuit tester, and the terminal 25 of multi-functional calibration source is inserted in the input terminal HIsens of circuit tester.The upper slitter D1 of hand switch 263 is connected to free end S2, and standard capacitance 261 is connected in parallel between input terminal HI and LO of circuit tester, with circuit tester voltage readings, the size of the standard capacitance 261 contrasting multi-functional calibration source can differentiate that circuit tester capacitance measurement is the most accurate.
When checking the voltage function of circuit tester, the terminal 22 of multi-functional calibration source is inserted in the input terminal HI of circuit tester, the terminal 23 of multi-functional calibration source is inserted in the input terminal LO of circuit tester, the terminal 24 of multi-functional calibration source is inserted in the input terminal LOsens of circuit tester, and the terminal 25 of multi-functional calibration source is inserted in the input terminal HIsens of circuit tester.The upper slitter D1 of hand switch 263 is connected to one end S3 of standard voltage source 29, the lower cutter D2 of hand switch 263 is connected to the other end S5 of standard voltage source 29, it is connected to after standard voltage source 29 is in parallel with standard capacitance 261 between circuit tester input terminal HI and LO, battery 294 is connected with the loop of mu balanced circuit simultaneously, mu balanced circuit is powered to standard voltage source 29, to circuit tester input terminal HI and LO, the normal voltage size and the circuit tester voltage readings that contrast the output of multi-functional calibration source, standard voltage source 29 output voltage can differentiate that circuit tester voltage measurement is the most accurate.Under this state, standard capacitance 261 filters for standard voltage signal.
During inspection two wires resistance function, the terminal 23 of multi-functional calibration source is inserted in the input terminal HI of circuit tester, the terminal 24 of multi-functional calibration source is inserted in the input terminal LO of circuit tester, the terminal 25 of multi-functional calibration source is inserted in the input terminal LOsens of circuit tester, and the terminal 22 of multi-functional calibration source is inserted in the input terminal HIsens of circuit tester.The upper slitter D1 of hand switch 263 is connected to free end S2, and the terminal 23 of multi-functional calibration source and the terminal 24 of multi-functional calibration source are connected with input terminal HI, LO of circuit tester respectively.The size and the circuit tester resistance measurement reading that contrast the measuring resistance 27 of multi-functional calibration source can differentiate that the resistance measurement of circuit tester two wires is the most accurate.Under this state, connection standard electric capacity 261 between input HI terminal and the HIsens terminal of circuit tester, do not have electric current under steady statue in standard capacitance 261 and flow through, so not interfering with the accuracy of two wires resistance measurement functional check.
During the zero migration of the zero migration of voltage measurement function of inspection circuit tester and resistance measurement function, the terminal 24 of multi-functional calibration source is inserted in circuit tester input terminal HI, the terminal 25 of multi-functional calibration source is inserted in the input terminal LO of circuit tester, the terminal 22 of multi-functional calibration source is inserted in the input terminal LOsens of circuit tester, and the terminal 23 of multi-functional calibration source is inserted in the input terminal HIsens of circuit tester.The D1 of hand switch 263 connects S2, and the terminal 24 of multi-functional calibration source and the terminal 25 of multi-functional calibration source are connected with input terminal HI, LO of circuit tester respectively.The big I observing circuit tester reading deviation " zero " reading differentiates that circuit tester zero migration is the most accurate.Connection standard resistance 27 between the input terminal HI and input terminal HIsens of circuit tester under this state, there may be electric current to flow through measuring resistance 27 and introduce error, but the dead resistance of short-circuiting device 28 is generally less than 10m Ω, and measuring resistance 27 generally 10k Ω, both difference is 106 times, therefore the error that measuring resistance 27 introduces can be ignored.
When checking circuit tester voltage measurement function and sensor function, standard voltage signal and sensor signal all have passed through hand switch 263, what the hand switch 263 in this preferred embodiment was selected is double-point double-throw switch, it is therefore desirable to consider the additive error that double-point double-throw switch introduces.During due to voltage measurement and sensor measurement, the most do not have electric current and flow through double-point double-throw switch, therefore contact resistance will not introduce error.In view of the symmetrical structure of double-point double-throw switch structure, for sensor circuit, the thermoelectrical potential error of two groups of switch introducings can cancel each other, thus eliminates the impact of thermoelectrical potential.The compactest in view of double-point double-throw switch structure, interior temperature distribution is uniform, and the thermoelectrical potential of introducing is the least, and for the variable connector used in prior art, double-point double-throw switch is easier to realize the switching of low thermoelectrical potential.In order to make additive error meet the requirement of High Precision Multimeter inspection, the variable connector in prior art calibration source needs highly reliable low contact resistance and low grade fever potential switch.It is typically the mechanical switch being especially tailored, accurate relay or electrical switch.The element of these types is not readily available, and general volume is relatively big, and cost is the highest, and application circuit is complicated.The most in the present invention, double-point double-throw switch switching is used can to reduce switching circuit volume, additive error little.
As an example, if the standard capacitance in the present invention 261 is not directly connected between two terminals of Universal meter calibration source, then need to use switching switch to select to access standard capacitance 261, so switching switch needs DPTT double-pole triple throw to switch, and three-way switch connects sensor, normal voltage and electric capacity respectively.And while standard capacitance 261 being directly connected between two terminals of Universal meter calibration source, use double-point double-throw switch, one group of switching switch can be saved, avoid standard capacitance 261 and introduced produced additive error by switching switch, the effect of filtering can be realized simultaneously with electric capacity.
In the present invention, short-circuiting device 28 and measuring resistance 27 are all directly connected with circuit tester input terminal, thus without the error introducing switching switch.
The present invention is by improving in combination with the improvement to Universal meter calibration source circuit board to Multimeter Calibration source circuit, simplify more convenient while circuit measurement, the position relationship of circuit tester input terminal is inserted by the Universal meter calibration source of the conversion embodiment of the present invention, enormously simplify function switching circuit, reduce the performance requirement to function switching switch, therefore ensureing that overall performance can reduce volume under conditions of constant, reduce cost, be convenient for carrying, battery-powered, use convenient.When testing desk-top four terminal circuit tester, the Universal meter calibration source of the present invention can realize i.e. inserting and i.e. survey, very easy to use.
Although being described in conjunction with the accompanying embodiments of the present invention, but those of ordinary skill in the art can make various changes and modifications within the scope of the appended claims.
Claims (10)
1. a desk-top Universal meter calibration source, it is characterised in that:
Including a circuit board, four electric connecting terminals, one for calibrate the first calibration circuit of circuit tester, one for calibrating the second calibration circuit of circuit tester,
Described four square distributions of electric connecting terminal, are fixedly mounted on described circuit board,
Described first calibration is electrically connected between first pair of electric connecting terminal,
Described second calibration is electrically connected between second pair of electric connecting terminal, and described first calibration circuit and described second calibration circuit the most at least include a device in standard capacitance, measuring resistance, standard voltage source, short-circuiting device, sensor.
Desk-top Universal meter calibration source the most according to claim 1, it is characterised in that: described four electric connecting terminals are made up of four banana plugs respectively, described four square distributions of banana plug, are fixedly mounted on the same side of circuit board.
Desk-top Universal meter calibration source the most according to claim 2, it is characterised in that: connect between the 3rd pair of electric connecting terminal and have one for the 3rd calibration circuit calibrating circuit tester.
Desk-top Universal meter calibration source the most according to claim 3, it is characterized in that: described first calibration circuit includes a standard capacitance, one binding post and a hand switch, described standard capacitance is connected between described first pair electric connecting terminal, first connected state of described hand switch makes one end of described binding post connect an electric connecting terminal in described first pair of electric connecting terminal, another end making described binding post connects another electric connecting terminal in described first pair of electric connecting terminal, second connected state of described hand switch makes a standard voltage source in parallel with described standard capacitance, 3rd connected state of described hand switch is unsettled state.
Desk-top Universal meter calibration source the most according to claim 4, it is characterised in that: described second calibration circuit is a short-circuiting device, and described 3rd calibration circuit is a measuring resistance.
Desk-top Universal meter calibration source the most according to claim 5, it is characterized in that: described standard voltage source includes a voltage reference chip, one normal voltage outfan of described voltage reference chip is connected to one end of described standard capacitance by described hand switch, the negative power end of described voltage reference chip is connected to the other end of described standard capacitance by described hand switch, and described voltage reference chip is powered by a battery.
Desk-top Universal meter calibration source the most according to claim 6, it is characterized in that: described circuit board includes upper circuit board equivalently-sized, interfix installation by up-down structure and lower circuit board, described four banana plugs are arranged on the lateral surface of described lower circuit board, described short-circuiting device, described measuring resistance, described standard capacitance, described hand switch is placed in the medial surface of described lower circuit board, described battery, described binding post are arranged on the lateral surface of described upper circuit board, described upper circuit board and described lower circuit board and realize electrical connection by one group of connector.
Desk-top Universal meter calibration source the most according to claim 7, it is characterized in that: described upper circuit board and lower circuit board are equivalently-sized foursquare circuit board, corner has the installing hole described in installing hole, described upper circuit board and the utilization of lower circuit board and securing member to be mutually permanently connected.
Desk-top Universal meter calibration source the most according to claim 8, it is characterized in that: described four banana plugs are by the first banana plug, second banana plug, 3rd banana plug and the 4th banana plug composition, described first banana plug, second banana plug, 3rd banana plug and the 4th banana plug are sequentially arranged on 4 angles of the lateral surface being arranged on described lower circuit board, described first calibration is electrically connected between the first banana plug and the second banana plug, described second calibration is electrically connected between the 3rd banana plug and the 4th banana plug, described 3rd calibration is electrically connected between the second banana plug and the 3rd banana plug.
10. according to the desk-top Universal meter calibration source described in claim 2,3,4,5,6,8 or 9, it is characterised in that the spacing of the described banana plug that each two is adjacent is a numerical value between 18mm-20mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010534866.2A CN102466788B (en) | 2010-11-03 | 2010-11-03 | Universal meter calibration source |
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| CN201010534866.2A CN102466788B (en) | 2010-11-03 | 2010-11-03 | Universal meter calibration source |
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| CN102466788B true CN102466788B (en) | 2016-08-03 |
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| CN104535951B (en) * | 2014-12-24 | 2017-07-07 | 北京航天测控技术有限公司 | A kind of digital table automatic detection device |
| CN107300681A (en) * | 2017-04-28 | 2017-10-27 | 中国人民解放军91550部队 | A kind of multi-channel measurement circuit design |
| CN107315152A (en) * | 2017-04-28 | 2017-11-03 | 中国人民解放军91550部队 | A kind of many Measurement channel built-in self-test circuit designs |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251143Y (en) * | 1996-07-08 | 1997-04-02 | 马福兴 | Portable universal field checker |
| US6429696B1 (en) * | 2000-02-08 | 2002-08-06 | Cheng-Yung Kao | Peak hold and calibration circuit |
| TW200817709A (en) * | 2006-10-11 | 2008-04-16 | Hon Hai Prec Ind Co Ltd | System and method for measuring digital multimeters automatically |
| EP1959267A1 (en) * | 2007-02-15 | 2008-08-20 | MAGNETI MARELLI SISTEMI ELETTRONICI S.p.A. | An automatic unit for verifying the calibration of a multimeter |
| CN201199264Y (en) * | 2008-04-24 | 2009-02-25 | 深圳市华仪仪器科技有限公司 | Multi purpose meter for checking process |
| TW201017200A (en) * | 2008-10-24 | 2010-05-01 | Hon Hai Prec Ind Co Ltd | System and method for verifying a multimeter |
| CN101713819A (en) * | 2008-10-08 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | System and method for checking universal meter |
-
2010
- 2010-11-03 CN CN201010534866.2A patent/CN102466788B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251143Y (en) * | 1996-07-08 | 1997-04-02 | 马福兴 | Portable universal field checker |
| US6429696B1 (en) * | 2000-02-08 | 2002-08-06 | Cheng-Yung Kao | Peak hold and calibration circuit |
| TW200817709A (en) * | 2006-10-11 | 2008-04-16 | Hon Hai Prec Ind Co Ltd | System and method for measuring digital multimeters automatically |
| EP1959267A1 (en) * | 2007-02-15 | 2008-08-20 | MAGNETI MARELLI SISTEMI ELETTRONICI S.p.A. | An automatic unit for verifying the calibration of a multimeter |
| CN201199264Y (en) * | 2008-04-24 | 2009-02-25 | 深圳市华仪仪器科技有限公司 | Multi purpose meter for checking process |
| CN101713819A (en) * | 2008-10-08 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | System and method for checking universal meter |
| TW201017200A (en) * | 2008-10-24 | 2010-05-01 | Hon Hai Prec Ind Co Ltd | System and method for verifying a multimeter |
Non-Patent Citations (2)
| Title |
|---|
| DO30系列三用表校验仪维修、改进;苏垂贵;《大众科技》;20091231(第08期);135 * |
| 基于Lab VIEW7.1的万用表校准系统的研究;魏小飞等;《上海计量测试》;20071231;16-18 * |
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| CN102466788A (en) | 2012-05-23 |
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