CN106771633A - Hand-held instrument for measuring DC resistance - Google Patents
Hand-held instrument for measuring DC resistance Download PDFInfo
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- CN106771633A CN106771633A CN201611264853.1A CN201611264853A CN106771633A CN 106771633 A CN106771633 A CN 106771633A CN 201611264853 A CN201611264853 A CN 201611264853A CN 106771633 A CN106771633 A CN 106771633A
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- resistance
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- circuit
- processor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a kind of hand-held instrument for measuring DC resistance, including：Processor is provided with housing；Signal acquisition circuit is connected with the first port of the processor, and the signal acquisition circuit is used for collection voltages；Constant-current source circuit, the constant-current source circuit is connected with the second port of the processor, and the constant-current source circuit is used to provide constant current；Display output circuit, the display output circuit is connected with the 3rd port of the processor, for showing the resistance value measured；Wherein, the signal acquisition circuit, the constant-current source circuit are made with the display output circuit using microelectronic element；In this way, because of microelectronic element small volume, using the signal acquisition circuit of microelectronic element making, the constant-current source circuit also can be smaller with the volume of the display output circuit, and then reduces the volume of instrument for measuring DC resistance, easy to carry, one-hand operation；Measurement operation is simple, is greatly saved time of measuring, improves operating efficiency.
Description
Technical field
The present invention relates to D.C. resistance technical field of measurement and test, more particularly to a kind of hand-held instrument for measuring DC resistance.
Background technology
D.C. resistance test is transformer after handing-over, overhaul and changing shunting switch, essential pilot project.
Under normal conditions, usually set come measuring transformer winding and high-power inductance using bridge method and pressure decline method
Standby D.C. resistance, but existing instrument for measuring DC resistance is bulky, not Portable belt, and measurement gets up time-consuming taking a lot of work.
The content of the invention
For the problem that prior art is present, a kind of hand-held instrument for measuring DC resistance is the embodiment of the invention provides, used
In solution in the prior art, when the D.C. resistance to transformer or high-power inductive devices is tested, existing D.C. resistance
Tester is bulky, and measurement complex procedures cause the technical problem that measurement efficiency declines.
The present invention provides a kind of hand-held instrument for measuring DC resistance, and the instrument for measuring DC resistance includes：
Housing, processor is provided with the housing；
Signal acquisition circuit, the signal acquisition circuit is connected with the first port of the processor, the signal acquisition
Circuit is used for collection voltages；
Constant-current source circuit, the constant-current source circuit is connected with the second port of the processor, and the constant-current source circuit is used
In offer constant current；
Display output circuit, the display output circuit is connected with the 3rd port of the processor, is measured for showing
Resistance value；Wherein, the signal acquisition circuit, the constant-current source circuit and the display output circuit are using microelectronics unit
What part was made.
In such scheme, the test pattern of the instrument for measuring DC resistance includes：
Single channel resistance or single channel inductance measurement, the test of unidirectional high-low pressure winding, one side Y connecting test, unidirectional YN connection surveys
Examination and unilateral corner connection test.
In such scheme, the instrument for measuring DC resistance also includes：
Signal amplification circuit, one end of the signal amplification circuit is connected with one end of the signal acquisition circuit, described
The other end of signal amplification circuit is connected with the first port of the processor.
In such scheme, the instrument for measuring DC resistance also includes：
Temperature measurement circuit, the temperature measurement circuit is connected with the 4th port of the processor.
In such scheme, the instrument for measuring DC resistance also includes：
Storage circuit, the storage circuit is connected with the fifth port of the processor.
In such scheme, the instrument for measuring DC resistance also includes：
AC/DC change-over circuits, the AC/DC change-over circuits are connected with the 6th port of the processor.
In such scheme, the instrument for measuring DC resistance also includes：USB interface, the USB interface is arranged on the housing
One end.
In such scheme, the instrument for measuring DC resistance also includes：
Current output terminal, the current output terminal is arranged on the other end of the housing；
Voltage measurement terminal, the voltage measurement terminal is arranged on the side of the current output terminal.
In such scheme, the instrument for measuring DC resistance also includes：Human-computer interaction interface, the human-computer interaction interface is installed
In the side of the housing, the human-computer interaction interface is connected with the display output circuit.
In such scheme, the instrument for measuring DC resistance also includes：
Power interface, the power interface is arranged between the current output terminal and USB interface.
The invention provides a kind of hand-held instrument for measuring DC resistance, the instrument for measuring DC resistance includes：Housing, it is described
Processor is provided with housing；Signal acquisition circuit, the signal acquisition circuit is connected with the first port of the processor, institute
Signal acquisition circuit is stated for collection voltages；Constant-current source circuit, the second port phase of the constant-current source circuit and the processor
Even, the constant-current source circuit is used to provide constant current；Display output circuit, the display output circuit and the processor
3rd port is connected, for showing the resistance value measured；Wherein, the signal acquisition circuit, the constant-current source circuit with it is described
Display output circuit is made using microelectronic element；In this way, because of microelectronic element small volume, using microelectronic element system
The signal acquisition circuit of work, the constant-current source circuit also can be smaller with the volume of the display output circuit, and then reduce straight
The volume of leakage resistance tester, easy to carry, one-hand operation, measurement operation is simple, so as to improve measurement efficiency.
Brief description of the drawings
Fig. 1 is the electrical block diagram of instrument for measuring DC resistance provided in an embodiment of the present invention；
Fig. 2 is the overall structure diagram of instrument for measuring DC resistance provided in an embodiment of the present invention；
Fig. 3 is the wiring diagram of single channel resistance provided in an embodiment of the present invention or single channel inductance measurement；
Fig. 4 is the wiring diagram of unidirectional high-low pressure winding test provided in an embodiment of the present invention；
Fig. 5 is the wiring diagram of unilateral Y connecting tests provided in an embodiment of the present invention；
Fig. 6 is the wiring diagram of unidirectional YN connecting tests provided in an embodiment of the present invention；
Fig. 7 is the wiring diagram of unilateral corner connection test provided in an embodiment of the present invention.
Specific embodiment
The invention provides a kind of hand-held instrument for measuring DC resistance, the instrument for measuring DC resistance includes：Housing, it is described
Processor is provided with housing；Signal acquisition circuit, the signal acquisition circuit is connected with the first port of the processor, institute
Signal acquisition circuit is stated for collection voltages；Constant-current source circuit, the second port phase of the constant-current source circuit and the processor
Even, the constant-current source circuit is used to provide constant current；Display output circuit, the display output circuit and the processor
3rd port is connected, for showing the resistance value measured；Wherein, the signal acquisition circuit, the constant-current source circuit with it is described
Display output circuit is made using microelectronic element.
Technical scheme is described in further detail below by drawings and the specific embodiments.
The present embodiment provides a kind of hand-held instrument for measuring DC resistance, as shown in figure 1, the instrument for measuring DC resistance bag
Include：Processor 1, signal acquisition circuit 2, constant-current source circuit 3, display output circuit 4；Wherein,
The processor 1 can be arm processor and periphery, and the RAM processors treatment effeciency is high, fireballing spy
Point.The processor 1 is used to receive the signal of each functional circuit transmission and sends control instruction to each functional circuit.
Here, the constant-current source circuit 3 is connected with the second port of the processor 1, and the constant-current source circuit 3 is used to carry
For constant current；Because the precision of resistance measurement is heavily dependent on the stability for being applied to ohmically electric current, therefore
Current stabilization also is carried out to constant-current source circuit 3 in the present embodiment, while carrying out voltage stabilizing to the power supply of constant-current source circuit 3, electricity is eliminated
The ripple interference in source, improves constant-current characteristics.Because the Standard resistance range for measuring resistance is wider, it is necessary to apply to different Standard resistance ranges
Different electric currents, therefore constant-current source circuit 3 is provided with three electric current gears, respectively 20mA, 200mA, 2A.
When pressure drop is produced in measured resistance, the signal acquisition circuit 2 collects voltage, and voltage is sent to treatment
Device 1, processor 1 calculates the resistance of measured resistance according to the current value of the voltage and current selected；And send the resistance
To the display output circuit 4, the display output circuit 4 is connected with the 3rd port of the processor 1, is measured for showing
Resistance value.
Further, referring to Fig. 1, in order to strengthen the signal that signal acquisition circuit 2 is collected, the instrument for measuring DC resistance
Also include：Signal amplification circuit 5, one end of the signal amplification circuit 5 is connected with signal acquisition circuit 2, and the signal amplifies
The other end of circuit 5 is connected with the first port of processor, is amplified with to the signal for collecting；The signal amplification circuit
5 with arithmetic unit as core, and the stability after signal amplifies is improved with input impedance very high, and signal amplification circuit 5 has
There are different gain amplifiers, can be suitably used for the measurement range of different resistances.
Here, the instrument for measuring DC resistance also includes：Temperature measurement circuit 6, the temperature measurement circuit 6 and the processor 1
4th port is connected；Because temperature has a certain impact to the resistance of measured resistance, such as the measurement standard of cable resistance is 30
Measured under DEG C steady temperature, but actual measuring environment is extremely difficult to this condition, therefore also needed to environment in measurement resistance
Temperature is measured, and then sends to processor 1 environment temperature, and current environmental temperature conversion is line-internal by processor 1
The temperature of operation, to ensure measuring accuracy.
In order to be stored to test data, the instrument for measuring DC resistance also includes：Storage circuit 7, wherein, institute
State storage circuit 7 to be connected with the fifth port of the processor 1, for storing test data.Here, the D.C. resistance test
Instrument also includes perpetual calendar, while test data is stored, can also together store the current testing time.Wherein, it is described
The data storage of storage circuit is 10000 groups, and data are not lost when shutting down.
In order to be charged to DC test instrument, the DC test instrument also includes：AC/DC change-over circuits 8 and institute
The 6th port for stating processor 1 is connected, and the AC/DC change-over circuits 8 are surveyed for alternating current to be converted into direct current with to direct current
Examination instrument is charged, and in incoming transport electricity, automatically switches to AC-powered pattern, in not incoming transport electricity, by built-in
Lithium battery be powered, lithium battery can continuously work 10h under typical condition.The typical condition refers to that measured resistance is less than
100m Ω, 2A current gears, and lithium battery is in the state of completely filling.
Here, in order to ensure the safety after test, the instrument for measuring DC resistance also includes：Discharge circuit 9 and alarm electricity
Road 10；Wherein, the discharge circuit 9 is connected with the 8th port of the processor 1；The warning circuit 10 and the processor
1 the 9th port is connected.After present mode is completed, during into next test pattern, the discharge circuit can be to working as front mould
The test of formula is discharged, autodegauss.It is that, in order to avoid the maloperation of staff, the warning circuit 10 is also in electric discharge
Electric discharge prompt tone can be given.
Wherein, in order to reduce the size of instrument for measuring DC resistance, signal acquisition circuit 2, constant-current source circuit 3, display output
Circuit 4, signal amplification circuit 5, temperature measurement circuit 6, storage circuit 7 and AC/DC change-over circuits 8, the discharge circuit 9 and alarm electricity
Road 10 is made using microelectronic element；It is exactly above the main circuit logic of instrument for measuring DC resistance.
Further, referring to Fig. 2, the instrument for measuring DC resistance also includes：Housing 21, USB interface 22, current output terminal
Son 23, voltage measurement terminal 24, human-computer interaction interface 25, power interface 26, instruction 27, power supply indicator 28, return key of charging
29th, selection key 30, acknowledgement key 31 and power switch key 32 etc.；Wherein,
The processor 1 is placed in the housing 21, the housing 170mm long, 119mm wide, 45mm high；The USB connects
Mouth 22 is arranged on one end of the housing 21, can be derived into external equipment test data by USB interface 22.
Current output terminal 23 is arranged on the other end of the housing 21, and the voltage measurement terminal 24 is arranged on the electricity
Flow the side of lead-out terminal 23.
The human-computer interaction interface 25 is arranged on the side of the housing 21, the human-computer interaction interface 25 and the display
Output circuit 4 is connected；Wherein, the human-computer interaction interface 25 can be liquid crystal display.
The power interface 26 is arranged between the current output terminal 24 and USB interface 22, to the D.C. resistance
When tester is charged, power supply adaptor is inserted into the power interface 26.
The charging indicator light 27 and power supply indicator 28 are arranged on the first side of the human-computer interaction interface 25, when to institute
When stating instrument for measuring DC resistance and being charged, the charging indicator light 27 is lighted；After charging is finished, charging indicator light 27 extinguishes.
When power supply indicator 28 is lighted, represent that now instrument for measuring DC resistance is currently in use AC power and be powered, when power supply refers to
When showing that lamp 28 extinguishes, represent that now instrument for measuring DC resistance is currently in use lithium battery and be powered.
The return key 29, selection key 30, acknowledgement key 31 and power switch key 32 are successively set on man-machine interaction circle
Second side in face 25；The return key 29 can cancel the operation of current interface and return to upper level interface, and the selection key 30 can
Selection test pattern；The acknowledgement key 31 is confirmation current operation, or enters the next option；The power switch key 32 is whole machine
The connection of power supply and closing, with anti-error shut-off function.Close duration and press the key, being covered when progress bar can just shut down.
During practical application, when the D.C. resistance to powerful devices such as transformers is tested, power switch key is pressed
32 open DC test instrument, select system to set on human-computer interaction interface 25, to time, screen contrast in system setting
Degree, backlight shut-in time, whether enable the parameters such as auditory tone cues and be configured, after setting completed, main menu is returned to, according to transformation
The mode of connection of device selects corresponding test pattern in guide is tested, the test of instrument for measuring DC resistance described in the present embodiment
Pattern includes five kinds：Single channel resistance or single channel inductance measurement, the test of unidirectional high-low pressure winding, one side Y connecting test, unidirectional YN companies
Connect test and unilateral corner connection test.Also, the instrument for measuring DC resistance has synchronous winding magnetization technology negative to big perception
Row accurately and quickly D.C. resistance test is loaded into, the connection of either star-like connection (unilateral Y connecting tests), or triangle is (single
Side angle connects test) winding, disposable wiring can complete three-phase dc resistance measurement, and automatically calculate three-phase imbalance
Rate, is greatly saved time of measuring, improves operating efficiency.
Wherein, the wiring diagram of the single channel resistance or single channel inductance measurement can be found in Fig. 3；The unidirectional high-low pressure winding is surveyed
The wiring diagram of examination can be found in the wiring diagram of Fig. 4, one side Y connecting tests reference can be made to Fig. 5, the wiring diagram of unidirectional YN connecting tests can join
See Fig. 6, the wiring diagram of unilateral corner connection test can be found in Fig. 7.Wherein, in Fig. 3 to Fig. 7, Ic, Ib, Ia, In terminal are that electric current is defeated
Go out terminal；Uc、Ub, Ua, Un terminal be voltage measurement terminal.
After test pattern chooses, into test electric current selection page selection test electric current；When test electric current determines
After good, the material of measurand, such as copper or aluminium, so that the temperature coefficient of measurand can be measured are selected；And then enter selection
Measurand temperature " interface, selection setting actual temperature is rolled by the selection key of display screen, and the actual temperature is at " 0 DEG C -150
It is optional in the range of DEG C ", instrument is defaulted as 25 DEG C；But actual temperature typically can with line material internal operating temperature difference,
Here, after actual temperature is determined, also need selected reduced temperature, the actual temperature " optional in the range of 0 DEG C -150 DEG C ",
Instrument is defaulted as 75 DEG C.
After above-mentioned parameter all sets, press startup test button, instrument can according to selected test pattern with
Electric current is tested, and after being completed, instrument automatic discharging completes test.After being completed, tester can be clear by data
Function of looking at browses test data on human-computer interaction interface 25.
Above is testing process during automatic test.
Here, it is also possible to select manual test to be tested, manual test needs choosing from unlike automatic test uniquely
TCH test channel is selected, other testing process all sames will not be repeated here.
The beneficial effect that one or more embodiments provided in an embodiment of the present invention are brought is：
The invention provides a kind of hand-held instrument for measuring DC resistance, the instrument for measuring DC resistance includes：Housing, it is described
Processor is provided with housing；Signal acquisition circuit, the signal acquisition circuit is connected with the first port of the processor, institute
Signal acquisition circuit is stated for collection voltages；Constant-current source circuit, the second port phase of the constant-current source circuit and the processor
Even, the constant-current source circuit is used to provide constant current；Display output circuit, the display output circuit and the processor
3rd port is connected, for showing the resistance value measured；Wherein, the signal acquisition circuit, the constant-current source circuit with it is described
Display output circuit is made using microelectronic element；In this way, because of microelectronic element small volume, using microelectronic element system
The signal acquisition circuit of work, the constant-current source circuit also can be smaller with the volume of the display output circuit, and then reduce straight
The volume of leakage resistance tester, easy to carry, one-hand operation；Test pattern in including 5 in the instrument for measuring DC resistance, and
Accurately and quickly D.C. resistance test, either star-like connection can be carried out to big inductive load with synchronous winding magnetization technology
(unilateral Y connecting tests), or triangle connects the winding of (unilateral corner connection test), and disposable wiring can complete three-phase dc
The measurement of resistance, and the unbalance factor of three-phase is calculated automatically, measurement operation is simple, is greatly saved time of measuring, improves work effect
Rate.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention, it is all
Any modification, equivalent and improvement for being made within the spirit and principles in the present invention etc., should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of hand-held instrument for measuring DC resistance, it is characterised in that the instrument for measuring DC resistance includes：
Housing, processor is provided with the housing；
Signal acquisition circuit, the signal acquisition circuit is connected with the first port of the processor, the signal acquisition circuit
For collection voltages；
Constant-current source circuit, the constant-current source circuit is connected with the second port of the processor, and the constant-current source circuit is used to carry
For constant current；
Display output circuit, the display output circuit is connected with the 3rd port of the processor, for showing the electricity measured
Resistance；Wherein, the signal acquisition circuit, the constant-current source circuit and the display output circuit are using microelectronic element system
Into.
2. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the test pattern of the instrument for measuring DC resistance
Including：
Single channel resistance or single channel inductance measurement, the test of unidirectional high-low pressure winding, one side Y connecting test, unidirectional YN connecting tests and
Unilateral corner connection test.
3. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：
Signal amplification circuit, one end of the signal amplification circuit is connected with one end of the signal acquisition circuit, the signal
The other end of amplifying circuit is connected with the first port of the processor.
4. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：
Temperature measurement circuit, the temperature measurement circuit is connected with the 4th port of the processor.
5. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：
Storage circuit, the storage circuit is connected with the fifth port of the processor.
6. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：
AC/DC change-over circuits, the AC/DC change-over circuits are connected with the 6th port of the processor.
7. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：USB
Interface, the USB interface is arranged on one end of the housing.
8. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：
Current output terminal, the current output terminal is arranged on the other end of the housing；
Voltage measurement terminal, the voltage measurement terminal is arranged on the side of the current output terminal.
9. the instrument for measuring DC resistance as shown in claim 1, it is characterised in that the instrument for measuring DC resistance also includes：People
Machine interactive interface, the human-computer interaction interface is arranged on the side of the housing, and the human-computer interaction interface is defeated with the display
Go out circuit to be connected.
10. the instrument for measuring DC resistance as shown in claim 7, it is characterised in that the instrument for measuring DC resistance also includes：
Power interface, the power interface is arranged between the current output terminal and USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611264853.1A CN106771633A (en) | 2016-12-30 | 2016-12-30 | Hand-held instrument for measuring DC resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611264853.1A CN106771633A (en) | 2016-12-30 | 2016-12-30 | Hand-held instrument for measuring DC resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106771633A true CN106771633A (en) | 2017-05-31 |
Family
ID=58951753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611264853.1A Pending CN106771633A (en) | 2016-12-30 | 2016-12-30 | Hand-held instrument for measuring DC resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106771633A (en) |
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| CN110780121A (en) * | 2019-11-26 | 2020-02-11 | 中冶宝钢技术服务有限公司 | Motor winding resistance measuring device and motor winding resistance measuring instrument |
| CN111596132A (en) * | 2020-05-25 | 2020-08-28 | 广东电网有限责任公司东莞供电局 | DC resistance tester |
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| CN110780121A (en) * | 2019-11-26 | 2020-02-11 | 中冶宝钢技术服务有限公司 | Motor winding resistance measuring device and motor winding resistance measuring instrument |
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Application publication date: 20170531 |