CN201673250U - Electricity energy meter accuracy tester under condition of pulse train interference - Google Patents
Electricity energy meter accuracy tester under condition of pulse train interference Download PDFInfo
- Publication number
- CN201673250U CN201673250U CN2010201808770U CN201020180877U CN201673250U CN 201673250 U CN201673250 U CN 201673250U CN 2010201808770 U CN2010201808770 U CN 2010201808770U CN 201020180877 U CN201020180877 U CN 201020180877U CN 201673250 U CN201673250 U CN 201673250U
- Authority
- CN
- China
- Prior art keywords
- arteries
- veins
- output terminal
- live wire
- input end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses an electricity energy meter accuracy tester under a condition of pulse train interference, which is used for an electricity energy meter provided with a live wire input end, a zero wire input end, a current input end, a current output end and a pulse output end. The tester comprises a pulse train tester, a first decoupling circuit, a calibrator provided with a pulse acquisition end and a second decoupling circuit, an output end of the calibrator is connected with an input end of the pulse train tester after passing through the decoupling circuits, an output end of the pulse train tester is connected with the live wire input end, the zero wire input end, the current input end and the current output end of the electricity energy meter, and the pulse output end of the electricity energy meter is connected with the pulse acquisition end of the calibrator after passing through the second decoupling circuit. The electricity energy meter accuracy tester omits an expensive decoupling device by sufficiently utilizing coupling of the pulse train tester and the decoupling circuits, is few in electricity consumption during testing as fictional load is adopted and is low in cost because costs of the decoupling circuits are within 100 RMB.
Description
[technical field]
The utility model relates to the electric energy measurement instrument field tests, is specifically related to the test unit of electric energy meter accuracy under the pulse train disturbed condition.
[background technology]
The electric energy meter product causes the test (being the test of the pulse train amount of influence) that accuracy changes under pulse train disturbs at present, consumer adopts real load in its test unit, test the value of the electric flux of real load consumption by electric energy meter and standard scale and compare, need to dispose expensive interference source decoupling equipment in the test.
Existing test method and testing equipment need in test to consume the real electric flux with the measured power equal quantities, need to dispose the decoupling equipment of interference source in the test.Need the investment in fixed assets of testing equipment and the electric power energy consumption of process of the test, device load changeability is restricted.
[summary of the invention]
The purpose of this utility model solves the problems of the prior art exactly, proposes the test unit of electric energy meter accuracy under a kind of pulse train disturbed condition, not only can reduce the power consumption in the process of the test, and can reduce equipment investment cost.
For achieving the above object, the utility model proposes the test unit of electric energy meter accuracy under a kind of pulse train disturbed condition, be used to have table live wire input end, table zero line input end, the table current input terminal, the electric energy meter of table current output terminal and pulse output end, comprise the pulse train test instrument, first isolation circuit, tester with pulse collection end, second isolation circuit, the output terminal of described tester is connected to the input end of pulse train test instrument after by isolation circuit, the output terminal of pulse train test instrument is connected to the table live wire input end of electric energy meter, table zero line input end, table current input terminal and table current output terminal, the pulse output end of electric energy meter is connected to the pulse collection end of tester after through second isolation circuit.
As preferably, described tester has school live wire output terminal, school zero line output terminal, school current input terminal and school current output terminal, and described surge tester comprises the arteries and veins first live wire input end, the arteries and veins first live wire output terminal, the arteries and veins second live wire input end, the arteries and veins second live wire output terminal, arteries and veins the 3rd live wire input end, arteries and veins the 3rd live wire output terminal, arteries and veins zero line input end and arteries and veins zero line output terminal; Described school live wire output terminal is connected to the arteries and veins first live wire input end after through first isolation circuit, and the arteries and veins first live wire output terminal is connected to table live wire input end; Described school zero line output terminal is connected to arteries and veins zero line input end after through first isolation circuit, and arteries and veins zero line output terminal is connected to table zero line input end; Described school current input terminal is connected to the arteries and veins second live wire input end after through first isolation circuit, and the arteries and veins second live wire output terminal is connected to the table current input terminal; Described school current output terminal is connected to arteries and veins the 3rd live wire input end after through first isolation circuit, and arteries and veins the 3rd live wire output terminal is connected to the table current output terminal.
As preferably, described first isolation circuit comprises the electric capacity of magnet ring and ground connection, and second isolation circuit comprises the electric capacity of magnet ring and ground connection.
For achieving the above object, the utility model has also proposed the multilist test unit of electric energy meter accuracy under a kind of pulse train disturbed condition, be used to have table live wire input end, table zero line input end, the table current input terminal, at least two electric energy meters of table current output terminal and pulse output end, comprise the pulse train test instrument, first isolation circuit, tester with pulse collection end, second isolation circuit, the table live wire input end of tested electric energy meter is connected with the arteries and veins first live wire output terminal of pulse train test instrument, the table zero line input end of all electric energy meters connects, the table current output terminal of last electric energy meter is connected to the table current input terminal of back one electric energy meter and realizes that the head and the tail of all electric energy meters are in series, the output terminal of described tester is connected to the input end of pulse train test instrument after by isolation circuit, the output terminal of pulse train test instrument is connected to the table live wire input end of tested electric energy meter, table zero line input end, first table current input terminal and last table current output terminal, the pulse output end of tested electric energy meter are connected to the pulse collection end of tester after through second isolation circuit.
As preferably, described tester has school live wire output terminal, school zero line output terminal, school current input terminal and school current output terminal, and described pulse train test instrument comprises the arteries and veins first live wire input end, the arteries and veins first live wire output terminal, the arteries and veins second live wire input end, the arteries and veins second live wire output terminal, arteries and veins the 3rd live wire input end, arteries and veins the 3rd live wire output terminal, arteries and veins zero line input end and arteries and veins zero line output terminal; Described school live wire output terminal is connected to the arteries and veins first live wire input end after through first isolation circuit, and the arteries and veins first live wire output terminal is connected to table live wire input end; Described school zero line output terminal is connected to arteries and veins zero line input end after through first isolation circuit, and arteries and veins zero line output terminal is connected to table zero line input end; Described school current input terminal is connected to the arteries and veins second live wire input end after through first isolation circuit, and the arteries and veins second live wire output terminal is connected to the table current input terminal; Described school current output terminal is connected to arteries and veins the 3rd live wire input end after through first isolation circuit, and arteries and veins the 3rd live wire output terminal is connected to the table current output terminal.
As preferably, described first isolation circuit comprises the electric capacity of magnet ring and ground connection, and second isolation circuit comprises the electric capacity of magnet ring and ground connection.
The beneficial effects of the utility model: the utility model makes full use of the coupling and the isolation circuit of surge tester, has saved expensive isolator, only need add cheaply element again and do to replenish and get final product; Utilize four road coupling circuit reasonable distribution of pulse train test instrument to give the electric current and the voltage circuit of sample, can accomplish that the circuit of any sample all can set the pulse train combination coupling (because of the pulse train test instrument can be exported multichannel assembled pulse group) of pulse train coupling or many circuits arbitrarily; This infrastructure cost is low, the cost of the isolation circuit that other adds is in 100 yuan, adopt virtual load, little power consumption during test, overcome existing proving installation and adopted the shortcoming that real load power consumption is big, need purchase the expensive decoupling device of thousands of units, and actual effect is enough to satisfy the electric energy meter burst of pulses influence that " general requirement test of GB/T17215.211-2006 alternating current measuring equipment and test condition " require and measures examination, has very high practical value.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the structural representation of the test unit of electric energy meter accuracy under the utility model pulse train disturbed condition;
Fig. 2 is the structural representation of isolation circuit in the test unit of electric energy meter accuracy under the utility model pulse train disturbed condition.
[embodiment]
Embodiment one:
As shown in Figure 1, the test unit of electric energy meter accuracy under the pulse train disturbed condition is used to have table live wire input end L
Table, table zero line input end N
Table, table current input terminal I
Table is gone into, table current output terminal I
Show outWith pulse output end M
Go out Electric energy meter 1, comprise pulse train test instrument 2, first isolation circuit 3, have pulse collection end M
Go intoTester 4, second isolation circuit 5, the output terminal of described tester 4 is connected to the input end of pulse train test instrument 2 after by isolation circuit 3, the output terminal of pulse train test instrument 2 is connected to the table live wire input end L of electric energy meter 1
Table, table zero line input end N
Table, table current input terminal I
Table is gone intoWith table current output terminal I
Show out, the pulse collection end M that the pulse output end M of electric energy meter 1 goes out through being connected to tester 4 behind second isolation circuit 5 goes into.As shown in Figure 2, first isolation circuit 3 and second isolation circuit 5 all adopt the capacitor C of magnet ring CH and ground connection, and among the figure, in " L or N or imp+ or imp-", L refers to live wire, N nulling line, and imp+ and imp-all refer to taps.
Described tester 4 has school live wire output terminal L
The school, school zero line output terminal N
The school, school current input terminal I
The school Go into, and school current output terminal I
The school goes out, described pulse train test instrument 2 comprises the arteries and veins first live wire input end L
Arteries and veins goes into 1, the arteries and veins first live wire output terminal L
Arteries and veins goes out 1, the arteries and veins second live wire input end L
Arteries and veins goes into 2, the arteries and veins second live wire output terminal L
Arteries and veins goes out 2, arteries and veins the 3rd live wire input end L
Arteries and veins goes into 3, arteries and veins the 3rd live wire output terminal L
Arteries and veins goes out 3, arteries and veins zero line input end N
Arteries and veins is gone intoWith arteries and veins zero line output terminal N
Arteries and veins goes outDescribed school live wire output terminal L
The schoolThrough being connected to the arteries and veins first live wire input end L behind first isolation circuit 3
Arteries and veins goes into 1, the arteries and veins first live wire output terminal L
Arteries and veins goes out 1Be connected to table live wire input end L
TableDescribed school zero line output terminal N
The schoolThrough being connected to arteries and veins zero line input end N behind first isolation circuit 3
Arteries and veins is gone into, arteries and veins zero line output terminal N
Arteries and veins goes outBe connected to table zero line input end N
TableDescribed school current input terminal I
The school is gone intoBehind past first coupling circuit 3, be connected to the arteries and veins second live wire input end L
Arteries and veins goes into 2, the arteries and veins second live wire output terminal L
Arteries and veins goes out 2Be connected to table current input terminal I
Table is gone intoDescribed school current output terminal I
The school goes outThrough being connected to arteries and veins the 3rd live wire input end L behind first isolation circuit 3
Arteries and veins goes into 3, arteries and veins the 3rd live wire output terminal L
Arteries and veins goes out 3Be connected to table current output terminal I
Show out
Test method:
1. standard self-correcting: as Fig. 1, tester 4, pulse train test instrument 2 (comprising power switch) are opened, the output of tester 4 is made as: reference state value, the output power W1 of observation internal standard table; Verification standard state is the same, and pulse train test instrument 2 adds the electric energy meter pulse train magnitude of voltage that GB/T17215.211-2006 requires, and observes the output power W2 of internal standard table; If (W2-W1)/and W1 is better than that the amount of influence changes magnitude of the limit in the GB/T17215.211-2006 standard, and the self-correcting of then verification standard is qualified, can carry out specimen test.
2. to being tested: A) electric energy meter 1, pulse train test instrument 2, tester 4 are connected by aforementioned connected mode by test specimen (single-phase table); B) tester 4, pulse train test instrument 2 (comprising power switch) are opened, the output of calibration equipment is made as: the reference state value shows on the tester by the error delta 1 of test specimen; C) verification standard state is the same, and pulse train test instrument 2 applies the electric energy meter pulse train magnitude of voltage that GB/T17215.211-2006 requires, and shows by the error delta 2 of test specimen on the tester.
3. data processing: with resulting Δ 1, Δ 2 in the preceding step test subtract each other obtain Δ=| Δ 1-Δ 2|.
4. the result judges: if back 3 is finished in test) in Δ≤δ then test findings is qualified, otherwise defective wherein δ is the burst of pulses amount of an influence change ultimate value.
Embodiment two:
The multilist test unit of electric energy meter accuracy under the pulse train disturbed condition is used to have table live wire input end L
Table, table zero line input end N
Table, table current input terminal I
Table is gone into, table current output terminal I
Show outWith pulse output end M
Go outAt least two electric energy meters 1, comprise pulse train test instrument 2, first isolation circuit 3, have pulse collection end M
Go intoTester 4, second isolation circuit 5, the table live wire input end L of tested electric energy meter 1
TableWith the arteries and veins first live wire output terminal L
Arteries and veins goes out 1Connect the table zero line input end N of all electric energy meters 1
TableConnect the table current output terminal I of last electric energy meter 1
Show outBe connected to the table current input terminal I of back one electric energy meter 1
Table is gone intoThe head and the tail of realizing all electric energy meters are in series, and the output terminal of described tester 4 is connected to the input end of pulse train test instrument 2 after by isolation circuit 3, and the output terminal of pulse train test instrument 2 is connected to the table live wire input end L of tested electric energy meter 1
Table, table zero line input end N
Table, table current input terminal I
Table is gone intoWith table current output terminal I
Show out, the pulse output end M of electric energy meter 1
Go outThrough being connected to the pulse collection end M of tester 4 behind second isolation circuit 5
Go into
So the difference of present embodiment and embodiment one a plurality of electric energy meter I lines are connected mutually be connected with pulse train test instrument I line, pulse train test instrument L
Arteries and veins goes out 1/ N
Arteries and veins goes out 1After tested table L/N links to each other, with the pulse collection end M of tester 4
Go intoIts error of pulse measurement of when not adding pulse train and adding pulse train, gathering each sample respectively.Principle is identical with embodiment one, because series and parallel is an electricity general knowledge, all no longer illustrate.
Embodiment three: all samples
Verification device pulse constant is made as 3 times of electric energy meter constants in the three-phase watch test.UA, UB, the UC of sample are connected together, and the N of all samples connects together, and electric current is all connected, with the pulse collection end M of tester 4
Go intoIn its error of pulse measurement that does not add pulse train and gather each sample respectively when adding pulse train, wherein sample pulse constant is set is 3 times of sample actual pulse constant to tester.Principle and embodiment one, two are similar, no longer diagram.
The foregoing description is to explanation of the present utility model, is not to qualification of the present utility model, any scheme after the utility model simple transformation is all belonged to protection domain of the present utility model.
Claims (6)
1. the test unit of electric energy meter accuracy under the pulse train disturbed condition is used to have table live wire input end (L
Table), table zero line input end (N
Table), table current input terminal (I
Table is gone into), table current output terminal (I
Show out) and pulse output end (M
Go out) electric energy meter (1), it is characterized in that: comprise pulse train test instrument (2), first isolation circuit (3), have pulse collection end (M
Go into) tester (4), second isolation circuit (5), the output terminal of described tester (4) is connected to the input end of pulse train test instrument (2) after by isolation circuit (3), and the output terminal of pulse train test instrument (2) is connected to the table live wire input end (L of electric energy meter (1)
Table), table zero line input end (N
Table), table current input terminal (I
Table is gone into) and table current output terminal (I
Show out), the pulse output end (M of electric energy meter (1)
Go out) through being connected to the pulse collection end (M of tester (4) behind second isolation circuit (5)
Go into).
2. the test unit of electric energy meter accuracy under the pulse train disturbed condition as claimed in claim 1 is characterized in that: described tester (4) has school live wire output terminal (L
The school), school zero line output terminal (N
The school), school current input terminal (I
The school is gone into) and school current output terminal (I
The school goes out), described pulse train test instrument (2) comprises the first live wire input end (L
Arteries and veins goes into 1), the first live wire output terminal (L
Arteries and veins goes out 1), the second live wire input end (L
Arteries and veins Go into 2), the second live wire output terminal (L
Arteries and veins goes out 2), the 3rd live wire input end (L
Arteries and veins goes into 3), the 3rd live wire output terminal (L
Arteries and veins goes out 3), arteries and veins zero line input end (N
Arteries and veins is gone into) and arteries and veins zero line output terminal (N
Arteries and veins goes out); Described school live wire output terminal (L
The school) through being connected to the arteries and veins first live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 1), the arteries and veins first live wire output terminal (L
Arteries and veins goes out 1) be connected to and show live wire input end (L
Table); Described school zero line output terminal (N
The school) through being connected to arteries and veins zero line input end (N behind first isolation circuit (3)
Arteries and veins is gone into), arteries and veins zero line output terminal (N
Arteries and veins Go out) be connected to and show zero line input end (N
Table); Described school current input terminal (I
The school is gone into) through being connected to the arteries and veins second live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 2), the arteries and veins second live wire output terminal (L
Arteries and veins goes out 2) be connected to and show current input terminal (I
Table is gone into); Described school current output terminal (I
The school goes out) through being connected to arteries and veins the 3rd live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 3), arteries and veins the 3rd live wire output terminal (L
Arteries and veins goes out 3) be connected to and show current output terminal (I
Show out).
3. the test unit of electric energy meter accuracy under the pulse train disturbed condition as claimed in claim 1 or 2 is characterized in that: described first isolation circuit (3) comprises the electric capacity of magnet ring and ground connection, and second isolation circuit (5) comprises the electric capacity of magnet ring and ground connection.
4. the multilist test unit of electric energy meter accuracy under the pulse train disturbed condition is used to have table live wire input end (L
Table), table zero line input end (N
Table), table current input terminal (I
Table is gone into), table current output terminal (I
Show out) and pulse output end (M
Go out) at least two electric energy meters (1), it is characterized in that: comprise pulse train test instrument (2), first isolation circuit (3), have pulse collection end (M
Go into) tester (4), second isolation circuit (5), the table live wire input end (L of tested electric energy meter (1)
Table) with the arteries and veins first live wire output terminal (L of pulse train test instrument
Arteries and veins goes out 1) connect the table zero line input end (N of all electric energy meters (1)
Table) connect the table current output terminal (I of last electric energy meter (1)
Show out) be connected to the back one electric energy meter (1) table current input terminal (I
Table is gone into) realize that the head and the tail of all electric energy meters are in series, the output terminal of described tester (4) is connected to the input end of pulse train test instrument (2) after by isolation circuit (3), and the output terminal of pulse train test instrument (2) is connected to the table live wire input end (L of tested electric energy meter (1)
Table), table zero line input end (N
Table), table current input terminal (I
Table is gone into) and table current output terminal (I
Show out), the pulse output end (M of tested electric energy meter (1)
Go out) through being connected to the pulse collection end (M of tester (4) behind second isolation circuit (5)
Go into).
5. the multilist test unit of electric energy meter accuracy under the pulse train disturbed condition as claimed in claim 4 is characterized in that: described tester (4) has school live wire output terminal (L
The school), school zero line output terminal (N
The school), school current input terminal (I
The school is gone into) and school current output terminal (I
The school goes out), described pulse train test instrument (2) comprises the first live wire input end (L
Arteries and veins goes into 1), the first live wire output terminal (L
Arteries and veins goes out 1), the second live wire input end (L
Arteries and veins goes into 2), the second live wire output terminal (L
Arteries and veins goes out 2), the 3rd live wire input end (L
Arteries and veins goes into 3), the 3rd live wire output terminal (L
Arteries and veins goes out 3), arteries and veins zero line input end (N
Arteries and veins is gone into) and arteries and veins zero line output terminal (N
Arteries and veins goes out); Described school live wire output terminal (L
The school) through being connected to the arteries and veins first live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 1), the arteries and veins first live wire output terminal (L
Arteries and veins goes out 1) be connected to and show live wire input end (L
Table); Described school zero line output terminal (N
The school) through being connected to arteries and veins zero line input end (N behind first isolation circuit (3)
Arteries and veins is gone into), arteries and veins zero line output terminal (N
Arteries and veins goes out) be connected to and show zero line input end (N
Table); Described school current input terminal (I
The school is gone into) through being connected to the arteries and veins second live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 2), the arteries and veins second live wire output terminal (L
Arteries and veins goes out 2) be connected to and show current input terminal (I
Table is gone into); Described school current output terminal (I
The school goes out) through being connected to arteries and veins the 3rd live wire input end (L behind first isolation circuit (3)
Arteries and veins goes into 3), arteries and veins the 3rd live wire output terminal (L
Arteries and veins goes out 3) be connected to and show current output terminal (I
Show out).
6. as the multilist test unit of electric energy meter accuracy under claim 4 or the 5 described pulse train disturbed conditions, it is characterized in that: described first isolation circuit (3) comprises the electric capacity of magnet ring and ground connection, and second isolation circuit (5) comprises the electric capacity of magnet ring and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201808770U CN201673250U (en) | 2010-04-30 | 2010-04-30 | Electricity energy meter accuracy tester under condition of pulse train interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201808770U CN201673250U (en) | 2010-04-30 | 2010-04-30 | Electricity energy meter accuracy tester under condition of pulse train interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201673250U true CN201673250U (en) | 2010-12-15 |
Family
ID=43330662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201808770U Expired - Fee Related CN201673250U (en) | 2010-04-30 | 2010-04-30 | Electricity energy meter accuracy tester under condition of pulse train interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201673250U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393511A (en) * | 2011-11-04 | 2012-03-28 | 广东电网公司广州供电局 | Online error verification device and test method for electronic electric energy meter rapid transient pulse train |
| CN102411135A (en) * | 2011-12-11 | 2012-04-11 | 浙江省计量科学研究院 | Device and method for testing electrical fast transient/burst (EFT/B) immunity of electric energy meter |
| CN105093162A (en) * | 2015-08-07 | 2015-11-25 | 国家电网公司 | Method and device for calibrating measurement error of electric energy meter under pulse train interference condition |
| CN108919171A (en) * | 2018-06-29 | 2018-11-30 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault tester |
-
2010
- 2010-04-30 CN CN2010201808770U patent/CN201673250U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393511A (en) * | 2011-11-04 | 2012-03-28 | 广东电网公司广州供电局 | Online error verification device and test method for electronic electric energy meter rapid transient pulse train |
| CN102411135A (en) * | 2011-12-11 | 2012-04-11 | 浙江省计量科学研究院 | Device and method for testing electrical fast transient/burst (EFT/B) immunity of electric energy meter |
| CN105093162A (en) * | 2015-08-07 | 2015-11-25 | 国家电网公司 | Method and device for calibrating measurement error of electric energy meter under pulse train interference condition |
| CN108919171A (en) * | 2018-06-29 | 2018-11-30 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault tester |
| CN108919171B (en) * | 2018-06-29 | 2023-12-26 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault check meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101871975B (en) | System and method for testing cable transfer impedance time domain | |
| CN102866375B (en) | System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device | |
| Cataliotti et al. | A novel approach to current transformer characterization in the presence of harmonic distortion | |
| CN103792508A (en) | Error test system and method for digitized metering device | |
| CN202854315U (en) | System for calibrating receiving performance of partial-discharge ultrahigh frequency detection device | |
| CN103913715B (en) | High-voltage measuring box error testing system and error testing method | |
| CN201673250U (en) | Electricity energy meter accuracy tester under condition of pulse train interference | |
| CN103487695A (en) | Detection device for merging unit based on analog input | |
| CN204142951U (en) | A kind of electric energy meter error calibration equipment | |
| Yuan et al. | Development and application of high-frequency sensor for corona current measurement under ultra high-voltage direct-current environment | |
| CN104459595A (en) | Oscilloscope checking system and method | |
| CN110780257A (en) | Direct current transformer detection system and detection method based on standard source | |
| CN107656226B (en) | HFCT electrical parameter test device and test method based on transmission coefficient | |
| CN103063926B (en) | A kind of method of testing of low-voltage power line narrowband carrier termination and proving installation | |
| CN205079787U (en) | Comprehensive tester metrological verification system and adapter and measurement test platform | |
| CN203433064U (en) | Detecting device based on analog quantity input combining unit | |
| CN108490380A (en) | A kind of voltage current transformer on-line testing system | |
| CN203661059U (en) | Parallel carrier wave communication tester | |
| CN106896270A (en) | A kind of measuring method of transmission line impedance | |
| WO2022252664A1 (en) | Wireless electrical sensor, and electrical parameter measurement and calculation apparatus, method and system | |
| CN106932746B (en) | Electronic current transformer performance test system and method | |
| CN105093011B (en) | A kind of electric vehicle alternating current-direct current charging pile calibrating conversion equipment | |
| CN104820199B (en) | Large direct current measuring device ripple response performance test system and method | |
| CN203629536U (en) | Transformer winding analyzer | |
| CN204556784U (en) | A kind of circuit module measures switching device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20130430 |