CN210720712U - Time base source applied to electric energy meter calibrating device - Google Patents
Time base source applied to electric energy meter calibrating device Download PDFInfo
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Abstract
The utility model discloses a time base source for electric energy meter calibrating installation, wherein, the time base source for electric energy meter calibrating installation includes a plurality of standard time base source host computers, signal identification selector, a plurality of standard time base source slave computers and a plurality of error calibrating units; the output ends of the plurality of standard time base source hosts are respectively connected with the input end of the signal identification selector; each standard time-base source host comprises a standard clock pulse TTL signal output end and a plurality of standard clock pulse differential signal output ends; a plurality of output ends of the signal identification selector are connected with input ends of a plurality of standard time-based source slave machines in a one-to-one correspondence manner; each standard time-base source slave machine comprises a standard clock pulse TTL signal input end, a standard clock pulse differential signal input end and a plurality of standard clock pulse TTL signal output ends, and the standard clock pulse TTL signal output ends of each standard time-base source slave machine are connected with a detection end of an error verification unit. The utility model discloses technical scheme has improved the reliability of electric energy meter error examination.
Description
Technical Field
The utility model relates to an electric energy meter error test technical field, in particular to time base source for electric energy meter calibrating installation.
Background
According to the JJG596 and 2012 electronic alternating current electric energy meter verification rules, an electric energy meter daily timing error test is carried out according to the electric energy meter requirement with the timing function. When a large number of electric energy meters are subjected to daily timing error test, standard clocks are required to be used for comparing the timing errors.
In the prior art, one or more paths of standard clock pulse TTL signals are output by a standard time base source to test the daily timing error of the electric energy meter, the time base source is transmitted by the TTL signals, and the signals are poor in transmission distance and anti-interference performance and cannot be transmitted in a long distance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a time base source of being applied to electric energy meter calibrating installation aims at improving the reliability of electric energy meter error examination.
In order to achieve the above object, the present invention provides a time-base source for an electric energy meter calibrating device, wherein the time-base source for the electric energy meter calibrating device comprises a plurality of standard time-base source hosts, a signal identification selector, a plurality of standard time-base source slaves and a plurality of error calibrating units;
the output ends of a plurality of standard-time base source hosts are respectively connected with the input end of the signal identification selector; each standard time-based source host comprises a standard clock pulse TTL signal output end and a plurality of standard clock pulse differential signal output ends, and is used for respectively outputting a standard clock pulse TTL signal and a plurality of standard clock pulse differential signals;
the signal identification selector is provided with a plurality of output ends, and the plurality of output ends of the signal identification selector are connected with the input ends of a plurality of standard time-based source slave machines in a one-to-one correspondence manner; the signal identification selector is used for identifying a plurality of standard clock pulse differential signals output by each standard time-base source host and outputting pulse differential signals meeting preset standard frequency to the standard time-base source slave;
each standard time-based source slave machine comprises a standard clock pulse TTL signal input end, a standard clock pulse differential signal output end and a plurality of standard clock pulse TTL signal output ends, and the plurality of standard clock pulse TTL signal output ends of each standard time-based source slave machine are connected with a detection end of one error verification unit; each standard time-base source slave machine is used for driving and converting the standard clock pulse differential signals output by the signal selection identifier so as to output a plurality of standard clock pulse TTL signals to the corresponding error verification units;
each error detection unit is used for calculating the error of daily timing of the standard clock pulse TTL signals and the pulse differential signals of the detected electric energy meter respectively.
Optionally, the time-base source applied to the electric energy meter calibrating device further comprises an alarm unit, and the signal identification selector is further configured to send an alarm signal when the standard clock pulse differential signal output by the standard time-base source host is identified to be abnormal, and switch to the standard time-base source host when the output standard clock pulse signal meets the preset standard frequency.
Optionally, the alarm unit is an indicator light or a buzzer.
Optionally, the preset standard frequency is 100KHZ or 500 KHZ.
Optionally, the standard clock TTL signal output end of the standard time-based source master is configured to output a standard clock TTL signal to the standard time-based source slave or the error verification unit.
Optionally, the number of standard clock pulse differential signal outputs is greater than or equal to 4.
Optionally, the standard-time-based source master, the signal identification selector and the standard-time-based source slave are connected by a twisted pair shielded wire.
Optionally, the number of standard-time base source hosts is 1-3.
The utility model discloses technical scheme includes a plurality of standard time base source host computers, signal identification selector, a plurality of standard time base source slave computers and a plurality of error verification units through being applied to electric energy meter calibrating installation's time base source, through standard time base source host computer output standard clock pulse TTL signal and a plurality of standard clock pulse difference signal respectively, standard clock pulse TTL signal that standard time base source host computer output can directly output to standard time base source slave computers, or standard time base source host computer directly outputs standard clock pulse TTL signal to error verification unit; a plurality of standard clock pulse differential signals output by the standard time base source host computer are output to the standard time base source slave computer through the signal identification selector. The signal identification selector identifies a standard clock pulse differential signal output by the standard time base source host, and when the standard clock pulse differential signal output by the time base source host meets a preset standard frequency, the standard clock pulse differential signal output by the standard time base source host is considered to meet the pulse frequency requirement required by the current detected electric energy meter for daily timing error, and the clock pulse differential signal is output to a corresponding standard time base source slave; and when the standard clock pulse differential signal output by the time base source host does not meet the preset standard frequency, judging that the standard time base source host is abnormal. It can be understood that the standard-time-base source slave machine is used as a relay driving device in the scheme, namely, a high-frequency constant-temperature crystal with high precision and high stability is not required to be equipped as a reference, and a standard clock pulse differential signal output by the standard-time-base source master machine is directly used as a signal reference for relay driving. The standard-time base source slave machine can enhance the driving capability of a standard clock pulse differential signal output by the standard-time base source host machine so as to drive the standard-time base source slave machine to convert and output a plurality of standard clock pulse TTL signals to corresponding error verification units, and the error verification units respectively carry out daily timing error calculation on the plurality of standard clock pulse TTL signals and the pulse differential signal of the electric energy meter so as to achieve the purpose of judging whether the detected electric energy meter meets the standard of 'clock daily timing error' of 'metering performance' in the JJJG 596-2012 electronic alternating current electric energy meter verification regulation. The utility model discloses technical scheme has improved the reliability of electric energy meter error examination.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a time-base source applied to an electric energy meter calibration device according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a standard time-based source host applied to a time-based source of the verification apparatus of the electric energy meter in FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of a standard time-base source of the apparatus of FIG. 1;
fig. 4 is a schematic structural diagram of an embodiment of a reference time source slave machine in a time base source applied to an electric energy meter calibrating device.
The reference numbers illustrate:
the realization, the functional characteristics and the feasible points of the utility model are further explained by referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a be applied to time base source of electric energy meter calibrating installation is applied to electronic type alternating current electric energy meter, and electronic type alternating current electric energy meter indicates the alternating current electric energy meter who constitutes measuring circuit with the electronic device, and its electric current and voltage act on solid-state component electronic element, and is directly proportional with the electric energy of production in the certain period. In the JJG596-2012 electronic alternating current electric energy meter verification rule, an electric energy meter daily timing error test is carried out according to the electric energy meter requirement with the timing function. When a large number of electric energy meters are subjected to daily timing error test, standard clocks are required to be used for comparing the timing errors. However, in the prior art, when testing the daily timing error, one or more standard clock pulse TTL signals are output by a standard time base source to test the daily timing error of the electric energy meter, and the time base source transmits by the TTL signals, so that the signals are poor in transmission distance and anti-interference performance and cannot be transmitted in a longer distance.
Furthermore, the time-based source is periodically checked every year according to the rules of the metering, and if a standard-time-based source must be provided for each test unit or for every few test units, the time-based source is a huge number and costs a large amount of tests.
In order to solve the above problem, in an embodiment of the present invention, referring to fig. 1, the time-base source applied to the electric energy meter calibration apparatus includes a plurality of standard time-base source hosts 10, a signal identification selector 20, a plurality of standard time-base source slaves 30, and a plurality of error calibration units 40;
the output ends of a plurality of standard-time-base source hosts 10 are respectively connected with the input end of the signal identification selector 20; each of the standard-time-based source hosts 10 includes a standard clock TTL signal output terminal and a plurality of standard clock differential signal output terminals, and is configured to output a standard clock TTL signal and a plurality of standard clock differential signals, respectively;
the signal identification selector 20 has a plurality of output ends, and the plurality of output ends of the signal identification selector 20 are connected with the input ends of a plurality of standard time-based source slave machines 30 in a one-to-one correspondence manner; the signal identification selector 20 is configured to identify a plurality of standard clock differential signals output by each standard-time-based source master 10, and output a pulse differential signal meeting a preset standard frequency to the standard-time-based source slave 30;
each of the standard time-based source slaves 30 includes a standard clock TTL signal input terminal, a standard clock differential signal output terminal and a plurality of standard clock TTL signal output terminals, and the plurality of standard clock TTL signal output terminals of each of the standard time-based source slaves 30 are connected to a detection terminal of the error verification unit 40; each standard clock source slave 30 is configured to perform driving conversion on the standard clock differential signal output by the signal selection identifier to output a plurality of standard clock TTL signals to the corresponding error verification units 40;
each error verification unit 40 is configured to perform daily timing error calculation on the plurality of standard clock TTL signals and the pulse differential signals of the electric energy meter to be detected.
In the embodiment, compared with the prior art that one or more paths of standard clock pulse TTL signals are output by one standard time base source to test the daily timing error of the electric energy meter, the present scheme adopts the standard time base source host 10 to output a plurality of standard clock pulse differential signals, the signals are identified and output to the standard time base source slave 30 by the signal identification selector 20, and then the standard time base source slave 30 drives to convert the input standard clock pulse differential signals into a plurality of standard clock pulse TTL signals to the error verification unit 40, so as to test the daily timing error of the electric energy meter, so that the interference from the standard time base source output to the error verification unit 40 is smaller, the long-distance transmission is realized, the use of the standard time base source host 10 is also reduced, and the cost is reduced.
In this embodiment, one time-base source master may output a plurality of standard clock differential signals, and the output standard clock differential signals are screened by the signal identification selector 20 to be output to the corresponding time-base source slave 30. This solves the problem of having to provide a standard-time-based source for each assay unit or for each of several assay units, thereby reducing the cost involved in the manufacturing process. It can be understood that the signal selection identifier is equivalent to a switch, and when the standard clock pulse differential signal output by the time-base source host meets the preset standard frequency, that is, when the standard clock pulse differential signal output by the standard time-base source host 10 meets the pulse frequency requirement required for the daily timing error of the currently detected electric energy meter, the clock pulse differential signal is output to the corresponding standard time-base source slave 30; when the standard clock pulse differential signal output by the time base source master does not meet the preset standard frequency, it is determined that the standard time base source master 10 is abnormal, and the connection between the standard time base source master 10 and the standard time base source slave 30 is cut off, i.e. the abnormal standard clock pulse differential signal is not allowed to be output to the standard time base source slave 30.
It should be noted that, one standard time base source master 10 outputs a plurality of standard clock pulse differential signals, and a plurality of outputs of the signal identification selector 20 are connected to the standard time base source slaves 30 in a one-to-one correspondence, that is, the standard time base source master 10 outputs the standard clock pulse differential signal meeting the preset standard frequency to a corresponding standard time base source slave 30. It can be understood that, since the standard clock pulse differential signal is input from the time-base source slave 30, the standard time-base source slave 30 may not need to be equipped with a high-frequency oven crystal with high precision and high stability as a reference, and the standard time-base source slave 30 is directly used as a relay driving device, and the standard clock pulse differential signal output from the standard time-base source master 10 is used as a signal reference for relay driving. It is equivalent to using standard clock pulse differential signals to replace high-frequency constant temperature crystals for relay driving. Since the slave 30 does not need to be equipped with a high-precision and high-stability high-frequency constant temperature crystal as a reference when the standard time is standard, the cost consumed in the process of timing errors of the electric energy meter is also reduced.
It should be noted that the standard-time-based source slave 30 performs driving conversion on the standard clock differential signal output by the signal selection identifier 20, that is, the standard-time-based source slave 30 amplifies the driving capability of the standard clock differential signal output by the standard-time-based source master 10 to drive the standard-time-based source slave 30 to convert and output a plurality of standard clock TTL signals to the corresponding error verification units 40.
In this embodiment, after receiving the standard clock differential signal output by the signal identification selector 20, the slave 30 of the standard clock source amplifies the driving capability of the standard clock differential signal, that is, the driving capability of the standard clock differential signal is enhanced, so that the slave 30 of the standard clock source converts the input standard clock differential signal into a plurality of standard clock TTL signals and outputs the standard clock TTL signals to the error verification unit 40. After receiving the standard clock pulse TTL signals, the error verification unit 40 calculates the daily timing error of the standard clock pulse TTL signals and the pulse differential signals of the electric energy meter, respectively, so as to achieve the standard of determining whether the electric energy meter to be detected meets the "clock daily timing error" of "metering performance" in the verification rule of the jjjg 596-2012 electronic ac electric energy meter.
In the above embodiment, the "standard" means that in the electronic ac electric energy meter verification procedure of jjjg 596-2012, for the "clock daily timing error" of the metering performance, the requirement for the daily timing error of the second pulse signal of the electric energy meter to be detected is ± 0.5s/d, and the value is reduced to 5.787 × 10-6 as the relative error. In order to accurately measure the daily timing error of the electric energy meter to be detected, the standard clock tester in the verification condition controlled by the metering device is required to verify the standard clock tester of the internal clock of the electric energy meter to be detected, the daily timing error limit is +/-0.05 s/d, and the value is reduced to 5.787 x 10-7, namely the relative error. For the verification method of measuring the daily timing error of the clock, after the electric energy meter to be detected is required to be preheated for 1 hour, the electric energy meter to be detected is continuously measured for 5 times by using a standard clock tester, the measuring time of each time is 1 minute, and the arithmetic mean value of the electric energy meter to be detected is taken as a test result. In the verification regulation of the electronic alternating current electric energy meter with jjjg 596-. It can be understood that the "standard" in the present scheme is a standard specified by the verification procedure of the electronic ac electric energy meter of JJG 596-2012.
The utility model discloses technical scheme includes a plurality of standard time base source host computers 10 through being applied to electric energy meter calibrating installation's time base source, signal identification selector 20, a plurality of standard time base source are followed machine 30 and a plurality of error verification unit 40, through standard time base source host computers 10 output standard clock pulse TTL signal and a plurality of standard clock pulse difference signal respectively, standard time base source host computers 10 output standard clock pulse TTL signal can directly output to standard time base source from machine 30, or standard time base source host computers 10 directly output standard clock pulse TTL signal to error verification unit 40; the plurality of standard clock differential signals outputted from the standard time-based source master are outputted to the standard time-based source slave 30 through the signal identification selector 20. The signal identification selector 20 identifies the standard clock pulse differential signal output by the time-base source master, and when the standard clock pulse differential signal output by the time-base source master meets the preset standard frequency, that is, when the standard clock pulse differential signal output by the standard time-base source master 10 meets the pulse frequency requirement required by the current detected electric energy meter for daily timing error, the clock pulse differential signal is output to the corresponding standard time-base source slave 30; when the standard clock pulse differential signal output by the time-base source host does not meet the preset standard frequency, it is determined that the standard time-base source host 10 is abnormal. It is understood that the standard-time-based source slave 30 is used as a relay driving device in the scheme, that is, a high-frequency oven crystal with high precision and high stability is not required to be equipped as a reference, and the standard clock pulse differential signal output by the standard-time-based source master 10 is directly used as a signal reference for relay driving. The standard-time-based source slave 30 can amplify the driving capability of the standard clock pulse differential signal output by the standard-time-based source host 10 to drive the standard-time-based source slave 30 to convert and output a plurality of standard clock pulse TTL signals to the corresponding error verification unit 40, and the error verification unit 40 performs daily timing error calculation on the plurality of standard clock pulse TTL signals and the pulse differential signal of the electric energy meter respectively, so as to achieve the standard of "clock daily timing error" for judging whether the electric energy meter to be detected meets the "metering performance" in the verification rule of the JJG596-2012 electronic alternating current electric energy meter. The utility model discloses technical scheme has improved the reliability of electric energy meter error examination.
In an embodiment, the time base source applied to the electric energy meter verification device further comprises an alarm unit, the signal identification selector 20 is further configured to, when the standard clock pulse differential signal output by the standard time base source host 10 is identified to be abnormal, the alarm unit sends an alarm signal and switches to the standard time base source host 10 that outputs the standard clock pulse signal meeting a preset standard frequency.
In this embodiment, the alarm unit is an indicator light or a buzzer. It can be understood that, when the signal identification selector 20 identifies that the standard clock differential signal output by the standard-time source master 10 is abnormal, that is, the standard clock differential signal output by the standard-time source master 10 does not meet the preset standard frequency, the standard clock differential signal output by the standard-time source master 10 is not output to the standard-time source slave 30, and the indicator light flickers or the buzzer sounds to indicate that the standard-time source master 10 is abnormal. Further, when the signal identification selector 20 determines that the standard-time base source host 10 outputting the standard clock differential signal among the plurality of standard-time base source hosts 10 is abnormal, the remaining standard-time base source hosts 10 among the plurality of standard-time base source hosts 10 that meet the preset standard frequency are switched to, and the standard clock differential signal is output. Compared with the prior art, the calibration device stops operating when the time-based source fails, and the reliability of the time-based source applied to the electric energy meter calibration device is improved.
In the above embodiment, the predetermined standard frequency is 100KHZ or 500 KHZ. Furthermore, according to the standard of daily timing error verification of the electric energy meter to be detected, a stable standard pulse signal of 100KHZ or 500KHZ is required to be used for error verification, and then the pulse signal output by the standard time base source is in accordance with the error range of the pulse signal required by the verification standard, namely the preset standard frequency is 100KHZ or 500 KHZ.
In one embodiment, referring to fig. 2, the standard clock TTL signal output of the standard time-based source master 10 is used to output a standard clock TTL signal to the standard time-based source slave 30 or the error verification unit 40. It can be understood that the standard-time base source host 10 outputs the standard clock TTL signal to the error verification unit 40, which may be driven by the standard-time base source slave 30, so as to convert and output a plurality of standard clock TTL signals to the corresponding error verification unit 40, and the error verification unit 40 performs daily timing error calculation on the plurality of standard clock TTL signals and the pulse differential signal of the electric energy meter, respectively, so as to achieve the standard of determining whether the electric energy meter to be detected meets the "clock daily timing error" of "metering performance" in the verification procedure of the JJG596-2012 electronic ac electric energy meter.
The standard-time-base-source master 10 may output the standard clock TTL signal to the error verification unit 40, or may directly output the standard clock TTL signal to the error verification unit 40 without passing through the standard-time-base-source slave 30, and perform error calculation of daily timing.
In the above embodiment, the number of the standard clock pulse differential signal output terminals is greater than or equal to 4. It is understood that the number of the standard clock pulse differential signal outputs may be 4, 5, 6, etc., depending on the practical application scenario, and is not limited herein.
In the above embodiment, referring to fig. 3, the slave 30 includes a standard clock TTL signal input terminal, a standard clock differential signal output terminal, and a plurality of standard clock TTL signal output terminals. It can be understood that the standard-time-base source slave 30 has a standard-time-clock TTL signal input connected to the standard-time-clock TTL signal output by the standard-time-base source host 10; the standard-time-base source slave 30 has a standard-time-pulse differential signal input end connected to a standard-time-pulse differential signal output by the standard-time-base source master 10 and conforming to a preset standard frequency, and the standard-time-pulse differential signal is used as a signal reference for relay driving; the standard clock TTL signal output terminals output the standard clock TTL signals converted from the driving of the standard time-based source slave 30 to the error verification unit 40, and then the error verification unit 40 performs error calculation verification on the standard clock TTL signals output from the standard time-based source slave 30 and the pulse differential signals of the electric energy meter to be tested. Therefore, the reliability of error detection of the electric energy meter is improved.
In an embodiment, referring to fig. 4, since the normal-time-based source slave 30 is used as a relay driver, the signal selection identifier 20 outputs the standard-time-based source slave 30 to relay and enhance the driving capability of the input standard clock differential signal, and then outputs the standard clock differential signal with enhanced driving capability to the next standard-time-based source slave 30; the slave 30 of the next stage relays the driving capability of the input normal clock differential signal again. The standard-time-base source slave 30 performs a plurality of relay enhancements on the standard clock differential signal to perform an error calculation on the standard clock differential signal by the error verification unit 40. The slave 30 may also convert the input TTL signal into a differential signal and output the differential signal. The conversion of the input standard clock TTL signal by the standard-time-based source slave 30 is synchronized with the relay enhancement of the driving capability of the input standard clock differential signal by the standard-time-based source slave 30.
In one embodiment, the standard time-based source master 10, the signal identification selector 20 and the standard time-based source slave 30 are connected by a twisted pair shielded wire. Compared with the prior art in which TTL signals are directly used for transmission, the pulse differential signals have improved anti-interference capability in terms of electrical characteristics, and meanwhile, the twisted-pair shielding lines are used to realize ultra-long distance signal transmission, and the anti-interference capability and reliability of the transmitted signals can also be improved in the networking layout of the system.
In the above embodiment, the number of the standard-time-based source hosts 10 is 1 to 3. It is understood that when the number of the standard-time-based source hosts 10 is 3, one of the standard-time-based source hosts 10 may serve as the main standard-time-based source host 10, and the other two may serve as the standby standard-time-based source hosts 10; when the number of the standard-time-base source hosts 10 is 2, one of the standard-time-base source hosts 10 may serve as a main standard-time-base source host 10, and the other may serve as a backup standard-time-base source host 10. Since the time-based source is periodically checked every year according to the regulations of the metering law, when the time-based source needs to be checked, one or two standard time-based source hosts 10 in the system are reserved to operate in the system, and the rest standard time-based source hosts 10 are checked. In the scheme, one or two standard time base source hosts 10 can be kept to operate in the device, and the rest standard time base source hosts 10 are subjected to inspection, so that the condition that the operation of the verification device stops in the inspection process can not be caused.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (8)
1. The time base source applied to the electric energy meter calibrating device is characterized by comprising a plurality of standard time base source main machines, a signal identification selector, a plurality of standard time base source slave machines and a plurality of error calibrating units;
the output ends of a plurality of standard-time base source hosts are respectively connected with the input end of the signal identification selector; each standard time-based source host comprises a standard clock pulse TTL signal output end and a plurality of standard clock pulse differential signal output ends, and is used for respectively outputting a standard clock pulse TTL signal and a plurality of standard clock pulse differential signals;
the signal identification selector is provided with a plurality of output ends, and the plurality of output ends of the signal identification selector are connected with the input ends of a plurality of standard time-based source slave machines in a one-to-one correspondence manner; the signal identification selector is used for identifying a plurality of standard clock pulse differential signals output by each standard time-base source host and outputting pulse differential signals meeting preset standard frequency to the standard time-base source slave;
each standard time-based source slave machine comprises a standard clock pulse TTL signal input end, a standard clock pulse differential signal output end and a plurality of standard clock pulse TTL signal output ends, and the plurality of standard clock pulse TTL signal output ends of each standard time-based source slave machine are connected with a detection end of one error verification unit; each standard time-base source slave machine is used for driving and converting the standard clock pulse differential signals output by the signal identification selector so as to output a plurality of standard clock pulse TTL signals to the corresponding error verification units;
each error detection unit is used for calculating the error of daily timing of the standard clock pulse TTL signals and the pulse differential signals of the detected electric energy meter respectively.
2. The time base source applied to the electric energy meter verification device according to claim 1, wherein the time base source applied to the electric energy meter verification device further comprises an alarm unit, the signal identification selector is further configured to issue an alarm signal when the standard clock pulse differential signal output by the standard time base source host is identified to be abnormal, and the alarm unit switches to the standard time base source host outputting the standard clock pulse signal meeting a preset standard frequency.
3. The time-based source applied to the electric energy meter calibration device as claimed in claim 2, wherein the alarm unit is an indicator light or a buzzer.
4. The time-based source applied to the electric energy meter calibrating device according to claim 1, wherein the preset standard frequency is 100KHZ or 500 KHZ.
5. The time-base source applied to the verification device of the electric energy meter according to claim 1, wherein the standard clock TTL signal output terminal of the standard time-base source host is used for outputting a standard clock TTL signal to the standard time-base source slave or the error verification unit.
6. The time-base source applied to the electric energy meter calibration device as claimed in claim 1, wherein the number of the standard clock pulse differential signal output ends is greater than or equal to 4.
7. The time-based source applied to the electric energy meter verification device as claimed in claim 1, wherein the time-based source master, the signal identification selector and the time-based source slave are connected by a twisted pair shielded wire.
8. The time-base source applied to the electric energy meter verification device as claimed in any one of claims 1 to 7, wherein the number of the time-base source hosts is 1 to 3.
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| CN201921258420.4U CN210720712U (en) | 2019-07-31 | 2019-07-31 | Time base source applied to electric energy meter calibrating device |
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| CN201921258420.4U CN210720712U (en) | 2019-07-31 | 2019-07-31 | Time base source applied to electric energy meter calibrating device |
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