CN104535821B - Work condition indicator - Google Patents
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- CN104535821B CN104535821B CN201410829243.6A CN201410829243A CN104535821B CN 104535821 B CN104535821 B CN 104535821B CN 201410829243 A CN201410829243 A CN 201410829243A CN 104535821 B CN104535821 B CN 104535821B
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Abstract
The present invention provides a kind of work condition indicator, belongs to field of information security technology.Work condition indicator provided by the invention, including Hall element, single-chip microcomputer and display screen, wherein, the Hall element is used to monitor the electric current for flowing through power line, and the voltage signal of a current in proportion with flowing through power line is exported, then it is supplied to single-chip microcomputer；The voltage signal that the single-chip microcomputer is provided Hall element is handled and shown on a display screen.The present invention flows through the electric current of power line so as to constantly grasp the workload of power line by Hall element monitoring, and the quiescent potential of the circuit in Tempest device is judged by working state monitoring circuit, its DC static operating point is seen whether in normal voltage range, so as to judge whether the work of Tempest device is normal.Simple in construction, small volume of the invention, it can effectively judge the working condition of Tempest device.
Description
Technical field
The present invention relates to a kind of work condition indicator, more particularly to a kind of it is used to make shape in Tempest device
State instruction device, belongs to field of information security technology.
Background technology
With the high speed development of social informatization, electronic message unit also constantly improves, so as to meet the daily life of people
The needs that information interconnects in work.But electronic message unit will produce certain electromagnetic radiation while information exchanges, from
And cause two kinds of results：The leakage interfered with installation electromagnetical information of electromagnetic wave, wherein electromagnetic wave interfere problem
The problem of being people's extensive concern, the time that it is found is more early, and electromagnetic compatibility (EMC) technology is exactly to solve electromagnetic wave
Interfere problem and caused, there now have been the theory and technical foundation of comparative maturity.The problem of electromagnetic information leakage
Just be taken seriously and pay close attention in recent decades, with electromagnetic wave interfere problem compared with, electromagnetic information leakage treatment technology
Information security field is more focused on, its security work to information causes serious threat.
Although electromagnetic information leakage protect and detection technique and electromagnetic compatibility technology be all using the radiation problem of electromagnetic wave as
Basis, but difference be present with general electromagnetic compatibility technology again in it.Electromagnetic information leakage protection is with detection technique compared with general
Electromagnetic compatibility problem, it is more focused on leakage of information caused by the weak electromagnetic wave radiation of electronic information technology equipment, and
In general electromagnetic compatibility problem focuses on the microwave radiation at work of electronic equipment and other electronic equipments is done
Disturb, it is indifferent to the information entrained by electromagnetic wave.In addition, processing electromagnetic information leakage protection is asked with test problems than electromagnetic compatibility
Topic more requires detection and the test equipment of specialty.Also, electromagnetic information leakage protects will follow TEMPEST marks with detection
It is accurate.In a word, electromagnetic information leakage protection is with detection technique compared with the electromagnetic interference problem of electronic equipment, and its technical requirements are more
Height, electromagnetic environment is more complicated, testing standard is stricter.
With the continuous development of internet, computer has become a part indispensable in people's life.But count
For calculation machine as a kind of information processing and the equipment exchanged, it can constantly radiate a large amount of electromagnetic wave signals when working into space.
This electromagnetic wave signal given off is possible to carry the important information that computer is being handled, so as to give information security issue band
Carry out huge hidden danger.At work, its mainboard, display and all kinds of interface data wires, cable etc. can all be sent out computer
Project the different degrees of electromagnetic radiation of intensity.The angle theoretical from electromagnetic radiation, these useful informations given off all may be used
It can be received and be reduced.
For relating computer, its same radiated electromagnetic wave at work, and security information therein be possible to by
Receive so as to decode, the leakage of this mode, bypassed computer fire wall and hardware isolated including it is a series of anti-
Shield measure.In this case, even if computer is not connected the data that can similarly be stolen with any other equipment, so not having
It is difficult to block passage of divulging a secret to have the computer by special electromagnetic information safety and Protection to be.In general, computer
Primary radiation source concentrate on cable part, if its cable can not provide effective shielding or filtering, the spoke of its electromagnetic leakage
Penetrating intensity will greatly enhance.
The content of the invention
To overcome shortcoming present in prior art, goal of the invention of the invention is to provide a kind of working condition instruction dress
Put, it can effectively judge the working condition of Tempest device, and then effectively prevent power supply beta radiation and led
The leakage of information of cause.
To realize the goal of the invention, the present invention provides a kind of work condition indicator, including Hall element, single-chip microcomputer
And display screen, wherein, the Hall element is used to monitor the electric current for flowing through power line, and exports an electricity with flowing through power line
Proportional voltage signal is flowed, is then supplied to single-chip microcomputer；The voltage signal that the single-chip microcomputer is provided Hall element is carried out
Handle and shown on a display screen.
Preferably, work condition indicator also includes working state monitoring circuit, and the working state monitoring circuit is used
Whether the quiescent potential of the circuit in Tempest device judges, see its DC static operating point in normal electricity
In the range of pressure.
Preferably, work condition indicator also includes clock chip, and the clock chip is used to provide the current time
Information, single-chip microcomputer show current date Hour Minute Second and anti-letter on a display screen always according to the temporal information that clock chip provides
Cease the working time of leakage device.
Preferably, the circuit in the Tempest device is white noise amplifying circuit.
Preferably, the white noise amplifying circuit comprises at least two-stage.
Preferably, the white noise amplifying circuit is three-level.
Compared with prior art, work condition indicator provided by the invention can effectively judge that Tempest fills
The working condition put, and then effectively prevent power supply beta radiation and conduct caused leakage of information.
Brief description of the drawings
Fig. 1 provides the composition frame chart of Tempest device for the present invention；
Fig. 2 is the circuit diagram of noise generating device provided by the invention；
Fig. 3 is the composition frame chart of work condition indicator provided by the invention；
Fig. 4 is the circuit diagram of white noise acoustic amplifier provided by the invention；
Fig. 5 is the circuit diagram of working state monitoring circuit provided by the invention；
Fig. 6 is the circuit diagram of low pass filter provided by the invention.
Embodiment
The invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 provides the composition frame chart of Tempest device for the present invention.As shown in figure 1, anti-information provided by the invention
Leakage device, including power-supply filter, AC/DC converters, noise-producing equipment, amplifier, low pass filter and working condition
Monitoring and display device (i.e. work condition indicator), the power-supply filter, which is used to filter out power line carrier on power line, to be believed
Breath, it is preferable that the stopband operating frequency range of power-supply filter is 150KHz to 400MHz；AC/DC converters are used for from electric power
Taking-up AC power on line is simultaneously converted into dc source, main generation+5V and+7V dc sources, is sent out for follow-up noise
Generating apparatus, amplifier, working condition and display device provide dc source.The noise-producing equipment is used to produce white noise；
The amplifier is used for white noise acoustic intelligence produced by amplifying noise-producing equipment；The low pass filter is used to put amplifier
Big white noise acoustic intelligence is filtered, it is preferable that the passband operating frequency range of low pass filter is 0MHz to 300MHz；It is described
White noise is coupled on power line by coupler, and the coupler is inductive coupler or capacity coupler.
Fig. 2 is the circuit diagram of noise generating device provided by the invention.As shown in Fig. 2 noise provided by the invention produces
Device includes low pass filter and white noise generator, and the low pass filter is by inductance L5, electric capacity C9, electric capacity C15 and electric capacity
C16 is formed, and the cathode output end of+7V direct current supply lines connects the first end of the inductance L5, and inductance L5 the second end is all connected with
Electric capacity C9, electric capacity C15 and electric capacity C16 first end, electric capacity C9, electric capacity C15 and electric capacity C16 the second end ground connection；Inductance L5's
Second end is connected to resistance R3 first end, and resistance R3 the second end is connected to the transmitting of the transistor Q1 in white noise generator
Pole, that is to say, that the low-pass filtered device of+7V power supplys filters out ripple and then provides electric energy to white noise generator.The inductance L5
Logical direct current is exchanged for hindering.The present invention uses the electric capacity C9 of a Large Copacity, and the electric capacity C15 and electric capacity of two low capacities
The mode that C16 is in parallel substantially increases the filtering characteristic of ripple.White noise sound generation device is made up of transistor Q1, transistor Q1
Base earth, colelctor electrode is hanging, and emitter stage connects current-limiting resistance R3 the second end, while is connected to the first of coupled capacitor C17
End, i.e., be provided out white noise acoustic intelligence by coupled capacitor C17.White noise generator produces wideband using the breakdown characteristics of PN junction
The white noise of band.
Fig. 3 is the composition frame chart of work condition indicator provided by the invention.As shown in figure 3, working condition instruction dress
Put including single-chip microcomputer, LCDs, clock chip, Hall element and working state monitoring circuit, can show the working time,
Flow through the electric current of power-supply filter and current working condition.The Hall element is used to monitor the electric current for flowing through power line,
And the voltage signal of a current in proportion with flowing through power line is exported, then it is supplied to single-chip microcomputer；Working state monitoring electricity
Road is mainly that anti-information is judged the quiescent potential of the white noise acoustic amplifier in Tempest device, sees its direct-current static
Whether state operating point is in normal voltage range；Single-chip microcomputer mainly handles the information and working state monitoring circuit of Hall element output
The information of output, and shown on LCDs, it is additionally operable to show the working condition of white noise acoustic amplifier；Clock chip
For providing current temporal information, single-chip microcomputer is worked as always according to the temporal information that clock chip provides in liquid crystal display screen display
Preceding date Hour Minute Second and the working time of the present apparatus.
Fig. 4 is the circuit diagram of white noise acoustic amplifier provided by the invention.As shown in figure 4, white noise provided by the invention is put
Big device includes three-level, and the amplifier is used to amplify white noise acoustic intelligence caused by noise generator, and third stage amplifier is right successively
White noise acoustic intelligence is amplified.First order amplifier, for amplifying white noise signal caused by noise generating device, after amplification
It is supplied to second level amplifier to continue to amplify, it is made up of the first amplification chip MAR-8+ and its peripheral circuit, wherein, first puts
Large chip MAR-8+ the 1st pin connection coupled capacitor C17 the second end, the 2nd and 4 pin ground connection, the 3rd pin connection coupled capacitor C18
First end, coupled electric capacity C18 to second level amplifier provide drive signal；Power supply+5V is successively through biasing resistor R1 simultaneously
Suitable quiescent point is provided to amplification chip MAR-8+ with inductance L6, electric capacity C11 and C12 play ac short circuit ground connection.
Second level amplifier be used for amplify the white noise signal that first order amplifier is amplified, be supplied to after amplification third level amplifier after
Continuous amplification, it is made up of the second amplification chip MAR-8+ and its peripheral circuit, wherein, the second amplification chip MAR-8+ the 1st pin
Connect coupled capacitor C18 the second end, the 2nd and 4 pin ground connection, the 3rd pin connection coupled capacitor C19 first end, coupled electric capacity
C19 provides drive signal to third level amplifier；Power supply+5V is successively through biasing resistor R2 and inductance L7 to amplification chip simultaneously
MAR-8+ provides suitable quiescent point, and electric capacity C13 and C14 play ac short circuit ground connection, and electric capacity C10 is used to filter out+5V
The ripple of power supply.Third level amplifier is used to amplify the white noise signal that second level amplifier is amplified, after being supplied to after amplification
Level low pass filter is filtered, and it is made up of the 3rd amplification chip MAR-8+ and its peripheral circuit, wherein, the 3rd amplification chip
MAR-8+ the 1st pin connection coupled capacitor C23 the second end, electric capacity C23 first end are connected to resistance R9 the second end, resistance
R9 first end is connected to electric capacity C19 the second end；Resistance R9 is used to control power output；The of 3rd amplification chip MAR-8+
2 and 4 pin are grounded, and the 3rd pin connection coupled capacitor C24 first end, coupled electric capacity C24 provides signal to low pass filter；Together
When power supply+5V give amplification chip MAR-8+ to provide suitable quiescent point, electric capacity C21 through biasing resistor R4 and inductance L8 successively
Play ac short circuit ground connection with C22, electric capacity C20 is used for the ripple for filtering out+5V power supplys.
Fig. 5 is the circuit diagram of working state monitoring circuit provided by the invention.As shown in figure 5, work provided by the invention
Status monitoring circuit：Comparator, level translator and indicator, the comparator are respectively compared each of the three-level in amplifier
With threshold values to judge whether every grade of amplifier operation is normal, level translator is used to provide threshold values electricity the quiescent point voltage of level
Pressure, and comparative result is converted into high level or low level；Indicator is used for whether normal, the indicator lamp of indicating magnifier work
When bright, represent working properly, when indicator lamp does not work, represent that work is abnormal.Comparator is established by cable including the first electric switch, second
Pass, the 3rd electric switch, the 4th electric switch, the 5th electric switch and the 6th electric switch, wherein, the first electric switch is by transistor Q4, electricity
R14, resistance R16 and diode D5 compositions are hindered, transistor Q4 emitter stage is connected to power supply+5V through resistance R14, and colelctor electrode is through electricity
Resistance R16 is connected to ground, is also attached to diode D5 negative pole, and base stage is connected to the test side of the first order amplifier in amplifier
DT1；Diode D5 positive pole is connected to the input of level translator, i.e. resistance R7 and resistance R10 intermediate node；Second electricity
Switch is made up of transistor Q5, resistance R17, resistance R21 and diode D8, and transistor Q5 emitter stage is connected to through resistance R17
Power supply+5V, colelctor electrode are connected to ground through resistance R21, are also attached to diode D8 negative pole, and base stage is connected to the in amplifier
The test side DT2 of two-stage amplifier；Diode D8 positive pole is connected to the input of level translator, i.e. resistance R7 and resistance
The intermediate node that R10 is in series；3rd electric switch is made up of transistor Q6, resistance R18, resistance R22 and diode D9, transistor
Q6 emitter stage is connected to power supply+5V through resistance R18, and colelctor electrode is connected to ground through resistance R22, is also attached to the negative of diode D9
Pole, base stage are connected to the test side DT3 of the third level amplifier in amplifier；Diode D9 positive pole is connected to level translator
Input, i.e. the intermediate node that resistance R7 and resistance R10 are in series.4th electric switch is made up of diode D1, diode D1
Negative pole be connected to the test side DT1 of the first order amplifier in amplifier, positive pole is connected to the input of level translator, i.e.,
Resistance R7 and resistance R10 intermediate node；5th electric switch is made up of diode D2, and diode D2 negative pole is connected to amplifier
In second level amplifier test side DT2, positive pole is connected to the input of level translator, i.e. resistance R7 and resistance R10's
Intermediate node.6th electric switch is made up of diode D3, and diode D3 negative pole is connected to the third level amplifier in amplifier
Test side DT3, positive pole is connected to the input of level translator, the i.e. intermediate node that resistance R7 and resistance R10 are in series.
Level translator is by resistance R7, resistance R10, electric capacity C26, transistor Q2, resistance R5, resistance R8, resistance R11, electricity
R13, transistor Q3 and resistance R6 compositions are hindered, wherein, resistance R7 and R10 are in series, and are connected between power supply+5V and ground, its
Intermediate node is the input of level translator, and electric capacity C26 is simultaneously connected in resistance R10 both ends, for filtering out ripple, to prevent malfunction
Make.Resistance R5 and R8 are in series, and are connected between power supply+5V and ground, and wherein intermediate node provides for transistor Q2 emitter stage
One suitable quiescent point, transistor Q2 colelctor electrode are grounded through resistance R13, and base stage is connected to resistance R7 and gone here and there with R10 phases
The intermediate node of connection.Transistor Q3 works on off state, and its colelctor electrode is connected to power supply+5V through resistance R6, grounded emitter,
Base stage is connected to transistor Q2 colelctor electrode through resistance R11.
Amplification chip MAR-8+ quiescent point is in 2.8-4V, in normal operating conditions, when first order amplifier
During normal work, it is connected to that DT1 transistor Q4 is in the conduction state, and diode D5 is in cut-off state, diode D1 is in
Cut-off state, the intermediate node voltage that resistance R7 and R10 are in series is unaffected, and transistor Q2 is in cut-off state, resistance R13
The voltage at both ends is zero, and transistor Q3 is also at cut-off state, R6 and R23 intermediate node voltages are+5V, is one of single-chip microcomputer
Input provides high level, while light emitting diode D13 connects electricity and lighted, and represents that first order amplifier operation is normal.When first
When amplifier MAR-8+ quiescent point is higher than 4V, in abnormal operating state, the diode D1 for being connected to DT1 is in and cut
Only state, transistor Q4 are in cut-off state, and diode D5 is in the conduction state, the intermediate node that resistance R7 and R10 are in series
Voltage is influenceed to become smaller than+2V by Q4 cut-offs, and transistor Q2 is in the conduction state, and the voltage at resistance R13 both ends is more than 1V, brilliant
Body pipe Q3 is in saturation conduction state, R6 and R23 intermediate node voltages are less than 1V, and low electricity is provided for an input of single-chip microcomputer
It is flat, while light emitting diode D13 power-off, without luminous, expression first order amplifier operation is abnormal；When the first amplification chip
When MAR-8+ quiescent point is less than 2.8V, in abnormal operating state, the diode D1 for being connected to DT1 is on shape
State, transistor Q4 is in the conduction state, and diode D5 is in cut-off state, the intermediate node voltage that resistance R7 and R10 are in series
Influenceed to become smaller than+3.5V by D1 conductings, transistor Q2 is in the conduction state, and the voltage at resistance R13 both ends is more than 1V, crystal
Pipe Q3 is in saturation conduction state, R6 and R23 intermediate node voltages are less than 1V, and low electricity is provided for an input of single-chip microcomputer
It is flat, while light emitting diode D13 power-off, without luminous, expression first order amplifier operation is abnormal.
When second level normal amplifier operation, it is connected to that DT2 transistor Q5 is in the conduction state, and diode D8 is in
Cut-off state, diode D2 are in cut-off state, and the intermediate node voltage that resistance R7 and R10 are in series is unaffected, transistor
Q2 is in cut-off state, and the voltage at resistance R13 both ends is zero, and transistor Q3 is also at cut-off state, R6 and R23 intermediate nodes electricity
Press as+5V, provide high level for an input of single-chip microcomputer, while light emitting diode D13 connects electricity and light, the expression second level
Amplifier operation is normal.When the second amplification chip MAR-8+ quiescent point is higher than 4V, in abnormal operating state, connect
The diode D2 for being connected to DT2 is in cut-off state, and transistor Q5 is in cut-off state, and diode D8 is in the conduction state, resistance
The intermediate node voltage that R7 and R10 are in series is influenceed to become smaller than+2V by Q5 cut-offs, and transistor Q2 is in the conduction state, electricity
The voltage at resistance R13 both ends is more than 1V, and transistor Q3 is in saturation conduction state, R6 and R23 intermediate node voltages are less than 1V, for list
One input of piece machine provides low level, while light emitting diode D13 power-off represents second level amplifier operation without lighting
It is abnormal；When the second amplification chip MAR-8+ quiescent point is less than 2.8V, in abnormal operating state, it is connected to
DT2 diode D2 is in the conduction state, and transistor Q5 is in the conduction state, and diode D8 is in cut-off state, resistance R7 and
The intermediate node voltage that R10 is in series is influenceed to become smaller than+3.5V by D2 conductings, and transistor Q2 is in the conduction state, resistance
The voltage at R13 both ends is more than 1V, provides low level for an input of single-chip microcomputer, while transistor Q3 is in saturation conduction shape
State, R6 and R23 intermediate node voltages are less than 1V, and light emitting diode D13 power-off is without luminous, and expression second level amplifier operation is not
Normally.
When third level normal amplifier operation, it is connected to that DT3 transistor Q6 is in the conduction state, and diode D9 is in
Cut-off state, diode D3 are in cut-off state, and the intermediate node voltage that resistance R7 and R10 are in series is unaffected, transistor
Q2 is in cut-off state, and resistance R13 both end voltages are zero, and transistor Q3 is also at cut-off state, R6 and R23 intermediate node voltages
For+5V, high level is provided for an input of single-chip microcomputer, while light emitting diode D13 connects electricity and lighted, and represents that the third level is put
Big device is working properly.When the 3rd amplification chip MAR-8+ quiescent point is higher than 4V, in abnormal operating state, connection
Cut-off state is in DT3 diode D3, transistor Q6 is in cut-off state, and diode D9 is in the conduction state, resistance R7
Influenceed to become smaller than+2V by Q6 cut-offs with the intermediate node voltage that R10 is in series, transistor Q2 is in the conduction state, resistance
The voltage at R13 both ends is more than 1V, and transistor Q3 is in saturation conduction state, R6 and R23 intermediate node voltages are less than 1V, is monolithic
One input of machine provides low level, while light emitting diode D13 power-off, without luminous, expression second level amplifier operation is not
Normally；When the 3rd amplification chip MAR-8+ quiescent point is less than 2.8V, in abnormal operating state, DT3 is connected to
Diode D3 it is in the conduction state, transistor Q6 is in the conduction state, and diode D9 is in cut-off state, resistance R7 and R10
The intermediate node voltage being in series is influenceed to become smaller than+3.5V by D3 conductings, and transistor Q2 is in the conduction state, resistance R13
The voltage at both ends is more than 1V, and transistor Q3 is in saturation conduction state, R6 and R23 intermediate node voltages are less than 1V, is single-chip microcomputer
An input low level is provided, while light emitting diode D13 power-off represents third level amplifier operation not just without luminous
Often.
Fig. 6 is the circuit diagram of low pass filter provided by the invention, as shown in fig. 6, low pass filter provided by the invention
For 7 rank Chebyshev filters, by inductance L10, inductance L11, inductance L9, inductance L12, electric capacity C27, electric capacity C28, electric capacity C29,
Electric capacity C25 is formed.Due to noise signal, broader bandwidth, if without restriction, it is likely that influence it caused by triode breakdown
Its signal, then after noise is produced, by it by low pass filter, its bandwidth is set to limit within the specific limits, the present invention
It is preferred that passband operating frequency range is 0MHz to 300MHz.
Elaborated with reference to design of the accompanying drawing to the present invention and example above, but those skilled in the art should recognize
Know, on the premise of without departing from present inventive concept, any modifications and variations made based on the present invention still fall within this hair
Content in bright protection domain.
Claims (2)
1. a kind of work condition indicator of Tempest device, it is characterised in that including Hall element, single-chip microcomputer, show
Display screen and working state monitoring circuit, wherein, the Hall element, which is used to monitor, flows through the electric current of power line, and export one with
The voltage signal of the current in proportion of power line is flowed through, is then supplied to single-chip microcomputer；The single-chip microcomputer is provided Hall element
Voltage signal handled and shown on a display screen；The working state monitoring circuit is used to fill Tempest
The quiescent potential of circuit in putting is judged, judges its DC static operating point whether in normal voltage range, described
Circuit in Tempest device is white noise amplifying circuit；The white noise amplifying circuit is three-level；Working state monitoring
Circuit includes：Comparator, level translator and indicator, the comparator is respectively by the every of the three-level in white noise amplifying circuit
The quiescent point voltage of one-level is compared with threshold values to judge whether every grade of amplifier operation is normal, and level translator is used for
Threshold voltage is provided, and comparative result is converted into high level or low level；Indicator is used to indicate white noise amplifying circuit
Whether work is normal；Comparator includes the first electric switch and the second electric switch, wherein, the first electric switch is by the first transistor,
One resistance, second resistance and the first diode composition, the emitter stage of the first transistor are connected to power supply, colelctor electrode through first resistor
Ground is connected to through second resistance, is also attached to the negative pole of the first diode, base stage is connected to the test side of amplifier；One or two pole
The positive pole of pipe is connected to the input of level translator；Second electric switch is made up of the second diode, the negative pole of the second diode
The test side of amplifier is connected to, positive pole is connected to the input of level translator.
2. work condition indicator according to claim 1, it is characterised in that also including clock chip, the clock
Chip is used to provide current temporal information, and single-chip microcomputer is shown on a display screen always according to the temporal information that clock chip provides works as
Preceding date Hour Minute Second and the working time of Tempest device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410829243.6A CN104535821B (en) | 2014-12-29 | 2014-12-29 | Work condition indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410829243.6A CN104535821B (en) | 2014-12-29 | 2014-12-29 | Work condition indicator |
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| Publication Number | Publication Date |
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| CN104535821A CN104535821A (en) | 2015-04-22 |
| CN104535821B true CN104535821B (en) | 2017-11-24 |
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| CN201410829243.6A Active CN104535821B (en) | 2014-12-29 | 2014-12-29 | Work condition indicator |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200986578Y (en) * | 2006-12-29 | 2007-12-05 | 摩比天线技术（深圳）有限公司 | Low noise amplifier monitor alarming device |
| CN202631624U (en) * | 2012-06-29 | 2012-12-26 | 珠海派诺科技股份有限公司 | Current detection device for Hall current transformer |
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