CN108761162A - A kind of oscilloprobe control system and method - Google Patents
A kind of oscilloprobe control system and method Download PDFInfo
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- CN108761162A CN108761162A CN201810418619.2A CN201810418619A CN108761162A CN 108761162 A CN108761162 A CN 108761162A CN 201810418619 A CN201810418619 A CN 201810418619A CN 108761162 A CN108761162 A CN 108761162A
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- oscilloprobe
- transistor
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- relay
- module
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
- G01R13/0218—Circuits therefor
- G01R13/0272—Circuits therefor for sampling
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a kind of oscilloprobe control systems, which is characterized in that including oscilloprobe, relay control module and repid discharge module：(Signal) sample and the measured signal (Signal) is sent to relay control module the oscilloprobe to measured signal；The relay control module is electrically connected with the repid discharge module and system of Oscillograph respectively；The repid discharge module includes signal detection comparing unit and capacitance discharge cell, and the signal detection comparing unit is for detecting whether the measured signal capacitance voltage is more than reference voltage, if so, the capacitance discharge cell is driven to discharge.The present invention not only can normally measure power supply signal, but also can be discharged with accelerating power source capacitance in the case that power supply residual voltage is higher, protect Devices to test and test instrumentation, increase the safety of test operation, while also improving testing efficiency.
Description
Technical field
The present invention relates to oscillograph field more particularly to a kind of oscilloprobe control systems and method
Background technology
Oscilloprobe is most important to the accuracy and correctness of measurement result, it is connection circuit-under-test and oscillography
The electronic unit of device input terminal.Simplest probe is a conducting wire for connecting circuit-under-test and electron oscillograph input terminal, multiple
Miscellaneous probe is made of Resistor-Capacitor Unit and active device.Simple probe does not take shielding measure to be highly susceptible to external electromagnetic
The interference of field, and equivalent capacity itself is larger, causes the load of circuit-under-test to increase, measured signal is made to be distorted.
Currently, in hardware electric signal measurement process, especially in voltage signal test process, due to depositing for capacitance
So that remain residual voltage under power module after electricity whithin a period of time, if residual voltage value is higher, and either with or without timely
It is released, then to the person and equipment all there is security risk, for example Danger Electric shock risk or potential damage test equipment.It is existing
Having in technology, the most method for solving power supply residual voltage is manufactured almost exclusively by be accelerated to discharge to complete to power capacitor, but
Be this method it is most of be all to discharge capacitance to complete departing from real-time test system.It is complicated at one
In test system, independent process single board capacitance electric discharge it is also relatively difficult because have between test instrumentation and veneer to be measured cable or
The connection of signal wire, if dealing with improperly, it is possible to cause test equipment table potential damage occur during accelerating potential is released.
Such as the patent of Publication No. CN105652048A discloses a kind of oscilloprobe, including at least one is used to acquire
Probe, USB interface, analog to digital conversion circuit and the data receipt unit of analog electrical signal.The USB interface is used for and a portable electric
Sub-device connects.At least a probe is electrically connected the analog to digital conversion circuit with this, is used for the analog telecommunications of an at least probe collection
Number be converted to digital signal.The data receipt unit is electrically connected between the analog to digital conversion circuit and the USB interface, for connecing
It receives the digital signal of analog to digital conversion circuit output and stores the digital signal, with the portable electronic connected for the USB interface
Device is obtained and is shown according to the digital signal.The present invention also provides a kind of portable electronic devices and portable type measuring to set
It is standby.Using oscilloprobe, portable electronic device and the portable measurement apparatus of the present invention, it can be achieved that oscillograph function, and
It is easy to carry.The invention does not have repid discharge structure, it usually needs is detached from real-time test system and discharges.
Invention content
The purpose of the present invention is in view of the drawbacks of the prior art, providing a kind of oscilloprobe control system and method, no
It only can normally measure power supply signal, and can discharge with accelerating power source capacitance in the case that power supply residual voltage is higher, protect
Devices to test and test instrumentation, increase the safety of test operation, while also improving testing efficiency.
In order to achieve the goal above, the present invention uses following technical scheme：
A kind of oscilloprobe control system, including oscilloprobe, relay control module and repid discharge module：
(Signal) carries out sampling and sends the measured signal (Signal) oscilloprobe to measured signal
To relay control module；
The relay control module is electrically connected with the repid discharge module and system of Oscillograph respectively；
The repid discharge module includes signal detection comparing unit and capacitance discharge cell, and the signal detection is more single
Member for detect the measured signal capacitance voltage whether be more than reference voltage, if so, drive the capacitance discharge cell into
Row electric discharge.
Preferably, the detecting signal unit includes amplifier (U1), zener diode (D1)：
Amplifier (U1) normal phase input end includes divider resistance (R2) and divider resistance (R3), the amplifier (U1)
Inverting input includes zener diode (D1) and regulating resistor (R1), when amplifier (U1) in-phase input end (+) input voltage
High level H is exported when more than inverting input (-) input voltage, otherwise, output low level L.
Preferably, the capacitance discharge module includes transistor (Q1) and transistor (Q2), the transistor (Q1) and institute
Series resistance (R4) between amplifier (U1) output end is stated, the transistor (Q2) is parallel with resistance (R5) and is gone here and there with resistance (R6)
Connection, when the amplifier (U1) exports high level H, the transistor (Q1) and transistor (Q2) conducting form discharge channel.
Preferably, the resistance (R4) be in parallel with capacitance (C1), the resistance (R6) composition in parallel with capacitance (C3) accelerates
Circuit.
Preferably, the capacitance discharge cell further includes light emitting diode (D2), when the transistor (Q1) and the crystalline substance
The light emitting diode is lighted when body pipe (Q2) conducting.
Preferably, the relay control module includes relay (J1) and transistor circuit, relay (J1) packet
Include first switch contact (1,2) and second switch contact (3,4), the first switch contact (1,2) is by the measured signal
(Signal) it is connected to system of Oscillograph, the second switch contact (3,4) is by the letter to be measured when the relay disconnects
Number (Signal) is connected to repid discharge module；The transistor circuit includes transistor (Q3) and control switch (K1), works as control
System switch (K1) pulls on transistor (Q3) conducting when power supply (VCC).
Preferably, the control switch (K1) is single-pole double-throw switch (SPDT), and the coil for controlling relay powers on or dead electricity,
The conducting transistor (Q3) when control switch (K1) is pulled to power supply (VCC), the relay are closed；When the control is opened
Transistor (Q3) when (K1) is pulled down to ground terminal (GND) is closed to end.
Preferably, the transistor (Q3) uses NPN type triode, and both ends are respectively connected to resistance (R7) and (R9) is used as and divides
Piezoresistance.
Preferably, the relay module further include further include fly-wheel diode (D3), carried after the relay electric-loss
For current drain channel.
Correspondingly, also providing a kind of oscilloprobe control method, including step：
S1, measured signal sampling：Oscilloprobe carry out to measured signal sampling and by the measured signal be connected to after
Electrical control module；
S2, relay module control：Measured signal is connected to system of Oscillograph or repid discharge module by relay module；
S3, repid discharge module discharge：Repid discharge module detects whether the measured signal capacitance voltage is more than benchmark
Voltage, if so, the capacitance discharge cell is driven to discharge.
Compared with prior art, the present invention is sampled and is measured to measured signal by oscilloprobe, relay mould
Block is used to control the connection and switching of signal, and repid discharge module provides a kind of repid discharge approach, residual for realizing capacitance
Pressure is released and is eliminated.Entire Technical Design is simple, easy to operate, and test operation is not only increased in practical operation
Safety, while also improving testing efficiency.
Description of the drawings
Fig. 1 is a kind of oscilloprobe control system architecture schematic diagram that embodiment one provides；
Fig. 2 is a kind of oscilloprobe circuit diagram for oscilloprobe control system that embodiment one provides；
Fig. 3 is a kind of relay control module circuit diagram for oscilloprobe control system that embodiment one provides；
Fig. 4 is a kind of repid discharge module circuit diagram for oscilloprobe control system that embodiment one provides；
Fig. 5 is a kind of oscilloprobe control method flow chart that embodiment two provides.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Embodiment one
The present embodiment provides a kind of oscilloprobe control systems, as shown in Figure 1, including oscilloprobe, relay control
Molding block and repid discharge module：
(Signal) carries out sampling and sends the measured signal (Signal) oscilloprobe to measured signal
To relay control module；
The relay control module is electrically connected with the repid discharge module and system of Oscillograph respectively；
The repid discharge module includes signal detection comparing unit and capacitance discharge cell, and the signal detection is more single
Member for detect the measured signal capacitance voltage whether be more than reference voltage, if so, drive the capacitance discharge cell into
Row electric discharge.
In the prior art, the most method for solving power supply residual voltage, which is manufactured almost exclusively by, accelerates electric discharge power capacitor
It completes, but it is all to discharge capacitance to complete departing from real-time test system that this method is most of.One
In the test system of a complexity, the electric discharge of independent process single board capacitance is also relatively difficult, because having between test instrumentation and veneer to be measured
The connection of cable or signal wire, if dealing with improperly, it is possible to test equipment table be caused to occur during accelerating potential is released
Potential damage.
Technical solution provided in this embodiment includes mainly three probe, relay control, repid discharge modules, oscillograph
Probe is sampled and is measured to measured signal, and relay module is used to control the connection and switching of signal, repid discharge module
A kind of repid discharge approach is provided, releasing and eliminating for realizing capacitor residual voltage：
(1) oscilloprobe
Here oscilloprobe is primarily adapted for use in the measurement of passive system normal power supplies voltage (direct current 48V or less), hands over
Flow supply voltage for example AC220V etc. not design scheme of the present invention consideration within.From measuring principle, equivalent circuit of popping one's head in
As shown in Fig. 2, the signal of Signal acute pyogenic infection of finger tip oscilloprobe probe in detecting, Rprobe, Cprobe, Lprobe respectively represent probe
Equivalent resistance, capacitance, the inductance of circuit.
(2) relay controls
Relay control module is mainly made of relay, control switch, transistor circuit.
Preferably, the relay control module includes relay (J1) and transistor circuit, relay (J1) packet
Include first switch contact (1,2) and second switch contact (3,4), the first switch contact (1,2) is by the measured signal
(Signal) it is connected to system of Oscillograph, the second switch contact (3,4) is by the letter to be measured when the relay disconnects
Number (Signal) is connected to repid discharge module；The transistor circuit includes transistor (Q3) and control switch (K1), works as control
System switch (K1) pulls on transistor (Q3) conducting when power supply (VCC).
Preferably, the control switch (K1) is single-pole double-throw switch (SPDT), and the coil for controlling relay powers on or dead electricity,
The conducting transistor (Q3) when control switch (K1) is pulled to power supply (VCC), the relay are closed；When the control is opened
Transistor (Q3) when (K1) is pulled down to ground terminal (GND) is closed to end.
Preferably, the transistor (Q3) uses NPN type triode, and both ends are respectively connected to resistance (R7) and (R9) is used as and divides
Piezoresistance.
Preferably, the relay module further include further include fly-wheel diode (D3), carried after the relay electric-loss
For current drain channel.
As shown in figure 3, relay J1：Contain two groups of switch contacts.Normal condition is closed state, switch contact 1,2
Signal, GND signal are connected to system of Oscillograph, when relay status is to disconnect, switch contact 3,4 is by Signal, GND
Signal is connected to repid discharge module.
Relay module further comprises a sustained diode 3, and the logical of current drain will be provided after relay electric-loss
Road.
Control switch K1：It is designed as single-pole double-throw switch (SPDT), the coil for controlling relay powers on or dead electricity, so that
Between relay contact switch 1,3 and 2, switch between 4.Control switch acquiescence is pulled to VCC.
Transistor Q3：Play the role of electronic switch in technical solution of the present invention.NPN type triode is used in invention,
R7 and R9 provides enough bias voltages for transistor turns as divider resistance.When control switch K1 terminals 1 are pulled to
When VCC, transistor Q3 conductings, when control switch K1 terminals 2 are pulled down to GND, transistor Q3 cut-offs.
(3) repid discharge module
Repid discharge module includes mainly signal detection comparing unit and capacitance discharge cell, it is preferred that the signal inspection
It includes amplifier (U1), zener diode (D1) to survey unit：
Amplifier (U1) normal phase input end includes divider resistance (R2) and divider resistance (R3), the amplifier (U1)
Inverting input includes zener diode (D1) and regulating resistor (R1), when amplifier (U1) in-phase input end (+) input voltage
High level H is exported when more than inverting input (-) input voltage, otherwise, output low level L.
Preferably, the capacitance discharge module includes transistor (Q1) and transistor (Q2), the transistor (Q1) and institute
Series resistance (R4) between amplifier (U1) output end is stated, the transistor (Q2) is parallel with resistance (R5) and is gone here and there with resistance (R6)
Connection, when the amplifier (U1) exports high level H, the transistor (Q1) and transistor (Q2) conducting form discharge channel.
Preferably, the resistance (R4) be in parallel with capacitance (C1), the resistance (R6) composition in parallel with capacitance (C3) accelerates
Circuit.
Preferably, the capacitance discharge cell further includes light emitting diode (D2), when the transistor (Q1) and the crystalline substance
The light emitting diode is lighted when body pipe (Q2) conducting.
Circuit diagram as shown in Figure 4：
C4 is the electrolytic capacitor on Devices to test, and C4 has still been remained higher since energy storage acts on after power supply quickly descends electricity
Voltage, the function of repid discharge module is exactly for the charge being stored in C4 of quickly releasing.
Signal detection comparing unit：In the present embodiment technical solution, signal detection comparing unit is mainly by amplifier U1 groups
At, it is aided with the reference voltage signal (zener diode D1) of periphery, signal sample circuit (R2 form with R3 bleeder circuits),
When in-phase input end (+) input voltage of amplifier is more than inverting input (-) voltage, amplifier exports high level H, no
Then, low level L will be exported.The transistor Q1 switching circuits of rear class only can be just driven when output voltage is high level H.
Capacitance discharge cell：It is mainly made of cascade NPN transistor Q1, Q2, R4 and C1, R6 and C3 constitute acceleration electricity
Road makes transistor fast conducting.After Q1 is connected, R5 terminal voltages are raised, and then Q2 obtains enough bias voltages and is connected,
In this way, the opinion of VDD and GND forms an access of quickly releasing, the charge for being stored in capacitance C4 is made quickly to release, to reach drop
The purpose of low power supply residual voltage.When the residual voltage on capacitance is less than the diode D1 voltages of amplifier in, amplifier U1 outputs
Low level L, rear class transistor circuit will end, and voltage access of releasing will be switched off.During at capacitance both ends, residual voltage constantly declines,
Light emitting diode D2 will be lighted always, indicate voltage reduction, charge discharging resisting process.
Oscilloprobe job control flow is as follows：
(1) power supply signal measures：It controls switch K1 and connects VCC==》Transistor Q3 conductings==》Relay switch contacts
Normally off (acquiescence)==》Probe signal is connected directly to oscilloscope measurement channel；
(2) power supply signal, which measures, terminates or switches other tests：Electric under Devices to test==》It controls switch K1 and connects GND
==》Transistor Q3 cut-offs==》Relay switch contacts off-state==》Probe signal is connected directly to repid discharge dress
Set==》Capacitor residual voltage detection==》Capacitance fast discharge process；
(3) capacitance fast discharge process：If detection capacitance voltage is more than reference voltage, rear class transistor turns,
Charge discharging resisting process is persistently carried out, until detection capacitance voltage less than until reference voltage；If it is low to detect capacitor residual voltage
In reference voltage, rear class transistor cutoff, capacitance is released access disconnection, and electric discharge terminates.
Compared with prior art, the present embodiment is sampled and is measured to measured signal by oscilloprobe, relay
Module is used to control the connection and switching of signal, and repid discharge module provides a kind of repid discharge approach, for realizing capacitance
Residual voltage releasing and eliminating.Entire Technical Design is simple, easy to operate, and test operation is not only increased in practical operation
Safety, while also improving testing efficiency.
Embodiment two
The present embodiment provides a kind of oscilloprobe control methods, as shown in figure 5, including step：
S11, measured signal sampling：Oscilloprobe carry out to measured signal sampling and by the measured signal be connected to after
Electrical control module；
S12, relay module control：Measured signal is connected to system of Oscillograph or repid discharge mould by relay module
Block；
S13, repid discharge module discharge：Repid discharge module detects whether the measured signal capacitance voltage is more than benchmark
Voltage, if so, the capacitance discharge cell is driven to discharge.
Oscilloprobe acquires measured signal and measured signal is connected to relay control module；Relay control module
It is controlled respectively including two groups of switch contacts and measured signal is connected to system of Oscillograph and discharge module, sent out when switch contact triggers
When electric module, repid discharge module is detected and discharges to residual capacity voltage.
Compared with prior art, oscilloprobe control method provided in this embodiment may be implemented real-time testing and quickly
Electric discharge, fast implements releasing and eliminating for capacitor residual voltage, easy to operate, and the peace of test operation is not only increased in practical operation
Quan Xing, while also improving testing efficiency.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of oscilloprobe control system, which is characterized in that put including oscilloprobe, relay control module and quickly
Electric module：
The oscilloprobe to measured signal (Signal) carry out sampling and by the measured signal (Signal) be sent to after
Electrical control module；
The relay control module is electrically connected with the repid discharge module and system of Oscillograph respectively；
The repid discharge module includes signal detection comparing unit and capacitance discharge cell, and the signal detection comparing unit is used
In detecting whether the measured signal capacitance voltage is more than reference voltage, if so, the capacitance discharge cell is driven to be put
Electricity.
2. a kind of oscilloprobe control system as described in claim 1, which is characterized in that the detecting signal unit includes
Amplifier (U1), zener diode (D1)：
Amplifier (U1) normal phase input end includes divider resistance (R2) and divider resistance (R3), amplifier (U1) reverse phase
Input terminal includes zener diode (D1) and regulating resistor (R1), when amplifier (U1) in-phase input end (+) input voltage is more than
High level H is exported when inverting input (-) input voltage, otherwise, output low level L.
3. a kind of oscilloprobe control system as described in claim 1, which is characterized in that the capacitance discharge module includes
Transistor (Q1) and transistor (Q2), series resistance (R4) between the transistor (Q1) and the amplifier (U1) output end,
The transistor (Q2) is parallel with resistance (R5) and connects with resistance (R6), when the amplifier (U1) exports high level H, institute
It states transistor (Q1) and transistor (Q2) conducting forms discharge channel.
4. a kind of oscilloprobe control system as claimed in claim 3, which is characterized in that the resistance (R4) and capacitance
(C1) resistance (R6) composition accelerating circuit in parallel with capacitance (C3) in parallel, described.
5. a kind of oscilloprobe control system as described in claim 1, which is characterized in that the capacitance discharge cell also wraps
Light emitting diode (D2) is included, the light emitting diode is lighted when the transistor (Q1) and the transistor (Q2) conducting.
6. a kind of oscilloprobe control system as described in claim 1, which is characterized in that the relay control module packet
Include relay (J1) and transistor circuit, the relay (J1) include first switch contact (1,2) and second switch contact (3,
4), the measured signal (Signal) is connected to system of Oscillograph by the first switch contact (1,2), when the relay is disconnected
The measured signal (Signal) is connected to repid discharge module by the second switch contact (3,4) when opening；The transistor
Circuit includes transistor (Q3) and control switch (K1), the transistor (Q3) when control switch (K1) pulls on power supply (VCC)
Conducting.
7. a kind of oscilloprobe control system as claimed in claim 6, which is characterized in that the control switch (K1) is single
Double-pole double throw switch, the coil for controlling relay powers on or dead electricity, when control switch (K1) is pulled to power supply (VCC)
Transistor (Q3) is connected, the relay is closed；The transistor (Q3) when control switch (K1) is pulled down to ground terminal (GND)
Cut-off.
8. a kind of oscilloprobe control system as claimed in claim 6, which is characterized in that the transistor (Q3) uses
NPN type triode, both ends are respectively connected to resistance (R7) and (R9) is used as divider resistance.
9. a kind of oscilloprobe control system as described in claim 1, which is characterized in that the relay module further includes
Further include fly-wheel diode (D3), current drain channel is provided after the relay electric-loss.
10. a kind of oscilloprobe control method, which is characterized in that including step：
S1, measured signal sampling：Oscilloprobe carries out sampling to measured signal and the measured signal is connected to relay
Control module；
S2, relay module control：Measured signal is connected to system of Oscillograph or repid discharge module by relay module；
S3, repid discharge module discharge：Repid discharge module detects whether the measured signal capacitance voltage is more than reference voltage,
If so, the capacitance discharge cell is driven to discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810418619.2A CN108761162A (en) | 2018-05-04 | 2018-05-04 | A kind of oscilloprobe control system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810418619.2A CN108761162A (en) | 2018-05-04 | 2018-05-04 | A kind of oscilloprobe control system and method |
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| Publication Number | Publication Date |
|---|---|
| CN108761162A true CN108761162A (en) | 2018-11-06 |
Family
ID=64009870
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|---|---|---|---|
| CN201810418619.2A Pending CN108761162A (en) | 2018-05-04 | 2018-05-04 | A kind of oscilloprobe control system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501046A (en) * | 2019-09-16 | 2019-11-26 | 王元西 | Plane coiled wire-wound coil acquires displacement and angular-rate sensor without magnetic |
| CN112462215A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Full-size cable insulation charge quantity test platform and method |
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| CN207304142U (en) * | 2017-09-04 | 2018-05-01 | 华晶精密制造股份有限公司 | A kind of multichannel PLC low pressure uninterruption power sources |
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| US5457425A (en) * | 1993-09-16 | 1995-10-10 | Hitachi Denshi Kabushiki Kaisha | Input circuit used in apparatus for measuring electric signal |
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| CN110501046A (en) * | 2019-09-16 | 2019-11-26 | 王元西 | Plane coiled wire-wound coil acquires displacement and angular-rate sensor without magnetic |
| CN112462215A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Full-size cable insulation charge quantity test platform and method |
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Effective date of registration: 20190417 Address after: 201616 No. 3666 Sixian Road, Songjiang District, Shanghai Applicant after: Shanghai Feixun Data Communication Technology Co., Ltd. Address before: 610100 125 Longquan Street Park Road, Longquanyi District, Chengdu, Sichuan. Applicant before: Sichuan fixun Information Technology Co., Ltd. |
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Application publication date: 20181106 |