CN109959813A - The multimeter and its host and control method of changeable test pencil - Google Patents
The multimeter and its host and control method of changeable test pencil Download PDFInfo
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- CN109959813A CN109959813A CN201910350694.4A CN201910350694A CN109959813A CN 109959813 A CN109959813 A CN 109959813A CN 201910350694 A CN201910350694 A CN 201910350694A CN 109959813 A CN109959813 A CN 109959813A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
- G01R15/125—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will for digital multimeters
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- A Measuring Device Byusing Mechanical Method (AREA)
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Abstract
The invention discloses a kind of multimeter of changeable test pencil and its host and control methods.The multimeter includes test pencil and multimeter host, and the test pencil with the multimeter host for connecting；The multimeter host is equipped with two groups of socket, test pencil moving mass, guide part and first detection units for being inserted into for test pencil；The test pencil moving mass can be moved along the guide part；The test pencil moving mass is equipped with two groups of movement contacts, and multiple groups fixed contact is equipped on the direction of guide part guiding；Movement contact described in two groups is connect with socket described in two groups respectively；Movement contact described in two groups can be contacted with fixed contact described in different two groups respectively；The first detection unit is used to that the movement contact to be made to be connected with the corresponding measuring circuit when the test pencil moving mass reaches designated position.The control method uses the multimeter host.Operation of the present invention is simple, can reduce the number of plug test pencil, is easy to use.
Description
Technical field
The present invention relates to field of measuring technique, in particular to the multimeter and its host and controlling party of a kind of changeable test pencil
Method.
Background technique
Multimeter is also known as multi-meter, multimeter, avometer, numerous table etc., is that the departments such as power electronics are indispensable
Measuring instrumentss, generally to measure voltage, electric current and resistance as the main purpose.Multimeter by display mode be divided into pointer multimeter and
Digital multimeter is a kind of multi-functional, multiple range measuring instrumentss.General multimeter can measure DC current, DC voltage, friendship
Galvanic electricity stream, alternating voltage, resistance and audio-frequency electric equality, some can also to measure alternating current, capacitance, inductance and semiconductor
Some parameters.
The measurement of capacitor, inductance, resistance, combined-voltage does not have to switching test pencil, by simulation inside multimeter or after
Electric switch, which switches over, can achieve the purpose that measurement.Due to the internal resistance very little of multimeter current measurement gear, to prevent
User occurs mistake when in use and such as burns out multimeter with current measurement gear measurement voltage, so by current measurement
The test pencil socket of gear and voltage measurement gear separates, and changes the socket of test pencil when using current measurement gear.To increase
Strong electric conductivity, test pencil is close compared with outlet contacts, therefore must use two hands that could complete to replace when plug
The operation of test pencil, cause it is troublesome in poeration, such as: in the bad measurement environment of lighting condition, be not easy test pencil being directed at socket.
Summary of the invention
For make up the above-mentioned prior art at least one of it is insufficient, the present invention propose a kind of changeable test pencil multimeter and its
Host and control method.
In order to solve the above technical problems, the invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of multimeter host of changeable test pencil, the multimeter host is equipped with two
Socket of the group for being inserted into for test pencil；It further include test pencil moving mass, guide part and first detection unit；The test pencil moving mass can
It is moved along the guide part；
The test pencil moving mass is equipped with two groups of movement contacts, fixes on the direction of guide part guiding equipped with multiple groups
Contact, wherein fixed contact described in every two groups is connected from different measuring circuits；
Movement contact described in two groups is connect with socket described in two groups respectively；Described in two groups movement contact can respectively from it is different
The contact of fixed contact described in two groups, to be connected from different measuring circuits；
The first detection unit be used for the test pencil moving mass reach designated position when make the movement contact with it is right
The measuring circuit conducting answered.
In some preferred embodiments, the first detection unit is also used to: detecting that the key that is triggered is corresponding
Function corresponding with designated position locating for the test pencil moving mass function difference when, alert and/or disconnect institute
State the access where movement contact.
In some preferred embodiments, the fixed contact is resilient conductive member, and the resilient conductive member is
Elastic conducting strip.
In some preferred embodiments, the first detection unit includes multimeter mainboard and position detecting circuit,
The multimeter mainboard is connect with the position detecting circuit.
In some preferred embodiments, the position detecting circuit is infrared circuit, is led in the guide part
To direction on be additionally provided with multiple detection holes, it is described to detect that the infrared circuit can emit signal by the detection hole
Whether test pencil moving mass is located at the designated position.
In some preferred embodiments, the test pencil moving mass is test pencil sliding block, and the guide part is slideway.
In some preferred embodiments, socket described in every group includes patch jack and contact interface, and the wiring is inserted
Hole is connect with the movement contact.
In second aspect, the present invention provides a kind of control method of the multimeter host of changeable test pencil, the multimeter
Host is equipped with two groups of sockets for being inserted into for test pencil；It further include test pencil moving mass, the test pencil moving mass is equipped with two groups of fortune
Movable contact, movement contact described in two groups are connect with socket described in two groups respectively；
The control method includes:
When detecting that the test pencil moving mass is located at designated position, lead the movement contact with corresponding measuring circuit
It is logical.
In some preferred embodiments, further includes: detecting the corresponding function of the key that is triggered and the test pencil
When the corresponding function difference in designated position locating for moving mass, the access where the movement contact is disconnected.
In the third aspect, the present invention provides a kind of multimeter of changeable test pencil, including test pencil and above-mentioned multimeter host,
The test pencil with the multimeter host for connecting.
In fourth aspect, the present invention provides a kind of control method of multimeter, the controlling party including above-mentioned multimeter host
Method；The multimeter includes test pencil and the multimeter host, and the test pencil with the multimeter host for connecting, the table
Pen includes shift indicator and measurement indicator；
The control method of the multimeter further include:
If current measuring gear is specified gear, the shift indicator output is controlled for indicating current measurement
Gear is the first information of specified gear；
Control the measurement indicator output measurement result information.
In some preferred embodiments, pass through identical channel:
The first communication signal is sent to control the shift indicator and export the first information；Send the second communication signal
To control the shift indicator output for indicating that current measuring gear is the second information of the gear except specified gear；
First communication signal and second communication signal include at least one first level signal and/or at least one second
Level signal；The voltage value of first level signal and the second electrical level signal is within the scope of the first voltage value；It is described
First level signal continues first time length, and the second electrical level signal continues the second time span；
It is defeated to control the measurement indicator to send third analog voltage signal of the voltage value within the scope of third voltage value
The measurement result information out；
The first time length is different time spans from second time span；The third voltage value range
It is different range of voltage values from the first voltage value range.
At the 5th aspect, the present invention provides a kind of computer readable storage medium, and being stored with makes in conjunction with calculating equipment
Computer program, the computer program can be executed by processor to realize the above method.
Compared with prior art, the beneficial effects of the present invention are as follows:
When needing the current measurement gear using multimeter, move to it along guide part to test pencil moving mass force
Designated position corresponding with current measurement gear, it is easy to operate, the number of plug test pencil can be reduced, is easy to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the multimeter host of the embodiment of the present invention；
Fig. 2 shows the structures of the test pencil main body of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the test pencil main body of the embodiment of the present invention；
Fig. 4 shows the structure of the test pencil plug of the embodiment of the present invention；
Fig. 5 is first information exchange figure of the embodiment of the present invention；
Fig. 6 is second information exchange figure of the embodiment of the present invention；
Fig. 7 is the third information exchange figure of the embodiment of the present invention；
Fig. 8 shows the structure of the pedestal of the multimeter host of the embodiment of the present invention；
Fig. 9 is the structural schematic diagram of the first control unit of the embodiment of the present invention；
Figure 10 shows a part of circuit of the current measurement gear of the embodiment of the present invention；
Figure 11 shows a part of control circuit of the multimeter host of the embodiment of the present invention.
Specific embodiment
Referring to figs. 1 to Figure 11, elaborate below to embodiments of the present invention.It is emphasized that following the description
It is only exemplary, the range and its application being not intended to be limiting of the invention.Wherein, term " first ", " second " are only used
In description purpose, it is not understood to indicate or imply relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more this feature.
First embodiment
Referring to figs. 1 to Fig. 4, the multimeter of the changeable test pencil of the present embodiment includes multimeter host 1 and test pencil 2, test pencil 2
It can be connect with multimeter host 1, to send signal to multimeter host 1 or receive signal from multimeter host 1.
With reference to Fig. 1, multimeter host 1 is equipped with two groups of sockets 10 for being inserted into for test pencil 2.The multimeter of the present embodiment has
Two test pencils 2 are respectively for insertion into two groups of sockets 10.Every group of socket 10 includes at least one mouth.
With reference to Fig. 8 and Fig. 9, multimeter host 1 further includes test pencil moving mass 11, guide part 12 and first detection unit 13.
With reference to Fig. 8, test pencil moving mass 11 can be moved along guide part 12.The form of test pencil moving mass 11 include test pencil sliding block and
Test pencil spill spin block.Correspondingly, guide part 12 is used to the slideway of test pencil slider guide or is used to test pencil spill spin block to lead
To circular trough.In the present embodiment, test pencil moving mass 11 is test pencil sliding block, and guide part 12 is slideway.
With reference to Fig. 8, test pencil moving mass 11 is equipped with two groups of movement contacts 111.Specifically, two groups of movement contacts 111 are distinguished
The two sides of test pencil moving mass 11 are set.When test pencil moving mass 11 moves, movement contact 111 follows test pencil moving mass 11 to transport
It is dynamic.Every group of movement contact 111 includes at least one contact.
With reference to Fig. 8, multiple groups fixed contact 121 is equipped on the direction 120 that guide part 12 is oriented to, wherein every two groups fixed touchings
Point 121 is connected from different measuring circuits.That is, every two groups of fixed contacts 121 are connect with a measuring circuit；If there is six groups it is solid
Fixed contact 121, then corresponding there are three different measuring circuits.Every group of fixed contact 121 includes at least one contact.
Specifically, guide part 12 and fixed contact 121 are respectively provided on the pedestal 13 of multimeter host 1 with reference to Fig. 8.
The form of measuring circuit is specifically including but not limited to DC current measuring circuit, DC voltage measuring circuit, exchange
Current measurement circuit, alternating current voltage measuring circuit and resistance measuring circuit.
Specifically, two groups of fixed contacts 121 are located at the two sides of guide part 12.
Two groups of movement contacts 111 are connect with two groups of sockets 10 respectively.In the present embodiment, with reference to Fig. 8, two groups of sockets 10 are set
It sets on test pencil moving mass 11, is specifically separately positioned on the two sides of test pencil moving mass 11.Socket 10 be equipped with conductive component, two groups
Movement contact 111 is connect with the conductive component of two groups of sockets 10 respectively.In other embodiments, the conductive component of two groups of sockets 10
End as two groups of movement contacts 111.
When test pencil moving mass 11 is moved along guide part 12, two groups of movement contacts 111 can be fixed from different two groups respectively is touched
121 contact of point, so that two groups of movement contacts 111 are connected from different measuring circuits.
The corresponding designated position of every two groups of fixed contacts 121.When test pencil moving mass 11 move to along guide part 12 it is specified
When position, two groups of movement contacts 111 are just contacted with corresponding two groups of fixed contacts 121 respectively.
First detection unit 13 is used to make to move contact 111 and corresponding survey when test pencil moving mass 11 reaches designated position
Measure circuit conducting.
In the present embodiment, with reference to Fig. 9, first detection unit 13 includes multimeter mainboard 131, position detecting circuit 132
With first control unit 133.Wherein, multimeter mainboard 131 includes multiple measuring circuits, and first control unit 133 is microcontroller
Unit (MCU, Microcontroller Unit).Multimeter mainboard 131 is connect with position detecting circuit 132, to obtain letter
Number.In the present embodiment, first detection unit 13 detects the position of test pencil moving mass 11 by infrared sensor, correspondingly, position
Setting detection circuit 132 is infrared circuit.Multiple detection holes 122 are additionally provided on the direction 120 that guide part 12 is oriented to.Each
Detection hole 122 corresponds to two groups of fixed contacts 121, namely a corresponding designated position.Detection hole 122 is also disposed at multimeter host
On 1 pedestal 13.Specifically, guide part 12 is two slideways, detection hole 122 is located at the centre of two slideways.
In the present embodiment, with reference to Fig. 8, it is first detection hole, second respectively that the quantity of detection hole 122, which is three,
Detection hole and third detection hole, are distributed from the bottom to top in figure.Two test pencils 2 are located at two groups of sockets 10 of multimeter host 1
In, test pencil moving mass 11 is located at first corresponding position of detection hole 122.At this point, the friendship inside movement contact 111 and multimeter
DC voltage, resistance, diode, buzzing, frequency measurement circuit are connected.When multimeter measuring gear from aforementioned measuring gear more
When changing 3A current measurement gear into, it is corresponding that 11 stress of test pencil moving mass along guide part 12 moves to second detection hole 122
Position.The fixed contact 121 that two groups of movement contacts 111 correspond to 3A current measurement circuit with two groups respectively contacts.At this point, test pencil
Moving mass 11 shelters from detection hole 122.Infrared circuit is blocked by the infrared signal that detection hole 122 emits, infrared inspection
Slowdown monitoring circuit generates an instruction test pencil moving mass 1 and is located at the signal of designated position and is sent to multimeter mainboard 131.Multimeter master
Movement contact 111 is connected with 3A current measurement circuit in plate 131, specifically can be multimeter mainboard 131 and gives 3A current measurement electricity
Road powers or is closed the control switch inside 3A current measurement circuit.Exemplary, with reference to Figure 10, control switch is that simulation is opened
It closes, fixed contact 121 is the contact 3A 121A, and the micro-control unit controls analog switch of multimeter mainboard 131 samples electricity using 3A
The sampled value of resistance 123.In this way, 3A current measurement gear can be used to measure electric current.
It is also in this way, 11 stress of test pencil moving mass is moved along guide part 12 when for being replaced with 10A current measurement gear
It moves contact 111 with reference to Figure 10 to the corresponding position of third detection hole 122 and is contacted with the contact 10A 121B, multimeter mainboard
131 micro-control unit controls analog switch, uses the sampled value of 10A sampling resistor 124.In this way, 10A electric current can be used to survey
It measures gear and measures electric current.
As described above, making it to the force of test pencil moving mass 11 when needing the current measurement gear using multimeter
Designated position corresponding with current measurement gear is moved to along guide part 12, it is easy to operate, plug test pencil can be reduced
Number is easy to use.
Multimeter only retains two groups of sockets 10, and socket 10 is fixed on test pencil moving mass 11, can pass through sliding test pencil fortune
Motion block 11 drives the test pencil 2 of multimeter to switch to current measurement gear, and a hand can operate, and switches simple and quick.
Fixed contact 121 is resilient conductive member.Specifically, resilient conductive member is elastic conducting strip.Test pencil moving mass
When 11 movement contact 111 and fixed contact 121 contact, fixed contact 121 generates deformation.The movement contact of test pencil moving mass 11
After 111 leave fixed contact 121, fixed contact 121 restores to the original state under the action of natural resiliency.So, it is ensured that movement touching
Point 111 and 121 reliable contacts of fixed contact.
With reference to Fig. 8, every group of socket 10 includes patch jack 101 and contact interface 102.Patch jack 101 and movement contact
111 connections.Patch jack 101 is used to receive measuring signal from test pencil 2.Contact interface 102 is used to send signal to test pencil 2,
Equipped with conductive contact.Socket 10 can provide the signal of electric energy and needs to test pencil 2, it is seen then that the function of socket 10 is compound.
Specifically, contact interface 102 includes power supply interface and analog/digital signal output interface；In this way, multimeter host 1 can be table
Pen 2 is powered, or can send analog signal and/or digital signal to test pencil 2.The multimeter host 1 of the present embodiment can with it is logical
Test pencil is used cooperatively, and the multi-functional test pencil that can also be powered with needs and need to provide analog/digital signal is used cooperatively.
Certainly, every group of socket 10 can also include the interface for exporting other communication signals.
Test pencil moving mass 11 can be it is electronic, switch gear key be triggered after, test pencil moving mass 11 moves to finger
Positioning is set.
First detection unit 13 can also detect test pencil moving mass by touch switch or close to switches such as switches
11 position.Wherein, it can be Hall switch close to switch.
Second embodiment
First detection unit 13 is also used to: being detected locating for the corresponding function of the key that is triggered and test pencil moving mass 11
When the corresponding function difference in designated position, the access where movement contact 11 is disconnected.Wherein, key can be mechanical key,
It can be virtual key.
After first detection unit 13 detects that test pencil moving mass 11 moves to designated position, it is corresponding to record the designated position
Function is measured, and makes to move contact 11 and the conducting of corresponding measuring circuit.In the present embodiment, measurement function is measurement electric current.
In measurement, if be triggered with the key of measurement voltage, first detection unit 13 is judged after receiving signal, determines quilt
The corresponding function of triggering key is not measurement electric current, namely the key being triggered is non-current measurement key.At this point, the first detection
Access where unit 13 disconnects movement contact 11 prevents multimeter from damaging to protect to multimeter.
Certainly, first detection unit 13 can be sent out alarm signal other than disconnecting the access where movement contact 11
It ceases wrong with the operation for reminding user current.Warning message can be sound, light or vibration.
Specifically, it is ' 1 ', ' 2 ' and ' 3 ' respectively that there are three pins for the tool of relay 134 with reference to Figure 11.Under normal condition,
The signal in relay control signal channel 100 is that low level signal namely first control unit 133 are sent to relay 134
Signal is low level signal.Foot ' 1 ' and foot ' 3 ' are connected at this time, so that movement contact 11 is corresponding on multimeter mainboard 131
Measuring circuit conducting.When test pencil moving mass 11 is when second detection hole or third detection hole, if non-electric current
Measurement key is triggered, and multimeter starts to alarm, while the signal in relay control signal channel 100 becomes high level signal,
The foot ' 1 ' and foot ' 3 ' of relay 134 disconnect, so that moving contact 11 and the corresponding measuring circuit on multimeter mainboard 131
It disconnects, the access of test pencil 2 is cut off.
3rd embodiment
Referring to figs. 2 to Fig. 4, test pencil 2 includes test pencil main body 20, test pencil plug 24 and conducting wire 25.With reference to Fig. 3, test pencil main body
20 include shift indicator 21, measurement indicator 22 and the second control unit 23.
Test pencil plug 24 is connect with conducting wire 25.Test pencil 2 is connect by test pencil plug 24 with multimeter host 1.Specifically, ten thousand
With there is socket 10 on table host 1, test pencil plug 24 is inserted in the socket 10 of multimeter host 1.
Conducting wire 25 is used for transmission signal；Specifically, conducting wire 25 is multicore cable.Test pencil 2 passes through conducting wire 25 to multimeter master
Machine 1 sends signal or receives signal from multimeter host 1.Specifically, external signal is transferred to by conducting wire 25 in measurement
Multimeter host 1；Second control unit 23 then receives the signal that multimeter host 1 is sent by conducting wire 25.
With reference to Fig. 2, the current measuring gear that shift indicator 21 is used to indicate multimeter is specified gear；Specifically,
When multimeter works, the current measuring gear of instruction multimeter is current measurement gear, voltage measurement gear or resistance measurement shelves
Position etc.；Namely specified gear can be current measurement gear, voltage measurement gear or resistance measurement gear, set with specific reference to needs
It is fixed.
With reference to Fig. 2, the measurement result information that indicator 22 is used to indicate multimeter is measured；Specifically, working in multimeter
When, indicate the voltage currently measured, electric current perhaps resistance etc. or instruction and the voltage, electric current or resistance phase that currently measure
The information of pass.Measurement result information can also be that the information of measured value no to scale, such as measurement voltage exceed current range.
Second control unit 23 can be micro-control unit (MCU, Microcontroller Unit).
The control method of the present embodiment is illustrated, the control of the test pencil of control method and multimeter including multimeter
Method.
For multimeter, voltage is measured in current measurement gear, it is easy to multimeter be caused to damage.Make to remind
User, in the present embodiment, specified gear are current measurement gears.
If current measuring gear is current measurement gear, the output of shift indicator 21 is controlled for indicating current survey
Amount gear is the first information of current measurement gear.Specifically, multimeter host 1 is sent to the second control unit 23 indicates current
Measuring gear be current measurement gear signal, after the second control unit 23 receives signal, control shift indicator 21 it is defeated
The first information out.Wherein, the first information is the light of yellow namely the light of the sending yellow of shift indicator 21；In some realities
It applies in example, the first information is vibration or voice；In this way, user can be reminded to notice that current measuring gear is current measurement
Gear.In this case, shift indicator 21 is luminescent device.Certainly, current measurement gear corresponds to the light of yellow,
Its gear can correspond to the light of white or the light of other colors.
During measurement, multimeter host 1 is according to the externally measured signal received, by its voltage value by setting ratio
Example is converted, and guarantees that range of voltage values meets the range of voltage values of setting, indicates that measured value is how many letter after being converted
Number；Specifically, the external signal relatively high to voltage of multimeter host 1 carries out partial pressure or the signal low to voltage amplifies,
So that the analog signal of measurement is in the range of voltage values of setting always, be specially in always more than or equal to 0V and be less than or equal to
In the range of 2.5V.Signal after conversion is sent to control unit 23 by multimeter host 1.After control unit 23 reads conversion
Signal is simultaneously handled, and after the second control unit 23 receives signal, control measurement indicator 22 exports measurement result information.Specifically
, measurement result information is measured value or information relevant to measured value.Information relevant to measured value can be range
Percentage can be the percentage of voltage range or the percentage of current range.Measurement result information can be the shape of light
Formula, specifically, measured value or the corresponding position of information relevant to measured value shine.
For measuring voltage.During measuring voltage, the voltage that outside provides is 10V, 1 basis of multimeter host
The automatic handover measurement channel (range 20V) of the voltage signal received carries out 1/10 partial pressure, and measuring signal at this time becomes
For 1V, and this signal is output to signalling contact 242.After second control unit 23 receives signal, control measurement indicator 22
Export measurement result information.It measures position corresponding with (1/2) * 100% on indicator 22 to shine, it is assumed that have 10 photophores
Part respectively corresponds 0V to 20V.It shines in this way, can be the 5th luminescent device, it is equal to be also possible to the 1st to the 5th luminescent device
It shines；Or position corresponding with 50% shines, it is assumed that has 10 luminescent devices, respectively corresponds 0% to 100%, in this way, can be with
It is that the 5th luminescent device shines, is also possible to the 1st to the 5th luminescent device and shines.Luminescent device can be LED light.
As described above, the shift indicator 21 of test pencil 2 exports table if current measuring gear is current measurement gear
Show that current measuring gear is the first information of current measurement gear, is used to remind user note that can avoid user
Current measurement gear measures voltage.During measurement, the measurement indicator 22 of test pencil 2 exports measurement result information, in this way,
User directly can see measurement result on test pencil 2.As it can be seen that the present embodiment can be easy to use, user experience can be improved.
Fourth embodiment
What shift indicator 21 indicated is state, is realized by the digital signal received.And measure the finger of indicator 22
What is shown is numerical value, is realized by the analog signal received.Common practice is to transmit digital signal with a channel, is used
Transmission of analogue signal is carried out in another channel.Using two passes, does not require nothing more than and generate digital signal there are two corresponding circuit
And analog signal, it is also necessary to which two lines are as channel, this meeting is so that the structure of multimeter becomes complexity, increase cost.
In the control method of fourth embodiment, digital signal and analog signal, Ye Jitong are transmitted by a channel
Identical channel is crossed to transmit digital signal and analog signal.
The current measuring gear of instruction multimeter is illustrated below.
With reference to Fig. 5, multimeter host 1 sends the first communication signal to control unit 23.In the present embodiment, the first communication
Signal includes first level signal and a second electrical level signal, and the first level signal is preceding, and second electrical level signal is rear.
For the ease of identifying that there are two level signals, for the first communication signal, between the first level signal and second electrical level signal
It was divided into for the first interval time；Specifically, the first interval time was greater than 10us and was less than 20ms.It is logical that control unit 23 receives first
After interrogating signal, identify that the first communication signal includes two positions (bit) of two level signals namely corresponding digital signals,
In, first is the first level signal, second second electrical level signal.Wherein, control unit 23 passes through the electricity to level signal
Pressure value range and time duration are judged, to identify that level signal is the first level signal or second electrical level
Signal.If the voltage value of level signal is within the scope of the first voltage value and continues first time length, for the first level signal.
If the voltage value of level signal is within the scope of the first voltage value and continues the second time span, for second electrical level signal.It can root
According to specifically needing to set the first voltage value range, first time length and the second time span, wherein the second time span and the
One time span is different.Exemplary, the first voltage value range is 3V to 5.0V, and first time length is 25ms ± 2ms, the
Two time spans are 15ms ± 2ms.In the present embodiment, 3V to 5.0V is communication level, and the first level signal is high level letter
Number, second electrical level signal is low level signal.According to scheduled agreement, control unit 23 identifies that the first communication signal is one
Two communication signals, for " 0B10 "；" 0B " represents binary system, and " 1 " represents the first level signal namely high level signal, " 0 "
Represent second electrical level signal namely low level signal.It is specified gear, control unit 23 that " 0B10 ", which represents current measuring gear,
It controls shift indicator 21 and exports the first information, so that shift indicator 21 be made to indicate that current measuring gear is specified gear.
With reference to Fig. 6, multimeter host 1 sends the second communication signal to control unit 23.In the present embodiment, the second communication
Signal includes two second electrical level signals, one in front and one in back.It was divided into for the first interval time between two second electrical level signals.Control is single
It after member 23 receives the second communication signal, identifies that the second communication signal includes two level signals, specifically includes two the
Two level signals namely two low level signals.According to scheduled agreement, control unit 23 identifies that the second communication signal is one
A two communication signals, for " 0B00 "；" 0B " represents binary system, and it is second electrical level signal that " 0 ", which represents two level signals,
Namely low level signal.It is the gear except specified gear that " 0B00 ", which represents current measuring gear, and control unit 23 controls shelves
The position output of indicator 21 is for indicating that current measuring gear is the second information of the gear except specified gear.Specified gear it
Outer gear can be resistance grade, voltage gear or other gears.The form of second information can be white light, vibration,
Voice or other forms.The particular content of second information and the first information be it is distinguishing, with the survey for reminding user current
Amount gear is the gear except specified gear or specified gear.
The voltage value of first level signal and second electrical level signal is within the scope of the first voltage value, but the first level signal
It is different with second electrical level signal duration length.First level signal and second electrical level signal duration length can
It is controlled by timer.
The measurement result of instruction multimeter is illustrated below.
With reference to Fig. 7, when measuring, multimeter host 1 sends third mould of the voltage value within the scope of third voltage value
Quasi- voltage signal gives the second control unit 23；Wherein, third voltage value range be setting above-mentioned range of voltage values, for greater than
Or it is equal to 0V and is less than or equal to 2.5V.After second control unit 23 receives analog voltage signal, judge that the analog voltage is believed
Number whether it is third analog voltage signal, specifically judges the voltage value of the analog voltage signal whether in third voltage value range
It is interior.If so, control measurement indicator 22 exports measurement result information.
Since third voltage value range and the first voltage value range are different, this can make third analog voltage
Signal comes with the first level signal and second electrical level signal distinguishing.It is deposited between the first voltage value range and third voltage value range
In certain vacant range；Specifically, by foregoing teachings it is found that third voltage value range is 0V to 2.5V, the first voltage value model
It encloses for 3V to 5V, there is the vacant range of (2.5V, 3V), between the two to avoid the erroneous judgement of communication signal.
During measurement, when having measuring gear switching, 1 ability of multimeter host sends first to test pencil 2 and leads to
Signal or the second communication signal are interrogated, sends third analog voltage signal, always if not switching to indicate measurement result.
In other embodiments: the first communication signal includes first level signal, and the content of the first communication signal is
" 0B1 ", representing current measuring gear is specified gear；Second communication signal includes a second electrical level signal, the second communication
The content of signal is " 0B0 ", and representing current measuring gear is the gear except specified gear.Certainly, the first communication signal and
The quantity for the level signal that second communication signal includes can also be three or more.
As described above, the first level signal and second electrical level signal are communication level；First level signal and second
The voltage value of level signal is within the scope of the first voltage value；But the duration of the first level signal and second electrical level signal is not
Together；In this way, the first level signal and second electrical level signal can be distinguished.Third analog voltage signal is used to indicate multimeter
The analog signal of measurement result.The range of the voltage value of third analog voltage signal and the first level signal and second electrical level signal
It is different.In this way, when through identical the first level signal of channel transfer, second electrical level signal and third analog voltage signal,
The first level signal, second electrical level signal and third analog voltage signal can be distinguished.Voltage can be generated by a circuit
Signal need to only distinguish two voltage models as the first level signal, second electrical level signal and third analog voltage signal, the circuit
It encloses, two voltage ranges also need to be only distinguished for the second control unit 23.
According to common practice, low and high level is two voltage ranges, along with analog voltage signal voltage range just
It is three voltage ranges.So, each voltage range is with regard to narrow.Voltage signal is influenced ratio by the external world during transmission
When such as by electromagnetic interference, voltage value can become smaller, it is possible to cause high level being mistaken for low level.In the present embodiment
In, the voltage range of voltage signal is two, and each voltage range can be arranged more wider, improves the anti-interference of signal
Ability.The present embodiment, which can be realized, transmits digital signal and analog signal by single channel, can simplify the structure of multimeter, can be improved
The anti-interference ability of signal.
In some embodiments, third voltage value range includes normal range ability and outranges range, if third mould
The voltage of quasi- voltage signal, which is located at, to be outranged in range, and the measurement output instruction measured value of indicator 22 exceeds the letter of current range
Breath, specially corresponding luminescent device shines on measurement indicator 22.As previously mentioned, third voltage value range is 0V to 2.5V,
Wherein, being more than or equal to 0V and being less than 2V is normal amount journey range, and being greater than or equal to 2V and being less than or equal to 2.5V is excess
Journey range.
5th embodiment
With reference to Fig. 4, test pencil plug 24 includes plug bond column 241, the signal of core wire connections different from conducting wire 25 respectively
Contact 242, the first power contact 243 and second source contact 244.In this way, conducting wire 25 is quad, namely there are four cores
Line.
With reference to Fig. 2, test pencil main body 20 further includes test pencil probe 26.
Plug bond column 241 is connect by a core wire of conducting wire 25 with test pencil probe 26.When plug bond column 241 and ten thousand
When being connected with table host 1, measuring signal or external signal can be transferred to multimeter host 1 by test pencil probe 26.
Signalling contact 242 is connect by a core wire of conducting wire 25 with test pencil main body 20, is specifically controlled with the second of test pencil 2
Unit 23 processed connects.When signalling contact 242 is connect with multimeter host 1, the second control unit 23 can receive multimeter master
The signal that machine 1 is sent.
After first power contact 243 and second source contact 244 are connect with multimeter host 1, pass through conducting wire 25 respectively
One core wire is the power supply of test pencil 2, is specifically shift indicator 21, measurement indicator 22 and the second control unit 23 are powered.The
One power contact 243 and second source contact 244 are specifically the contact 5V and the contact GND respectively.In this way, it is outer to have test pencil 2
The illumination functions of portion's power supply can be the LED illumination lamp power supply on test pencil 2, can avoid by battery on test pencil, and then can avoid
Bring is inconvenient when in use for the service life of battery and relatively coarse test pencil.
As it can be seen that test pencil plug 24 has power interface and communication interface.
With reference to Fig. 2, shift indicator 21 specifically includes the indicator light (not shown) that 20 one end of test pencil main body is arranged in
With leaded light device 211.Indicator light is a dual-colored LED lamp.Leaded light device 211 is specially to illuminate light-guiding pillar.It is surveyed using electric current
Indicator light is yellow when measuring gear, and indicator light is white when not using current measurement gear.In this way, measuring
When, user can also be used the shift indicator 21 on test pencil 2 to illuminate.
With reference to Fig. 2, measures indicator 22 and specifically include numerical identity 221, luminescence unit (not shown) and multiple fingers
Show portion 222.Numerical identity 221 is arranged on the shell 27 of test pencil main body 20.Instruction unit 222 is the instruction being provided on shell 27
Hole.Luminescence unit is located at the inside of shell 27.The light that luminescence unit issues can be by instruction unit 222, to play the work of instruction
With.Instruction unit 222 can also be the light-strip being looped around on shell 27, specifically around shell 27 1 weeks annular light-strips.
Indicator 22 is measured other than it can indicate by using LED light measured value, number can also be used
Pipe, LCD or liquid crystal display etc. indicate measured value.
Measurement indicator 22 is not limited by the second control unit 23 and is controlled, in other embodiments, measurement instruction
Device 22 is driven by electric resistance partial pressure or other analog circuits.
Sixth embodiment
The present embodiment provides a kind of computer readable storage medium, it is stored with the computer being used in combination with calculating equipment
Program, the computer program can be executed by processor to realize the above method.
The above content is combine it is specific/further detailed description of the invention for preferred embodiment, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, some replacements or modifications can also be made to the embodiment that these have been described,
And these substitutions or variant all shall be regarded as belonging to protection scope of the present invention.
Claims (10)
1. a kind of multimeter host of changeable test pencil, it is characterised in that: the multimeter host is equipped with two groups for for test pencil
The socket of insertion；It further include test pencil moving mass, guide part and first detection unit；The test pencil moving mass can be along the guide part
Movement；
The test pencil moving mass is equipped with two groups of movement contacts, and the fixed touching of multiple groups is equipped on the direction of guide part guiding
Point, wherein fixed contact described in every two groups is connected from different measuring circuits；
Movement contact described in two groups is connect with socket described in two groups respectively；Described in two groups movement contact can respectively from different two groups
The fixed contact contact, to be connected from different measuring circuits；
The first detection unit be used for the test pencil moving mass reach designated position when make the movement contact with it is corresponding
The measuring circuit conducting.
2. multimeter host according to claim 1, it is characterised in that the first detection unit is also used to: detecting
When corresponding with designated position locating for the test pencil moving mass function difference of the corresponding function of the key that is triggered, alarm signal is issued
Cease and/or disconnect the access where the movement contact.
3. multimeter host according to claim 1, it is characterised in that: the first detection unit includes multimeter mainboard
And position detecting circuit, the multimeter mainboard are connect with the position detecting circuit；The position detecting circuit is infrared inspection
Slowdown monitoring circuit is additionally provided with multiple detection holes on the direction of guide part guiding, and the infrared circuit can pass through the inspection
Gaging hole emits signal to detect whether the test pencil moving mass is located at the designated position.
4. multimeter host according to any one of claims 1 to 3, it is characterised in that: socket described in every group includes wiring
Jack and contact interface, the patch jack are connect with the movement contact；The test pencil moving mass is test pencil sliding block, described to lead
It is slideway to portion；The fixed contact is resilient conductive member, and the resilient conductive member is elastic conducting strip.
5. a kind of control method of the multimeter host of changeable test pencil, it is characterised in that: the multimeter host is equipped with two groups
Socket for being inserted into for test pencil；It further include test pencil moving mass, the test pencil moving mass is equipped with two groups of movement contacts, two groups of institutes
Movement contact is stated to connect with socket described in two groups respectively；
The control method includes:
When detecting that the test pencil moving mass is located at designated position, the movement contact is connected with corresponding measuring circuit.
6. control method according to claim 5, it is characterised in that further include: detecting the corresponding function of the key that is triggered
Can function difference corresponding with designated position locating for the test pencil moving mass when, disconnect it is described movement contact where access.
7. a kind of multimeter of changeable test pencil, it is characterised in that: including test pencil and according to claim 1 to described in 4 any one
Multimeter host, the test pencil with the multimeter host for connecting.
8. a kind of control method of the multimeter of changeable test pencil, it is characterised in that: including according to claim 5 or 6 described ten thousand
With the control method of table host；The multimeter includes test pencil and the multimeter host, and the test pencil is used for and the general-purpose
The connection of table host, the test pencil include shift indicator and measurement indicator；
The control method of the multimeter further include:
If current measuring gear is specified gear, the shift indicator output is controlled for indicating current measuring gear
It is the first information of specified gear；
Control the measurement indicator output measurement result information.
9. control method according to claim 8, it is characterised in that pass through identical channel:
The first communication signal is sent to control the shift indicator and export the first information；The second communication signal is sent to control
The shift indicator output is made for indicating that current measuring gear is the second information of the gear except specified gear；It is described
First communication signal and second communication signal include at least one first level signal and/or at least one second electrical level
Signal；The voltage value of first level signal and the second electrical level signal is within the scope of the first voltage value；Described first
Level signal continues first time length, and the second electrical level signal continues the second time span；
Third analog voltage signal of the voltage value within the scope of third voltage value is sent to control measurement indicator output institute
State measurement result information；
The first time length is different time spans from second time span；The third voltage value range and institute
Stating the first voltage value range is different range of voltage values.
10. a kind of computer readable storage medium is stored with the computer program being used in combination with calculating equipment, the calculating
Machine program can be executed by processor to realize claim 5 or 6 or 8 or 9 the methods.
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| CN201910350694.4A CN109959813B (en) | 2019-04-28 | 2019-04-28 | Multimeter capable of switching meter pens, host and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910350694.4A CN109959813B (en) | 2019-04-28 | 2019-04-28 | Multimeter capable of switching meter pens, host and control method thereof |
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| CN109959813A true CN109959813A (en) | 2019-07-02 |
| CN109959813B CN109959813B (en) | 2022-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693747A (en) * | 2020-07-23 | 2020-09-22 | 上海四达电子仪表有限公司 | Universal meter |
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