CN106568997B - A kind of multimeter current range method for handover control and device - Google Patents
A kind of multimeter current range method for handover control and device Download PDFInfo
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- CN106568997B CN106568997B CN201611004788.9A CN201611004788A CN106568997B CN 106568997 B CN106568997 B CN 106568997B CN 201611004788 A CN201611004788 A CN 201611004788A CN 106568997 B CN106568997 B CN 106568997B
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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
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
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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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Abstract
This application discloses a kind of multimeter current range switching devices, it include: first switch module, second switch module, first passage, second channel, third channel and controller, first switch module is connected between current input terminal and first passage and second channel, control first passage and the second logical on-off, second switch module is connected between current input terminal and third channel, control the on-off of third channel, controller is connected with first switch module and second switch module respectively, control first switch module action or second switch module action, so that the channel of a non-present current range is first connected, make the channel conductive of target current range again, it realizes under the premise of not breaking, it is staggered the switch motion time, avoid occurring open circuit in range handoff procedure, solve existing method in because of caused by open circuit test leakage and mistake The problems such as survey, so that multimeter performance is more stable.Correspondingly, multimeter current range method for handover control is also disclosed in the application.
Description
Technical field
This application involves electronic instrumentations, and in particular to a kind of multimeter current range method for handover control and device.
Background technique
Multimeter is also known as universal metre or multimeter, is common power electronics measuring instrumentss, is that one kind is used to measure electricity
The moving- coil instrument of a variety of electricity parameters such as stream, voltage and resistance generally has several ranges for each electricity parameter,
It is mainly made of gauge outfit, measuring circuit and selection switch, passes through the transformation of selection switch, it is convenient to realize different electricity parameters
And its switching between different ranges.In current range switching, traditional way is usually by controlling multiple switch simultaneously
Act the switching to realize range.But since the movement of switch contact needs certain time, traditional way be will lead to multiple
In the switch simultaneously operation time, there is open circuit in the current measurement channel inside multimeter.Although this breaking time only has several hundred
Nanosecond is easy to bring following several bad phenomenons to several milliseconds:
(1) interruption and test leakage for leading to measurement, to cause to judge by accident to measurement result, for example, using multimeter to power supply
When module output current measures, the waveform of power module output current is observed with oscillograph, under can be appreciated that waveform has obviously
The phenomenon that falling into certain time, this is because the test leakage data of breaking that time, are easy to cause user to query power module
Performance；
(2) cause to measure wrong data, to cause to judge by accident to measurement result, for example, carrying out current measurement to circuit
When, the moment of switch electric shock closure can generate a current rush, and the current rush is larger, needs to exclude, but because multimeter
Sample rate it is higher, the current rush can be collected, so that there are wrong data for the obtained current data of measurement.
Summary of the invention
In order to solve in the prior art current range switching when because occur open circuit caused by measurement interrupt, test leakage and accidentally survey
The problems such as, the application provides a kind of multimeter current range method for handover control and device, in the wink for carrying out current range switching
Between have always circuit be on state, avoid because range switch occur measurement interrupt, test leakage and accidentally survey phenomena such as.
According to a first aspect of the present application, the application provides a kind of multimeter current range method for handover control, for controlling
Multimeter processed switches to target current range from current flow range, and the current flow range is to switch locating for preceding multimeter
Current range, the target current range are current range locating for multimeter after switching, the corresponding range in a channel, institute
Stating channel, at least there are two, it can be achieved that switching between at least two ranges；The described method includes: according to current flow range and
Target current range is acted by control switch so that channel disconnection or conducting, realize the switching of multimeter current range；
Specifically, it is determined that current flow range and target current range；When receiving range switching request signal, first control one is non-
The channel conductive of current flow range；Control switch acts again, is held on the channel of target current range；Control switch again
Movement, disconnects the channel of non-targeted current range.
The application provides another multimeter current range method for handover control, for range there are three have multimeter from
Microampere range or milliampere range switch to an ampere range, and the corresponding channel of a range, microampere range and milliampere range are corresponding
Channel be adjacency channel, the adjacency channel by two-way selection switch control its be turned on or off；The described method includes: passing through
Control switch acts so that channel disconnection or conducting, realize the switching of multimeter current range；Specifically, when the amount of receiving
When journey switching request signal, ampere range channel conductive is controlled；A microampere range channel is controlled again to disconnect and make a milliampere range channel
Conducting.
According to a second aspect of the present application, the application provides a kind of multimeter current range switching control, for controlling
Multimeter processed switches to target current range from current flow range, and the current flow range is to switch locating for preceding multimeter
Current range, the target current range are range locating for multimeter after switching, and the corresponding range in a channel is described logical
At least there are two, it can be achieved that switching between at least two ranges in road；Described device includes: first switch module, second switch
Module, first passage, second channel, third channel, post processing electric circuit and controller；
The first switch module is connected between current input terminal and first passage and second channel, described for controlling
First passage and the second logical on-off, the second switch module is connected between current input terminal and third channel, for controlling
Make the on-off of the third channel；
The post processing electric circuit is connected with the first passage, second channel, third channel and the controller respectively
It connects, for generating range switching request signal according to current flow range and target current range, by the range switching request
Signal is transmitted to the controller；
The controller is connected with the post processing electric circuit, first switch module and second switch module respectively, uses
Signal is controlled in generating on-off according to the range switching request signal, controls the first switch module action or second switch
Module action so that the channel of a non-present current range is first connected, then makes the channel conductive of target current range.
In some embodiments, the first switch module includes two one-way switches, the input terminal of two one-way switches
Current input terminal is connected, output end is separately connected first passage and second channel, and two one-way switches are switched by switch state,
First passage and second channel is set to be connected to or disconnect with current input terminal.
In some embodiments, first passage and the corresponding current range of second channel are adjacent current range, described the
One switch module is that two-way selection switchs, the input terminal connection current input terminal of first switch module, the two of first switch module
A output end is separately connected first passage and second channel, and first switch module is switched by switch state, makes described first to lead to
Only one channel is connected to current input terminal in road and second channel and another channel and current input terminal disconnect.
In some embodiments, the second switch module is two-way selection switch, and the input terminal of second switch module connects
Current input terminal is connect, two output ends of second switch module are separately connected third channel and free end, and second switch module is logical
Switch state switching is crossed, the third channel is made to be connected to or disconnect with current input terminal.
In some embodiments, first passage, second channel and the corresponding current range of third channel are respectively microampere, milli
Peace and ampere, when current range is switched to milliampere hour by microampere, the second switch module, which first carries out state switching, makes described the
Triple channel conducting, the first switch module carries out state switching again disconnects the second channel conducting, first passage, described
Second switch module carries out state switching again disconnects the third channel；When current range is switched to microampere by milliampere,
The second switch module, which first carries out state switching, is connected the third channel, and the first switch module carries out state again and cuts
Changing disconnects the first passage conducting, second channel, and the second switch module carries out state switching again makes the third
Channel disconnects；When current range is switched to ampere-hour by microampere, the second switch module, which first carries out state switching, makes described the
Triple channel conducting, the first switch module carries out state switching again disconnects the second channel conducting, first passage；Work as electricity
When flow journey is switched to microampere by ampere, the first switch module, which first carries out state switching, leads the first passage
Logical, second channel disconnects, and second switch module carries out state switching again disconnects the third channel；When current range is by milliampere
It is switched to ampere-hour, the second switch module, which carries out state switching, is connected the third channel；When current range is pacified by training
It is switched to milliampere hour, the second switch module, which carries out state switching, disconnects the third channel.
It in some embodiments, further include timer, the timer is connected with the controller, for timing to be arranged
Period, a switch motion are completed within a time-count cycle.
Device as described in any one of claim 6 to 9, which is characterized in that the post processing electric circuit includes electric current
Detection module, the both ends of the current detection module are connected with the post processing electric circuit and the controller respectively, are used for
The present current value of post processing electric circuit is detected, and the current value is transmitted to the controller, is exceeded in present current value
When current flow range, range switching request signal is generated.
In some embodiments, the post processing electric circuit further include: high speed electronic switch, operational amplifier and modulus turn
Parallel operation；
The high speed electronic switch is used to generate range switching request switching signal according to target current range；
The operational amplifier is used to carry out operation, amplification and filtering to the range switching request switching signal；
The analog-digital converter is used to carry out analog-to-digital conversion to the range switching request switching signal, generates digital
Range switching request signal.
The beneficial effect of the application is: multimeter current range method for handover control and device provided by the present application pass through control
Device processed issues on-off when according to range switching request signal or the electric current detected being more than current range and controls signal, and utilizes meter
When device carry out timing, first control a non-present current range conduit；Control switch acts again, makes the logical of target current range
Road is held on；Control switch acts again, disconnects the channel of non-targeted current range；Under the premise of not breaking, so that opening
The time of pass movement is staggered, rather than multiple switch moves at the same time as in existing method, to switch in current range
Breaking phenomena is avoided in journey, solve in existing method interrupted because of caused by open circuit, test leakage and the problems such as accidentally survey, control effect
Fruit is more preferable, measurement performance is more stable.
Detailed description of the invention
Fig. 1 is a kind of multimeter current range switching control structural block diagram provided by the present application；
Fig. 2 is a kind of multimeter current range switching control circuit diagram provided by the present application；
Fig. 3 is a kind of structural frames of the post processing electric circuit of multimeter current range switching control provided by the present application
Figure；
Fig. 4 is that each channel on-off becomes in a kind of multimeter current range switching control handoff procedure provided by the present application
Change schematic diagram；
Fig. 5 is a kind of multimeter current range method for handover control flow chart provided by the present application；
Fig. 6 is another multimeter current range method for handover control flow chart provided by the present application；
Fig. 7 is another multimeter current range switching control structural block diagram provided by the present application；
Fig. 8 is each channel on-off in another multimeter current range switching control handoff procedure provided by the present application
Change schematic diagram；
Fig. 9 is control flow in another multimeter current range switching control handoff procedure provided by the present application
Figure.
Specific embodiment
The application is described in further detail below by specific embodiment combination attached drawing.
Current measuring method in multimeter instrument generallys use Precision measurement resistance+amplifier mode, in known resistance
Resistance value, by measuring the voltage at current flowing resistance both ends, then by Ohm's law I=U/R, actual current can be measured
Value.This measurement method is at low cost, precision is high, small in size.It in this way, be in view of detection resistance is by power ginseng
The influence of the factors such as number, design cost, so needing to select different detection resistances according to measurement size of current, forming difference
Measurement channel, to switch different ranges.
Embodiment one:
With reference to Fig. 1 and Fig. 2, a kind of multimeter current range switching control is present embodiments provided, for controlling ten thousand
Target current range is switched to from current flow range with table, the current flow range is amount locating for multimeter before switching
Journey, the target current range are range locating for multimeter after switching；The device includes first switch module 31, second switch
Module 32, post processing electric circuit 50, controller 10, timer 20 and first passage 41, second channel 42, third channel 43,
Free end 44；The corresponding range in one channel at least needs to have 2 channels to realize the purpose of range switching, can be real
Switching between existing at least two ranges.
First switch module 31 is two-way selection switch, and second switch module 32 is that two-way selects switch or one-way switch,
In the present embodiment, first switch module 31 and second switch module 32 are two-way selection switch.Preferably, first switch module
31 be the first relay 310, and second switch module 32 is the second relay 320.
The input terminal of first relay 310 is connected with current input terminal and controller 10 respectively, the first relay 310
Two output ends are separately connected first passage 41 and second channel 42, by receive controller 10 on-off control signal, first
Relay 310 carries out switch state switching, connects only one channel and current input terminal in first passage 41 and second channel 42
Lead to and another channel and current input terminal disconnection.
The input terminal of second relay 320 is connected with current input terminal and controller 10 respectively, the second relay 320
Two output ends are separately connected third channel 43 and free end 44, by receive controller 10 on-off control signal, second after
Electric appliance 320 carries out switch state switching, and third channel 43 is made to be connected to or disconnect with current input terminal, and free end 44 breaks always
It opens.
Since free end 44 is always to disconnect, corresponding free end 44 is sky range；First passage 41 is by first resistor R1
And its circuit is constituted, corresponding microampere (uA) range；Second channel 42 is made of second resistance R2 and its circuit, corresponding milliampere (mA)
Range；Third channel 43 is made of 3rd resistor R3 and its circuit, corresponding ampere (A) range.The measurable electric current model of uA range
Enclose that smaller, the measurable current range of A range is larger, under identical voltage conditions, first resistor R1 answers larger, 3rd resistor R3
Should be smaller, for example, resistance value ratio R1:R2:R3=100:1:0.01.Device provided in this embodiment tool there are three channel, it can be achieved that
Switching between three ranges, i.e. switching between uA, mA and A range.
Post processing electric circuit 50 is connected with first passage 41, second channel 42, third channel 43 and controller 10 respectively,
For generating range switching request signal according to current flow range and target current range, by the range switching request signal
It is transmitted to the controller 10.
As shown in figure 3, being a kind of post processing electric circuit structural block diagram provided by the present application, which includes
Sequentially connected high speed electronic switch 501, current detection module 502, operational amplifier 503 and analog-digital converter 504.
High speed electronic switch 501 is used to generate range switching request switching signal according to target current range；Operation amplifier
Device 503 is used to carry out operation, amplification and filtering to range switching request switching signal；Analog-digital converter 504 is for cutting range
It changes request switching signal and carries out analog-to-digital conversion, generate digital range switching request signal convenient for the processing of controller 10.
The both ends of current detection module 502 are connected with post processing electric circuit 50 and controller 10 respectively, after detecting
The present current value of grade processing circuit 50, when present current value exceeds current flow range, output range switching request mark
Position is to controller 10.
Timer 20 is connected with controller 10, for time-count cycle to be arranged, opens timing, timing week by controller 10
Phase is greater than the actuation time of the first relay 310 and the second relay 320.Because general relay needs 3 milliseconds, to guarantee relay
Device completion is discharged into and another side stationary contact closed action from one side contact, it is preferable that time-count cycle is 5 milliseconds.
The both ends of controller 10 are also connected with post processing electric circuit 50, the first relay 310 and the second relay 320 respectively
It connects, signal is controlled for generating on-off according to range switching request signal, thus the first relay 310 of control or the second relay
320 carry out switch state switching, realize the purpose of range switching.Therefore, device provided by the present application not only can be according to user's
Artificial selection determines target current range, realizes current range manual switching, can also be according to the size of current value by controlling
Device 10 automatically determines target current range, realizes that current range automatically switches.Controller 10 is generating range switching request mark
Behind position, controller 10 opens timer 20 and carries out timing, exports one or more on-off and controls signal, makes a non-present electric current
The channel of range is first connected, then makes the channel conductive of target current range, finally disconnects the channel of non-targeted current range, keeps away
Exempt from occur breaking phenomena in handoff procedure.
In the switching of controlling electricity journey, in some cases, non-present current range is the channel of target current range；Or
Person's non-present current range is the channel of target current range, and the channel conductive of target current range and non-targeted current range
Channel disconnect and meanwhile occur.Below with reference to Fig. 4 and Fig. 5, it is described in detail.
As shown in figure 4, in handoff procedure between three ranges of the present embodiment each channel on-off situation of change,
In, black circle represents channel as on state, and white circle represents channel as off-state.
As shown in figure 5, being a kind of multimeter current range method for handover control flow chart provided by the present application, including step
It is rapid:
Step 100, current flow range and target current range are determined；When receiving range switching request signal
When, first control the channel conductive of a non-present current range；
Step 200, then control switch acts, and is held on the channel of target current range；
Step 300, then control switch acts, and disconnects the channel of non-targeted current range.
Situation one: referring to Fig. 4 (a), and the on-off situation of change in each channel during mA range is switched to for uA range；When
The channel of preceding current range is first passage 41, in the conductive state, and the channel of target current range is second channel 42, is in
Off-state.In handoff procedure, specific control method includes:
Step 1001, when receiving range switching request signal, controller 10 opens timer 20 and carries out continuous timing,
When first time-count cycle starts, signal is controlled to 320 1 on-off of the second relay, so that the third of non-present current range
Channel 43 is connected, and free end 44 is still disconnection；
Step 2001, at the end of first time-count cycle, then start second time-count cycle, and give the first relay
310 1 on-off control signal, so that the channel conductive of target current range, i.e. second channel 42 are connected, while first passage
41 disconnect；
Step 3001, at the end of two time-count cycles, then give the second relay 320 1 on-off control signals, so that
The third channel 43 of non-targeted current range disconnects, and free end 44 is still disconnection.
It can be seen that just completing uA range within three time-count cycles switches to mA range, while also ensuring switch and existing
It is not breaking during movement.
Situation two: referring to Fig. 4 (b), and the on-off situation of change in each channel during uA range is switched to for mA range；When
The channel of preceding current range is second channel 42, in the conductive state, and the channel of target current range is first passage 41, is in
Off-state.In handoff procedure, specific control method includes:
Step 1002, when receiving range switching request signal, controller 10 opens timer 20 and carries out continuous timing,
When first time-count cycle starts, signal is controlled to 320 1 on-off of the second relay, so that the third of non-present current range
Channel 43 is connected, and free end 44 is still disconnection；
Step 2002, at the end of first time-count cycle, then start second time-count cycle, and give the first relay
310 1 on-off control signal, so that the channel conductive of target current range, i.e. first passage 41 are connected, while second channel
42 disconnect；
Step 3002, at the end of two time-count cycles, then give the second relay 320 1 on-off control signals, so that
The third channel 43 of non-targeted current range disconnects, and free end 44 is still disconnection.
It can be seen that just completing uA range within three time-count cycles switches to mA range, while also ensuring switch and existing
It is not breaking during movement.
Situation three: referring to Fig. 4 (d), and the on-off situation of change in each channel during uA range is switched to for A range；When
The channel of preceding current range is third channel 43, in the conductive state, and the channel of target current range is first passage 41, is in
Off-state separately has second channel 42 in the conductive state.In handoff procedure, specific control method includes:
Step 1003, when receiving range switching request signal, controller 10 opens timer 20 and carries out continuous timing,
When first time-count cycle starts, signal is controlled to 310 1 on-off of the first relay, so that the first of non-present current range
Channel 41 is connected, and second channel 42 disconnects；
At this point, i.e. first passage 41 is same since the channel of non-present current range is exactly the channel of target current range
When for the channel of non-present current range and the channel of target current range, the channel of target current range has been turned on, therefore,
Step 200 is completed simultaneously in step 1003, next executes step 300, specifically,
Step 3003, at the end of a time-count cycle, then give the second relay 320 1 on-off control signals, so that
The third channel 43 of non-targeted current range disconnects, and free end 44 is still off.
It can be seen that just completing A range within two time-count cycles switches to uA range, while switch is also ensured dynamic
It is not breaking during work.
Situation four: referring to Fig. 4 (f), and the on-off situation of change in each channel during mA range is switched to for A range；When
The channel of preceding current range is third channel 43, in the conductive state, and the channel of target current range is second channel 42, is in
On state, another first passage 41 are in an off state.In handoff procedure, specific control method includes:
For current range A range, second channel 42 is both turned on third channel 43, and due to non-present current range
Channel is exactly the channel of target current range, i.e. second channel 42 is simultaneously the channel of non-present current range and target current
The channel of range, before the handover, the channel of non-present current range and the channel of target current range have been turned on, therefore, step
Rapid 100 and step 200 be completed；Step 300 is directly executed, specifically,
Step 3004, when receiving range switching request signal, controller 10 opens 20 1 time-count cycles of timer
Timing when timing starts, controls signal to 320 1 on-off of the second relay, so that the third channel of non-present current range
43 disconnect, and free end 44 is still off.
It can be seen that just completing A range within a time-count cycle switches to mA range, while switch is also ensured dynamic
It is not breaking during work.
In the present embodiment, there are three ranges, i.e. uA range, mA range and A range for multimeter tool, since a range is corresponding
One channel, microampere range and the corresponding first passage 41 of milliampere range and second channel 42 are adjacency channel, the two are adjacent
Channel carries out switch state switching by the first relay 310, only disconnects a channel in first passage 41 and second channel 42,
And it can not accomplish two channels and disconnect.Therefore, it is in A range, second channel 42 is both turned on third channel 43, is equivalent to the
Two resistance R2 and 3rd resistor R3 are in parallel, and since input current is constant, the voltage value at two resistance both ends is equal, known second
In the state of resistance R2 and 3rd resistor R3 resistance value, the voltage value by measuring resistance both ends, which can be extrapolated, actually enters measurement electricity
Stream.Although being likely to occur some errors after second resistance R2 and 3rd resistor R3 are in parallel, which passes through instrument calibration
It may be implemented to eliminate error.For example, when R2=1 Ω, R3=0.01 Ω, R2 ∥ R3 ≈ 0.0099 is similar to R1.
It should be pointed out why selecting first passage 41 to disconnect and the conducting of second channel 42, so that second resistance R2
It is in parallel with 3rd resistor R3, be because first resistor R1 measurement be uA rank signal, need using bigger resistance, such as
100Ω.When resistance is bigger, due to power factor (PF) constrain, allow by electric current it is smaller, high current cannot be born,
Otherwise easily burn, and 3rd resistor R3 measurement be A rank signal, electric current is larger, and first resistor R1 and 3rd resistor R3 are simultaneously
Join dangerous.
Therefore, A range is switched to for uA range and mA range switches to A range both of these case, method for handover control
Different with the above method, difference is that target current range has been determined as A range and step 300 no longer needs.Specifically
Situation combination Fig. 4 and Fig. 6 are illustrated.
As shown in fig. 6, for another multimeter current range method for handover control flow chart provided by the present application, including step
It is rapid:
Step 101, when receiving range switching request signal, ampere range channel conductive is controlled, i.e. control third amount
43 channel conductive of journey；
Step 201, it then controls a microampere range channel and disconnects and make a milliampere range channel conductive, i.e., control first passage 41 again
It disconnects and second channel 42 is connected.
Situation five: referring to Fig. 4 (c), and the on-off situation of change in each channel during A range is switched to for uA range；When
The channel of preceding current range is first passage 41, in the conductive state, and the channel of target current range is third channel 43, is in
Off-state.In handoff procedure, specific control method includes:
Step 1015, when receiving range switching request signal, controller 10 opens timer 20 and carries out continuous timing,
When first time-count cycle starts, signal is controlled to 320 1 on-off of the second relay, so that third channel 43 is connected；
Step 2015, at the end of a time-count cycle, then give the first relay 310 1 on-off control signals, so that
First passage 41 disconnects, and second channel 42 is connected.
It can be seen that just completing uA range within two time-count cycles switches to A range, while switch is also ensured dynamic
It is not breaking during work.
Situation six: referring to Fig. 4 (e), and the on-off situation of change in each channel during A range is switched to for mA range；When
The channel of preceding current range is second channel 42, in the conductive state, and the channel of target current range is third channel 43, is in
Off-state.In handoff procedure, specific control method includes:
Step 1016, when receiving range switching request signal, controller 10 opens timer 20 and carries out continuous timing,
When first time-count cycle starts, signal is controlled to 320 1 on-off of the second relay, so that third channel 43 is connected；
Step 2016, before switching, first passage 41 has been disconnected and second channel 42 has been connected, controller 10 no longer need to
First relay 310 issues on-off and controls signal.
It can be seen that just completing mA range within a time-count cycle switches to A range, while switch is also ensured dynamic
It is not breaking during work.
Embodiment two:
With reference to Fig. 7, another multimeter current range switching control is present embodiments provided.The device includes first
Switch module 31, second switch module 32, post processing electric circuit 50, controller 10, timer 20 and first passage 41, second
Channel 42, third channel 43；The corresponding range in one channel.
In the present embodiment, first switch module 31 is two one-way switches, respectively first switch 311, second switch
312；Second switch module 32 is a way switch, i.e. third switch 321.The both ends of first switch 311 respectively with controller 10
It is connected with first passage 41, the both ends of second switch 312 are connected with controller 10 and second channel 42 respectively, third switch
321 both ends are connected with controller 10 and third channel 43 respectively, first switch 311, second switch 312 and third switch
321 control signal progress on-off line operation by receiving the on-off of controller 10, control first passage 41,42 and of second channel respectively
The on-off of third channel 43.The input terminal of first switch 311, second switch 312 and third switch 321 is also and current input terminal
It is connected, for receiving the electric current of object to be measured.
As shown in Fig. 2, the composition and embodiment of first passage 41, second channel 42 and third channel 43 in the present embodiment
One is identical, can also realize the switching between three ranges, i.e. switching between uA, mA and A range；With reference to shown in Fig. 3 and Fig. 6,
Post processing electric circuit 50 is the same as example 1 in the present embodiment；Timer 20 is also the same as example 1, related content, no longer
It repeats.
It is also opened respectively with post processing electric circuit 50, first switch 311, second switch 312 and third at the both ends of controller 10
It closes 321 to be connected, is used to generate range switching request flag bit according to range switching request signal, or by judging current detecting
The current value size that module 502 detects generates range switching request flag bit when current value exceeds current flow range,
Signal is controlled further according to on-off is generated the range switching request flag bit and time-count cycle, to control first switch 311, the
Two switches 312 or third switch 321 carry out on-off line operation, realize the purpose of range switching.Therefore, device provided by the present application is not
Target current range can be only determined according to the artificial selection of user, realize current range manual switching, it can also be according to electric current
The size of value automatically determines target current range by controller 10, realizes that current range automatically switches.Controller 10 is in production quantity
After journey switching request flag bit, controller 10 opens timer 20 and carries out timing, and output on-off controls signal, makes a non-present
The channel of current range is first connected, then makes the channel conductive of target current range, finally makes the channel of non-targeted current range disconnected
It opens.
Preferably, the channel of non-present current range is the channel of target current range, the channel of non-targeted current range
For the channel of current flow range.Therefore, control method in embodiment one can be simplified, controller 10 exports on-off control letter
Number, the channel of current range is not turned off first and makes the channel conductive of target current range, makes the logical of current flow range again later
Road disconnects, and avoids occurring breaking phenomena in handoff procedure.Below with reference to Fig. 8 and Fig. 9, it is described in detail.
As shown in figure 8, in handoff procedure between three ranges of the present embodiment each channel on-off situation of change,
In, black circle represents channel as on state, and white circle represents channel as off-state.
As shown in figure 9, being a kind of multimeter current range method for handover control flow chart provided by the present application, including step
It is rapid:
Step 102, the channel of current range is not turned off first and make the channel conductive of target current range；
Step 202, after the channel conductive of target current range, then disconnect the channel of current flow range.
Situation one: referring to Fig. 8 (a), and the on-off situation of change in each channel during mA range is switched to for uA range.
The channel of current flow range is first passage 41, in the conductive state, and the channel of target current range is second
Channel 42, is in an off state.In handoff procedure, specific control method includes: first first passage 41 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 312 1 on-off of second switch, so that second channel 42 is connected；
At the end of first time-count cycle, after second channel 42 has been connected, then start second time-count cycle, gives first switch 311
One on-off controls signal, so that first passage 41 disconnects.
Situation two: referring to Fig. 8 (b), and the on-off situation of change in each channel during uA range is switched to for mA range.
The channel of current flow range is second channel 42, in the conductive state, and the channel of target current range is first
Channel 41, is in an off state.In handoff procedure, specific control method includes: first second channel 42 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 311 1 on-off of first switch, so that first passage 41 is connected；
At the end of first time-count cycle, after first passage 41 has been connected, then start second time-count cycle, gives second switch 312
One on-off controls signal, so that second channel 42 disconnects.
Situation three: referring to Fig. 8 (c), and the on-off situation of change in each channel during A range is switched to for uA range.
The channel of current flow range is first passage 41, in the conductive state, and the channel of target current range is third
Channel 43, is in an off state.In handoff procedure, specific control method includes: first first passage 41 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 321 1 on-off of third switch, so that third channel 43 is connected；
At the end of first time-count cycle, after third channel 43 has been connected, then start second time-count cycle, gives first switch 311
One on-off controls signal, so that first passage 41 disconnects.
Situation four: referring to Fig. 8 (d), and the on-off situation of change in each channel during uA range is switched to for A range.
The channel of current flow range is third channel 43, in the conductive state, and the channel of target current range is first
Channel 41, is in an off state.In handoff procedure, specific control method includes: first third channel 43 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 311 1 on-off of first switch, so that first passage 41 is connected；
At the end of first time-count cycle, after first passage 41 has been connected, then start second time-count cycle, to third switch 321
One on-off controls signal, so that third channel 43 disconnects.
Situation five: referring to Fig. 8 (e), and the on-off situation of change in each channel during A range is switched to for mA range.
The channel of current flow range is second channel 42, in the conductive state, and the channel of target current range is third
Channel 43, is in an off state.In handoff procedure, specific control method includes: first second channel 42 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 321 1 on-off of third switch, so that third channel 43 is connected；
At the end of first time-count cycle, after third channel 43 has been connected, then start second time-count cycle, gives second switch 312
One on-off controls signal, so that second channel 42 disconnects.
Situation six: referring to Fig. 8 (f), and the on-off situation of change in each channel during mA range is switched to for A range.
The channel of current flow range is third channel 43, in the conductive state, and the channel of target current range is second
Channel 42, is in an off state.In handoff procedure, specific control method includes: first third channel 43 to be kept to be connected and connected
Continuous timing when first time-count cycle starts, controls signal to 312 1 on-off of second switch, so that second channel 42 is connected；
At the end of first time-count cycle, after second channel 42 has been connected, then start second time-count cycle, to third switch 321
One on-off controls signal, so that third channel 43 disconnects.
In conclusion multimeter current range method for handover control provided by the present application and device are by controller according to amount
Journey switching request signal or the electric current detected issue on-off when being more than current range and control signal, and are counted using timer
When, first control the conduit of a non-present current range；Control switch acts again, and the channel of target current range is made to keep leading
It is logical；Control switch acts again, disconnects the channel of non-targeted current range；Under the premise of not breaking, so that switch motion
Time is staggered, rather than multiple switch moves at the same time as in existing method, to avoid in current range handoff procedure
Breaking phenomena, solve in existing method interrupted because of caused by open circuit, test leakage and the problems such as accidentally survey, control effect is more preferable,
Measurement performance is more stable.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is only limited to these instructions.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of from the present application design, a number of simple deductions or replacements can also be made.
Claims (4)
1. a kind of multimeter current range switching control switches to target electricity from current flow range for controlling multimeter
Flow journey, the current flow range are current range locating for multimeter before switching, and the target current range is after switching
Range locating for multimeter, the corresponding range in channel, the channel at least there are two, it can be achieved that at least two ranges it
Between switching；Described device include: first switch module, second switch module, first passage, second channel, third channel, after
Grade processing circuit and controller；It is characterized in that,
The first switch module is connected between current input terminal and first passage and second channel, for controlling described first
The on-off in channel and second channel, the second switch module is connected between current input terminal and third channel, for controlling
The on-off of the third channel；
The post processing electric circuit is connected with the first passage, second channel, third channel and the controller respectively, uses
In generating range switching request signal according to current flow range and target current range, the range switching request signal is passed
Transport to the controller；
The controller is connected with the post processing electric circuit, first switch module and second switch module respectively, is used for root
On-off is generated according to the range switching request signal and controls signal, controls the first switch module action or second switch module
Movement, so that the channel of a non-present current range is first connected, then makes the channel conductive of target current range；
The first passage is made of first resistor R1 and its circuit, corresponding microampere range；The second channel is by second resistance
R2 and its circuit are constituted, corresponding milliampere range；The third channel is made of 3rd resistor R3 and its circuit, corresponding ampere amount
Journey；The first resistor R1, second resistance R2,3rd resistor R3 meet R1:R2:R3=100:1:0.01；
The first passage and the corresponding current range of second channel are adjacent current range, and the first switch module is two-way
The input terminal of selection switch, first switch module connects current input terminal, and two output ends of first switch module are separately connected
First passage and second channel, first switch module are switched by switch state, are made in the first passage and second channel only
One channel is connected to current input terminal and another channel and current input terminal disconnect；
The second switch module is two-way selection switch, and the input terminal of second switch module connects current input terminal, and second opens
Two output ends for closing module are separately connected third channel and free end, and second switch module is switched by switch state, make institute
Third channel is stated to be connected to or disconnect with current input terminal；
When current range is switched to milliampere hour by microampere, the second switch module, which first carries out state switching, makes the third channel
Conducting, the first switch module carries out state switching again disconnects the second channel conducting, first passage, and described second opens
Pass module carries out state switching again disconnects the third channel；When current range is switched to microampere by milliampere, described
Two switch modules, which first carry out state switching, is connected the third channel, and the first switch module carries out state switching again makes institute
First passage conducting, second channel disconnection are stated, the second switch module carries out state switching again keeps the third channel disconnected
It opens；When current range is switched to ampere-hour by microampere, the second switch module, which first carries out state switching, makes the third channel
Conducting, the first switch module carries out state switching again disconnects the second channel conducting, first passage；Work as current range
When being switched to microampere by ampere, the first switch module, which first carries out state switching, makes the first passage conducting, second channel
It disconnects, second switch module carries out state switching again disconnects the third channel；When current range is switched to ampere by milliampere
When, the second switch module, which carries out state switching, is connected the third channel；When current range is switched to milliampere by ampere
When, the second switch module, which carries out state switching, disconnects the third channel.
2. device as described in claim 1, which is characterized in that it further include timer, the timer and the controller phase
Connection, for time-count cycle to be arranged, a switch motion is completed within a time-count cycle.
3. device as described in claim 1, which is characterized in that the post processing electric circuit includes current detection module, described
The both ends of current detection module are connected with the post processing electric circuit and the controller respectively, for detecting rear class processing electricity
The present current value on road, and the current value is transmitted to the controller, when present current value exceeds current flow range,
Generate range switching request signal.
4. device as claimed in claim 3, which is characterized in that the post processing electric circuit further include: high speed electronic switch, fortune
Calculate amplifier and analog-digital converter；
The high speed electronic switch is used to generate range switching request switching signal according to target current range；
The operational amplifier is used to carry out operation, amplification and filtering to the range switching request switching signal；The modulus
Converter is used to carry out analog-to-digital conversion to the range switching request switching signal, generates digital range switching request letter
Number.
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| CN108931336A (en) * | 2017-05-23 | 2018-12-04 | 北京航天计量测试技术研究所 | A kind of high stability pressure control algorithm |
| CN109633231A (en) * | 2018-12-29 | 2019-04-16 | 中国电子科技集团公司第十二研究所 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
| CN110888097B (en) * | 2019-11-13 | 2022-03-18 | 广东电网有限责任公司广州供电局 | Line switching method and device |
| CN111431514B (en) * | 2020-06-11 | 2020-09-29 | 深圳市鼎阳科技股份有限公司 | Broadband buffering analog switch circuit and integrated circuit |
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Address after: 518000 Guangdong Province, Baoan District, Baoan District, Xin'an Street, Xingdong Community, 68 District, Antongda Industrial Factory Area, 4 factories, 3 floors, 5 office buildings, 1-3 floors Patentee after: Shenzhen dingyang Technology Co., Ltd Address before: Shenzhen City, Guangdong province Baoan District 518000 District 68 road left three Antongda Industrial Park, 4 floor Patentee before: Shenzhen Siglent Technologies Co., Ltd. |