CN109061266A - Multiplexing functions circuit board and digital multimeter for digital multimeter - Google Patents
Multiplexing functions circuit board and digital multimeter for digital multimeter Download PDFInfo
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- CN109061266A CN109061266A CN201811259802.9A CN201811259802A CN109061266A CN 109061266 A CN109061266 A CN 109061266A CN 201811259802 A CN201811259802 A CN 201811259802A CN 109061266 A CN109061266 A CN 109061266A
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- 238000003466 welding Methods 0.000 claims abstract description 91
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
Abstract
The present invention discloses a kind of multiplexing functions circuit board and digital multimeter for digital multimeter.Multiplexing functions circuit board for digital multimeter is equipped with transistor interface device, multiple switch, multiple resistance welding positions for welding kesistance；The transistor interface device is made of a NPN transistor and a PNP transistor and has eight pins, by the way that eight pins and multiple switch, multiple resistance welding bit combinations for being used for welding kesistance are used, select the on-off of each beginning, and selection resistance welding position whether welding kesistance, it can be used for transistor measurement function or start control function for key, it is versatile for the digital multimeter with different function type, it can be effectively reduced manufacturing cost.
Description
Technical field
The present invention relates to electrician tool field more particularly to a kind of multiplexing functions circuit boards and number for digital multimeter
Word multimeter.
Background technique
Digital multimeter is a kind of multi-functional, multiple range measuring instrumentss, general digital multimeter can measure DC current,
DC voltage, alternating current, alternating voltage, resistance and audio-frequency electric equality, some can also to survey alternating current, capacitance, inductance
Some parameters (such as β) of amount and semiconductor.
When client's required function is more, it is limited to cost control, is generally solved by the way of multiplexing functions.It is i.e. same
Single port has multiple functions, exports different functions when configuring different parameters.Even it is able to solve some problems in this way, but
In order to reduce die cost, encounters need to arrange the component of different function in same position sometimes, for example, same shape
The same position of the circuit board of two digital multimeter, wherein a switch control for needing to be used as LED light, another money need to use
Transistor measurement is done, if not using unified encapsulation, but respectively using the original package of default, it would be desirable to two kinds of boards
Different components could be welded on same position, in this way if component cost high will look forward to when usage amount is little, nothing
Method realizes the needs for reducing cost.
Summary of the invention
The main purpose of the present invention is to provide a kind of multiplexing functions circuit boards and digital versatile for digital multimeter
Table, it is intended to realize the multiplexing of function, by same circuit board to reduce generation product.
To achieve the above object, the present invention provides a kind of multiplexing functions circuit board for digital multimeter, described to be used for
The multiplexing functions circuit board of digital multimeter is equipped with transistor interface device, first switch, second switch, third switch, the
Four switches, the 5th switch, the 6th switch, the 7th switch, the first resistor welding position for welding first resistor, for welding the
The second resistance welding position of two resistance, the 3rd resistor welding position for welding 3rd resistor and for welding the 4th resistance
Four resistance welding positions；The transistor interface device is made of a NPN transistor and a PNP transistor and has eight
A pin, eight pins include the first pin connecting with the emitter of NPN transistor and the 4th pin and NPN type
The second pin of the base stage connection of transistor connect with the collector of NPN transistor third pin and PNP transistor
The 5th pin and the 8th pin of emitter connection, the 6th pin and and positive-negative-positive being connect with the collector of PNP transistor
The base stage of transistor connects the 7th pin；
First pin is connect with the side of the side of the first resistor welding position and the second resistance welding position,
The other side of the first resistor welding position with the Analog-digital Converter port of the main control chip of digital multimeter for connecting, institute
State the other side ground connection of second resistance welding position；
The first switch is connected between first pin and the side of the 3rd resistor welding position, the third
The other side of resistance welding position with the power supply of digital multimeter for connecting；
The second switch is connected between the second pin and the side of the 3rd resistor welding position；
The third switch is connected between the third pin and the side of the 4th resistance welding position, and the described 4th
The other side of resistance welding position is grounded；
4th pin is connect with first pin；
4th switch is connected between the 5th pin and the side of the 4th resistance welding position；
One end of 5th switch is connect with the 6th pin, and the other end of the 5th switch and the 3rd resistor are welded
Connect the side connection of position；
6th switch is connected to the side of the 7th pin and the 4th resistance welding position；
One end of 7th switch is connect with the side of the other end of the 5th switch and 3rd resistor welding position, institute
The other end of the 7th switch is stated for connecting with the key switch control function pin of digital multimeter；
8th pin connect with the 5th pin and is used to connect with the power supply of digital multimeter.
Preferably, the first resistor welding position, second resistance welding position, 3rd resistor welding position and the 4th resistance welding
Position is respectively welded first resistor, second resistance, 3rd resistor and the 4th resistance, one end of the first resistor and described first
Pin connection, the Analog-digital Converter port connection of the main control chip of the other end and digital multimeter of the first resistor, institute
It states first switch, third switch, the 4th switch and the 6th switch to be both turned on, the second switch, the 5th switch and the 7th switch
It disconnects, makes the multiplexing functions circuit board for transistor measurement function.
Preferably, the first resistor welding position, second resistance welding position, 3rd resistor welding position and the 4th resistance welding
The unwelded resistance in position, the first switch, third switch, the 4th switch and the 6th switch disconnect, the second switch, the
Five switches and the 7th switch are both turned on, and the multiplexing functions circuit board is made to start control function for key.
Preferably, eight pins of the transistor interface device are patch type and are arranged into two rows four column, wherein a line
It is arranged in order by the first pin, second pin, third pin and the 4th pin, wherein another row is drawn by the 5th pin, the 6th
Foot, the 7th pin and the 8th pin are arranged in order, and first pin is opposite with the 8th pin, the 4th pin
It is opposite with the 5th pin.
Preferably, the inner end of first pin, third pin and the 4th pin is concordant with outer end, the second pin
Outer end it is concordant with the outer end of the first pin, third pin and the 4th pin, the inner end of the second pin is drawn relative to second
Foot inner end has more the first length L1, and the inner end side of the second pin extends vertically the second length L2's towards third pin
First extension；The inner end of 5th pin, the 7th pin and the 8th pin is concordant with outer end, outside the 6th pin
End is concordant with the outer end of the 5th pin, the 7th pin and the 8th pin, and the inner end of the 6th pin is relative in the 5th pin
End has more third length L3, and the inner end side of the 6th pin extends vertically the second of the 4th length L4 towards the 7th pin and prolongs
Extending portion.
Preferably, the distance between two neighboring pin is all the same in every row in the transistor interface device and is
One width d1, eight pins of the transistor interface device of same size and be the second width d2, described first extends
The distance between portion and the second extension are third width d3, and the distance of inner end of first extension to third pin is the
Four width d4, the distance of second extension to the inner end of the 7th pin are the 5th width d5, wherein d1≤d3≤D,
D4 >=d1, d5 >=d1, D are the diameter of multiplexing functions key conductive film.
Preferably, the first length L1 is equal with the 4th length L4, and equal with the first width d1, the 4th width d4
It is equal with the 5th width d5, wherein d1=1.52mm, d2=1.02mm, D >=3mm.
Preferably, the inner end of first pin, second pin, third pin and the 4th pin is concordant with outer end；Institute
The inner end for stating the 5th pin, the 6th pin, the 7th pin and the 8th pin is concordant with outer end, in the transistor interface device
The distance between two neighboring pin is all the same in every row and is the 6th width d6, and eight of the transistor interface device draw
Foot of same size and be the 7th width d7, first pin, second pin, third pin and the 4th pin inner end with
The distance between inner end of 5th pin, the 6th pin, the 7th pin and the 8th pin is the 8th width d8, wherein d6
≤ d8≤D, D are the diameter of multiplexing functions key conductive film.
Preferably, the 6th width d6=1.52mm, D >=3mm.
Preferably, eight pins of the transistor interface device are direct insertion and are arranged into two rows four column, wherein a line
It is arranged in order by the first pin, second pin, third pin and the 4th pin, wherein another row is drawn by the 5th pin, the 6th
Foot, the 7th pin and the 8th pin are arranged in order, and first pin is adjacent with the 8th pin, the 4th pin
Adjacent with the 5th pin, the spacing between two neighboring pin is less than D, and D is the diameter of multiplexing functions key conductive film.
To achieve the above object, the present invention also provides a kind of digital multimeter, the digital multimeter includes use above-mentioned
In the multiplexing functions circuit board of digital multimeter.
Multiplexing functions circuit board and digital multimeter for digital multimeter of the invention, it is described to be used for digital multimeter
Multiplexing functions circuit board can be used for transistor measurement function or for key start control function, transistor measure function
It can be used for testing the amplification factor of measurement transistor, key beginning control function can be used in the functions such as backlight/holding/range
One or more on-off management, the digital multimeter that same circuit board can be used for having different function type is versatile,
It can be effectively reduced manufacturing cost.
Detailed description of the invention
Fig. 1 is electrical block diagram of the present invention for one embodiment of multiplexing functions circuit board of digital multimeter.
Fig. 2 is shown in Fig. 1 for transistor interface device first embodiment in the multiplexing functions circuit board of digital multimeter
Structural schematic diagram.
Fig. 3 is shown in Fig. 1 for transistor interface device second embodiment in the multiplexing functions circuit board of digital multimeter
Structural schematic diagram.
Fig. 4 is shown in Fig. 1 for transistor interface device 3rd embodiment in the multiplexing functions circuit board of digital multimeter
Structural schematic diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are only used to explain the present invention, it is not used to limit this hair
It is bright.
An embodiment for the present invention for the multiplexing functions circuit board of digital multimeter as shown in Figure 1.In the present embodiment
In, the multiplexing functions circuit board for digital multimeter is opened equipped with transistor interface device Q, first switch J1, second
Close J2, third switch J3, the 4th switch J4, the 5th switch J5, the 6th switch J6, the 7th switch J7, for welding first resistor
The first resistor welding position of R1, the second resistance welding position for welding second resistance R2, for welding 3rd resistor R3
Three resistance welding positions and the 4th resistance welding position for welding the 4th resistance R4.
The transistor interface device Q is made of a NPN transistor and a PNP transistor and there are eight to be drawn
Foot, eight pins include that the first pin 1 connecting with the emitter E of NPN transistor and the 4th pin 4 and NPN type are brilliant
The second pin 2 of the base stage B connection of body pipe connect third pin 3 and PNP transistor with the collector C of NPN transistor
Emitter E ' connection the 5th pin 5 and the 8th pin 8, connect with the collector C' of PNP transistor the 6th pin 6,
And the 7th pin 7 is connect with the base stage B' of PNP transistor.
First pin 1 and the side 11 of the first resistor welding position and the side 21 of the second resistance welding position
Connection, the other side 12 of the first resistor welding position is for the Analog-digital Converter port with the main control chip of digital multimeter
The other side 22 of AD connection, the second resistance welding position is grounded.
The first switch J1 is connected between first pin 1 and the side 31 of the 3rd resistor welding position, institute
The other side 32 of 3rd resistor welding position is stated for connecting with the power supply VCC of digital multimeter；
The second switch J2 is connected between the second pin 2 and the side 31 of the 3rd resistor welding position；
The third switch J3 is connected between the third pin 3 and the side 41 of the 4th resistance welding position, institute
The other side 42 for stating the 4th resistance welding position is grounded；
4th pin 4 is connect with first pin 1；
The 4th switch J4 is connected between the 5th pin 5 and the side 41 of the 4th resistance welding position；
One end of the 5th switch J5 is connect with the 6th pin 6, the other end of the 5th switch J5 and the third
The side 31 of resistance welding position connects；
The 6th switch J6 is connected to the side 41 of the 7th pin 7 and the 4th resistance welding position；
One end and the other end of the 5th switch J5 and the side 31 of 3rd resistor welding position of the 7th switch J7
Connection, the other end of the 7th switch J7 with the key switch control function pin KEY of digital multimeter for connecting；
8th pin 8 connect with the 5th pin 5 and for connecting with the power supply VCC of digital multimeter.
The multiplexing functions circuit board for digital multimeter can be used for transistor measurement function or for key
Start control function, but the two function does not provide simultaneously.Transistor measurement function can be used for testing the amplification of measurement transistor
Multiple, key beginning control function can be used for on-off management one or more in the functions such as backlight/holding/range.
When measuring function for transistor, the first resistor welding position, second resistance welding position, 3rd resistor welding position
And the 4th resistance welding position be respectively welded first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4, described
One end of one resistance R1 is connect with first pin 1, the other end of the first resistor R1 and the master control core of digital multimeter
The Analog-digital Converter port AD connection of piece, the first switch J1, third switch J3, the 4th switch J4 and the 6th switch J6 are equal
Conducting, the second switch J2, the 5th switch J5 and the 7th switch J7 are disconnected, and make the multiplexing functions circuit board for crystal
Pipe measures function.
When starting control function for key, then the first resistor welding position, second resistance welding position, 3rd resistor weldering
The unwelded resistance in position and the 4th resistance welding position is connect, the first switch J1, third switch J3, the 4th switch J4 and the 6th are opened
It closes J6 to disconnect, the second switch J2, the 5th switch J5 and the 7th switch J7 are both turned on, and use the multiplexing functions circuit board
Start control function in key.
As shown in Fig. 2, for shown in Fig. 1 for transistor interface device Q in the multiplexing functions circuit board of digital multimeter the
The structural schematic diagram of one embodiment, in the present embodiment, eight pins of the transistor interface device Q are patch type and arrangement
It is arranged at two rows four, wherein a line is arranged in order by the first pin 1, second pin 2, third pin 3 and the 4th pin 4, wherein
Another row is arranged in order by the 5th pin 5, the 6th pin 6, the 7th pin 7 and the 8th pin 8, and first pin 1 with
8th pin 8 is opposite, and the 4th pin 4 is opposite with the 5th pin 5.
The inner end of first pin 1, third pin 3 and the 4th pin 4 is concordant with outer end, the second pin 2
Outer end is concordant with the outer end of the first pin 1, third pin 3 and the 4th pin 4, and the inner end of the second pin 2 is relative to second
2 inner end of pin has more the first length L1, and the inner end side of the second pin 2 has extended vertically the second length towards third pin 3
Spend the first extension of L2；The inner end of 5th pin 5, the 7th pin 7 and the 8th pin 8 is concordant with outer end, and described
The outer end of six pins 6 is concordant with the outer end of the 5th pin 5, the 7th pin 7 and the 8th pin 8, the inner end phase of the 6th pin 6
Third length L3 is had more for 5 inner end of the 5th pin, the inner end side of the 6th pin 6 is extended vertically towards the 7th pin 7
The second extension of 4th length L4.
In order to keep the original electrical safety characteristic of product and application attribute as far as possible, need not changing original device as far as possible
Part electric clearance, insulation thickness.Therefore, the encapsulation of transistor interface device Q needs to consider the electric clearance of original device, insulation
Thickness.In the present embodiment, the distance between two neighboring pin is all the same and equal in every row in the transistor interface device Q
For the first width d1, eight pins of the transistor interface device Q of same size and be the second width d2, described first
The distance between extension and the second extension be third width d3, first extension to the inner end of third pin 3 away from
It is the 5th width d5 from the distance for the 4th width d4, second extension to the inner end of the 7th pin 7, wherein d1
≤ d3≤D, d4 >=d1, d5 >=d1, D are the diameter of multiplexing functions key conductive film, usual D >=3mm.Due to d3≤D, so that function
Can multiplexing can be connected by when key pressing, due to d3 >=d1, will not influence the insulation characterisitic of crystal pipe insert seat in this way, due to d4 >=
D1 does not influence the insulation characterisitic of crystal pipe insert seat in this way.
Using the present embodiment transistor interface device Q when, the center O of multiplexing functions key conductive film and integrated envelope
The silk-screen center of dress is consistent.
In a concrete application example, the first length L1 is equal with the 4th length L4, and equal with the first width d1,
4th width d4 and the 5th width d5 are equal, wherein d1=1.52mm, d2=1.02mm, D=3mm.
As shown in figure 3, for shown in Fig. 1 for transistor interface device Q in the multiplexing functions circuit board of digital multimeter the
The structural schematic diagram of two embodiments, in the present embodiment, eight pins of the transistor interface device Q are patch type and arrangement
It is arranged at two rows four, wherein a line is arranged in order by the first pin 1, second pin 2, third pin 3 and the 4th pin 4, wherein
Another row is arranged in order by the 5th pin 5, the 6th pin 6, the 7th pin 7 and the 8th pin 8, and first pin 1 with
8th pin 8 is opposite, and the 4th pin 4 is opposite with the 5th pin 5.
In the present embodiment, the inner end and outer end of first pin 1, second pin 2, third pin 3 and the 4th pin 4
It is concordant；5th pin 5, the 6th pin 6, the inner end of the 7th pin 7 and the 8th pin 8 are concordant with outer end, the crystalline substance
The distance between two neighboring pin is all the same in every row in body interface tube device Q and is the 6th width d6, the transistor
Eight pins of interface device Q of same size and be the 7th width d7, first pin 1, second pin 2, third are drawn
The inner end and the 5th pin 5 of foot 3 and the 4th pin 4, the 6th pin 6, the 7th pin 7 and the 8th pin 8 inner end between
Distance be the 8th width d8, wherein d6≤d8≤D, D be multiplexing functions key conductive film diameter.Due to d8 >=d6, in this way
It will not influence the insulation characterisitic of crystal pipe insert seat.In a concrete application example, the 6th width d6=1.52mm, D=3mm.
As shown in figure 4, for shown in Fig. 1 for transistor interface device Q in the multiplexing functions circuit board of digital multimeter the
The structural schematic diagram of three embodiments, in the present embodiment, eight pins of the transistor interface device Q are direct insertion and arrange
It is arranged at two rows four, wherein a line is arranged in order by the first pin 1, second pin 2, third pin 3 and the 4th pin 4, wherein
Another row is arranged in order by the 5th pin 5, the 6th pin 6, the 7th pin 7 and the 8th pin 8, and first pin 1 with
8th pin 8 is adjacent, and the 4th pin 4 is adjacent with the 5th pin 5, and the spacing between two neighboring pin is less than
D, D are the diameter of multiplexing functions key conductive film.
The embodiment of the present invention also provides a kind of digital multimeter, and the digital multimeter includes being previously described for number ten thousand
With the multiplexing functions circuit board of table.
The invention is not limited to embodiment of above, can also be under technology contents disclosed in above embodiment
Row various change.It is all to utilize equivalent structure transformation made by description of the invention and accompanying drawing content, directly or indirectly use
In other related technical areas, it is included within the scope of the present invention.
Claims (11)
1. a kind of multiplexing functions circuit board for digital multimeter, which is characterized in that the function for digital multimeter
Multiplex circuit plate is switched equipped with transistor interface device, first switch, second switch, third switch, the 4th, the 5th switchs,
6th switch, the 7th switch, the first resistor welding position for welding first resistor, the second resistance for welding second resistance
Welding position, the 3rd resistor welding position for welding 3rd resistor and the 4th resistance welding position for welding the 4th resistance；Institute
It states transistor interface device and is made of and has eight pins a NPN transistor and a PNP transistor, described eight
Pin includes the first pin connecting with the emitter of NPN transistor and the 4th pin, connect with the base stage of NPN transistor
Second pin, with the collector of NPN transistor connect third pin, connect with the emitter of PNP transistor the 5th
It pin and the 8th pin, the 6th pin being connect with the collector of PNP transistor and is connect with the base stage of PNP transistor
7th pin；
First pin is connect with the side of the side of the first resistor welding position and the second resistance welding position, described
The other side of first resistor welding position with the Analog-digital Converter port of the main control chip of digital multimeter for connecting, and described the
The other side of two resistance welding positions is grounded；
The first switch is connected between first pin and the side of the 3rd resistor welding position, the 3rd resistor
The other side of welding position with the power supply of digital multimeter for connecting；
The second switch is connected between the second pin and the side of the 3rd resistor welding position；
The third switch is connected between the third pin and the side of the 4th resistance welding position, the 4th resistance
The other side of welding position is grounded；
4th pin is connect with first pin；
4th switch is connected between the 5th pin and the side of the 4th resistance welding position；
One end of 5th switch is connect with the 6th pin, the other end of the 5th switch and the 3rd resistor welding position
Side connection；
6th switch is connected to the side of the 7th pin and the 4th resistance welding position；
The other end and the side of 3rd resistor welding position that one end of 7th switch is switched with the described 5th are connect, and described the
The other end of seven switches with the key switch control function pin of digital multimeter for connecting；
8th pin connect with the 5th pin and is used to connect with the power supply of digital multimeter.
2. being used for the multiplexing functions circuit board of digital multimeter as described in claim 1, which is characterized in that the first resistor
Welding position, second resistance welding position, 3rd resistor welding position and the 4th resistance welding position are respectively welded first resistor, the second electricity
Resistance, 3rd resistor and the 4th resistance, one end of the first resistor are connect with first pin, the first resistor it is another
End is connect with the Analog-digital Converter port of the main control chip of digital multimeter, the first switch, third switch, the 4th switch
And the 6th switch be both turned on, the second switch, the 5th switch and the 7th switch disconnect, and use the multiplexing functions circuit board
Function is measured in transistor.
3. being used for the multiplexing functions circuit board of digital multimeter as described in claim 1, which is characterized in that the first resistor
Welding position, second resistance welding position, the unwelded resistance of 3rd resistor welding position and the 4th resistance welding position, described first opens
Pass, third switch, the 4th switch and the 6th switch disconnect, and the second switch, the 5th switch and the 7th, which switch, to be both turned on, and make
The multiplexing functions circuit board starts control function for key.
4. being used for the multiplexing functions circuit board of digital multimeter as described in claim 1, which is characterized in that the transistor
Eight pins of mouthpart part are patch type and are arranged into two rows four column, and wherein a line is by the first pin, second pin, third pin
And the 4th pin be arranged in order, wherein another row is arranged in order by the 5th pin, the 6th pin, the 7th pin and the 8th pin
Column, and first pin is opposite with the 8th pin, the 4th pin is opposite with the 5th pin.
5. being used for the multiplexing functions circuit board of digital multimeter as claimed in claim 4, which is characterized in that described first draws
The inner end of foot, third pin and the 4th pin is concordant with outer end, the outer end of the second pin and the first pin, third pin
And the 4th pin outer end it is concordant, the inner end of the second pin has more the first length L1 relative to second pin inner end, described
The inner end side of second pin extends vertically the first extension of the second length L2 towards third pin；5th pin,
The inner end of 7th pin and the 8th pin is concordant with outer end, the outer end of the 6th pin and the 5th pin, the 7th pin and
The outer end of 8th pin is concordant, and the inner end of the 6th pin has more third length L3 relative to the 5th pin inner end, and described
The inner end side of six pins extends vertically the second extension of the 4th length L4 towards the 7th pin.
6. being used for the multiplexing functions circuit board of digital multimeter as claimed in claim 5, which is characterized in that the transistor
The distance between two neighboring pin is all the same in every row in mouthpart part and is the first width d1, the transistor interface device
Eight pins of same size and be the second width d2, the distance between first extension and the second extension are the
Three width d3, the distance of inner end of first extension to third pin are the 4th width d4, second extension to institute
The distance for stating the inner end of the 7th pin is the 5th width d5, wherein d1≤d3≤D, d4 >=d1, d5 >=d1, D press for multiplexing functions
The diameter of key conductive film.
7. being used for the multiplexing functions circuit board of digital multimeter as claimed in claim 6, which is characterized in that first length
L1 is equal with the 4th length L4, and equal with the first width d1, and the 4th width d4 and the 5th width d5 are equal, wherein d1=
1.52mm, d2=1.02mm, D >=3mm.
8. being used for the multiplexing functions circuit board of digital multimeter as claimed in claim 4, which is characterized in that described first draws
Foot, second pin, the inner end of third pin and the 4th pin are concordant with outer end；5th pin, the 6th pin, the 7th draw
The inner end of foot and the 8th pin is concordant with outer end, in the transistor interface device in every row between two neighboring pin away from
From all the same and be the 6th width d6, eight pins of the transistor interface device of same size and be the 7th width
D7, first pin, second pin, the inner end of third pin and the 4th pin and the 5th pin, the 6th pin, the 7th
The distance between inner end of pin and the 8th pin is the 8th width d8, wherein d6≤d8≤D, D are that multiplexing functions key is conductive
The diameter of film.
9. being used for the multiplexing functions circuit board of digital multimeter as claimed in claim 8, which is characterized in that the 6th width
D6=1.52mm, D >=3mm.
10. being used for the multiplexing functions circuit board of digital multimeter as described in claim 1, which is characterized in that the transistor
Eight pins of interface device are direct insertion and are arranged into two rows four column, and wherein a line is drawn by the first pin, second pin, third
Foot and the 4th pin are arranged in order, wherein another row by the 5th pin, the 6th pin, the 7th pin and the 8th pin in order
Arrangement, and first pin is adjacent with the 8th pin, the 4th pin is adjacent with the 5th pin, two neighboring
Spacing between pin is less than D, and D is the diameter of multiplexing functions key conductive film.
11. a kind of digital multimeter, which is characterized in that the digital multimeter includes as any one in claims 1 to 10 item
The multiplexing functions circuit board for digital multimeter described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811259802.9A CN109061266A (en) | 2018-10-26 | 2018-10-26 | Multiplexing functions circuit board and digital multimeter for digital multimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811259802.9A CN109061266A (en) | 2018-10-26 | 2018-10-26 | Multiplexing functions circuit board and digital multimeter for digital multimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109061266A true CN109061266A (en) | 2018-12-21 |
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| CN201811259802.9A Pending CN109061266A (en) | 2018-10-26 | 2018-10-26 | Multiplexing functions circuit board and digital multimeter for digital multimeter |
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Citations (6)
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|---|---|---|---|---|
| CN2060897U (en) * | 1989-08-26 | 1990-08-22 | 山东省纺织工业电脑技术咨询服务中心 | Intelligent on-line multi-test electric meter |
| US6975103B1 (en) * | 2004-06-25 | 2005-12-13 | National Semiconductor Corporation | Resistance ratio digitizing ohmmeter system |
| CN101668057A (en) * | 2009-09-09 | 2010-03-10 | 深圳华为通信技术有限公司 | Terminal and system with function of multimeter |
| CN202994875U (en) * | 2012-12-07 | 2013-06-12 | 陕西千山航空电子有限责任公司 | A multi-channel calibrating device |
| US20150028892A1 (en) * | 2012-04-12 | 2015-01-29 | Cyrustek Corporation | Digital multi-meter with lcr function |
| CN209102790U (en) * | 2018-10-26 | 2019-07-12 | 桂林市华谊智测科技有限责任公司 | Multiplexing functions circuit board and digital multimeter for digital multimeter |
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2018
- 2018-10-26 CN CN201811259802.9A patent/CN109061266A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2060897U (en) * | 1989-08-26 | 1990-08-22 | 山东省纺织工业电脑技术咨询服务中心 | Intelligent on-line multi-test electric meter |
| US6975103B1 (en) * | 2004-06-25 | 2005-12-13 | National Semiconductor Corporation | Resistance ratio digitizing ohmmeter system |
| CN101668057A (en) * | 2009-09-09 | 2010-03-10 | 深圳华为通信技术有限公司 | Terminal and system with function of multimeter |
| US20150028892A1 (en) * | 2012-04-12 | 2015-01-29 | Cyrustek Corporation | Digital multi-meter with lcr function |
| CN202994875U (en) * | 2012-12-07 | 2013-06-12 | 陕西千山航空电子有限责任公司 | A multi-channel calibrating device |
| CN209102790U (en) * | 2018-10-26 | 2019-07-12 | 桂林市华谊智测科技有限责任公司 | Multiplexing functions circuit board and digital multimeter for digital multimeter |
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