CN109061266B - Function multiplexing circuit board for digital multimeter and digital multimeter - Google Patents
Function multiplexing circuit board for digital multimeter and digital multimeter Download PDFInfo
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- CN109061266B CN109061266B CN201811259802.9A CN201811259802A CN109061266B CN 109061266 B CN109061266 B CN 109061266B CN 201811259802 A CN201811259802 A CN 201811259802A CN 109061266 B CN109061266 B CN 109061266B
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- 238000003466 welding Methods 0.000 claims abstract description 92
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
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- 230000037431 insertion Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
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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
The invention discloses a functional multiplexing circuit board for a digital multimeter and the digital multimeter. The function multiplexing circuit board for the digital multimeter is provided with a transistor interface device, a plurality of switches and a plurality of resistance welding positions for welding resistors; the transistor interface device consists of an NPN transistor and a PNP transistor and is provided with eight pins, and the eight pins are combined with a plurality of switches and a plurality of resistance welding bits for welding resistors to select the on-off of each head and select whether the resistance welding bits are welded with the resistors or not, so that the transistor interface device can be used for a transistor measuring function or a key head control function, is used for digital universal meters with different function types, has strong universality and can effectively reduce the production and manufacturing cost.
Description
Technical Field
The invention relates to the field of electrical tools, in particular to a functional multiplexing circuit board for a digital multimeter and the digital multimeter.
Background
The digital multimeter is a multifunctional and multi-range measuring instrument, and can measure DC current, DC voltage, AC current, AC voltage, resistance, audio level, etc. and may also measure AC current, capacitance, inductance, some parameters of semiconductor, etc.
When more functions are needed by customers, the functions are limited by cost control and are generally solved by adopting a function multiplexing mode. That is, the same port has multiple functions, and different functions are output when different parameters are configured. Even if such problems can be solved, in order to reduce the cost of the die, components with different functions are sometimes arranged at the same position, for example, the same position of a circuit board of two digital multimeters with the same appearance is sometimes encountered, one of the two digital multimeters needs to be used for controlling the switch of an LED lamp, and the other digital multimeter needs to be used for measuring a transistor.
Disclosure of Invention
The invention mainly aims to provide a functional multiplexing circuit board for a digital multimeter and the digital multimeter, which aim to realize multiplexing of functions through the same circuit board so as to reduce the generation of products.
In order to achieve the above object, the present invention provides a function multiplexing circuit board for a digital multimeter, on which a transistor interface device, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first resistance welding bit for welding a first resistor, a second resistance welding bit for welding a second resistor, a third resistance welding bit for welding a third resistor, and a fourth resistance welding bit for welding a fourth resistor are disposed; the transistor interface device consists of an NPN transistor and a PNP transistor and is provided with eight pins, wherein the eight pins comprise a first pin and a fourth pin which are connected with an emitter of the NPN transistor, a second pin which is connected with a base of the NPN transistor, a third pin which is connected with a collector of the NPN transistor, a fifth pin and an eighth pin which are connected with the emitter of the PNP transistor, a sixth pin which is connected with the collector of the PNP transistor and a seventh pin which is connected with a base of the PNP transistor;
The first pin is connected with one side of the first resistance welding position and one side of the second resistance welding position, the other side of the first resistance welding position is used for being connected with an analog-digital conversion port of a main control chip of the digital multimeter, and the other side of the second resistance welding position is grounded;
the first switch is connected between the first pin and one side of the third resistance welding position, and the other side of the third resistance welding position is used for being connected with a power supply of the digital multimeter;
the second switch is connected between the second pin and one side of the third resistance welding position;
the third switch is connected between the third pin and one side of the fourth resistance welding position, and the other side of the fourth resistance welding position is grounded;
The fourth pin is connected with the first pin;
The fourth switch is connected between the fifth pin and one side of the fourth resistance welding position;
One end of the fifth switch is connected with the sixth pin, and the other end of the fifth switch is connected with one side of the third resistance welding position;
the sixth switch is connected to one side of the seventh pin and one side of the fourth resistance welding position;
One end of the seventh switch is connected with the other end of the fifth switch and one side of the third resistance welding position, and the other end of the seventh switch is used for being connected with a key switch control function pin of the digital multimeter;
the eighth pin is connected with the fifth pin and is used for being connected with a power supply of the digital multimeter.
Preferably, the first resistance welding position, the second resistance welding position, the third resistance welding position and the fourth resistance welding position are respectively welded with a first resistor, a second resistor, a third resistor and a fourth resistor, one end of the first resistor is connected with the first pin, the other end of the first resistor is connected with an analog-digital conversion port of a main control chip of the digital multimeter, the first switch, the third switch, the fourth switch and the sixth switch are all turned on, and the second switch, the fifth switch and the seventh switch are all turned off, so that the function multiplexing circuit board is used for a transistor measurement function.
Preferably, the first resistance welding position, the second resistance welding position, the third resistance welding position and the fourth resistance welding position are all not welded with resistance, the first switch, the third switch, the fourth switch and the sixth switch are all disconnected, and the second switch, the fifth switch and the seventh switch are all connected, so that the function multiplexing circuit board is used for key start control function.
Preferably, the eight pins of the transistor interface device are arranged in two rows and four columns in a patch mode, wherein one row is sequentially arranged by a first pin, a second pin, a third pin and a fourth pin, the other row is sequentially arranged by a fifth pin, a sixth pin, a seventh pin and an eighth pin, the first pin is opposite to the eighth pin, and the fourth pin is opposite to the fifth pin.
Preferably, the inner ends and the outer ends of the first pin, the third pin and the fourth pin are all flush, the outer end of the second pin is flush with the outer ends of the first pin, the third pin and the fourth pin, the inner end of the second pin is more than the inner end of the second pin by a first length L1, and a first extension part with a second length L2 vertically extends towards the third pin from one side of the inner end of the second pin; the inner ends and the outer ends of the fifth pin, the seventh pin and the eighth pin are all flush, the outer end of the sixth pin is flush with the outer ends of the fifth pin, the seventh pin and the eighth pin, the inner end of the sixth pin is more than the inner end of the fifth pin by a third length L3, and one side of the inner end of the sixth pin vertically extends towards the second extension part of the seventh pin by a fourth length L4.
Preferably, the distances between two adjacent pins in each row in the transistor interface device are the same and are both the first width D1, the widths of eight pins in the transistor interface device are the same and are both the second width D2, the distance between the first extension part and the second extension part is the third width D3, the distance from the first extension part to the inner end of the third pin is the fourth width D4, the distance from the second extension part to the inner end of the seventh pin is the fifth width D5, wherein D1 is less than or equal to D3 is less than or equal to D1, D4 is less than or equal to D1, D5 is less than or equal to D1, and D is the diameter of the functional multiplexing key conductive film.
Preferably, the first length L1 is equal to the fourth length L4 and equal to the first width d1, the fourth width d4 and the fifth width d5 are equal, wherein d1=1.52 mm, d2=1.02 mm, and d is equal to or greater than 3mm.
Preferably, the inner ends and the outer ends of the first pin, the second pin, the third pin and the fourth pin are all flush; the inner ends and the outer ends of the fifth pin, the sixth pin, the seventh pin and the eighth pin are all flush, the distances between two adjacent pins in each row in the transistor interface device are the same and are all the sixth width D6, the widths of eight pins of the transistor interface device are the same and are all the seventh width D7, and the distances between the inner ends of the first pin, the second pin, the third pin and the fourth pin and the inner ends of the fifth pin, the sixth pin, the seventh pin and the eighth pin are the eighth width D8, wherein D6 is less than or equal to D8, and D is the diameter of the functional multiplexing key conductive film.
Preferably, the sixth width d6=1.52 mm, d is not less than 3mm.
Preferably, eight pins of the transistor interface device are in direct insertion and are arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin, a second pin, a third pin and a fourth pin, the other row is sequentially arranged by a fifth pin, a sixth pin, a seventh pin and an eighth pin, the first pin is adjacent to the eighth pin, the fourth pin is adjacent to the fifth pin, the interval between the two adjacent pins is smaller than D, and D is the diameter of the functional multiplexing key conductive film.
In order to achieve the above object, the present invention further provides a digital multimeter comprising the aforementioned functional multiplexing circuit board for a digital multimeter.
The function multiplexing circuit board for the digital multimeter can be used for a transistor measuring function or a key-start control function, the transistor measuring function can be used for testing and measuring the amplification factor of a transistor, the key-start control function can be used for on-off management of one or more of functions such as backlight/holding/measuring range and the like, the same circuit board can be used for the digital multimeter with different function types, the universality is strong, and the production and manufacturing cost can be effectively reduced.
Drawings
FIG. 1 is a schematic circuit diagram of a functional multiplexing circuit board for a digital multimeter according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a first embodiment of a transistor interface device in the functional multiplexing circuit board for a digital multimeter shown in FIG. 1.
FIG. 3 is a schematic diagram of a second embodiment of a transistor interface device in the functional multiplexing circuit board for a digital multimeter shown in FIG. 1.
FIG. 4 is a schematic diagram of a third embodiment of a transistor interface device in the functional multiplexing circuit board for a digital multimeter shown in FIG. 1.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
FIG. 1 shows an embodiment of a functional multiplexing circuit board for a digital multimeter of the present invention. In this embodiment, the functional multiplexing circuit board for a digital multimeter is provided with a transistor interface device Q, a first switch J1, a second switch J2, a third switch J3, a fourth switch J4, a fifth switch J5, a sixth switch J6, a seventh switch J7, a first resistance welding bit for welding the first resistor R1, a second resistance welding bit for welding the second resistor R2, a third resistance welding bit for welding the third resistor R3, and a fourth resistance welding bit for welding the fourth resistor R4.
The transistor interface device Q is composed of one NPN-type transistor and one PNP-type transistor and has eight pins including a first pin 1 and a fourth pin 4 connected to an emitter E of the NPN-type transistor, a second pin 2 connected to a base B of the NPN-type transistor, a third pin 3 connected to a collector C of the NPN-type transistor, a fifth pin 5 and an eighth pin 8 connected to an emitter E ' of the PNP-type transistor, a sixth pin 6 connected to a collector C ' of the PNP-type transistor, and a seventh pin 7 connected to a base B ' of the PNP-type transistor.
The first pin 1 is connected with one side 11 of the first resistance welding position and one side 21 of the second resistance welding position, the other side 12 of the first resistance welding position is used for being connected with an analog-digital conversion port AD of a main control chip of the digital multimeter, and the other side 22 of the second resistance welding position is grounded.
The first switch J1 is connected between the first pin 1 and one side 31 of the third resistance welding position, and the other side 32 of the third resistance welding position is used for being connected with a power supply VCC of a digital multimeter;
the second switch J2 is connected between the second pin 2 and one side 31 of the third resistance welding position;
The third switch J3 is connected between the third pin 3 and one side 41 of the fourth resistance welding position, and the other side 42 of the fourth resistance welding position is grounded;
The fourth pin 4 is connected with the first pin 1;
The fourth switch J4 is connected between the fifth pin 5 and one side 41 of the fourth resistance welding position;
One end of the fifth switch J5 is connected with the sixth pin 6, and the other end of the fifth switch J5 is connected with one side 31 of the third resistance welding position;
The sixth switch J6 is connected to the seventh pin 7 and one side 41 of the fourth resistance welding position;
One end of the seventh switch J7 is connected with the other end of the fifth switch J5 and one side 31 of the third resistance welding position, and the other end of the seventh switch J7 is used for being connected with a KEY switch control function pin KEY of the digital multimeter;
The eighth pin 8 is connected with the fifth pin 5 and is used for being connected with a power supply VCC of the digital multimeter.
The function multiplexing circuit board for the digital multimeter can be used for a transistor measurement function or a key start control function, but the functions are not provided at the same time. The transistor measuring function can be used for testing the amplification factor of the measuring transistor, and the key start control function can be used for on-off management of one or more of backlight/holding/measuring range and other functions.
When the circuit is used for a transistor measurement function, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 are welded on the first resistor welding position, the second resistor welding position, the third resistor welding position and the fourth resistor welding position respectively, one end of the first resistor R1 is connected with the first pin 1, the other end of the first resistor R1 is connected with an analog-digital conversion port AD of a main control chip of a digital multimeter, the first switch J1, the third switch J3, the fourth switch J4 and the sixth switch J6 are all conducted, and the second switch J2, the fifth switch J5 and the seventh switch J7 are all disconnected, so that the function multiplexing circuit board is used for the transistor measurement function.
When the function multiplexing circuit board is used for the key start control function, the first resistance welding position, the second resistance welding position, the third resistance welding position and the fourth resistance welding position are not welded with resistance, the first switch J1, the third switch J3, the fourth switch J4 and the sixth switch J6 are all disconnected, and the second switch J2, the fifth switch J5 and the seventh switch J7 are all connected, so that the function multiplexing circuit board is used for the key start control function.
As shown in fig. 2, a schematic structural diagram of a first embodiment of a transistor interface device Q in the functional multiplexing circuit board for a digital multimeter shown in fig. 1 is shown, in this embodiment, eight pins of the transistor interface device Q are arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4, wherein another row is sequentially arranged by a fifth pin 5, a sixth pin 6, a seventh pin 7 and an eighth pin 8, and the first pin 1 is opposite to the eighth pin 8, and the fourth pin 4 is opposite to the fifth pin 5.
The inner ends and the outer ends of the first pin 1, the third pin 3 and the fourth pin 4 are all parallel and level, the outer end of the second pin 2 is parallel and level with the outer ends of the first pin 1, the third pin 3 and the fourth pin 4, the inner end of the second pin 2 is more than the inner end of the second pin 2 by a first length L1, and a first extension part with a second length L2 vertically extends towards the third pin 3 from one side of the inner end of the second pin 2; the inner ends and the outer ends of the fifth pin 5, the seventh pin 7 and the eighth pin 8 are all flush, the outer end of the sixth pin 6 is flush with the outer ends of the fifth pin 5, the seventh pin 7 and the eighth pin 8, the inner end of the sixth pin 6 is more than the inner end of the fifth pin 5 by a third length L3, and one side of the inner end of the sixth pin 6 extends vertically towards the seventh pin 7 for a second extension part of a fourth length L4.
In order to maintain the original electrical safety characteristics and application properties of the product as much as possible, the original electrical gap and insulation thickness of the device need not be changed as much as possible. Therefore, the packaging of the transistor interface device Q needs to take into account the electrical gap, insulation thickness of the original device. In this embodiment, the distances between two adjacent pins in each row in the transistor interface device Q are the same and are both the first width D1, the widths of eight pins in the transistor interface device Q are the same and are both the second width D2, the distance between the first extension portion and the second extension portion is the third width D3, the distance from the first extension portion to the inner end of the third pin 3 is the fourth width D4, the distance from the second extension portion to the inner end of the seventh pin 7 is the fifth width D5, where D1 is equal to or less than D3 equal to or less than D1, D4 is equal to or greater than D1, D5 is equal to or greater than D1, D is the diameter of the functional multiplexing key conductive film, and typically D is equal to or greater than 3mm. Because D3 is less than or equal to D, the functional multiplexing key can be conducted when being pressed, and because D3 is more than or equal to D1, the insulating property of the transistor socket is not affected, and because D4 is more than or equal to D1, the insulating property of the transistor socket is not affected.
When the transistor interface device Q of this embodiment is adopted, the center position O of the functional multiplexing key conductive film is identical to the screen printing center position of the integrated package.
In a specific application, the first length L1 is equal to the fourth length L4 and is equal to the first width d1, and the fourth width d4 and the fifth width d5 are equal, where d1=1.52 mm, d2=1.02 mm, and d=3 mm.
As shown in fig. 3, a schematic structural diagram of a second embodiment of a transistor interface device Q in the functional multiplexing circuit board for a digital multimeter shown in fig. 1 is shown, in this embodiment, eight pins of the transistor interface device Q are arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4, wherein another row is sequentially arranged by a fifth pin 5, a sixth pin 6, a seventh pin 7 and an eighth pin 8, and the first pin 1 is opposite to the eighth pin 8, and the fourth pin 4 is opposite to the fifth pin 5.
In this embodiment, the inner ends and the outer ends of the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 are all flush; the inner ends and the outer ends of the fifth pin 5, the sixth pin 6, the seventh pin 7 and the eighth pin 8 are all flush, the distances between two adjacent pins in each row in the transistor interface device Q are the same and are all the sixth width D6, the widths of eight pins of the transistor interface device Q are the same and are all the seventh width D7, and the distances between the inner ends of the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 and the inner ends of the fifth pin 5, the sixth pin 6, the seventh pin 7 and the eighth pin 8 are the eighth width D8, wherein D6 is less than or equal to D8 is less than or equal to D, and D is the diameter of the functional multiplexing key conductive film. Since d8 is equal to or greater than d6, the insulating property of the transistor socket is not affected. In a specific application example, the sixth width d6=1.52 mm and d=3 mm.
As shown in fig. 4, a schematic structural diagram of a third embodiment of a transistor interface device Q in the functional multiplexing circuit board for a digital multimeter shown in fig. 1 is shown, in this embodiment, eight pins of the transistor interface device Q are in direct insertion and are arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4, another row is sequentially arranged by a fifth pin 5, a sixth pin 6, a seventh pin 7 and an eighth pin 8, the first pin 1 is adjacent to the eighth pin 8, the fourth pin 4 is adjacent to the fifth pin 5, a distance between two adjacent pins is smaller than D, and D is a diameter of a conductive film of the functional multiplexing key.
The embodiment of the invention also provides a digital multimeter which comprises the functional multiplexing circuit board for the digital multimeter.
The present invention is not limited to the above embodiments, and various modifications can be made within the technical content disclosed in the above embodiments. All equivalent structural changes made by the specification and the attached drawings of the invention or directly or indirectly applied to other related technical fields are included in the protection scope of the invention.
Claims (9)
1. The functional multiplexing circuit board for the digital multimeter is characterized in that a transistor interface device, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first resistance welding position for welding a first resistor, a second resistance welding position for welding a second resistor, a third resistance welding position for welding a third resistor and a fourth resistance welding position for welding a fourth resistor are arranged on the functional multiplexing circuit board for the digital multimeter; the transistor interface device consists of an NPN transistor and a PNP transistor and is provided with eight pins, wherein the eight pins comprise a first pin and a fourth pin which are connected with an emitter of the NPN transistor, a second pin which is connected with a base of the NPN transistor, a third pin which is connected with a collector of the NPN transistor, a fifth pin and an eighth pin which are connected with the emitter of the PNP transistor, a sixth pin which is connected with the collector of the PNP transistor and a seventh pin which is connected with a base of the PNP transistor;
The first pin is connected with one side of the first resistance welding position and one side of the second resistance welding position, the other side of the first resistance welding position is used for being connected with an analog-digital conversion port of a main control chip of the digital multimeter, and the other side of the second resistance welding position is grounded;
the first switch is connected between the first pin and one side of the third resistance welding position, and the other side of the third resistance welding position is used for being connected with a power supply of the digital multimeter;
the second switch is connected between the second pin and one side of the third resistance welding position;
the third switch is connected between the third pin and one side of the fourth resistance welding position, and the other side of the fourth resistance welding position is grounded;
The fourth pin is connected with the first pin;
The fourth switch is connected between the fifth pin and one side of the fourth resistance welding position;
One end of the fifth switch is connected with the sixth pin, and the other end of the fifth switch is connected with one side of the third resistance welding position;
the sixth switch is connected to one side of the seventh pin and one side of the fourth resistance welding position;
One end of the seventh switch is connected with the other end of the fifth switch and one side of the third resistance welding position, and the other end of the seventh switch is used for being connected with a key switch control function pin of the digital multimeter;
the eighth pin is connected with the fifth pin and is used for being connected with a power supply of the digital multimeter;
The first resistance welding position, the second resistance welding position, the third resistance welding position and the fourth resistance welding position are respectively welded with a first resistor, a second resistor, a third resistor and a fourth resistor, one end of the first resistor is connected with the first pin, the other end of the first resistor is connected with an analog-digital conversion port of a main control chip of the digital multimeter, the first switch, the third switch, the fourth switch and the sixth switch are all conducted, and the second switch, the fifth switch and the seventh switch are all disconnected, so that the functional multiplexing circuit board is used for a transistor measuring function;
The first resistance welding position, the second resistance welding position, the third resistance welding position and the fourth resistance welding position are all not welded with resistance, the first switch, the third switch, the fourth switch and the sixth switch are all disconnected, and the second switch, the fifth switch and the seventh switch are all conducted, so that the function multiplexing circuit board is used for key-press beginning control functions.
2. The functional multiplexing circuit board for a digital multimeter of claim 1 wherein eight pins of the transistor interface device are patch-type and are arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin, a second pin, a third pin, and a fourth pin, wherein another row is sequentially arranged by a fifth pin, a sixth pin, a seventh pin, and an eighth pin, and wherein the first pin is opposite the eighth pin, and the fourth pin is opposite the fifth pin.
3. The function multiplexing circuit board for a digital multimeter of claim 2, wherein inner ends and outer ends of the first pin, the third pin and the fourth pin are all flush, an outer end of the second pin is flush with outer ends of the first pin, the third pin and the fourth pin, the inner end of the second pin is more than the inner end of the second pin by a first length L1, and a side of the inner end of the second pin is vertically extended toward the third pin by a first extension of a second length L2; the inner ends and the outer ends of the fifth pin, the seventh pin and the eighth pin are all flush, the outer end of the sixth pin is flush with the outer ends of the fifth pin, the seventh pin and the eighth pin, the inner end of the sixth pin is more than the inner end of the fifth pin by a third length L3, and one side of the inner end of the sixth pin vertically extends towards the second extension part of the seventh pin by a fourth length L4.
4. The function multiplexing circuit board for a digital multimeter of claim 3, wherein distances between two adjacent pins in each row in the transistor interface device are the same and are both a first width D1, widths of eight pins of the transistor interface device are the same and are both a second width D2, a distance between the first extension portion and the second extension portion is a third width D3, a distance from the first extension portion to an inner end of the third pin is a fourth width D4, a distance from the second extension portion to an inner end of the seventh pin is a fifth width D5, wherein d1.ltoreq.d3.ltoreq.d, d4.gtoreq.d1, d5.gtoreq.d1, and D is a diameter of the function multiplexing key conductive film.
5. The functional multiplexing circuit board for a digital multimeter of claim 4 wherein the first length L1 is equal to the fourth length L4 and is equal to the first width d1, the fourth width d4 and the fifth width d5 are equal, wherein d1=1.52 mm, d2=1.02 mm, and d is ≡3mm.
6. The function multiplexing circuit board for a digital multimeter of claim 2 wherein inner and outer ends of the first, second, third and fourth pins are all flush; the inner ends and the outer ends of the fifth pin, the sixth pin, the seventh pin and the eighth pin are all flush, the distances between two adjacent pins in each row in the transistor interface device are the same and are all the sixth width D6, the widths of eight pins of the transistor interface device are the same and are all the seventh width D7, and the distances between the inner ends of the first pin, the second pin, the third pin and the fourth pin and the inner ends of the fifth pin, the sixth pin, the seventh pin and the eighth pin are the eighth width D8, wherein D6 is less than or equal to D8, and D is the diameter of the functional multiplexing key conductive film.
7. The function multiplexing circuit board for a digital multimeter of claim 6 wherein the sixth width d6=1.52 mm and d is greater than or equal to 3mm.
8. The function multiplexing circuit board for a digital multimeter of claim 1, wherein eight pins of the transistor interface device are in-line and arranged in two rows and four columns, wherein one row is sequentially arranged by a first pin, a second pin, a third pin, and a fourth pin, wherein another row is sequentially arranged by a fifth pin, a sixth pin, a seventh pin, and an eighth pin, and the first pin is adjacent to the eighth pin, the fourth pin is adjacent to the fifth pin, a distance between adjacent two pins is smaller than D, and D is a diameter of the function multiplexing key conductive film.
9. A digital multimeter comprising a functional multiplexing circuit board for a digital multimeter according to any one of claims 1 to 8.
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| CN201811259802.9A CN109061266B (en) | 2018-10-26 | 2018-10-26 | Function multiplexing circuit board for digital multimeter and digital multimeter |
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| CN201811259802.9A CN109061266B (en) | 2018-10-26 | 2018-10-26 | Function multiplexing circuit board for digital multimeter and digital multimeter |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| TWI458990B (en) * | 2013-01-24 | 2014-11-01 | Cyrustek Corp | Digital multi-meter with lcr function |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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