Direct current ammeter with electric signal adjusting function
By introducing a regulating electrical signal function into the DC ammeter, and adjusting pointer deflection is adjusted using a detector diode and an adjustable potentiometer, the problem of pointer not staying at the zero mark is solved, and the accurate indication and high resolution of the ammeter are achieved.
Patent Information
- Application Number
- CN202421162911.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing pointer-type DC 4-20mA analog meter does not stay on the zero line when the current is 4mA, resulting in a decrease in the resolution of the ammeter.
The DC ammeter with its own adjustable signal function is adopted. Through the first and second branches connected in parallel, the first and second detector diodes and adjustable potentiometers are used to adjust the deflection direction of the pointer so that it stays on the zero line at 4mA and is accurately aligned with the full line at 20mA.
Accurate indicators of the pointer within different current ranges are achieved, ensuring the resolution of the ammeter, and it is simple to operate and low cost.
Smart Images
Figure CN223123103U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric meters, in particular to a DC ammeter with a built-in function of adjusting electric signals. Background Art
[0002] A pointer ammeter works based on the magnetoelectric principle, drives the pointer to move, and relies on the position where the pointer stays on the panel to display the reading. Taking the common pointer-type DC 4-20mA analog ammeter on the market as an example, this product is designed specifically for use with frequency converters. As Figure 5 shown, the standard input range of this ammeter is 4-20mA, mainly used for the display of analog current. Specifically, when the corresponding input signal is 4mA, the ammeter shows 0 at this time; when the corresponding input signal is 20mA, the reading of the ammeter is 50A. That is to say, as long as the input signal exceeds 4mA, the ammeter will start to work, and it will continue until the position of 20mA, at which time the reading of the ammeter reaches the maximum value, which is 50A.
[0003] However, the above ammeter has the following deficiencies in actual application: when the current is 4mA, the pointer will not stay on the zero scale line. Instead, it will deviate to one-fifth of the scale line. But when the current is 20mA, the pointer will reach the full scale line position, that is, 50A. Such a situation will reduce the resolution of the ammeter. Summary of the Invention
[0004] The purpose of the utility model is to solve the problem that in the application process of the pointer-type DC 4-20mA analog ammeter in the prior art, when the current is 4mA, the pointer will not stay on the zero scale line, which will reduce the resolution of the ammeter, and to propose a DC ammeter with a built-in function of adjusting electric signals.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A DC ammeter with a built-in function of adjusting electric signals includes a positive terminal and a negative terminal. A first branch and a second branch are connected in parallel between the positive terminal and the negative terminal. A first detection diode is connected between the first branch and the positive terminal; the first branch includes a second detection diode and a resistor connected in series, the second branch includes a first adjustable potentiometer; a third branch is connected between the first branch and the second branch, and the third branch includes a second adjustable potentiometer and a meter head connected in series.
[0007] In some embodiments, the meter head is the meter head of an mA ammeter.
[0008] In some embodiments, the positive terminal and the negative terminal are installed on the meter head.
[0009] In some embodiments, the resistor is a 220-ohm, 1 / 4-watt resistor.
[0010] In some embodiments, the first detection diode and the second detection diode are germanium diodes IN60P.
[0011] In some embodiments, the first adjustable potentiometer is a 500-ohm adjustable potentiometer.
[0012] In some embodiments, the second adjustable potentiometer is a 200-ohm adjustable potentiometer.
[0013] Compared with the prior art, the present utility model provides a DC ammeter with a built-in function of adjusting electrical signals, having the following beneficial effects.
[0014] In the present utility model, when the input current is less than 2 mA, the second detection diode is not conducting, and the current flowing through the meter head is a reverse current. At this time, the pointer of the ammeter deflects in the reverse direction; please refer to again Figure 3 , when the input current is greater than 2 mA, the second detection diode conducts forward. At this time, the pointer of the ammeter deflects in the forward direction. Further, when the input current reaches 4 mA, the pointer deflects in the forward direction, and by adjusting the first adjustable potentiometer, the pointer deflects in the forward direction and then aligns with the zero scale line, that is, it stays on the zero scale line; then continue to increase the current to 20 mA, and by adjusting the second adjustable potentiometer, the pointer can be aligned with the full scale line at 50 A; in summary, the present utility model has the function of adjusting electrical signals, ensuring the accuracy of the pointer indication position; in addition, during debugging, a single person can perform simple operations, and the selected electronic components have low costs, being economical and practical.
[0015] Parts not involved in this device are the same as those in the prior art or can be implemented using the prior art. When the current is 4 mA during the use of the present utility model, the pointer stays on the zero scale line, ensuring the resolution of the ammeter.
[0016] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, they will be obvious to those skilled in the art; or, they can be learned from the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the present utility model.
[0018] Figure 2 is a schematic principle Figure 1 .
[0019] Figure 3 is a schematic principleFigure 2 。
[0020] Figure 4 It is a schematic diagram of the scale line after the implementation of the present utility model.
[0021] Figure 5 It is a schematic diagram of the scale line in the prior art pointed out in the background art.
[0022] The reference numerals in the drawings are as follows:
[0023] 1. Positive terminal; 2. Negative terminal; 3. First detection diode; 4. Second detection diode; 5. Resistor; 6. First adjustable potentiometer; 7. Second adjustable potentiometer; 8. Meter head. Detailed implementation manners
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0025] Referring to Figures 1 - 5 , a DC ammeter with a self - regulating electrical signal function, includes a positive terminal 1 and a negative terminal 2. A first branch and a second branch connected in parallel are connected between the positive terminal 1 and the negative terminal 2. A first detection diode 3 is connected between the first branch and the positive terminal 1; the first branch includes a second detection diode 4 and a resistor 5 connected in series, and the second branch includes a first adjustable potentiometer 6; a third branch is connected between the first branch and the second branch, and the third branch includes a second adjustable potentiometer 7 and a meter head 8 connected in series.
[0026] In this embodiment, the positive terminal 1 and the negative terminal 2 are installed on the meter head 8
[0027] Specifically, the meter head 8 is a meter head of an mA ammeter.
[0028] As an implementable manner, the resistor 5 uses a 220 - ohm, 1 / 4 - watt resistor.
[0029] As an implementable manner, the first detection diode 3 and the second detection diode 4 use germanium diodes IN60P.
[0030] As an implementable manner, the first adjustable potentiometer 6 uses a 500 - ohm adjustable potentiometer.
[0031] As an implementable manner, the second adjustable potentiometer 7 uses a 200 - ohm adjustable potentiometer.
[0032] The working principle of the present utility model is as follows:
[0033] Please refer to again Figure 2 When the input current is less than 2 mA, the second detection diode 4 is not conducting, and the current flowing through the meter head 8 is the reverse current. At this time, the pointer of the ammeter deflects in the reverse direction; please refer to again Figure 3 When the input current is greater than 2 mA, the second detection diode 4 conducts forward. At this time, the pointer of the ammeter deflects in the forward direction. Further, when the input current reaches 4 mA, the pointer remains deflected in the forward direction, and by adjusting the first adjustable potentiometer 6, the pointer is made to align with the zero graduation line after deflecting in the forward direction, that is, it stays on the zero graduation line; then continue to increase the current and when it reaches 20 mA, the second adjustable potentiometer 7 can also be adjusted to make the pointer align with the full scale graduation line at 50 A. In summary, the utility model has the function of adjusting the electrical signal, ensuring the accuracy of the pointer indication position.
[0034] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the utility model, according to the technical solution of the utility model and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the utility model.
[0035] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0036] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the utility model.
Claims
1. A DC ammeter with a built-in function of adjusting electrical signals, comprising a positive terminal (1) and a negative terminal (2), characterized in that, A first branch and a second branch which are connected in parallel are connected between the positive terminal (1) and the negative terminal (2). A first detection diode (3) is connected between the first branch and the positive terminal (1); the first branch includes a second detection diode (4) and a resistor (5) which are connected in series, and the second branch includes a first adjustable potentiometer (6); a third branch is connected between the first branch and the second branch, and the third branch includes a second adjustable potentiometer (7) and a meter head (8) which are connected in series.
2. The DC ammeter with a self-adjusting electric signal function according to claim 1, wherein The meter head (8) is a meter head of an mA ammeter.
3. A DC ammeter with a built-in function of adjusting electrical signals according to claim 1, characterized in that, The positive terminal (1) and the negative terminal (2) are installed on the meter head (8).
4. A DC ammeter with a built-in function of adjusting electrical signals according to claim 1, characterized in that, The resistor (5) uses a 220-ohm, 1 / 4-watt resistor.
5. A DC ammeter with a built-in function of adjusting electrical signals according to claim 1, characterized in that, The first detection diode (3) and the second detection diode (4) use germanium diodes IN60P.
6. The DC ammeter with a built-in function of adjusting electrical signals according to claim 1, characterized in that, The first adjustable potentiometer (6) uses a 500-ohm adjustable potentiometer.
7. A DC ammeter with a built-in function of adjusting electrical signals according to claim 1, characterized in that, The second adjustable potentiometer (7) uses a 200-ohm adjustable potentiometer.