CN215005615U - Four-wire impedance measurement auxiliary probe suitable for small resistor - Google Patents

Abstract

The utility model belongs to the technical field of the electric test, a four-wire impedance measurement auxiliary probe suitable for small resistance is related to, including first cap and second cap, first wire is even out to the inboard of first cap, the second wire is even out to the inboard of second cap, the end of first wire with the end of second wire all electrically conducts and connects in a probe head. This auxiliary probe has avoided the test position size too little and has leaded to four pens of concurrent operation to be difficult to compromise the complete problem of contact, and is single just can operate, and efficiency of software testing is high and measuring result is accurate, has avoided the misdetection.

Description

Four-wire impedance measurement auxiliary probe suitable for small resistor

Technical Field

The utility model relates to an electric test technical field, in particular to four-wire impedance measurement auxiliary probe suitable for small resistance.

Background

At present, when measuring defective products, sometimes the impedance of a small conductor or a PCB (printed circuit board) wire resistance needs to be measured, a four-wire impedance measurement method of a digital multimeter 1 is required, as shown in figure 1, and the operation method is as follows: two probes of the red pen 11 are contacted with one end of the resistor 2 together, and two probes of the black pen 12 are contacted with the other end of the resistor 2 together. The basic principle of four-wire impedance measurement is: one group of red and black pen-shape meters is the loop (current gear) of the constant current source of the multimeter, the other group of red and black pen-shape meters is the loop for measuring the voltage (voltage gear) of the resistor to be measured, because the impedance magnitude of the voltage gear is many times larger than the measured impedance, almost no current flows through the path of the voltage measuring loop, the measured voltage is the voltage at the two ends of the resistor to be measured, and the accurate resistance value of the resistor to be measured can be obtained according to the ohm law R-V/I. The wire resistance of the stylus will not affect the test result, but this method has some disadvantages:

1. four meter pens are used for measurement at the same time, so that the operation is difficult for a single person, and two persons are required to operate simultaneously, so that the working efficiency is not high;

2. because the probe head is thick, for small-sized resistors or tiny PAD points, two probes do not contact the PAD point at the same time well, which results in poor measurement accuracy.

Therefore, it is necessary to develop an auxiliary tool to solve the above problems.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a four-wire impedance measurement auxiliary probe suitable for small resistance can conveniently carry out four-wire impedance measurement to small resistance.

The utility model discloses a following technical scheme realizes above-mentioned purpose: the utility model provides a four-wire impedance measurement auxiliary probe suitable for small resistor, includes first cap and second cap, first wire is even gone out to the inboard of first cap, the second wire is even gone out to the inboard of second cap, the end of first wire with the end of second wire all conductively connected in a probe head.

Specifically, the first pen cap and the second pen cap are connected in parallel through an insulated connecting part, and the opening direction of the first pen cap and the opening direction of the second pen cap are in the same direction.

Further, the rear end of the probe head is fixed on the connecting part.

Specifically, the first lead and the second lead are connected to different heights of the probe head.

Specifically, the front end of the probe head is conical.

The utility model discloses technical scheme's beneficial effect is:

this auxiliary probe has avoided the test position size too little and has leaded to four pens of concurrent operation to be difficult to compromise the complete problem of contact, and is single just can operate, and efficiency of software testing is high and measuring result is accurate, has avoided the misdetection.

Drawings

FIG. 1 is a schematic diagram of a digital multimeter measurement;

FIG. 2 is a sectional view of an auxiliary probe in accordance with example 1;

FIG. 3 is a schematic view of the structure of an auxiliary probe in example 2;

FIG. 4 is a perspective view of an auxiliary probe according to example 3.

The figures in the drawings represent:

1-digital multimeter, 11-red meter pen, 12-black meter pen;

2-resistance;

3 a-a first cap, 3 b-a second cap, 31-an opening;

4-probe head, 41-rear end, 42-front end;

5 a-a first wire, 5 b-a second wire;

6-connecting part.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Example 1:

as shown in fig. 2, the utility model discloses a four-wire impedance measurement auxiliary probe suitable for small resistance, including first cap 3a and second cap 3b, first wire 5a is connected out to the inboard of first cap 3a, and second wire 5b is connected out to the inboard of second cap 3b, and the end of first wire 5a and the end of second wire 5b all electrically conductive connection are in a probe head 4. When the auxiliary probe is used in pairs, the first pen cap 3a and the second pen cap 3b are simultaneously inserted with two meter pens, wherein one meter pen is used for being in conductive connection with two red meter pens 11, and the other meter pen is used for being in conductive connection with two black meter pens 12; the probe head 4 is then used to contact the resistors so that the contact test points of the two red pens 11 change from two to one and the contact test points of the two black pens 12 also change from two to one. Therefore, the problem that the four meter pens are difficult to simultaneously operate and contact completely due to the fact that the size of the test position is too small is solved, the test can be performed by a single person, the test efficiency is high, the measurement result is accurate, and misdetection is avoided.

Example 2:

as shown in fig. 3, the difference from embodiment 1 is that: the first cap 3a and the second cap 3b are connected in parallel by an insulated connecting portion 6, and the opening direction of the first cap 3a and the opening direction of the second cap 3b are in the same direction. Thus, the first cap 3a and the second cap 3b are connected into a whole by the connecting part 6, and the structure has certain rigidity and is easier to store.

As shown in fig. 3, the rear end 41 of the probe head 4 is fixed to the connecting portion 6. Therefore, the first pen cap 3a, the second pen cap 3b and the probe head 4 are connected into a rigid whole, so that after the two meter pens are inserted, the position of the probe head 4 is easy to control, and the probe head 4 can be accurately abutted against a test point of a resistor when the two meter pens are held by one hand.

As shown in fig. 3, the first wires 5a and the second wires 5b are connected to different heights of the probe head 4. Thus, the conductive part of the auxiliary probe is in an asymmetric structure, and the first pen cap 3a and the second pen cap 3b can be distinguished from a current measuring meter pen or a voltage measuring meter pen. When the test is inaccurate, the problem can be found out on which pen cap or lead.

Example 3:

as shown in fig. 4, the difference from embodiment 2 is that: the front end 42 of the probe head 4 is tapered. The contact position of the probe head 4 and the resistor is further reduced, and the situation of smaller conductive position can be met. Other tip narrowing configurations may be used for the probe head 4.

As shown in FIG. 4, the openings 31 of the first cap 3a and the second cap 3b are enlarged outwardly. This facilitates the insertion of the tip of the stylus into the first cap 3a and the second cap 3 b.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims (6)

1. The utility model provides a four-wire impedance measurement auxiliary probe suitable for little resistance which characterized in that: the probe comprises a first pen cap and a second pen cap, wherein the inner side structure of the first pen cap and the inner side structure of the second pen cap are matched with the head of a probe, a first lead is connected to the inner side of the first pen cap, a second lead is connected to the inner side of the second pen cap, and the tail end of the first lead and the tail end of the second lead are in conductive connection with a probe head.

2. The four-wire impedance-measuring auxiliary probe for small resistors of claim 1, wherein: the first pen cap and the second pen cap are connected in parallel through an insulated connecting part, and the opening direction of the first pen cap is the same as that of the second pen cap.

3. The four-wire impedance-measuring auxiliary probe for small resistors according to claim 2, wherein: the rear end of the probe head is fixed on the connecting part.

4. The four-wire impedance-measuring auxiliary probe for small resistors of claim 1, wherein: the first and second wires are connected to different heights of the probe head.

5. The four-wire impedance-measuring auxiliary probe for small resistors of claim 1, wherein: the front end of the probe head is conical.

6. The four-wire impedance-measuring auxiliary probe for small resistors of claim 1, wherein: the openings of the first pen cap and the second pen cap are outwards enlarged.

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