KR890007455Y1 - Network resistor indicator - Google Patents

Abstract

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Description

Network resistance discriminator

1 is an external circuit diagram and an external circuit diagram of a network resistor.

2 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: network resistor 2: reference resistor

3: Ohmic resistance detection unit 4: Oagate

5 display unit 31 error detection circuit

32: magnification designation circuit 33: magnification amplification circuit

34: discrimination circuit Vref: reference voltage

R ₁ -R _n-1 : Network resistance VR ₁ -VR _n-1 : Variable resistor

J ₁ -J _n : connection point

The present invention relates to a network resistance discriminator for determining whether or not the network resistance used for transmission and reception impedance matching.

When determining the quantity or failure of the conventional network resistance, use a conventional resistance measuring instrument to measure the resistance value at each terminal of the network resistance, and then check whether the resistance values are within the tolerance range or exceed the tolerance range. Discrimination was made accordingly. By the way, the network resistance has several network resistances R ₁ -R _{n-1 in} one network resistor 1, as shown in FIG. ₁ , and each of the network resistances R ₁ -R _n-1 . Because it has terminals (J ₁ -J _n ) for, and its shape is small and the internal resistance value is not standardized, it is necessary to measure the value of the network resistance (R ₁ -R _n-1 ). In the case of using, the inconvenience of having to inspect each terminal (J ₁ -J _n-1 ) requires a lot of time to measure the network resistance.

In view of the above circumstances, the present invention aims to provide a network resistance discriminator which makes it easy to discriminate quantity and defects in accordance with the resistance value in a short time in mass production of network resistance. It will be described in detail as follows.

The present invention is a variable resistor (VR _1- VR _n ) is connected to each terminal (J ₁ -J _n-1 ) of the network resistor ( ₁ ) adjusted to the reference resistance value of the network resistor (R ₁ -R _n-1 ) _The resistance in the network resistor 1 connected to the reference resistance point 2 composed of _-1 ) and each connection point J ₁ -J _{n-1 of the} network resistor 1 and the reference resistance point 2. Incorrect resistance detection unit 3 for detecting whether resistance R ₁ -R _n-1 exceeds the tolerance, and inferior resistance detection unit 3 connected to each connection point J ₁ -J _n-1 . The OA gate 4 outputs a signal corresponding to at least one of the outputs of the outputs of the outputs of the outputs and an external display indicating whether the network resistor 1 passes or fails in accordance with the output signal of the OA gates 4. It consists of the display part 5.

Here, the network resistor 1 and the reference resistance designator 2 can be integrally connected by using a pin connector or the like. The resistance resistors 3 are connected to the connection points, respectively. An error detection circuit 31 for detecting an error between the reference resistance value of the network resistors R ₁ -R _n-1 and the variable resistors VR _1- VR _n-1 by the reference voltage Vref, and an error range. A magnification resistance circuit 33 that amplifies the output voltage of the error detection circuit 31 by a magnification designation circuit 32 specifying? And an output resistance of the magnification amplifier circuit 33 are compared with the output voltage of the magnification amplification circuit 33 according to the reference voltage Vref. And a judging circuit 34 for judging. To explain the operation of the present invention with a specific example below, the B power supply is 2V, the reference voltage Vref is 1/2 of the power supply is 1V, the resistance of any one resistor (R ₁ ) in the network resistor (1) When the value is 100Ω and the tolerance is ± 5%, connect each variable resistor (VR ₁ -VR _n ) of the reference resistor (2) to the terminal (J ₁ -J _n-1 ) of the network resistor (1). Connect using a normal connector and set the resistance value of the variable resistor (VR ₁ ) to 100Ω correctly. Next, since the tolerance is 5%, the magnification designator 32 designates the magnification in the magnification amplifier 33 with 1 / error = 1 / 0.05 = 20. If we assume that the value of resistor R ₁ is exactly 100 Ω, then the voltage at junction J ₁ is B voltage × R ₁ / (R ₁ + VR ₁ ) = 2 × 100 / (100 + 100) = 1 ( V), which is the same value as the reference voltage Vref, so that the outputs of the error detection circuit 31 and the discrimination circuit 34 become 0 (V).

If the value of the resistor R ₁ has an error of 95 (Ω), that is, 5%, the voltage at the connection point J ₁ becomes 2 × 95 / (100 + 95) ≒ 0.9744 (V). Referring to the operation of the magnification amplification circuit 33, the magnification amplification circuit 33 is designated by the inverse of the tolerance from the magnification designation circuit 32, but the inside of the magnification amplification circuit 33 is a connection point (J). _When the voltage of 1) is greater than 1 (V), the amplification operation is performed at the magnification of 2x1 specified magnification and at magnification of 2x1 -1 specified magnification. Therefore, in the above example, since the connection point J ₁ voltage is 0.9744 (V), the amplification operation of the magnification amplifier circuit 33 is performed at a magnification of 20 × 2-1 = 39.

Therefore, the output of the magnification amplifier circuit 33 becomes error voltage x magnification = (1-0.9744) x 39 = 1 (V). Since this value is equal to the reference voltage 1 (V), the output of the discrimination circuit 34 is at a low level.

If the value of the resistor R ₁ is 105 (Ω), as described above, the voltage at the connection point J ₁ becomes 2 × 105 / (100 + 105) = 1.0244V and the magnification of the magnification amplifier 33 is 20 ×. The magnification is 2 + 1 = 41. Therefore, the output of the magnification amplification circuit 23 becomes (1.0244-1) x 41 = 1 (V), and this also shows a low level through the discriminating circuit 34.

If the value of the resistor R ₁ is outside the tolerance range of 94 (Ω) or 106 (Ω), the output of the multiplier amplifier circuit 33 in the case of 94Ω is (1-94 / (100 + 94) X 2) x (1 / 0.05 x 2-1) = 1.2 (V), and the output of the magnification amplification circuit 33 when 106 (Ω) is (1-106 / (100 + 106) x 2 X (1 / 0.05 x 2 + 1) = 1.2 (V), and the output of the discriminating circuit 34 in these cases becomes a high level.

In this way, whether the value of the network resistance (R ₁ -R _n-1 ) is within the tolerance range is detected and input to the oragate (4), the network resistance (R ₁ -R _n-1 ) is When all of the values are within the tolerance range, the output of the oar gate 4 is at a low level, indicating the pass state through the display unit 5, and allowing any of the network resistances R ₁ -R _{n -1} . If something is out of the error range, the output of the oragate 4 is at a high level, and the display unit 6 indicates a failing state.

By simply connecting the network resistor 1 to the reference resistor 2 in this manner, it is possible to determine the quantity and failure of the network resistors R ₁ -R _n-1 , thereby enabling a simple and quick inspection. In addition to the resistors, other components such as capacitors and coils can be inspected by applying the circuit of the present invention.

As described above, the present invention can prevent the hassle and mistakes of measuring the terminals of the network resistance, and in particular, it is possible to shorten the inspection time when inspecting a large amount of network resistance, thereby improving productivity. .

Claims (2)

Variable resistors VR ₁ -VR _n-1 connected to respective terminals J ₁ -J _n-1 of the network resistor ₁ by adjusting the network resistances R ₁ -R _n-1 to reference resistance values. Each resistance R in the network resistor 1 is connected to the reference resistance indicator 2 composed of the network resistor 1 and each connection point J ₁ -J _{n -1} of the network resistor 1 and the reference resistance detector 2. Among the outputs of the error resistance detection unit 3 for detecting whether ₁ -R _n-1 exceeds the tolerance and the error resistance detection unit 3 connected to each of the connection points J ₁ -J _n-1 . OA gate (4) for outputting a signal for detecting at least one error resistance and a display unit (5) for indicating the pass and fail of the network resistor 1 in accordance with the output signal of the ora gate (4) Network resistance discriminator, characterized in that. In the first resistor, the error resistance detector 3 detects an error between a reference resistance value of the network resistors R ₁ -R _n-1 and the variable resistors VR _1- VR _n-1 . (31), a magnification amplifying circuit (33) for amplifying the output voltage of the error detection circuit (31) by a magnification designating circuit (32) specifying an error range, and a magnification amplifying circuit (33) in accordance with the reference voltage Vref. And a discriminating circuit (34) for comparing the output voltages to discriminate error resistance.