KR100541422B1 - A portable equipment for testing electric device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric test equipment, comprising: a probe, a ground connection means for connecting to a ground terminal of a measurement object, a voltage input unit for receiving a voltage applied to the probe, and a test voltage at a level set by the voltage input unit. When the voltage level input from the voltage input unit is equal to or less than zero potential, a ground display is displayed, and if the test voltage level is higher than the set test voltage level, a control signal for displaying the detected voltage level is output. A control unit and display means for displaying the display signal from the control unit according to the control signal may be configured to display the measurement standby state so that the user can easily recognize the measurement standby state. In addition, the present invention selectively turns on a plurality of lamps in accordance with the measured voltage, so that the measured voltage can be intuitively recognized.

Description

Portable electric test equipment {A portable equipment for testing electric device}

1 is an external view of a portable electric test equipment according to a preferred embodiment of the present invention;

2 is a plan view of the display / operation panel;

3 is a circuit diagram of the main body shown in FIG. 1;

4 is a circuit diagram of the voltage input unit shown in FIG. 3;

5 is a time chart for explaining the operation of the present invention according to the input voltage,

6 is a view showing an example of use of the present invention.

<Explanation of symbols for main parts of the drawings>

10: main body 11: probe

12: display / operation panel 20: ground connection means

21: plug 22: cable

23: terminal connection clamp 30: extension probe means

31: detachable coupling portion 32: extension cable

33: auxiliary probe 110: control panel

111, 112: Operation button 120: Voltage input section

121: operational amplifier 122: voltage divider and smoothing circuit

130: control unit 140: measurement display lamp unit

150: segment display section 160: mode display lamp section

161, 162: Measurement mode lamp 163: Low voltage warning lamp

170: lighting lamp unit 171: push button

172: resistance 173: light emitting diodes

The present invention relates to a portable electrical test equipment, and more particularly to a portable electrical test equipment that can detect and display the measurement standby status.

As is well known, when examining the electrical phenomena of automobiles, it is common to introduce a relative concept rather than an absolute figure, which tends to be more pronounced if the electrical components work together with the mechanical components.

Most auto mechanics in the field work on the basis of electrical basic knowledge in addition to the knowledge in the mechanical field, which can be attributed to the relatively high proportion of mechanical parts in the mechanics field.

However, since the beginning of the application of mechatronics to automobiles, an increasing number of electrical / electronic equipments are increasingly being used in automobiles, and maintenance technology for the electrical / electronic field has become essential.

Lamp testers and digital multimeters are used as simple equipment used by mechanics in the field to test voltage / frequency of each electric / electronic device of a vehicle.

The lamp tester is a device for intuitively recognizing a voltage and a frequency by turning on a lamp according to a voltage and a frequency when the probe contacts a terminal of a test target, and the digital multimeter contacts the probe to a terminal of a test target. It is a device that measures resistance, current, voltage (AC / DC) digitally and displays it through liquid crystal or segment display device.

However, the above-described conventional lamp tester, digital multimeter, and the like contact the probe with any terminal by displaying zero potential both in the open state of the circuit which does not touch the probe or the contact with the ground terminal of the test target. There was a problem in that the open circuit state, that is, the measurement standby state, was not known.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a portable electric test equipment that can detect and display the measurement standby state.

Portable electrical test equipment according to the present invention for achieving the above object, the probe, a ground connection means for connecting to the ground terminal of the measurement object, a voltage input unit for receiving the voltage applied to the probe, and the voltage input unit In addition to applying the test voltage of the set level, if the voltage level input from the voltage input unit is below the zero potential, the ground display is displayed; if the test voltage level is higher than the measurement standby state display; And a display unit for displaying a control signal from the control unit and displaying the control signal from the control unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an external view of a portable electrical test equipment according to a preferred embodiment of the present invention, as can be seen with reference to the same figure, the portable electrical test equipment according to the present invention, the user's hand pen (pen) The main body is formed in the form and is provided with a probe 11 at one end and a jack (not shown) for connecting a ground end at the other end and a display / operation panel 12 (see FIG. 2) at one side. (10) and a ground connecting means (20) including a plug (21) detachably coupled to the connecting jack of the main body (10) and a cable (22) and a terminal connecting clamp (23). .

In addition, the present invention, the extended probe means comprising a detachable coupling portion 31 detachably coupled to the probe 11 of the main body and the extension cable 32 and the auxiliary probe 33 connected to the extension cable (32) It may further include (30), which is optional, it is not essential to constitute the present invention.

As shown in FIG. 3, the main body 10 includes an operation unit 110, a voltage input unit 120, a control unit 130, a measurement display lamp unit 140, a segment display unit 150, and a mode display lamp unit ( 160, an illumination lamp unit 170, and a battery (not shown) are installed.

The operation unit 110 includes a plurality of operation buttons 111 and 112 provided on the display / operation panel 12, and when the operation buttons 111 and 112 are operated, a corresponding key signal is generated to generate a control signal 130. ).

The voltage inputter 120 inputs a voltage applied from the probe 11 and the controller 130 to the controller 130. For example, as illustrated in FIG. 3, the non-inverting terminal of the operational amplifier 121 ( (+) Is connected to the voltage input terminal through a voltage divider and smoothing circuit 122 consisting of a plurality of resistance elements (R1, R2) and capacitors (C1, C2), and the inverting terminal (-) is directly connected to the output terminal. Voltage floor circuits can be used. For reference, reference numeral R3, which is not described, is an element protection resistor at the output terminal of the operational amplifier 121.

The controller 130 applies a test voltage (for example, about 1 volt) of a set level to the input terminal of the voltage input unit 120 through the resistor R4 and the diode D0, and from the voltage input unit 120. If the detected voltage level is less than zero potential, the ground display is displayed. If the test voltage level is equal to or higher than the set reference voltage (for example, about 3 volts) A control signal for displaying the voltage level is output.

The measurement display lamp unit 140 includes a plurality of lamps 141 to 143 disposed on the display / operation panel 12, and each lamp 141 to 143 includes a plurality of light emitting diodes emitting different colors. D1 to D9 are provided, and the light emitting diodes D1 to D9 of the lamps 141 to 143 are configured to emit one of the light emitting diodes D1 to D9 corresponding to the measured voltage by the control of the controller 130. have.

The segment display unit 150 is composed of a predetermined number of segments for displaying numerals or letters using light emitting elements such as light emitting diodes, and is arranged on the display / operation panel 12, and is controlled by the control unit 130. It is configured to display the measured value such as the measured value and ground state or measurement standby state.

The mode display lamp unit 160 includes lamps 161 and 162 indicating a measurement mode and a low voltage warning lamp 163 warning a low voltage below a set reference voltage. Each lamp 161 to 163 includes a controller 130. ) Is turned on by each of the light emitting diode elements D10, D11, and D12 driven under control.

The lighting lamp unit 170 includes a pushbutton 171 disposed on the display / operation panel 12, a light emitting diode 173 disposed at an end portion of the main body 10 provided with a short-circuit resistant resistor 172 and a probe 11. It is configured to include).

Here, the light emitting diode 173 is used for illumination, and since it is necessary to generate sufficient brightness, it is preferable to use a high brightness light emitting diode element.

For reference, the ground end of each component provided in the main body 10 as described above is connected to the ground end of the measurement object via the ground connection means 20.

Now, the effects of the present invention configured as described above will be described with reference to the accompanying drawings.

First, as illustrated in FIG. 5, in a state where the user couples the plug 21 of the ground connecting means 20 to the main body 10, the forceps 23 are connected to the ground end of the measurement target (eg, the sound of the car battery). When the main body 10 is turned on by operating the operation button 112 after being bitten by a (-) electrode or a vehicle body), since the probe 11 is not in contact with the measurement object, the control unit 130 The output test voltage (eg, about 1 volt) is input to the voltage inputter 120.

Accordingly, the controller 130 senses that the test voltage level (for example, about 1 volt) is input from the voltage input unit 120, and displays a message indicating that the measurement standby state is performed through the segment display unit 150 (see FIG. 6).

In the measurement standby state, when the user touches the probe 11 to the positive electrode of the measurement object, the voltage of the positive electrode of the measurement object is input to the controller 130 through the voltage input unit 120. .

At this time, the controller 130 compares the voltage input from the voltage input unit 120 with a set reference voltage (for example, about 3 volts), and if the input voltage is less than the set reference voltage, the low voltage of the mode display lamp unit 160. By turning on the warning lamp 163, the user is warned of the low voltage state (see FIG. 6).

If the input voltage is greater than or equal to the set reference voltage, the controller 130 displays the voltage detected through the segment display unit 150 as a number, and together with the light emitting diodes D1 to D9 of the measurement display lamp unit 140. By turning on a light emitting diode preset to indicate the corresponding detection voltage, the user can intuitively easily recognize the current detection voltage.

When the user touches the probe 11 to the negative electrode or the ground terminal of the measurement object, a voltage below zero potential is input to the voltage input unit 120, so that the control unit 130 includes a segment display unit ( A message (eg, “0.0”) indicating a ground potential is displayed through the display 150, and a preset value of zero is displayed among the light emitting diodes D1 to D9 of the measurement display lamp unit 140. Turn on the light emitting diode.

On the other hand, when the measurement object is dark and hard to see, when the user presses the pushbutton 171, the light emitting diode 173 of the lighting lamp unit 170 is turned on, and thus the area indicated by the probe 11 is illuminated. It is easy to check the terminal of the object.

The portable electric test apparatus of the present invention, particularly in the automotive maintenance site, the performance test of the battery, the test of the power window motor, the test of the injector, the test of the power transistor, the test of the throttle position sensor, the test of the oxygen sensor, the vehicle speed sensor Test, airflow sensor test, engine start control relay test, automatic transmission pulse generator test, wheel speed sensor test, MAP sensor (Manifold Absolute Pressure Sensor) test, injection pump rotation sensor This is useful for testing various sensors and electric / electronic devices of automobiles, such as the test of the antenna, the fault check of the antenna, the test of the horn, and the wiper test.

The present invention is described above by illustrating specific embodiments, but the present invention is not limited to the above embodiments. Those skilled in the art can easily make various changes and modifications to the present invention, and it should be noted that such variations or modifications are included within the scope of the present invention as long as the features of the present invention are used.

In particular, in the above-described embodiment of the present invention, only the configuration for measuring and displaying the voltage has been described, but this is only an example of the essential components related to the gist of the present invention, frequency, resistance, current using known techniques It may also include a technical configuration for measuring and displaying.

As described above, in the present invention, when the voltage level corresponding to the test voltage is input by applying the test voltage to the voltage input unit, it is recognized as a measurement standby state and displayed thereon, so that the user can easily recognize the measurement standby state. There is.

In addition, the present invention has an effect of intuitively recognizing the measured voltage by selectively lighting a plurality of lamps in accordance with the measured voltage.

Claims (6)

In the portable electrical test equipment having a main body connected to the probe and the ground connection means for testing the electrical characteristics of the measurement object, A voltage input unit configured to receive a test voltage of a set level, and output a voltage applied through the probe and a test voltage of the input set level; As the main body is turned on, a test voltage having the set level is input to the voltage input unit, and a differential display control signal is output according to the voltage level applied from the voltage input unit. Outputs a control signal for display and outputs a control signal for displaying a measurement standby state if the voltage level is the test voltage level of the set level; and controls the detected voltage level display if the voltage level is equal to or higher than a predetermined reference voltage level. A control unit for outputting a signal; And And a display means for displaying in accordance with the control signal from the controller. The portable electrical test apparatus according to claim 1, wherein the display means comprises a segment display unit. The portable electric test apparatus according to claim 1, wherein the display means includes a plurality of light emitting elements each of which lights up according to the detected voltage range. The portable electric test apparatus according to claim 1, wherein the display means includes a low voltage warning light emitting device that lights when a voltage below the predetermined reference voltage is detected. The portable electrical test apparatus according to claim 1, further comprising an extension probe means including a detachable coupling part detachably coupled to the probe, an extension cable, and an auxiliary probe connected to the extension cable. The portable electric test apparatus according to claim 1, further comprising an illumination lamp disposed to illuminate a portion indicated by the probe.

Images