JPS63193067A - Contact recognition apparatus - Google Patents

Abstract

PURPOSE:To easily and certainly discriminate the contact state of a measuring terminal and an object to be inspected, by applying a high frequency signal to the measuring terminal brought into contact with the object to be inspected through a condenser and detecting the signal voltage of the voltage dividing ratio of the electrostatic capacity of the condenser and that of the object to be inspected. CONSTITUTION:This apparatus consists of a high frequency generator 1, the measuring terminal 3 connected to the output terminal of the high frequency generator 1 through a condenser 2 and brought into contact with an object 7 to be inspected and the detection part 4 connected to the measuring terminal 3 through a condenser 5 having the almost same electrostatic capacity as the condenser 2 and detecting the signal voltage divided on the basis of the ratio of the electrostatic capacity of the condenser 2 and that of the object to be inspected. Then, a high frequency signal is applied to the object 7 to be inspected through the condenser 2 and the signal voltage of the voltage dividing ratio of the electrostatic capacity of the condenser 2 and that of the object 7 to be inspected is detected by the detection part 4; and, by detecting the presence of said signal voltage, it is discriminated whether the measuring terminal 3 is accurately brought into contact with the object 7 to be inspected.

Description

[Detailed Description of the Invention] [Industrial Application Field] When confirming a subject using a measurement terminal, the present invention determines whether the measurement terminal is in proper contact with the subject or in pseudo-contact. Regarding a contact confirmation device.

[Prior Art] For example, when measuring the current flowing through a test object or checking whether a voltage is applied, a measuring terminal is brought into contact with the test object and an indicator or other indicator is used. Measurements and confirmations are being carried out using this method. To explain this using an example of using a voltage detector, for example, 154 KV to 27
When determining whether a 5KV power transmission line is live or non-live, a measurement terminal is provided at the tip of a long insulated rod, the measurement terminal is brought into direct contact with the subject, and a signal is sent to one end of the insulated rod on the operating side. This signal was used to check the condition of the object and determine whether it was a live wire or a non-live wire.

[Problems to be solved by the invention] Generally, when a high voltage is applied to the test object, it is easy to check whether there is contact between the test object and the measurement terminal. If the voltage is low, or if the surface of the test object is oxidized or contaminated with oil, and the contact with the measurement terminal is not correct, resulting in false contact, it will be difficult to confirm the presence or absence of such contact. Reliability of contact confirmation decreases.

Therefore, if a high voltage is actually being applied to the test object but the measurement terminal is not in proper contact with the test object, the voltage etc. will not be displayed on the display section, so it will be determined that the wire is not live and correct measurement will not be possible.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a contact confirmation device that can easily and reliably determine the contact state between a measurement terminal and a subject.

[Means for Solving the Problems] A contact confirmation device according to the present invention includes a high-frequency generator, and a measurement terminal that is connected to the output terminal of the high-frequency generator via a first capacitor and that is brought into contact with a subject. and is connected to this measurement terminal via a second capacitor having approximately the same capacitance as the first capacitor, and is divided by the ratio of the capacitance of the first capacitor to the capacitance of the test object. The device is characterized in that it is equipped with a detection section that detects the applied signal voltage, and a high-frequency signal is applied to the measurement terminal in contact with the test object via the first capacitor, and the first capacitor and the static signal voltage of the test object are connected to each other. The contact state can be confirmed by detecting the signal voltage divided by the ratio of the capacitance.

[Operation] According to the present invention, a high frequency signal is applied to the test object via the first capacitor, a signal voltage of the voltage division ratio of the first capacitor and the capacitance of the test object is detected, and the signal voltage of this signal voltage is By detecting the presence or absence, it is determined whether or not the measurement terminal is properly in contact with the test object, and when the contact is normal, the test object is measured with a measuring device connected via the measurement terminal. The state of contact between the measurement terminal and the test object can be easily and reliably confirmed, and the test object can be measured reliably.
This can prevent erroneous measurements due to non-contact, etc.

[Embodiment] The figure is a diagram showing the configuration of an embodiment of the present invention, where 1 indicates, for example, a frequency of I K Tlz to IOK Hz and a signal voltage of 100
2 is a first capacitor; 3 is a measurement terminal that is connected to the output terminal of the high frequency generator 1 via the first capacitor 2 and is in contact with the object 7; 4 is a measurement terminal 3; A signal connected to the first capacitor 2 via a second capacitor 5 having approximately the same capacitance as the first capacitor 2 and divided by the ratio of the capacitance of the first capacitor 2 to the capacitance of the test object 7. The detection unit 6 for detecting voltage is a measuring device, such as an indicator for measuring the voltage, current, resistance, etc. of the subject 7, or a display meter for simply checking the condition. Reference numeral 8 denotes a ground, to which each ground terminal of the high frequency generator 1, measuring device 6, and test object 7 is connected. 9 is a connection point between the measurement terminal 3 and the second capacitor 5.

To explain the operation of the embodiment of the present invention, the measurement terminal 3 comes into contact with one terminal of the subject 7 to be measured. The other terminal of the subject 7 is connected to ground 8 . A high frequency signal voltage is generated from a high frequency generator 1 and applied to an n1 constant terminal 3 via a first capacitor 2. As a result, the above signal voltage is applied to the test object 7, but in this case, if the measurement terminal 3 on the board is not in contact with the test object 7, the capacitance of the test object 7 will be the same as zero. Since the signal voltage generated from the high frequency generator 1 is detected as a signal voltage as it is by the detection unit 4 via the second capacitor 5, this ensures that the measurement terminal 3 and the object 7 are not in contact with each other. You can check it. At this time, the measuring device 6 connected to the measuring terminal 3 does not operate, so that erroneous measurements can be prevented.

Next, assuming that the measurement terminal 3 is in proper contact with the subject 7, the capacitance fit C3 of the subject 7 is added, so
The voltage division ratio with the capacitance C1 of the first capacitor 2, that is, C3
: The signal voltage is divided by the ratio of C1, and the first capacitor 2
The shared voltage becomes the voltage at the connection point 9 of the detection unit 4, and this voltage is detected as it is by the second capacitor 5, which has the same capacitance as the first capacitor 2, and is measured by detecting this voltage. It can be confirmed that the contact state between the terminal 3 and the subject 7 is good. If the measuring device 6 operates and measures at this time, the measurement by the measuring device 6 can be displayed correctly.

[Effects of the Invention] According to the present invention, a high-frequency signal voltage is applied to a test object via a capacitor by a measurement terminal, and the signal voltage is divided by the ratio of the capacitance of the test object and the capacitance of the capacitor. By detecting this divided signal voltage with the detection unit, it is possible to determine the presence or absence of contact extremely easily and reliably with high precision. Excellent effects such as being able to prevent this and protecting against dangers associated with erroneous confirmation can be achieved.

[Brief explanation of the drawing]

The figure is a diagram showing the configuration of an embodiment of the present invention. 1... High frequency generator, 2... First capacitor, 3
...Gl constant terminal, 4...detection section, 5...second capacitor, 7...test object.

Claims (1)

[Claims] A high frequency generator, a measurement terminal connected to the output terminal of the high frequency generator via a first capacitor and in contact with the test object, and a measurement terminal having approximately the same capacitance as the first capacitor. and a detection unit connected via a second capacitor and configured to detect a signal voltage divided by the ratio of the capacitance of the first capacitor to the capacitance of the subject. Characteristic contact confirmation device.