JPH09281174A - Thunder surge simulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively conduct the connection of a short-circuit bar without failure by removing sense of fear from worker and improving the actual safety. SOLUTION: The thunder surge simulator has a short-circuit bar 6 for switching the waveform of a surge voltage or current to be applied to a testpiece. The simulator is also provided with knobs 17b, 23b of terminals 17, 23 connected to both ends of the bar, and knob 6a of the bar 6 to protrude out of transparent plates 14, 15 at a fixed part, and the main body 6a of a short bar 6 and the main bodies 17a, 23a of the terminal 17, 23 are in the plates 14, 15. Further, the simulator is also provided with a switching setter for setting testing conditions, and a guide display unit 16 disposed at the switching destination position of the bar 6 to light and display the unit 16 of the position coincident with the set state of the setter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning surge simulator for artificially generating a surge voltage or the like in order to confirm breakdown (dielectric breakdown) of electronic equipment or electrical equipment against surge voltage or current. is there.

[0002]

2. Description of the Related Art In recent years, with the progress of electronic technology, electronic devices such as communication devices and control devices and electric equipment have been reduced in size and the packaging density has been improved. Noise, especially sudden surges, is great for electronic equipment and electrical equipment that has been refined in this way, leading to damage such as malfunction, failure, and destruction of the electronic equipment and electrical equipment. Here, the surge means a voltage or a current which fluctuates rapidly in a short time, such as lightning, and means a transient and non-reproducible one.

A typical example of such a surge is a discharge phenomenon 8 that occurs when lightning or static electricity charged on the human body comes into contact with electronic equipment or electrical equipment. In particular, when a surge of high power or large current such as lightning flows into a power supply line or the like, there is a high risk that electronic devices and electrical equipment will break down (dielectric breakdown) and be destroyed. For this reason, it is important to take circuit measures to prevent damage to the electronic device due to such surges. As a countermeasure against such a circuit, an artificially generated surge voltage or surge current is applied to an electronic device or electric equipment, and its influence, particularly, a breakdown state is examined in detail.

FIG. 8 shows a basic circuit of a lightning surge simulator which has been conventionally used (Japanese Patent Laid-Open No. 2-29).
197, etc.). This lightning surge simulator
The surge voltage or surge current generated by the surge generation circuit 55 is supplied to the test target circuit 56.
The resistors RO, RP, RI are connected between the two circuits 55, 56.
The voltage V and the current I for detection are taken out from this connection portion.

As a lightning surge simulator having such a circuit, one configured as shown in FIG. 9 is known. That is, the surge generation circuit 55 enters the lightning surge tester 61 that serves as a lightning surge simulator, and the test target circuit 56 enters the device under test 62. Electric power is externally supplied to the lightning surge tester 61 via a cable 63. On the other hand, this lightning surge tester 6
In the case of performing the communication line entanglement test by 1, the surge voltage or the surge current is supplied from the lightning surge tester 61 to the test target circuit 52 of the device under test 62 via the communication line 64. Then, the voltage V for detection and the current I for detection are taken out and processed by the lightning surge tester 61. In addition,
An AC cable 65 is connected to the DUT 62, and a line output cable 66 is connected from the lightning surge tester 61.
Has been taken out. A ground wire 68 is connected and grounded between the lightning surge tester 61 and the ground plate 67 on which the DUT 62 is placed.

The lightning surge tester 61 is provided with a switching section 69 having a plurality of short bars 70 for switching output waveforms and the like. As shown in FIGS. 10 and 11, the switching section 69 has a plurality of short bars 70 having notches 71 at both ends connected to a terminal 72. When the short bar 70 is switched, the knobs 73, 73 at both ends of the terminal 72 to which the short bar 70 is connected are loosened so that the short bar 70 can be removed. After that, the knob 74 of the short bar 70
Then, the short bar 70 is removed and locked to another terminal 72. The short bar 70 is switched by tightening the knob 73 of the terminal and connecting and fixing the short bar 70.

When the door 75 is closed after this switching is completed, the switch 77 is pushed through the switch operating body 76. A surge voltage or a surge current can be applied by the operation of the switch 77. Thus, the switch 77 is a safety switch that prevents the surge voltage and the surge current from turning on when the door 75 is open.

Most of such lightning surge simulators output an output waveform whose standard is determined by IEC (International Electrotechnical Commission). For example, the voltage waveform applied to the power supply line is, as shown in FIG. 12, 1. of the time T from the value of 30% to the value of 90% of the peak value.
67 times the time T1 is 1.2 μs, and the time T2 from the start of rising to the value 50% of the peak value is 50.
It is specified to be μs. When applied to the communication line, the voltage waveform quoted by CCITT (International Telegraph and Telephone Consultative Committee) is output. In this voltage waveform, the time T1 is 10 μs and the time T2 is 700 μs. As described above, the general lightning surge simulator has a short bar 7 so that various voltage waveforms can be obtained and various test methods can be adopted.
It is possible to switch 0.

[0009]

In the conventional lightning surge simulator, the safety is secured by the switch 77, but when the door 75 is opened, the short bar 70 is exposed, which is extremely difficult for the user. It has become a fear. In particular, for those who have used this lightning surge simulator, they experience a very loud electrical connection sound when the voltage is applied, so they rather feel the fear of the exposed short bar 70. Become.

Depending on the test conditions, the short bar 7
The connection relation of 0 is specified, but for those who are not used to it, they do not know how to connect.
Therefore, the wrong connection is made or the wrong operation is performed.

In addition, in the conventional lightning surge simulator, the switching work of the connection of the short bar 70 is unexpectedly time-consuming. That is, since the connection relationship is not known, the manual or the like is used each time to perform the work. Moreover, when the knobs 73 of the terminals 72 on both ends of the short bar 70 are loosened, the knobs 74 of the short bar 70 must be firmly held so that the short bar 70 does not fall. In addition, even if it is known that the voltage is not applied to the short bar 70, work is performed so as not to touch the main body portion of the short bar 70 as much as possible due to fear. For this reason, it takes a lot of time to switch the short bar 70.

An object of the present invention is to provide a lightning surge simulator capable of removing fear from an operator and improving actual safety. It is another object of the present invention to provide a lightning surge simulator which can surely connect the short bar without mistake.

[0013]

In order to achieve the above object, the invention according to claim 1 provides a lightning surge simulator having a short bar for switching a waveform of a surge voltage or a surge current applied to a device under test. The knob part of the terminal, to which both ends of the short bar are connected, and the knob part of the short bar are projected to the outside of the transparent plate provided in the fixed part, and the main body of the short bar and the main body of the terminal are It is provided inward.

According to the second aspect of the present invention, in the lightning surge simulator having a short bar for switching the waveform of the surge voltage or the surge current applied to the DUT, a switching setting section for setting the test condition and a short circuit are provided. Provided with a guide display section arranged at each switching destination position of the bar,
The guidance display unit at the switching destination position that matches the setting state of the switching setting unit is lit and displayed.

Further, in the invention according to claim 3, in a lightning surge simulator having a short bar for switching a waveform of a surge voltage or a surge current applied to a device under test, a door for covering a switching work portion for switching the short bar is provided. Provided with a transparent plate that is fixed inside the door and covers the short bar, a switching setting unit that sets the test conditions, and a guide display unit that is arranged at each switching destination position of the short bar. The knob part of the terminal and the knob part of the short bar to which are respectively connected are projected to the outside of the transparent plate, the main body of the short bar, the terminal body and the guide display part are provided inside the transparent plate, and the switching setting part The guide display part at the switching destination position that matches the setting state is lit and displayed, and the short bar can be switched from the outside of the transparent plate based on the display. Unishi to have.

According to the invention described in claim 4, in the lightning surge simulator according to claim 1, 2 or 3,
The transparent plate is made of acrylic, and the transparent plate is provided with an elongated hole for moving the knob portion of the short bar. Furthermore, in the invention according to claim 5, in the lightning surge simulator according to claim 4, the elongated hole is a circumferential elongated hole centered on one end of the short bar, and the short bar is centered on one end thereof. It is rotatable. In addition, in the invention according to claim 6, in the lightning surge simulator according to claim 5, one end of the short bar has a long hole and the other end has a U-shaped notch, and the knob of the terminal is engaged with each of them. ing.

In the invention according to claim 7, the invention according to claim 2
Alternatively, in the lightning surge simulator described in 3, the guidance display unit is lit up until the short bar is connected to the switching destination position, and continuously lit after being connected to the switching destination position. Further, in the invention according to claim 8, in the lightning surge simulator according to claim 2, 3 or 7, until the short bar is connected to the switching destination position where the lighting is displayed, the surge voltage or the surge voltage is applied to the device under test. Prevents surge current from being applied. Further, in the invention according to claim 9, claims 1, 2, 3, 4,
In the lightning surge simulator described in 5, 6, 7 or 8, the main body of the short bar is covered with an insulating member.

The lightning surge simulator of the present invention can switch the waveform of the surge voltage applied to the power source line of the device under test or the like. And this switching, the short bar whose both ends are connected to the terminal,
It is done by switching to a different terminal and connecting. The body of the short bar is arranged inside the transparent plate, and the knob portion protrudes outward, which reduces the fear of the operator when holding the knob portion. You can do it without fear.

Further, when performing the work, if the test condition is set by the switching setting section, the guide display section at the switching destination position of the short bar to be switched on is turned on. Therefore, the correct connection state can be easily obtained by switching the short bar according to the illuminated place.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The lightning surge simulator 1 is entirely box-shaped as shown in FIG. A device display unit 4 on which a voltage display unit 2 for displaying the magnitude of the applied voltage, an emergency stop button 3 and the like are arranged is arranged above the device display unit 4, and below the device display unit 4 for switching the waveform of the surge voltage. The switching setting unit 5 is arranged, and two switching working units 7 and 8 for switching the connection of the short bar 6 are arranged below the switching setting unit 5.

The switching setting section 5 includes a waveform selection button 9 for switching voltage waveforms, a superimposition selection button 10 for selecting a superimposition method when superimposing a surge voltage or a surge current, and a line selection switch 11 for selecting a superimposition line. Etc.

The switching work parts 7, 8 are provided with doors 12, 13 made of smoke-colored acrylic, and are in a closed state when the switching work is not performed. Then, a switch 33 similar to the switch 77 shown in FIG. 11 which operates by opening and closing the doors 12 and 13 is provided, respectively, to enhance the safety of work.

When the door 12 of the upper switching work unit 7 is opened,
A plurality of short bars 6 arranged as shown in FIG. 2 are arranged inside an acrylic transparent plate 14. The upper three short bars 6 are for switching the waveform, and the lower two short bars 6 are for switching the superimposing method. On the other hand, the door 1 of the lower switching work unit 8
When 3 is opened, the two short bars 6 arranged as shown in FIG. 3 are arranged inside the acrylic transparent plate 15.
Here, the two short bars 6 are for switching the overlapping lines.

As shown in FIGS. 2 to 4, a plurality of short bars 6 are provided in each of the switching work sections 7 and 8, and a guide display section is provided at the tip of each short bar 6 at each switching destination position. The LED display unit 16 is connected to one end of the short bar 6, and the terminal 17 is disposed below the LED display unit 16.
And a position detector 18 having a light emitting element and a light receiving element disposed below the position detector. In addition, LED
In the display unit 16, the switching destination position is connected by a line as shown in FIG. 2 so that the combination under the specific test condition can be easily understood. The LED display section 16 connected by a line has the same display color and a different display color from the LED display section 16 connected by another line.

The three short bars 6 on the upper side of the switching work section 7 can be selectively switched. For this switching, the transparent plate 14 is provided with a fan-shaped alternative long hole 19 in which the knob portion 6b of the short bar 6 is movable. Further, the two short bars 6 on the lower side of the switching work unit 7 can be switched to one of three alternatives. For this switching, the transparent plate 14 is provided with fan-shaped three-choice elongated holes 20. Further, on the transparent plate 15 of the switching work unit 8,
A 6-choice slot 21 for switching between the two short bars 6 in a 6-choice, and a 7-choice for switching between the 7 short cuts.
Optional slot 22 is provided.

The other end of each short bar 6 serves as a rotation fulcrum of the short bar 6 and a rotation fulcrum terminal 2
3 respectively. Below the switching work unit 8, a plurality of external connection terminals 24 for connecting to an external device are provided, and an AC power supply unit 25 of 100 to 120 V and an AC power supply unit 26 of 200 to 240 V are provided. Has been. And each external connection terminal 24
An LED display unit 27 is provided near each of the AC power supply units 25 and 26.

FIG. 5 shows an outline of the cross-sectional structure of the portion of each switching work portion 7, 8 where the short bar 6 is provided. That is, the transparent plates 14 and 15 made of transparent acrylic are arranged inside the doors 12 and 13, and the fixing plates 30 to which the main bodies 17a and 23a of the terminals 17 and 23 are fixed are provided inside thereof. ing. The body 6 a of the short bar 6 is arranged between the transparent plates 14 and 15 and the fixed plate 30. Therefore, when the doors 12 and 13 are opened, the main body 6a of the short bar 6 cannot be touched from the outside. That is, the worker can touch only the knob portion 17b of the terminal 17, the knob portion 6b of the short bar 6, and the knob portion 23b of the rotation fulcrum terminal 23 when performing the switching work of the short bar 6. There is. The transparent plates 14 and 15 and the fixed plate 30 are fixed to the fixed portion of the lightning surge simulator 1, respectively.

The LED display section 16 includes a light emitting diode 3
1 is arranged, and the position detector 18 is provided with a position detector including a light emitting element 32a and a light receiving element 32b. The position detector projects from the fixing plate 30 so that the light emitting element 32a and the light receiving element 32b face each other.
The light shielding plate 6e of the short bar 6 can be inserted into the space 32c between them. The light emitting element 32a and the light receiving element 32b are solidified with a protective material such as transparent silicon so as not to be affected by the spark generated from the short bar 6. On the other hand, the light-shielding plate 6e is made of an insulating material such as a resin material to increase the insulation distance between the short bar 6 and the light emitting element 32a and the light receiving element 32b. Further, each switching work unit 7, 8 has a door 12,
A door switch 33 is provided for operating the opening / closing operation of 13 so that the surge voltage and the surge current cannot be applied to the DUT 41 unless both doors 12 and 13 are closed. It should be noted that each switch 33 is operated via the switch operation body 34.

As shown in FIG. 6, the short bar 6 is composed of a main body 6a and a knob portion 6b. Further, one end that engages with the terminal 16 is a cutout portion 6c, and the other end that engages with the rotation fulcrum terminal 23 is an elongated hole 6d. Further, as described above, the light-shielding plate 6e made of resin that goes in and out of the space 32c of the light emitting element 32a and the light receiving element 32b is attached below the short bar 6.
The short bar 6 is further provided with an insulating tube 3
5 is fitted, which enhances safety both sensuously and practically.

The elongated holes 19, 20, 21, 22 for movably guiding the knob portion 6b of the short bar 6,
A circumferential guide hole 36 for guiding the movement of the short bar 6 and a locking hole 37 radially protruding from the guide hole 36 for locking the short bar 6 are provided. .

The outline of the circuit configuration of the lightning surge simulator 1 thus constructed is as shown in FIG. The device under test 41 is driven by the AC power supply 40. Then, a surge voltage or a surge current is applied to the lines of the AC cables 40a, 40a via the coupling circuit 51. The surge voltage and the surge current are supplied from the high-voltage power supply unit 42 through the switch 43 to the charging resistor RA and the charging capacitor 44 for charging, and then the switch 4
3, the switch 45 is closed while the switch 3 is opened, and the charged charge is discharged through the discharge resistor RB. A decoupling circuit 52 is arranged between the device under test 41 and the AC power supply 40 to prevent a surge voltage and a surge current from being applied to the AC power supply 40.

On the other hand, the switch 45 is operated by a relay coil 47 driven by a low voltage power supply section 46. This relay coil 47 is a transistor 48
Is controlled by the switch control unit 49 that operates the. Then, the switch control unit 49 receives the state signal of each switch 33 operated by each door 12 and 13, the state signal of the start button 1a, and the state signal of the position detection control unit 50 that detects the position of the short bar 6. Enter each switch 3
The signal for turning on the transistor 48 is issued only when 3 is closed and each short bar 6 is connected to the switching destination position that matches the test condition set by the switching setting unit 5.

The position detection control unit 50 receives the setting conditions of the switching setting unit 5 via the switch control unit 49,
It has a function of lighting or blinking each LED display unit 16 according to the condition. In addition, the position detection control unit 5
0 inputs the signal from the position detector 18, and the short bar 6
It is also for determining whether or not is held at the switching position. Further, when the short bar 6 reaches the set switching position, the position detection control unit 50 causes the light emitting diode 31 blinking at that position to be in the continuous lighting state. That is, the light emitting diode 3 of the LED display unit 16
1 is normally in a non-lighting state, and when it is set as the switching destination position of the short bar 6 by the switching setting unit 5, it is in a blinking state. When the short bar 6 is held at the switching position, the position detector of the position detector 18 detects the state, and the light emitting diode 31 is detected.
Becomes a continuous lighting state.

Next, the operation of the lightning surge simulator 1 configured as described above will be described.

In order to perform a destructive test of the DUT 41, first, the selection buttons 9, 10, 11 and the like of the switching setting section 5 of the lightning surge simulator 1 are pressed to set the test condition, that is, the switching destination condition of the short bar 6. Set. After that, or before performing the above work, the operator opens the doors 12 and 13.
Then, the switch 33 brings the lightning surge simulator 1 into a state where the surge voltage and the surge current cannot be applied to the DUT 41.

After this, the worker is allowed to use the LED display unit 16
The short bar 6 is switched to the switching destination position where is blinking. Further, the cable from the DUT 41 or the like is connected to the place where the LED display unit 27 is in the blinking state.

To switch the short bar 6, the knob 17b of the terminal 17 and the knob 23b of the turning fulcrum terminal 23 are first loosened. And short bar 6
With the knob portion 6b of each slot 1b
9, 20, 21, 22 locking portion hole 37 to guide portion hole 36
Move the short bar 6 to move to. At this time, the knob portion 17b of the terminal 17 relatively moves to the opening side in the cutout portion 6c of the short bar 6, while the knob portion 23b of the rotation fulcrum terminal 23 moves to the short bar 6 side.
The inside of the long hole 6d is relatively moved to the knob portion 6b side.

After that, holding the knob portion 6b of the short bar 6, the short bar 6 is rotated around the rotation fulcrum terminal 23 as a fulcrum, and is moved to the terminal 17 portion where the LED display section 16 is in a blinking state. At this time, the knob portion 6b of the short bar 6 has the long holes 19, 20, 2
It moves by being guided by the guide part holes 36 of 1 and 22. Then, the short bar 6 is moved so that the cutout portion 6c of the short bar 6 is deeply engaged with the knob portion 17b of the terminal 17. That is, the knob portion 6b of the short bar 6
Is moved from the guide hole 36 of each of the slots 19, 20, 21, 22 to the locking hole 37. After that, each terminal 1
7 and 23 knobs 17b and 23b to the terminals 1
Tighten the main body 17a, 23a of 7, 23. The main bodies 17a and 23a of the terminals 17 and 23 and the knob portions 17b and 23b are screw-engaged.

When the short bar 6 is brought to the set switching destination, the position detector 18 detects the state and sends the detection signal to the position detection controller 50. That is, when the light-shielding plate 6e of the short bar 6 enters the space 32c of the light emitting element 32a and the light receiving element 32b to block light, it is detected that the short bar 6 is held, and the detection signal is detected. Send to 50. Then, the position detection control unit 50
Changes the light emitting diode 37 from the blinking state to the continuous lighting state.

The lightning surge simulator 1 and the device under test 41 are connected to each other after or before the switching operation of the short bar 6. This connection is performed by connecting a cable or the like to a place where the LED display unit 27 is in a blinking state. When the line switch is turned on after the completion of each connection, each LED display unit 27 changes from the blinking state to the continuous lighting state. When all the short bars 6 are connected to the set switching destination positions and the cables or the like are correctly connected, that is, the LED display unit 1
When all the indications of 6,27 change from blinking to continuous lighting,
The position detection control unit 50 transmits a signal indicating that the setting is completed to the switch control unit 49.

After that, the doors 12 and 13 are closed. Then, a signal from each switch 33 is input to the switch control unit 49, and a surge voltage or a surge current can be applied to the DUT 41. Then press the start button 1a,
A surge test is performed on the device under test 41.

In the surge test, for example, the surge voltage shown in FIG. 12 is applied to the device under test 41 via the power supply line and the communication line. The applied voltage can be obtained by charging the charging capacitor 44 from the high voltage power supply unit 42 via the switch 43 and the charging resistor RA with the switch 43 closed and the switch 45 open. Then, when the start button 1a is pressed, the transistor 4
8 is turned on, the relay coil 47 is turned on, and the switch 45 is closed. As a result, the electric charge charged in the charging capacitor 44 is applied to the DUT 41 via the discharge resistor RB, the switch 45, the resistor RO, the coupling circuit 51 and the cable 40a.

When the device under test 41 breaks down, a kind of short circuit occurs, and the voltage output V and the current output I fluctuate. By detecting the fluctuation state, the dielectric breakdown of the DUT 41 is confirmed.

In the above-described embodiment, the LED display section 27 guides not only the switching destination position of the short bar 6 but also the connection relationship of the cable or the like connecting the DUT 41 and the lightning surge simulator 1. So all the settings are definitely done. Moreover, unless all the settings are completed, the lightning surge simulator 1
Since it does not generate a surge voltage or a surge current, it is preferable for safety. In addition,
If the generation of the surge voltage or the like can be performed at least when the switching of the short bar 6 is properly performed, it is possible to apply the voltage or the like in a state where the short bar 6 which is apt to make an error during the switching work is correctly set. As compared with the conventional case, the erroneous operation of applying a voltage or the like in the wrong state is reduced.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. is there. For example, since the position detection unit 18 is covered with the short bar 6,
Is not confirmed to have been switched to the correct position, but the signal of this position detection unit 18 and each terminal 1
It may be possible to confirm that the switching is correctly performed by an AND condition with a signal that detects that the locking at 7 and 23 is completely performed. In this case, for example, it is possible to employ means for confirming the entry state of each knob portion 17b, 23b into each main body 17a, 23a using light or electricity.

[0047]

As described above, claims 1 and 3
In the described lightning surge simulator, the main body of the short bar is located inside the transparent plate, so that the worker can perform switching work without feeling fear, and the actual safety is improved. . Further, in the lightning surge simulator according to the second and third aspects, if the worker performs the work based on the lighting state of the guide display portion provided at each switching destination position of each short bar, the worker surely connects the short bar. It will be possible. This eliminates all false connections and reduces test errors.

Further, in the lightning surge simulator according to claim 4, since the transparent plate is made of acrylic and the elongated hole for moving the knob portion of the short bar is provided in the transparent plate, it is possible to remove the knob portion from the short bar. The short bar can be moved inside the transparent plate. Therefore, the fear of the operator is further reduced and the safety is enhanced.

Further, in the invention according to claim 5, since the short bar can be brought to another switching destination position by rotating the short bar, the switching work efficiency is improved.
In addition, in the invention described in claim 6, the short bar can be switched between the locking position and the movable position by moving the short bar so-called back and forth, and the long hole of the short bar causes the short bar to function as a rotation fulcrum terminal. Since it is always engaged, the switching operation can be performed extremely easily and reliably.

Further, in the invention according to claim 7, the switching destination position can be surely recognized by the blinking display, and by switching from blinking to continuous lighting,
You can check the completion of work. Therefore, the work of switching the short bar can be performed more efficiently and reliably. In the invention according to claim 8, the surge voltage or the like can be applied only after all the short bars are correctly connected, so that the safety is improved. Also,
In the invention according to claim 9, since the main body of the short bar is covered with the insulating member, the fear of the operator is further reduced and the actual safety is further enhanced.

[Brief description of drawings]

FIG. 1 is an external front view of an embodiment of a lightning surge simulator of the present invention.

FIG. 2 is a diagram showing a state in which a door of an upper switching work unit of the lightning surge simulator of FIG. 1 is opened.

FIG. 3 is a diagram showing a state in which the door of the switching work unit below the lightning surge simulator of FIG. 1 is opened.

FIG. 4 is an enlarged view of a portion to which the short bar of the lightning surge simulator of FIG. 1 is attached, (A) is a diagram showing an alternative long hole portion, and (B) is a three alternative long hole portion. (C) is a figure which shows a 7-choice oblong hole part.

5 is a cross-sectional view of essential parts near the short bar of the lightning surge simulator of FIG.

6A and 6B are views showing a short bar used in the lightning surge simulator of FIG. 1, in which FIG. 6A is a plan view and FIG. 6B is a side view seen from the direction of arrow B in FIG.

FIG. 7 is a main part circuit diagram showing a main part of a circuit in the lightning surge simulator of FIG. 1.

FIG. 8 is a circuit diagram of a main part used in a conventional lightning surge simulator.

FIG. 9 is an explanatory diagram for explaining an appearance and a method of using a conventional lightning surge simulator.

FIG. 10 is a front view of a switching unit of the lightning surge simulator of FIG.

FIG. 11 is a cross-sectional view of essential parts near the short bar of the lightning surge simulator of FIG. 9.

FIG. 12 is a diagram showing voltage waveforms generated by the conventional and the present invention lightning surge simulators.

[Explanation of symbols]

 1 Lightning surge simulator 4 Equipment display section 5 Switching setting section 6 Short bar 6a Short bar body 6b Short bar knob section 6c Cutout section 6d Long hole 7,8 Switching work section 15 Transparent plate 16 LED display section (guidance display section) 17 Terminal 17a Terminal Main Body 17b Terminal Knob 18 Position Detector 19 2 Alternative Slot (Slot) 20 3 Alternative Slot (Slot) 21 6 Slot (Slot) 227 Choice Long hole (long hole) 23 Rotating fulcrum terminal (terminal) 23a Terminal body 23b Terminal knob 35 Tube (insulating member) 36 Guide hole 37 Locking hole 41 DUT

Claims (9)

[Claims] 1. A lightning surge simulator having a short bar for switching a waveform of a surge voltage or a surge current applied to a DUT, and a knob portion of a terminal to which both ends of the short bar are connected, and the short bar. A lightning surge simulator, characterized in that the knob portion of the short bar and the main body of the terminal are provided inside the transparent plate, and the main body of the short bar and the main body of the terminal are provided outside the transparent plate provided in the fixed portion. 2. A lightning surge simulator having a short bar for switching a waveform of a surge voltage or a surge current applied to a device under test, and a switching setting section for setting a test condition and a switching destination position of each of the short bars. A lightning surge simulator characterized in that a guide display section is provided, and the guide display section at the switching destination position that matches the setting state of the switching setting section is lit and displayed. 3. A door for covering a switching work portion for switching the short bar, which is placed in a lightning surge simulator portion having a short bar for switching a waveform of a surge voltage or a surge current applied to a DUT, and a door of this door. A transparent plate that is fixed inward and covers the short bar, a switching setting unit that sets the test conditions, and a guide display unit that is arranged at each switching destination position of the short bar are provided, and both ends of the short bar are provided. The knob portion of the terminal and the knob portion of the short bar, which are respectively connected, are projected to the outside of the transparent plate, and the main body of the short bar, the main body of the terminal, and the guide display portion are provided inside the transparent plate. , The guidance display unit at the switching destination position that matches the setting state of the switching setting unit is lit and displayed, and the switching of the short bar is performed based on the display. A lightning surge simulator characterized in that it can be performed from the outside of the transparent plate. 4. The lightning surge simulator according to claim 1, wherein the transparent plate is made of acrylic, and the transparent plate is provided with an elongated hole for moving the knob portion of the short bar. 5. The elongated hole is a circular elongated hole centered on one end of the short bar, and the short bar is rotatable about one end thereof. The lightning surge simulator described in 4. 6. The short bar has an elongated hole at one end and a U-shaped notch at the other end. The knobs of the terminals are engaged with the respective short holes, and the knob of the short bar is inserted into the elongated hole of the transparent plate. 6. A locking portion hole is provided to allow the portion to move in the opening direction of the cutout portion.
The described lightning surge simulator. 7. The lighting of the guide display unit is a blinking display until the short bar is connected to the switching destination position, and is continuously lit after being connected to the switching destination position. The lightning surge simulator according to claim 2 or 3. 8. The surge voltage or the surge current is not applied to the device under test until all of the short bars are connected to the switching destination positions where the lighting is displayed. Alternatively, the lightning surge simulator described in 7. 9. The main body of the short bar is covered with an insulating member.
The lightning surge simulator according to 6, 7, or 8.