Test system

Abstract

To provide a test system which can surely cool a test target unit and can correctly execute the next test even if there are individual differences in test target units or if there are differences in the situations of running a test.SOLUTION: The test system includes: a temperature sensor 3 for measuring the temperature of a test target unit 2; and a cooling fan 4 for cooling the test target unit 2. A test controller 20 for controlling a test causes the cooling fan 4 to operate and monitors the temperature measured by the temperature sensor 3, and controls the operation of the cooling fan 4 so that the operation stops when the temperature measured by the temperature sensor 3 becomes a specific temperature after transmission by the test target unit 2 ends.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a test system for testing a device under test, and more particularly to a test system capable of appropriately cooling the device under test. [Background technology]

[0002] [Prior Art] 2. Description of the Related Art Test systems for automatically testing electronic devices installed in aircraft and the like include a system in which a control device (test controller) remotely controls a device under test using communications to perform the test.

[0003] In a conventional test system, a signal (test signal) is applied to the device under test, the output signal from the device under test is measured by a measuring instrument, and the device is judged to be normal or abnormal based on the data (test result). Furthermore, if a failure is determined, which of the multiple modules included in the device under test has failed is identified, and an operator adjusts, repairs, or replaces the failed module.

[0004] In addition, there is a test in which the device under test transmits using PTT (Push to Talk). When the device under test transmits, the temperature rises. To prevent equipment failure due to continuous transmission, the device under test is cooled before the next test. In conventional test systems, regardless of the type of device under test or the content of the test, the cooling time was uniformly three times the transmission time of the device under test before waiting for the next test to be performed.

[0005] Specifically, in the device under test, the time from the start of PTT (PTT ON) to the end of PTT (PTT OFF) was defined as the transmission time, and three times the transmission time was defined as the cooling time.

[0006] [Conventional cooling screen: Figure 6] An example of a display screen of a control device (test controller) in a conventional test system will be described with reference to Fig. 6. Fig. 6 is an explanatory diagram showing an example of a cooling screen in a conventional test system. As shown in Figure 6, in the cooling screen of the conventional test system, when the cooling time begins, the “Cooling” screen is displayed, along with the time of the previous transmission, the time required for cooling, the elapsed time, the remaining cooling time, and a bar graph showing the remaining time.

[0007] In the example of FIG. 6, the required cooling time (39 seconds) is three times the transmission time (13 seconds), and at that point in time, the elapsed cooling time is 11 seconds, leaving 28 seconds of cooling time remaining. In addition, depending on the test, if the transmission time is short and the device under test is not very hot, and the operator touches the surface of the device to check, etc., and it is determined that cooling is not necessary, the "Stop Cooling" button can be clicked to stop the cooling process and enable the next test to be performed even if the default cooling time has not elapsed. There is also a "Stop Measurement" button to stop the measurement.

[0008] [Conventional cooling process flow: Figure 7] The cooling process in the conventional test system will be described with reference to Fig. 7. Fig. 7 is a flow chart showing the cooling process in the conventional test system. In a conventional test system, when a test controller starts a test, it starts a cooling process and monitors whether or not PTT is ON (S21). If PTT is not ON (No), the process S21 is repeated. If PTT is ON (YES), it is determined that transmission has started and the current time is acquired as the transmission start time (S22).

[0009] Then, the test controller monitors whether or not the PTT is turned OFF (S23), and if the PTT is not turned OFF (No), repeats the process S23. If PTT is turned off (YES), the transmission is terminated and the current time is acquired as the transmission end time (S24).

[0010] Then, the controller calculates the transmission time (T) and the required cooling time (3T) from the transmission start time and transmission end time (S25), and displays a cooling-in-progress screen (S26). While the cooling in progress screen is displayed, the time elapsed since the start of cooling is counted, and the display of the elapsed time and remaining time is updated successively. If an instruction to stop cooling or measurement is input while the cooling in progress screen is displayed, the process proceeds to step S28.

[0011] The controller judges whether or not the required cooling time has elapsed (S27), and if not (No), returns to process S26 and continues to display the cooling screen. If the required cooling time has elapsed in process S27 (Yes), the cooling screen is closed (S28) and the process ends. This is how cooling is performed in conventional test systems.

[0012] [Cooling time table: Figure 8] However, in tests with long transmission times, the device under test becomes hotter, so if the cooling time is uniformly set to three times the transmission time, the device under test may not be cooled sufficiently, making it impossible to perform normal measurements. Therefore, some tests are provided with a table (cooling time table) that stores the required cooling time in advance, reflecting the transmission time for each test item in each test, so that sufficient cooling is achieved, and the cooling process is performed by referring to the table.

[0013] An example of a conventional cooling time table will be described with reference to Fig. 8. Fig. 8 is an explanatory diagram showing an example of a cooling time table. As shown in FIG. 8, the cooling time table stores test items and required cooling times for each device under test in association with each other. In the cooling time table, it is possible to set the cooling time in detail, for example, to set the cooling time longer when the transmission time is long, or shorter when the transmission time is short, rather than being limited to three times the transmission time.

[0014] However, since the cooling time table stores the required cooling time for each tester name (model, type, etc.), it is not possible to set the table taking into account individual differences in the tested device or the conditions under which the test is carried out (such as multiple consecutive measurements). For this reason, even if the cooling time table is used, it is not possible to ensure that sufficient cooling is always performed for all devices under test, regardless of the circumstances under which the test is being performed.

[0015] [Related Technology] As a related prior art, there is Japanese Patent No. 6165566 entitled "Winding temperature control device and control method" (Patent Document 1). Patent Document 1 discloses that in cooling control of a steel sheet, target coiling temperatures and intermediate temperatures are achieved, and the intermediate air-cooling time is controlled within a target range at each location in the longitudinal direction of the steel sheet, thereby improving the quality of the steel sheet. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] Patent No. 6165566 Summary of the Invention [Problem to be solved by the invention]

[0017] However, in conventional test systems, the cooling time was specified to be three times the transmission time, which meant that if the device under test became hotter during testing, it would not be cooled sufficiently, and accurate test results would not be obtained in the next test.

[0018] Furthermore, in conventional testing systems, even if cooling was performed based on a cooling time table, it was not possible to set a cooling time that reflected individual differences in the device under test or differences in the test implementation conditions, and there was a problem that sufficient cooling may not be performed.

[0019] Furthermore, Patent Document 1 does not describe a configuration in which the temperature of the device under test obtained by a temperature sensor is monitored, the cooling device continues to operate until the temperature of the device under test reaches a specific temperature, and the cooling device stops operating when the specific temperature is reached.

[0020] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a test system that can reliably cool the device under test and correctly perform the next test, even if there are individual differences in the device under test or differences in the test implementation conditions. [Means for solving the problem]

[0021] The present invention, which aims to solve the problems of the above-mentioned conventional examples, is a test system having a control device that performs testing by measuring the device under test using a measuring device, and includes a temperature measuring device that measures the temperature of the device under test, and a cooling device that cools the device under test. The control device operates the cooling device and monitors the temperature measured by the temperature measuring device, maintains cooling by the cooling device until the temperature measured by the temperature measuring device reaches a specific temperature after transmission from the device under test is completed, and controls the operation of the cooling device to stop when the measured temperature reaches the specific temperature.

[0022] In addition, in the above-mentioned test system, the present invention is characterized in that when the control device determines that the temperature measured by the temperature measuring device after the tested device has finished transmitting has become lower than the temperature at the start of transmission, it controls the cooling device to stop operation.

[0023] In addition, the present invention is characterized in that in the above-mentioned test system, when the control device determines that the temperature measured by the temperature measuring device after the tested device has finished transmitting has fallen below a specific set temperature that is set higher than the temperature at the start of transmission, it controls the cooling device to stop operation.

[0024] Furthermore, in the test system of the present invention, the control device starts the operation of the cooling device when the device under test starts or ends transmission.

[0025] Furthermore, in the test system according to the present invention, the control device displays a graph of the change in the measured temperature on the display screen. Effect of the Invention

[0026] According to the present invention, a test system having a control device that measures the device under test using a measuring device and performs testing, the control device has a temperature measuring device that measures the temperature of the device under test, and a cooling device that cools the device under test, and the control device operates the cooling device and monitors the temperature measured by the temperature measuring device, and maintains cooling by the cooling device until the temperature measured by the temperature measuring device after the device under test has finished transmitting reaches a specific temperature, and when the measured temperature reaches the specific temperature, controls the cooling device to stop operating.This test system efficiently cools the device under test through forced cooling by the cooling device, and even if there are individual differences in the device under test or differences in conditions when the test is performed, the device under test can be reliably cooled before the next test is performed, resulting in the effect of enabling correct measurements to be performed.

[0027] Furthermore, according to the present invention, the test system is configured such that when the control device determines that the temperature measured by the temperature measuring device after the device under test has finished transmitting has fallen below a specific set temperature which is set higher than the temperature at the start of transmission, it controls the cooling device to stop operating, thereby having the effect of shortening the cooling time and enabling the test to be performed efficiently.

[0028] Furthermore, according to the present invention, the control device is the above-mentioned test system which displays the progress of the measured temperature in a graph on the display screen, so that the operator can monitor the temperature of the device under test over time, and can easily visually recognize any abnormal temperature and take prompt action. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a schematic diagram of the present system. [Diagram 2] FIG. 2 is a schematic explanatory diagram showing an installation state of a device under test. [Diagram 3]FIG. 2 is an explanatory diagram showing a display example of a cooling screen (1) of the present system. [Figure 4] 4 is a flowchart of a cooling process in the present system. [Diagram 5] FIG. 13 is an explanatory diagram showing a display example of a cooling screen (2) of the present system. [Figure 6] FIG. 13 is an explanatory diagram showing an example of a cooling screen in a conventional testing system. [Figure 7] 1 is a flowchart showing a cooling process in a conventional test system. [Figure 8] FIG. 13 is an explanatory diagram illustrating an example of a cooling time table. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. [Outline of the embodiment] A test system (this system) according to an embodiment of the present invention has a temperature sensor that measures the temperature of the device under test and a cooling fan that cools the device under test, and a test controller that controls the test operates the cooling fan while monitoring the temperature measured by the temperature sensor, and continues to operate the cooling fan until the temperature measured by the temperature sensor after the device under test has finished transmitting reaches a specific temperature, and when the measured temperature reaches the specific temperature, controls the operation of the cooling fan to stop.The cooling fan is operated to efficiently cool the device through forced cooling, and regardless of individual differences in the device under test or differences in conditions when the test is performed, the next test can be performed after the device under test has been reliably cooled, allowing correct measurements to be performed.

[0031] This system will be described with reference to Figure 1. Figure 1 is a schematic diagram of the system. As shown in FIG. 1, a test system 1 is connected to a device under test (apparatus under test) 2 via a network, and performs various tests. The test system 1 includes a test controller 20, n measuring instruments 10-1, 10-2, ... to 10-n (sometimes referred to as measuring instruments 10) that perform various measurements, a switching unit 30, and, as features of this system, a temperature sensor 3 and a cooling fan 4.

[0032] In accordance with instructions from the test controller 20, the measuring devices 10-1, 10-2, ... to 10-n output test signals to the device under test 2 via the switching section 30, receive and measure output signals from the device under test 2, and output the measurement results to the test controller 20. The switching section 30 is connected to the test controller 20 via a switching section control line, and switches the measuring instrument 10 connected to the device under test 2 according to a switching control signal from the test controller 20 .

[0033] The test controller 20 is a computer that controls the entire test, and basically includes a control unit that performs processing, a storage unit that stores processing programs and data, and an interface unit that connects to a network, etc. The test controller 20 also includes a display unit and an input unit. The test controller 20 corresponds to the control device recited in the claims. The various processes described in the embodiments below are executed by the control unit starting up the processing programs stored in the storage unit. The storage unit also stores a measurement result file that stores the measurement results.

[0034] The test controller 20 is connected to the measuring instrument 10, the switching section 30, and the device under test 2 via a network. The test controller 20 is also connected to a database (not shown) that accumulates test results, and writes / reads data to / from the database.

[0035] Furthermore, the test controller 20 of this system controls the cooling process of the device under test 2, acquires and stores temperature information from the temperature sensor 3, displays a cooling screen on the display unit, and controls the on / off of the cooling fan 4. Also, the test controller 20, like the conventional method, prohibits the transition to the next test while the cooling screen is displayed (during the cooling period), and allows the transition to the next test when the cooling screen is closed. The cooling process in the test controller 20 will be described later.

[0036] The device under test 2 is, for example, an electronic device installed in an aircraft or the like, and is a device that is the subject of a test executed by the test system 1. The device under test 2 includes one or more devices, and each device includes multiple replaceable modules. The device under test 2 is connected to a test controller 20 via a network, and transmits and receives information required for testing. For example, the test controller 20 sets various data required for testing in the device under test 2, and the device under test 2 transmits a response.

[0037] The temperature sensor 3 is a temperature measuring device as recited in the claims, which is installed near the device under test 2, measures the surface temperature of the device under test 2, and transmits the measurement result as temperature information to the test controller 20. The temperature sensor 3 may be a thermistor, a semiconductor sensor, or an infrared camera (thermo camera). The temperature information measured by the temperature sensor 3 is stored in the test controller 20 in association with date and time information.

[0038] The cooling fan 4 is a cooling device as described in the claims, and is an air-cooling fan that is installed near the DUT 2 and blows air toward the DUT 2. The cooling fan 4 is installed facing an air intake, an exhaust, a high-temperature surface, etc., so as to efficiently cool the DUT 2 that becomes hot due to transmission operation. The cooling fan 4 is controlled to be turned on / off by the test controller 20. The control of the cooling fan 4 will be described later. In this system, the cooling fan 4 is provided to perform forced cooling, thereby shortening the cooling time of the device under test 2 compared to natural cooling, and improving the testing efficiency.

[0039] [Installation of the device under test: Figure 2] Next, the installation status of the device under test in this system will be explained using Fig. 2. Fig. 2 is a schematic explanatory diagram showing the installation status of the device under test. As shown in FIG. 2, in this system, the device under test 2 is mounted on a cart 5 with wheels, and further, a temperature sensor 3 and a cooling fan 4 are mounted in the vicinity of the device under test 2.

[0040] When conducting a test, the device under test 2 is loaded onto a cart 5 and carried close to a rack on which multiple measuring instruments 10 are installed, and the device under test 2 is connected to the switching unit 30 via a cable. In addition, the temperature sensor 3 and the cooling fan 4 are moved close to the device under test 2 and loaded there, and their positions and orientations are adjusted before being connected to the test controller 20. After installing each piece of equipment in this manner, testing begins.

[0041] [Outline of cooling operation in this system] An overview of the cooling operation in this system will now be described. In this system, the device under test 2 is efficiently cooled by the cooling fan 4, and when it is determined based on temperature information from the temperature sensor 3 that the temperature of the device under test 2 has returned to the same level as when transmission began, it is ready to move on to the next test, indicating that cooling is complete.

[0042] Specifically, the test controller 20 retains the temperature at the start of transmission from the device under test 2, and when the device under test 2 finishes transmission, turns on the cooling fan 4 to start operation, and during cooling, displays the temperature information sequentially input from the temperature sensor 3 on the cooling screen. When the temperature of the device under test 2 drops below the temperature at the start of transmission, the cooling fan 4 is stopped and the cooling screen is closed, making it possible to carry out the next test.

[0043] In this way, in this system, the cooling period of the device under test 2 is not simply controlled by the cooling time, but is determined based on the actual temperature of the device under test 2. Therefore, even if there are individual differences in the device under test 2 and variations in the test implementation conditions, it is possible to clearly determine whether or not the device under test 2 has cooled to the same extent as when transmission began, depending on the condition of each device under test 2, and the next test can be performed correctly.

[0044] The temperature sensor 3 may be turned ON by the test controller 20 or an operator at the start of the test, periodically acquires the temperature and transmits the temperature information to the test controller 20, and may be turned OFF when cooling is completed or may be kept ON at all times. Here, it is assumed that the temperature sensor 3 is always ON. Also, the cooling fan 4 may start operating when transmission starts. By cooling the device under test 2 even during transmission, the temperature rise of the device under test 2 is kept low and the cooling time is shortened.

[0045] [Screenshot of this system during cooling (1): Figure 3] The cooling screen (1) of the present system will be described with reference to Fig. 3. Fig. 3 is an explanatory diagram showing a display example of the cooling screen (1) of the present system. The cooling screen (1), as in the conventional case, is a screen that displays the cooling status during the cooling time after the device under test 2 performs a transmission operation during a test, and is closed by control of the test controller 20 when the device under test 2 has cooled sufficiently and is ready to move on to the next test.

[0046] As shown in FIG. 3, the cooling screen (1) of this system displays the temperature of the device under test 2 at the start of transmission (PTT ON), the temperature at the end of transmission (PTT OFF), and the current temperature input from the temperature sensor 3. The cooling status can be easily checked visually using the cooling screen (1).

[0047] As in the past, the cooling screen (1) also has a "Stop Cooling" button for stopping cooling at the operator's discretion, and a "Stop Measurement" button for stopping measurement. When the operator decides to stop cooling, he or she can do so after checking the surface temperature of the device under test 2, making it less likely that the operator will make an erroneous decision.

[0048] [Cooling process flow: Figure 4] Next, the cooling process in this system will be described with reference to Fig. 4. Fig. 4 is a flowchart of the cooling process in this system. 4, the test controller 20 of this system starts a cooling process at the start of the test, and monitors whether the PTT of the device under test 2 is ON during the test (S1). If the PTT is not ON (No), the process returns to step S1 and continues monitoring. When the PTT is turned ON (Yes), the test controller 20 obtains the transmission start time, and obtains and stores the current temperature from the temperature sensor 3 as the temperature at the time of the transmission start (S2).

[0049] Then, the test controller 20 monitors whether the device under test 2 has been turned off (S3), and if the device under test 2 has not been turned off (No), the test controller 20 returns to S3 and continues monitoring. When the PTT is turned off (YES), the test controller 20 acquires the transmission end time and also acquires and stores the current temperature from the temperature sensor 3 as the temperature at the time of transmission end (S4).

[0050] When the transmission operation is completed, the test controller 20 turns on the cooling fan 4 (S5) and starts forced cooling as a cooling period for the next test. Then, the current temperature is acquired (S6), and a cooling screen is displayed (S7). Here, the cooling screen (1) shown in FIG. The cooling screen (1) displays the temperature when the PTT is ON, the temperature when the PTT is OFF, and the current temperature.

[0051] Then, the test controller 20 judges whether the current temperature has become lower than the temperature at the start of transmission (the temperature when PTT is ON) (S8), and if not (No), returns to S6 to obtain the current temperature and updates the display on the cooling screen. Although not shown, if the cooling stop button or the measurement stop button is clicked while the cooling screen is displayed, the process proceeds to step S9.

[0052] In step S8, if the current temperature is equal to or lower than the temperature at the start of transmission (Yes), the test controller 20 turns off the cooling fan 4 (S9), ends the forced cooling, closes the cooling screen (S10), and ends the cooling process. When the cooling screen closes, the next test can be performed. In this manner, the cooling process of the system is carried out.

[0053] [Screenshot of this system during cooling (2): Figure 5] Next, the cooling screen (2) of the present system will be described with reference to Fig. 5. Fig. 5 is an explanatory diagram showing a display example of the cooling screen (2) of the present system. The cooling screen (2) is a cooling screen that displays information based on temperature information acquired when the temperature sensor 3 is constantly ON.

[0054] As shown in Figure 5, the cooling screen (2) displays the temperature when the PTT is ON and when the PTT is OFF, just like the cooling screen (1), and also displays the current temperature in a time-series line graph. This makes it easier to visually grasp the temperature change. In the current temperature display area, the horizontal axis indicates time and the vertical axis indicates temperature, and auxiliary lines (vertical dashed lines in the example of FIG. 5) indicating the timing of PTT ON and the timing of PTT OFF are displayed.

[0055] Furthermore, the cooling screen (2) displays a temperature zone that indicates that the DUT 2 has been sufficiently cooled, that is, an area below the temperature at the start of transmission (when PTT is ON), in a colored zone. In the example of Fig. 5, for ease of viewing, the temperature at PTT ON is shown by a dotted horizontal line, and the area below the dotted line is a colored zone. Cooling ends when the current temperature shown on the line graph enters the colored band area.

[0056] The cooling screen (2) can display not only the temperature change after the end of the transmission operation, but also the temperature change before and during the transmission operation. If the temperature of the tested device 2 suddenly becomes hot during a transmission operation, or the temperature does not drop after the transmission ends, the operator can visually recognize the abnormality and take prompt action.

[0057] In this system, the operator selects either the cooling screen (1) or the cooling screen (2), and the test controller 20 displays the selected cooling screen on the display unit. Alternatively, both the cooling screen (1) and the cooling screen (2) may be displayed during cooling. Furthermore, the line graph of the current temperature on the cooling screen (2) may be displayed at all times, not just during cooling.

[0058] [Cooling end judgment threshold] The decision to end cooling, shown in process 8 of FIG. 4, is not limited to when the temperature of the device under test 2 drops below the temperature at the start of transmission. Cooling may be ended at a temperature higher than the temperature at the start of transmission as long as it is within the temperature range where correct measurement can be performed in the next test. Specifically, the test controller 20 may store a specific temperature (set temperature: T0+X) set by adding a preset value (addition value: X) to the temperature at the start of transmission (T0), and use the set temperature (T0+X) as a criterion (threshold value) for determining whether to end cooling. The addition value (X) is a value determined based on experiments, simulations, and past measurement results so that the set temperature is a temperature at which accurate measurement can be performed.

[0059] As a result, even if the temperature of the device under test 2 does not drop to the temperature before transmission begins, cooling is considered complete and the test can proceed to the next test once it falls below the set temperature (T0+X), shortening the cooling time and enabling the test to be carried out efficiently. The additional value (X) can be changed and set according to the type of the device under test 2.

[0060] Alternatively, the threshold value may be set regardless of the temperature of the device under test 2 before it starts transmitting. For example, the test controller 20 may determine in advance a temperature range in which the test can be performed correctly based on experiments or past test data, and may determine the end of cooling using the upper limit (TU) of that temperature range as a threshold value. When the threshold value (TU) is higher than the temperature at the start of transmission, the cooling time can be shortened and the efficiency of the test can be improved. This threshold value (TU) can also be changed and set according to the type of the device under test 2.

[0061] [Effects of the embodiment] This system has a temperature sensor 3 for measuring the temperature of the device under test 2 and a cooling fan 4 for cooling the device under test 2, and the test controller 20 operates the cooling fan 4 while monitoring the temperature measured by the temperature sensor 3, and continues (maintains) operation of the cooling fan until the temperature measured by the temperature sensor 3 after the device under test 2 has finished transmitting falls below the temperature at the start of transmission, and when the temperature falls below the temperature at the start of transmission, controls to stop operation of the cooling fan 4. This has the effect of allowing efficient cooling by the cooling fan 4, and allowing the device under test 2 to be reliably cooled before the next test can be performed regardless of individual differences in the device under test 2 or differences in conditions when the test is performed, thereby enabling correct measurement to be performed.

[0062] In addition, according to this system, the test controller 20 sets the threshold value for determining whether to end cooling to a temperature higher than the temperature at the start of transmission, thereby reducing the cooling time of the device under test 2 and improving the efficiency of the test.

[0063] Furthermore, according to this system, the test controller 20 displays the temperature information of the device under test 2 as a cooling screen (2) that displays a line graph including the temperature before and during transmission. This has the effect of enabling the temperature state of the device under test 2 to be displayed in detail, and enabling the operator to visually recognize any abnormal temperature changes and take prompt action. [Industrial Applicability]

[0064] The present invention is suitable for a test system that can reliably cool the device under test and correctly perform the next test even if there are individual differences between the device under test and differences in the test implementation conditions. [Explanation of symbols]

[0065] REFERENCE SIGNS LIST 1... test system, 2... device under test, 3... temperature sensor, 4... cooling fan, 5... dolly, 10... measuring instrument, 20... test controller, 30... switching unit

Claims

1. A test system having a control device that performs a test by measuring a device under test using a measuring device, a temperature measuring device for measuring the temperature of the device under test; a cooling device for cooling the device under test, The control device operates the cooling device while monitoring the temperature measured by the temperature measuring device, maintains cooling by the cooling device until the temperature measured by the temperature measuring device reaches a specific temperature after transmission from the device under test is completed, and controls the operation of the cooling device to stop when the measured temperature reaches the specific temperature.

2. The test system according to claim 1, characterized in that the control device controls the operation of the cooling device to stop when it determines that the temperature measured by the temperature measuring device after the test device has finished transmitting has become lower than the temperature at the start of transmission.

3. The test system described in claim 1, characterized in that the control device controls the operation of the cooling device to stop when it determines that the temperature measured by the temperature measuring device after the test device has finished transmitting has fallen below a specific set temperature that is set higher than the temperature at the start of transmission.

4. 4. The test system according to claim 1, wherein the control device starts the operation of the cooling device when the device under test starts or ends transmission.

5. 4. The test system according to claim 1, wherein the control device displays a graph of the change in the measured temperature on a display screen.

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