JPH0279529A - Power checker - Google Patents

Abstract

PURPOSE:To ensure power check even in a transmitter with small power by using a light emitting diode capable of light emitting even with a small power as a power sensor and weighting a resistance value to control the lighting of plural light emitting diodes. CONSTITUTION:A current limiting resistor acts so as to increase the resistance of a resistor 3a connecting to a red light emitting diode 41 and decrease the resistance of a resistor 3b connecting to a green light emitting diode 42. A high frequency power outputted from a transmission output terminal 2 of a transmitter 1 is consumed by current limiting resistors 3a, 3b and much high frequency current flows to the green light emitting diode 42 connecting to the current limiting resistor 3b with a low resistance and the light emitting diode is lit when the current reaches a trigger current of the light emitting diode. Thus, the green light emitting diode 42 is lit while the high frequency power is low and the red light emitting diode 41 is also lit when the high frequency power is increase.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simple power checker for checking the transmission power of a transmitter.

, [Prior Art] Fig. 2 shows an example of a conventional device for measuring the transmission output of a transmitter, and is based on the document "Defense Agency Standard NDS C010".
4-Frequency Modulation Transmitter/Receiver Test Method" In the figure, 1 is a transmitter as a test device whose output is to be measured, 2 is a transmission output terminal of the test device 1, 31 is a pseudo load, and 5 is a high frequency ammeter.

Further, FIG. 3 shows a simple conventional device for checking the transmission output, and in the figure, 6 is a lamp.

Next, the operation will be explained.

In the measuring device shown in FIG. 2, the high frequency power output from the transmission output terminal 2 of the transmitter 1 is consumed by the pseudo load 31.

As a result, the high frequency current flowing through the pseudo load 31 is measured by the high frequency ammeter 5, and the transmission output of the transmitter 1 can be calculated from this current and the resistance value of the pseudo load 31. In addition,
In this measurement, a termination type wattmeter in which the pseudo load 31 and the high frequency ammeter 5 are integrated may be used.

Furthermore, as mentioned above, Fig. 3 shows a conventional power checker that was used when there was no need to know the absolute value of the transmission output, but only the presence or absence of the transmission output. Since the lamp 6 lights up as a result of the high-frequency power output from the output terminal 2 being consumed by the lamp 6, the presence or absence of the transmission output can be determined by whether or not the lamp 6 is lit.

[Problem to be solved by the invention]

Since the conventional power checker was constructed as shown in FIG. 3, it could not be used with a low-power transmitter because the lamp would not light up. Further, even if the lamp is lit, there are problems in that it is difficult to determine the magnitude of the transmission output because it is determined by the luminous intensity of the lamp.

This invention was made in order to solve the problems of the conventional ones as described above, and it is possible to know the presence or absence of the transmission output even in a low-power transmitter with an easy configuration.
To provide a power checker that can easily check the magnitude of transmission output as necessary.

[Means to solve the problem]

7. The power checker according to the present invention uses a light emitting diode and a current limiting resistor instead of the lamp conventionally used as a power sensor.

Further, the lighting of a plurality of light emitting diodes is controlled by weighting the series resistance values.

[Effect]

In this invention, the power check is performed by detecting the power (current) consumed by the resistor using the light emitting diode, which can be lit even with low power, so even if the transmitter uses low power, the power check can be performed reliably. can be done.

Furthermore, since the lighting of the plurality of light emitting diodes is controlled by weighting the series resistance values, the magnitude of the transmitted power can be easily confirmed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a power checker according to an embodiment of the present invention, in which 1 is a transmitter, 2 is a transmission output terminal of the transmitter, 3a and 3b are current limiting resistors, 41 is a red light emitting diode, and 42 is a green light emitting diode. It is a light emitting diode.

Next, the operation will be explained.

Assume that the current limiting resistor 3a connected to the red light emitting diode 41 has a high resistance value, and the current limiting resistor 3b connected to the green light emitting diode 42 has a low resistance value.

The high frequency power output from the transmission output terminal 2 of the transmitter 1 is consumed by the current limiting resistors 3a and 3b, and as a result, a high frequency current corresponding to the high frequency power is transmitted to the light emitting diode 41 or 4.
2, but a large amount of high frequency current flows toward the green light emitting diode 42 connected to the current limiting resistor 3b having a low resistance value, and when the current reaches a current that allows the light emitting diode to light up, the light emitting diode lights up.

As a result, the green light emitting diode 42 lights up while the high frequency power is low, and the red light emitting diode 41 lights up when the high frequency power increases.

In the above embodiment, two color light emitting diodes were used, but as shown in FIG. If the resistance values of 3f are ordered, a similar effect can be obtained and the transmission power can be measured more precisely.

Moreover, if it is sufficient to simply detect the presence or absence of transmission power, a single light emitting diode 4 is connected to the current limiting resistor 3 as shown in FIG.
The presence or absence of transmission power from the transmitter 1 can be reliably detected even if the power is low, depending on whether or not the light emitting diode 4 is lit.

Furthermore, in the embodiment shown in Fig. 5, only an example in which a resistor was inserted in series with the light emitting diode was shown, but as shown in Fig. 6, by inserting current limiting resistors 3g and 3h in series and in parallel, Since the high frequency power is divided between the two resistors, it can also be used for power checks of large amounts of power.

〔Effect of the invention〕

As described above, according to the power checker of the present invention, a light emitting diode that can emit light even with low power is used as a power sensor, and the lighting of a plurality of light emitting diodes is controlled by weighting the resistance values. Even if the transmitter under test has low power, it is possible to measure the presence or absence of transmission output and the magnitude of transmission output with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram showing a power checker according to an embodiment of the present invention, Fig. 2 is a connection diagram showing an example of a conventional device for measuring the transmission power of a transmitter, and Fig. 3 shows a conventional simple power checker. 4, 5, and 6 are diagrams showing other embodiments of the present invention. In the figure, ■ is the transmitter, 2 is the transmission output terminal, and 3.3a
~3h is a current limiting resistor, 5 is a high frequency ammeter, 6 is a lamp, 31 is a pseudo load, 4.43 to 46 are light emitting diodes,
41 is a red light emitting diode, and 42 is a green light emitting diode. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A power checker for checking the transmission output of a transmitter, comprising a single light emitting diode that lights up with the transmission output, and indicating the presence or absence of the transmission output by whether or not the light emitting diode is lit. power checker. (2) A power checker for checking the transmission output of a transmitter, which includes a plurality of light emitting diodes that light up depending on the transmission output, each having a weighted resistance value, and detecting the above according to the magnitude of the transmission output of the transmitter. A power checker comprising a plurality of resistors that control lighting of a plurality of light emitting diodes, and displaying the magnitude of a transmission output depending on the lighting status of the plurality of light emitting diodes.