JP5377938B2 - Measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a down converter apparatus in which a measuring instrument is caused to perform a frequency measurement of a high frequency signal without damaging portability of the measuring instrument. <P>SOLUTION: A down converter apparatus includes: a signal input connector 31 for inputting an input signal; a frequency dividing circuit 32 for frequency-dividing and outputting the input signal inputted via the signal input connector 31 in a predetermined frequency dividing ratio; and a pair of connecting plugs 35a, 35b configured to be connected to a pair of connecting jacks 11a, 11b provided in a measuring instrument body 2a (measuring instrument) for outputting the output signal of the frequency dividing circuit 32 to the measuring instrument body 2a via the pair of connecting jacks 11a, 11b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a measurement system having a downconverter equipment and measuring apparatus for outputting by dividing the input signal by a predetermined division ratio.

Nowadays, a highly-functional portable measuring device configured to be able to measure not only a voltage value, a current value, and a resistance value but also the frequency of a signal to be measured has been proposed. For example, Japanese Patent Application Laid-Open No. 11-344512 discloses a portable measuring device (digital multimeter) configured to be able to measure various parameters such as voltage value, current value, resistance value, frequency and temperature. Yes. This measuring device can be connected to an operation panel including a rotation function selection switch for selecting a parameter to be measured (selecting a measurement mode), an LCD display for displaying a measurement result, and a plug for connecting a measurement cable. A connection jack is provided on the main panel of the case (housing). In this measuring device, the rotation function selection switch is operated to select the frequency measurement mode, and the measurement cable plug is connected to the jack and brought into contact with the object to be measured for input via the measurement cable. The frequency of the measured signal to be measured is measured, and the measurement result (measurement frequency) is displayed on the LCD display.
JP-A-11-344512 (page 1-3, FIG. 1-2)

  However, the conventional measuring apparatus has the following problems. That is, the conventional measurement apparatus employs a configuration in which the frequency of the measurement target signal input via the measurement cable is measured and the measurement result (measurement frequency) is displayed on the LCD display. In this case, in the measurement device of the type that measures the electrical parameter by inputting the signal to be measured via the measurement cable connected to the jack (the measurement device that does not have the coaxial connector for high-frequency signal input), the above disclosure As shown in the display screen diagram illustrated in the drawing of the publication, generally, a signal having a relatively low frequency from several tens of Hz to several hundreds of kHz is designed as a measurement target. Therefore, conventional measurement devices cannot measure frequencies for high-frequency signals in the order of MHz or GHz. When measuring frequencies using these high-frequency signals as measurement target signals, the frequency of the high-frequency signals can be measured. There is a problem that the measurement must be performed by a special measuring device.

  On the other hand, by improving the conventional measurement device so that the frequency of the high-frequency signal can be measured, a dedicated measurement device can be eliminated. However, when the above improvements are made, it is necessary to arrange a coaxial connector (BNC connector, SMA connector, etc.) for high-frequency signal input in addition to the jack for connecting a measurement cable during normal measurement. Arise. In this case, the coaxial connector is generally configured to largely protrude from the case surface. For this reason, when the frequency of the high frequency signal is improved so as to be measurable, the apparatus (case) is increased in size due to the arrangement of the coaxial connector, and also due to the presence of the coaxial connector protruding greatly from the case surface. There is a problem that the portability at the time of measuring the voltage value or current value (during normal use without measuring the frequency of the high frequency signal) is significantly impaired.

The present invention, according view to the problems has been made, without impairing the portability of the measuring device, a main object of providing a constant system measurement that obtained by executing the measuring apparatus a frequency measurement of the high frequency signal To do.

In order to achieve the above object, a measurement system according to claim 1, a signal input connector for inputting a force signal, and the input signal input via the signal input connector are divided at a predetermined frequency division ratio. A frequency dividing circuit that circulates and outputs and a pair of connection jacks provided in the measuring device are configured to be connectable, and an output signal of the frequency dividing circuit is supplied to the measuring device via the pair of connecting jacks. A down-converter device including a pair of connection plugs for outputting; and the measurement device, wherein the down-converter device outputs frequency division ratio information indicating the predetermined frequency division ratio to the measurement device. A frequency division ratio information output unit, and the measurement device includes a measurement unit that measures the frequency of the measurement target signal, a display unit that displays a measurement frequency based on a measurement result by the measurement unit, and the measurement unit that performs the measurement. A control unit that controls measurement of the wave number and displays the measurement frequency on the display unit, and the control unit is configured to output the measurement result from the measurement unit and the frequency division ratio information output unit. Based on the ratio information, the frequency of the input signal is calculated and displayed on the display unit as the measurement frequency .

The measurement system of claim 2, in the measurement system of claim 1, wherein the downconverter device, dividing ratio setting to be set in the frequency divider circuit a desired frequency division ratio as the predetermined frequency division ratio And a frequency dividing circuit configured to divide the input signal by a frequency dividing ratio set by the frequency dividing ratio setting circuit.

2. The measurement system according to claim 1, wherein a signal input connector for inputting an input signal, and a frequency dividing circuit for dividing and outputting the input signal input via the signal input connector at a predetermined frequency dividing ratio. And a pair of connection plugs configured to be connectable to a pair of connection jacks provided in the measurement device and for outputting an output signal of the frequency dividing circuit to the measurement device via the pair of connection jacks. I have. Further, in this measurement system, the display unit includes a down converter device, and a measuring device, the measuring device displays a measurement section for measuring a frequency of the signal being measured, the measurement frequency based on the measurement result by the measuring section And a control unit that controls the frequency measurement by the measurement unit and displays the measurement frequency on the display unit.

Therefore, according to the measurement system of claim 1, wherein, by mounting the downconverter device to the measuring device, measuring the frequency of the high-frequency signal exceeding the measurable range of separate measuring device (measuring device and the measuring device Frequency of high frequency signals exceeding the measurable range of the measuring device can be measured without using a dedicated measuring device) or by providing a signal input connector for high frequency signal input in the measuring device. . Therefore, according to this measurement system, it is possible to avoid upsizing of the measuring device, the measurement time and frequencies to target signal within the measuring range of the measuring device, a voltage value, current value and When measuring a resistance value or the like, it is possible to sufficiently avoid a situation in which the portability of the measuring device is impaired.
Further, according to this measurement system, the down-converter device includes the division ratio information output unit that outputs the division ratio information indicating the predetermined division ratio to the measurement device, and the control unit of the measurement device is controlled by the measurement unit. The measurement target output from the measurement target by calculating the frequency of the input signal based on the measurement result and the frequency division ratio information output from the frequency division ratio information output unit and displaying it on the display unit as the measurement frequency The actual frequency of the signal (frequency before being down-converted by the down-converter device) can be displayed. Therefore, according to this measurement system, it is not necessary to replace the measurement frequency displayed on the display unit of the measurement device according to the frequency division ratio by the down-converter device, so this type of measurement system is used. Even a user who is unfamiliar with the measurement process can reliably and easily measure the correct frequency.

According to another aspect of the measurement system of the present invention, the frequency division ratio setting circuit for setting a predetermined frequency division ratio in the frequency division circuit is provided, and the frequency division circuit divides the input signal by the set frequency division ratio. As a result, the input signal can be divided (down-converted) and output at a frequency division ratio corresponding to the measurable range of the measuring device, so that the input signal is divided by one fixed frequency division ratio. Compared with the downconverter device configured to rotate and output, the range in which the frequency can be measured by the measuring device can be sufficiently expanded.

Hereinafter, with reference to the accompanying drawings, illustrating the best mode of engagement Ru measurement system according to the present invention.

  A measurement system S1A shown in FIG. 1 is an example of a measurement system according to the present invention, and includes a measurement device 1A and a down-converter device 4A. The measuring apparatus 1A is a portable digital multimeter, and includes a measuring apparatus main body 2a and a pair of measurement cables 3. In this case, the measurement cable 3 is a test lead generally used in this type of measurement apparatus (digital multimeter), and a probe 21 and a plug 22 (for example, a banana plug) are mutually connected by a cable 23. Connected and configured. As shown in FIG. 3, the measurement apparatus main body 2 a includes jacks 11 a and 11 b (hereinafter, also referred to as “jack 11” when not distinguished), a measurement unit 12, an operation unit 13, a display unit 14, and a control unit 15. ing.

  The jack 11 corresponds to a connection jack in the present invention, and is disposed on a front panel of a housing (case) in the measurement apparatus main body 2a as shown in FIG. 1 and connects the plug 22 of the measurement cable 3 ( The measurement cable 3 is configured to be insertable) and is connected to the measurement unit 12. The measurement unit 12 measures various electrical parameters such as a voltage value, a current value, a resistance value, and a frequency according to the control of the control unit 15. In addition, in this measuring device main body 2a, the measurement of the frequency within the range of 0.5 Hz-500.00 kHz is possible as an example. The operation unit 13 includes a rotary switch that selects the type of the above-described electrical parameter to be measured by the measurement unit 12, a measurement range, and the like (selects a measurement mode), and sends an operation signal corresponding to the switch operation to the control unit 15. Output. The display unit 14 is configured by an LCD display as an example, and displays the measurement result of the measurement process performed by the measurement unit 12 under the control of the control unit 15. The control unit 15 comprehensively controls the measuring device 1A (measuring device body 2a). Specifically, the control unit 15 controls the measurement unit 12 to measure various electrical parameters in the measurement mode and measurement range selected by the operation of the operation unit 13. In addition, the control unit 15 causes the display unit 14 to display the measurement result of the measurement process performed by the measurement unit 12.

  On the other hand, the down-converter device 4A is an optional part of the measuring device 1A as an example, and is configured separately from the measuring device 1A (measuring device body 2a) as shown in FIG. A frequency dividing circuit 32, a frequency dividing ratio setting circuit 33, an amplifier 34, and plugs 35a and 35b (hereinafter also referred to as “plug 35” when not distinguished) are provided. The connector 31 corresponds to the signal input connector in the present invention, and is constituted by a high-frequency signal input connector (for example, a coaxial connector such as a BNC connector or an SMA connector) and connected to the measurement object X. (As an example, the coaxial cable 5) can be connected. As an example, the frequency dividing circuit 32 includes a prescaler, and an input signal input via the connector 31 (coaxial cable 5) has a predetermined frequency dividing ratio (frequency dividing ratio set by the frequency dividing ratio setting circuit 33). Divide and output. In the down converter device 4A, an input resistor (not shown) for matching the impedance of the input signal is disposed between the connector 31 and the frequency dividing circuit 32. In this case, an input resistor capable of impedance matching with 50Ω is used as an example.

  The frequency division ratio setting circuit 33 has, for example, a plurality of types (for example, “x1 / 10 (1/10 times)”, “x1 / 100 (1/100 times)”, and “x1 / 1000 (1 / A switch 33a (see FIGS. 1 and 2) for selecting an arbitrary frequency division ratio from among the three types of frequency division ratios (1000 times) and setting the frequency division circuit 32 is provided. In this down-converter device 4A, when “x1 (equal magnification)” is selected by the switching operation of the switch 33a, the input signal can be passed through without performing the frequency division by the frequency dividing circuit 32. It is configured. In this case, in this down-converter device 4A, a power supply unit (for example, a primary battery or a secondary battery: not shown) for supplying power to the frequency dividing circuit 32 or the like is provided with the frequency dividing circuit 32 or the frequency dividing ratio. Arranged in the case together with the setting circuit 33, it is possible to operate without receiving external power supply.

  The amplifier 34 amplifies and outputs the output signal of the frequency dividing circuit 32. The plug (signal output connector) 35 corresponds to the connection plug in the present invention, and is composed of a connector (in this example, a banana plug) of the same standard as the plug 22 in the measurement cable 3 described above. It is arranged to be connectable (insertable) to the jack 11 of the main body 2a. In this case, as shown in FIGS. 1 and 2, in this measurement system S1A, the center-to-center distance L2 of both plugs 35 in the down-converter device 4A is equal to the center-to-center distance L1 of both jacks 11 in the measuring device body 2a. Both plugs 35 are erected on the case of the down converter device 4A.

  Next, the usage method of measurement system S1A is demonstrated with reference to drawings.

  In this measurement system S1A, when measuring a voltage value, a current value, a resistance value, and a frequency within a measurable range by the measurement apparatus main body 2a, the plugs 22 of the measurement cable 3 are connected to both jacks 11 of the measurement apparatus main body 2a. Each is connected, and the probe 21 of both measurement cables 3 is brought into contact with the object to be measured, and a desired electrical parameter is measured. Since such a usage pattern is a normal usage pattern of this type of measuring apparatus (digital multimeter), detailed description thereof is omitted. In this case, in the measurement system S1A, since only the measurement device main body 2a and the measurement cable 3 need to be carried during normal use as described above (the down converter device 4A is not required), the portability is impaired. The situation has been avoided.

  On the other hand, when measuring the frequency of a high-frequency signal in the order of MHz or GHz (during measurement processing of a high frequency exceeding the upper limit of the measurable range by the measuring apparatus body 2a), the down converter is used instead of the two measurement cables 3. The apparatus 4A is connected to the measuring apparatus main body 2a. Specifically, the plug 22 of the measurement cable 3 is pulled out from the jacks 11a and 11b of the measuring device main body 2a, and the plugs 35a and 35b of the down converter device 4A are connected to the jacks 11a and 11b, respectively. The down converter device 4A is attached to At this time, as described above, since the center-to-center distance L2 between the plugs 35a and 35b of the down-converter device 4A is equal to the center-to-center distance L1 between the jacks 11a and 11b of the measuring device body 2a, the measuring device body 2a. The plugs 35a, 35b of the down converter device 4A can be reliably and smoothly connected to the jacks 11a, 11b.

  Next, the coaxial cable 5 is connected to the connector 31 of the down-converter device 4A, and the probe of the coaxial cable 5 is connected to the measurement object X. Subsequently, the switch 33a is switched according to a frequency band (or a known frequency band) predicted for the measurement target signal input via the coaxial cable 5. Specifically, as described above, the measurement apparatus main body 2a in the measurement system S1A is configured to be able to measure frequencies in the range of 0.5 Hz to 500.00 kHz. For this reason, when an input signal having a high frequency exceeding 500 kHz is used as the measurement target signal, the frequency cannot be measured by the measuring apparatus main body 2a alone. Therefore, as an example, when a signal of about 2.5 MHz is predicted to be input via the coaxial cable 5, the switch 33a is operated to, for example, “x 1/100 (1/100 times)” (this In the invention, an example of “desired division ratio” as “predetermined division ratio” is selected. In response to this, the frequency dividing ratio setting circuit 33 sets the frequency dividing ratio of “x1 / 100 (1/100 times)” in the frequency dividing circuit 32, and the frequency dividing circuit 32 is connected to the coaxial cable 5 (connector 31). The input signal input via the signal is divided by a set frequency dividing ratio (in this example, “1/100”) and output to the amplifier 34. In this case, for example, an input signal of 2.51 MHz is frequency-divided by the frequency dividing circuit 32 and output as a signal of 25.1 kHz. Thereafter, the output signal of the frequency dividing circuit 32 is amplified by the amplifier 34 and output to the measuring apparatus main body 2a via the plug 35.

  On the other hand, in the measurement apparatus main body 2a, the measurement unit 12 measures the frequency of the input signal (measurement target signal) input via the down-converter device 4A according to the control of the control unit 15. At this time, as described above, since the 2.51 MHz signal output from the measurement object X is down-converted to 25.1 kHz by the down-converter device 4A and input to the measurement device main body 2a, the measurement unit 12 outputs the measurement result of 25.10 kHz to the control unit 15. In response to this, the control unit 15 controls the display unit 14 to display the value “25.10 kHz” as the measurement frequency. At this time, since the user switches the switch 33a of the down-converter device 4A to “x1 / 100 (1/100 times)”, the measurement frequency displayed on the display unit 14 of the measurement apparatus main body 2a is Actually, it is understood that it is 100 times the frequency. Therefore, the user reads and acquires the value obtained by multiplying the measurement frequency displayed on the display unit 14 by 100. Thereby, based on the measurement frequency “25.10 kHz” displayed on the display unit 14, it is recognized that the frequency of the signal output from the measurement object X is “2.51 MHz”.

  As described above, in this down-converter device 4A, the connector 31 for inputting the input signal (measurement target signal) and the input signal input via the connector 31 are divided by a predetermined frequency dividing ratio and output. The divider circuit 32 is configured to be connectable to a pair of jacks 11a and 11b provided in the measuring apparatus 1A, and the output signal of the divider circuit 32 is output to the measuring apparatus 1A via the pair of jacks 11a and 11b. A pair of plugs 35a and 35b. The measurement system S1A includes the down-converter device 4A and the measurement device 1A. The measurement device 1A measures the frequency of the measurement target signal, and the measurement based on the measurement result by the measurement unit 12. A display unit 14 that displays the frequency and a control unit 15 that controls the measurement of the frequency by the measurement unit 12 and displays the measurement frequency on the display unit 14 are provided.

  For this reason, according to this down-converter device 4A and measurement system S1A, by attaching the down-converter device 4A to the measuring device main body 2a, the measuring device separate from the measuring device main body 2a (measurable range of the measuring device main body 2a) Measurement apparatus main body 2a can be measured without using a dedicated measurement apparatus capable of measuring the frequency of high-frequency signals exceeding 1) or by providing connector 31 for connecting coaxial cable 5 to measurement apparatus main body 2a. The frequency of the high frequency signal exceeding the range can be measured. Therefore, according to the down-converter device 4A and the measurement system S1A, it is possible to avoid an increase in the size of the measurement device main body 2a and to measure a frequency for a signal within a measurable range of the measurement device main body 2a. In addition, when measuring the voltage value, the current value, the resistance value, and the like, it is possible to sufficiently avoid a situation in which the portability of the measuring apparatus main body 2a is impaired.

  In addition, according to the downconverter device 4A, the frequency division ratio setting circuit 33 that sets a predetermined frequency division ratio (in this example, the frequency division ratio selected by the switching operation of the switch 33a) in the frequency divider circuit 32 is provided. The frequency dividing circuit 32 divides the input signal by the set frequency dividing ratio, thereby dividing (down-converting) the input signal by the frequency dividing ratio corresponding to the measurable range of the measuring apparatus body 2a. Compared with a downconverter device configured to divide and output an input signal with one fixed division ratio, the range in which the frequency can be measured by the measuring device body 2a is sufficiently large. Can be expanded.

Next, another embodiment of the engagement Ru measurement system according to the present invention will be described with reference to the drawings. In addition, about the component which has the same function as each component of said measurement system S1A, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  This measurement system S1B includes a measurement device 1B and a downconverter device 4B instead of the measurement device 1A and the downconverter device 4A in the measurement system S1A. The measuring apparatus 1B includes a measuring apparatus body 2b instead of the measuring apparatus body 2a in the measuring apparatus 1A. As shown in FIG. 5, the measuring device main body 2b is replaced by the control unit 15 in the measuring device main body 2a. As described later, the frequency dividing circuit 32 in the downconverter device 4B has the above-described three types of frequency dividing ratios. A control unit 15a is provided that specifies, based on the measurement result of the measurement unit 12, which frequency division ratio of the input signal is divided and output. In this case, the control unit 15a is configured in substantially the same manner as the control unit 15 in the measurement apparatus main body 2a (measurement apparatus 1A) described above, except for the process of specifying the frequency division ratio and the process of calculating the measurement frequency. Yes. A method for specifying the frequency division ratio based on the measurement result of the measurement unit 12 will be described in detail later.

  On the other hand, as shown in FIG. 6, the down-converter device 4B has information (the present invention) for specifying the switching state of the switch 33a (the “predetermined frequency division ratio” in the present invention) to the control unit 15a of the measuring device main body 2b. The resistor switching unit 36 outputs (detects) “frequency division ratio information”). Specifically, the resistor switching unit 36 corresponds to a frequency division ratio information output unit in the present invention, and has resistances R1 to R4 having different resistance values (hereinafter referred to as “resistor R” when not distinguished from each other). And a switch 36a for switching and connecting the plug 35a to any one of the resistors R1 to R4 in conjunction with the switching operation of the switch 33a. Further, in this down converter device 4B, a direct current blocking capacitor 37 is connected to the signal output section of the amplifier.

  In this measurement system S1B, in the same manner as the measurement system S1A described above, when measuring the voltage value, current value, resistance value, and the frequency within the measurable range of the measurement device body 2a, both jacks of the measurement device body 2a are used. 11 is connected to the plug 22 of the measurement cable 3 to execute measurement processing. Therefore, in the same manner as the measurement system S1A (measurement device 1A) described above, only the measurement device body 2b and the measurement cable 3 need be carried during normal use (the down converter device 4B is not required). The situation where the portability is impaired is avoided. On the other hand, at the time of high frequency measurement processing exceeding the measurable range of the measuring device main body 2b, the down converter device 4B is connected to the measuring device main body 2b instead of the two measurement cables 3. Specifically, the plugs 35a and 35b of the down-converter device 4B are connected to the jacks 11a and 11b, respectively, and the down-converter device 4B is attached to the measuring device main body 2b.

  Next, the coaxial cable 5 is connected to the connector 31 of the down-converter device 4B, and the probe of the coaxial cable 5 is connected to the measurement object X. Subsequently, the switch 33a is switched according to a predicted frequency band (or a known frequency band) related to the measurement target signal input via the coaxial cable 5. Specifically, as an example, when a signal of about 2.5 MHz is predicted to be input via the coaxial cable 5, the switch 33a is operated to, for example, “x1 / 100 (1/100 times)” (An example of “desired division ratio” as “predetermined division ratio” in the present invention). In response to this, the frequency dividing ratio setting circuit 33 sets the frequency dividing ratio of “x1 / 100 (1/100 times)” in the frequency dividing circuit 32, and the frequency dividing circuit 32 is connected to the coaxial cable 5 (connector 31). The input signal input via the signal is divided by a set frequency dividing ratio (in this example, “1/100”) and output to the amplifier 34. In this case, for example, an input signal of 2.51 MHz is frequency-divided by the frequency dividing circuit 32 and output as a signal of 25.1 kHz. Thereafter, the output signal of the frequency dividing circuit 32 is amplified by the amplifier 34 and output to the measuring apparatus main body 2b via the plug 35.

  In the down converter device 4B, when the switch 33a is switched to “x1 / 100 (1/100 times)”, the switch 36a of the resistor switching unit 36 connects the plug 35a to the resistor R3. Thereby, the resistance value between the plugs 35a and 35b becomes the resistance value of the resistor R3. In this case, in this down-converter device 4B, when the switch 33a is switched to “x1 (equal magnification)”, the switch 36a connects the plug 35a to the resistor R1, and the switch 33a is “x1 / 10 (1 / Switch 36a connects the plug 35a to the resistor R2, and when the switch 33a is switched to "x1 / 1000 (1/1000 times)", the switch 36a is connected to the plug 35a. Is connected to the resistor R4. Therefore, in this down-converter device 4B, the resistance value between the plugs 35a and 35b varies depending on the switching state of the switch 33a ("desired division ratio" as the "predetermined division ratio"). It becomes one of the resistance values.

  On the other hand, in the measuring device main body 2b, the measuring unit 12 supplies a predetermined direct current to the resistor switching unit 36 (specifically, the switched resistor R) of the down converter device 4B and jacks according to the control of the control unit 15a. The voltage value between 11a and 11b is measured, and the resistance value between the jacks 11a and 11b (that is, the plug 35a connected to the jacks 11a and 11b) is determined based on the measured voltage value and the current value of the supplied DC current. , 35b: an example of “frequency division ratio information” in the present invention, and the measurement result is output to the control unit 15a. At this time, based on the measured resistance value, the control unit 15a divides the input signal by a division ratio of “x1 / 100 (1/100 times)” and outputs it (downconverter). It is determined (specified) that the switch 33a of the device 4B is switched to “x1 / 100 (1/100 times)”. In addition, the control unit 15a controls the measurement unit 12 to measure the frequency of the input signal (measurement target signal) input via the down converter device 4B. At this time, as described above, since the 2.51 MHz signal output from the measurement object X is down-converted to 25.1 kHz by the down-converter device 4B and input to the measurement device body 2b, the measurement unit 12 outputs the measurement result of 25.10 kHz to the control unit 15a.

  Next, the control unit 15a determines the frequency division ratio (in this example, “25.10 kHz” in this example) and the frequency division ratio specified in this example based on the resistance value between the jacks 11a and 11b. x1 / 100 (1/100 times) ") based on the actual measurement signal (input signal output from the measurement object X to the coaxial cable 5) before the frequency division by the down converter 4B is executed. Calculate the frequency. Specifically, the control unit 15a multiplies the measurement result of 25.10 kHz by 1000 and calculates a value of 2.51 MHz. Subsequently, the control unit 15a controls the display unit 14 to display the calculation result (2.51 MHz) as the measurement frequency. Thereby, based on the measurement frequency “2.51 MHz” displayed on the display unit 14, the signal output from the measurement object X is recognized as “2.51 MHz”.

  As described above, in this down-converter device 4B, the connector 31 for connecting the coaxial cable 5 and the frequency dividing circuit 32 that divides and outputs the input signal input through the connector 31 at a predetermined frequency dividing ratio. A pair of plugs 35a configured to be connectable to a pair of jacks 11a and 11b provided in the measuring apparatus 1B and connected to the frequency dividing circuit 32 to input an output signal of the frequency dividing circuit 32 to the measuring apparatus 1B. 35b. The measurement system S1B includes the down-converter device 4B and the measurement device 1B. The measurement device 1B measures the frequency of the measurement target signal, and the measurement based on the measurement result by the measurement unit 12. A display unit 14 that displays the frequency and a control unit 15 a that controls the measurement of the frequency by the measurement unit 12 and displays the measurement frequency on the display unit 14 are provided.

  Therefore, according to the down converter device 4B and the measurement system S1B, the down converter device 4B is mounted on the measurement device main body 2b in the same manner as the down converter device 4A and the measurement system S1A, thereby measuring the main body 2b. Using a separate measurement device (a dedicated measurement device capable of measuring the frequency of a high-frequency signal exceeding the measurable range of the measurement device main body 2b), or a connector 31 for connecting the coaxial cable 5 to the measurement device main body 2b. Without arranging, it is possible to measure the frequency of the high-frequency signal that exceeds the measurable range of the measuring apparatus main body 2b. Therefore, according to the down-converter device 4B and the measurement system S1B, it is possible to avoid an increase in the size of the measurement device main body 2b, and at the time of measuring a frequency for a signal within the measurable range of the measurement device main body 2b. In addition, when measuring the voltage value, the current value, the resistance value, etc., it is possible to sufficiently avoid a situation in which the portability of the measuring apparatus main body 2b is impaired.

  Further, the down converter device 4B includes the frequency division ratio setting circuit 33 that sets a predetermined frequency division ratio in the frequency division circuit 32, and the frequency division circuit 32 divides the input signal by the set frequency division ratio. By doing so, the input signal can be divided (down-converted) and output at a frequency division ratio according to the measurable range of the measurement apparatus main body 2b in the same manner as the down-converter device 4A. Compared with a down-converter device configured to divide and output an input signal with a single fixed division ratio, the range in which the frequency can be measured by the measuring device body 2b can be sufficiently expanded.

  Furthermore, according to this measurement system S1B, the down converter device 4B outputs frequency division ratio information indicating a predetermined frequency division ratio to the measurement device 1B (in this example, the plugs 35a, A resistance switching unit 36 that makes the resistance value between 35b different from each other, and the control unit 15a of the measuring device 1B outputs the measurement result by the measuring unit 12 and the output from the resistor switching unit 36 (down converter device 4B). The frequency of the input signal (the input signal before being divided by the down-converter device 4B) is calculated based on the ratio information (in this example, the resistance value between the jacks 11a and 11b to which the plugs 35a and 35b are connected). Then, the actual frequency of the measurement target signal output from the measurement target body X (by the down converter device 4B) is displayed on the display unit 14 as the measurement frequency. Te division (down-converts) the frequency before being) can be displayed. Therefore, according to this measurement system S1B, unlike the measurement system S1A described above, the operation of reading the measurement frequency displayed on the display unit 14 of the measurement apparatus main body 2b in accordance with the frequency division ratio by the down-converter apparatus 4B. Therefore, even a user unfamiliar with measurement processing using this type of measurement system can reliably and easily measure the correct frequency.

  In addition, this invention is not limited to said structure and method. For example, the distance L2 between the centers of the plugs 35a and 35b in the down-converter devices 4A and 4B is matched with the distance L1 between the centers of the jacks 11a and 11b in the measuring device main bodies 2a and 2b. However, the present invention is not limited to this, and at least one of the plugs 35 in the down-converter devices 4A and 4B can be moved in a direction in which the plug 35 is in contact with or separated from the other. The distance between the centers of the plugs 35 can be arbitrarily changed. Further, instead of the plug 35 in the down converter devices 4A and 4B, a configuration in which a cable having a plug 35 connected to one end thereof is connected to an amplifier (or a frequency dividing circuit) of the down converter device (a cable to which the plug 35 is connected). It is also possible to employ a configuration in which the down converter device is connected to the measuring device main bodies 2a and 2b. By adopting such a configuration, the down-converter device can be attached to various measuring devices (measuring device main bodies) in which the distance between the centers of the pair of jacks for connecting the measuring cables is different.

  Further, three types of frequency division ratios of “x1 / 10 (1/10 times)”, “x1 / 100 (1/100 times)” and “x1 / 1000 (1/1000 times)”, and “x1 (etc.) The downconverter devices 4A and 4B that divide the input signal at an arbitrary frequency dividing ratio of “x1”) have been described as an example. However, “x1 (equal magnification: frequency division by the frequency dividing circuit 32 is not performed)” It is possible to adopt a configuration in which there is no option “ Furthermore, the number of “predetermined frequency division ratios” in the present invention is not limited to the above three types, and four or more types or two types of various frequency division ratios can be set as “predetermined frequency division ratios”. Can be configured. Further, it is possible to adopt a configuration in which the input signal is divided by one type of fixed division ratio.

  Furthermore, the “predetermined frequency division ratio” in the present invention is not necessarily limited to “a plurality of predefined types”, and a configuration in which an arbitrary frequency division ratio is set from a frequency division ratio within a predetermined range. Can be adopted. Specifically, as an example, a configuration in which a digital switch is provided in place of the switch 33a and the “desired division ratio” in the present invention can be arbitrarily set can be employed. In such a configuration, the digital signal output from the digital switch is output to the measuring device as “frequency division ratio information” in the present invention, and the control unit of the measuring device outputs the digital signal output from the down converter device (digital switch). Based on the signal and the measurement result of the measurement unit, the measurement frequency is calculated and displayed on the display unit.

  Further, the down-converter device 4B that outputs the frequency division ratio information in the present invention through the plugs 35a and 35b, and the frequency division ratio by the frequency dividing circuit 32 based on the frequency division ratio information input through the jacks 11a and 11b. The down converter device 4B provided with the measuring device main body 2b for specifying the above has been described as an example, but the present invention is not limited to this, and the down converter having a dedicated terminal for outputting the division ratio information in the present invention A measurement system can be configured by including a converter device and a measurement device (measurement device main body) having a dedicated terminal for inputting frequency division ratio information. Furthermore, it is also possible to employ a configuration in which frequency division ratio information is transmitted and received by wireless communication between the down converter device and the measuring device (measuring device body). In addition, a power supply unit (for example, a primary battery or a secondary battery: not shown) for supplying power to the frequency divider circuit 32 and the like is disposed in the case together with the frequency divider circuit 32 and the frequency division ratio setting circuit 33. Although an example has been described in which it is configured to be operable without receiving external power supply, a configuration in which power is supplied from the measurement device main bodies 2a and 2b to the down-converter devices 4A and 4B may be employed.

It is an external view of measuring device 1A, 1B (measuring device main body 2a, 2b and measuring cable 3) and down converter device 4A, 4B in measuring system S1A, S1B. It is a side view of down converter device 4A, 4B. It is a block diagram which shows the structure of 1 A of measuring apparatuses in measuring system S1A. It is a block diagram which shows the structure of 4 A of down converter apparatuses in measurement system S1A. It is a block diagram which shows the structure of the measuring apparatus 1B in measurement system S1B. It is a block diagram which shows the structure of the down converter apparatus 4B in measurement system S1B.

Explanation of symbols

S1A, S1B measurement system 1A, 1B measurement device 2a, 2b measurement device main body 3 measurement cable 4A, 4B down converter device 5 coaxial cable 11a, 11b jack 12 measurement unit 14 display unit 15 control unit 31 connector 32 frequency divider circuit 33 minute Circumference ratio setting circuit 33a Switch 35a, 35b Plug 36 Resistor switching unit 36a Switch R1 to R4 Resistor X Measurement object

Claims (2)

Provided in a measuring device, a signal input connector for inputting an input signal, a frequency dividing circuit that divides and outputs the input signal input through the signal input connector at a predetermined frequency dividing ratio. And a pair of connection plugs that are configured to be connectable to a pair of connection jacks and that output the output signal of the frequency dividing circuit to the measurement device via the pair of connection jacks. A converter device and the measuring device;
The down-converter device includes a frequency division ratio information output unit that outputs frequency division ratio information indicating the predetermined frequency division ratio to the measurement device,
The measuring apparatus controls a measurement unit that measures a frequency of a measurement target signal, a display unit that displays a measurement frequency based on a measurement result by the measurement unit, and controls the measurement of the frequency by the measurement unit. A control unit for displaying on the display unit,
The control unit calculates the frequency of the input signal based on the measurement result by the measurement unit and the frequency division ratio information output from the frequency division ratio information output unit, and calculates the frequency as the measurement frequency on the display unit. Measurement system to be displayed . The down converter device includes a frequency division ratio setting circuit that sets a desired frequency division ratio in the frequency divider circuit as the predetermined frequency division ratio.
The measurement system according to claim 1, wherein the frequency dividing circuit divides the input signal by a frequency dividing ratio set by the frequency dividing ratio setting circuit.

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