JPH09319989A - Signal-measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and price of a signal-measuring system. SOLUTION: The signal measuring instrument 1 has a function for returning an inputted measuring signal in its inside and outputting the returned signal. A switching part 4 is provided with a control circuit 6 for outputting a switching control signal for switching a switch 5, the switch 5 for switching a measuring signal transmission route, based on the received switching control signal and a return signal output contact 7 for returning and outputting the measuring signal and the transmission route is switched to the side of a measuring circuit 3 or the side of the contact 7. Since it is unnecessary to prepare a device and a cable for switching or distributing a measuring signal on the outside of the body, the small size and the low price of the measuring system is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal measuring device having a measurement signal return output function, and more particularly to a signal measuring device for high frequency signals and other electrical signals.

[0002]

2. Description of the Related Art In general, a conventional signal measuring device is provided with a switcher for switching the measuring signal or a distributor for distributing when the measuring function which the main body does not have is supplemented by another measuring device. Then, the measurement signal is switched or distributed to the different function measuring device.

FIG. 6 is a block diagram showing an example of a measuring system using a conventional signal measuring device. Measurement is under test 2
The electrical signal output by 03 is performed. The function A signal measuring device 501 has the function A and performs the measurement that can be performed by the function A. The function B signal measuring device 202 has a function B,
Perform possible measurements with Function B. The switch 504 switches whether the electrical signal output from the device under test 203 is input to the function A signal measuring device 501 or the function B signal measuring device 202. The controller 505 is a switch 5
It is controlled by a switching control signal which outputs the switching operation of No. 04.

In such a measurement system, in the measurement of the electric signal output from the object 203 to be measured, the measurement items that can be measured by the function A are measured by the function A signal measuring device 501. The measurement items that cannot be measured by the function A and that can be measured by the function B are measured by the function B signal measuring device 202.
At this time, the signal transmission path is switched by the switch 504. The switching of the switch 504 is controlled by a signal output from the control device 505. The control device 505 is, for example, I
The personal computer is equipped with an I / O interface and a remote interface, and outputs a switching control signal for the switching device 504 in accordance with a manual input from an operator or a measurement program.

[0005]

In the prior art, since the switching device is provided outside the signal measuring device, a control device for controlling the switching device, a cable, a casing of the switching device, etc. are required. There is a problem that the measuring system becomes large and difficult to configure, and the cost for configuring the measuring system increases.

It is an object of the present invention to provide a signal measurement system that is inexpensive to construct.

Another object of the present invention is to provide a signal measuring system having a small configuration scale.

[0008]

A signal measuring device with a measurement signal loopback output function of the present invention has a function of looping back and outputting a measurement signal in order to supplement the measurement function not provided in the main body with another external signal measurement device. . More specifically, a control circuit that controls switching of the signal transmission path by an operator's operation or a command from the measurement program, a switcher that switches the signal transmission path, and a return signal output connector that outputs the signal under measurement in return. Have and.

The signal measuring device with the measurement signal return output function of the present invention outputs the transmission path of the measurement signal to the measurement circuit of the main body or outputs it by a key operation of the operator or a remote command from the measurement program, as necessary. Switch to a plug. Therefore, it is possible to easily supplement the measuring function which the main body does not have with another signal measuring device connected to the output connector, and it is possible to reduce the size and cost of the measuring system.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a signal measuring device according to a first embodiment of the present invention. This signal measuring device 1 has a function of internally returning the input measurement signal when it is desired to use the measurement signal in another device, such as supplementing a function which the main body does not have with another second signal measuring device. are doing.

The signal measuring device 1 comprises a measuring circuit 3, a signal switching section 4, a key input section 8 and a remote interface section 9. The signal switching section 4 includes a control circuit 6, a switching unit 5 and a loopback. It is composed of a signal output connector 7. The switching unit 4 receives a control signal based on a key operation on the key input unit 8 or a remote control command to the remote interface unit 9, and measures the transmission path of the measurement signal input from the signal input connector 2. Circuit 3 side, or
Switch to the return signal output connector 7 side.

In the switching unit 4, the control circuit 6 receives a control signal from the key input unit 8 or the remote interface unit 9 and outputs a switching control signal for switching the switching unit 5. The switch 5 is specifically a relay, an RF relay, or the like, and switches the transmission path of the measurement signal based on the received switching control signal. The return signal output plug 7 is an output plug of the measurement signal when the key input unit 8 and the remote interface unit 9 specify the return signal output of the measurement signal.

FIG. 2 is a block diagram of a measuring system using the signal measuring device of the embodiment shown in FIG.
Can be directly connected to the signal input connector 2 of the signal measuring device 1, and the return signal output connector 7 of the signal measuring device 1 can be further connected.
Further, the signal measuring device 202 having another function can be directly connected.

Next, the operation of the embodiment shown in FIG. 1 will be described in detail with reference to the drawings. In FIG. 1, the measurement signal input to the signal input plug 2 of the signal measuring device 1 is input from the signal input plug 2. If the input measurement signal can be measured by the switching unit 4 using the measurement function of the signal measuring device 1, the measurement signal is output to the measurement circuit 3 side such that the measurement signal is measured by another second signal measuring device. If necessary, the signal transmission path is switched and transmitted to the return signal output connector 7 side.

The flow of measurement by the signal measuring device 1 at this time will be described with reference to the flow chart shown in FIG. In the switching unit 4, the control circuit 6 controls the key input unit 8 by a manual operation of an operator and the remote interface unit 9.
Based on a remote control command or the like by the measurement program to (step 301), it is determined whether or not the measurement signal should be returned and output (step 302), and the switch 5
To output a switching control signal (step 303 or 3).
06). Receiving the switching control signal, the switching device 5 switches the signal transmission path to the side designated by the switching control signal, out of the measuring circuit 3 side and the return signal output connector 7 side (step 304 or 307). .

By this switching operation, in the measurement system using the signal measuring device 1, when the signal measuring device 1 can perform the measurement, the signal measuring device 1 main body measures (step 305) and the measurement signal is changed to another second. If it is necessary to measure with the signal measuring device, it can be measured with the second signal measuring device. While measuring with the second signal measuring device, the measuring circuit 3 of the signal measuring device 1
Enters the waiting state (step 308).

Next, a signal measuring device which is a second embodiment of the present invention will be described with reference to FIG.

The second embodiment is provided with a distributor 405 and a distributor 404 including a return signal output connector 7. The distributor 405 connects the signal input connector 2 to the signal measuring device 1.
It is provided between the signal input connector 2 and the output connector 7 in order to output the input measurement signal to the return signal output connector 7. The distributor 404 can simultaneously transmit the measurement signal to the measurement circuit 3 and the return signal output connector 7 in the signal measurement device 1, and the external first external device connected to the signal measurement device 1 and the return signal input connector 7 can be used. The two signal measuring devices can simultaneously measure the measurement signals.

The second embodiment has the advantage that the control circuit for switching in the first embodiment can be eliminated.

Further, as a modification of the second embodiment, as shown in FIG. 5, a correction circuit 410 is provided between the distributor 405 in the signal distributor 414 and the return signal output connector 7 to distribute the signal. The power of the measurement signal whose characteristics have changed due to the distribution in the device 405 is corrected. Thereby, the return signal of the measurement signal can be measured without increasing the sensitivity of the second signal measuring device externally attached to the return signal output connector 7.

The correction circuit 410 can also be used in the first embodiment.

[0023]

According to the signal measuring device of the present invention, since no device or cable for switching or distributing the measuring signal is required outside the main body, the measuring system can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a signal measuring device of the present invention.

FIG. 2 is a block diagram showing an example of a measurement system when the signal measuring device of the present invention is used.

FIG. 3 is a flowchart of measurement by the signal measuring device of FIG.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram of a measurement system when a conventional signal measuring device is used.

[Explanation of symbols]

 1 signal measuring device 2 signal input plug 3 measuring circuit 4 signal switching part 5 switcher 6 control circuit 7 return signal output plug 8 key input part 9 remote interface part 202 signal measuring device 203 measured object 404 signal distributor 405 distribution 414 Signal distributor 210 Correction circuit 501 Signal measuring device 504 Switching device 505 Control device

Claims (7)

[Claims] 1. A signal measuring device, characterized in that a measurement signal taken in from an input connector is returned to an output connector. 2. The signal measuring device according to claim 1, wherein the measurement signal is returned by key operation or remote control. 3. The signal measuring device according to claim 1, wherein the measurement signal is constantly returned and output. 4. The signal measuring apparatus according to claim 1, wherein the characteristic of the measurement signal to be returned and output is corrected and output by the amount of change in the main body. 5. A signal measuring device comprising a signal input connector, a measuring circuit, and a key input unit and / or a remote interface unit, wherein a return signal output connector, and a measurement signal input to the signal input connector. And a switching circuit for switching to the measurement circuit or the return signal output plug, and a control circuit for controlling the switching operation of the switching circuit by a signal from the key input section or the remote interface section. Signal measuring device. 6. A signal measuring device comprising a signal input plug and a measuring circuit, wherein a return signal output plug and a measurement signal input to the signal input plug are distributed to the measuring circuit and the return signal. A signal measuring device comprising: a distributor. 7. A correction circuit for correcting the characteristics of the measurement signal changed by the switch or the distributor is provided between the return signal output connector and the switch or the distributor. The signal measuring device according to claim 5 or 6.