JPH03148073A - Open-site electromagnetic-wave measuring system using spectrum analyzer having a plurality of input terminals - Google Patents

Abstract

PURPOSE:To make it possible to shorten the measuring time of a noise by displaying the different signal inputs at the same time on a screen through a plurality of input terminals. CONSTITUTION:An antenna C is provided at a place where the noise from a product does not reach and connected to an input terminal A of a spectrum analyzer G. Then, an antenna D is provided based on the measuring method specified at each time and connected to an input terminal B of the analyzer G. For example, the terminal A is held at the first screen and the terminal B is held at the second screen at the maximum degree. At this time, the images can be readily observed when the same input as that to the terminal A or the terminal B is swept by using the third screen. Since the spectrum of the same frequency generated on the first and second screens is caused by external noise, the spectrum is removed with a computer when the measurement is finished. Only the required spectrum for the specified value for each time is measured based on the remaining spectrums. Since the external noise and the noise from a product can be measured at the same time, the time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention is applicable to radiated noise from computer equipment and other electronic equipment, which is regulated in each country. This relates to open site measurements in that case.

[Conventional technology] Conventionally, a spectrum analyzer had one input, so it measured the noise from the product and held it on one screen, then turned off the product, measured the external radio waves with the same antenna, and displayed two screens. The overlapping spectrum was used as an external radio wave.

[Problem to be solved by the invention] Since the measurement was performed as described above, external noise and noise from the product were not measured at the same time, and the radio waves from the fixed station among the external radio waves were constant, so there was a problem. However, it is not possible to determine whether the radio waves and noise from mobile stations or other sources are external noise or noise from the product.

[Means for solving the problem] As shown in Figure 2, in order to determine whether it is external noise or noise from the product to be measured, the antenna (C) is installed in a position where the noise from the product does not reach, and the spectrum is measured. Connect the antenna for measuring noise from the primary product, which is connected to input A of the analyzer, to input B of the spectrum analyzer. At the same time, input A and input B are max-held and measured.

[Function] As mentioned above, since external noise and noise from the product can be measured at the same time, it has the effect of reducing time, and the time taken to separate external noise and noise from the product can be reduced. .

[Example] Next, two examples will be shown using figures.

■As shown in Figure 2, install antenna C in a place where noise from the product does not reach, and connect it to input terminal A of the spectrum analyzer. Connect to input terminal B of (q).

Measure in this state. For example, input terminal A is connected to screen 1.
Max Bold to Max Bold and input terminal B to Max Hold on screen 2. Also, at this time, it is easier to see if the same input as input terminal A or input terminal B is displayed using screen 3.

At the end of the measurement, the same spectrum occurs on screen 1 and screen 2. This is deleted using the computer inside the spectrum analyzer or an externally connected computer, and the remaining spectrum is used to measure only the required spectrum using quasi-peak (QP) detection against each country's regulations (5). If it is carried out using a system such as 1 or more, it can be measured in simple places other than the actual site, such as the roof of a building.

■Example ■As shown in Figure 3, the input terminal currently available on the market can connect one spectrum analyzer to two
It is measured using a stand.

The antenna (C) in FIG. 3 is installed in a place where noise from the product does not reach, and connected to the spectrum analyzer (H).

Further, the antenna (D) is installed based on the measurement method prescribed in each country, connected to the spectrum analyzer (1), and measured in this state.

Set the screen of each spectrum analyzer to Max Bold, and when the measurement is finished, display the spectrum analyzer (H).
) and the spectrum analyzer (1) (6) - Since the spectrum is external noise, it is deleted by an external computer or by the computer inside the spectrum analyzer. In the case of manual measurement, a human determines and deletes the noise, and only the noise from the product is measured by QP detection using a spectrum analyzer or electric field strength measuring device.

[Effects of the Invention] Due to the above system, external noise and noise from the product can be easily separated in both automatic measurement and manual measurement.

Therefore, measurements can be made in an open site in the same way as in a radio anechoic chamber, and the measurement time can be significantly shortened.

[Brief explanation of the drawing]

Figure 1 shows a spectrum analyzer with multiple input terminals. FIG. 2 is a structural diagram of this system. FIG. 3 is a configuration diagram that uses a conventional spectrum analyzer and makes it possible to measure at the same level as this system. Input terminal Input terminal Antenna Antenna preamp External connection Computer Spectrum analyzer Spectrum analyzer Spectrum analyzer product (Equipment under test) Ground plane Turntable

Claims (1)

[Claims] 1. A spectrum analyzer equipped with multiple input terminals. 2. A spectrum analyzer that displays different signal inputs on the screen at the same time using multiple input terminals. 3. As shown in FIG. 2, an antenna (C) and an antenna (D) are installed using the spectrum analyzer described in claims 1 and 2. 4. Automatically control and measure the spectrum analyzer and data using the computer system within the spectrum analyzer or an external computer system. 5. Install the antenna C in a place where the noise from the product does not reach, and connect it to the input terminal (A) or input terminal (B) of the spectrum analyzer. Next, the antenna (D) is installed based on the measurement method regulated by each country, and connected to the input terminal (B) or input terminal (A) of the spectrum analyzer. Measurement is performed with the above configuration, input terminal (A) is max-held on screen 1, and input terminal (B) is max-held on screen 2. At the end of the measurement, spectra with the same frequency on screen 1 and screen 2 are removed by the computer because they are external noise. In addition, human judgment and deletion are performed, and only the noise from the product is measured using a spectrum analyzer and electric field strength meter to measure the necessary spectrum in accordance with each country's regulatory values. Open site electromagnetic wave measurement system using a spectrum analyzer with multiple input terminals.