JPS6123976A - Testing method of subscriber circuit - Google Patents

Abstract

PURPOSE:To shorten the transmission characteristic measurement time of a subscriber circuit by applying signals of plural frequencies at the same time. CONSTITUTION:Respective frequency signals f1-fn from oscillators 11-1n are put together by a circuit 7 and the composite signal is applied to 2W sides of subscriber circuits 41-4n. Then 4w sides of the circuits 41-4n are connected to respective selectors 8 on multiple basis and outputs of the selectors 8 are passed through D/A converters 5 and then filters 91-9n corresponding to respective frequencies, and measured by selection level meters 61-6n. Therefore, the frequency need not be varied according to a measurement point and a response wait time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for measuring the transmission characteristics of a subscriber circuit package. [Background of the Invention] A conventional measurement circuit for measuring the transmission characteristics of a subscriber circuit package is ,
As shown in FIG. 1, one oscillator 1 was used to apply a signal, and one selected level meter 6 was used for measurement. In this method, since a DC signal is applied to the subscriber circuit package and a signal is applied using one oscillator, a transient response time when applying a signal is required, which may result in a long measurement time.

[Purpose of the invention]

The purpose of the present invention is to improve the drawbacks of the prior art described above, and to provide a method for applying multiple frequencies and simultaneously measuring transmission characteristics corresponding to each frequency. In the transmission characteristic measurement circuit of the subscriber circuit package, there is a circuit that combines multiple oscillator outputs, a circuit that connects the 2W side of the subscriber circuit PKG, a load, a selector,
It is characterized by consisting of a plurality of selective level meters, applying a plurality of frequencies at the same time, and simultaneously measuring the transmission characteristics corresponding to each frequency.

[Embodiments of the invention]

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

Reference numerals 7 and 7n are oscillators that output frequency signals of f and -fn, respectively, and 8 is a circuit that synthesizes these frequency signals. The signals synthesized by this frequency signal synthesis circuit 8 are applied to 2W[ll of subscriber circuit packages 41 to 4n, respectively. Subscriber circuit package 4. The 4W sides of 4n to 4n are connected to selectors 5 in multiple ways, and the outputs of the selectors 5 are sent via D/A converters 5 to filters 11 . The frequency of interest 'I! through ~1in! Output the I component and select a level meter6. Measured at ~6n.

Therefore, there is no need to change the frequency according to the measurement point, and the response waiting time can be shortened.

〔Effect of the invention〕

As explained above, according to the present invention, since multiple frequencies can be simultaneously applied and measured, the time required to measure the transmission characteristics of subscriber circuit packages can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a conventional measurement method, and FIG. 2 is a block diagram of an embodiment of the present invention. 1.11~1n: Oscillator, 2: Capacitor, 5:
DC superimposition circuit, 4.41~4n: Subscriber circuit package, 6.61~6
n: selection level meter, 7: frequency synthesis circuit, 8: selector, 91 to 9n: filter.

Claims (1)

[Claims] 1. In the transmission characteristic measurement circuit of the subscriber circuit package, the subscriber circuit PKG is a circuit that synthesizes multiple oscillator outputs.
A subscriber circuit testing method consisting of a circuit that double-connects the 2W side of the circuit, a load, a selector, and a plurality of selection level meters, which simultaneously applies multiple frequencies and simultaneously measures the transmission characteristics corresponding to each frequency. .