SU78966A1 - A device for testing the operation of PBX telephone dialers - Google Patents

Description

A device is proposed for testing the operation of night-timers of telephone sets during control measurements on automatic telephone stations and when setting up dialers.

Currently, for the purposes of monitoring and adjusting dialers, an undulator is used, the use of which is not justified due to the considerable laboriousness of measurement.

The proposed device makes it possible to judge the malfunctioning of dialers and can facilitate the work of repairing them.

A distinctive feature of the proposed device is that the values of the pulse coefficient and the speed of the return of the dialer are measured directly by the deviation of the arrow on the scale of the switch instrument connected at the output of the lamp voltmeter. The amount of deviation of the instrument arrow is determined by the magnitude of the electric potential up to which the capacitor connected to the grid of the electron tube is charged.

The operation of the device is based on measuring the voltage of a capacitor.

charged through the resistance; the phenomenon of Ri from the battery of the PBX connected to the breaker P (see the basic diagram).

When measuring the duration of a series of pulses, the capacitor is charged continuously throughout the series. The voltage at the end of the charge shows on the scale of the instrument the duration of the series.

The determination of the pulse coefficient is also made by the pathway; measuring the voltage on the capacitor, but in this case the capacitor is charged by jerks only during the opening of the dialer circuit. The size of the copula of the digit O of the resistance through which the capacitor is charged in this case is chosen so that with .5 and a constant return rate of the dialer, the instrument arrow deviates by the same angle as with the E3-measure; 1 the return rate of the same dialer. More or less deviation of the arrow will indicate a deviation of the value of K from the standard in one direction or another.

Relay A, shown in the circuit diagram of the device, is used to transmit pulses. Relay B (intermediate) turns off the relay circuit B and the counter circuit after the end of the measurement. Relay B when measuring closes the capacitor charge circuit. Relay C serves to discharge the capacitor after the measurement. Relays B and C have a release slowdown of about 100-200 ms, relay C has the highest possible release slowdown.

Since a lamp voltmeter, in the absence of a grid current, has an input resistance for direct current, almost equal to infinity, a capacitor that is charged while dialing the O digit can retain its charge for a long time. This makes it possible to record the instrument reading for a time sufficient for reference. After the end of the countdown, the capacitor discharges through resistance.

The resistance to discharge the capacitor is connected to it when releasing the core of a very slow relay C. If it is necessary to increase the fixation time, then relay C can

Manually remove and discharge the capacitor by pushing a button.

Subject invention

Claims (2)

1. A device for testing the operation of PBX phone dialers, characterized in that the values of the pulse factor and the speed of the dialer return are counted directly according to the deviation of the arrow on the scale of the switch device turned on at the output of the lamp voltmeter, and the value of the deviation of the arrow of the device is determined by the value of electric potential up to which the capacitor charged in the grid circuit of the electron tube is charged. 2. The device according to claim 1, which is such that when the dialer speed is measured, a continuous charge of the capacitor included in the grid of the electron tube occurs, and npi measuring the pulse ratio of the charge of this capacitor tact with incoming pulses.