SU1742742A1 - Relative pulse duration digital meter - Google Patents

Abstract

The invention relates to measurement technology and can be used to measure the duty cycle of control signals. The aim of the invention is to expand the field of application by providing measurement of control signals of electromagnetic actuators. To do this, the pulse duty cycle meter, containing keys 1, 3, 4, generator 2, blocks 5, 6, trigger 7 and pulse counter 8, has been entered into block 5 for determining the switch-on moment and block 6 for determining the switch-off moment, the inputs of which are respectively connected to key outputs: 1, 4, and outputs - with the first and second inputs of the trigger 7. 1 Il.

Description

The invention relates to electrical measuring equipment, in particular to the measurement of time intervals, and can be used to measure the real duty cycle of control signals of electromagnetic actuators (ZIM).

A digital meter for the duty cycle of rectangular pulses is known, comprising a first key, a reference frequency generator, a main and auxiliary triggers, a second and a third key, a divider, a pulse rising edge device and a pulse counter. The output of the reference frequency generator is connected to the first input of the second key, the second input of which is connected to the output of the main trigger, the output of the second key is connected to the output of the pulse counter, the inputs of the first key and the third key are combined and connected to the input bus.

A disadvantage of the known device is that when measuring the duty cycle

pulses of the control signal of the ZIM the actual shape of the control signal of the ZIM differs from that measured due to the inertia of the magnetic elements.

The aim of the invention is to expand the field of application by measuring control signals of a ZIM.

The essence of the invention lies in the fact that instead of a splitter and a device for separating the falling edge of pulses, devices for determining the moment of turning on and the moment of turning off the ZIM are introduced.

Eliminates the need for an additional trigger. In this case, the measurement of the duty cycle of the ZIM is made not by the voltage, but by the time from the moment of switching on until the moment of turning off, which makes it possible to obtain information on the real duty cycle of the ZIM.

The drawing shows a structural diagram of the proposed meter for the duty ratio of the ZIM control signal.

CH5 H

Digital porosity meter contains key 1, generator of reference frequency 2, key 3, key 4, switch-on unit 5, switch-off moment determination unit 6, trigger 7 and pulse counter 8. Output buses are connected to outputs of keys 1 and 4, output of key 1 connected to the input of block 5, the output of key 4 is connected to the input of block 6, the output of which and the output of block 5 are connected to the outputs of trigger 7, the output of which is connected to the second input of key 3, the first input of which is connected to the output of generator 2, the output of key 3 is connected to input counter 8.

The meter works as follows.

A voltage signal from the electromagnetic actuator V and a voltage signal from the current sensor I, which is installed in the EIM circuit, are supplied to the meter input. This signal carries information about the time of switching on and the time of turning off of EIM. Actual information about the duty cycle of the measured signal can be obtained by measuring the time between the moments of switching on and off of the actuator. For this, a positive voltage signal from the current sensor is applied to the on-time detection unit - 5 via switch 1. By the output pulse of unit 5, trigger 7 changes its state to the opposite and turns on counter 8 through switch 3, thus fixing

five

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five

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The moment of switching on EIM. When a negative voltage appears, trigger 7 retains its state. Negative voltage of the input signal triggers the block of the switching off moment through the key 4. With the signal corresponding to the switching off moment with the output of the circuit 6, the trigger 7 is transferred to the opposite state. From the output of the trigger 7, a signal is sent to stop the counting of the counter 8 via the electronic key 3. In the counter 8 there is information about the current real duty cycle of the EIM.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A digital pulse duty cycle meter comprising first and second keys, the inputs of which are terminals for connecting, respectively, the test and triggering signals, a trigger, a third key and a pulse counter connected in series, a reference frequency generator, the output of which is connected to a third key input that differs In order to expand the scope of application by providing measurement of control signals of electromagnetic actuators and the on and off time detection unit, whose inputs are respectively connected to the outputs of the second and third keys, and the outputs to the first and second inputs of the trigger.