RU1793467C - Multichannel device for electric equipment testing - Google Patents

Abstract

The invention relates to electrical engineering and is used to drive tape mechanisms (VLM) of cassette recorders. SUMMARY OF THE INVENTION: the device comprises a group of two-threshold comparators connected by measuring inputs to the outputs of the tested CVLs, a failure light panel connected to the inputs of an OR logic element, the output of which is connected to the input of a common failure indicator, a compensating voltage source connected to a group of resistors, a common bus, elements for suspension of the tested CVL, made in the form of two electrical contacts, closed through the body of the CVL. One of the contacts is connected to a common bus, the other to the first input of the logical element EXCLUSIVE OR and the mentioned resistor. The second input of the EXCLUSIVE OR element is connected to the output of the comparator, and the output is connected to one of the input of the fault display. The device is equipped with a threshold indicator enable switch, a calibrated flow of the tested LMC, and a timer whose output is connected to the additional input of the OR element. 1 s, s, s-1, silt, (L C

Description

The invention relates to electrical engineering and can be used in mass production for the electric drive of various electrical equipment containing a dc or ac consumer and having an external electrically conductive housing, for example for driving tape drives (VLM) of cassette recorders.

The tape drives of cassette recorders, especially gear recorders, are subject to prolonged electric driving for the purpose of running in of rotating elements. VLM run at the enterprise is carried out on a 500-seat electric drive conveyor containing

cells with pins for suspension of the CVL, a constant current source for powering the tested LG1M, connected to them via incandescent lamps, groups of connectors.

In such a device with a short circuit. When the CVM is pulled or jammed, the incandescent signal lamp lights up in full heat, signaling a failure and protecting the power supply circuit from overload. Such an alarm has a low information content.

A multichannel device for electro-driving sound frequency equipment is known, comprising a group of comparators. connected by measuring inputs to

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the outputs of the tested devices, and the output - to the control inputs of the keys breaking the power supply circuit of the device, a multi-channel light failure display, an IL element, a general failure indicator, and a compensating voltage source.

Such a device provides high information content, however, the control volume is limited in that the comparators only respond to a decrease in the output signal of the device under test. In addition, the device is applicable only for driving electroactive devices generating an output signal and having input and output terminals, through which an additional compensating voltage is switched.

The invention solves the problem of expanding technological capabilities, and in particular increasing the volume of control and range of passive electric devices that consume electric current and have an external electrically conductive housing, while maintaining high information content, namely, maintaining the function of resetting the failure indication when the device under test is removed from the run .

To do this, a multichannel device for running electric devices, containing a group of comparators connected by measuring inputs to the outputs of the devices under test, a failure light panel, the inputs of which are connected to the inputs of the OR logic element, the output of which is connected to the input of a common failure indicator, a reference voltage source, a compensating source The voltage connected to the group of resistors by an output, the common bus, as well as elements for suspending or securing the devices under test, is equipped with a dead zone controller of comparators, sensors for the presence of the devices under test, a group of two-input logic elements EXCLUSIVE OR, moreover, the comparators are made with two thresholds, and the mentioned regulator is calibrated by the current consumption of the device under test, one of the sensor contacts is connected to a common bus, the other to the first input of the logic of the EXCLUSIVE OR element and the corresponding resistor, the second input of this logic element is connected to the output of the comparator, and the output to one of the inputs of the fault display.

In addition, the device may be equipped with a timer, and the OR logic element is provided with an additional input, the output of the timer being connected to the input.

The drawing shows a functional diagram of the device.

A multi-channel device for running electric devices contains a group of 5 comparators 1 connected by outputs to one of the inputs of the group of two-input logic elements EXCLUSIVE OR 2, the outputs of which are connected to the inputs of the light panel 3 and the inputs of the multi-input logic element OR 4, the output of which is connected to the control input of the common indicator 5 bounce. In addition, the device contains a source of b reference voltages of upper and lower tolerance, the value

5 of which can be set by the regulator 7 of the dead zone of the comparators 1, the source 8 of the compensating voltage connected by the output through the resistors 9 to the inputs of the logic elements

0 EXCLUSIVE OR 2 and contacts 10 of the device for suspension of the devices under test 11, the second contacts 12 of which are connected to a common bus 13. Contacts 10, 12 are connected to each other through a wire: .5 the housing of the device under test 11 and form the Device presence sensor 11, combined with a suspension device. The power to the devices 11 is supplied from a common source 14 through the key elements 15, controlled by the comparators 1 sequentially through the logic elements EXCLUSIVE OR 2 (in the drawing, only one control circuit is shown in full). In the power circuit of each device 11, current-measuring resistors are connected 16, the voltage from which is supplied to the measuring inputs of the comparators 1. The controller 7 of the thresholds for switching on the fault indication is equipped with a scale

0 17 calibrated by the current consumption of the UUT. To count the run time in a given mode, a timer 18, is used. the output of which is connected to an additional input of logic element 5 OR AND 4.

Compensating voltage source 8 should output a logical 1 voltage depending on the type

. applied elements EXCLUSIVE

0 OR 2, usually 5 ... 10 V. The type of comparator and keys 15 is selected depending on the characteristics of the supply voltage and power of the devices under test 11. The drawing shows a possible variant of control5 with key 15 from the output of the item CUSTOM OR 2 without matching elements. EXCLUSIVE OR 2 logic elements only issue a signal if there is a signal at only one of its inputs. A device may comprise from several tens to several hundred control channels.

The device operates as follows.

First, the regulator 7 of the thresholds for turning on the fault indication on a scale 17 sets the necessary thresholds for the operation of the comparators 1, and on the scale of the timer 18 - the necessary run time, load the device with checked devices 11. If there is no apparatus 11 (shown in dashed line) contacts 10, 12 are open and an exclusive logic level is applied to the input of the EXCLUSIVE OR 2 logic element through a resistor 9. The second input of the EXCLUSIVE OR 2 element also receives a unit level from the output of the comparator 1, since a voltage much lower than the threshold voltage is applied to its measuring input (there is no voltage drop across the resistor 16). Therefore, at the output of the element EXCLUSIVE OR 2, there is no signal and the light panel signals the absence of a failure. In the presence of the apparatus 11, the contacts 10, 12 and the first input of the EXCLUSIVE OR 2 element are closed through the chassis of the apparatus 11 to the common bus 13. Moreover, if the current consumption of the apparatus 11 does not exceed the limits set by the regulator 7, the comparator 1 does not work and at the second input of the element EXCLUSIVE OR 2 there is no signal. With the same state of the inputs of the EXCLUSIVE OR 2 element, there is no signal at its output, and the light panel, as in the absence of apparatus 11, indicates the absence of failure. If during the run, a failure of the apparatus 11 occurs, leading to a change in the consumption current outside the dead zone set by the regulator 7, the corresponding comparator 1 is activated, and the element EXCLUSIVE OR 2 transmits this signal to the input of the display 3 and then through the element IL AND 4 to the input of the common indicator 5 of failures and the input of key management 15. In this case, the power is removed from the failed device 11, a signal 3 of the corresponding device and a signal of general failure are generated on the display 3. When the failed device 11 is removed from the run, the contacts 10,12 open and the failure indication is automatically reset. After a period of time specified by the timer 18 has elapsed, an additional level of 1 appears at the additional input of the OR logic 4, which is transmitted to the control input of the common failure indicator 5.

The introduction of a group of additional EXCLUSIVE OR elements into the run device, connected in series with the output of the comparators and controlled by the presence sensor of the device under test, combined with the suspension, simplifies the run technical process, increases the information content and technological capabilities. The presence of a threshold indicator enable switch and a timer allow you to quickly configure the run device to detect certain failures.

Claims (2)

SUMMARY OF THE INVENTION 1. A multichannel device for driving electric appliances, comprising a group of comparators connected by measuring inputs to the outputs of the monitored devices; paratov, light bounce board, inputs; which are connected to the inputs of a logical: OR element, the output of which is connected to; input of a common indicator of failures, source of compensating voltage, output; a house connected to a group of resistors ;; a common bus, as well as elements for suspension of the devices under test, characterized in that, in order to expand the technological capabilities of the run, it is additionally equipped with a dead band regulator for comparators, sensors for the presence of devices under test; by a group of two-input logic elements EXCLUSIVE OR, and the comparators are double-biased, and the regulator is calibrated by the current consumption of the device under test, one of the sensor contacts is connected to a common bus, the second to the first input of the EXCLUSIVE OR logic element and the corresponding resistor, the second input of this the logic element is connected to the output of the comparator, and the output is connected to one of the inputs of the fault display. 2. The device according to claim 1, with the proviso that it is equipped with a timer, and the OR logic element is made with an additional input, moreover, the timer output is connected to said input. -Jt fifteen P- ..# 4g Ljfsrao C - - | "., I -. "," -C / Ј g ir about -6 / $