SU1448315A1 - Logical tester - Google Patents

Abstract

The invention relates to instrumentation technology and can be used in setting up and repairing logic electronics. The purpose of the invention is to expand the functionality of the device. The logic probe contains a sonic generator 4, a sound indicator 10, a probe 1, a resistor 2, two frequency dividers 5.6, elements EXCLUSIVE 1 or 3 and И-Ш1И 8, reset circuit 9 for power supply and trigger 7. Introduction of an additional element AND - OR 8, frequency divider 6, power supply reset element 9 and RS flip-flop 7 allowed to clearly identify the level of the logical unit, the logical zero and Obregge by hearing the frequency, In addition, by combining the operation of the power supply voltage. removing the working signal when the probe is in contact 1 with the object of control, it becomes possible to distinguish the state of Obry from the power supply not turned on. 1 il. SS (L

Description

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The invention relates to instrumentation engineering and can be used in the adjustment and repair of logic electronic circuits.

The purpose of the invention is to expand the functionality of the logic probe and the tsalichi on the Obryu state probe.

The drawing shows the functional circuit of the logic probe.

Logic probe contains a probe resistor 2, the element EXCLUSIVE OR 3, sound generator 4, the first second dividers 5, 6 frequencies, RS-trigger 7, the element AND-OR 8, the element 9 reset, the sound indicator 10.

The probe 1 is connected to the S-input of the splitter 5 frequency, with parvm input and h

4 with the frequency divided by the 6 frequency divider, arrives at both inputs of the EXCLUSIVE OR 3 element. As a result, at its output a low logic level and, therefore,. RS flip-flop 7 remains in the zero state and frequency divider 5 does not work.

If level 1 is fed to probe 1, then pulses from the & frequencies arrive only at the second input of the EXCLUSIVE OR 3 element and from its output arrive at the first input of the I-ШШ 8 element, at the second input of which there is a resolving potential from the output of the frequency divider 5, supported by the signal coming from the probe 1 to the input of the frequency divider 5 .

rez resistor 2 nd second input ele-20 In addition, the pulses from the output of the element EXCLUSIVE OR 3, S-input of the RS flip-flop 7, with the first input of the element AND-OR 8 and C-input of the frequency divider 5, the output of which is connected to

EXCLUSIVE RSHI 3 is set to 1 RS-flip-flop 7, thereby blocking the output of sound pulses from the sonic indicator W from the sonic generator, input of the AND-OR element 8, track 25 A, t, e, when I for 1 frequency

sound lower than when it turned out

If the O level is applied to the probe 1, the frequency divider 5 will divide the frequency of the pulses arriving at its counting input. From the output of the frequency divider 5, the second input of the AND-OR element 8 will receive an enabling potential, during which time the frequency divider pulses will come to the sound indicator 10. As in the previous case,

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the second input of which is connected to the output of the sound generator 4 and through the frequency divider b to the second input of the EXCLUSIVE OR 3 element, the output of the reset element 9 is connected to the R input:, RS of the flip-flop 7, the inverse output of which is OR 8, the output of which is connected to the sound indicator 10.

Logical probe works as follows.

If there is no contact with the probe 1 of the control object, the logic probe circuit is de-energized and the audible indicator 10 does not signal.

When the probe 1 is pressed on a contact, its contact rod, in addition to transmitting an electrical signal, performs a mechanical circuit-microswitch through which power is supplied to the probe circuit.

If the probe is fed to the probe 1, then the pulses from the sound generator 4 through the element AND-OR 8 are fed to the input of the sound indicator 0, which gives a signal with the frequency of the sound generator 4. The condition of the pulses passing from the sound generator 4 is a high logic level an inverse output of the RS-flip-flop 7, which is set to the zero state from the reset element 9 when it is applied to its supply voltage. The pulses of the sound generator-trigger 7 are set to 1, blocking the sound indicator 10 pulses with the frequency of the sound generator 4, as a result, an intermittent sound will be heard indicating the level O at the probe input.

Thus, according to the frequency of 45

sound indicator can be II, II .. llnti

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1 and O

By combining the operations of supplying voltage and removing the working signal when the probe 1 is in contact with the test object, it becomes possible to distinguish the state of the Open circuit from the non-switched on supply.

Claims (1)

Invention Formula A logic probe containing a sound generator, a sound indicator connected to the S input of the first frequency divider, with the first input and The mentor EXCLUSIVE RSH 3 is set to 1 RS-flip-flop 7, thereby blocking the output to the audio indicator W of the pulses from the sound generator I 91 0 RS-trigger 7 is set to 1, blocking 10 pulses on the audio indicator with a frequency of 4 oscillators. As a result, an intermittent sound will be heard indicating the level O at the probe input. Thus, by frequency sound indicator can be II, II .. llnti i lick the state 1 and O By combining the operations of supplying voltage and removing the working signal when the probe 1 is in contact with the test object, it becomes possible to distinguish the state of the Open circuit from the non-switched on supply. Invention Formula A logic probe containing a sound generator, a sound indicator connected to the S input of the first frequency divider, with the first input and  1448315 through the re istor - from the second input to the ele-first input of the element AND-OR, EXACTLY EXECUTIVE) ORTINGER, the output of which the Swarm whose input is connected to the output is connected to the C input of the first Delhi-DOM of the sound generator and Distinguishing-second frequency divider - with the second one so that, in order to expand the input element of the EXCITER OR, you have the second frequency divider, RS-trigger and the third input of the trigger connected to the S input. RS trigger, an AND-OR element, an AND-OR element, the output of which is connected to a reset on power-up, the output with an audible indicator, the output of the first one is connected to the R-input of the RS-th frequency divider is connected to the even-flip-flop, the output of which is connected by the coiled input of the AND-OR element.