Logic probe for static and dynamic modes. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The logic probe for static and dynamic modes allows you to check the logic levels on the outputs of digital circuits and determine whether the frequency of the pulses applied to the input of the probe is above or below 25 Hz.
In the absence of a signal at the input of the element D1.1, a low logic level, at the inputs D1.2 - D1.4 - high. Indicator segments do not light up.
If the input of the probe receives a level corresponding to logical "1", the output of element D1.1 will be logical "0", the output of D1.2 will be logical "1", elements D1.3 and D1.4 remain in their original state. In this case, segments b and c light up and the number "1" is displayed. When there is a logical "0" at the probe input, a high logic level will appear at the output of the elements D1.2-D1.4 and segments a, b, c, d, e and f will be lit, i.e. "0" will be displayed.
When pulses with a frequency of up to 25 Hz are applied to the input of the probe, the alternation of the numbers "0" and "1" on the indicator can be distinguished, at frequencies above 25 Hz, the influence of the capacitor C1 begins to affect. As a result, the brightness of the segment d glow sharply decreases and the letter P is displayed, which means the presence of pulses with a relatively high frequency at the probe input.
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