SU659978A1 - Electronic counting frequency meter - Google Patents

Description

3

the second output of the strobe pulse shaper, the pulse counter output and the census pulse shaper output are connected to the memory and display unit inputs, enter the additional reset pulse shaper and the display time signal switch, the input of which is connected to the second output of the frequency division unit, and the output is the third input of the time signal generator of the indication. At the same time, the LT, optical driver of the reset pulses is connected between the first output of the strobe pulse former and the second input of the frequency deletion block.

Structural electrical circuit of the frequency meter described in the drawing and drawing.

The frequency meter contains a time selector 1, a counter of 2 emulsions, a block 3 of the meter and indications, a gate pulse shaper 4, a census pulse shaper 5, an indication time signal shaper 6, a reset pulse shaper 7, a count time signal switch 8, additional shaper 10 reset pulses, switch AND time signal display. Measured signal; served on input 12.

The principle of operation of the device is as follows.

When measuring the frequency or period, one of the time selector 1 inputs the generated strobe-nmiuls, and the other input - the pulses of the measured frequency or the pulses of the reference oscillator. From the time series output 1 of sector 1, a packet of pulses is removed and fed into counter 2. The state of counter 2 is pulsed and indicated by unit 3 of this type and indication. At the end of the strobe pulse, the shaper of 5 pulse of re-pulse and shaper 6 of the indication time signal are started. At the end of the indication time, the shaper 7 of the reset pulse is reset, and the device is reset.

At the end of the strobe pulse, the start of the donor forwarder 10 reset pulses, which generates a pulse, sets the frequency division block 9 to the "9" or to any other state when using a frequency dividers with a variable division factor. From the output of the switch 11 of the indication time signal, the pulses are triggered, triggering the imaging timing signal generator 6, made, nairnmer, on two triggers. In the down state, the driver 6 is set by a reset pulse removed from the driver 7.

The total display time of the device is determined by the expression

t, 2t ,, t, + 2i, + t ,.

four

/ 1 delayed response;

where / 2 is the display time; / 3 pulse duration reset; tc.4 - strobe pulse duration; t - duration

pulse reset. Usually. and but so

.

Since the forma tion of the time signals of the display is carried out with the help of pulses taken through the switch I from the frequency dividing unit 9, the spread of the display time in the device is determined only by the frequency instability of the reference oscillator (internal or external).

The time / 2 ndicacin is rigidly and rotated to the strobe-pulse phase, which ensures the synchronization of the measuring cycle.

Remote control by the switch 11 of the timing signal can be carried out in the same way as it is done for the switch 8 of the counting time signal, or by means of code messages in the case of using the frequency dividing unit 9 with a temporal dividing factor.

F o rmly inventions

Electron-counting frequency meter containing a time selector, one input of which is connected to the first output of the strobe pulse former, and the output of the time selector is connected to the input of a pulse counter, the second input of which is connected to the second output of the strobe pulse former, the third and fourth outputs of which are connected to the inputs of the census pulse generator and the display time signal generator, and the input

The strobe pulse generator is connected via a counting time switch to the first output of the frequency division unit; pulses and output

Pmix generator and dubbing to memory and nndkatsni unit inputs, characterized in that, in order to improve measurement accuracy, a shaper pulse generator and an indication time signal switch, the input of which is connected to the second output of the frequency division unit, are added, and the output of the additional switch the indication time signal is connected to the third input of the indication time signal generator, and the additional shaper of reset pulses is connected between the first output of the shaper pulse and a second input dividing unit

frequencies.

Sources of information taken into account during the examination 1. USSR Author's Certificate No. 40823, cl. G 01R 23/10, 1972.

2. US Patent L 3842347, cl. 32478D, publ. 1973.

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