SU811158A1 - Digital instanteneous value phase meter - Google Patents

Description

switch 7, and the switch outputs to the inputs of the microprocessor 8. The outputs of the microprocessor are connected to the inputs of the display unit 9, the outputs of the control unit 10 to the control terminals of the unit 1, the switch, the microprocessor, the display unit.

The device works as follows.

Block 1 turns on the key 2 for the time Tx, which supplies the generator 5 pulses to the counter 5. On the counter 5, a number proportional to Tx is recorded. Block 1 turns on the key 3 for a time equal to the phase shift φ, which transmits to the counter 6 pulses of the generator 4 during this time. On counter 6, a number proportional to ph is recorded. At the command of block 10, switch 7 enters into the microprocessor 8 a number from counter 6 proportional to fj. The next command from block 10 enters the microprocessor and enters into it that the entered number proportional to fzh must be divided into the next entered number that The number from counter 5 is proportional to Tx. This number is entered using the following command, which enters the switch and microprocessor. The switch connects to the microprocessor counter 5 and enters the required number. After that, the microprocessor receives a command from block 10, performing the division operation. The microprocessor performs the calculation

F

---, After calculation time in internalTX

The result of the calculation appears in the microprocessor register, after which block 10 enters the command "multiply and the number" 360 into the microprocessor. Then, from block 10 a command is sent to the microprocessor, performing the multiplication operation. The microprocessor calculates the phase shift

Wed-J.360

and submits the result to block 9, which indicates it. If the mode of the device is not cyclical, no further changes occur. If the mode is cyclic, the next command from control unit 10 is sent to block 1, allowing its operation, and the cycle is repeated.

The processing time of the result does not depend on either Tx or the VF and is Tmp - the delay necessary for the operation of the microprocessor. Thus, the time of one measurement

ism - X T mp

In the proposed device, the time 4zm with increasing signal frequency does not remain constant, as in the prototype, but even decreases, since Tx Tmp-Since Tmp does not depend on the number of bits of the number of fj,

it is possible at the same measurement time to increase the frequency of the reference oscillator and, thereby, to improve the measurement accuracy f.

The use of the invention allows, while reducing the measurement time of the instantaneous phase value, to simplify the circuit of the device, increase its accuracy and expand the frequency range of the signals under study.

Claims (1)

Invention Formula An instantaneous digital phase meter containing a signal conditioning unit, two keys whose inputs are connected to its output, a reference voltage generator connected to the second key inputs, period and phase shift counters, whose inputs are connected to the key outputs, and a display unit that differs in order to increase measurement accuracy; a control unit connected in series, a switch and a microprocessor, the output of which is connected to the input of the control unit, are inserted into it; the meter outputs are connected to the second inputs of the switch, the output of the microprocessor is connected to the input of the display unit, and the outputs of the control unit are connected to the inputs of the control of the signal conditioning unit, the switch, the microprocessor and the display unit. The source of information taken into account in the examination USSR Author's Certificate N ° 441523, cl. G OSH 25/00, 1973.