SU496507A2 - Phase meter - Google Patents

Description

one

The invention relates to a measurement technique and is intended to measure a phase shift between two electrical signals in a wide dynamic range.

By bus 41POZZO is known for a multiple phase meter with extended measurement limits, operating on the principle of overlap. However, the operation of such a phase meter is unreliable (it is not set to zero) if the sequence of pulses arriving at the inputs of tripnier dividers of a clock is violated.

In order to increase the reliability of measurement, the phase meter is equipped with a range of pulse order control, connected between the pulse shaper and the trigger frequency dividers of the signals. In addition, the control device1: is equipped with four coincidence circuits, an inverter and two m}) iggers, with one of the inputs of the first coincidence circuit connected to the input of the inverter, the output of which is connected to the first input of T1.) respectively connected: 110 |) the output of the nepBOJo and the second trig

The second output of the first trigger is connected to the second input of the first and third inputs of the fourth matching circuit, the second output of the second trigger is connected to the second of the inputs of the second matching circuit.

The drawing is a phase diagram. meter

It contains trigger pieces of 1 frequency in the reference and measuring channels, connected through switch 2 to the key circuit 3 and through a control unit 4 for pulses 4, control device 4 consists of an inverter 6, TPIIJ 7 and 8 and the four matching schemes Q-12. The matching scheme 9 is a nepiibiM valve, and the 1O matching scheme is in-1O) a gate for input signals. The outputs of the flip-flops 7 and 8 are connected to the inputs of the coincidence circuits, and the counting inputs of the triggers are connected to the outputs of the coincidence circuits 1J and 1 2. The last inputs are also connected via inverter 6 to the input of the gate 9. Fazgk. The meter works as follows. On the go of the pulse shaper 5 do not

discontinuous signals, such as harmonics, between which the phase shift is measured. In the former, these signals are converted into periodic sequences of pulses received through coincidence circuits 9 and 10 (if they are open) to trigger frequency dividers 1, where the frequency of the signals is divided by a factor of 2 (PT 1, 2, 3). From the outputs of the frequency dividers, the pulses through switch 2 enter the key circuit, AND, 3. The width of the pulses at its output depends on the measured phase shift. The zero phase difference corresponds to the zero of the phase meter, and the pulse width is equal to a quarter of the period 15 they follow.

For proper control of the pulse sequence, the reference signal is fed through the circuits 9 of the control device 4.

The control of the order of the pulses is as follows. When a reset voltage is applied, the triggers 7 and 8 are reset, characterized by the presence of a zero level on the left shoulders and a single level on the 25 right shoulders. By virtue of this coincidence scheme, 9 and 10 are closed for the passage

input signals until the coincidence circuit 9 receives a single level from trigger 7, and the coincidence circuit 30 1O - a single level from trigger 8. Elements are in the initial state until after the termination supply voltage reset does not come the first reference impulse. The falling edge of the inverter 35, which creates a triggering voltage jump, and the coincidence circuit 11, the phase meter switches the control trigger 7, which in turn shunts the coincidence circuit 11, opens the coincidence circuit 9 and prepares the coincidence circuit 12 The second reference pulse passes directly through the coincidence circuit to the frequency divider, the reference channel, and through the inverter 6 and 5

The schema of the matches 12 switches the control trigger 8. The latter, in turn, i shunts in the control unit the coincidence circuit 12 and opens the coincidence circuit 1O of the measuring channel, through which the pulses of the measuring signal to the frequency divider arrive. Due to the shunting of the circuits 11 and 12, the subsequent reference pulses do not switch control triggers 7 and 8.

Thus, the control device. ensures the passage of pulses to triggers of frequency dividers in a pre-coherent sequence. This gives the correctness of the phase-time relations at the output of the phase meter, i.e., the change in the duration of the output pulse

Circuits And always proportional to the phase shift between the input signals.

Claims (2)

1. Phase meter by aut. St. No. 41POZZO, characterized in that, for the purpose . to increase measurement reliability, the OHI is equipped with a pulse order control device connected between the pulse shaper and the trigger frequency dividers of the signal. 2. Phase meter according to claim 1, which is also distinguished by the fact that the control device the pulse sequence is performed by four coincidence circuits, an inverter and two triggers, one of the inputs of the first coincidence circuit is connected to the input of the inverter, the output of which is connected to the first input of the third and fourth coincidence circuit, their second inputs are connected respectively to the first outputs of the first and the second trigger, the second output of the first trigger is connected to the second input of the first and the third input of the fourth coincidence circuit, the second output of the second trigger is connected to one of the inputs of the second coincidence circuit . P // I Sh n, 2 QOOO xIf 2 " t Ll 9OOC IT I I