SU439760A1 - Light beam oscilloscope - Google Patents

Description

one

Light beam oscilloscopes are known that contain galvanometers installed in a magnetic unit, galvanometric transducers, and sources of direct current.

A disadvantage of the known oscilloscopes is the impossibility of carrying out amplitude-frequency analysis of the signal under investigation in one device while simultaneously recording the results of the analysis.

To perform the amplitude-frequency analysis of the 10th analysis, the proposed oscilloscope is equipped with a logometer installed in a magnetic magnetic field, whose measuring frames are connected in series to a series whose input is connected to the output potential: m of a magnetically sensitive element of a galvanic functional transmitter; the product is operated, the current leads and the key are connected to the signal under study, and the frame of the mentioned converter is connected to the series-connected potential leads of a magnetically sensitive element and an opposing frame of a galvaiometric function transducer performing a square root extraction operation; With this, the current outputs of the last transducer are connected to a direct current source, and the measuring frame is connected to successively connected opposing frames of a co-lomeroma for example, via / C is a chain.

The drawing shows a diagram of the described oscilloscope, where 1, 2 is a source of direct current; 3-b - resistor; 7 - the switch; 8 - capacity; 9 - magnetoelectric galvanometric 4UN ZION. These are the first converter (HFP), which makes it possible to test square root; 10 - measuring frame; 11 is a counter frame; 12 - magnet sensitive element (Hall sensor); 13 - potential conclusions; 14 - current outputs; 15 - HFN performing a product operation; 6 - frame; 17 - magnetically sensitive element; 18 - potential conclusions; 19 - current leads; 20 - clamps; 21, 22 — logometers (oscillographic galvanometers with a smoothly varying frequency); 23 - measuring frame; 24 is a counter frame.

A HFP 9, HFP 15, logometers 21, 22 are installed in the magnetic block of the light-beam oscilloscope.

The analyzed signal U. is supplied and clamps 20 connected to the current terminals 19 of the HFP sensor 15. The potential terminals 18 of the sensor are connected to serially connected measuring frames of the gauges 21, 22 with different natural frequency and degree of calm less than 0.1. Frame 16 of HFP 15 with a rigidly attached sensor is suspended on extensions and placed in a uniform magnetic field. The frame pins are connected to the open circuit of a series-connected potential output 13 of the Hall sensor and a counter pin; the frame HU and HFP 9. The current leads 14 of the HFP 9 are connected to the DC source 2 in the corresponding polarity, and the measuring frame 10 is connected to the series-connected opposing frames logometers 21, 22, connected, in turn, to the second source of direct current 1 through the .RC chain (3, 4, 8) and the switch 7.

The number of logometers and their parameters are determined by the range of frequencies studied, as well as the relative change in current i in the opposing framework.

So, if the value of current i is changed by a factor of k, the discrete number of logometers should differ by their own frequency. The voltage Onzm on the measuring range of a logometer 21, 22, taken from the potential terminals 18 of the HFP sensor 15, is described by the expression:

(Nzm - t.

where 1 „-current entering the frame of the GUF 15.

The current flowing into the frames of the logometers 21, 22, when calibrated, is equal to i., O. With this current, we determine the own frequency foi, / 02 of the logometers 21, 22 and the deviation of the HFP 15 flare on the scale of the oscilloscope. When the current i is changed by k times, the natural frequency of the logometers changes zY k times.

Consider how the flare deflection and the current 1 "will change.

The equilibrium position of the HFP 9 system is determined by the relation:

(2)

, o-:

R

e 6, „/ Sd Od a-voltage of the Hall at the terminals 13 of the Hall sensor HFP 9;

, 2 - plausibility of measuring and opposing frames; and - the angle of rotation of the frame; / SD - proportionality coefficient;

R is the total resistance of the framework.

Substituting U ,,,, into expression (2) and drive the corresponding transformations,

we will receive:

/

one

(3) U-,

where P is the proportionality coefficient.

Substituting expression (3) into expression 10 (2) and producing the corresponding transformations, we get:

Ihn r

Y

ki

(four)

Pb of expression (4) shows that the current i is proportional. Resistances 3 and 4 are selected so that the current in the opposing framework 24 is i.

When the switch 7 is turned on, the current i starts to change k times. The current rise time ki is determined by the RC chain (3, 8).

If one of the harmonics of the signal under study coincides with the natural frequency of the meter in the process of changing the current ki, then on the scale a sharp increase occurs in the blurring of the flare on the scale of the oscilloscope.

Subject invention

A light beam oscilloscope containing galvanometers installed in a magnetic unit, galvanometric transducers and sources of constant current, characterized in that, in order to carry out amplitude-frequency analysis, it is equipped with log Meters installed in a magnetic unit, the measuring frames of which are connected in series to form the input of which is connected to a note of the terminals of the mag: nl u in the TV is the final element of this type of the mi o m m ric rich functional converter performing the operation of the product, current pins connected to the signal under study, and the frame of said transducer is connected to series-connected potential pins of the magnetically sensitive element and the counter frame of the galvanometric function transducer performing the square root operation, while the current pins of the last transducer are connected to the source and current current from the frame - to series-connected opposing logometers connected to the second source DC | 11iku direct current, for example, through the / C-chain.