SU103175A1 - Measuring electronic generator of electrical oscillations - Google Patents

Description

Existing frequency-measuring devices using interpolation generators do not provide a sufficiently high measurement accuracy. One of the factors limiting the possibility of improving the accuracy of measurements is the error in the reference frequency of the oscillator scale. In the described generator, these shortcomings are eliminated by using two tuning elements having separate scales and adjustment elements that are interconnected.

In the proposed generator, the oscillating circuit is adjusted by changing the capacitance of the capacitor and the inductance of the coil. The variable capacitor covers the entire frequency range of the generator and has divisions corresponding to a specific unit of measurement (naimer, 1 kHz). The coil variable in, t; uktivnosti, with the help of which the frequency is changed within one division of the scale of the capacitor, has a scale with divisions corresponding to the SHARE units of the scale of the capacitor (for example, 1 Hz).

The capacitor is tuned to a quartz-stabilized reference oscillator using an oscilloscope OR another electronic indicator.

As is well known, with small inductance changes, the ratio

,

 L

From which it follows that in order to provide the same frequency change with the help of an inductance in the required frequency range, it is necessary to change the value according to the diagonal range. To do this, in the proposed generator, along with a change in the capacitance of the alternating capacitor, which determines the frequency range of the generator, control of prediadeles of change in magnitude is performed.

This means that the frequency changes due to the change remain the same for all diaiazone.

To provide the same frequency change by one division of the inductance scale, the magnitude of the inductance change by one division of the scale varies depending on the position of the capacitor tuning element.

The proposed wide-ranging generator scales makes it impossible to directly read the frequency and improve measurement accuracy. This is achieved by using a fixed capacitor for tuning the generator, the scale of which does not overlap the entire frequency range of the generator, and the variable inductance coil with a scale overlapping one capacitor scale division, and in order to ensure that the inductance scale is maintained over the entire frequency range of the generator inductance on one division of its I1kala from the position of the body tuning capacitor.

Subject invention

Measuring electronic generator of electrical oscillations, containing an oscillating circuit, tunable output 103175 2 -

capacitance and inductive capacitor, 1 ksch), and the coil scale, the coil's non-reproducibility. using the support-one division of the scale of the condensate quartz oscillator for calibration, has divisions corresponding to

scales, about tl and h and y; and and with that, the units of the scale of the capacitor (for example,

in order to reduce the error of 1 hz), and the tuning unit of the coil of the oscillator frequency, the scale is condensed with the tuning body of the capacitor and it overlaps the entire frequency range, such that the graduation of the scale of the carator and the corresponding guns remain unchanged on any part of the unit of measurement ( - line capacitor scale.