SU447629A1 - Pulse Transmitter Measuring Converter - Google Patents

Description

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The invention relates to instrumentation, namely, devices for digitally measuring electrically measured values.

The following post converters are known. current (voltage) to the frequency of the follow- ing 5: of the pulses or the duration of the pulses .:; The main elements of these converters are the integrating capacitor, the source of the current being converted, the source: the reference current, the source of the reference direction, the key circuit, the comparison element, and the release circuit.

However, voltage converters (TOKaJS to pulse frequency at maximum speed and stable operation: over the entire conversion range, the non-linear dependence of the time intervals between pulses on current.,

i Current transducers (voltages) to aliasing pulses have a linear dependence of the time interval on the current, but I have low speed and are only stable up to half of the conversion range.

The purpose of the invention is to obtain the linear interdependence of the time intervals between the rear 4 rut of the current and the leading edge, the volume of the subsequent pulses from the converted current at maximum speed and high stability.

To do this, in the proposed device, the source of the converted current is connected to the integrated capacitor through an additional key circuit, the control input of which is connected to the output of the one-shot.

The drawing shows a functional diagram of the proposed Converter.

The converter contains the sources of the current 1 and the reference current 2 ,; the main key circuit 3, the integrating capacitor 4, the source of the reference voltage 5, a comparing element b - one Navigator 7 and an additional key circuit 8

iCTBio works as follows. When the main key circuit 3 is on, the additional key circuit 8 is turned off. In this case, the source current of the reference current 2 tends to charge