SU401925A1 - DEVICE FOR SWITCHING RANGE SCORDS - Google Patents

Description

This invention relates to a measurement technique, namely, an oscillographic device.

A device is known for switching the sweep ranges of an oscilloscope by commuting the time of the driving / C-circuits of the sweep generator, comprising a bandpass filter unit and an automatic sweep range selection unit.

The purpose of the invention is to improve the accuracy of switching.

The proposed device is characterized in that the automatic scanning range selection unit is implemented in the form of a multi-channel logic circuit, each channel of which includes an amplifier-limiter, a matching and anti-matching circuit, a counter and a multi-input matching circuit.

The block diagram of the described device is shown in the drawing.

The device contains a bandpass filter unit 1, a unit 2 for automatically selecting a sweep range with a switching unit 3. A unit for automatically selecting a sweep range is made in the form of a multichannel diode comparison circuit, each of the channels of which includes a diode comparison circuit 4-6 consisting of diodes 7- 9 and transistor 10. Logic circuits 11-13 are included in the channels of the switching unit.

2

the composition of the logic circuit includes amplifier delimiter 14, coincidence circuit 15, anti-coincidence circuit 16, counter 17, multiple input coincidence circuit 18, the signal with which

is fed to a switch 19 of the C-circuit of the sweep generator (not shown).

A clock frequency generator 20 is connected to the second inputs of the matching and anti-matching circuits.

The signal under study is fed to the input of the filter bank 1, which consists of L bandpass filters (not shown), each of which has a certain bandwidth. The number of filters is determined by the number of selected sweep ranges. The filter unit decomposes the signal into a number of harmonic component sets defined by the bandwidth of each filter. From the outputs of the filter unit, the signals arrive at

the inputs of block 2, each of the channels of which is a circuit comparing the amplitude of the harmonic components of the signal and selecting the maximum of them. Only one signal is always removed from the output of block 2,

of that channel, the harmonic components in which are currently maximal. This signal is fed to the input of the corresponding limiting amplifier and, further, to the input of the matching circuit. If available at the second entrance

the last pulse from the clock generator

pulses from the output of the coincidence circuit, the pulse is removed, which is fed to the counter, which is the accumulator of a certain number of pulses.

Thus, the counter provides the necessary time delay to avoid false triggering of the switch. The coincidence circuit ensures that the switch operates at full meter capacity. The circuit apts is used to reset the counter to the initial state when the signal disappears on the input of the described channel of block 3 and simultaneously with the appearance of the signal at the input of any other channel.

Subject invention

Device to switch oscilloscope sweep ranges by switching

The time of the reference / C-circuits of the oscilloscope sweep generator, which contains a bandpass filter unit, an automatic sweep range selection unit, characterized in that, in order to increase the switching accuracy, the automatic sweep range selection unit is made in the form of a multichannel amplitude comparison diode circuit, and in the form of a multichannel logic circuit, in each of the channels of which the amplifier-limiter is included, the coincidence and anti-coincidence circuits, the counter and the multi-input coincidence circuit, and inputs of each of the coincidence and anticoincidence circuits coupled to the output of clock generator imnulsov.