SU386252A1 - DIGITAL MEASURING DEVICE - Google Patents

Description

one

The invention relates to the field of measurement technology.

Digital measuring instruments are known, which contain an operation type switch connected to the signal generator of the measured parameter, a Hall sensor switch and a scale converter, and a control unit connected to the measurement limit switch and to the series-connected voltage converter in a time interval, counter and digital display. In the known devices, ensuring a given measurement accuracy is fraught with significant difficulties, since it requires a number of intermediate manual switches.

To simplify the measurement process without reducing its accuracy, a trigger with a counting input connected between the control unit and the Hall sensor switch, an overload indicator light and a trigger with separate inputs, one of which is connected to the counter, are introduced into the device.

In the drawing, an image of a variant of the described device.

The converter / induction magnetic field to voltage consists of a Hall sensor 2, an automatic switch 3 and a current stabilizer 4. Conclusions 5, 6, 7 and 8 of sensor 2

Halls are connected via switch 3 to the current stabilizer 4 and to switch 9 of the work type. The shaper 10 of the measured parameter signal connected to the input terminal 11 is also connected to the switch 9. The switch 9 is connected via a scale converter 12 and a voltage converter 13 to a counter 14 connected to a digital indicator 15. Scale sensor 12 inputs connected directly and through the measurement limit switch 16 to the control unit 17, which is connected via trigger 18 to the counting input: to switch 3. Block 17 is also connected to the inputs of the converter 13, counting ika 14 .indikatora 15 and latch 19. The other input of the flip-flop 19 is connected to the counter il4, while the output - to the light indicator 20 eegruzki ne. The device works as follows.

When measuring the magnetic field, the voltage is proportional to it through non-switches 3 to 9 and converter 12 to converter 13. In the latter, this voltage is converted into a sequence of pulses fed to counter 14, which remembers their number. The voltage measurement is performed in two states of the switch 3, the change of which is carried out through the trigger 18 by the control unit 17. in the first state of the switch 3, the scale converter J2 is supplied with voltage from the terminals 5 to 6 of the Hall sensor 2, and in the second state from the terminals 7 to 8. The addition of the measurement results produced in the two states of the switch 3 allows eliminate the "equipotential stress" arising from the use of Hall sensor 2. Overload control - in the measurement process is performed by means of the indicator 20.

When measuring other parameters, such as voltage (voltage, current, resistance or capacitance), a signal proportional to the parameter being measured is fed to a large-scale converter of 2 from the driver 10.

The described device allows not only to simplify the measurement process, but also to significantly accelerate it by eliminating manual operations.

Subject invention

A digital measuring instrument containing a work switch, associated with a measured parameter driver, a Hall sensor switch and a scale converter, and a YnpaiSlen unit connected to a measurement limit switch and to a serially connected time converter, counter, and digital an indicator, characterized in that, in order to simplify the measurement process without reducing its accuracy, a trigger with a countable

an input connected between the control unit and the Hall sensor switch, an overload indicator light and a trigger connected to it with separate inputs, one of which is connected to the counter.