SU1648374A1 - Device for testing chronoreflexometers - Google Patents

Abstract

The invention relates to the means of metrological assurance of chronoreflexometers and can be used as a model tool during calibration and certification work. The purpose of the invention is to improve the performance of the device. The device contains acoustic and light signal transducers connected to the input of the measuring amplifier, an adjustable comparator connected in series, an adjustable time interval playback unit, and a reaction shaping unit, the comparator output being connected to the output of the measuring amplifier. 2 Il.

Description

The invention relates to means of metrological provision of medical equipment, in particular chronoreflexometers, and can be used as an exemplary tool in the production of calibration and attestation works.

The purpose of the invention is to improve the performance of the device.

The functional diagram of the device for calibration of the chronoreflexometer is shown in FIG. one; in fig. 2 - time diagram.

The proposed device contains primary transducers (PP) 1 and 2 of acoustic and light signals, a measuring amplifier 3, an adjustable comparator 4, an adjustable time interval playback unit 5, and a reaction generation unit 6. The latter includes the shaper 7 of the acoustic signal, the shaper 8 of the signal

galvanic skin response, shaper 9 motor reaction.

To test in the mode of sound stimulation (see Fig. 2a), the signal from acoustic transducer 1 is amplified and starts comparator 4, which is triggered when the threshold value pre-set in order to avoid interference due to acoustic background is exceeded. From the output of the comparator 4, a working pulse (see Fig. 26) starts block 5. In the latter, a fixed value of the TO response time is set (see Fig. 2c). The driving pulse is moved to this value along the time axis. Block 7 generates the corresponding reaction of the acoustic signal (see Fig. 2d), the potential of the GSR (see Fig. 2e). motor reaction - key closure (see Fig. 2e). FIG. 2g shows, respectively, start-up and end-of-counting pulse pulses.

00

s h

four

The absolute error in the above procedure is determined by

T Ti - That, (1)

where T0 is the reaction time value set by the device for reproducing time intervals of 5 ms;

T - the value of the reaction time measured by the chronoreflexometer, ms.

The proposed device, implemented in the form of a prototype, is certified in the organization of the applicant.

As PP1 and PP2 were used:

PP 1 - exemplary KOS-1 acoustic transducer; PP 2 - photometric converter FEU-02-24.

Unit 8 is the KGR-01 unit, unit 7 is any acoustic generator, for example, Brüel and Kj Юr Yu23 generator.

The device provides reproduction of reaction time intervals in the range of 50-700 ms with fixed values with a reproduction error of no worse than ± 10 s,

The calibration time is shortened by more than 5 times compared with the element-by-element calibration.

Claims (1)

Invention Formula A device for calibrating chrono-reflectometers, containing primary transducers of acoustic and light signals, the outputs of which are connected to the inputs of a measuring amplifier, which are different in that, in order to improve the performance of the device, sequentially coupled adjustable comparator, an adjustable playback unit, are introduced into it time intervals and a reaction shaping unit containing an acoustic signal shaper, a galvanic skin response shaper, and a motor reactions whose outputs are the outputs of the device, and the inputs are combined and are the input of the reaction shaping unit, the input of the comparator is connected to the output of the measuring amplifier. % // J %/four & R   b