SU1522115A1 - Electric measuring and indicating instrument - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used to display information. The purpose of the invention is to improve the accuracy of the display. The device contains a gas-discharge indicator 1, a control unit 2, an anode voltage driver 3, triggers 4.8, a pulse generator 5, a counter 6, a step voltage generator 7, a comparator 9, a shift register 11, element AND 12, element OR 13, frequency divider 14. The purpose of the invention is achieved by introducing a pulse indication mode for an additional indicator cathode. 2 Il.

Description

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The invention relates to electrical measuring equipment and can be used to display information with increased accuracy.

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

FIG. 1 is a diagram of the device} in FIG. 2 - time diagram

The device contains a gas-discharge discrete analog indicator 1, the cathode leads of which are connected to the outputs of control unit 2, and the anode is connected to the output of the anode voltage driver 3, the input of which is connected to the output of the first delay trigger k. The generator output 5 clock pulses is connected to the input of the counter 6 and the generator 7, stepwise sawtooth voltage, trigger, delay 8..

The output of the generator 7 is connected to the first input of the comparator 9, the second input of which is connected to the input bus 10, the output of the comparator 9 is connected to the information input of the shift register 11, the first input of the element 12 and the clock input of the trigger 8, the output of which is connected to the second input element And 12. The output element And 12 is connected to the first input of the element OR 13, the second input of which is connected to the output of the register 11, and the output to the information input of the trigger. The output of the low-order bit of counter 6 is connected to the information input of the trigger Vis and the clock inputs of the control unit 2, the trigger and the register 11. The output Reset of the counter 6 is connected to the inputs Reset the generator 7, block 2 and the input of the frequency divider, the output of which is connected to the trigger trigger input 8. Indicator 1 contains a large amount (usually 100 or 200) closely related. cathodes, which form a discrete-analog light-emitting column.

At the beginning of the light-emitting column, there is a reset cathode having a separate output. The remaining cathodes are combined into three groups. The outputs 15-18 of block 2 are connected respectively to the reset cathode, cathodes 1-3 and

groups.

The device works as follows. A generator of 5 clock pulses generates pulses (Fig. 2a), which are fed to such a generator input.

7, each clock pulse increases the output voltage of the generator 7 by one step (FIG. 26). At the same time, the clock pulses arrive at the input of the counter 6, the pulses from the low-end output of which arrive at the clock input of the unit 2, which converts these pulses to three pulse groups (figs, 2 h, and, k) controlling the cathodes of the indicator 1; In addition, the pulses from the output Reset of the counter 6 (fig, 2d) enter the Reset input of block 2, which forms from them the reset pulses (fig. 2g), and also synchronize the operation of the generator 7, intermittently and drive the generator in the initial state (Figure 26). Thus, each of the cathode control pulses at the outputs 15-18 is appropriate ;;) t two clock pulses and, therefore, two stages of the output voltage of the generator 7, however, to be able to move the gas discharge along all the cathodes of the indicator 1, so that the conversion factor of counter 6 is at least twice the number of cathodes.

Comparator 9 compares the measured voltage U, which is fed to the bus 10 of the device, with the output of the step-sawtooth voltage of the generator 7 and operates at the moment of their equality. The mode of operation of the comparator 9 is chosen in such a way that when triggered, the voltage level at its output changes from low to high (hereafter, low voltage level is designated O, and high 1).

PRI me R 1. Comparator 9 is triggered at time t ,, when an odd sawtooth voltage level is generated at the output of generator 7. In this case, the output of the low-order bit of the counter 6 is 1 (FIG. 2b), which is memorized at the output of the trigger 8 (FIG. 2e, a solid line). As a result, 1 from the output of the comparator 9 passes through the AND 12 element and through the OR 13 element enters the information input. Trigger t, which is transferred to state 1 at the instant of the next pulse at the clock input (Figure 2e, solid line) and through the driver 3 it quenches the anode of the indicator 1. If the device bus 10 goes to 515

V (Fig. 26), the reset cathode and two subsequent cathodes are indicated on the indicator 1.

Example 2. The comparator 9 is triggered at the time tj when the even stage of the sawtooth voltage is formed at the output of the generator 7. In this case, the output of the lower bit of the counter 6 is O (FIG. 2b), which is remembered at the output of the trigger 8 (FIG. , dashed line), and prohibits the passage of 1 from the output of the comparator 9 through the AND 12 element. As a result, 1 and from the output of the comparator 9 passes through the shift register 1-1 and only after that through the OR element 13 enters the information input of the trigger k, which is transferred to state 1 at time about the appearance of the next pulse at the clock input {fig.2e, dashed line) and through the shaper 3 extinguishes the anode of the indicator 1. For example, if the shift register 11 delays the information by two cycles, and the device receives the voltage 10 on the bus 10} ( 26), the reset cathode and four subsequent cathodes are displayed on the indicator 1. In addition, this is low frequency pulses. (2-10 Hz) from the output of the divider 1 is fed to the input of the installation 1 of the trigger 8, as a result of which low-frequency pulses are reproduced at the output of the trigger 8. As a result, the anode is extinguished at the same frequency as in example 1, which means a permanent indication of the reset cathode and the subsequent 1 st and 2 nd cathodes and a variable indication (i.e. flashing with a frequency of 2-10 Hz) of the 3 rd and 4 th cathodes.

When the comparator 9 is triggered at the time of forming some odd degree of sawtooth voltage, a constant indication is performed when the comparator 9 is triggered at the time of forming the next even step of sawtooth voltage

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Claims (1)

the available permanent indication adds the twinkling of two subsequent cathodes, thereby improving the accuracy of the reference information. Invention Formula An electrical indicating instrument containing a discrete-discrete gas-discharge indicator, the cathode leads of which are connected to the outputs of the control unit, and the anode to the output of the anode voltage driver, a clock generator, the output of which is connected to the counter input and the clock input of the step-saw voltage generator. input, the Reset of which is connected to the output Reset of the counter, to the input Reset of the control unit and the input of the frequency divider, the output of the step-saw voltage generator is connected to By the first input of the comparator, the second input of which is connected to the input bus, the first delay trigger, the element I, the output of which is connected to the first input of the OR element, characterized in that, in order to improve the display accuracy, it has additionally introduced WTO.P.OI delay trigger and pv shift bias, the output of which is connected to the second input of the OR element, the comparator output is connected to the information input of the shift register, as well as the clock input of the second delay trigger and the first input of the And element, the second input of which is connected to the output the first delay trigger, the input of the anode voltage driver is connected to the output of the first delay trigger, whose information input is connected to the output of the OR element, the output of the frequency divider is connected to the setup input of the second delay trigger, the information input of which is connected to the output of the lowest bit of the counter and with the clock inputs of the shift register, the first trigger trigger and the control unit.