Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1982-09-14
1985-08-20
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
G01R 1320
Patent
active
045367078
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for displaying one or more measurement values of arbitrary measurement variables on the screen of a video display terminal (VDT), especially a color VDT, which operates by the line-scanning process. In the method according to the invention, line-frequency and frame-frequency signals are generated in a synchronizing pulse generator.
Methods for displaying measurement values and curves on the screens of VDTs are known. In a known apparatus, before beginning the display of the individual measurement or curve points in a given line, the measurement values to be displayed in this line are fed into an output register of a frame repetition memory. While the electron beam is scanning the screen, a frame counter is counted up with clock pulses until it has attained the measurement value stored in the output register. A picture element is then generated on the screen. Only one measurement value can be displayed in each line (German Laid-Open Application No. 1 808 245).
Based on this apparatus, a method is known with which measurement values can be displayed, the ordinate of which is perpendicular to the line direction and the abscissa of which extends in the same direction as the lines. To this end, the measurement values are transferred out of the frame repetition memory, as each line is scanned, in the order in which they are displayed (depending on the line direction). The measurement value which is to be displayed closest to the edge of the image field, depending on the line direction, is the first to be transferred out after each line return, and the measurement values are transferred out at an interval between lines such that from the transfer of one measurement value onto the screen until the transfer of the next, the electron beam travels a distance which is equal to the smallest interval between picture elements in the line direction. The transferred measurement values are compared with the negated state of a line counter, or the negated transferred measurement value is compared with the state of the line counter, and in the case of equality a signal is emitted (German Examined Application No. 2 149 636). A selective display of a curve from bottom to top or from left to right cannot be accomplished. Although in principle it is possible to rotate the deflection coil of the VDT by 90.degree., conventional VDTs could not then be used. The need frequently exists to display a relatively great number of measurement values clearly and simultaneously, and threshold values and/or actual and set-point values may also need to be shown at the same time.
It is accordingly the object of the invention to provide a method and an apparatus of the type discussed at the outset, such that one or more measurement values can be displayed selectively in a simple manner, horizontally or vertically and from top to bottom or from left to right with respect to the screen. Particularly when a color VDT is used, the various measurement values are displayed in different colors, depending upon whether they exceed a threshold value. The method is intended to enable easy adaptability to given measurement tasks and should enable the storage of measurement values in memory.
This object is attained according to the invention, in a method of the general type discussed at the outset, substantially in that a measurement voltage corresponding to a measurement variable is formed, then is first standardized and then supplied to an adding amplifier to which a sawtooth voltage is also supplied; that the sawtooth voltage is synchronized by the frame-frequency or line-frequency pulses; and the output voltage of the adding amplifier is supplied to a threshold switch, which if the threshold is exceeded by the summed voltage emits a time-proportional signal; that the signal proportional to the measurement voltage is delivered to a subsequent gate circuit which is synchronized with the line-frequency or frame-frequency pulses and, after adaptation of the level and mixing of the synchronizing pulses, is furnished as a video
REFERENCES:
patent: 2591738 (1952-04-01), Spencer
patent: 3739222 (1973-06-01), Hurd, III
patent: 3786476 (1974-01-01), Graves et al.
patent: 4307393 (1981-12-01), Hamada et al.
Baker Stephen M.
Levy Stewart J.
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