Brown, Boveri & Cie Ag

Abb Patent Gmbh

Metrawatt Gmbh

Gunter Roppelt

Herbert Ziegler

Robert Kindermann

Werner Haussel

Karl Hochreuther

Siegfried Heinze

Carl W Clever

Horst Hopfner

Herbert Schick

Reinhold Kern

In multimeters having a plurality of input connections there is a danger of the measuring conductors being incorrectly connected in such a manner that the setting of the measurement range switch does not correspond to the input connections to which contact is made. In order to avoid damage which may be caused by making an incorrect contact to the input connections, an electrically and/or mechanically acting disabling device is coupled to the measurement range switch for permitting a disabling of particular input connections. The disabling is carried out in such a manner that contact can always only be made to that input connection for receiving a test signal through the measuring conductors, to which a measurable variable is assigned that corresponds to the measurable variable set with the measurement range switch.

Multimeter with at least three input connections and means for

A method and apparatus for fixing an instantaneous measured value performs the steps of creating measured values as a mean value of a set number of individual measurements, recording sequential measured values after initialization in a cycle determined by a flow control, checking with a control device if a new measured value exceeds a base value and if the difference between the two latest measured values lies within a given limit range, before fixing the respective new measured value, and checking with the control device if the difference between the individual values resulting from the latest two individual measurements lies within the given limit range and if a fixing of the last measured value and/or individual value takes place when the differences between the mean values and the differences between the individual values lie in the respective given limit range.

Method and apparatus for fixing an instantaneous measured value

A digital measuring method an apparatus for displaying quasi-analog measured values performs the steps of displaying a measurement scale and interconnected triggerable indicator segments on a display having a given indicator center distance, representing a measured value to be indicated by the position of the indicator segments, controlling the resolution of the quasi-analog measured value display in dependence of the number of indicator segments triggerable within a measurement period to be represented, setting the resolution substantially lower than a resolution with which an A/D converter connected to the display operates, and subjecting a control command for triggering an actual indicator segment to a hysteresis, which assures that a switchover from a previous indicator segment to an actual indicator segmet does not take place until the actual measured value has increased or decreased by substantially more than one-half the given indicator center distance.

Digital measuring method and apparatus for a quasi-analog measured value

A digital measuring device for a quasi-analog measurement value indication includes a display for the measurement value indication, a pre-determined overall measuring range disposed on the display, a measurement value scale forming a spread measuring range section of the overall measuring range with variable spreading, the measuring value scale being addressable in planar segments with alpha numeric characters, an indicating device for indicating a value on the measuring value scale, and an automatic control placing measurement values within the displayed measuring range section with numerically displayed scale values fitting the measuring range section, with the overall measuring range remaining constant and the measuring range section having a selected spreading factor.

Digital measuring device for the quasi-analog indication of measurement

Digital measuring device, including a trigger generator having an input for receiving an analog measuring input signal, a variable delay line being connected to the trigger generator and having an output, an analog/digital converter receiving the analog measuring input signal, a transient memory connected to the analog/digital converter, a picture refresh memory connected to the transient memory for storing the measuring input signal, a Walsh function generator connected to the picture refresh memory, a liquid-crystal picture screen being connected to and addressed by the Walsh function generator, the output of the variable delay line being connected to the analog/digital converter, the transient memory and the picture refresh memory, and a selectable time base being connected to the variable delay line, the analog/digital converter and the transient memory.

Growing community of inventors

Nuremberg, Germany

Gunter Roppelt