HIGH-DYNAMIC AMMETER WITH SMALL TIME CONSTANT

摘要

The invention provides two different ammeters which in their core are based in each case on an operation amplifier connected as current voltage converter. The particular advantages of the instruments according to the invention with respect to generic instruments can be found in each case in a target-directed modification of the circuitry resistor in the feedback path. In the instrument according to the main claim ("instrument 1"), the circuitry resistance changes as a function of the current to be measured. Instrument (1) is thus a linear amplifier with automatic, quasi-instantaneous measurement range switching, optionally also with multiple output channels with different sensitivities which can be recorded simultaneously. In the instrument according to the subclaim ("instrument 2"), the circuitry resistor comprises at least two biased diodes. Instrument (2) is thus a logarithmic amplifier with a sensitivity which can be adjusted by way of the bias. The advantages of instruments (1 and 2) can be intercombined as desired in an instrument because they are technically related.