A method, apparatus, and energy metering system obtains mains samples of a mains power line signal, performs non-white noise (NWN) filtering of the mains power line signal, obtains adjustable clock source samples of an adjustable clock signal of an adjustable clock oscillator, determines a difference based on the mains samples and the adjustable clock source samples, adjusts an adjustable clock source frequency of the adjustable clock oscillator based on the difference, and applies the adjustable clock source frequency to an analog to digital converter (ADC) to determine a conversion rate of the ADC.

A measuring device comprises an interface, adapted to acquire a measuring signal, a triggering unit, adapted to determine at least one condition of the measuring signal based on an initial triggering condition, and a storage unit adapted to store data words, comprising changes of the at least one condition of the measuring signal and instances in time at which the changes of the at least one condition occur. Moreover, the measuring device comprises a parameter determination unit, adapted to determine at least one parameter from the data words and a parameter histogram unit, adapted to determine a parameter histogram of the at least one parameter.

Methods and systems for estimating arrival time of switching events include measuring two or more emission events from a device under test under different skew conditions. The two or more emission events are close in time and space when no skew condition is applied. The measured waveforms of the two or more emission events are analyzed with associated skew conditions to determine a skew value that corresponds with a time separation between the two or more emission events.

Embodiments of the present disclosure relate to a test and/or measurement instrument for measuring a radio frequency signal. The instrument has an input port, a measurement circuit configured to measure and digitize the radio frequency signal, thereby outputting a data stream. The instrument also has a trigger port configured to receive a periodic external trigger signal with periodically spaced trigger pulses. Further, the instrument has a trigger circuit configured to generate virtual trigger pulses based on the trigger pulses in the periodic external trigger signal. The instrument also includes an acquisition control circuit configured to receive the virtual trigger pulses. The acquisition control circuit is configured, upon reception of a virtual trigger pulse, to add a trigger information to the data stream generated by the measurement circuit.

The present disclosure provides a measurement application device comprising at least one signal acquisition interface configured to acquire an analog input signal and output a digital input signal, a first decimator for each signal acquisition interface, each one of the first decimators being configured to reduce the number of samples of the respective digital input signal and output a first decimated digital input signal, at least one second decimator for each signal acquisition interface, each one of the second decimators being configured to reduce the number of samples of the respective digital input signal and output a second decimated digital input signal, and at least one decoder for each one of the second decimators, each one of the decoders being configured to decode the respective second decimated digital input signal according to a respective protocol and provide a respective decoded input signal.