Simultaneous time domain and spectrum analysis on 1 GHz oscilloscopes

February 25, 2015 // By Graham Prophet
Rohde & Schwarz' RTM bench oscilloscopes can now simultaneously analyse analog, digital, protocol-based and RF signals. This spectrum analysis and spectrogram option can also be used in the new 1 GHz model.

Rohde & Schwarz has added the R&S RTM-K18 spectrum analysis and spectrogram option to its RTM oscilloscope family, which the company says makes RTM the only oscilloscope in its class that can analyse the time domain while simultaneously analysing the spectrum, logic and serial protocol. Interactions such as those that occur in electronic devices with RF components are quickly analysed in a single measurement.

Time and spectrum analyses can be configured completely independently of one another. This means that users can simultaneously analyse signal details that differ in time and frequency, with the optimum settings for each. Separate implementation of the signal paths makes this possible. As with a spectrum analyser, important parameters such as centre frequency and resolution bandwidth can be specifically configured to match each measurement task. The hardware-implemented digital downconverter (DDC) reduces the spectrum to the components relevant for analysis. As a result, the RTM offers fast and reactive analysis of embedded designs.

Additional displays for min. hold, max. hold and average, as well as markers for automatic peak value searches, are available to the user during spectrum analysis. Changes in the spectrum over time or sporadic unwanted signals are immediately visible in the spectrogram display. The amplitudes versus frequency and time are colour coded.

With the R&S RTM-K15 history and segmented memory option, users can load all acquisition components from the 460 Msample deep memory and analyse them with the RTM measurement functions. The RTM series now has 200 MHz, 350 MHz and 500 MHz bandwidth versions, and now includes two-channel and four-channel models with 1 GHz bandwidth, all with true 1mV/div sesitivity at the full bandwidth and full ADC resolution with exceedingly low 270 µV noise.

Rohde & Schwarz;