Ripple and noise measurement

Video of ripple and noise measurement with a high voltage EHS module

Today’s video shows how to perform ripple and noise measurement in a multi-channel high voltage module, type EHS, from the manufacturer ISEG Spezialelektronik GmbH. All high voltage multichannel modules from ISEG are designed with a patented resonant switching technology called ‘soft switching’ (NIM, VME, Multichannel modules, DC-DC converters …). This soft switching mode with transistors guarantees a very low and we can even call it an ultra low residual ripple and noise level.

Learn more about the manufacturer ISEG Spezialelektronik GmbH.

Read here an article on the same subject from the manufacturer.

Ripple and noise measurement | EHS Standard Module | 500 V | Iseg

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Setup for the measurement of the ripple and noise

The ripple and noise measurement requires a few electronic devices including :

Your high voltage EHS module (or any other in NIM, VME, etc. formats) equipped with its chassis and controller,
A wide bandwidth oscilloscope,
A ripple adapter (this one we can lend to you or you can buy it from our partner ISEG for whom we are the reseller in France). It allows to block the DC component to let the AC component pass,
A splitter box allows to connect one or several resistive / capacitive loads in parallel of the measurement. In this case, there is no interest in placing a capacitive load since it would play in favor of noise reduction, which we do not seek to do,
A set of cables equipped with SHV and BNC sockets.

We are happy to help you to implement this setup.

Measurement procedure from the setup

We use our Easy LV HV software to threshold the high voltage level. This will allow us to verify that the ripple and noise measurement is in accordance with what we announce in our technical documentation. The graphical tool shows the evolution of the high voltage. At each voltage level, we measure the noise in several frequency intervals, for this we change the time base very regularly.

The time bases used are 100 ms, 10 ms and 10 µs in order to cover the frequency bands from 10 Hz to 100 kHz.

Our ripple adapter has a bandwidth of 0.1 Hz to 10 MHz, sufficient for our measurements. Beyond that, the measurement of ripple and noise is no longer of interest since the resonant conversion technique does not generate high-order harmonics.