# FRA Frequency span to small

**FRA Frequency span to small**, a forum discussion on Cleverscope Mixed Signal USB Oscilloscopes. Join us for more discussions on

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**Andrew**

6 Jul 2018

Posts: 1

We are trying to measure the low frequency impedance of some batteries. Is there anyway to increase the span of the FRA to 1mHz - 1kHz?

**bartschroder**

4th July

Posts: 425

Hello Andrew,

Currently not.

But we have been working on a new FRA control panel in the background, and with this one we have a new graph which is a collection of XY points, rather than a linear graph. With 1mHz to 1kHz, we would need a point resolution of 1 mHz, and so 1M pints per Hz, so 1000M points. In the next incarnation, we will just plot decade values. So if there were 6 decades, with 100 points per decade that would be 600 points. Much better.

The sig gen currently has a lower limit of 100 mHz, as we have a maximum capture period of 10 seconds. (1/100 mHz). However we can use streaming to capture slower but this will need work. So the answer is that this is possible, but no one else has asked so far!

Currently not.

But we have been working on a new FRA control panel in the background, and with this one we have a new graph which is a collection of XY points, rather than a linear graph. With 1mHz to 1kHz, we would need a point resolution of 1 mHz, and so 1M pints per Hz, so 1000M points. In the next incarnation, we will just plot decade values. So if there were 6 decades, with 100 points per decade that would be 600 points. Much better.

The sig gen currently has a lower limit of 100 mHz, as we have a maximum capture period of 10 seconds. (1/100 mHz). However we can use streaming to capture slower but this will need work. So the answer is that this is possible, but no one else has asked so far!

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