Logarithmic scale on vertical bar in the measurement window.

Hello

I have a signal that I want to have presented in the measurement window with a logarithmic scale, both as a vertical bar and in the recorder.

Is there any solution to achieve this?

//Anders

Dear Anders,

2D graph allows you to draw horizontal and vertical axis as logaritmic.

Thanks for the reply.

It didn't really work with this solution for us, but we have solved it in another way.

/ Anders

Anders, I'm happy to hear that.


Feel free to share the solution also with others.

Sorry for the late reply

It wasn't a perfect solution, but it still works ok. We took the scale and inserted it as an image next to the recorder widget, where the signal value from the detector is displayed (in volts). The same signal was then converted in a math function to get the correct value (cps) in the display widget.

If there is a better solution to get the same scale directly in the recorder widget it would be great?

//Anders

Hello,

Thank you for sharing the solution. From what you have presented you need only y-axis in logarithmic scale while x-axis in time manner. What is the application of such measurement?

best regards

Hi

That is correct we want a logarithmic y-axis and the x-axis in time manner.

We log the signal to an indicator which indicates (CPS), from an equipment that measures the neutron flux. We want to see the change of the signal over time.

regards

Anders

Dear Anders,

Thank you for the information. What about using the XY recorder and set axis as LOG? Please see the screenshot below and a video for a reference.

Hello, I arrived here because I was searching for the same solution. Reviewing the messages above, it's clear that Dewesoft is not correctly understanding the need / request. The recorder needs to allow the vertical (y) axis to be displayed as a Logarithmic scale, while keeping the X axis as a time scale and linear.

The application for this, in my case, is UHV (ultra high vacuum) research. However this would apply to anyone who's measuring a value that changes exponentially. Some of the tests start at atmospheric pressure and quickly dive down to readings in the 10^-4 to 10^-8 range. With the linear graph this ends up looking like a line that dives towards the bottom of the y axis immediately, and then all the real action just looks like a line running along the lowest limit of the y-axis. With logarithmic display the data would be presented in a much more convenient format. Then I can see atmospheric pressure, but also clearly see what happening in the 0.1, 0.01, 0.001, 0.0001, ranges, etc. Right now I need to zoom in to take measurements, which while functional, is poor for graphics for reporting and overall system monitoring. Log displays are standard for high vacuum.

It's very surprising that this isn't a quick toggle option for the recorder widget and seems like it should be easy to implement. The Hioki equipment I've previously been using had this as a quick built in function to toggle linear/log scales.

Is this something that can be added?

Hi Chris, thanks for contacting us.

I understand your issue about readability of data spanning several decades. I've talked to development and It's been included in the to-do list to add this functionality to the Recorder widget.

In the meantime using the mentioned XY Recorder should still be a decent solution. I have created a setup file for you (attached) that mimics the desired behaviour. I used 2 math channels; "time" on x axis and "|sine|" signal on Y axis, which is in logscale.

It works ok although this is a static graph, so you need to extend the time scale manually or rescale by clicking. I hope this solution will work for you until the recorder is updated.

Regards, Staš Jevešvar