Finding min measurement value at specific setting

[EvaldasK]

Hi All,

I am trying to adjust the noise level of a signal.

I can adjust the noise level by sending command to increase or decrease the offset on the device.

after each command sent I am measuring the signal level and comparing it with the previous measurement.

if the current measurement is lower then the previous measurement I continue to increase/decrease the offset.

At some point the noise level will start to increase again. I need to find the lowest point of the measured signal.

Any help is very appreciated.

Thanks

[crossrulz]

So what do you have so far?  Sounds like you need a While Loop, a Shift Register to hold the last noise measurement, probably another Shift Register to hold your current setting.  Not sure what more help you need.

[EvaldasK]

Please see my example, I currently able to find if the new value is lower then the old one, but in the example, I stop the script when the measured level is below certain point.

but this is not enough as depending on the Device under test the value might change. 

Therefore I need to stop when the value is the lowest.

Note: I dont know what offset value is, I can only increase it or decrease it.

I guess I could try to count the iterations when I increase and decrease the value and assign a number, that way I could assign  a value measured to each number and compare them.

[EvaldasK · Accepted solution]

I have found a solution, I find and store the lowest value then find the bounce when the measurement value stats to increase again. I let it bounce few times then stop it when the value measured is the same as my lowest value measured.

See picture attached.

Maybe it will be helpful for someone.