Dynamic Threshold

[IAF_FTC]

Hi again.
My question this time is regarding "Dynamic Thresholdong" (if there is
something like this)...
What I would like to do is to set a threshold on a strip chart and to
change it dynamically according to the behavior of another parameter.
To be more specific: I would like to change the threshold values of a
strip chart based on a DM value in a Frequency Plot, according to a
known ratio (for example:5Hz dominant peak on the FP will set a
threshold of +-6 and a 7Hz will set +-10)
Any suggestions?
Thanks,
Tomer

[Jim Bretz]

Hi Tomer,

Sorry... Can't do that right now :( There's a request in our database for
this type of capability. I'll add your request their too.

There might be another way... Let me think about it.

Are you doing an actual threshold check using the IADS threshold system or
is this just a "visual check" (your eyes watching the value),
Jim

[Jim Bretz]

>> To be more specific: I would like to change the threshold values of a
>> strip chart based on a DM value in a Frequency Plot, according to a
>> known ratio (for example:5Hz dominant peak on the FP will set a
>> threshold of +-6 and a 7Hz will set +-10)

> Are you doing an actual threshold check using the IADS threshold system or

> is this just a "visual check" (your eyes watching the value),

What I'm suggesting is to use the new DominantMode function that I sent you
to create two new derived parameters

LowerThreshold = IadsFunctions1.DominantMode( Param,
GetUpdateRate(Param) ) * (someFactor) * -1
UpperThreshold = IadsFunctions1.DominantMode( Param,
GetUpdateRate(Param) ) * (someFactor)

Where "someFactor" is the equation to map from the DominantMode to the
desired threshold value....

Then you can drop those two extra parameters on the StripChart (while
holding down the "ctrl" key to add them).. and you can even set their line
colors using the properties sheet to something appropriate.

Do you see what I'm getting at? Instead of threshold lines use parameters so
the values can be dynamically calculated,
Jim

P.S. Of course, this wouldn't officially log an Iads threshold in the
threshold log, but it would be a good visual indicator.