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<== Date ==> <== Thread ==>

Subject: Re: Logarithmic conversion / Breakpoint tabes
From: Steven Hartman <[email protected]>
To: Gavin Smith <[email protected]>
Cc: [email protected]
Date: Tue, 29 Mar 2005 10:08:45 -0500 (EST)
On Tue, 29 Mar 2005, Gavin Smith wrote:

> I have an Ai record which gets raw data from a pressure (vacuum?) sensor
> measured by the PLC. The raw data ranges from 0 to 256000 and represents
> a Torr of 1e-11 through to 1e-3. I am wanting to convert this into the
> engineering units, but as far as I can see only linear styles of
> conversion are supported.

We have vacuum gauges with similar output. I just use an ai record to get
the voltage from an ADC connected to the gauge. The ai is FLNK'd to a calc
record which computes the value in Torr.

> In addition to inputs, I need to have a couple of Ao's, representing
> maximum allowable pressures, etc.

Perhaps I am misunderstanding you here, but can't you just use the HIGH
and HIHI field of the pressure calc record for this?

-- 
Steve Hartman
[email protected] || 919-660-2650
Duke Free Electron Laser Laboratory

References:
Logarithmic conversion / Breakpoint tabes Gavin Smith

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