Hi Chi,
Thanks for the old values. I will do a comparison.
There is no pedestal with the new calibration. Don't know if this is
a problem or not but unless there is a way to measure the pedestal and
we do this regularly I don't see the need. And since the pedestal in
the old code is a constant and not updated or changed this can't be a
problem. Just for comparison if you look at the Amp to DCCT
calibration the p0 term is 2418.39 which is fairly close to 2400.
We did the calibration from 0 Amps to 0.250 Amps so should be valid
for the whole range.
Cheers,
Douglas
26-415 M.I.T.
Tel: +1 (617) 258-7199
77 Massachusetts Avenue Fax: +1 (617)
258-5440
Cambridge, MA 02139, USA E-mail:
hasell@mit.edu
On Apr 13, 2005, at 5:40 PM, Chi Zhang wrote:
>
> Hi Doug
>
> first just for reference, this is the old calibration used to convert
> scaler DCCT to Amps, effective since run 418, yet 418.
>
> it is a quadratic, a pedestal is subtracted from DCCT counts first
> pedestal: 2400
> p0: 2.90027
> p1: 3.01409e-4
> p2: 6.18094e-10
>
> Now question: is there a pedestal substraction in the new calibration?
> So
> it covers upto 250mA, how about on the lower side, what is minimal
> current
> this fit covers? Though it s not likely, will there be a point in time
> prior to which this calibration stops to be effective?
>
> Chi
>
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