Ed,
I was hoping that Dave Hillman (the uncle of SERA) would reply, but alas.  So, here goes from what I know.  The values I am quoting come from US military standard MIL-F-1456.
Voc This is the original starting voltage.  The MIL acceptable range is -0.461 to -0.613 Volts.  These are relative to saturated calomel electrode.
V2 This is the voltage associated with the reduction of SnO.  This is a key parameter.  It should be equal to or greater than -1.07 volts.
V3 Voltage at the inflection point of the curve -1.29 to -1.412 Volts
Vf The final voltage of the system.  At this point you are hydrolyzing water. -1.365 to -1.466 volts.  This is a good test of your electrode and whether or not you have got to a clean tin/lead surface.
Q1 Charge needed to reduce tin/copper intermetallic.  This should be as small as possible.  MIL spec allows up to 1.312 mC/cm2.
Q2 Charge associated with SnO  Up to 3.823 mC/cm2
Q3 Charge associated with SnO2 Up to 3.299 mC/cm2
Qt = Q1+Q2+Q3  MILL SPEC says 2.005 to 5.985 mC/cm2.  Not sure why a lower limit.

Note that graphs are often printed with an x axis of time (second) rather than charge density. I don't have time (pun) to do the conversion here.

The SERA System uses a silver/silver chloride reference electrode.  The manual dos not give any detail about the voltage differences between the two reference electrodes and I do not have time to look it up. 

Hey, I've got to catch a plane.  Signing off TechNet now.  Hopefully Dave will show up to finish this. 
regards,
Bev


-----Original Message-----
From: Edward Szpruch [mailto:[log in to unmask]]
Sent: March 21, 2004 4:27 AM
To: [log in to unmask]
Subject: [TN] SERA results


> Hi,
> I need short explanations about meaning ( in terms of Pb/Sn solderability
> issues ) of values produced by SERA equipment :
> Voc
> Q1
> V2
> Q2
> V3
> Q3
> Vf
> Qt
>
> regrads
> Edward
>
> Edward Szpruch
> Eltek Ltd
> P.O.Box 159 ; 49101 Petah Tikva Israel
> Tel  ++972 3 9395050 , Fax  ++972 3 9309581
> e-mail   [log in to unmask]
>
>

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