Thanks JF, that indeed was the problem, now to fix it!<BR><BR><B><I>Hélie, Jean-François &lt;<a href="/cgi-bin/wa?LOGON=A3%3D0705%26L%3DISOGEOCHEM%26E%3D8bit%26P%3D429257%26B%3D--0-51388279-1180536189%253D%253A73812%26T%3Dtext%252Fhtml%3B%2520charset%3Diso-8859-1" target="_parent" >[log in to unmask]</a>&gt;</I></B> wrote:  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi Neil,<BR><BR>Sounds like your trap is leaking... it happened to me a few times. Try to bring your trap current down to 100. If it works (source status 0), then you have a leak on your trap. It usually is the ceramic spacer on top of the trap box that moves ever so slightly creating a gap from which your trap is leaking.<BR><BR>Good luck.<BR>JF <BR><BR>--------------------------------------------------<BR>Jean-François Hélie, PhD<BR>Gestionnaire du laboratoire d'isotopes stables / laboratory manager<BR>Centre de recherche GEOTOP-UQÀM-McGILL<BR><BR>Professeur associé / adjunct professor<BR>Département des sciences de la Terre et de l'atmosphère<BR>Université du Québec à Montréal<BR><BR>Bureau/Office: +1(514) 987-3000
 #2413<BR>Courriel/e-mail: <a href="/cgi-bin/wa?LOGON=A3%3D0705%26L%3DISOGEOCHEM%26E%3D8bit%26P%3D429257%26B%3D--0-51388279-1180536189%253D%253A73812%26T%3Dtext%252Fhtml%3B%2520charset%3Diso-8859-1" target="_parent" >[log in to unmask]</a> <BR>Web: http://www.geotop.uqam.ca/isotopesstables <BR>---------------------------------------------------<BR><BR>-----Message d'origine-----<BR>De&nbsp;: Stable Isotope Geochemistry [mailto:[log in to unmask]] De la part de <a href="/cgi-bin/wa?LOGON=A3%3D0705%26L%3DISOGEOCHEM%26E%3D8bit%26P%3D429257%26B%3D--0-51388279-1180536189%253D%253A73812%26T%3Dtext%252Fhtml%3B%2520charset%3Diso-8859-1" target="_parent" >[log in to unmask]</a><BR>Envoyé&nbsp;: 30 mai 2007 07:07<BR>À&nbsp;: <a href="/cgi-bin/wa?LOGON=A3%3D0705%26L%3DISOGEOCHEM%26E%3D8bit%26P%3D429257%26B%3D--0-51388279-1180536189%253D%253A73812%26T%3Dtext%252Fhtml%3B%2520charset%3Diso-8859-1" target="_parent" >[log in to unmask]</a><BR>Objet&nbsp;: [ISOGEOCHEM] ISOPRIME SOURCE PROB<BR><BR>Dear all:<BR><BR>I recently replaced the filament on my isoprime source, only to find that <BR>the source wouldnt come on when selected. After venting I did a thorough <BR>electrical conncetivity test on all pins right from the source housing <BR>through to those pins that connect to the electronics box. Ensuring that no <BR>connector were touching in and around the source itself I reattached the <BR>source flange and when the vacuum and pressures were at desired <BR>levels...again nothing. Souce Status: red bar, reading 255 changed to red
 <BR>bar reading 18.0 when source switched on. Perhaps there was a leak on the <BR>capilliaries from my ref box and EA so changed the union fitting here right <BR>before the NUPRO...no effect still reading 18 with a red bar. Assuming good <BR>connectivity and no leak (Hi Vac 4e-2 prior to source turn on) how can i <BR>resolve this problem<BR><BR>Cheers<BR><BR>Neil<BR><BR>Neil Ogle<BR>Research Fellow<BR>SPACE<BR>QUB<BR>Northern Ireland<BR></BLOCKQUOTE><BR>