Carolyn,

Before you pull the source yet again, I would check the connections on the outside of the source flange - behind the white ptfe cap. We once had a fault with the box/trap readings that were finally traced to one of the external source cables working loose from the feed-throughs.

Saying that, our latest fault was caused by a combination of an internal connection working loose, and an Isodat problem. Credit to Chris Sillman of Thermo, who sorted it all out in double quick time, after we had puzzled over it for a couple of weeks!

Mick 

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Dr Mick Cooper
Nottingham Fuel and Energy Centre
SChEME
The University of Nottingham
University Park
Nottingham                             Office tel:  +115 951 4198
NG7 2RD                               Lab tel:     +115 951 8127    
UK                                          Fax:          +115 951 4115
                                               [log in to unmask]
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++



This message has been checked for viruses but the contents of an attachment
may still contain software viruses, which could damage your computer system:
you are advised to perform your own checks. Email communications with the
University of Nottingham may be monitored as permitted by UK legislation.