Agilent Technologies 7000 Triple Quadrupole GC/MS, Maintenance Manual

Page: 31 / 214

General Troubleshooting
2
Troubleshooting and Maintenance Manual 31
Peaks have split tops
• Bad injection technique
• Injection is too large
Baseline is rising
• Column bleed
• Other contamination
Baseline is high
•
Column bleed
• Other contamination
• Electron multiplier voltage is too high
Baseline is falling
A falling baseline indicates contamination is being swept away. Wait until the
baseline reaches an acceptable level. Common causes include:
• Residual air and water from a recent venting
•
Column bleed
• Septum bleed
• Splitless injection time too long (inlet is not properly swept, resulting in
excess solvent on the column and slow solvent decay)