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13
Frequently Asked Questions
146
•
Ion Source: The ion source has become contaminated or
dirty; clean the source or replace the necessary parts.
•
Method Parameters:
MSD Parameters: Incorrect mass assignments are
•
being used with your method.
•
GC Parameters: Method uses incorrect split ratio or
requires a longer purge time.
To improve your sensitivity:
•
Perform autotune to verify MSD performance.
•
Refer to the hardware manual for step by step
troubleshooting procedures.
•
Call Agilent Technologies Customer Support.
Q.
When loading a data file, the error message "No MS Data"
appears. What does this mean and what is the cause?
"No MS Data" means that the data file selected does not
A.
contain the data.ms within the datafile.d. Typically this
occurs when the user forgets to save the MS data file
within the method parameters, the remote start/stop cable
is not connected, or the acquisition was aborted or
terminated.
Q.
When right-clicking on the TIS, the spectrum does not
display, and the cursor is a (+) instead of a line. What
causes this?
A.
This is generally caused by the manual integration feature
turned ON in Data Analysis. In this mode, to turn OFF
manual integration, use the Manual Integration option in the
data analysis option dialog box. The cursor in the
chromatogram window should return to a vertical line.
Q.
How does the Match Quality of library search results relate
to the compound?
A.
The Match Quality of the unknown is identified as the
reference. Values greater than 90 are very good matches.
Values less than 50 mean that substantial differences exist
between the unknown and reference and the match should
be regarded as uncertain. Differences in probability values
of ±5 are generally not significant. An asterisk (*) before
the probability value indicates that the molecular ion was
used in the match. Because many factors affect the match
quality and ordering of the compounds in the hit list, the
list should be viewed as an interpretative guide to the
unknown's identity. It is the chemist's responsibility to
Agilent G1701EA MSD Productivity ChemStation Familiarization Guide
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