To Set Up The Software For Ci Operation - Agilent Technologies 5977B Series Operating Manual

To Set Up the Software for CI Operation

Always verify GC/MS performance in EI before switching to CI operation.
C A U T I O N
Procedure
1 From the Tune and Vacuum Control view, select Load Tune Parameters from the
2 If CI autotune has never been run for this tune file, the software will
Table 12 Default Tune Control Limits, used by CI autotune only
Reagent gas
Ion polarity
Abundance target
Peakwidth target
Maximum repeller
Maximum emission current,
µA
Max electron energy, eV
Notes for
• N/A: Not available. There are no PFDTD ions formed in PCI with any
5977B Series MSD Operating Manual
File menu, and load the tune file PCICH4.U.
prompt you through a series of dialog boxes. Accept the default values
unless you have a very good reason for changing anything.
The tune values have a dramatic effect on MSD performance. Always start
with the default values when first setting up for CI, and then make
adjustments for your specific application. (See
for the Tune Control Limits box.) These limits are used by Autotune only.
They should not be confused with the parameters set in Edit MS
Parameters or with those appearing on the tune report.
Methane
Positive Negative
6 6
1x10 1x10
0.6 0.6
4 4
240 50
240 240
Table 12:
reagent gas but methane, hence, CI autotune is not available with these
configurations.
Isobutane
Positive Negative
6
N/A 1x10
N/A 0.6
N/A 4
N/A 50
N/A 240
Operating in CI Mode
Table 12 for default values
Ammonia
Positive Negative
N/A 1x10
N/A 0.6
N/A 4
N/A 50
N/A 240
5
6
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