System Evaluation Tools - Thermo Scientific LTQ Series Hardware Manual

6
Diagnostics
Using the Diagnostic Tools

System Evaluation Tools

Table 11. System evaluation tools and their descriptions (Sheet 1 of 3)
System evaluation tool
API Stability Evaluation
Ejection and Multiplier Gain
Ratio (LTQ XL, LTQ Velos,
and Velos Pro only)
Electron Multiplier Noise
Evaluation
Injection RF Evaluation
Injection Waveform Evaluation
Ion Optics Charging Evaluation
(LTQ Velos and Velos Pro only)
128 LTQ Series Hardware Manual
Table 11 lists the available system evaluation tools (procedures) for the LTQ Series in the
order shown in the Tune Plus application. Several of the system evaluation tools operate when
the system is in positive or negative mode, and the other tools only operate in positive mode.
Note If the table's last column specifics "Positive (manual)," manually set the mass
spectrometer to positive mode before you run that system evaluation tool.
Description
Determines the relative standard deviation (RSD)
of the base peak in the current scan mode. Because
this procedure runs indefinitely, when you are ready
to end the evaluation, click Cancel or OK, which
closes the dialog box.
Measures the ratio of the signals produced by the
ions as they eject on either side of the ion trap. This
signal ratio can indicate an asymmetry of the
ejection slot geometry, a blockage of the slot by
foreign material or an electron multiplier gain
mismatch.
Determines the noise level in terms of the number
of noise pulses per scan from the multipliers,
dynode, and rf voltage (high mass noise). It turns
on and turns off the various elements to determine
the location of any noise if the noise level exceeds
the fixed threshold.
Evaluates the storage efficiency of various mass ions
as a function of the ion trap's rf voltage during ion
injection, which can help identify problems with
the ion trap structure or rf voltage.
Compares the storage efficiency of the ion trap with
the injection waveforms turned on and off, which
can help identify problems with the ion trap
structure or injection waveform circuitry.
a
Helps identify if specific ion optic elements, from
the exit lens to the front lens, might be charging
and are in need of cleaning.
Infusion of
Positive or
calibration
negative
solution
mode
required
Yes, or any Both
analyte
Yes Both
No Both
Yes Positive
(manual)
Yes Both
Yes Positive
(automatic)
Thermo Scientific