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Operation Manual 189
Before you can calibrate the column, make sure that:
• You are using a capillary column
• The column is defined
• There are no oven ramps
• The column gas source (usually the inlet) is On and
non- zero
Also note that column calibration fails if the calculated
column length correction is >
5 m, or if the calculated
diameter correction is >
20 μm.
Calibration modes
There are three ways to calibrate the column length and/or
diameter:
• Calibrate using an actual measured column flow rate
• Calibrate using an unretained peak time (elution time)
• Calibrate both length and diameter using flow rate and
elution time
To estimate the actual column length or diameter from an elution
time
1 Set oven ramp 1 to 0.00, then verify that the column is
defined.
2 Perform a run using an unretained compound and record
the elution time.
3 Press [Options], scroll to Calibration and press [Enter].
4 From the calibration list, select the column and press
[Enter]. The GC displays the current calibration mode for
the column.
5 To recalibrate or to change calibration mode, press
[Mode/Type] to see the column calibration mode menu.
When you measure the column flow rate, be sure to convert the
measurement to normal temperature and pressure if your
measurement device does not report data at NTP. If you enter
uncorrected data, the calibration will be wrong.
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