Setting Up Nominal Mass - Waters GCT Premier Operator's Manual

Setting up nominal mass

The instrument's mass scale is set up to provide nominal mass measurement
without calibration. This specifies a Veff (effective potential) value on
installation. The Veff value must be routinely evaluated and changed.
See also: Table titled "TDC Settings dialog box parameters:" on page B-13.
TDC Settings dialog box:
Manually setting the Veff correctly
The first stage of calibrating the mass scale requires that you set the Veff
parameter to give nominal mass. When Veff is set correctly, the masses are
±
correct to within 0.5 Da.
By changing Veff, the effective mass of the ions changes.
Veff is automatically set up during the Instrument Setup wizard.
Setting up nominal mass B-47