The default Malvern Instruments data file extension (.SAM) will be appended to
the filename entered by the user. There is a limit of eight characters for the
sample filename.
Lens
The lens option defines which focus lens is to be used for the measurement. Any
one of the following options may be entered, “45F”, “100F”, “300F”, “300RF”, or
1000F”. If you are using the Accessory on a Mastersizer Micro or Microplus then
this question will not be asked.
Stirrer Speed
The stirrer speed defines the speed of the Dispersion Unit pump / stirrer shaft.
The user is prompted to enter the desired speed for the measurement. If the
actual speed is more than 20 rpm different to the requested speed the user is
prompted to change it. The user has the option of accepting the current stirrer
speed. The actual stirrer speed is recorded in the sample details for the
measurement.
The optimal operating range is 2000 to 3500 rpm.
Background Sweeps
Each time the Qspec MS1 macro is run, an alignment and background
measurement is performed in accordance with the recommended practice. The
background sweeps figure defines the number of sweeps of the detector that is
performed during the background measurement.
It is recommended that the same number of sweeps is used for the background
measurement as for the actual measurement itself. Up to 65,535 sweeps are
allowed. A typical setting will be in the region of 3 - 4000.
Measurement Sweeps
The measurement sweeps figure defines the number of sweeps of the detector for
each measurement. It is recommended that the number of measurement sweeps
is the same as the number of background sweeps that were performed at the start
of the measurement sequence. Up to 65,535 sweeps are allowed. A typical setting
will be in the region of 3 - 4000.
CHAPTER 7
QS Small Volume Sample Dispersion Unit
Page 7.2
MAN 0161
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