Edax Element, Руководство пользователя, Страница: 16 / 21

Basic Operation
Element Basic User Guide
Page 16 of 21
4.4 LIGHT ELEMENT OPERATION
1. Check that the geometry is correct when collecting spectra. For example, an incorrect tilt used,
giving an incorrect Take Off Angle, will affect the Quant results. You can also correct this after
the data has been collected by editing the spectra file parameters.
2. Check that you are using a well-defined peak when quantifying. Avoid using peaks that are
“buried” in the background.
3. Use one of the longer amp times when specifically looking for light energy elements. They
typically provide better light element performance.
4. Use low accelerating voltage when specifically looking for light energy elements.
3. Make sure the samples are flat and homogeneous when possible.
4. Collect for sufficient time to improve the statics when the peaks are very small, for example
when looking at Boron.
4.5 FREQUENTLY ASKED QUESTIONS (FAQ)
Q1. Should I leave the detector powered on all of the time?
A1.
In most laboratory conditions (stable power, temperature controlled), leaving the detector powered
on all of the time is fine.
Q2. Should I leave the detector cold all of the time?
A2.
The detector will reach operating temperature in about two minutes, so it does not need to be left
cooled when not in use. It is okay to leave the detector cold when the microscope chamber is left under
vacuum. There is a user preference option to automatically turn the cooling off after inactivity, in case
the user prefers to turn the cooling off automatically.
Q3. The software displays a message that the detector temperature is not changing, or a
communication problem with the detector. What should I do?
A3.
In this case, power off the detector using the switch on the small black power “brick” for the
detector then reboot the PC. Then power the detector back on after Windows has started.
Q4. How often should I calibrate?
A4
. Many labs only calibrate their systems during a regularly scheduled service preventative
maintenance visit. The detector will need to be calibrated in some cases when then spectrum peaks do
not match the blue line modeled peaks. For this case, a calibration will bring the peaks into alignment
with the modeled line. In other cases, labs may want to set a regular calibration schedule any time from
weekly to monthly.
Q5. What count rate should I use to calibrate?
A5
. We recommend using a copper and aluminum sample with a primary beam at ≥ 20 kV. Adjust the
sample position so both Copper and Aluminum can be seen on the same screen. Set the position so the
Copper and Aluminum Kα peaks are similar in height, but with the Al peak larger than the CuK peak by
20 to 50%. Set the beam conditions so the Dead Time is ≤ 40% as you should use during normal use.