EDS Reference blocks
All SEM and EDS systems need calibrating. EM Resolutions Ltd offers high quality resolution standards in combination with a QCT (Quality Control Test) block from MAC, containing your choice of EDS standards. These can be selected from an extensive range of elements from across the periodic table.
Each standard block has dimensions: 32mm diameter x 8mm thick and is supplied with a Faraday Cup for accurate probe/specimen current measurement and a silicon grid magnification standard to allow for calibration of magnification levels within a SEM.
For resolution testing we include our Gold on Carbon resolution standard with or without a Tin on Carbon resolution standard. We can provide Gold on Carbon test specimens which are suitable for SE and BSD imaging in a range of sizes depending on the resolution performance of your microscope.
Please see our SEM resolution standards page for more details or call us on 01799 522500 or by email to discuss your requirements and pricing.
Typical configurations include:
Example 1 Contains: 6 Individual Standards (your choice) , Faraday Cup, Duplex Brass, Silicon Magnification Grid, Gold on Carbon Resolution Standard
Example 2 Contains: 4 Individual Standards (your choice), Faraday Cup, Duplex Brass, Silicon Magnification Grid, Gold on Carbon Resolution Standard (High), Gold or Tin on Carbon Resolution Standard (Medium), BSD standard
The BSD reference standard is used for checking the contrast efficiency of Backscattered Detectors. Each of the reference specimens consists of two high purity elements that have an atomic number difference of 1.
The Duplex Brass standard allows for checking the resolution and performance of the Backscatteerd Electron Detector. The resolution of a detector is usuallly quoted as 0.1 (Z) where the atomic number (Z)=30. This is obtained from the standard by the mean atomic number between phases ά/β Brass, being 0.1Z
Having a stable probe current is vital for achieving repeatable analysis results. The Faraday Cup has a hole size of 150um and is used for measuring the beam current at the specimen plane. The beam of electrons is focussed inside the hole by increasing magnification so that all the electrons are trapped when the hole fills the screen and a true measure of current is acheived.
Individual EDS standards
Also available to order as individual elements of known purity. Available on the stub of your choice.
Repolishing of EDS standards
It is recommended that EDS calibration standards are returned for re-polishing every two years. EM Resolutions can arrange for your EDS standard block to be re-polished and coated. Please contact us for further details or to discuss your requirements.