The Shimadzu PDA-7000 is high performance optical emission spectrometers, utilizing the PDA method as standard, which enhances the accuracy and reliability of analysis. The PDA method, combined with excellent hardware quality, make the PDA-7000 suitable for any application in metal analysis. They. Ultimate pressure: 2 Pa One of three frequencies automatically set for the discharge conditions. Report functions Database functions 2. • To ensure safe operation, read all Safety Instructions before. The monochromator must be held in a vacuum or in a gas-replacement atmosphere to avoid effects due to the absorption of spectral lines such as C, P, S, B, and N by atmospheric oxygen.