SALEM

SALEM is a totally software-based product and the unit can be interfaced to an IBM PC or compatible for calibration, configuration and monitoring. The firmware, consisting of the DSP and micro-controller code, resides on the micro-controller. The micro-controller up-loads the DSP code to the DSP on power up. The DSP computes all the basic parameters and the micro-controller manages the data and controls all the peripheral components. The meter does not use any trim potentiometers and calibration can be performed by software. Using the PC compatible software, all the parameters can be enabled or disabled for display on the meter. The Current Transformer (CT) and Potential Transformer (PT) ratios can be changed, so that the displayed values will be the actual values fed to the CT and PT. The  software enables a user to store the meter ID number. SALEM also provides as an option harmonic analysis and computes magnitude and phase information of all odd harmonics up to 11^th harmonic of all current and voltage channels. These values can be displayed on an external terminal using this software. SALEM uses a sequential sampling Analog-to-Digital-Converter and the delay in channel measurement is compensated by delay equalization software.