ELECTRONICS UPGRADE TO THE SAVANNAH RIVER NATIONAL LABORATORY COULOMETER FOR PLUTONIUM AND NEPTUNIUM ASSAY Page: 4 of 11
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SRNL Coulometer Electronics Upgrade
Figure 1: Coulometer 6 Layer PC Board
Multi-pin connectors were used for supplying the digital outputs from the AgilentTM 34980A data acquisition
system. The digital outputs feed drivers chips and operate the coil on each KotoTM relay. Each cell electrode can
connected independently of the others, allowing for automated testing for high leakage current.
To maximize heat dissipation of the load resistors, five 100-Ohm, 25-Watt resistors were combined in parallel to
create a net 20-Ohm load. For the calibration resistor two 100-Ohm Julie Research resistors were combined in
parallel to create an equivalent 50-Ohm calibration resistor. The combined effect allows for linear response
across the normal operating range of the instrument, with optimum performance in the 5 mA to 500 mA range.
The calibration resistor is measured in circuit with an uncertainty of +/- 0.0015%.
Figure 2 shows the entire coulometer system which includes:
" Uninterruptible Power Supply
" DC Power Supply Chassis
" AgilentTM 34980A Data Acquisition Chassis
" Laptop with a National InstrumentsTM PCMCIA IEEE-488 Interface
" Coulometer Chassis
The system is powered from 120 VAC or 230 VAC. A single triple-twisted cable connects from the coulometer
chassis to the coulometer cell. The laptop communicates with only the AgilentTM 34980A chassis via the IEEE-
488 card. The HT Basic software has been upgraded to Trans EraTM HT Basic V10, runs on Windows XPTM or
Windows 7TM. The software is generic for all users except for five configuration files:
" Method Parameters
" Cell Type
" Instrument Parameters
" DVM Calibration
" Analog Output Calibration
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Cordaro, J.; Holland, M.; Reeves, G.; Nichols, S. & Kruzner, A. ELECTRONICS UPGRADE TO THE SAVANNAH RIVER NATIONAL LABORATORY COULOMETER FOR PLUTONIUM AND NEPTUNIUM ASSAY, article, July 8, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc840511/m1/4/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.