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9230A Series Precision DC Current Shunts Excellent as a Precision Current Shunt or Standard Resistor GUILDLINE INSTRUMENTS 9230A SERIES of precision DC current shunts are true 4-terminal devices intended for the precise measurement of DC current. They are constructed from specially selected elements supported on an insulating base for mechanical stability and covered with a perforated metal cover to allow proper cooling while providing physical protection for the elements. The design of the 9230A includes special features to reduce the effects of power dissipation and associated self heating errors. These shunts are designed to operate in air at full power. The type of material selected for the elements has a very low temperature coefficient and the size and number of elements chosen give the optimum surface area to dissipate the maximum specified power in air for a particular value. The performance of the 9230A shunts can be dramatically improved by operating them immersed in oil or 9230ASERIES FEATURES temperature baths. Extremely Low Self-Heating Effects The terminations of the shunts have been selected to give low thermal emf's and in the case of the higher current Low Temperature Coefficients values (i.e. 300 amperes and above), to ensure that the current applied is distributed in a constant manner, Low Thermal EMF's independent of how the connecting leads are arranged. Wide Dynamic Range The 9230A Series of Precision DC Current Shunts Controlled Current Distribution are true 4-terminal devices capable of the most Through The Element demanding measurements ofpreciseDCcurrent. < 10 ppm Long Term Stability The care and attention to the design of the 9230A's has Air or Oil Cooled Applications produced a series of shunts with a very wide dynamic range, virtually from zero to full rated current. The 9230A shunts Special Values Available On Request are also heat treated for excellent long term stabi