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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 stability.
Operated below 30% of rated current, and maintained in a
Forced Convection Option Available constant temperature oil bath, the 9230A's stability enables
Improves Power Dissipation it to be used as a standard reference resistor.
Special values in the range of 1 ohm to 50
on request. Guildline can also produce custom value shunts
to meet special customer requirements.
The 92310 forced convection unit with power supply is
made available as an accessory to allow operation on the
bench top at up to 100W dissipation with much improved
repeatability and power coefficient performance.
The 9230A-15R is made available as a direct replacement for
the older version model 9230/15 shunt. Our best seller is
the NEW 30 Amp model that has the same ohmic value as
SHOWN WITH OPTIONAL the old series 9230-15 but can handle twice the current (up
to 30 Amps (with the optional 92310 Forced Air Unit)!
92310 FORCED AIR UNIT
9230A Series of Precision DC Current Shunts
9230A Series Specifications
Nominal 1 Initial 2 Maximum Current (A) 3 12 Month Stability (