SWA : Lightweight Shunts, available in 50 & 100 mV
The
terminal blocks on the ammeter shunts are made of high quality brass to
allow proper heat dissipation and provide strong support for the entire
shunt. The resistance blades are made from manganin shunt metal for its
low temperature co-efficient, long-term stability and strength. The
manganin strips are soldered into slots in the brass terminal blocks
with high quality solder to provide a strong, lasting bond. Where
mounting bases are provided, high strength phenolic is used with
mounting holes designed in for ease of use.
Shunt Operation
For continuous operation,
it is recommended that shunts are not used at more than 2/3 of the
rated current under normal operation conditions. Shunts should be
located in an area where freely circulating air is available. If this
is not possible adequate forced ventilation should be provided to keep
the shunt operating temperature at 40° - 60°C. Shunt
temperature must be maintained under 145° C or a permanent
change in resistance will occur.
Shunt Quality
The Deltec DC Ammeter
shunt is designed to provide the highest quality performance possible
while maintaining their rugged construction characteristics. All Deltec
Co. current shunts are designed and calibrated at the factory to have
standard accuracy of ± 1/4%.
The MK series of electric current shunts are manufactured to meet the
stringent requirements of GSA federal CID-A-A-55524
specifications. This CID supersedes MILS161B.
All Deltec Ammeter Shunts are warranted
against defects in materials and workmanship for a period of 1 year. An ammeter
shunt is a very low-resistance
connection
between two points in an electric circuit that forms an
alternative path for a portion of the current. Shunt voltage drop is
used in
conjunction with an ammeter to measure amperage of a circuit.
Commercially manufactured shunts are typically available in either 50
or 100 millivolts.
Shunt Definition
An
ammeter shunt is a very low-resistance
connection
between two points in an electric circuit that forms an
alternative path for a portion of the current. Shunt voltage drop is
used in
conjunction with an ammeter to measure amperage of a circuit.
Commercially manufactured shunts are typically available in either 50
or 100 millivolts.
Shunt Operation
For continuous operation,
it is recommended that shunts are not used at more than 2/3 of the
rated current under normal operation conditions. Shunts should be
located in an area where freely circulating air is available. If this
is not possible adequate forced ventilation should be provided to keep
the shunt operating temperature at 40° - 60°C. Shunt
temperature must be maintained under 145° C or a permanent
change in resistance will occur.
Amp to Volt Relationship
Deltec DC ammeter shunts
are listed by Series Type, Amperage and Voltage Drop. For
example, an MKA-100-100 is a lightweight shunt, which will drop 100
millivolts at 100 amps with Deltec standard accuracy of plus
or minus 1/4%. 66 continuous operation amps is acceptable for
this shunt.
100 millivolts = (1/1000)*(100) Volt = .1Volt
50 millivolts = (1/1000)*(50) Volt = .05 Volt
Estimating Resistance
To estimate resistance of a Deltec Ammeter shunt one needs to apply
ohms law. For example an MKA-100-50 has an
approximate resistance of 0.0005 Ohms. This is
determined by V/I=R. (.05 V)/(100 A) = (R).
OHMS LAW
V= I x R
V = Voltage I = Amperage R = Resistance Power (Watts) = I^2 x R
Ohms
Law Calculator
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