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9350 Series
Hamon Type Resistance Transfer Standard
Maintenance Free Extreme Accuracy Resistance Transfers
GUILDLINE INSTRUMENTS MODEL 9350 ARE HAMON TYPE
Resistance Transfer Standards. They are used to make
very high accuracy resistance transfers. A set of 9350's
can be used to build up from a Thomas type 1 Ohm
standard up to 1 MegOhm.
Applications for the 9350 include performing linearity
and ratio accuracy tests on resistance bridges such as
the Guildline 6622A, 6675A and 9975 bridges. At
specific values the 9350 can also be used as a standard
resistor. For example, by a series parallel combination, a
25 ohm standard resistor can be set up which would
enable measurements with PRT's.
The 9350 contains 10 nominally equal resistors
permanently connected in series by specially designed
true four terminal junctions. Groups of resistors can be
connected in parallel or series parallel combinations to
9350 FEATURES obtain many values independent of the terminal blocks
and paralleling connectors to better than 5 parts in 10-8.
Transfer accuracy 0.05 ppm The 9350 (Hamon Type) Resistance Transfer
5 versions: Standard is used to make very high accuracy
10k to 1M, 1k to 100k resistance transfers.
100 to 10k, 10 to 1k
1 to 100 The various combinations are selected by a tapered plug
10 equal value precision resistors arrangement. This method has eliminated the use of
mercury wetted shorting bars common in earlier
Unique four terminal junctions
generation Hamon Type Resistance Transfer Standards.
Special tapered plug design The tapered plugs have a taper angle of a critical
avoids use of mercury shorting dimension which, while maintaining a low impedance,
bars allows the plugs to be easily removed or inserted. The
A Multi-value Standard Resistor taper angle is also designed to prevent cold welding of
the copper. A convenient storage area is provided for
Low maintenance the tapered plugs not in use.
The unique tetrahedral junction design allows transfers
of five parts in 100 million to be achieved. By measuring
each element to an accuracy of better than 1 part in 10-4,
100:1 ratio transfers can now be made to an accuracy of
better than 5 parts in 10-8 independent of junction
errors. For example, by use of a good quality 5