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STANDARD NON INDUCTIVE RESISTORS
Precision Non-Inductive Standard Resistors  AC DC Oil filled 

1659, 1682 and 3111 Precision Non-Inductive Standard Resistors  Grade 1 AC/DC Oil filled 
These Resistance Standards are primarily designed for use with altering currents at power frequencies. 

They are equally suitable for use from DC to 1 kHz. 

 The design of our standard resistors is based
on work carried out over many years with the
co-operation of the National Physical Laboratory.
Much of the design originated with FJ.Wilkins
of the NPL. 

Standards are in use by many of the
National and Industrial Standards Laboratories
throughout the world

The range of resistors available is from 0.0001 ohm to 10,000 ohms. For constructional reasons these resistors have been divided into four groups. The units of each group are of similar mechanical design and dimensions which have been determined with consideration for a common upper limit for heat dissipation and current carrying capability. 

The resistance material is manganin (Cu-Ni-Mn alloy). The resistors are built into cylindrical metal containers for oil immersion to ensure uniformity of temperature, the 10 and 50 watt units are air cooled and fitted with a hand operated mechanical oil stirrer.
The 200 watt units are water cooled and provided with a pulley to drive the mechanical oil stirrer. 

The 500 watt units are also water cooled but are fitted with a motor for direct drive of the stirrer. 
The terminal arrangements provide for separate current and potential terminals for use with a potentiometer or DVM. 

The available standard ranges and electrical performance data are set out in Table 1. 
Modified resistance units can be quoted to meet special requirements. 
Dimensional and other details are shown in Table 2.

N.B. - These standards are not filled with oil when supplied. 
The recommended oil is Castrol Whitemor WOM14 or if not obtainable any high quality non- corrosive oil can be used such as high quality Transformer Oil.

 

Table 1

Standard Range
Type R I n L/R W (Oil Flied)  C  S
1659 10000 0.03 0.02 1 x 10-6 10  air hand
1659 5000 0.045 0.02 1 x 10-6 10  air hand
1659 1000 0.1 0.02 1 x 10-6 10  air hand
1659 200 0.22 0.02 1 x 10-6 10  air hand
1659 100 0.3 0.02 1 x 10-6 10  air hand
1659 10 1.0 0.02 1 x 10-6 10  air hand
1659 5 1.4 0.02 1 x 10-6 10  air hand
1659 2 2.2 0.02 1 x 10-6 10  air hand
1659 1 3.0 0.02 1 x 10-6 10  air hand
1659 0.5 4.5 0.03 1 x 10-6 10  air hand
1659 0.2 7.0 0.03 1 x 10-6 10  air hand
1682 0.2 15 0.03 1 x 10-6 50  air hand
1682 0.1 22 0.03 1 x 10-6 50  air hand
1682 0.05 30 0.03 1 x 10-6 50  air hand
1682 0.02 50 0.03 1 x 10-6 50  air hand
3111 0.02 100 0.03 1 x 10-6 200 water pulley
3111 0.01 140 0.05 3 x 10-6 200 water pulley
3111 0.005 200 0.05 3 x 10-6 200 water pulley
660M 0.001 700 0.05 3 x 10-6 500 water motor
5576M 0.0005 1,000 0.05 3 x 10-6 500 water motor
5576MM 0.0001 2,250 0.05 3 x 10-6 500 water motor

Key to Symbols
R Nominal resistance in Ohms at 20°C W Normal rating in Watts (overload capacity for not more than 10 minutes is 25% * when oil filled
I Full rated or 'normal' current in Amps C Method of cooling. (2 gals/min for minimum water cooling)
n Maximum resistance error in percent of nominal resistance for any current up to full rated current S Method of mechanical stirring (Pulley to be driven at approx. 1,000rpm) Motor : - 240v 50Hz.
L/R Time constant in seconds measured at 1kHz. *  if this current is exceeded the calibration may be affected


Table 2

SPECIFICATION
TYPE DIMENSIONS NET WEIGHT
1659 95x150mm 1.8kg
1682 140x230mm 3.6kg
3111 230x330mm 10kg
660M 340 x 254 x 600 mm 25.8 kg
5576M 340 x 254 x 600mm 25.8 kg

Please email sales@hotektech.com or call 253-927-6186 if you are interested in a purchase, or
  need additional information.

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