Standard Resistors
Precision Non-Inductive Standard Resistors -
Grade 1 AC/DC Oil filled
(Types 1659, 1682 and 3111)
 These Resistance Standards are primarily designed for use with altering currents at power frequencies. They are equally suitable for use from d.c. to 1 kHz.
The Standard Resistors available in this range are from 0.0001 Ohm to 10,000 Ohm. For constructional reasons they 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 and 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.
For more information about this product contact Tinsley
Standard Range - Table 1
| |
Type |
R (Ω) |
I (A) |
n |
L/R |
W (Oil FiIIed) |
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 |
5576M |
0.0001 |
2,250 |
0.05 |
3 x 10 -6 |
500 |
water |
motor |
Key to Symbols
| |
|
|
|
R |
Nominal resistance in Ohm at 20 °C |
W |
Normal rating in Watts (overload capacity for no 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
Specifications - Table 2
See the table below for a run-down of this product's specifications.
Type |
Dimensions |
Net Weight |
1659 |
95x150mm |
1.8kg |
1682 |
140x230mm |
3.6kg |
3111 |
230x330mm |
10kg |
660M |
340 x 254 x 600mm |
25.8kg |
5576M |
340 x 254 x 600mm |
25.8kg |
For more information about this product contact Tinsley
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