Resistance Standards

Tinsley Standard  Resistors

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

Model 5685 AC/DC Standard Resistors

The design of these AC DC Standard Resistors is based on work carried
out  over several years with co-operation of the National Physical
laboratory. The  design originated with F. J. Wilkins of the N.P.L. and has
evolved as the result  of many tests on stability and temperature
coefficient using both a.c. and  d.c. Some of the original design features
have been discarded in the interests  of simplicity, notably the horns
which are no longer considered necessary.

The aim has been to produce
four-terminal Standard Resistors to the
highest  specification, suitable for a.c.
and d.c. work up to a frequency of
1592 Hz.  1 Ohm to 10,000 Ohms.
The Resistors are made from a
specially selected alloy  having a low
temperature coefficient mounted in a
strain free manner on formers  made
from material of low dielectric loss
but of high mechanical stability. 
All the connections are welded. Prolonged heat treatment of the elements
ensures  long term stability and low temperature coefficient of resistance.

The elements are hermetically sealed in stainless steel containers which 
are filled with dry oil (Castro! Whitemor WOM14). Provision is made for
inserting  a thermometer but the resistors are intended to be used in an oil
bath which  is temperature controlled.

For more information, see the manufacturer's site:
www.tinsley.co.uk/products/standard-resistors/index.html

Standard Resistors Type 5615 and 5686

5615 High Value Resistance Standards These high resistance value Standard Resistors are of similar appearance  to the Type 5685/5686 Series, but of higher resistance value. The resistance elements are specially wound in a strain-free manner from  selected precision resistance alloy. These resistors can be supplied with a  NAMAS Certificate.

5686 Low Value Resistance  Standards

These four-terminal Standard Resistors  are for direct current use and
have three nominal values: 0.001, 0.01, 0.1  Ohms. They are sealed into
stainless steel cases and oil filled.
These resistors are suitable for air  cooling or for use in a temperature
controlled enclosure or oil bath for  greater stability.
The resistance elements are made from  selected manganin which is heat
treated to improve stability and to reduce  temperature coefficient. Joints
are silver soldered with copper being used  for connections to the
terminals. The insulating material is high grade phenolic  and the panel is
fitted to the stainless steel can by means of an '0' ring.
For most accurate work the recommended  wattage dissipation is
10 milli-watts but up to 1 Watt may be dissipated  without harm to the
elements. (In the case of the 0.001 Ohm Resistor the  current should not
exceed 10 amperes, 100 milli-watts).

For more information, see the manufacturer's site:
www.tinsley.co.uk/products/standard-resistors/index.html

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 range of Standard Resistors
available in this range is from 0.0001
Ohm  to 10,000 Ohms.  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.

For more information, see the manufacturer's site:
www.tinsley.co.uk/products/standard-resistors/index.html

View other products of the manufacturer:
www.tinsley.co.uk/products/standard-resistors/index.html

IET Labs, Inc. Resistance Standard

Primary Resistance Standard
Model SR102 - Primary Resistance Standard
(100 Ohm)

Description:
The  SR102 is a highly stable and accurate (1ppm), 100, resistance
standard. SR102 Standards are equipped for five-terminal
measurements used for Standard Resistor readings and for
Temperature Sensor readings. Calibration data, which identifies the
Standard Deviation, and the Temperature Characteristics is
supplied with each unit. In addition, each unit is equipped with a thermal
well so that the exact temperature of the resistance standard is known.
This allows the user to make highly precise, temperature compensated,
measurements.
Features:
Long Term Stability of Resistance Standard... typically less than
0.2 ppm per year; Temperature Coefficients... less than 0.1 ppm per
degree Celsius at 23 degrees C; Initial Accuracy... ± 1 PPM; Units
can be supplied without cases for use in oil baths; 1 year warranty.

Applications:
Primary Calibration Laboratory
Standard to be transported directly
to NIST or a NIST-Traceable
Calibration Facility (TEGAM, Inc.);
To calibrate Transfer Standards and
Resistance Bridges for
NIST-Traceable. Calibrations; Can
be used outside of controlled
laboratories, or environments by
monitoring the temperature of
the unit.

For more information, see the manufacturer's site:
http://www.ietlabs.com/esi/ESIProducts.html

Resistance Transfer Standard
Model SR1010 - Resistance Transfer Standard
(1 to 100k Ohm/Step)

Description:
The  SR1010 transfer standard consists of 12 equal resistance
steps. These steps are available in increments of 1 (SR1010-1),
10 (SR1010-10), 100 (SR1010-100), 1k (SR1010-1k), 10k (SR1010-10k)
and 100k (SR1010-100k). The Model SR1010 provides
four-terminal connections for each step or for series and parallel
combinations of these resistance steps using the optional
Series-Parallel (SPC102), Parallel Compensation Networks (PC101)
and shorting bars (SB103). This improves power dissipation, stability
and errors due to variance in temperature.
Features:
> Initial Accuracy... ± 20PPM of nominal value matched within 10PPM
> Transfer Accuracy... ± (1PPM + 0.1u at parallel value) for 100:1
> Transfer Accuracy... ± (1PPM + 1u at series parallel value) for 10:1
> Long Term Accuracy... ± 50PPM of nominal value
> Calibration Accuracy... ± 10PPM
> 1 year warranty

Applications: > Calibration of Working Standards and Precision Resistance Measuring Systems > Reference Voltage Divider > Used to transfer NIST traceability to different values of Resistance

For more information, see the manufacturer's site:
http://www.ietlabs.com/esi/ESIProducts.html

Working Resistance Standards
Model SR1-XX - Secondary (Working) Resistance
Standards (0.01 to 10M Ohm)

Description:
The IET Model SR1-XX offers an accurate, stable, versatile
working standard. Long term accuracy of most values is ± 50PPM.
These standards are designed to minimize series inductance and
shunt capacitance. Terminal binding posts are located on the top of the
unit and are brought through the bottom of the unit where removable
banana plugs may be connected. Thus, four-terminal measurements
can be made. This configuration also allows for one or more Model
SR1 Standard Resistors to be connected in parallel or in series for
a variety of resistance values by stacking resistors.

Features: > Standard Values: 1, 10, 100, 1k, 10k, 100k, 1M, 10M > Initial Accuracy..± 20PPM (1 through 100k) > Long Term Accuracy..± 50PPM (1 through 100 K) > Calibration Accuracy..± 10PPM (1 through 100K) Applications:  Used as a laboratory resistance standard for calibration or verification of resistance measuring systems.

For more information, see the manufacturer's site:
http://www.ietlabs.com/esi/ESIProducts.html

MI DC Metrology

With over 15 years of experience, MI is the leading supplier of DC
Resistance Measurement Systems and DC Standards around the world.
Our broad line covers resistance measurements from 1µO to 100T
ohms, and voltage measurements from a few micro volts to
1200 volts DC.
If you're visiting us from a National Laboratory, Nuclear Laboratory,
Calibration Laboratory, Aerospace, Telecommunications,
Semiconductor, Electrical, or the Pharmaceutical Industry  take a
moment to review our DC Metrology Line, and put our accuracy, stability
and reliability to measure for your  organization

Temperature Stabilized Resistance Standard Temperature Controlled 9 Element Resistance Standard

Model 4310

General Description:
The Model 4310, a nine-element resistance standard is the latest
development from Measurements Internationals’ series of DC resistors
and shunts. After many years of research in resistance materials, the
Model 4310 insures that you get the best performance on the market
today. Combined with MI’s experience in automated resistance
measurements the 4310 is used as a temperature controlled, 9-element
working resistance reference.

Quantum Hall Resistance System

Model 6800 - QuantW

Transportable & Affordable, QHR Standard, Manual or IEEE488
Controlled, Vxx and Vxy Measurements, Accuracy to 0.02 PPM,
Modular "Turn-Key" System, Direct Transfer to 1 and 10KW Std.

General Description: The Quantized Hall Resistance Standard is internationally recognized as the representation of the ohm and is the most stable resistance standard known. Many developing countries and industries are finding a need to provide highly accurate, traceable reference standards in support of their "hi-tech" environments. The QuantW system has  been developed to meet the needs of National Laboratories and Primary Industrial Laboratories around the world.

Come to know the entire palette of products.
For more information, see the manufacturer's site:
www.mintl.com/leftProducts_DCmetrology_DCcurrent.htm