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Standard reference resistor
Model CER6000
Applications
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Primary standards for voltage and resistance in calibration
laboratories worldwide
■
Calibration reference for resistance and temperature
bridges, such as ohmmeters and AC or DC temperature
bridges
Special features
Calibration
WIKA data sheet CT 70.30
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High accuracy
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Excellent long-term stability
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Low temperature coecient
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Rugged stainless steel construction
Description
This model is available in two series: CER6000-RR
(reference resistor) and CER6000-RW (standard reference
resistor). The RR series of 4-wire reference resistors oer
high accuracy and stability at an economic cost. Designed
specically for use as a comparison standard for AC
thermometry resistance bridges of the ASL range, the RR
series may also be used in electrical standards laboratories.
In addition to standard xed values, resistors can be supplied
in any value between 1 and 1,000 Ω. Typical applications for
the RR series are as transfer standards or reference source
in temperature calibration or electrical standards laboratories.
Standard reference resistor, model CER6000, 10 Ω
The RW series is made from a specially selected alloy
having a low temperature coecient mounted in a strain-free
manner on formers made from a material of low dielectric
loss but of high mechanical stability.
Prolonged heat treatment of the elements ensures long-term
stability and low temperature coecient of resistance. The
elements are hermetically sealed in stainless steel containers
and lled with dry oil Castrol WOM 14.
WIKA data sheet CT 70.30
Data sheets showing similar products:
Precision thermometer; model CTR5000; see data sheet CT 60.20
Reference thermometer; model CTP5000; see data sheet CT 61.20
DC resistance thermometry bridge; model CTR6000; see data sheet CT 60.30
AC resistance thermometry bridge; model CTR6500; see data sheet CT 60.40
Calibration bath; models CTB9400 and CTB9500; see data sheet CT 46.20
∙ 05/2018
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Specications
Reference resistor, model CER6000-RR
Resistance value 1, 10, 25, 100, 300, 400, 500, 1.000 and 10.000 Ω
others on request
Tolerance ±10 ppm
Long-term stability < ±5 ppm per year
Temperature coecient < 1 ppm per °C
Frequency dependence < 1 ppm up to 400 Hz
Permissible ambient conditions
Working temperature 20 °C [68 °F]
Operating temperature 15 ... 40 °C [59 ... 104 °F]
Case
Dimensions Ø = 76 mm, height 114 mm [Ø = 2.99 in, height 4.49 in]
Weight 0.5 kg [1.1 lbs]
Standard reference resistor, model CER6000-RW
Resistance value 10, 25, 100, 400, 1,000 and 10,000 Ω
others on request
Tolerance ±10 ppm
Long-term stability 2 ppm per year (HS version 0.5 ppm per year)
Temperature coecient 2 ppm per °C (HS version 0.5 ppm per °C)
Frequency dependence 1 ppm up to 1,592 Hz
Permissible ambient conditions
Working temperature 20 °C [68 °F]
Operating temperature 15 ... 40 °C [59 ... 104 °F]
Case
Dimensions Ø = 76 mm, height 114 mm [Ø = 2.99 in, height 4.49 in]
Weight 0.7 kg [1.5 lbs]
1) No HS version is available for the resistance values 1 kΩ and 10 kΩ. Furthermore, it must be noted that with the 10 kΩ version the value changes from 2 ppm to 5 ppm.
1)
Certicates
Certicate
Calibration for model CER6000-RR Standard: without
Option: UKAS calibration certicate
Calibration for model CER6000-RW Standard: without
Option: UKAS calibration certicate or NPL calibration certicate DC or DC and AC
Recommended recalibration interval 1 year (dependent on conditions of use)
Approvals and certicates, see website
WIKA data sheet CT 70.30 ∙ 05/2018 Page 2 of 5
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V
Connections of the reference resistor, model CER6000-RR
Red Red
White White
VB
A
I
A
IB
Model CER6000-RR reference resistor with dierent
Model CER6000-RR reference resistor with 100 Ω
WIKA data sheet CT 70.30 ∙ 05/2018 Page 3 of 5
resistance range
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Standard reference resistor, model CER6000-RW (model Wilkins 5685)
The 4-pin standard reference resistors comply with the
highest specication and are suitable for DC or AC use up to
frequencies of several kHz. The range available now extends
from 1 ... 10,000 Ω.
The resistors are made from a specially selected alloy
having a low temperature coecient and are mounted in
a strain-free manner on formers made from material of
low dielectric loss but of high mechanical stability. All the
internal connections are welded for strength and a specially
developed aging technique is used to ensure the long-term
stability and low temperature coecient of resistance. The
elements are hermetically sealed in oil-lled stainless steel
enclosures.
Provision is made for inserting a thermometer to monitor
temperature but best performance is achieved when used in
an oil bath which is temperature controlled.
Maximum dissipation for the standard reference resistor
is 1 W but the highest performance will be obtained with
a dissipation of around 10 mW which is the ideal working
condition. No harm will occur if the dissipation is increased to
1 W but self-heating will take eect after a few minutes.
Background information
The design of these AC/DC standard reference resistors
is based on the collaboration with the UK national physical
laboratory.
The design originated with F. J. Wilkins whose name the
instruments still bear to this day. Wilkins resistors are ideally
suited for producing a most temperature-stable standard
reference resistor with minimum long-term drift, which is
suited for use with both direct and alternating current.
Since the introduction of these standard reference resistors
they have been adopted by many major industrial companies
as their primary resistance reference standards. Information
obtained from laboratories over the past twenty-ve years
indicate their exceptional high specication. With monitored
examples exhibiting stabilities within 1 ppm over a period of
ten years.
Selected high specication (HS)
During their manufacture some resistive elements exhibit
characteristics that show that with substantially increased
processing time, they will produce standards with stability
and temperature coecients superior to those specied for
the normal product. The standard reference resistors that can
be produced from these elements are oered as versions
“high specication”.
Standard reference resistor, model CER6000-RW
WIKA data sheet CT 70.30 ∙ 05/2018 Page 4 of 5
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Scope of delivery
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Model CER6000 standard reference resistor according to
specications
Option
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UKAS calibration of xed resistor
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NPL calibration of xed resistor, DC at 20 °C [68 °F]
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NPL calibration of xed resistor, DC at 23 °C [73 °F]
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NPL calibration of xed resistor, DC and one frequency
AC at 20 °C [68 °F] (please specify the frequency)
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NPL calibration of xed resistor, DC and one frequency
AC at 23 °C [73 °F] (please specify the frequency)
Accessories
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Model FA-4 2-terminal adapter for connecting RR resistors
to BNC (2 per pack)
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Thermal case for CER6000-RW resistors, at a xed
temperature of 36 °C [97 °F]
Thermal case for CER6000-RW resistors, at a xed
temperature of 36 °C [97 °F]
Ordering information
CER6000 / Accuracy / Value / Version / Calibration / Frequency / Accessories / Further approvals / Additional order information
© 11/2013 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modications to the specications and materials.
WIKA data sheet CT 70.30 ∙ 05/2018 Page 5 of 5
05/2018 EN
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de
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