RESISTANCE STANDARDS
ULTRA STABLE
↓
RESISTORSꢀCAPACITOR
S
ꢀ
C
OILSꢀDELAY LINES
1.5 [38]
Model A1B
Model A2
.75 [19]
←
→
→
←
2” [50.8]
↑
↑
Term.W is
5.5
[140]
A SERIES
RoHS
2.5 [63.5]
compliant
RoHS
↓
RCDA2SN1060
100 OHM
1.25 [31.8]
Dimensions
Inch [mm]
↑
←
→
4.5 [114]
↓
ꢀ Designed for use as DC Resistance Standards in
industrial, research, and metrology laboratories
ꢀ Standards are individually tested and certified to
the National Institute of Standards and Technology
ꢀ Accuracies to ±0.0005%!
ꢀ Choice of models: A1 offers utmost precision and
stability for ‘primary standard’ applications, A2 offers
economical ‘secondary standard’ performance
ꢀ Values from 0.01Ω to 1MΩ are standard (any
decade or intermediate value can be offered on a
custom basis from 0.001Ω to 1013Ω, consult factory)
ꢀ Low thermal EMF and voltage coefficients
ꢀ RCD standards lab offers recalibration services
ꢀ Low temperature coefficient (approx. 10ppm/°C)
ꢀ Operating temperature: 0°C to +40°C
RCD - The standard by which others are measured!
RCD has been manufacturing precision resistors for more than 30 years, which
have evolved into some of the most precise and stable standards available
worldwide, up to 10 times more accurate than competitive models!
Series A1: Made of premium resistance wire, wound on insulated brass spools for
precise matching of TCE, and pre-conditioned to assure utmost stability. The element is
immersed in moisture-free oil inside a sealed metal container. Available in two grades,
A1A to ±0.0005% and A1B to ±0.001%. A1A standards are not only traceable to the
NIST, but also include a computerized TC chart giving corrections for every 0.01°C
from 18 to 30°C. Series A1 are provided with a thermometer well at the center of the
standard. As an option, a 100Ω platinum RTD element (RCD type PTF1 accurate to
0.1°C) can be imbedded in the midst of the resistance windings. Heavy duty leads
enable series/parallel connections without compromising the guaranteed limit of error.
Series A2: Precision resistors with 4-terminal brass binding posts designed for
less critical applications such as secondary reference standards. Molded low-
profile case with flexible internal insulation protects the resistance element from
damage even when exposed to non-laboratory environments, such as production
or R&D departments. Gold plated binding posts available.
ꢀ Low cost 2-terminal banana plug standards avail.
A1 SPECIFICATIONS
Accuracy of
Measured Value*
Power Coef.*
(ppm/mW)
Measured
Value
Resolution
Nom. Tolerance
Long Term Stability**
Resistance
Value
Wattage
Rating
Current
Rating
A1A
A1B
A1A
A1B
A1A
A1B
A1A
A1B
±0.05% (.01%
avail)
0.1Ω
1.0Ω
10Ω
±0.005%
±0.0005%
±0.0005%
N/A
0.0000001Ω
0.000001Ω
0.00001Ω
0.00001Ω
0.0001Ω
0.0001Ω
0.001Ω
5ppm
10ppm
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
3.2A
1.0A
.32A
.14A
.1A
1-5ppm
2-10ppm
.002
.001
.001
N/A
.010
.005
.005
.005
.005
.005
.005
.005
±0.003%
(.001% avail)
3ppm
4ppm
-
10ppm
10ppm
10ppm
10ppm
10ppm
10ppm
10ppm
0.5-3ppm
0.5-3ppm
N/A
1-5ppm
1-5ppm
1-5ppm
1-5ppm
1-5ppm
1-5ppm
1-5ppm
±0.003%
(.001% avail)
±0.003%
(.001% avail)
50Ω
±0.003%
(.001% avail)
100Ω
400Ω
1KΩ
10KΩ
±0.0005%
N/A
4ppm
-
0.5-3ppm
N/A
.001
N/A
±0.003%
(.001% avail)
.05A
.032A
.01A
±0.003%
(.001% avail)
±0.0005%
±0.0005%
5ppm
7ppm
0.5-3ppm
0.5-3ppm
.001
.001
±0.003%
(.001% avail)
0.01Ω
A2 SPECIFICATIONS
HOW TO ORDER:
Standards can be ordered as complete
sets or individually. SET-A1A has six
A1A standards (0.1Ω, 1Ω, 10Ω, 100Ω,
1K, 10K). SET-A1B has eight A1B
standards (0.1Ω, 1Ω, 10Ω, 50Ω, 100Ω,
400Ω, 1K, 10K). SET-A2 has eleven A2
standards (0.01Ω, 0.1Ω, 1Ω, 10Ω, 50Ω,
100Ω, 400Ω, 1K, 10K, 100K, 1M). Order
individual standards by denoting the
model number and value, e.g. “A1A - 1
OHM”, “A1B - 10K”, “A2 -1M”. Indicate
non-standard tolerances, e.g. “A2 - 1
OHM .005%”. Lead-free RoHS-
Measured Accuracy
Resistance
Value
Nominal
Tolerance
Wattage Current Long Term Power Coef.
Rating Rating Stability** (ppm/mW) *
Value
Resolution
of Meas.
Value*
0.01Ω
0.1Ω
1.0Ω
±0.05% (.01% avail)
±0.03% (.01% avail)
±0.01% (.005% avail)
0.000001Ω
0.00001Ω
0.0001Ω
200ppm
50ppm
20ppm
1.0W
1.0W
1.0W
10A
3.2A
1A
20-100ppm
10-50ppm
5-25ppm
0.5
0.3
0.3
10Ω
50Ω
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
±0.01% (.005% avail)
0.001Ω
0.001Ω
0.001Ω
0.001Ω
0.01Ω
0.1Ω
20ppm
20ppm
20ppm
20ppm
20ppm
20ppm
50ppm
200ppm
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
1.0W
.32A
.14A
5-25ppm
5-25ppm
5-25ppm
5-25ppm
5-25ppm
5-25ppm
5-25ppm
10-50ppm
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
100Ω
400Ω
1KΩ
.1A
.05A
.032A
.01A
compliant design is available by adding
“W” to end of p/n. Custom values are
available.
10KΩ
100KΩ
1MΩ
1.0Ω
.0032A
.001A
10.0Ω
* Tested at 25±0.05°C in a well stirred oil bath at <100mW (5ppm=.0005%, 10ppm=.001%, etc.)
**Typical stability under conditions of normal use over 1 year period.
-
-
-
-
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603 669 0054 Fax: 603 669 5455 Email:sales@rcdcomponents.com
FA044A Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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