ASR Series
Primary Standard Resistor
FEATURES
• Excellent long-term stability of resistance, less than
3 ppm/year
• Low temperature coefficient, less than 0.2 ppm/°C
• The resistance value may be specified from 1Ω to
10 MΩ
• Excellent AC characteristics due to non-wirewound
technology
• Compact and sturdy construction designed for easy
operation and storage
• Certificate of Calibration and Inspection sheets
traceable to NMIJ* are provided at shipment.
*NMIJ: National Metrology Institute of Japan
MASS
Approx. 2.5 kg (5.5 lbs)
DESCRIPTION
The ASR series is an extremely stable standard resistor.
Alpha’s Ni/Cr alloy Bulk Metal
®
Foil technology is used
as the resistive element, providing high stability and
low temperature coefficient. The process of building a
standard resistor requires significant experience and a
great degree of skill. Due to our long-term experience
in developing and enhancing ultra stable Bulk Metal
®
Foil technology, we are able to provide products with
consistency of performance under strict quality control.
With the extreme stability of this resistor relative to
temperature change, the ASR can be used in air without
oil bath or critical environmental temperature control
eliminating added expense and maintenance problems.
The ASR is designed to be used in a broad range of
environments—from a production floor for making precise
measurements, to a corporate traceability system as a
calibration and reference standard.
The resistors are mounted in a compact sturdy box with
cover whose construction is designed to protect the
resistor and terminals from any damages.
CONFIGURATION
in millimeters
19.05 38.1 19.05
112
76
36
155
97
SPECIFICATIONS
Series
Uncertainty
Temp.
Temp.
of
Nominal Accuracy
Coefficient Retrace
Calibration
Value
ppm
ppm
ppm/°C
ppm
Stability
ppm/yr
Power
Rating
Power
Coefficient
ppm/power*
Max.
Max.
Max. Operating Storage
Working Working Working Temp.
Temp.
Temp.
Current Voltage
Range
Range
°C
Number
of
Terminals
W
0.5
mA
707
100
31.6
V
0.70
1.00
3.16
10.0
31.6
100
316
1000
°C
°C
ASR-1R0
ASR-100
ASR-101
ASR-102
ASR-103
ASR-104
ASR-105
ASR-106
1Ω
10Ω
100Ω
1kΩ
10kΩ
100kΩ
1MΩ
10MΩ
±10
±5
±0.5
±6
±5
±2.5
@ 23°C
±2 @
±0.2
23~0°C
@ 0~23°C
23~50°C ~23°C
23~50°C
~23°C
±3
±5
5
0~50
–10~60
0.1
±1
50
10.0
3.16
1.00
0.31
3
±3
0.10
* Power=Power rating
Document No.: 67022
Revision: 30-Mar-2015
For any questions, contact
sales-alpha@alpha-elec.co.jp
www.alpha-elec.co.jp
1
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