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IET Labs HARS-LX Series Laboratory Standard Decade Resistance Substituter
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IET Labs HARS-LX Series Laboratory Standard Decade Resistance Substituter


IET Labs HARS-LX Series
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 IET Labs HARS-LX Series

Features:
  • High accuracy - 20 ppm
  • High stability - 5 ppm/yr
  • Low temperature coefficient - as low as 3 ppm/°C
  • High performance solid silver contact switches
  • Resistance from 10 mΩ to over 121 MΩ
  • 1 mΩ or optional 20 µΩ resolution
  • Hermetically sealed, low inductance resistors
  • Precise fixed minimum resistance

  Description

Highest accuracy version of the IET Labs resistance substituters for the most exacting calibration and test applications. Features a continuous rheostat as an option.

See HRRS Series for higher resistance
See HPRS Series for higher power
See RTD Series for RTD simulators
See PRS Series for programmable models

Optional Rheostat

For high resolution applications, a 10 mΩ rheostat may be added for the lowest step. It is a 20 µmΩ resolution “decade”. In order to eliminate contact resistance and thermal emf, the HARS-LX integrates the rheostat as shown. In this way, the wiper is in the low potential circuit, which is the high impedance lead. As a result, voltage and contact resistance effects are removed by being effectively added to the input impedance of the measuring instrument.

  Models, Options, & Accessories




  Specifications:

 

Description Highest performance decade resistance substituter with the tightest tolerance, stability, repeatability, and temperature coefficient..
Resistor Type Resistance wire for 0.1 steps and under; hermetically sealed, wirewound non-inductive resistors for 1 Ω steps and over.
Range 10 mΩ up to 12.1 MΩ in 1 to 10 decades.
Resolution 1 mΩ discrete steps; 20 µΩ continuous resolution rheostat; 1Ω mΩ full scale, option RH.
Initial Accuracy (absolute) <±(20 ppm + 0.5 mO); at 23°C, no zero subtraction required, 4-terminal, “true-ohm” measurement, SI traceable
Initial Adjustment Accuracy ±1 ppm for 10 kΩ steps; ±1.5 ppm for 100 kΩ steps; ±3 ppm for 1 MΩ steps.
(For increased accuracy of the 1 Ω to 1 MΩ decades, individual resistors for these decades are trimmable.)
Temperature Coefficient <±20 ppm/°C for 1 Ω steps and under;
<±15 ppm/°C for 10 Ω steps;
<± 3 ppm/°C for 100 Ω steps and over;
<± 50 µO/°C for wiring and switch resistance.
Stability <±(20 ppm + 0. 5 mΩ)/year; <±5 ppm/year, typical.
Minimum Resistance 10 mΩ ± 0.5 mΩ; limited by the lowest settable position, “1”, of the 10 mΩ/step decade.
Power Maximum 1 W per step up to 5 W total or 2 A max.
Calibration Conditions Four-terminal measurement, low power, at 23°C; 30% to 60% RH.
Switch Type 11 positions, "0"-"10", multiple solid silver alloy contacts,
with short term contact resistance repeatability of <100 µΩ.
Breakdown Voltage 1500 V peak to case
Power Coefficient <±1000 ppm/W for 0.1 Ω steps and under
<±400 ppm/W for 1 Ω steps
<±300 ppm/W for 10 Ω steps
<±100 pm/W for 100 Ω steps and over.
<+50 µΩ/W for wiring and switch resistance.
Terminals Low thermal emf beryllium copper binding posts with standard 3/4 inch spacing plus shield terminal; connection from the rear of the instrument is available as option RO.

Model
Dimensions
Weight
1 Decade
7.7 cm W x 7.7 cm H x 8.4 cm D
(3" x 3" x 3.3")
0.45 kg (1.0 lb)
2-4 Decades
37.5 cm W x 8.9 cm H x 10.2 cm D
(14.8" x 3.5" x 4")
1.7 kg (3.8 lb)
5 Decades
2.0 kg (4.3 lb)
6 and 7 Decades
43.9 cm W x 8.9 cm H x 10.2 cm D
(17.3" x 3.5" x 4")
2.2 kg (4.8 lb)
8 Decades
48.3 cm W x 17.8 cm H x 19.7 cm D
(19.0" x 7.0" x 7.8")
5.1 kg (13 lb)
9 and 10 Decades
11 Decades
48.3 cm W x 32.5 cm H x 27.0 cm D
(19.0" x 12.8" 10.5")
9.1 kg (20 lb)

Model
(0.01% Accuracy)
Total Res.
(Ω)
# of
Decades
Resolution
(Ω)
 
Model
(0.01% Accuracy)
Total Res.
(Ω)
# of
Decades
Resolution
(Ω)
HARS-LX-1-0.001
0.01
1
0.001
HARS-LX-5-0.001
111.11
5
0.001
HARS-LX-1-0.01
0.1
1
0.01
HARS-LX-5-0.01
1.1111 k
5
0.01
HARS-LX-1-0.1
1
1
0.1
HARS-LX-5-0.1
11.111 k
5
0.1
HARS-LX-1-1
10
1
1
HARS-LX-5-1
111.11 k
5
1
HARS-LX-1-10
100
1
10
HARS-LX-5-10
1.1111 M
5
10
HARS-LX-1-100
1 k
1
100
HARS-LX-5-100
11.111 M
5
100
HARS-LX-1-1K
10 k
1
1 k
HARS-LX-6-0.001
1.11111 k
6
0.001
HARS-LX-1-10K
100 k
1
10 k
HARS-LX-6-0.01
11.1111 k
6
0.01
HARS-LX-1-100K
1 M
1
100 k
HARS-LX-6-0.1
111.111 k
6
0.1
HARS-LX-1-1M
10 M
1
1 M
HARS-LX-6-1
1.11111 M
6
1
HARS-LX-2-0.001
0.11
2
0.001
HARS-LX-6-10
11.1111 M
6
10
HARS-LX-2-0.01
1.1
2
0.01
HARS-LX-7-0.001
11.11111 k
7
0.001
HARS-LX-2-0.1
11
2
0.1
HARS-LX-7-0.01
111.1111 k
7
0.01
HARS-LX-2-1
110
2
1
HARS-LX-7-0.1
1.111111 M
7
0.1
HARS-LX-2-10
1.1 k
2
10
HARS-LX-7-1
11.11111 M
7
1
HARS-LX-2-100
11 k
2
100
HARS-LX-8-0.001
111.11111 k
8
0.001
HARS-LX-2-1K
110 k
2
1 k
HARS-LX-8-0.01
1.2111111 M
8
0.01
HARS-LX-2-10K
1.1 M
2
10 k
HARS-LX-8-0.1
12.111111 M
8
0.1
HARS-LX-2-100K
11 M
2
100 k
HARS-LX-9-0.001
1.21111111 M
9
0.001
HARS-LX-3-0.001
1.11
3
0.001
HARS-LX-9-K-RM
1.21111111 M
9
0.001
HARS-LX-3-0.01
11.1
3
0.01
HARS-LX-9-0.01
12.1111111 M
9
0.01
HARS-LX-3-0.1
111
3
0.1
HARS-LX-10-0.001
12.11111111 M
10
0.001
HARS-LX-3-1
1.11 k
3
1
HARS-LX-11-0.001
121.11111111 M
11
0.001
HARS-LX-3-10
11.1 k
3
10
 OPTIONS
- RH 10 mΩ rheostat for lowest decades, 20 µO resolution.
- RO Rear output binding posts
HARS-LX-3-100
111 k
3
100
HARS-LX-3-1K
1.11 M
3
1 k
HARS-LX-3-10K
11.1 M
3
10 k
HARS-LX-4-0.001
11.11
4
0.001
HARS-LX-4-0.01
111.1
4
0.01
HARS-LX-4-0.1
1.111 k
4
0.1
HARS-LX-4-1
11.11 k
4
1
HARS-LX-4-10
111.1 k
4
10
HARS-LX-4-100
1.111 M
4
100
HARS-LX-4-1K
11.11 M
4
1 k


   
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