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HARS-X Series

Page 1 of 2

High Accuracy Decade

Resistance Substituter

HARS-X Catalog Pages/Feb. 2021

Accuracy:

≤1 MΩ decades: ±(0.01% + 2 mΩ)

10 MΩ decades: ±0.03%

after subtraction of zero resistance, at 23°C;

traceable to SI

Zero resistance:

≤1 MΩ decades: <1 mΩ per decade at dc

10 MΩ decade: ≈3 mΩ at dc

Max voltage to case:

2000 V peak

Environmental conditions:

Operating: 10°C to 40°C; <80% RH

Storage: -40°C to 70°C

Switches:

Continuous rotation

11 positions marked "0"-"10"

Multiple solid silver-alloy contacts

Tight-tolerance, laboratory-grade decade

subs•tuters, for applica•ons requiring a

cost-effec•ve, high-performance resis-

tance decade box.

SPECIFICATIONS

6 Decade HARS-X High Accuracy Resistance Substituter

Resistance

per step

Total

decade

resistance

Stability

(±ppm/yr)

Long-term

stability

(±ppm/3 yrs)

Temperature

coefficient

(±ppm/°C)

Resistor type

HARS-X

HARS-X2

Max

current

Max

voltage

(per step)

Max power

(per step)

Max

current

Max

voltage

(per step)

Max power

(per step)

1 mW

10 mW

50

75

50

Resistance wire

8.0 A

5 mV

0.04 W

9.0 A

9 mV

0.08 W

10 mW

100 mW

50

75

20

4.0 A

40 mV

0.16 W

6.3 A

63 mV

0.4 W

100 mW

1 W

50

75

20

1.6 A

0.16 V

0.25 W

2.2 A

0.3 V

0.5 W

1 W

10 W

20

25

20

Wirewound, non-

inductive

0.8 A

0.8 V

0.6 W

1.1 A

1.1 V

1.2 W

10 W

100 W

20

25

15

0.25 A

2.5 V

0.6 W

0.35 A

3.5 V

1.2 W

100 W

1 kW

20

25

5

80 mA

8 V

0.6 W

110 mA

11 V

1.2 W

1 kW

10 kW

20

25

5

23 mA

23 V

0.5 W

35 mA

35 V

1.2 W

10 kW

100 kW

20

25

5

7 mA

70 V

0.5 W

11 mA

110 V

1.2 W

100 kW

1 MW

20

25

5

2.3 mA*

230 V*

0.5 W*

3 mA*

500 V*

1 W*

1 MW

10 MW

20

25

5

0.7 mA*

700 V*

0.5 W*

1 mA*

1000 V*

1 W*

10 MW

100 MW

50

100

10

Metal oxide film

0.1 mA*

1000 V*

0.1 W*

0.1 mA*

1000 V*

0.1 W*

*Subject to maximum of 2000 V to case

Mechanical:

Model

Dimensions

Weight

1 decade

(9.5 cm W x 8.3 cm H x 11.0 cm D)

3.75" x 3.25" x 4.33"

0.45 kg 1 lb

2-3 decade

(31 cm W x 8.9 cm H x 10.2 cm D)

12.2" x 3.5" x 4"

1.7 kg 3.8 lb

4-5 decade

(37.6 cm W x 8.9 cm H x 10.2 cm D)

14.8" x 3.5" x 4"

2.0 kg 4.3 lb

6-7 decades

(43.9 cm W x 8.9 cm H x 10.2 cm D)

17.3" x 3.5" x 4"

2.4 kg 5.3 lb

8-9 decades

(48.3 cm W x 17.8 cm H x 17.8 cm D)

19" x 7" x 7"

3.5 kg 7.7 lb

10-11 decades

3.7 kg 8.1 lb

Features:

• Resistance from 1 mΩ to 111 MΩ

• Available in double-power version: HARS-X2

• Wide choice: single through 11 decade units

• High-accuracy: 0.01% (100 ppm)

• Very low zero-resistance: <1 mΩ per decade

• High-performance solid silver-alloy switches

• Low temperature coefficient: 5 ppm/°C

• Non-induc•ve or low-inductance resistors

• Rack moun•ng available

• Special and custom configura•ons available

See also:

• Higher accuracy: HARS-LX Series

• Higher power: HPRS Series

• Higher resistance: HRRS Series

• Higher voltage: HRRS-5kV and HRRS-10kV Series

• RTD simulators: RTD Series -- without zero subtrac•on

• Programmable models: PRS Series

Ne

w

Switch capacitance:

<1 pF between contacts

Terminals:

3 terminals, High, Low, and

GND via gold-plated, 5-way,

tellurium-copper binding

posts with low thermal emf

and low resistance.

-K option with 5 terminals

for Kelvin connection is

available as an option to

reduce zero resistance.

-K option is not available for

1 decade housing.

-RO Rear outputs are

available as an option.