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IET Labs HARS-X Series High Accuracy Decade Resistance Substituter
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IET Labs HARS-X Series High Accuracy Decade Resistance Substituter


IET Labs HARS-X Series
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 IET Labs HARS-X Series

Features:
  • Resistance from 1 mΩ to 111 MΩ
  • Excellent stability - 10 ppm/yr, 25 ppm/ 3 yrs
  • 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
  • Noninductive or low inductance resistors
  • Rack mounting available
  • Special and custom configurations available

  Description

Tight tolerance laboratory grade decade substituters, for applications requiring a cost effective high performance resistance decade box.

Single Decade Units
Single decade units are available with resistance as low as 1 mΩ per step to as high as 10 MΩ per step. These units satisfy many system applications requiring only a single decade while maintaining all the quality features of the HARS series. Each decade is enclosed in an aluminum case which can serve as a shield.

It may be panel mounted and integrated with additional units to form potentiometer cir uits or other configurations. Each unit consists of low inductance resistors in series, with a high performance solid silver alloy contact switch.

See HRRS Series for higher resistance
See HPRS Series for higher power
See HARS-L Series for higher accuracy
See RTD Series for RTD simulators
See PRS Series for programmable models

  Models, Options, & Accessories




  Specifications:

Resistance
per
Step
Total
Decade
Resistance
Stability
(±ppm/year)
Long Term
Stability
(±ppm/3 yrs)
Temperature
Coefficient
(±ppm/°C)
Max.
Power
(W/step)
Maximum
current
(per decade)
Maximum
voltage
(per step)
1 mΩ
10mΩ
100
700
50
0.025
5 A
5 mV
10 mΩ
100 mΩ
50
350
20
0.2
4 A
40 mV
100 mΩ
1 Ω
30
50
20
0.25
1.6 A
0.16 V
1 Ω
10 Ω
10
25
20
0.6
0.8 A
0.8 V
10 Ω
100 Ω
10
25
15
0.6
0.25 A
2.5 V
100 Ω
1 kΩ
10
25
5
0.6
80 mA
8 V
1 kΩ
10 kΩ
10
25
5
0.5
23 mA
23 V
10 kΩ
100 kΩ
10
25
5
0.5
7 mA
70 V
100 kΩ
1 MΩ
10
25
5
0.5*
2.3 mA*
230 V*
1 MΩ
10 MΩ
10
25
10
0.5*
0.7 mA*
700 V*
10 MΩ
100 MΩ
25
40
10
0.1*
0.1 mA*
1000 V*
* Subject to maximum of 2000 V.

Accuracy After subtraction of zero resistance, at 23°C; traceable to NIST.
HARS-L: ± 20 ppm
HARS-Z: ±(50 ppm + 1 mΩ)
HARS-X: ±(0.01% + 2 mΩ)
HARS-A: ±(0.05% + 2 mΩ)
HARS-Q: ±(0.02% + 2 mΩ)
HARS-B: ±(0.1% + 4 mΩ)
Zero Resistance <1 mΩ per decade, at dc; slightly higher for 7-10 decades.
Maximum Voltage to Case: 2000 V peak.
Operating Environment: +10 to 40°C, <80% RH.
Switch Type: 11 positions; "0"-"10"; multiple solid silver alloy contacts.
Switch Capacitance: <4 pF per switch.
Terminals: Low-thermal-emf beryllium-copper binding posts with standard 3/4 inch spacing, plus shield terminal; connections from the rear of the instrument are available with RO option. Solderterminals for single decade units.

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 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)
7 Decades
2.4 kg (5.3 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")
2.6 kg (5.7 lb)
9 Decades
5.1 kg (11.2 lb)
10 Decades
5.3 kg (11.7 lb)
11 Decades
5.4 kg (11.9 lb)

Model
(0.01% Accuracy)
Total Res.
(Ω)
# of
Decades
Resolution
(Ω)
 
Model
(0.01% Accuracy)
Total Res.
(Ω)
# of
Decades
Resolution
(Ω)
HARS-X-1-0.001
0.01
1
0.001
HARS-X-5-0.001
111.11
5
0.001
HARS-X-1-0.01
0.1
1
0.01
HARS-X-5-0.01
1.1111 k
5
0.01
HARS-X-1-0.1
1
1
0.1
HARS-X-5-0.1
11.111 k
5
0.1
HARS-X-1-1
10
1
1
HARS-X-5-1
111.11 k
5
1
HARS-X-1-10
100
1
10
HARS-X-5-10
1.1111 M
5
10
HARS-X-1-100
1 k
1
100
HARS-X-5-100
11.111 M
5
100
HARS-X-1-1K
10 k
1
1 k
HARS-X-5-1K
111.11 M
5
1 k
HARS-X-1-10K
100 k
1
10 k
HARS-X-6-0.001
1.11111 k
6
0.001
HARS-X-1-100K
1 M
1
100 k
HARS-X-6-0.01
11.1111 k
6
0.01
HARS-X-1-1M
10 M
1
1 M
HARS-X-6-0.1
111.111 k
6
0.1
HARS-X-1-10M
100 M
1
10 M
HARS-X-6-1
1.11111 M
6
1
HARS-X-2-0.001
0.11
2
0.001
HARS-X-6-10
11.1111 M
6
10
HARS-X-2-0.01
1.1
2
0.01
HARS-X-6-100
111.111 M
6
100
HARS-X-2-0.1
11
2
0.1
HARS-X-7-0.001
11.11111 k
7
0.001
HARS-X-2-1
110
2
1
HARS-X-7-0.01
111.1111 k
7
0.01
HARS-X-2-10
1.1 k
2
10
HARS-X-7-0.1
1.111111 M
7
0.1
HARS-X-2-100
11 k
2
100
HARS-X-7-1
11.11111 M
7
1
HARS-X-2-1K
110 k
2
1 k
HARS-X-7-10
111.1111 M
7
10
HARS-X-2-10K
1.1 M
2
10 k
HARS-X-8-0.001
111.11111 k
8
0.001
HARS-X-2-100K
11 M
2
100 k
HARS-X-8-0.01
1.1111111 M
8
0.01
HARS-X-2-1M
110 M
2
1 M
HARS-X-8-0.1
11.111111 M
8
0.1
HARS-X-3-0.001
1.11
3
0.001
HARS-X-8-1
111.11111 M
8
1
HARS-X-3-0.01
11.1
3
0.01
HARS-X-9-0.001
1.11111111 M
9
0.001
HARS-X-3-0.1
111
3
0.1
HARS-X-9-0.01
11.1111111 M
9
0.01
HARS-X-3-1
1.11 k
3
1
HARS-X-9-0.1
111.111111 M
9
0.1
HARS-X-3-10
11.1 k
3
10
HARS-X-10-0.001
11.11111111 M
10
0.001
HARS-X-3-100
111 k
3
100
HARS-X-10-0.01
111.1111111 M
10
0.01
HARS-X-3-1K
1.11 M
3
1 k
HARS-X-11-0.001
111.11111111 M
11
0.001
HARS-X-3-10K
11.1 M
3
10 k
HARS-X-3-100K
111 M
3
100 k
* For less exacting applications, more economical tolerances are available:
- use "A" for "X" in part # for 0.05% basic accuracy, in lieu of .01%
- use "Q" for "X" in part # for 0.02% basic accuracy, in lieu of .01%
- use "B" for "X" in part # for 0.1% basic accuracy, in lieu of .01%

OPTIONS
- RM Rack mountable case for standard 19" rack
- K Kelvin type 4-terminal binding posts
- RO Rear output binding posts
HARS-X-4-0.001
11.11
4
0.001
HARS-X-4-0.01
111.1
4
0.01
HARS-X-4-0.1
1.111 k
4
0.1
HARS-X-4-1
11.11 k
4
1
HARS-X-4-10
111.1 k
4
10
HARS-X-4-100
1.111 M
4
100
HARS-X-4-1K
11.11 M
4
1 k
HARS-X-4-10K
111.1 M
4
10 k


   
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