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Home Test and Measurements HARS-LX SERIES DECADE RESISTANCE SUBSTITUTER LAB STANDARD
OS-260 & OS-270 RESISTANCE DECADE BOXES / RTD SIMULATOR
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HPRS SERIES HIGH POWER RESISTANCE DECADE BOX
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IET Labs, Inc

HARS-LX SERIES DECADE RESISTANCE SUBSTITUTER LAB STANDARD

Brand

IET Labs, Inc

Sub Categories

Lab tools

Application

Resistance Decade Box

Category: Test and Measurements
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  • GENERAL
  • DESCRIPTION
  • SPECIFICATION
  • DATASHEET AND MANUAL
  • ACCESSORIES
GENERAL

GENERAL

  • High accuracy – as good as 20 ppm
  • High stability – as good as 5 ppm/yr
  • Over 55 models available with resistance from 1 mΩ to 121.1 MΩ
  • Resolution as good 1 mΩ with a fixed decade or 20 μΩ with a rheostat.
  • Low temperature coefficient – as low as 3 ppm/°C
  • High performance silver-clad contacts
  • Hermetically sealed, low inductance resistors
  • No zero correction required
  • For increased accuracy, decades ≥ 1 Ω can be individually trimmed
  • The US Army’s Resistance Standard

DESCRIPTION

DESCRIPTION

The HARS-LX series is the world’s highest accuracy continuously variable decade resistor for the most exacting calibration and test applications.

The HARS-LX substituter is a precision resistance source with excellent characteristics of accuracy, stability, temperature coefficient, and power coefficient. All these features serve to make it a laboratory resistance standard, exceeded in performance only by stand-alone standard resistors.

Hermetically sealed wirewound resistors are used for 1 Ω steps and over. These resistors are carefully conditioned under power and temperature in order to develop the best stability characteristics. Actual experience has shown them to exhibit a storage stability of better than 5 ppm/year, improving as they age. The low-resistance resistors are constructed with resistance wire with a minimum of copper resistance in series to limit temperature coefficient effects.

The resistance substituter has a fixed minimum resistance of 10 mΩ. This is implemented by mechanically limiting the 10 mΩ decade from going below the “1” position. In this manner, no zero resistance subtractions have to be made, and the accuracy given is for the absolute reading.

The HARS-LX series employs completely enclosed dust-tight very low contact resistance switches. They feature silver-clad copper contacts and quadruple-leaf silver alloy self-cleaning wipers which keep switch contact resistance to under 1 mΩ per decade, and more importantly, keep switch contact resistance reproducible, insuring repeatable instrument performance.

High quality gold plated tellurium copper binding posts minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements. All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that contribute to thermal emf problems.

The HARS-LX is designed to allow very convenient maintenance of calibration over time. Most decades can be calibrated without changing components or soldering resistors. The decades for the 100 Ω through 100 kΩ steps are calibrated with convenient trimmers. Trimming of the lower decades is also possible.

With a resolution as low as 1 mΩ and a maximum available resistance of over 12.2 MΩ, the HARS-LX Series may be employed for exacting precision measurement applications requiring high accuracy and stability. They can be used as components of dc and low frequency ac bridges, for calibration, as transfer standards, and as RTD simulators

SPECIFICATION

SPECIFICATION

HARS-LX BASIC SPECIFICATIONS

(Full specifications can be found on the datasheet)

Resistance per step
Total decade resistance
Max current
Max power
Temperature coefficient (ppm/ºC)
Power coefficient (ppm/mW)
Accuracy
Stability(±}ppm/yr
100μΩ Rheostat
10 mΩ
2 A
NA
20
1
1 mΩ
10 mΩ
2 A
NA
20
1
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
10 mΩ
100 mΩ
2 A
NA
20
1
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
100 mΩ
1 Ω
2 A
NA
20
1
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
1 Ω
10 Ω
1 A
5 W
20
0.4
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
10 Ω
100 Ω
0.33 A
5 W
10
0.3
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
100 Ω
1 kΩ
0.1 A
5 W
3
0.1
20 ppm+0.5 mΩ
20 ppm+0.5 mΩ
1 kΩ
10 kΩ
33 mA
5 W
3
0.1
20 ppm+0.5 mΩ
10 ppm(<5 ppm typical)
10 kΩ
100 kΩ
10 mA
5 W
3
0.1
20 ppm+0.5 mΩ
10 ppm(<5 ppm typical)
100 kΩ
1 MΩ
3 mA
2,000 V
3
0.1
20 ppm+0.5 mΩ
10 ppm(<5 ppm typical)
1 MΩ
10 MΩ
1 mA
2,000 V peak
3
0.1
20 ppm+0.5 mΩ
10 ppm(<5 ppm typical)
10 MΩ
100 MΩ
2,000 V peak
15
0.2
2000 ppm
50 ppm
Wiring and switch resistance
50μΩ/C 0.2μΩ/W

At 23°C “true ohm” measurement, 30-70% RH, absolute reading, SI traceable
No zero subtraction required
Minimum resistance:10 mΩ ± 0.5 mΩ; determined by the lowest settable position, “1”, of the 10 mΩ/step decade
Resistance repeatability: Better than 100 μΩ, short-term, average value

DATASHEET AND MANUAL

DATASHEET AND MANUAL

  • Data Sheet: This document explains the features, options, Specifications and option models for this item.
  • Product Manual: Specifications and option models for this item. This document contains the technical product manual and guidelines.
ACCESSORIES

ACCESSORIES

  1. ISO-17025 Accredited Calibration with Test Data

    ISO-17025 ACCREDITED CALIBRATION WITH TEST DATA

Handles

HANDLES
NIST Traceable Calibration Cert (Included)

NIST TRACEABLE CALIBRATION CERT (INCLUDED)

HARS-X-K

KELVIN TYPE 4-TERMINAL BINDING POST

TL-500 ULTRA HIGH PERFORMANCE BANANA CABLES

TL-500 ULTRA HIGH PERFORMANCE BANANA CABLES

TL-600 Spade Lug Cable

TL-600 PERFORMANCE SPADE LUG CABLES

10 milliohm Rheostat

10 MILLIOHM RHEOSTAT FOR LOWEST DECADE, 20 MICROOHM RESOLUTION

 

Rackmount Kit

RACKMOUNT KIT

 

Rear Output with -K Kelvin Connection

REAR OUTPUT BINDING POSTS

 

Testing Leads Set

TLK-100 DELUXE SET OF TESTING LEADS (17 PCS)

 

 

 

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