742A Resistance Standards

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Highlights

High accuracy working standards for on-site resistance calibration

  • Small and rugged resistance calibrators 
  • No oil or air baths required
  • 18° to 28° C operating range
  • Six-month stability to 2.5 ppm
  • Supplied with temperature characterization

742A Resistance Standards are high accuracy working standards for precision, on-site resistance calibration. Their excellent temperature stability allows them to be used from 18°C to 28°C with typically less than 2 ppm degradation. Using the calibration table supplied with the standards, which lists corrections in 0.5°C increments, this uncertainty can be reduced to near zero. No cumbersome oil or air baths are required.

Because 742A Resistance Standards are small and rugged, they are easy to transport. Care has been taken to reduce resistance changes brought about by thermal and mechanical shock. Retrace (permanent shift in resistance) is typically less than 2 ppm after cycling between 0°C and 40°C.

The 742A-1 1 Ω and the 742A-10k 10 kΩ units are ideally suited for Artifact Calibration of 5700A/5720A Calibrators. The other values can be used to verify the calibration if you desire.

A convenient transit case, designed to hold two standards, is available as an option.

Specifications

General Specifications
12 Values from 1Ω to 19 MΩ in x1 and x1.9 Best 1 Year Specification  :  ±4 ppm
Operating Temperature 18-28°C
Storage Temperature 0-40°C
Retrace Error (hysteresis) 23°C-18°C-23°C cycle  :  Negligible resistance shift
23°C-28°C-23°C cycle  :  Negligible resistance shift
23°C-0°C-23°C cycle  :  < 2 ppm resistance shift
23°C-40°C-23°C cycle  :  < 2 ppm resistance shift
Calibration Documentation 17025 accredited report of calibration included
Size 8.6 cm H x 10.5 cm W x 12.7 cm D (3.4 in H x 4.15 in W x 5 in D)
Weight .68 kg to .91 kg (1.5 lbs. to 2 lbs.) depending on the model

Models and Accessories

Model Name Description
742A-1 1 Ω Resistance Standard
742A-1.9 1.9 Ω Resistance Standard
742A-10 10 Ω Resistance Standard
742A-25 25 Ω Resistance Standard
742A-100 100 Ω Resistance Standard
742A-1k 1 kΩ Resistance Standard
742A-10k 10 kΩ Resistance Standard
742A-19k 19 kΩ Resistance Standard
742A-100k 100 kΩ Resistance Standard
742A-1M 1MΩ Resistance Standard
742A-10M 10 MΩ Resistance Standard
742A-19M 19 MΩ Resistance Standard

Accessories common to all models  :  

Accessory Description
5440A-7002 Low Thermal Test Leads
5440A-7003 Low Thermal Copper EMF Plug-In Cables, Spade Connectors
742A-7002 Transit Case (holds 2 units)

Knowledge and Information

Product Manuals
application/pdf icon 742A Instruction Manual (495.67 KB)
application/pdf icon 742A Instruction Manual Supplement (57.2 KB)
application/pdf icon 742A Statement of Memory Volatility (16.22 KB)
Data Sheets
application/pdf icon 742A Four-Terminal Resistance Standards Data Sheet (255.27 KB)