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 Ohm and the 742A-10k 10 kOhm 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.