HP 34420/SPRT/PRT Precision Thermometers and NanoVolt/Micro-Ohm Meter

Low-noise input amplifiers and a highly tuned input protection scheme bring reading noise down to 8 nV pp. Combine this with 7 ½ digits of resolution, selectable analog and digital filtering, 2 ppm basic 24-hour dcV accuracy, and a shielded, copper pin connector and you've got accurate, repeatable measurements you can count on.

Two input channels

An integral two-channel programmable scanner simplifies voltage comparisons. Built-in ratio and difference functions enable automated two channel measurements without the need for an external nanoVolt scanner. Both channels share the same low noise specifications to ensure accurate comparisons.

Built-in resistance and temperature

The HP 34420A combines its low-noise nanoVolt input circuits with a high-stability current source to provide precise low-level resistance measurements - no more hassling with the cost and complexity of an external current source. Three resistance modes are included:

Offset compensation is also provided to minimize thermal EMFs and associated errors.

SPRT measurements

Built-in ITS-90 conversion routines accept the calibration coefficients from your SPRT probe for direct temperature measurement and conversion. Thermocouples, Thermistors, and RTDs are also supported.

The HP 34420/SPRT comes with a Rosemount 162CE probe, the industry standard for accuracy. The HP 34420/PRT comes with a Hart Scientific 5628 probe, a more rugged solution for applications outside the lab. In both models, meter and probe are calibrated together as a system.

Unequaled versatility

The HP 34420A gives you the versatility to tackle your most challenging tasks, both on the benchtop and in your automated system. Standard features include: RS-232 and HP-IB interfaces, SCPI and Keithley 181 programming language, 1024-reading memory, scaling and statistics, and a chart recorded analog output.

Quality you can count on

The HP 34420A gives you the quality and reliability you expect from Hewlett-Packard. From the product's proven >150,000 hour Mean Time Between Failure, to its standard 3-year warranty, the HP 34420A brings you a new level of confidence in your low-level measurements.