For quality in measurements, you must have quality design and quality manufacturing in your standard. Examine the internal layout of theGuildline 6622A-QHR Bridge you will see the absolute quality in the entire bridge with special attention paid to insulating and use of ground planes to reduce noise, the latest in modern components to reduce affects due to temperature and power, increased resolution and stability in voltage and current, increased reliability, and faster measurement cycles. Add to this the latest and advanced designs and a carefully thought out and designed internal layout, and you will find a Bridge that will meet customer QHR requirements today, as well as years into the future.

Measurement ranges from 1µΩ to 1GΩ, with uncertainties from 0.1ppm to 0.015ppm, making the 6622A-QHR the most accurate commercially available resistance standard. With wide ranging resistance and current measurement and calibration, the 6622A quantum hall resistance DCC bridge is available as a complete turnkey package with software
Every effort has been taken in the 6622A-QHR design to reduce noise and error. Thermal EMF effects are eliminated by automatic current reversal. The unique architecture of the bridge and its control algorithm further removes gain and offset errors in the Nano-voltmeter balance detector and the precision toroid. The end results are shown by long term accuracy and linearity without the need for routine, frequent verification tests or calibrations. The 6622A-QHR incorporates unique ‘self-calibration’ functionality for the embedded null detector which is performed as part of each measurement. In addition, via the standard interchange technique, the bridge automatically performs a ‘self-calibration’ of the measurement ratios to < 0.02 x 10-6.
The Bridge provides a full 10 digits of resolution (i.e. 1 part in 1010 for all resistance values) and the ability to graphically see the data (trending). You can have the data presented in a summary or detailed format right on the Bridge Screen or available via PC Base BridgeWorks Software. Measurement and Uncertainty Analysis you need as a Metrologist or to meet the requirements of ISO 17025 Accreditation!

Please note this product is no longer available. It has been replaced with the 6640Q