HP 83751A User Manual page 8

Certification
Hewlett-Packard Company certihes that this product met its published
specifications at the time of shipment from the factory. Hewlett-Packard
further certifies that its calibration measurements are traceable to the United
States National Institute of Standards and Technology, to the extent allowed
by the Institute's calibration facility, and to the calibration facilities of other
International Standards Organization members.
The "Safety and Regulatory Information" chapter contains regulatory
information.