Mamdouh M. Halawa
Electrical Metrology Department, National Institute for Standards (NIS)
Tersa St., Giza, El-Ahram, Box: 136, Code: 12211, Egypt
This paper gives a brief summary of the ac-dc difference calibration service for thermal
transfer standards at the National Institute for Standards (NIS), Egypt. Related subjects
discussed include automated calibration system, bi-lateral intercomparison (with NPL,
England), the efficiency test, a new current shunt for thermal current converters and research
into thermal transfer standard.