TY - GEN AU - Kinard, J R AU - Hastings, J R AU - Lipe, T E AU - Childers, C B C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1989-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.250-27 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1989 TI - AC-DC difference calibrations: ER -