TY - GEN AU - Chang, Y May AU - Tillett, Summerfield B C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1998-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.250-47 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1998 TI - NIST calibration service for capacitance standards at low frequencies: ER -