The paper evaluates the measurement uncertainty in realizing the secondary vibration standard at CSIR-National Physical Laboratory, India, and presents a comparison of the measurement uncertainty of secondary standard with that of primary vibration standard. The relative expanded measurement uncertainty of 0.80% to 2.2% in frequency range of 5 Hz to 10 kHz is evaluated. The measurement uncertainty so calculated is verified by comparison with the results from primary vibration calibration standard of CSIR-National Physical Laboratory, New Delhi, and SPEKTRA Schwingungstechnik und Akustik GmbH Dresden, Germany primary calibrations. The study recommends calibrating the back-to-back accelerometer with minimal uncertainty by using a primary calibrated single-ended accelerometer mounted on the top of the back-to-back transducer.The paper serves a guiding document to the calibration laboratories, industries and other stake holders in India to understand the concept of traceability in vibration measurements and formulation of uncertainty budget as per the international standard. 

本文评估了印度CSIR国家物理实验室在实现次级振动标准时的测量不确定度，并比较了次级标准和初级振动标准的测量不确定度。在5 Hz至10 kHz的频率范围内评估了0.80％至2.2％的相对扩展测量不确定度。通过与新德里CSIR国家物理实验室的主要振动校准标准和德国德累斯顿SPEKTRA Schwingungstechnik und Akustik GmbH的主要振动校准标准的结果进行比较，可以验证所计算出的测量不确定度。该研究建议通过使用安装在背对背换能器顶部的主校准单端加速度计，以最小的不确定度校准背对背加速度计。