RV30-20K/RV30YN20SB203 RV-3028-C7 32.768kHz 1ppm TA QA RV-3028-C7 32.768kHz 1ppm TA QC RV-3028-C7 32.768KHZ 1PPM-TA-QA RV-3028-C7 32.768KHZ 1PPM-TA-QC RV-3028-C7 ON BOARD 32.768kHz TA QC RV-3028-C7-32.768KHZ-1PPM-TA-QC RV-3028-C7-EVALUATION-BOARD RV-3028-C7TAQA RV-3028-C7TAQC