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TDC1000-TDC7200EVM: TDC1000-TDC7200 EVM Concentration Measurement TOF AVG value changing

Part Number: TDC1000-TDC7200EVM

Hello. I want to ask a question. I m using TDC1000-TDC7200 EVM for concentration measurement. And TOF AVG value is changing 1ns for each 1000 Sample.  And my AVG/STDEV NUM_ELEMENTS(>0) value is 100, TRIGGER UPDATE FREQUENCY is 200 milisecond and TDC_Select is START-STOP123. This 1ns rising is normal ? or the starting TOF value can change only +/- 1ns in for during whole running time ? . Thanks.