Calculation method of 53152A frequency measurement accuracy
Calculation method of 53152A frequency measurement accuracy
Calculation method of 53152A frequency measurement accuracyTroubleshooting (FAQ)SummaryExplain how to calculate frequency measurement accuracy of 53152A?QuestionHow to calculate frequency measurement accuracy of 53152A?AnswerThe frequency accuracy of the 53152A is calculated using the equation: ±1 LSD ± residual stability ± time base error x frequency Where: LSD: is the selected resolution (1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz) Residual stability: 1.25 LSDrms for channel 2 (For the frequency accuracy calculation, residual stability is not applicable (N/A) to channel 1 when the counter and source share the same time base.) Time base error: Aging Rate + Line Variation + Temperature Stability (Time base error is a function of the reference oscillator (TCXO or OCXO – Opt. 001) within the counter. Exact line variation and temperature stability values or whether these values can be ignored is determined by a metrology laboratory and the temperature stability of the environment.) Applying this information to the equation and assuming 100 kHz measurement resolution of a 1 GHz sine wave on channel 2 and a 6 month TCXO aging rate gives: + 100E3 +( 1.25)(100E3 x .707) + ((6 x 10-7) + 10-7 + 10-6) x 1E9) = + 190.075E3 If measurements are made using channel 1 and the counter and signal source use the same time base, residual stability does not apply and the accuracy becomes +101.700E3.