Advanced Qualification · A-003 Measurements · A-003-004-005
Si la précision de la base de temps d'un fréquencemètre est de 10 PPM (parties par million), quel écart maximal peut donner la lecture d'une fréquence de 146 520 000 Hz?
- A146,52 kHz
- B1465,2 kHz
- C1465,2 Hz
- D146,52 Hz
Correct answer: C — 1465,2 Hz. Question tirée de la banque officielle d'ISDE.
Why
A time base accuracy of 10 parts per million means the reading can be off by 10 Hz for every million Hz measured. The full explanation — and one for every question — is in Pro.
Practise this section
Measurements is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.
Drill A-003 — free, no account