While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

• A.  2 Mhz
• B.  1 Khz
• C.  8 Mhz
• D.  2 Khz

Answer: (A)