Tracor 527E

The all-silicon, solid-state 527E Frequency Difference Meter is designed for instant determination of the fractional frequency difference, with an accuracy of one part in 10E+11, between two stable oscillators. It accepts input signals with nominal frequencies of 100kHz, 1MHz, 2.5MHz, and 5MHz. No switching is required when the input frequencies are changed, and the two input frequencies need not be the same.