Frequency Meters
Most components in a power system are designed to run on a specific ac frequency or limited range of frequencies. The frequency meter is important to test these frequencies. The frequency meter works very much like the digital voltmeter. A digital meter can generate a pulse train to be counted. Since the test frequency already has waveforms that can be counted, the clock and decade divider circuits only have to supply the gate pulse. The test signal is amplified, then converted to square wave pulses, generally by a Schmill trigger stage. The pulses are gated, then further shaped, and then counted to determine their frequency for display.
