Electronic counting frequency meters '' Ch3-68 '' and '' Ch3-69 ''.

Instruments for adjusting and controlling the PTA.Electronic counting frequency meters "Ch3-68" and "Ch3-69" have been produced since 1989 by the Abovyan plant "Izmeritel". Frequency meters are designed to measure sinusoidal and pulse frequencies and provide a reference frequency signal. More details about the devices in the instruction manual.