For a long time I wanted to calibrate the Hameg 8021-2 to my external 10MHz GPSDO. But, unfortunately, the crystal oven is not very stable. My thought was, why calibrate if you can use the back BNC connector to feed the external 10MHz signal from the GPSDO? So, this was an easy task. Find the internal 10MHz, disconnect it, connect to rear via 1nF capacitor. Done ;)
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