Mal wieder etwas aufgeschraubt, diesmal ein Hameg 8021-4 Frequenzzähler, mit einem TCXO 10MHz Oszillator.
Continue reading “Drin im Hameg 8021-4 Frequenzzähler”Tag: counter
Drin im alten Frequenzzähler
Habe mal bei Ebay-Kleinanzeigen einen alten, vermutlich selbstgebauten, Frequenzzähler mit Nixie-Röhren ergattert. Dieser funktioniert erstaunlich gut, und auch seine Timebase ist ziemlich genau.
Continue reading “Drin im alten Frequenzzähler”Max freq of test equipment
Many measuring devices have a maximum frequency up to which they work correctly, as stated by the manufacturer. Above that frequency they don’t just stop working, rather they still have a range above where they still may work correctly, just aren’t as sensitive. Many oscilloscopes, for example, can work up to twice their bandwidth, but the measured amplitudes are not more than some random numbers. You can still see the waveform, but not do any meaningful measurements.
Continue reading “Max freq of test equipment”Ext 10MHz for Hameg HM8021
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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