Electronics > Beginners
Using Freq. Counter of FY6800
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vinlove:
Would DSOs be  good tool to measure Freq. from RF sources such as HF transmitters?
My DSO is Rigol DS1052E. 
ArthurDent:

--- Quote from: HB9EVI on July 30, 2019, 12:44:29 pm ---how should that work? inductive coupling can be used if the input of the counter is sensitive enough, but that's not the case in many of those function generators with frequency counter functionality - somewhere the manufacturer is going to save and that most likely on such addons. Also I doubt long- and short term stability of the reference clock of this device to be really usable for a counter.
--- End quote ---

Actually the stability and accuracy of the included 50Mhz oscillator is barely adequate for a function generator, let alone a frequency counter. That is why on my older FY6600 I not only replaced the crappy power supply with a high quality SMPS, I replaced the 50Mhz oscillator with a 5X PPL chip, and the oscillator with a high stability 10Mhz OCXO and included a switch to also use an external 10Mhz source like from one of my GPSDOs if I wanted even higher resolution and accuracy. The details for these changes are in the FY6600 thread if you're interested.

For a counter my modified FY6600 works quite well as you can see in the attached photo where the FY6600 is using the internal 10Mhz OXCO and counting one of my GPSDOs with a 10S sample time. It still has the limitation of needing a higher level to count but I have other high end counters for that purpose. When using the FY6600 as a function generator I can get about 12 digits of stable frequency.
vinlove:
When my FY6800's probe was touching the signal source physically, it reads frequency accurately.  I was comparing it with all other freq measuring devices from the same signal source.

It is just when I am trying to read freq by inductive way (not physically touching, but bringing the sig source very near to the input socket of FY6800, then it does not read.
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