Electronics > Beginners
Using Freq. Counter of FY6800
vinlove:
I have a FY6800, and was trying to use its Counter function to measure RF Frequency oscillated by an external signal generator (actually a Heathkit GD-1U Dip meter).
I connected a probe to Counter BNC connector of the FY6800, and the GD-1U was switched on with 1.7Mhz - 4Mhz coil plugged in.
I was under impression that when I rotate tuning dial of the GD-1U, FY6800 set to Freq. of the Counter mode would read out the frequency generated by the GD-1U. But there was no reading at all. Just 0.0Mhz.
Why could this be? Couldn't FY6800 counter BNC connector pickup the frequency generated by GD-1U by touching the coil of the GD-1U with the probe connected to the FY6800 BNC conector of the counter?
Does it need direct connection and fed with more voltages from the probe?
Loose coupling doesn't work? Or am I doing something wrong here?
The RIGOL DS1052E was reading the generated freq from the GD-1U by loose coupling no problem.
ArthurDent:
Have you checked to see if the level is within the range of the FY6800? the manual says: "Amplitude of signal inputted should be bigger than 1.5V. Maximum safe voltage inputted from Input and Trig IN is 5V." Most dedicated counters can read signals down to the millivolt range.
vinlove:
--- Quote from: ArthurDent on July 29, 2019, 01:08:44 am ---Have you checked to see if the level is within the range of the FY6800? the manual says: "Amplitude of signal inputted should be bigger than 1.5V. Maximum safe voltage inputted from Input and Trig IN is 5V." Most dedicated counters can read signals down to the millivolt range.
--- End quote ---
No, I have not read the manual. If its needing input voltage bigger than 1.5V, then it is natural that it doesn't read the freq from GD-1U. Because with loose coupling voltage read by the Rigol 1052E was about 10mV.
FeelElec:
Dear Customers,
The instrument counter function, in the DC-coupled state, the signal to be measured is input from the Trig IN terminal of the back panel. The signal to be measured is input from the INPUT terminal of the front panel in the AC-coupled state, and the measured signal amplitude needs to be greater than 1V.
FeelElec
vinlove:
I measured signal generated from a DMM 1Khz and 1V, connected using a DSO probe to the DMM, and FY6800's Counter BNC connector. THe FY6800 was reading freq. 1Khz OK.
If the voltage is less than 1V, it will not read.
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