Take care that the 'scope is not a 50 ohm load: the TDS2024B has not the 50ohm/1Mohm input selection. So far I wasn't able to get from the 'scope FFT the same measurements that I get from a spectrum analyzer.
On Wed, Sep 28, 2016 at 7:38 AM, Tim Lister <[email protected]> wrote: > On Tue, Sep 20, 2016 at 12:56 PM, Bryan _ <[email protected]> wrote: >> May also want to check the output amplitude. If memory serves me correct it >> is very common for a capacitor inside this model number to fail. It can be >> fixed but requires a torch or a pretty heavy duty soldering iron to get the >> can open. >> http://www.rbarrios.com/projects/MV89A/ >> >> -=Bryan=- >> > > I managed to borrow a Tek TDS 2024B 200 MHz scope from work and hooked > it up to the output of my MV89A. I get a peak-to-peak measurement of > 2.3 V which if I have converted it right is ~11 dBm ? Alternatively if > I turn on the FFT mode on the scope I get a peak value of -2.17 db if > I am driving the cursor mode correctly. With the 10 MHz from the > radioshackus GPSDO used for triggering, it takes ~18 seconds for the > MV89 waveform to drift 1 cycle (this is without anything connected on > the Uin or Uref pins). > > Tim > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
