Hi You have one of the many MV89A’s with an output problem. To be absolutely sure of the output, you need to have the scope set to 50 ohm input. If it was set to Hi-Z, the output is likely even lower…..
Bob > On Sep 28, 2016, at 1:38 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.
