Boy is that the fact. Gotten me a time or 2. Regards Paul WB8TSL
On Fri, Nov 7, 2014 at 9:13 AM, J. L. Trantham <[email protected]> wrote: > Forgot to mention to be sure and check the front panel bulbs. Frequently > they burn out and you get no indication when everything is OK. > > Good luck. > > Joe > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of J. L. > Trantham > Sent: Thursday, November 06, 2014 8:19 PM > To: 'Discussion of precise time and frequency measurement' > Subject: [Bulk] Re: [time-nuts] [Bulk] Re: New Guy, has HP 5061A with > DATUM 7105A tube seeks advice > > Wayne, > > Forgot to mention this on my first post. > > On the front panel: > > 1. Set the MODE to 'CS OFF' > 2. Set OSC FREQUENCY five turn pot to '250' (not COARSE). > 3. Set MOD to 'ON'. > 4. Set C FIELD to whatever the front door says it should be. > 5. Set CIRCUIT CHECK to 'ION PUMP I'. > > Plug it in and wait. ION PUMP I will likely (should) go full scale. Only > once it comes close to zero will you be able to advance further. > > You can, however, switch CIRCUIT CHECK to its various positions and see > what the readings are. > > BATTERY will not indicate since you removed the battery and charger card. > > SUPPLY will indicate about 3/4 scale or a bit more to indicate that the > 18.7 VDC is OK. > > ION PUMP I will likely be 'full scale' but, in my experience, the Datum > tubes will pump down faster than the HP tubes. At least give it a couple > of days. > > OSC OVEN will start full scale but will fall to about 3/4 scale as the > 10811 heats up and comes to its operating temperature. If it does not come > down in about 30 to 60 minutes, there is likely a problem with the 10811. > > CS OVEN will be at zero until you turn MODE clockwise past CS OFF. It > will then go full scale and after 30 to 60 minutes will indicate similar to > OSC OVEN, assuming everything is OK. > > 5 MHZ should be about 2/3 scale. > > MULT will not indicate until you flip the AUTO START - START switch to > START and then let it go back, IIRC. > > BEAM I and 2nd HARMONIC will not indicate until you are past CS OFF on the > MODE switch and the CS OVEN indication comes back down 'on scale'. > > CONTROL will indicate when you are in OPER on the MODE switch and have hit > the LOGIC RESET button once everything is 'on scale', assuming your OSC > FREQUENCY COARSE is 'in the ball park'. Once you have had the unit plugged > in and the OSC OVEN indication has 'come down', you can check the 5 MHz > against your GPSDO and then adjust the OSC FREQUENCY COARSE to bring it to > 5.000000 MHz. Once there, the PLL will likely be able to 'lock' and the > CONTINOUS OPERATION light should turn green after moving MODE to OPER and > hitting the LOGIC RESET button but only after all the other meter > indications are correct. If the light turns green, it is time for the > 'happy dance'. > > 1 MHz and 100 kHz will indicate after flipping the START switch. > > Hope this helps. > > Good luck. > > Joe > > > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of Wayne > Holder > Sent: Thursday, November 06, 2014 7:14 PM > To: Discussion of precise time and frequency measurement > Subject: [Bulk] Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A > tube seeks advice > > > If you get the tube working, you should use a counter or Lissajous > > display with a GPS or rubidium standard to preset it to the correct > > resonance peak frequency for lockup. The tube will probably be pretty > > noisy at first. If it also has weak beam current, which is common, it > > will be very difficult to find the right peak without cheating. > > > > I have a Trimble Thunderbolt GPS Disciplined Clock. Is that going to be > good enough to set the correct resonance peak frequency for lockup? > > BTW, thanks for the link to a source for a manual. I've ordered a copy > for my serial number range. > > Wayne > _______________________________________________ > 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. > > _______________________________________________ > 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.
