Re: [time-nuts] HP 5335a opt 40 addendum
Dear Norm, Norman J McSweyn wrote: Magnus, Thanks for the enlightenment! I modified the driver that NI has on their site. Works. Have been manually setting the trigger levels on the front panel. Now know how to use the -40 to do it. Great! Happy to help! I'll further modify the driver in the AM. The manual I have doesn't have programming example 13. I haven't looked in detail, but I *think* the HP5335A manual on the HP site is the same as I have, and then you should have all the details you need. I take it that the instrument will trigger automatically when the conditions are met? Indeed it does. I'm comparing the 1pps output from an M12+t to the divided down 10MHz out from a Thunderbolt. Next hurdle is to do something with the collected data. Way to go! You should learn to calculate Allan deviation and friends. Not to hard. You should learn to estimate drift rate and subtract that from measurements, since that is often ignored and the drift rate will form a lower floor for longer measurement runs. This is an error which is either canceled by locking or by software. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 5335a opt 40 addendum
Magnus Danielson wrote: Dear Norm, Norman J McSweyn wrote: Magnus, Thanks for the enlightenment! I modified the driver that NI has on their site. Works. Have been manually setting the trigger levels on the front panel. Now know how to use the -40 to do it. Great! Happy to help! I'll further modify the driver in the AM. The manual I have doesn't have programming example 13. I haven't looked in detail, but I *think* the HP5335A manual on the HP site is the same as I have, and then you should have all the details you need. Magnus, Unfortunatly, the manual on Agilent's site is the one that I have, without the -40 addendum. I take it that the instrument will trigger automatically when the conditions are met? Indeed it does. I'm comparing the 1pps output from an M12+t to the divided down 10MHz out from a Thunderbolt. Next hurdle is to do something with the collected data. Way to go! You should learn to calculate Allan deviation and friends. Not to hard. You should learn to estimate drift rate and subtract that from measurements, since that is often ignored and the drift rate will form a lower floor for longer measurement runs. This is an error which is either canceled by locking or by software. Data is time stamped and in a text file. One file is the TI data from the 5335a, the other is part of the @@Hn (with the sawtooth correction) message from the M12+T. In the interest of ensuring that I have a useful data set, I need to find a way to use Excel to check that no seconds have been skipped. Then post process the TI measurement to reflect the 1pps sawtooth. The next steps are a mystery. I drive locomotives for a living. This is a hobby!! Have been playing with math for a while now, so it's not a black art! Didier has a few pages on measurements and one with tvb's explanation of Allan deviation. This will be today's reading!!! Translating this into an Excel spreadsheet is the next hurdle. Comparing the two devices (Thunderbolt to M12+T) is rather banal. It's like comparing two types of apples together. Not much difference. However, it's a steep learning curve to get to this point. Any pointers are welcome! Thanks, Norm n3ykf Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 5335a opt 40 addendum
Norman J McSweyn wrote: Hi all! I'm having some trouble programming my 5335a. The manual that Agilent has doesn't cover opt 40. Have psyched out several of the codes that aren't in the manual. Using Labview 8, string that is sent is this: in,az1,bz1,ap0,bp0,fn2,trg (initialize) (chA impedance 50 ohms) (chB ) (chA preset off) (chB) (time interval) (trigger measurement) CHANNEL A AND B IMPEDANCE COMMANDS ARE GUESSES They are correct. You do not say anything on trigger levels and other 040 settings thought. The programming example 13 indicates that you should do something like this: in,fu2,co1,bs1,tr1,at+2.71,bt+3.14 This becomes in - Initialize fu2 - Time Interval co1 - Set COMA on bs1 - Set SLOPE B to NEGATIVE tr1 - Set TRIGGER LEVELS to REMOTE at+2,71 - Set TRIGGER LEVEL A to +2,71 V bt+3.14 - Set TRIGGER LEVEL B to +3,14 V The programming example does not use the trg command! The result is a hang with no measurement. If I forgo the impedance settings via gbib (doing it manually), I will get an error (front panel 1.0). Manual says this is an invalid HPIB alpha command sent. I will get a measurement. It takes 1.5 sec or so. I'm on vacation for the next two weeks. This am will be busy. Will be free 16Z give or take. I hope the above hints helps. I haven't tested them against my HP5335A (with option 040) but I could do the effort if you need additional assistance. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
