Le 27 sept. 2013 à 20:21, Tom Knox a écrit : > With a cesium standards cheap is truly relative since the remaining of tube > life will make of break just about any deal regardless of price.
Which is why I am asking these Qs. Cheap is indeed relative, as is time itself. > Where it is hard to pay to much for a 5071A with a fresh tube. But I am > curious also what others would consider cheap. > > Thomas Knox > > > >> Date: Fri, 27 Sep 2013 12:52:25 -0400 >> From: [email protected] >> To: [email protected] >> Subject: Re: [time-nuts] CBT designation and usage? >> >> Cheap is relative. Curious what it means? >> Paul >> WB8TSL >> >> >> On Fri, Sep 27, 2013 at 12:20 PM, mc235960 <[email protected]> wrote: >> >>> Hi, >>> Some Qs for someone with 5071A experience. >>> >>> I have picked up a cheapo second hand 5071A and would like to know what >>> tube I have and what remaining life I might expect. >>> It locked in about 10-15 mins after I applied power for the first time >>> this morning. >>> >>> the box s/n is 3249A00498 and the tube s/n 3124A00248 has an (S) suffix . >>> There is an opt 001 (high performance CBT) label on the box. >>> >>> *idn? returns HEWLETT-PACKARD,5071A,0,X.3249 The Symmetricom manual of >>> 2006 give a "SYMMETRICOM" string returned. So it must be quite old I >>> guess. >>> >>> X.3429 appears to correspond to the firmware version as seen on the LCD . >>> >>> Given that, does anyone know how to find out >>> >>> a) date of manufacture >>> b) type of CBT >>> >>> I could not find any command sequence to indicate usage, so is there a >>> way to find out >>> >>> c) The cumulated CBT power on time? >>> >>> d) If that is not available, is there anything in Status summary that >>> could give a clue to aging? >>> >>> scpi> syst:print? >>> >>> MJD 56562 15:20:21 >>> CBT ID: 3124A00248(S) >>> Status summary: Operating normally >>> Power source: AC >>> Log status: 15 entries >>> >>> Freq Offset: 0e-15 Osc. control: -5.57 % >>> RF amplitude 1: 35.5 % RF amplitude 2: 33.4 % >>> Zeeman Freq: 39949 Hz C-field curr: 12.157 mA >>> E-multiplier: 1357 V Signal Gain: 14.4 % >>> >>> CBT Oven: 6.1 V CBT Oven Err: 0.02 C >>> Osc. Oven: -9.0 V Ion Pump: 0.2 uA >>> HW Ionizer: 1.1 V Mass spec: 11.0 V >>> SAW Tuning: 1.9 V DRO Tuning: 5.7 V >>> 87MHz PLL: 1.1 V uP Clock PLL: 2.7 V >>> +12V supply: 12.4 V -12V supply: -12.3 V >>> +5V supply: 5.5 V Thermometer: 42.3 C >>> >>> Regards, >>> Mike >>> >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> 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.
