[time-nuts] CBT designation and usage?

[Tom Knox]

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. 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: paulswedb at gmail.com
> To: time-nuts at febo.com
> 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 <mc235960 at gmail.com> 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
> >
> >
> >
> >
> >
> >
> >
> >
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