[time-nuts] CBT designation and usage?

[paul swed]

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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>
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