[time-nuts] CBT designation and usage?

paul swed paulswedb at gmail.com
Fri Sep 27 12:54:06 EDT 2013


Beam current would be important to get an idea on life.
Curious does the 71 display that??
Regards
Paul
WB8TSL


On Fri, Sep 27, 2013 at 12:52 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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