[time-nuts] CBT designation and usage?

[mc235960]

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: 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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