[time-nuts] CBT designation and usage?

mc235960 mc235960 at gmail.com
Fri Sep 27 12:20:47 EDT 2013


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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