[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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