[time-nuts] Re: HP 5071A operating parameter trends

[Bob Camp]

Hi

Having spent a lot of time “watching” a 5071A …..

The status stuff is great and it does tell you a lot. Unfortunately, it does not really
tell you / alarm on everything that could possibly be wrong or go wrong. Our 
experience was that you really need to track it against something else (at least
from time to time) to be sure all is well. 

One example: 

As the tube wears out, the short term stability degrades. At some point it may it 
will go  past the spec limits. Typically it can do this without any obvious change 
in the status ( and no alarms ….). 

Beam current will give you some idea of what’s going on, but how much is “enough”
for this or that level of performance? Not at all clear. Still, it’s probably the one thing
I’d log on some sort of regular basis. 

Bob

> On May 13, 2023, at 10:42 AM, Stan via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I have been running my "new" 5071A for the past couple of days. I've been
> watching the output of the status message and captured a few of them below.
> The first capture was immediately after the 5071A locked after coming out of
> standby. 
> 
> 
> 
> Has anyone else been doing this? Are there particular trends I should be
> aware of that might indicate the beginnings a problem? So far, my 5071A is
> operating perfectly, with no errors on the log file.
> 
> 
> 
> Thanks,
> 
> Stan
> 
> 
> 
> MJD 131 23:56:19
> 
> CBT ID: 3839A00612(S)
> 
> Status summary: Operating normally
> 
> Power source: AC
> 
> Log status: 6 entries
> 
> 
> 
> Freq Offset:         0e-15                   Osc. control:     -3.43 %
> 
> RF amplitude 1:    22.7 %               RF amplitude 2:     22.6 %
> 
> Zeeman Freq:     39949 Hz            C-field curr:     12.218 mA
> 
> E-multiplier:     1565 V                    Signal Gain:     14.4 %
> 
> 
> 
> CBT Oven:         8.9 V                       CBT Oven Err:     0.45 C
> 
> Osc. Oven:       -8.8 V                       Ion Pump:           0.6 uA
> 
> HW Ionizer:       1.0 V                      Mass spec:       10.5 V
> 
> SAW Tuning:     0.0 V                       DRO Tuning:     5.6 V
> 
> 87MHz PLL:     1.2 V                         uP Clock PLL:     2.6 V
> 
> +12V supply:     12.3 V                    -12V supply:     -12.1 V
> 
> 5V supply:        5.3 V                        Thermometer:     42.2 C
> 
> 
> 
> ____________________________________________________
> 
> 
> 
> MJD      133 03:59:20
> 
> CBT ID: 3839A00612(S)
> 
> Status summary: Operating normally
> 
> Power source: AC
> 
> Log status: 6   entries
> 
> 
> 
> Freq Offset:          0e-15                  Osc. control:     -4.05 %
> 
> RF amplitude 1:    22.8 %               RF amplitude 2:    22.2 %
> 
> Zeeman Freq:      39949 Hz           C-field curr:    12.218 mA
> 
> E-multiplier:      1569 V                  Signal Gain:       14.4 %
> 
> 
> 
> CBT Oven:           6.6 V                     CBT Oven Err:     -0.02 C
> 
> Osc. Oven:         -8.9 V                      Ion Pump:           0.2 uA
> 
> HW Ionizer:         1.0 V                    Mass spec:         10.4 V
> 
> SAW Tuning:         0.0 V                   DRO Tuning:         5.6 V
> 
> 87MHz PLL:          1.2 V                   uP Clock PLL:       2.5 V
> 
> +12V supply:       12.3 V                  -12V supply:      -12.2 V
> 
> +5V  supply:        5.3 V                    Thermometer:       43.4 C
> 
> 
> 
> ____________________________________________________
> 
> 
> 
> MJD      133 13:09:58
> 
> CBT ID: 3839A00612(S)
> 
> Status summary: Operating normally
> 
> Power source: AC
> 
> Log status: 6   entries
> 
> 
> 
> Freq Offset:          0e-15                  Osc. control:     -4.19 %
> 
> RF amplitude 1:    22.9 %               RF amplitude 2:    22.2 %
> 
> Zeeman Freq:      39949 Hz           C-field curr:    12.218 mA
> 
> E-multiplier:      1562 V                  Signal Gain:       14.4 %
> 
> 
> 
> CBT Oven:           6.5 V                      CBT Oven Err:     -0.02 C
> 
> Osc. Oven:         -8.9 V                     Ion Pump:           0.2 uA
> 
> HW Ionizer:         1.0 V                    Mass spec:         10.4 V
> 
> SAW Tuning:         0.0 V                  DRO Tuning:         5.6 V
> 
> 87MHz PLL:          1.2 V                   uP Clock PLL:       2.5 V
> 
> +12V supply:       12.3 V                  -12V supply:      -12.2 V
> 
> +5V  supply:        5.3 V                    Thermometer:       42.8 C
> 
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