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

Sat May 13 16:03:09 UTC 2023

Hi;
I do not have data for you to compare, but have worked with many 5071A's in the past, and your numbers look very good. But number do not always tell the full story, every 5071A has a little different personality, and some run fine for many years even with suspect numbers like high E-Mult voltage approaching the 2550 limit.
The thing to watch for is changes in Gain and E-Mult among other readings rather than specific numbers. Also depending on your application and level of wealth you may what to keep the 5071A in standby mode. In my lab I diciplined my ULPN clean-up oscillators with a "state of the art" GPS rec as my day to day reference and diciplined with the 5071A when needed.
Depending on your 5071A manufacture date you may also want to replace about 30 tantalum capacitors. In latter units the values were changed to address the issue. You are welcome to contact me directly for information on the suspect caps.
Most importantly enjoy you amazing frequency standard.
Cheers;
Tom Knox
SR Test and Measurement Engineer
Phoenix Research
4870 Meredith Way Apt 102
Boulder, Co 80303
303-554-0307
actast at hotmail.com

https://www.thedenverchannel.com/news/marshall-fire/superior-man-moving-forward-after-losing-dream-research-lab-during-marshall-fire

"Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein
________________________________
From: Stan via time-nuts <time-nuts at lists.febo.com>
Sent: Saturday, May 13, 2023 8:42 AM
To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
Cc: Stan <swperk at earthlink.net>
Subject: [time-nuts] HP 5071A operating parameter trends

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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