PRS10: What are good values for AD9 and DS?
Hi,
I recently received a used PRS10. The unit appears to work fine, but may
be a bit old. The serial number is 18508, which is lower than many of
the others I've seen. Additionally, running FC!? reports
"79,10910,1564,2194". First number is number of power cycles. The second
number is the number of updates to the FC value. This value can be
updated manually, or is updated each power cycle or 12 hours. If this
wasn't updated manually many times, that suggests a very long operating
life (about 15yrs).
So, I wanted to get a sense of how healthy the unit is. The manual
describes two commands that seem to give an indication of health: DS?
and AD9?
The second number from DS? is the mV RMS strength of the "synchronously
detected signal at twice the modulation frequency." The manual also
says: "The amplitude of this signal is proportional to the strength of
the rubidium hyperfine transition signal." The manual states an example
of a good value is 55,800. Mine reports the second number between 670
and 680. The first number is low and oscillates around 0, as
expected. What is a good range for this second number? Is 670
reasonable?
The other command is AD9?, which is the photocell's I/V converter
voltage divided by 4. Mine shows 2.168. Any idea what's a healthy value
for this? Any other commands to run/check? Based on the age of this unit
(assuming the FC command is not misleading), should I only expect a few
years out of this unit, or is it hard to tell?
Thanks
Matt
Hi Matt,
I have just recently bought two new PRS10s. I ran these commands for you on
them. Here is what I see:
FS!?
Result: 64,257,1347,1264 (unit1), 59,233,2569,2611 (unit2)
DS?
Result: 1070,1124 (unit1), 1053,983 (unit2)
AD9?
Result: 2.981 (unit1), 3.155 (unit2)
Not sure why the number of power cycles and running time is so high. I have
personally only power cycled them 5-6 times so far for testing and used
them for a total of 10-15 hours. Perhaps it was part of the factory
calibration/testing? I might have to look into this later. At any rate, I
am pretty sure they are working fairly close to factory spec.
Cheers,
Krishna
On Wed, Nov 16, 2022 at 12:54 AM Matt Huszagh via time-nuts <
time-nuts@lists.febo.com> wrote:
Hi,
I recently received a used PRS10. The unit appears to work fine, but may
be a bit old. The serial number is 18508, which is lower than many of
the others I've seen. Additionally, running FC!? reports
"79,10910,1564,2194". First number is number of power cycles. The second
number is the number of updates to the FC value. This value can be
updated manually, or is updated each power cycle or 12 hours. If this
wasn't updated manually many times, that suggests a very long operating
life (about 15yrs).
So, I wanted to get a sense of how healthy the unit is. The manual
describes two commands that seem to give an indication of health: DS?
and AD9?
The second number from DS? is the mV RMS strength of the "synchronously
detected signal at twice the modulation frequency." The manual also
says: "The amplitude of this signal is proportional to the strength of
the rubidium hyperfine transition signal." The manual states an example
of a good value is 55,800. Mine reports the second number between 670
and 680. The first number is low and oscillates around 0, as
expected. What is a good range for this second number? Is 670
reasonable?
The other command is AD9?, which is the photocell's I/V converter
voltage divided by 4. Mine shows 2.168. Any idea what's a healthy value
for this? Any other commands to run/check? Based on the age of this unit
(assuming the FC command is not misleading), should I only expect a few
years out of this unit, or is it hard to tell?
Thanks
Matt
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Krishna Makhija via time-nuts time-nuts@lists.febo.com writes:
I have just recently bought two new PRS10s. I ran these commands for you on
them.
Thank you Krishna!
Here is what I see:
FS!?
(This is FC!?, right?)
Result: 64,257,1347,1264 (unit1), 59,233,2569,2611 (unit2)
DS?
Result: 1070,1124 (unit1), 1053,983 (unit2)
I'm a bit surprised by the first number here. I wonder why that's so
high - the manual indicates they should oscillate around 0. Those second
numbers are nice and high though.
AD9?
Result: 2.981 (unit1), 3.155 (unit2)
Not sure why the number of power cycles and running time is so high. I have
personally only power cycled them 5-6 times so far for testing and used
them for a total of 10-15 hours. Perhaps it was part of the factory
calibration/testing? I might have to look into this later. At any rate, I
am pretty sure they are working fairly close to factory spec.
That sounds like a reasonable explanation. Maybe someone else will know
for sure.
Thanks again!
Matt
Good Morning Matt. We do not know what you plan to do with your two PRS10's. We are presently testing a PRS10 to reduce Diurnal as Tom recommended. We do this with different time constants and different GPS receivers. This is work in process not ready to be shared with time nuts but if you are interested contact me off list ewkehren@AOL.com
Bert Kehren Palm City Florida
In a message dated 11/17/2022 8:21:03 AM Eastern Standard Time, time-nuts@lists.febo.com writes:
Krishna Makhija via time-nuts time-nuts@lists.febo.com writes:
I have just recently bought two new PRS10s. I ran these commands for you on
them.
Thank you Krishna!
Here is what I see:
FS!?
(This is FC!?, right?)
Result: 64,257,1347,1264 (unit1), 59,233,2569,2611 (unit2)
DS?
Result: 1070,1124 (unit1), 1053,983 (unit2)
I'm a bit surprised by the first number here. I wonder why that's so
high - the manual indicates they should oscillate around 0. Those second
numbers are nice and high though.
AD9?
Result: 2.981 (unit1), 3.155 (unit2)
Not sure why the number of power cycles and running time is so high. I have
personally only power cycled them 5-6 times so far for testing and used
them for a total of 10-15 hours. Perhaps it was part of the factory
calibration/testing? I might have to look into this later. At any rate, I
am pretty sure they are working fairly close to factory spec.
That sounds like a reasonable explanation. Maybe someone else will know
for sure.
Thanks again!
Matt
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