[time-nuts] R XSRM Rubidium Standard

Thanks for the replies to this, both on and off list. Repairs to the wiring turned out to be fairly straightforward and all now seems to be basically functional, but there still remains the problem of the lamp. I am told that the FRK lamp is not a direct replacement, the base is smaller,

Re: [time-nuts] R XSRM Rubidium Standard

correct ! In a message dated 9/17/2017 1:51:30 P.M. Eastern Daylight Time, cjaysh...@gmail.com writes: Yes. An instrument with a calibration certificate is not necessarily accurate but it's inaccuracies are known and can be compensated for (but only to the accuracy of the calibration

Re: [time-nuts] R XSRM Rubidium Standard

good point In a message dated 9/17/2017 2:01:01 P.M. Eastern Daylight Time, jim...@earthlink.net writes: On 9/17/17 9:42 AM, KA2WEU--- via time-nuts wrote: > Simply call it " Make it to meet specification", N1UL > > > In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight

Re: [time-nuts] R XSRM Rubidium Standard

On 9/17/17 9:42 AM, KA2WEU--- via time-nuts wrote: Simply call it " Make it to meet specification", N1UL In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight Time, mag...@rubidium.dyndns.org writes: Hi, The word "calibration" is overloaded with multiple meanings, and

Re: [time-nuts] R XSRM Rubidium Standard

Yes. An instrument with a calibration certificate is not necessarily accurate but it's inaccuracies are known and can be compensated for (but only to the accuracy of the calibration reference of course.) On 17 Sep 2017 17:39, "Magnus Danielson" wrote: > Hi, > >

Re: [time-nuts] R XSRM Rubidium Standard

Simply call it " Make it to meet specification", N1UL In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight Time, mag...@rubidium.dyndns.org writes: Hi, The word "calibration" is overloaded with multiple meanings, and incompatible too. "calibration" is often used to describe

Re: [time-nuts] R XSRM Rubidium Standard

Hi, The word "calibration" is overloaded with multiple meanings, and incompatible too. "calibration" is often used to describe adjustments to make a device operate correctly, such as passing the performance checks. "calibration" in legal traceability is about measure the performance

Re: [time-nuts] R XSRM Rubidium Standard

As to the point most modern instruments have self calibration, Most of the time 'calibration' is simply the performance check adjustments are not performed unless necessary The difference being the instruments used in performance test are traceable to a national standards body. So whats

Re: [time-nuts] R XSRM Rubidium Standard

And if the performance is not validated, then they fix it.. I hope. I do a lot of phase noise measurements , spectrum analysis and power measurements and S/N ratio measurements so I need correct tool . In a message dated 9/17/2017 11:23:31 A.M. Eastern Daylight Time,

Re: [time-nuts] R XSRM Rubidium Standard

Modern test and radio equipment have self calibration capabilities, older analog do not. Calibration is not always need for just simple test, but for specification conformation it is useful. A bit of luck also helps. In a message dated 9/17/2017 8:08:00 A.M. Eastern Daylight Time,

Re: [time-nuts] R XSRM Rubidium Standard

On 15 Sep 2017 10:45, "Scott McGrath" wrote: > > Precisely my point, But when purchasing i expect to pay for a calibration at a minimum. I have on occasions requested sellers to send an item to the manufacturer (Agilent or Keysight) for calibration *before* shipping it to

Re: [time-nuts] R XSRM Rubidium Standard

I do enjoy the 'chase' of repairing things other people have discarded as beyond economic repair, my CMU200 came with a rather amusing fault as well as a good example of poor industrial design choice, it's now a very useful piece of equipment. I often scrounge faulty electronic equipment just

Re: [time-nuts] R XSRM Rubidium Standard

I almost always buy equipment that isn't working. It's fixing it that makes it interesting. What would I do with all the testgear if I didn't use it to fix the next bit ? On Fri, Sep 15, 2017 at 9:34 AM, Michael Prescott MSc < mike_presc...@hotmail.com> wrote: > I second Clint’s statement, most

Re: [time-nuts] R XSRM Rubidium Standard

I second Clint’s statement, most of the test equipment I’ve brought have worked on switch on. I did buy a R CRTU with no LCD display and paid £400 for something which didn’t work I had a lot of deep thoughts. It turns out CRTU was only nine years old and two months out of calibration, the

Re: [time-nuts] R XSRM Rubidium Standard

Precisely my point, But when purchasing i expect to pay for a calibration at a minimum. Helps to make friends with the local cal lab though as frequently far better pricing can be negotiated if you can get your instruments done on a non-critical basis as most of the business of a lab is

Re: [time-nuts] R XSRM Rubidium Standard

Experience has shown me that you can reasonably purchase good, working test equipment that's well within calibration tolerances if you are buying the more 'common' equipment, 6.5 digit meters, frequency counters, even a Stanford SR620... I've been very lucky with those, two spectrum analysers and

Re: [time-nuts] R XSRM Rubidium Standard

Its an unrealistic expectation that equipment from the well known auction site will work and be 'in-cal' Its realistic to anticipate several the purchase cost to get well priced instruments back 'in-cal'. But hey if i spend 2 k on a sweeper 3 k to fix and cal it and BlahTest is charging 10k

Re: [time-nuts] R XSRM Rubidium Standard

To all: I would highly recommend not to buy used test equipment on e-bay , mine (R) or HP or similar. These pieces are mostly out of calibration , defective , just too expensive to repair. I have 3 XSRM systems, which I co designed in 1970, they came from e-bay and needed $ 5000 + to be

Re: [time-nuts] R XSRM Rubidium Standard

On 9/12/2017 5:58 AM, GandalfG8--- via time-nuts wrote: A friend of mine has bought a just out of calibration R & S XSRM Rubidium standard from one of the so called "recyclers" on Ebay. Nigel / David, Sorry to hear of your "bargain".   However I doubt very much that the lamp was made by R

[time-nuts] R XSRM Rubidium Standard

A friend of mine has bought a just out of calibration R & S XSRM Rubidium standard from one of the so called "recyclers" on Ebay. Although the price was good, and it came with the off air receiver, phase meter, and frequency divider, it looks to have been heavily decommissioned with