Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Hi Even *with* all the fancy stuff in my Fluke thermometers … they still are only rated for a bit worse than 0.1 C. When I send them in for calibration, the thermometer generally comes back “calibrated fine”. The thermocouple I send in with them often comes back with a note about “you need to

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Hello to the group. I somewhat suspect we have veered way off the track on the thread or the thread changed and I missed it. Typical of me. Useful comments on Tcouples and wires. But with respect to the start of the subject of unmarked CS tubes easily a 5 or more degree range is fine. You can

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

If you want sub degree precision, you will need to make your connections to dissimilar metals on an isothermal boundary, a terminal block is better than clips in free air. On Fri, Nov 11, 2016 at 8:28 AM, Bob Camp wrote: > Hi > > > On Nov 11, 2016, at 8:02 AM, jimlux

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Hi > On Nov 11, 2016, at 8:02 AM, jimlux wrote: > > On 11/10/16 10:28 PM, Mike Millen wrote: >> It would work as well if you used a pair of regular copper wires to >> connect the meter to the thermocouple... >> >> The junctions created by all the new connections will

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

On 11/10/16 10:28 PM, Mike Millen wrote: It would work as well if you used a pair of regular copper wires to connect the meter to the thermocouple... The junctions created by all the new connections will cancel out. as long as the temperatures are "exactly" the same, (Seebeck coefficient

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Quite true, of course. I was only anticipating a quick-&-dirty temperature check... I should have realised that q-&-d isn't in a Time-Nut's vocabulary. :-) Mike On 11/11/2016 06:39, Bill Hawkins wrote: Well, they cancel if they're at the same temperature. Bill Hawkins -Original

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Well, they cancel if they're at the same temperature. Bill Hawkins -Original Message- From: Mike Millen Sent: Friday, November 11, 2016 12:28 AM It would work as well if you used a pair of regular copper wires to connect the meter to the thermocouple... The junctions created by all

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

It would work as well if you used a pair of regular copper wires to connect the meter to the thermocouple... The junctions created by all the new connections will cancel out. Mike On 10/11/2016 20:53, cdel...@juno.com wrote: Skip, The easiest way to determine the oven resistor values for

[time-nuts] Need some wisdom from the cesium beam tube gurus out there

In the whacky world of thermocouple color codes, the RED wire is usually the negative! The other wire color is usually an indication of the thermocouple type. YMMV... nothing is hard and fast about thermocouple colors. --- > Connect the wires to your meter matching the

[time-nuts] Need some wisdom from the cesium beam tube gurus out there

Skip, The easiest way to determine the oven resistor values for an unmarked tube is to directly measure the oven temperature and select a resistance to set it at the temperature you want. Your tube is a STD tube so I'd set it at 90 degrees C. Take a thermocouple meter and thermocouple and cut the

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Skip Not the expert but as you say the lower oven temp means higher em and visa versa. Funny you mention no writing in some document or ebay pixs I saw the same thing a tube with no details. So that now makes 2 instances of no marking. My non-professional 10 cents put a tube in you know. Set EM to

Re: [time-nuts] Need some wisdom from the cesium beam tube gurus out there

Hi I would bet that they started as you have with a low oven setting and cranked it up based on stability data. Once they got to that point, add a bit to have enough margin on the tube for it to last the rated life. Since there are multiple quantum “modes” the beam can get into, there may

[time-nuts] Need some wisdom from the cesium beam tube gurus out there

Hello Time-Nuts, I have been checking out some cesium beam tubes lately and have run into an interesting one. The tube is a standard HP 05061-6077 unit. There are two labels on these tubes, one at the end that has a serial number, and the other large label on the side that has the operating