Westclock Atomic Clock Model 70026 Temperature Reads Lo
Accumulated results from several astro outings....
10 April: 175-26-13.0
15 April: 175-26-08.3
24 April: 175-26-01.2
NGS Published Az between AA8189 and AA8188: 175-25-56.7
The round this morning (all viii direct, 8 reverse) surprised me. Wanted to minimize out scintillation. It was 25 F when I started. Note to self: Don't attempt to engage in activity that demands blank finger dexterity (iPhone UTC timer), when information technology's beneath freezing. A later round from some other setup nearby was disasterous because of it. My fingers were locking up. I'm finding that information technology works best if a smooth repeatable rhythm of setting the crosshair perhaps 10-15 seconds ahead of the trailing limb is accomplished. I constitute it harder and harder to do the colder my fingers got.
I'll exist pleased though if I can continue to achieve the results I'm coming into.
Topic starter Posted : Apr 24, 2016 3:34 pm
I'm persuaded pure curiosity drives a lot of surveyors. Then they figure out a way to make information technology pay the bills. Then they want to buy new equipment. Then they figure out a style to make it pay the bills. So they desire to buy new equipment.
Posted : Apr 24, 2016 3:50 pm
Some of the people here are thrilled when the temp gets above -25F. I'm non i of them, fortunately. I wouldn't fifty-fifty attempt to fire upwardly the survey chariot if it was that cold.
BTW, it was 81 yesterday and fairly close to that today.
Posted : April 24, 2016 4:36 pm
Cool dense air has its upside.
Astro, fifty-fifty if avocational, has a lot of spin off educational benefits. It'southward persuit of agreement by doing.
Posted : April 24, 2016 seven:00 pm
In the eye of traverse, we quickly sighted alee of the sun and made "mark" when the sun reached the crosshair, recorded the fourth dimension and bending and repeat v more times then turn to check the backsight and record any change. This usually took less than a infinitesimal from start to end. Much faster than trying to use a magnetic needle on a TS.
Posted : April 24, 2016 vii:04 pm
Y'all mentioned an IPhone UTC Timer. Accept y'all compared it to the radio time broadcast? I accept the Navy Clock app on my telephone and I go shut to a full 2d departure in it and the radio broadcast. I think it is the digital filibuster in the cell system but that'southward just a judge.
James
Posted : Apr 24, 2016 7:55 pm
The fourth dimension app he used is by Sequoia: Time Stamp. NTP, feedback loop. One-up-same equally GPS, WWV. However, only 0.1" resolution. And at low altitude the dominicus's rate of change in az isn't bad. Most 12 arc-seconds per second.
Sequoia's fourth dimension apps are highly tested and regarded every bit true NTP. And NTP is millisecond.
Emerald Time by Emerald Sequoia LLC
Emerald Timestamp by Emerald Sequoia LLC
Posted : April 24, 2016 8:09 pm
Larry Scott, post: 369201, member: 8766 wrote: The time app he used is by Sequoia: Fourth dimension Postage. NTP, feedback loop. One-up-same as GPS, WWV. Even so, only 0.1" resolution. And at low altitude the dominicus'southward rate of change in az isn't bad. Most 12 arc-seconds per second.
Sequoia's fourth dimension apps are highly tested and regarded equally true NTP. And NTP is millisecond.
Emerald Time by Emerald Sequoia LLC
Emerald Timestamp past Emerald Sequoia LLC
I unremarkably bank check the "Time" app first, which polls as many every bit v dissimilar time servers; It usually reports errors in the .025" region. So, in the field, I use the Timestamp app, which (every bit Larry reports), is only "good" to .1" resolution, only for my purposes, information technology's probably beneath the threshold of some of the other errors I'chiliad dealing with.
I do need to invest in some kind of stopwatch; ideally i that can log the times. More than in one case already, I've gone back to Timestamp to detect errors in booking the times in the field. Other "requirements" would be: one. Expressionless simple (no caste in nuclear physics needed to set or program), 2. Large, easy to read numbers--fifty-fifty in the dark (remember, it's astro), and 3. Foolproof button organisation then I tin't accidentally wipe information technology's memory with a wrong press. Any suggestions welcome.
Topic starter Posted : April 25, 2016 3:29 am
A xx cadet lookout isn't a commitment til a much better (more $) timing tool is constitute.
HP41 has a great feature, and was a staple for Astro from the 80s til even now. The 41's buttons tin be assigned to take hold of its organisation time. At its clock tin adjusted by 0.01", so it can be aligned to UT1 very well to curt wave radio or GPS.
I used to telephone call 1-800-410-time. That was NIST's WWV by telephone. That was cool, back in the day.
The HP41 withal is the all-time Stop Clock, and piece of cake to hold. Merely drop prone.
Posted : April 25, 2016 6:47 am
Larry Scott, post: 369238, member: 8766 wrote: A twenty buck picket isn't a delivery til a much better (more than $) timing tool is establish.
HP41 has a groovy feature, and was a staple for Astro from the 80s til fifty-fifty at present. The 41'south buttons can be assigned to grab its system fourth dimension. At its clock can adjusted past 0.01", so it tin be aligned to UT1 very well to brusque moving ridge radio or GPS.
I used to call 1-800-410-time. That was NIST's WWV past phone. That was cool, dorsum in the day.
The HP41 nonetheless is the all-time Stop Clock, and piece of cake to hold. But drop prone.
If I'm going to get anything, it'll be a lanyard-ed, back-lit hand held unit.
Dumb question: Never run, swam or participated in any timed sports (fortunately). For the purposes of Astro, do I use a "Split" time? I looked it up, merely am not sure that split up times are just recording the running clock,
similar:
0143.01
0154.23
0102.fifteen....
Are those "split" times?
Topic starter Posted : April 25, 2016 6:58 am
I ever used the hp41 when I did sunshots. I always got relatively skillful results. I check and adjust the time earlier I go out, and afterward I go dorsum. Sometimes I would proportion in the difference in fourth dimension (every bit I call up).
Equally to common cold fingers, I looked @ information technology this mode; if I am consistently (as example) 0.2 seconds late hit the button when it beeps, I am probably besides the same 0.ii seconds behind the crosshair "hit" when I am observing. Since I gear up my fourth dimension by my button hit, the 0.two 2nd delay compensates itself out if the delays are equal. Information technology might be expert to prepare your watch in the same temp surroundings as when you are doing the solar. (too maybe a land line because of possible cell-delay? I don't know annihilation about that.) Maybe I am incorrect near this, only my solars that were checked confronting North-star observations seemed to be very close.
Posted : Apr 25, 2016 7:02 am
Lap times, I think. My SW is labeled standard and department. All the watches take both. And I think can switch without data loss. But it'south vocabulary thing.
Start the SW and it'south a free running clock, starting at 0.00. And then a Lap time is time since 0.00. When a time is taken, the display is stopped for recording. When released, not commencement/finish, the display returns to the running clock, time since 0.00.
Starting time 0.00
Lap 030.34
Continue, returns to running time eg 0....
Lap 0;03:01.57
Continue, 0.....
Lap 058.79
Continue.... Cumulative time since start.
Splits are terminate/reset/run in one push.
Dissever 030.45
Split 015.45
Carve up ....
Not cumulative, segmented
(I might have the terms swapped, but the two modes are typical to all SWs)
That'due south the beauty of Stamp. A cease clock. Non common. But stamp is the right concept, iPhone not the correct form cistron.
Backlit is not common. Too much ability consumption. I've never missed it.
_______________
I'm sure a telephone time was retarded. Shortwave times accept an add together for distance to Boulder, CO, too. Not a lot. The timing beeps are hard to really nail. GPS is good. A Garmin handheld has some flakey delay for screen update. iPhone NTP feedback loop screen display is plenty expert. And mitt-eye delay should be a personal constant. And so as I time a running display, I should be delayed a like amount for the crossing of a star, and like to the 0 of any ane minute on the iPhone display. I've tested it every which way. With sun nailing tangent is a learned skill, and personal, timing delay, constant. Stars are improve in that way.
I have an old textbook that describes time transfer past telegraph and spark transmitter radio. That was difficult. We have it piece of cake.
Posted : Apr 25, 2016 8:08 am
I recollect a $40 SW will practise exactly the same matter for you as a $140 SW. These days nosotros have timing well below 0.1". When I compare a dozen time syncs, with SW to iPhone display and shortwave, the std dev is generally 0.02". Hand-center filibuster? Probably. But that would be the aforementioned mental time lapse of a star crossing.
Posted : April 25, 2016 viii:39 am
Larry Scott, post: 369265, member: 8766 wrote: the same mental fourth dimension lapse of a star crossing.
Wouldn't those errors add?
Merely when yous check the watch against a time source, that response delay would be about the same as the delay in hitting the button upon seeing the object striking the crosshair so THOSE would more often than not cancel.
Posted : April 25, 2016 9:37 am
JaRo, post: 369198, member: 292 wrote: You mentioned an IPhone UTC Timer. Have you compared it to the radio fourth dimension circulate? I take the Navy Clock app on my phone and I get close to a total second departure in it and the radio broadcast. I think it is the digital delay in the jail cell organization but that'south just a guess.
James
Navy Clock will piece of work differently on different phones.
It would bear witness around 43± seconds different on my droidX phone but similar the time lag that shows up on my Garmin handhelds.
Samsung S5 will sync with Navy Clock and is spot on with time.gov
and with my Westclox Atomic Clock model #70026
Some day I promise to exist able to check it with a time cube or other proven source.
The HP41 had a smart clock routine that would go on better time after each correction. Information technology would keep track of the corrections and would somewhen keep real time for weeks. Dead batteries or taking the batteries out would erase all that info.
Posted : April 25, 2016 eleven:21 am
Source: https://surveyorconnect.com/community/surveying-geomatics/the-suns-not-getting-any-warmer-so-i-must-be/
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