...third lens came today - same model as the first, but this time a definite fault.
... very restricted travel on the focus ring, a few degrees of turn (from infinity to 1 metre).
described as in good condition, 4 out 5.
...for those keeping score
England 10
Japan 7
France 0
...low score may get better - depending on recovering the cost. It was the most expensive of the three.
here is some interesting math about the tritium keychain
https://www.gammaspectacular.com/phpBB3/viewtopic.php?t=889
the skin exposure divided by area is interesting to me. thats a big number
But if you lose a hand due to this, you always have your teeth to make up for it.
The point in reading the above that I went, "Ah... hang on a minute there."
Was here:
If 2.7mS/y is for whole body exposure to background radiation and the odd higher source like a medical x-ray maybe we can assume that the entire area of the skin is exposed to this amount on average, so we can find the average exposure of 1cm of skin as follows:
I am fairly sure it doesn't work that way.
Also the experiment is invalid without measuring the xrays where are NOT absorbed but pass straight through.
If you have a choice to eat a radioactive cookie, ALWAYS pick the gamma cookie, if that has gone, pick the xray cookie.
Keithley 2400 broken as does not power on.
So hopefully it is a simple fix.
Will arrive next week
Benno
Will you share some details on the fix here? Would be interested in reading that!
Oops I differentialled AGAIN
I really need to get back to my clearance thread but sitting around in boring non Shack/Workshop places with idle hands leads to another Fluke to play with. I already own a better DC only one (895A) but a Fluke 887A AC/DC Null meter will be fun to play with.
After refitting the power connector it powered on (verry dim display however).
But when powered off for 2 days it wont power on the first few times and than power on normally.
It looks like the internal 12V and 5V power is in hiccup mode (you can hear it restart)
I have a news display on the way and figuring out why the power supply is in hiccup-mode (overload or component age / fail)
Benno
From RS
Small antistatic mat.
Antistatic gloves
25x 3W 3535 SMD LED's
HMC1118LP3D RF switches ..... any guesses what for ?
New local PC store.....one must support it right ?
2m HDMI cable
Logitech wireless mouse and KB set
64GB USB3 pen drive
5 port LAN switch.
300mm LAN cable
512GB SSD drive, USB3.2 and USB-C double ended thing.....I never knew they made them so small these days.
.. arrived today my GW Instek demo board - "education", not quite sure how this is going to pan out.
I've got the blues:
and a whole slew of other colours:
2x GH18 rubber protector from Gossen Metrawatt 2x series meters in Usa
Received some freebies
oh and this kit Dranetz PMIT
Some Wima MKP capacitors, back in the 1990s, when I was young, they were the most famous audiophile capacitors in China.
An Aristo M 76.
For the love of VFD (and e^pi)
70 parts to restore a Hp6117A, mostly metal oxide resistors and some capacitors (get rid of composition and old electrolytics).
god damn this is like the ending of jumanji
Full disclosure: I didn't have to spend my own money on this, but still just as exciting: a SAM100 system amplifier (20W, 2-20 GHz). I'm using it for some content I'm developing, but I'm also trying to come up with "fun" things to do with it that won't get me in trouble with FCC or my neighbors
And in the spirit of international understanding, I took the second picture with both a yardstick and a meter stick.
For the not too young a 5 1/4" floppy disc would have been a good size reference
I only have a 8" in the cabinet over here.
Too bad no floppy's for it.
Benno
A Pickett N500-ES slide rule
Need to go and check the 8" floppy that is part of my homebuilt clone SWTPc/6809 Uniflex system. I still have disks for it..