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wrote: You misstated the sped of light in vacuum, which is 299792458m/s per Wikipedia, whereas your doc states "The speed of light in a vacuum is 224844343.5m/Sec = 0.2248m/nSec.", which is a 25%

Hi Merchison, I don't know about the 1502, but the 7D12 which I used has the ability to preset any velocity factor on the POLY scale between 0.67 and Air (which is one of the other distance scales).

Hi Albert, I think my derivation is valid and I know the VF can't be that high. Did I leave something out in the way I calculated it? My purpose in calculating it (regardless of whether I got a

Hi to All, Around the mid of 2013 their was a comparable discussion of this cable on: http://www.amplifier.cd/smf/index.php?topic=359.0 Now only accessible for Members. Nevertheless clues of it are

I know that. I was pointing out that the velocity of propagation in a cable is not the same as in space and that it depends on the physical nature of the cable, including its dielectric constant but

You need to get the specifications (using the part number on the cable) which you are going to use (or test) and plug-in the Velocity factor into the 1502 for the distance reading to be correct.

Hi Richard, The speed in a cable is mostly a function of the Dielectric Constant of the filling between the inner conductor and the outer shield. The dielectric constant of the filling along with the

Hi Tom, Wikipedia is your friend when it comes to Velocity Factors. Scroll down this web page https://en.wikipedia.org/wiki/Coaxial_cable Or in your web browser type "wikipedia coax" and it is usually

Hi John, Best would be to swap the trigger hybrid from one of your 2465 family scopes that does work into the one that doesn't work, as a test. (as long as you restore the original to the calibrated

With 134v on Q1496 collector, you should see +61v at Q1490's base. This will completely shut down the regulator by reverse biasing Q1494 b-e. That said it only leaves R1483, Q1496, CR1498, and R1488

Hi Chuck, The parametric functions do not work on one of my 2445Bs, the one you didn't calibrate.? It also doesn't sync on signal on start-up but does work well manually.? I chased this around? on

Hi all, I got (yet another for my collection) 2465, it was stated it had problems before I got it, so no problem there. What have I done so far: Recapped the Power Supply, cleaned the Siemens fan and

Hi Chuck, Nope. I found others for sale, but these were cheaper. Tom

Exactly! Have you tried their product? -Chuck Harris Tom B wrote:

On the 474A L.V. schematic it shows the expected voltage at the emitter of Q1496 as being 135.6 volts, which is quite close to your 134.66 reading at your +110 test point. It shows the expected

Hi Chuck, Like this: http://smallbear-electronics.mybigcommerce.com/nut-starter/ Tom

The document says: "The speed of light in a vacuum is 224844343.5 m/Sec= 0.2248m/nSec. " I guess Dennis already used some kind of velocity factor here. But this makes his following derivation invalid:

All members of the 2465 family use interchangeable trigger hybrids. To remove them, remove the four nuts at the corners of the module. Tektronix considered them all to be "selected"... which I think

of course, but only cal03. -Chuck Harris joe@... wrote:

Where does it show the speed of light in a vacuum? The TDR should be calibrated to the speed of light (electricity) in the cable. For 50 Ohm cable its about 66% of c. Varies with the impedance of the