开云体育

On Mon, Jun 25, 2018 at 09:56 pm, Ed Breya wrote: > > Jeff, I have to disagree with your disagreement - when you short the PDA lead > of a scope CRT to ground, you are (rapidly) discharging the filter

It may not work here, but a way to test for high voltage w

Jeff, I have to disagree with your disagreement - when you short the PDA lead of a scope CRT to ground, you are (rapidly) discharging the filter capacitance of the internal carbon DAG or metallization

On Mon, Jun 25, 2018 at 07:45 pm, Jim Ford wrote: then short the exposed tip (which is at the end of the red lead that goes to the crt) to metalwork. If there is a spark, then the CRT is receiving the

I think that Jeff makes a good point here. There is no reason to test like that. You are very li

On Mon, Jun 25, 2018 at 06:27 pm, musicamex wrote: > > Good to hear. Ive read that the 460 is known for leaky caps on the adq > board. I just grabbed a working 460a with a screen that says "passed

Jim Yanik used an old computer ? Why am I not quite taken aback by this ? LOL If he's dead then he's dead, but at least he is remembered. If he is alive his health could be to the point where he might

No. That is not proper procedure, this is not a lawn mower. You let that ultor voltage arc you are beating the shit out of a bunch of precision resistors in the chain for the CRT bias, stressing old

I think I have a few low voltage supplies to check before getting to the HV stuff. Thanks. Sent from my Verizon, Samsung Galaxy smartphone

No, no ticking.? ?The scope loks and sounds exactly the same plugged in to the mains or not, power switch on or off. Sent from my Verizon, Samsung Galaxy smartphone

Yep, set for 120 VAC.? I did move the jumper to Mid voltage. I will try a night light in series as soon as I can.? Thanks, Jeff Sent from my Verizon, Samsung Galaxy smartphone

Good to hear. Ive read that the 460 is known for leaky caps on the adq board. I just grabbed a working 460a with a screen that says "passed self test". For under $100. I wont pick it up till my next

I REALLY like mine! But I can't compare to any other DSO's; it's the only one I've used. I haven't had any problems with it yet, capacitors or otherwise. Touch wood. --Toby

Was the 460a an improvement over the 460 regarding the leaking electrolytic capacitors? What is the general opinion of the 460a? Thanks

Jeff, Jim lives, or lived near Orlando, Florida. I tracked down his telephone number last year, but I have never got any answer. It just keeps ringing, so the account was still active. I know that he

Hello Jeff, regarding your comment quoted below, As I mentioned, I was not quite sure about the DM43, but on the DM44 (that has differential Delta time measurement), what it does is alternating 2

The original coating used when iintegrating spheres wee first used was barium sulphate in an emulsion. recipes can be found in the early literature. Bruce

First build/acquire an integrating sphere. Bruce

Turn the 7603 off, and then unplug the ht lead between the multiplier and the CRT (somewhat carefully! You may have to undo the P clip that holds the plug/socket to the end of the HT chassis to get

hi, LED measurements are made with a strict geometry & equipment; and accurate determinations are not always trivial. Some useful web sites with information are found at NIST (US) & NRC (Canada) as