Maybe I need another 'scope?

I have been looking at some on eBay. Do you have any suggestions? Thanks, Eric

I'm sure you intended humor but I am appalled you buy beer in bottles.

Light is the enemy of beer, and the better beers are the more fragile.

If you like that nasty skunky taste, okay; but we real beer drinkers buy in cans.

Thanks Tim. That was just the sort of advice I was looking for. I don't have a lot of experience with oscilloscopes and every time I use mine I need to make sure I'm very careful to get everything set correctly. Eric

Look into it at this company. They often put it on sale and with free shipping. I bought one there and a friend did also. They seem to be fine scopes for the price, especilally if you have an analog scope to use. They sell several other scopes of the same brand along with many other items at a good price.

it won't change the signal, except for very high frequencies far above audio

NT

Not really, totally depends what you want

NT

Does it have a separate A/D for the voltmeter, or is it stuck with 8-bit resolution?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

My next one might be something with serial decode.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

Yeah, I usually buy beer in cans. More often now good beer is available in cans. It used to be good local beer was only available in brown bottles. It is truly amazing how much good beer there is today. Eric

What does serial decode do? Thanks, Eric

I think you forgot to include a link. Eric

It reads out the hex data on a serial bus such as SPI or I2C. Sort of a poor man's logic analyzer.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

I use a serial decode scope all the time -- to debug vehicle CAN bus transactions. It's more of a rich man's logic analyzer. It can do so much more than a logic analyzer.

Terry

Yes I did.

I don't know how it determins the voltage. It does give the frequency and time period. Not too sure how accurate it is, but did read a 9 volt battery to 2 decimal places, but I did not check it with my digital voltmeter to see how close it was. For all I know it could have been off half a volt. I don't use it when I want a ver accurate volt measurment,but as I am just using it for hobby work, good enough for me most of the time. This is not a high dollar test instrument.

** Yes - plus VTVMs have wide frequency response on the AC ranges unlike the vast majority of hand held DMMs. ** Ripple voltage on the first filter cap ( after the rectifier) in a PSU l ooks *sawtooth* shaped - not sine wave. The voltage rises sharply during c harging and falls slowly when discharging. y ** That is a massive understatement !!.

Ripple voltage during normal operation should not be greater than 10% of th e DC supply voltage. So, for a 400VDC supply, the p-p ripple seen on a scop e should not exceed 40Volts. An AC voltmeter will show about 14V instead, long as there is a cap ( say 0.1uF) in series to block the DC voltage.

... Phil

diagnosing my CNC equipment. All the voltages I have needed to measure have been below 50 volts. But looking at the 'scope it seems like at the 10x se tting on the probes the highest voltage I can measure is 200 volts. That's

4 divisions at 50 volts per division. And that's peak to peak, not RMS. I d o have one 20x TEK probe, a P5120, that I used for measuring the mains powe r, but the voltages inside tube equipment go much higher. "

Get a 100:1 probe. They have them on eBay for less than $20. If you don't l ike eBay there are alternatives. that will igve you 500V/div. at the highes t setting. Don't use it on AC coupling though it takes 10 times as long to settle. Well you can buti t takes 10 times as long to settle.

advice. "

The only way a scope would help is if you get an older one that goes up to

20V/div. which would be 200V/div. at 10:1. I keep at least one around just for that. A probe is cheaper unless you want to trade me that 465B for an o lder Tenma or B&K or something with the higher voltage ranges, but only 15 or 20 MHz bandwidth.

and all that I need everybody to know that I am expert and know all there is to know about working with high voltages."

Famous last words, right up there with "y'all watch this" but I am not your Mommy. I can tell you this, you ain't been shocked until you been shocked by tube equipment. If you really want some thrills try the cathode of a dam per tube in a color TV from the 1960s.

g around high voltages."

That is a very foolhardy attitude, you could spill it !

high voltages."

Pussy.

Marys either."

That's a tokillya sunrise you sot.

The shakes is not from alcohol withdrawal, it is from mineral deficiencies. Get a comprehensive colloidal supplement and take a shot of that before yo ur eye opener every morning.

one in a proper enclosure and how to use it properly."

Don't bother with tube equipment unless it is blowing the line fuse. It doe sn't like variacs much especially if it has a tube rectifier. Actually if y ou have selenium rectifiers use a DBT with all the tubes pulled. Also -

und high voltages..."

If we don't hear from you anymore we'll figure yes. Update your will.

A proper Bloody Mary has a salted rim.

Low potassium will cause cramps and shakes. Oranges, orange Juice, a banana, and so forth will address that issue nicely. V8 juice as well, tomato juice, more so.

Peter Wieck Melrose Park, PA

Yah, all that trace mineral nutritional data is super dodgy. Some grad student in the '50s measured three bananas from a plot fertilized with potash, and surprise surprise all bananas became "a good source of potassium" forever, no matter what soil conditions they're grown in.

Nutrition 'science' is largely a cargo cult.

Cheers

Phil Hobbs