Aren’t the venerable Tek 222, 222PS, and 224 also intended for that kind of use, up to about 400 or so volts on the probes?

Chuck Harris makes a great point...don't repeat mistakes that have already been made. In his case, it might have cut his life short. It has cut short the lives of very experience engineers. If you're

Are the new digital scopes also grounded to the earth ground? Only when plugged into 120V and not using the battery that is inside to usually power my digital scopes. I like this

Hi folks - quick intro since this is my first post. I'm a guy who wants to repair old computers/video came consoles, and about as green as one can be when it comes to using an oscilloscope. I'm not

Hello, Today I turned on my lovely 455 just to find a pretty fat and kinda fuzzy trace on screen. Does not look good and well defined as it used. I try to raise the intensity and refocus only to find

Will probably sit for a while. The last 7904 I bought cost me $25 at a hamfest. Bought it for parts and turned out to be 100% functional. -- Paul Amaranth, GCIH | Manchester MI, USA

https://www.facebook.com/marketplace/item/2672172223098237/ Tektronix Oscilloscope model 7904 + Tek Lab Cart model 3 $700 in Lake Oswego, OR

Dennis, I’d be interested. George

I fried my refrigerator and the digital display board in my freezer when I connected them to a generator during a hurricane. They worked for a while but soon developed problems. Since then I've picked

Hi all, Another call for help to improve my scope. Does anyone know what might be causing this problem? I have unsoldered all the alu caps and checked, a couple were marginal and I replaced since it

Isolating the scope may protect the scope from catastrophic currents, but it does nothing to protect the scope's operator. The front panel on most lab grade scopes is grounded to the same ground as

Hi all, It’s been a couple of years since my last appeal. I’m looking for the vfd display used in the counter timer of the 2236. Part number is 670-7423-01 for the small board and 150-1110-00

For safety, the generator should be grounded to the single point utility ground for the building it will be providing power to. The NEC probably requires this, I do not currently have access to a

Robert: Most generators have a distorted sine output, depends on rating, and design. Some have quite high THD. Other have terrible transients and EMI. Normally the mfg will have complete specs.

Be careful connecting appliances with a standby mode to a generator. On a couple of power cuts I connected my coffee maker to the generator and both times fried the standby circuit. Simon

At issue is how the generator is internally connected, and the possibilities of accidents.... and on whether or not you are willing to bet your life that the generator is connected the way you think

Even if you have a dedicated ground rod for your generator, please bond (connect) that ground and your house ground (generally a bare wire coming from the ground rod to the electrical panel). Since a

Bob, I am reproducing your email with a few response comments...  and it might also be helpful if you indicate what type of generator you have (KW rating, voltage/phases output, etc).  Also, whether

Also, I just checked the main breaker panel and the ground and neutral are on the same bus bar. My extension cord for the scope will have a triple tap on the end. So I can use one of the ground hole

Since I will not be connecting the generator to house power, I should be safe connecting house ground for my scope test. I want to see the shape of the power, the frequency and peak voltage. I think a