Scopes with isolated inputs

The Tek TPS2000 series is great. We have a 2024 and I use it to work on power amplifiers and such. I can measure the gate-source voltage of a power mosfet, or opamp voltages, of stuff that's 200 volts off ground. You just don't care where you clip the probe ground lead. But they are expensive, starting at $3K.

The 2024 is £2940 ($4650) from Farnell. More than I like but a good spec.

If you're doing audio/power stuff, the 2012 would be fine.

Another option would be to buy some of these Yokogawa differential probes...

They are around $500 each and I find that the common mode rejection is much better than the Tekronix isolated input scopes I have used in the past.

boB

The tek tps scopes also pick alot of noise on an smps. Just run your smps from an isolation transformer then you can ground what you like. Much cheaper too.

Hmm. How do you get 100MHz through test leads? I'm still looking for a diff probe where I can use normal probes. Maybe even 3 probes. Hook one to a reference point and the other two to signals.

an isolation transformer then you can ground what you like. Much cheaper too.

Yes, I do this too, but those isolation transformers can have lots of capacitance from primary to secondary. I suppose I could use one with a faraday shield inbetween, but then where does that get tied ? Might not make it work the best.

As for a differential probe with BNC to use a regular probe with, I have wondered about that myself. I'd rather use a real probe but the leads work. Kinda funky in a lot of ways though. Very big for one.

I guess we need some kind of mini-probe for those hard to get to places. boB

$2460.

an isolation transformer then you can ground what you like. Much cheaper too.

You might poke around at

from an isolation transformer then you can ground what you like. Much cheaper too.

I liked these DMM probes so much I bought an extra set:

Spot on.

Won't ship outside USA :(

It's a great scope. Ship it to me and I'll forward it.

Thanks for the offer.

Ship to your business address?

Yup. Email me about the details.

Here's one:

Grrrr.

Testpath gave the order details to Tek. Tek UK rang this morning, the short of it is they won't let me pay in the UK even if the scope is delivered in the USA.

They've passed me over to the local TekSelect agent. Waiting to see what they'll quote. Not expecting a sensible price.

Still looking at this.

The standard probes supplied with the 2024 are only rated for the probe ground to be within 30V ac of ground.

The P5210 high voltage probe which does 600V ac betweeen probe ground and ground swll at £2020, $3130, each - plus power supply.

I'm now going to check what my Fluke probes are rated at, I may have close to an accident more often than I realized.

That's crazy. We ignore silly specs like that.

I have to sign onto it before my scope will drop the legal splash screen! Then I can ignore it.. at least my car automatically drops the nav splash warning screen after a period of time. But does have the annoying habit of saying "if possible make a LEGAL U-turn". It got screwed up and kept sending me back and forth east-west four blocks when the actual destination was a couple blocks further west, all the time reminding me to make a _legal_ U-turn. Technology is wonderful.