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I didn't make it up. Take it up with the tex

but if there is any variation in potential then you can select an arbitrary ground potential that will result in some portion of the signal have a reversed flow of current, so the only unquestionably

Jeff, The pulse rise time at the scope input gets (with such a fast generator) determined by the effective RC at the scope input. Without terminator that will be 1 ns, with terminator 0.5 ns. That

Dear Ed, Thank you very much for your reply and forgive for taking so long to reply. I was out on vacation with my family. Since there is a trimpot in series with this resistor, I am inclined to keep

Taking our banter still one step further: Of course, I agree with that. The "DC level Output" used while adjusting the 'scope in this case is supposed to have a fixed potential, lest it would make its

Okay, I looked up some stuff in my long forgotten transmission lines book from college. To match impedances, the source resistance must also be 50 Ohms, in series, to match the cable and the 2465

In a quibbling mood I might point out that DC is frequently defined as "current flowing in one direction" without implying a fixed potential :) --T

I've taken a low quality video of the screen as I use the test routine to step through the values. If the EAROM? ever fails, I'll dig out the video and transcribe the values. I would look at seeing

In a cocky mood I'd say a DC level is not a signal; it contains no information. Switching a DC level on or off however is. Raymond

Do you have any advice on backing up the EAROM in a 2465? I'm assuming it's easy enough if the scope has a GPIB interface (mine doesnt), but I'm not sure my ancient Data IO programmer knows about

Picked up a 2232 scope recently at a Club auction. Pulling it from the case I found the J9011 connector broken and the eight wires to it dangling. As was suggested in the Group I hard wired the eight

I tried mine on a 2815 (like a 2225) 50MHz without and with a 50 ohm feedthru at .05uS each pulse is about 1 div spaced by 1 div not a perfect square wave but pretty close at that speed, fastest on

Stephen, Yes, I did some of that while trying to identify the source in mine. I thereby managed to determine fairly conclusively that the leakage in mine is within the switch array, rather than on the

Also correct. The procedure calls out 50 Ohm BNC Cables not a 50 Ohm Termination. Ross

And even if the output were a current-mode amp with a 50 ohm termination, you’d still see a factor of 2 reduction with another 50 ohms loading it. Something about Thevenin or parallel resistors or

The generator establishes its output resistance using a series 50 ohm resistor, not in parallel. The output amp is voltage mode and designed to have a very low output Z, as any other voltage source.

A few other comments... Calibrating the 2400 Series Oscilloscopes is a manual, tedious process. It can be very frustrating especially if you don't have the equipment called out in the Calibration

Comments below: Ross

But did you measure the ripple? It's EASY to do with your DVM: Just switch to ACV So, check the voltage with the DVM set to DCV, then switch to ACV and you've got the ripple. Your DVM probably won't

Well I really messed up the vertical calibration today after getting limit errors on all the ranges. But I figured out the problem. My signal generator output was only 1/2 of what it was supposed to