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I remember now that this involves adjustment of the LF Compensation. The calibration steps for that calls for a standardizer fixture and I don't have one of those. Is there a way to make that

Oops, I meant a 3S76, in case anyone thought I’d found an unusually rare (to the point of nonexistence) plugin. :-)

I’m fixing up my 564 and its plugins. The mainframe is now working, but I have multiple issues with a 3A6, a 3T76, and a 3T77. The lack of a plugin extender is making things awkward. I know the Tek

I recently acquired a parts donor for my working 468. The donor unit had a GPIB card which I tried to transplant into the working one. Having checked the documentation, I found that a DIP switch

Thanks Harvey You can confirm the following settings on the active probe: termination on EXT, the DC OFFSET on OFF and the INPUT COUPLING on AC ? Thanks, cheers Attilio

My 2430A is one of those. The batteries in the Dallas modules gave up a few years ago so I first lost trace storage and then the calibration data. I replaced both RAMs with Cypress FRAMs

Start by comparing the one you got to the one in the auction photo.

Which scope is this?

Since the P6201 has a variable offset in the box, it does (and will) put out a DC voltage.? DC block highly recommended.? I'd put it closest to the probe box, then run a short length of cable to the

---- Great news and congratulations for the repair. Internal to U50 pin 6 is the comparator reference that decides when the ramp reaches its peak. Ozan

Thank you Jean-Paul and JOE. Can you tell me how to set the active probe P6201? In any case I think it is essential to use a DC-block because the 492 does not accept any DC voltage at RF input.. Happy

Hi Barry, please reread message 187015. Albert

Yes - I was thinking it was digital noise coming from the readout character generation circuits. I tried the switch in the GATED position and that does indeed eliminate [almost] all of the gaps in the

I recently rescued a 535A from the scrap heap and/or (audio) tube thieves. I needed t as a parts donor for my 575 and have no intention of restoring the 535A, myself. It served as a mouse hotel (from

There's likely no relationship between the chopping frequency and the sweep speed.? I'd go for random. You're thinking that this behaves like digital, perhaps? Harvey

Hi Harvey, I'll see if that resolves the issue. The way that the blanks move along the trace, it seemed a more random effect than I'd expect when writing to the same locations each time but maybe not.

Do not do anything. There is one beam.? It has to be "borrowed" to write the readouts. There are two ways: 1) Borrow the beam when it's needed.? This chops tiny holes in the trace.? it's going to

Correction: The READOUT switch connects to the -15V rail through R5006, not the +15V rail. Thanks, Barry - N4BUQ

Hi, Yes, they are different. The 2430A is more in line with the 2432 and 2440. The 2430 (not A) even has a different front panel. Check right below the horizontal speed knob, the A version has more

When displaying a sine-wave where several cycles/division are present, when the READOUT is switched on, there is noticeable "noise" (for lack of a better definition) in the trace. It appears as tiny