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Yes, for best frequency response the ground lead should be short and the area between it and the probe minimal. You may see ringing and other strange stuff with your separate ground lead. Probably OK

Hello Folks, Thanks for all thoses interestings comments. As Ive reconnected the ground, and turned power ON : no differential main shut down occur, even when my finger played with chassis parts. I

Well, after a week on vacation, I replaced the old 18,000 uF, 16 V C821 with a new 22,000 uF, 25 V job that was the same diameter but less than half the length. I knew I was going to be out of town,

Our work benches vary quite a lot, and things found useful by some may not even be at others places: I have a relaltively common magnifying goose-neck lamp. The tubular fluorescent lamp surround a

Hi John, It's good to hear that you are making progress on your 475. Those large capacitors for the low voltage supplies in the aluminum cans often fail internally and do not show any bulging or other

On Wed, 15 Aug 2018 15:25:30 -0700, you wrote: >It turns out that C965 (Board A9), a tantalum bypass capacitor on the +15 rail had gone bad; removing brought the +15 rail resistance to ground back to

Look for a tantalum with a small hole in it.

It turns out that C965 (Board A9), a tantalum bypass capacitor on the +15 rail had gone bad; removing brought the +15 rail resistance to ground back to where it should be. Most of the capacitors look

to the electrostatic There are no such capacitors in the 453. Hence my comment regarding the primary capacitive coupling to the shield. I - er - looked at the schematic before I commented :-) Craig

Tantalums are really good when used properly. 1) ESR / ripple current rating MUST not be exceeded, creates internal self heating that will lead to internal shorts. 2) Use them for high frequency, low

As pointed out by others, there are times and places when (at least you think) you need to make a floating measurement (independent of the local ground.) I’ve done this with mapping sonars that are

Agree with Jeff for 422 AC, just look around hardware and you might find one to fit without trimming. I trimmed a couple extension cords for mine.

A hot chassis can also be caused by RF filter capacitors connected from each side of the line to the chassis. I would be much more suspicious of these if they exist in the 453 than of the

Hi all, I acquired a 453 in the spring, which had the ground lug sawed off!? This must surely be a "thing"... I replaced the cord. Phil

One time I picked up a pallet of 465s from an industrial repair service. All of them had the ground pin cut off. Paul -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems

To get rid of interference loops. If two or more grounded instruments are connected together via a signal cable, the resulting loop picks up mains frequency interference (or double frequency - 100Hz

On Wed, Aug 15, 2018 at 03:04 AM, F4GNY wrote: > > Hello Graig, > > > Just done, yes its strange ?? > > Does something can explain such this action ? > > Thank > > Regards > > Alain > > > > > Le

Hello Graig, Just done, yes its strange ?? Does something can explain such this action ? Thank Regards Alain

That would be typical if the chassis is ungrounded. Capacitance between the primary and shield (which is connected to the chassis) in the mains transformer will cause this. First thing to do is