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I believe it's the stiffness, more than the mass, that's important, but the problem remains that the electroscope needs to be sensitive to extremely small forces. A galvanometer will tell you the

Mark, I checked those and one of them is well within tolerance. The other one is just at the high end of its tolerance. I may replace one or both of them but they should be okay for now. Thanks! Barry

Barry, These are a bleeder for the cathode circuit and partial divider for high voltage and focus circuit. I replaced mine with 1W 1% types and spaced them off the board. The 1W types I use are about

Without looking, that sounds like the typical "focus string" divider that probably includes the focus pot somewhere, to get the right operating voltage for the function, and it possibly does other

Hi All, I've a TM504 with 4 modules for sale. Also a Scopemobile Type 204. The TM504 tucks nicely into the 204. Both can be seen here:

In my latest 7704A, I noticed the chain of nine 300K resistors (R4261 - R4277 and, possibly, R4279) in the CRT circuit have drifted significantly high (~20%) making what should be a total of 2.7M

I'm doing some work with interfaces & doing some research on the test equipment & interfacing. I'm interested in both serial & parallel & the various types of test equipment, breakout boxes, line

Should have mentioned, these are Tek scopes.

I should have mentioned - if you use a simple LED deal, use a different color for each direction. The signal will be brief, and it's easier to discern which color flashed, than which of two same ones

When one object dumps charge to another with enough energy to make a spark, then you don't need any sophisticated instruments to tell the polarity. A couple of anti-parallel-connected LEDs will

Gold leaf is the standard for electroscopes because it can be beaten far thinner than other metals. It has been the standard for leaf electroscopes since British physicist Abrahm Bennett used it in

Hello, I and a friend changed out the batteries in my newly purchased 2712 today. The GPIB battery was totally dead on an unloaded meter... The other battery had 3.xx left. Both batteries were swapped

Hmm... anything less rare? Anything I could take with me on the go? <bridgewaterma@...> wrote:

Aluminum foil is far too thick. An electroscope needs minimum mass, and that means leaf, not foil. The repulsive force in an electroscope is far too low for foil to work. For detecting direction of

Looking for a nice crack free front cover for the 465/475 scopes with DM44 or the 468. Thanks.

Hair on the wheels and some plastic of the wheels rubbing together generate lots of ES charge. Sort of like a van de graaff generator.

OK, so looking into it, a gold leaf electroscope will detect the presence of _a charge_, but what i want is to figure out the _sign_ of the current when an item is discharging into another item. I

Hi, I'm looking for a Keithley 2000 motherboard. Mine has some broken PCB tracks but I can't fix it. The PCB is multilayer. Thanks if anyone can help me. Mauirzio

Is anyone looking for a 575? I have two spares and need the room. PM if interested. I am in Kentucky. ThanksJeff Kruth

Hi, I'm looking for a Keithley 2000 motherboard. Mine has some broken PCB tracks but I can't fix it. Thanks if anyone can help me. Mauirzio