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Many fans can be given extra life by adding a few drops of light oil on the bearing. Unless the fan winding is burnt out, this method of restoration works well. ?Just carefully peel off the round

Resistors utilized in metering or other circuits that require good precision is why manufacturers either select their components or rely upon custom made products to their specifications instead of

parkertest is an ebay username. Search for HP 8481A on ebay and you'll find listings for both repairing 8481As and for refurb units. Orin. wrote:

Google shows it in Placerville, California, USA.Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

What is (where is) a "parkertest?" Is there a link to the actual page where (parkertest + Parker Test + Bruce Parker + Parker Test Equipment) quotes < 500 USD, to repair an H.P. power sensor? It's

When measuring high value resistors like these you need to be aware of the accuracy limitations of the 3456A on the higher resistance ranges. If you are trying to verify that your resistors are within

I'm pretty sure I'm going to go with what I have and see whether the meter will calibrate. We'll see. Thanks, Barry - N4BUQ

Hello all, I've just ordered the brass gears from the eBay fellow in India.? Many thanks to all who presented the gear information. While waiting, I need to replace my noisy fan in my 8640B. From the

I had HaySeed Hamfest make 3 multi value electrolytic caps for an old HP voltmeter. They were not cheap but they sure are pretty.

What are the specs of the meter? Generally the divider has to be considerably more accurate than the overall meter specs. Its possible you are worrying about an error that doesn't really matter. ??

The drift in carbon comp resistors can happen just sitting around. Depends on how much heat and moisture they are subject to, especially moisture. The AB/Ohmite resistors seem to be pretty stable with

Its possible to measure the two in series and in parallel but series puts it in the next higher range of the meter with lower precision. Parallel also results in values which are on the edge of the

When measuring such high resistance, alternate current/leakage paths come into play.? A guarded measurement is a good way to reduce such problems. However, since your readings are high, it makes me

I can tell you from experience that while the 3456A is great, it can give false readings if the power supplies aren't spot on.? Back when I only had one of them, I was working on a precision voltage

The 90M is the last resistor in the chain for the X10M OHMS range of a VTVM (a Technology Instrument Corporation (aka Acton) 800A). The 50M is part of the input resistive divider for ACV and DCV

I'm not selling anything. Consider that the 11683A option H01 has a modified 8481A with its sensor replaced with a 196 ohm resistor. This is fed by a 196 K resistor that is either connected to the

My only experience with this is of a LARGE change in value, of a screen-grid resistor. Does this actually happen with a resistor that is not in use? --doug, WA2SAY

I think you need to watch out on the high resistance ranges of the 3456A, I believe the quoted accuracy is noticeably worse above 10M, for instance, if you look at p1-5 of the operation manual you'll

Sounds like since you cant trust the calibration since it is not current that this is all within the range of uncertainty I am pretty sure that Mouser and Digikey do not actually measure the value of

Not if they are metal film resistors, those are very stable both for age and temperature. The error is almost certainly not from either. I agree that contamination will make the value go down,