Bias probe zero

A scanning tunneling microscope STM is a type of microscope used for imaging surfaces at the atomic level. STM is based on the concept of quantum tunneling. When the tip is brought very near to the surface to be examined, a bias voltage applied between the two allows electrons to tunnel through the vacuum separating them. The resulting tunneling current is a function of the tip position, applied voltage, and the local density of states LDOS of the sample.

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Content:

• bias probes educate me please!!
• Scanning tunneling microscope
• The Columbia University High-Beta Tokamak
• The Black Magic of Setting the Bias make your amp sound its best
• low ouput DRRI: bias probe reads zero on one 6v6 only
• El84 Bias Probe
• Zero Plate Current when biasing
• Welcome To the Hoffman Amplifiers Forum
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WATCH RELATED VIDEO: Analog Meter For The Vacuum Tube Bias Probe

bias probes educate me please!!

Welcome, Guest. Please login or register. Home Help Search Login Register. Pages: [ 1 ] Go Down. Author Topic: help sourcing cathode bias probe resistors please Read times. I recently got 2 bias probes that adapt between the EL34s and the tube sockets- these alow to measure actual milliamps.

This is interesting method but more problematic because mA meters that resolve to 0. BTW, so far, I really like this meter- huge readouts and I can configure the backlight to stay on rather than auto time-out So I decide to cross check the mA readings I'm getting by also checking using the cathode resistor method- and I get large variations.

I am also going to cross check the Fluke 15B mA readings with my Fluke 88 when I replace the blown fuse in it. It never occured that resistors could be so far off assuming that's the problem.

Nor do I know if I can rely on Ohm readings in the 0. I AM seeing values around 1. So, I want to replace the 1 Ohm cathode resistors because it's possible that I didn't get good enough quality or tolerance resistors when I originally installed them. I'm not sure it matters, but what type is preferable? Metal oxide, flameproof, etc.? Easy source? Best brands? Thanks, Kip The need for utmost precision is more a perception than an absolute requirement.

Note Doug's instructions on the page I quoted. If you don't zero out your meter, your readings may be skewed. Also, if you use different meters; or the same meter: set for volts for one reading; current for another reading, you may find that the meter disagrees with itself.

You should also control the voltage into the amp under test with a variac to always put, say, VAC into your amp. JJ pointed out the high points and why; Quote.

Willabe Global Moderator Level 5 Posts: Quote from: Sponger D on September 25, , am. Quote from: jjasilli on September 25, , pm. Go here and read this post first, then post your problems in the forum - Click here.

I assume you mean Ohms and difficulties at 0 to 1 Ohm accuracies. I will research this and see if there are any options on my meters. My Fluke 88 never reads less that 0.

Looks like Willabe is addressing this. Thanks so much for your answers. Just getting into this forum. Looks like EL34 World is great for this Connect your leads together. When the display settles push the relative button. Quote from: sluckey on September 25, , pm. Quote from: Sponger D on September 27, , am. Quote from: sluckey on September 27, , am. How to measure 1 ohm, per the Tone Lizard: " How can you be sure your 1-ohm resistors are exactly 1-ohm?

With regard to measurements you're talking about both precision AND repeatability. For that you need to eliminate variables, such as inherent meter discrepancies; different wall voltages into the amp. One reason is the tubes. Another reason is that as resistors and coils become warmer, their resistance rises, thereby changing voltages and currents.

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Scanning tunneling microscope

Warning: The adjustments and processes described in this article require interacting with dangerous levels of voltage. Even unplugged, an amplifier can retain dangerous levels of charge. We encourage you to take extreme precautions when performing these adjustments or interacting with your amplifier. When in doubt, seek the help of a trained professional. You can follow this process with our companion video on how to bias your amplifier here:.

The Columbia University High-Beta Tokamak

Never the less I got several good shots. The data is being analyzed. Regards, Mikhail Wednesday December 18 05 32 FB setup shots Developed a "long lived" saturated RWM target mode that lasts about 2 to sometimes even 3 ms near the end of the shot. The shots typically disrupted at about 8 to 9ms see shot as an example. Feedback next. Thursday December 19 05 38 ICRH Disappointingly, the large oscillations on the loop voltage now appear not to be related to the plasma after all. Today, in contrast to last week, the oscillation was there even in the absence of plasma. Last week we had one shot, , without plasma, and the loop voltage oscillation was absent. However, today, we took several non-plasma shots, with and without banks firing, , , , where the loop voltage clearly oscillated during the RF.

The Black Magic of Setting the Bias make your amp sound its best

Either your web browser doesn't support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. The use of a Langmuir probe system in two GEC cells is reviewed. The major problems associated with probe diagnostics in a GEC cell are outlined and discussed. While the data base is still insufficient to give definitive values for many parameters, a number of standard measurements are put forward.

low ouput DRRI: bias probe reads zero on one 6v6 only

A theoretical and experimental study was developed about the applicability of a double probe system consisting of two directional Langmuir probes, both probes being located separately in a plasma column. The current- voltage characteristic of the double probe was obtained considering a plasma with a drifting maxwellian electron velocity distribution function and stationary ion background. In deriving the characteristic of the double probe, the plasma parameters, namely, electron temperature Te , electron density Ne , electron drift velocity Vde and plasma potential Vp are assumed to be non-uniform. The double probe characteristic is also dependent on the angle between the axial direction of the electron drift and the normal to the collecting area of the probe. Each probe can be rotated such that this angle can be varied between zero and degrees.

El84 Bias Probe

Any man worth his salt can fix almost any problem with this stuff alone. But don't go poking inside a valve amp unless you really know what you are doing as there's some mighty high voltages in there.. Until i get to learn a bit more about the inner workings of my amps, this was christmas cash well spent! Howdy, Stranger! It looks like you're new here. If you want to get involved, click one of these buttons! Sign In Register.

Zero Plate Current when biasing

There is a lot of discussion on the black magic of setting the bias on the output valves in your amp. This is also related to the matching of the valves. I am attempting to write this so as the musicians can understand and so the idea is that I make it hopefully simple to understand.

Welcome To the Hoffman Amplifiers Forum

RELATED VIDEO: Vacuum Tube Bias Probe To Measure Plate, Screen \u0026 Cathode Current

Several versions of the dot probe detection task are frequently used to assess maladaptive attentional processes associated with a broad range of psychopathology and health behavior, including eating behavior and weight. However, there are serious concerns about the reliability of the indices derived from the paradigm as measurement of attentional bias toward or away from salient stimuli. The present paper gives an overview of different attentional bias indices used in psychopathology research and scrutinizes three types of indices the traditional attentional bias score, the dynamic trial-level base scores, and the probability index calculated from a pictorial version of the dot probe task to assess food-related attentional biases in children and youngsters with and without obesity. Correlational analyses reveal that dynamic scores but not the traditional and probability indices are dependent on general response speed. Reliability estimates are low for the traditional and probability indices.

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Welcome, Guest. Please login or register. Home Help Search Login Register. Pages: [ 1 ] Go Down. Author Topic: help sourcing cathode bias probe resistors please Read times. I recently got 2 bias probes that adapt between the EL34s and the tube sockets- these alow to measure actual milliamps.

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