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PH Value Measurement

02:59,

2008-04-17 12:27:34

Description: pH Value Measurement

Channel: metacafe

Tags: PH Value Measurement Science Sites Experiments Patents

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Girth Measurement

01:32,

2008-05-17 06:41:42

Description: Short demonstration of Girth Measurement

Channel: youtube

Tags: Measurement Timber

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USGS Flow Measurement With Hanna and Fletcher

02:29,

2008-07-17 00:36:23

Description: USGS streamgagers make a streamflow measurement from a bridge on the Santa Cruz River in Arizona.

Channel: youtube

Tags: Bridge Cruz Fletcher Measurement Monsoon River Santa streamflow USGS

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Snubber Measurement

27,

03:45,

2008-04-21 18:55:43

Description: Snubber Measurement. Part of a series of videos on the design of snubber circuits for power electronics by Rudy Severns. Hello. You know there's a lot of work can be done with simulation, but (More) Snubber Measurement. Part of a series of videos on the design of snubber circuits for power electronics by Rudy Severns. Hello. You know there's a lot of work can be done with simulation, but ultimately it's truth on the ground, in other words, the actual circuit that really matters. So when you've done your modeling and your calculations and you're ready to really find out if your snubber circuits work, then you have to be able to go and make measurements. Of course, actually, initially, you have to start with measurements to understand what you need in the way of snubber, in other words, what's your problem? What is the circuit doing that you don't like? That's where you start and there you will use voltage probes, but also current probes. Once you have the basic information, you go back to the simulation, do your design work, and you come back to the laboratory and put in your modifications and see just how close are they. Are they good enough or do we need to make some adjustments? The key item is to look very critically at your waveforms. Understand on your waveforms what every wiggle is about. Do you want that wiggle or don't you? The key is to understand what is causing the wiggle, because if you want to eliminate it, then you have to know what's causing it. There are two basic tools that go with an oscilloscope for checking and understanding the waveforms. The first of course is a voltage probe. And you can see we can connect this one in right here. We turn on our power supply and we can get some of the waveforms, the voltage waveforms that are in there. But also, there's a more critical item. It turns out that you not only want to look at the voltage waveforms, but you want to look at the current waveforms. And there are of course many types of current probes. The simplest, you can put a resistor in, a series resistor, in the path you want to measure, and then measure either unbalanced or in a balanced way with voltage probes to determine what the current is at a given point. And then of course, if you're a little more elegant, you can use various forms of current probes. This example happens to be an AC current probe which is useful, but there are also DC current probes that will allow you to see both the AC and the DC components. In power supplies, very often you do want to see what is the AC component floating on - a DC component - for example: output filters, input currents, things of that nature. So these are two fundamental tools. Now, with voltage probes it's not very hard to clip them various places in the circuit. But current probes you have to be a little more clever. You have to put some loops in usually. Usually you have to actually interrupt the circuit and put a loop in there. And you have to be a little careful of course. That loop will introduce some parasitic inductance and it may modify things a little. Also, there's the capacitance of the probe itself, the voltage probe. So normally you'd run the voltage probe on high attenuation to minimize its capacitance. These are just basic ideas to gather the information you need to design your snubber circuit and then in the end, to verify that the snubber really works. Rudy Severns' book "Snubber Circuits for Power Electronics" is available for purchase on the Internet as an ebook in PDF format at WWW.SNUBBERDESIGN.COM (Less)

Channel: youtube

Tags: design electronics measurement power snubber supply

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C20 Interview w/ Social Media Measurement Guru, Kati...

07:13,

2008-06-06 07:04:03

Description: Aaron Strout and social media measurement guru, Katie Paine, talk about the Community 2.0 Conference, the importance of "WE" and how companies can think about measuring social media. (More)

Channel: youtube

Tags: 2.0 community Katie measurement media Paine social

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How to Build an HHO Gas Output Measurement Device

03:56,

2008-06-06 16:41:16

Description: This video shows how to build an HHO Gas Output Measurement Device. Instead of talking in "bubbles" this device will allow you to measure a real quantity of gas that your cell is producing. (More)

Channel: youtube

Tags: cell device fuel gas hho hydrogen measurement output power water wfc

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Mepos Project - Wooden panel measurement b/w

12,

00:07,

2008-04-02 07:10:55

Description: Vision system for 3D reconstruction and measurement of wooden panels in a sanding machine

Channel: youtube

Tags: Computer vision 3D reconstruction measurement

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Network Rail Measurement train

00:41,

2008-03-29 07:07:06

Description: Network mail HST measurement train passes through Derby station on the morning of June 14th 2007

Channel: youtube

Tags: Derby HST measurement network Rail train trains

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New Measurement Train - Old Power

15,

00:25,

2007-09-26 04:50:29

Description: 'New Measurement Train' passing St. Alkmunds footbridge at Duffield.Being pulled by an ancient Brush Type 2 / Class 31. Not surprising as the front power car was smoking the day before (More)

Channel: youtube

Tags: 31 brush class duffield measurement new train

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Grade 3 Measurement Final Project

03:13,

2008-06-16 03:19:27

Description: Building towers for Measurement Village

Channel: youtube

Tags: measurement

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Leica Disto A8-Taking a Measurement

00:44,

2008-06-23 12:38:54

Description: EngineerSupply is proud to present this video from Leica on how to use the Leica Disto A8. This video covers how to take a standard measurement with the Leica A8. EngineerSupply is a Factory (More)

Channel: youtube

Tags: A8 calculate Distance Disto EngineerSupply estimate laser Leica measureing measurement Measurers tape

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Overhang Objects Detection and Measurement

01:38,

2008-07-06 07:58:26

Description: Overhang Objects Detection and Measurement for highway asset management, mapping and street level imaging. Very fast (100 fps), accurate and robust.

Channel: youtube

Tags: and asset Detection highway imaging level management mapping Measurement Objects Overhang street

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Overhang Objects Detection and Measurement

01:38,

2008-07-06 09:50:09

Description: Overhang Objects Detection and Measurement for highway asset management, mapping and street level imaging. Very fast (100 fps), accurate and robust.

Channel: veoh

Tags: and objects overhang measurement detection

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USGS Historic Flood Measurement on the Verde River

05:06,

2008-07-10 00:56:55

Description: USGS streamgagers make a cableway measurement at Verde River below Tangle Creek during the 1993 flood in Arizona.

Channel: youtube

Tags: Arizona Flood measurement River USGS Verde

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CSS Measurement

06:11,

2008-04-21 20:04:37

Description: http://ogsolution.com - In this screencast, we are going to talk about some common CSS measurement units. As you start setting up CSS rules for HTML, you will start setting sizes for font sizes, width (More)

Channel: youtube

Tags: cast css language measurement screen web

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