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Junior Varsity
A&H QU info leaked a day early
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<blockquote data-quote="Scott Bolt" data-source="post: 88768" data-attributes="member: 3950"><p>Re: A&H QU info leaked a day early</p><p></p><p></p><p></p><p>Thanks for the reply John,</p><p></p><p>Load dump is a longer transient designed to drain off a voltage offset presented by an isolated device being connected to the circuit. I work in automotive, so this is really an issue. A car traveling through dry air on rubber tires can create quite a capacitive charge. All the electronics within the vehicle reference the chassis ground, so it doesn't matter that the chassis ground is actually +100V from earth ground ..... until you connect a piece of diagnostic gear (which I design) that is plugged into a wall earth ground. These transients tend to be lower voltage, but much higher energy. They also tend to wreak havoc with your ground for a few milliseconds.</p><p></p><p>ESD is typically using the human body model of capacitance .... so really just the energy that you can store on your body while wearing rubber shoes <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> These transients are faster and very high voltage.</p><p></p><p>Sometimes the handling of chips can cause issues because the chips are not hooked up in circuit and presents quite a few unusual discharge cases that aren't really possible (or likely) when in circuit.</p><p></p><p>Our lab has a discharge plate when you enter, wrist grounding straps, and connections to every table for work on circuits .... all to keep this from happening as we build very expensive prototypes. It is a great time saver since trying to figure out that you broke a chip while handling a board really stinks <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>On the Qu16, it looks to me like it is a much better option for many people than the Expression si because of the integrated ability to record and playback directly from USB built in. The Expression Si requires a MADI card that is not included and appears to run around 1K.</p></blockquote><p></p>
[QUOTE="Scott Bolt, post: 88768, member: 3950"] Re: A&H QU info leaked a day early Thanks for the reply John, Load dump is a longer transient designed to drain off a voltage offset presented by an isolated device being connected to the circuit. I work in automotive, so this is really an issue. A car traveling through dry air on rubber tires can create quite a capacitive charge. All the electronics within the vehicle reference the chassis ground, so it doesn't matter that the chassis ground is actually +100V from earth ground ..... until you connect a piece of diagnostic gear (which I design) that is plugged into a wall earth ground. These transients tend to be lower voltage, but much higher energy. They also tend to wreak havoc with your ground for a few milliseconds. ESD is typically using the human body model of capacitance .... so really just the energy that you can store on your body while wearing rubber shoes ;) These transients are faster and very high voltage. Sometimes the handling of chips can cause issues because the chips are not hooked up in circuit and presents quite a few unusual discharge cases that aren't really possible (or likely) when in circuit. Our lab has a discharge plate when you enter, wrist grounding straps, and connections to every table for work on circuits .... all to keep this from happening as we build very expensive prototypes. It is a great time saver since trying to figure out that you broke a chip while handling a board really stinks :) On the Qu16, it looks to me like it is a much better option for many people than the Expression si because of the integrated ability to record and playback directly from USB built in. The Expression Si requires a MADI card that is not included and appears to run around 1K. [/QUOTE]
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A&H QU info leaked a day early
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